diff --git a/doc/source/reporters.rst b/doc/source/reporters.rst
index e3ab947..dd053fa 100644
--- a/doc/source/reporters.rst
+++ b/doc/source/reporters.rst
@@ -44,6 +44,10 @@
   set as the commit status on github.
   ``status: 'success'``
 
+  **status-url**
+  String value for a link url to set in the github status. Defaults to the zuul
+  server status_url, or the empty string if that is unset.
+
   **comment**
   Boolean value (``true`` or ``false``) that determines if the reporter should
   add a comment to the pipeline status to the github pull request. Defaults
diff --git a/doc/source/zuul.rst b/doc/source/zuul.rst
index 56cc6a8..a7dfb44 100644
--- a/doc/source/zuul.rst
+++ b/doc/source/zuul.rst
@@ -108,6 +108,10 @@
   commands.
   ``state_dir=/var/lib/zuul``
 
+**jobroot_dir**
+  Path to directory that Zuul should store temporary job files.
+  ``jobroot_dir=/tmp``
+
 **report_times**
   Boolean value (``true`` or ``false``) that determines if Zuul should
   include elapsed times for each job in the textual report.  Used by
@@ -165,6 +169,33 @@
   Path to PID lock file for the merger process.
   ``pidfile=/var/run/zuul-merger/merger.pid``
 
+executor
+""""""""
+
+The zuul-executor process configuration.
+
+**finger_port**
+  Port to use for finger log streamer.
+  ``finger_port=79``
+
+**git_dir**
+  Directory that Zuul should clone local git repositories to.
+  ``git_dir=/var/lib/zuul/git``
+
+**log_config**
+  Path to log config file for the executor process.
+  ``log_config=/etc/zuul/logging.yaml``
+
+**private_key_file**
+  SSH private key file to be used when logging into worker nodes.
+  ``private_key_file=~/.ssh/id_rsa``
+
+**user**
+  User ID for the zuul-executor process. In normal operation as a daemon,
+  the executor should be started as the ``root`` user, but it will drop
+  privileges to this user during startup.
+  ``user=zuul``
+
 .. _connection:
 
 connection ArbitraryName
diff --git a/etc/status/public_html/index.html b/etc/status/public_html/index.html
index ca5bb56..cc3d40a 100644
--- a/etc/status/public_html/index.html
+++ b/etc/status/public_html/index.html
@@ -30,8 +30,7 @@
     <script src="jquery.zuul.js"></script>
     <script src="zuul.app.js"></script>
     <script>
-        // @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt
-Apache 2.0
+        // @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt Apache 2.0
         zuul_build_dom(jQuery, '#zuul_container');
         zuul_start(jQuery);
 	// @license-end
diff --git a/requirements.txt b/requirements.txt
index e4f0212..746bbcb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,3 +23,6 @@
 sqlalchemy
 alembic
 cryptography>=1.6
+cachecontrol
+pyjwt
+iso8601
diff --git a/setup.cfg b/setup.cfg
index 9ee64f3..5ae0903 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -26,6 +26,7 @@
     zuul = zuul.cmd.client:main
     zuul-cloner = zuul.cmd.cloner:main
     zuul-executor = zuul.cmd.executor:main
+    zuul-bwrap = zuul.driver.bubblewrap:main
 
 [build_sphinx]
 source-dir = doc/source
diff --git a/tests/base.py b/tests/base.py
index 2bcd1ca..65ded50 100755
--- a/tests/base.py
+++ b/tests/base.py
@@ -565,6 +565,7 @@
         self.head_sha = None
         self.is_merged = False
         self.merge_message = None
+        self.state = 'open'
         self._createPRRef()
         self._addCommitToRepo(files=files)
         self._updateTimeStamp()
@@ -591,6 +592,21 @@
     def getPullRequestClosedEvent(self):
         return self._getPullRequestEvent('closed')
 
+    def getPushEvent(self, old_sha, ref='refs/heads/master'):
+        name = 'push'
+        data = {
+            'ref': ref,
+            'before': old_sha,
+            'after': self.head_sha,
+            'repository': {
+                'full_name': self.project
+            },
+            'sender': {
+                'login': 'ghuser'
+            }
+        }
+        return (name, data)
+
     def addComment(self, message):
         self.comments.append(message)
         self._updateTimeStamp()
@@ -921,6 +937,7 @@
                 'ref': pr.branch,
             },
             'mergeable': True,
+            'state': pr.state,
             'head': {
                 'sha': pr.head_sha,
                 'repo': {
@@ -994,8 +1011,12 @@
         owner, proj = project.split('/')
         for pr in self.pull_requests:
             pr_owner, pr_project = pr.project.split('/')
+            # This is somewhat risky, if the same commit exists in multiple
+            # PRs, we might grab the wrong one that doesn't have a status
+            # that is expected to be there. Maybe re-work this so that there
+            # is a global registry of commit statuses like with github.
             if (pr_owner == owner and pr_project == proj and
-                pr.head_sha == sha):
+                sha in pr.statuses):
                 return pr.statuses[sha]
 
     def setCommitStatus(self, project, sha, state,
@@ -1200,6 +1221,25 @@
         self.log.debug("  OK")
         return True
 
+    def getWorkspaceRepos(self, projects):
+        """Return workspace git repo objects for the listed projects
+
+        :arg list projects: A list of strings, each the canonical name
+                            of a project.
+
+        :returns: A dictionary of {name: repo} for every listed
+                  project.
+        :rtype: dict
+
+        """
+
+        repos = {}
+        for project in projects:
+            path = os.path.join(self.jobdir.src_root, project)
+            repo = git.Repo(path)
+            repos[project] = repo
+        return repos
+
 
 class RecordingExecutorServer(zuul.executor.server.ExecutorServer):
     """An Ansible executor to be used in tests.
@@ -1286,9 +1326,10 @@
 
 
 class RecordingAnsibleJob(zuul.executor.server.AnsibleJob):
-    def doMergeChanges(self, items):
+    def doMergeChanges(self, merger, items, repo_state):
         # Get a merger in order to update the repos involved in this job.
-        commit = super(RecordingAnsibleJob, self).doMergeChanges(items)
+        commit = super(RecordingAnsibleJob, self).doMergeChanges(
+            merger, items, repo_state)
         if not commit:  # merge conflict
             self.recordResult('MERGER_FAILURE')
         return commit
@@ -1384,9 +1425,9 @@
                 len(self.low_queue))
         self.log.debug("releasing queued job %s (%s)" % (regex, qlen))
         for job in self.getQueue():
-            if job.name != 'executor:execute':
+            if job.name != b'executor:execute':
                 continue
-            parameters = json.loads(job.arguments)
+            parameters = json.loads(job.arguments.decode('utf8'))
             if not regex or re.match(regex, parameters.get('job')):
                 self.log.debug("releasing queued job %s" %
                                job.unique)
@@ -1837,12 +1878,20 @@
 
         # Make per test copy of Configuration.
         self.setup_config()
+        self.private_key_file = os.path.join(self.test_root, 'test_id_rsa')
+        if not os.path.exists(self.private_key_file):
+            src_private_key_file = os.path.join(FIXTURE_DIR, 'test_id_rsa')
+            shutil.copy(src_private_key_file, self.private_key_file)
+            shutil.copy('{}.pub'.format(src_private_key_file),
+                        '{}.pub'.format(self.private_key_file))
+            os.chmod(self.private_key_file, 0o0600)
         self.config.set('zuul', 'tenant_config',
                         os.path.join(FIXTURE_DIR,
                                      self.config.get('zuul', 'tenant_config')))
         self.config.set('merger', 'git_dir', self.merger_src_root)
         self.config.set('executor', 'git_dir', self.executor_src_root)
         self.config.set('zuul', 'state_dir', self.state_root)
+        self.config.set('executor', 'private_key_file', self.private_key_file)
 
         self.statsd = FakeStatsd()
         # note, use 127.0.0.1 rather than localhost to avoid getting ipv6
@@ -2160,6 +2209,8 @@
 
     def shutdown(self):
         self.log.debug("Shutting down after tests")
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
         self.executor_client.stop()
         self.merge_client.stop()
         self.executor_server.stop()
@@ -2175,10 +2226,17 @@
         self.fake_nodepool.stop()
         self.zk.disconnect()
         self.printHistory()
-        # we whitelist watchdog threads as they have relatively long delays
+        # We whitelist watchdog threads as they have relatively long delays
         # before noticing they should exit, but they should exit on their own.
+        # Further the pydevd threads also need to be whitelisted so debugging
+        # e.g. in PyCharm is possible without breaking shutdown.
+        whitelist = ['executor-watchdog',
+                     'pydevd.CommandThread',
+                     'pydevd.Reader',
+                     'pydevd.Writer',
+                     ]
         threads = [t for t in threading.enumerate()
-                   if t.name != 'executor-watchdog']
+                   if t.name not in whitelist]
         if len(threads) > 1:
             log_str = ""
             for thread_id, stack_frame in sys._current_frames().items():
@@ -2279,7 +2337,8 @@
             # It hasn't been reported yet.
             return False
         # Make sure that none of the worker connections are in GRAB_WAIT
-        for connection in self.executor_server.worker.active_connections:
+        worker = self.executor_server.executor_worker
+        for connection in worker.active_connections:
             if connection.state == 'GRAB_WAIT':
                 return False
         return True
@@ -2631,6 +2690,29 @@
                 specified_conn.server == conn.server):
                 conn.addEvent(event)
 
+    def getUpstreamRepos(self, projects):
+        """Return upstream git repo objects for the listed projects
+
+        :arg list projects: A list of strings, each the canonical name
+                            of a project.
+
+        :returns: A dictionary of {name: repo} for every listed
+                  project.
+        :rtype: dict
+
+        """
+
+        repos = {}
+        for project in projects:
+            # FIXME(jeblair): the upstream root does not yet have a
+            # hostname component; that needs to be added, and this
+            # line removed:
+            tmp_project_name = '/'.join(project.split('/')[1:])
+            path = os.path.join(self.upstream_root, tmp_project_name)
+            repo = git.Repo(path)
+            repos[project] = repo
+        return repos
+
 
 class AnsibleZuulTestCase(ZuulTestCase):
     """ZuulTestCase but with an actual ansible executor running"""
diff --git a/tests/fixtures/config/ansible/git/common-config/playbooks/hello-post.yaml b/tests/fixtures/config/ansible/git/common-config/playbooks/hello-post.yaml
new file mode 100644
index 0000000..d528be1
--- /dev/null
+++ b/tests/fixtures/config/ansible/git/common-config/playbooks/hello-post.yaml
@@ -0,0 +1,12 @@
+- hosts: all
+  tasks:
+    - name: Register hello-world.txt file.
+      stat:
+        path: "{{zuul.executor.log_root}}/hello-world.txt"
+      register: st
+
+    - name: Assert hello-world.txt file.
+      assert:
+        that:
+          - st.stat.exists
+          - st.stat.isreg
diff --git a/tests/fixtures/config/ansible/git/common-config/zuul.yaml b/tests/fixtures/config/ansible/git/common-config/zuul.yaml
index f9be158..02b87bd 100644
--- a/tests/fixtures/config/ansible/git/common-config/zuul.yaml
+++ b/tests/fixtures/config/ansible/git/common-config/zuul.yaml
@@ -72,3 +72,7 @@
     nodes:
       - name: ubuntu-xenial
         image: ubuntu-xenial
+
+- job:
+    name: hello
+    post-run: hello-post
diff --git a/tests/fixtures/config/ansible/git/org_project/.zuul.yaml b/tests/fixtures/config/ansible/git/org_project/.zuul.yaml
index a2d9c6f..ca734c5 100644
--- a/tests/fixtures/config/ansible/git/org_project/.zuul.yaml
+++ b/tests/fixtures/config/ansible/git/org_project/.zuul.yaml
@@ -2,6 +2,10 @@
     parent: python27
     name: faillocal
 
+- job:
+    parent: hello
+    name: hello-world
+
 - project:
     name: org/project
     check:
@@ -10,3 +14,4 @@
         - faillocal
         - check-vars
         - timeout
+        - hello-world
diff --git a/tests/fixtures/config/ansible/git/org_project/playbooks/hello-world.yaml b/tests/fixtures/config/ansible/git/org_project/playbooks/hello-world.yaml
new file mode 100644
index 0000000..373de02
--- /dev/null
+++ b/tests/fixtures/config/ansible/git/org_project/playbooks/hello-world.yaml
@@ -0,0 +1,5 @@
+- hosts: all
+  tasks:
+    - copy:
+        content: "hello world"
+        dest: "{{zuul.executor.log_root}}/hello-world.txt"
diff --git a/tests/fixtures/config/openstack/git/project-config/zuul.yaml b/tests/fixtures/config/openstack/git/project-config/zuul.yaml
index 5d0c774..aff2046 100644
--- a/tests/fixtures/config/openstack/git/project-config/zuul.yaml
+++ b/tests/fixtures/config/openstack/git/project-config/zuul.yaml
@@ -66,7 +66,7 @@
 - job:
     name: dsvm
     parent: base
-    repos:
+    required-projects:
       - openstack/keystone
       - openstack/nova
 
diff --git a/tests/fixtures/config/push-reqs/git/common-config/playbooks/job1.yaml b/tests/fixtures/config/push-reqs/git/common-config/playbooks/job1.yaml
new file mode 100644
index 0000000..f679dce
--- /dev/null
+++ b/tests/fixtures/config/push-reqs/git/common-config/playbooks/job1.yaml
@@ -0,0 +1,2 @@
+- hosts: all
+  tasks: []
diff --git a/tests/fixtures/config/push-reqs/git/common-config/zuul.yaml b/tests/fixtures/config/push-reqs/git/common-config/zuul.yaml
new file mode 100644
index 0000000..6569966
--- /dev/null
+++ b/tests/fixtures/config/push-reqs/git/common-config/zuul.yaml
@@ -0,0 +1,119 @@
+- pipeline:
+    name: current
+    manager: independent
+    require:
+      github:
+        current-patchset: true
+      gerrit:
+        current-patchset: true
+    trigger:
+      github:
+        - event: push
+      gerrit:
+        - event: ref-updated
+
+- pipeline:
+    name: open
+    manager: independent
+    require:
+      github:
+        open: true
+      gerrit:
+        open: true
+    trigger:
+      github:
+        - event: push
+      gerrit:
+        - event: ref-updated
+
+- pipeline:
+    name: review
+    manager: independent
+    require:
+      github:
+        review:
+          - type: approval
+      gerrit:
+        approval:
+          - email: herp@derp.invalid
+    trigger:
+      github:
+        - event: push
+      gerrit:
+        - event: ref-updated
+
+- pipeline:
+    name: status
+    manager: independent
+    require:
+      github:
+        status: 'zuul:check:success'
+    trigger:
+      github:
+        - event: push
+
+- pipeline:
+    name: pushhub
+    manager: independent
+    require:
+      gerrit:
+        open: true
+    trigger:
+      github:
+        - event: push
+      gerrit:
+        - event: ref-updated
+
+- pipeline:
+    name: pushgerrit
+    manager: independent
+    require:
+      github:
+        open: true
+    trigger:
+      github:
+        - event: push
+      gerrit:
+        - event: ref-updated
+
+- job:
+    name: job1
+
+- project:
+    name: org/project1
+    current:
+      jobs:
+        - job1
+    open:
+      jobs:
+        - job1
+    review:
+      jobs:
+        - job1
+    status:
+      jobs:
+        - job1
+    pushhub:
+      jobs:
+        - job1
+    pushgerrit:
+      jobs:
+        - job1
+
+- project:
+    name: org/project2
+    current:
+      jobs:
+        - job1
+    open:
+      jobs:
+        - job1
+    review:
+      jobs:
+        - job1
+    pushhub:
+      jobs:
+        - job1
+    pushgerrit:
+      jobs:
+        - job1
diff --git a/tests/fixtures/config/push-reqs/git/org_project1/README b/tests/fixtures/config/push-reqs/git/org_project1/README
new file mode 100644
index 0000000..9daeafb
--- /dev/null
+++ b/tests/fixtures/config/push-reqs/git/org_project1/README
@@ -0,0 +1 @@
+test
diff --git a/tests/fixtures/config/push-reqs/git/org_project2/README b/tests/fixtures/config/push-reqs/git/org_project2/README
new file mode 100644
index 0000000..9daeafb
--- /dev/null
+++ b/tests/fixtures/config/push-reqs/git/org_project2/README
@@ -0,0 +1 @@
+test
diff --git a/tests/fixtures/config/push-reqs/main.yaml b/tests/fixtures/config/push-reqs/main.yaml
new file mode 100644
index 0000000..d9f1a42
--- /dev/null
+++ b/tests/fixtures/config/push-reqs/main.yaml
@@ -0,0 +1,11 @@
+- tenant:
+    name: tenant-one
+    source:
+      github:
+        config-projects:
+          - common-config
+        untrusted-projects:
+          - org/project1
+      gerrit:
+        untrusted-projects:
+          - org/project2
diff --git a/tests/fixtures/config/zuul-connections-multiple-gerrits/git/common-config/zuul.yaml b/tests/fixtures/config/zuul-connections-multiple-gerrits/git/common-config/zuul.yaml
index 961ff06..8f858cd 100644
--- a/tests/fixtures/config/zuul-connections-multiple-gerrits/git/common-config/zuul.yaml
+++ b/tests/fixtures/config/zuul-connections-multiple-gerrits/git/common-config/zuul.yaml
@@ -24,6 +24,25 @@
       another_gerrit:
         verified: -1
 
+- pipeline:
+    name: common_check
+    manager: independent
+    trigger:
+      another_gerrit:
+        - event: patchset-created
+      review_gerrit:
+        - event: patchset-created
+    success:
+      review_gerrit:
+        verified: 1
+      another_gerrit:
+        verified: 1
+    failure:
+      review_gerrit:
+        verified: -1
+      another_gerrit:
+        verified: -1
+
 - job:
     name: project-test1
 
@@ -41,3 +60,16 @@
     another_check:
       jobs:
         - project-test2
+
+
+- project:
+    name: review.example.com/org/project2
+    common_check:
+      jobs:
+        - project-test1
+
+- project:
+    name: another.example.com/org/project2
+    common_check:
+      jobs:
+        - project-test2
diff --git a/tests/fixtures/config/zuul-connections-multiple-gerrits/git/org_project2/README b/tests/fixtures/config/zuul-connections-multiple-gerrits/git/org_project2/README
new file mode 100644
index 0000000..9daeafb
--- /dev/null
+++ b/tests/fixtures/config/zuul-connections-multiple-gerrits/git/org_project2/README
@@ -0,0 +1 @@
+test
diff --git a/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml b/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml
index f5bff21..38810fd 100644
--- a/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml
+++ b/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml
@@ -6,6 +6,8 @@
           - common-config
         untrusted-projects:
           - org/project1
+          - org/project2
       another_gerrit:
         untrusted-projects:
           - org/project1
+          - org/project2
diff --git a/tests/fixtures/layouts/repo-checkout-four-project.yaml b/tests/fixtures/layouts/repo-checkout-four-project.yaml
new file mode 100644
index 0000000..392931a
--- /dev/null
+++ b/tests/fixtures/layouts/repo-checkout-four-project.yaml
@@ -0,0 +1,81 @@
+- pipeline:
+    name: check
+    manager: independent
+    trigger:
+      gerrit:
+        - event: patchset-created
+    success:
+      gerrit:
+        verified: 1
+    failure:
+      gerrit:
+        verified: -1
+
+- pipeline:
+    name: gate
+    manager: dependent
+    success-message: Build succeeded (gate).
+    trigger:
+      gerrit:
+        - event: comment-added
+          approval:
+            - approved: 1
+    success:
+      gerrit:
+        verified: 2
+        submit: true
+    failure:
+      gerrit:
+        verified: -2
+    start:
+      gerrit:
+        verified: 0
+    precedence: high
+
+- job:
+    name: integration
+    required-projects:
+      - org/project1
+      - org/project2
+      - org/project3
+      - org/project4
+
+- project:
+    name: org/project1
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project2
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project3
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project4
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
diff --git a/tests/fixtures/layouts/repo-checkout-no-timer.yaml b/tests/fixtures/layouts/repo-checkout-no-timer.yaml
new file mode 100644
index 0000000..2b65850
--- /dev/null
+++ b/tests/fixtures/layouts/repo-checkout-no-timer.yaml
@@ -0,0 +1,20 @@
+- pipeline:
+    name: periodic
+    manager: independent
+    # Trigger is required, set it to one that is a noop
+    # during tests that check the timer trigger.
+    trigger:
+      gerrit:
+        - event: ref-updated
+
+- job:
+    name: integration
+    override-branch: stable/havana
+    required-projects:
+      - org/project1
+
+- project:
+    name: org/project1
+    periodic:
+      jobs:
+        - integration
diff --git a/tests/fixtures/layouts/repo-checkout-post.yaml b/tests/fixtures/layouts/repo-checkout-post.yaml
new file mode 100644
index 0000000..9698289
--- /dev/null
+++ b/tests/fixtures/layouts/repo-checkout-post.yaml
@@ -0,0 +1,25 @@
+- pipeline:
+    name: post
+    manager: independent
+    trigger:
+      gerrit:
+        - event: ref-updated
+          ref: ^(?!refs/).*$
+
+- job:
+    name: integration
+    required-projects:
+      - org/project1
+      - org/project2
+
+- project:
+    name: org/project1
+    post:
+      jobs:
+        - integration
+
+- project:
+    name: org/project2
+    post:
+      jobs:
+        - integration
diff --git a/tests/fixtures/layouts/repo-checkout-six-project.yaml b/tests/fixtures/layouts/repo-checkout-six-project.yaml
new file mode 100644
index 0000000..93a64ea
--- /dev/null
+++ b/tests/fixtures/layouts/repo-checkout-six-project.yaml
@@ -0,0 +1,104 @@
+- pipeline:
+    name: check
+    manager: independent
+    trigger:
+      gerrit:
+        - event: patchset-created
+    success:
+      gerrit:
+        verified: 1
+    failure:
+      gerrit:
+        verified: -1
+
+- pipeline:
+    name: gate
+    manager: dependent
+    success-message: Build succeeded (gate).
+    trigger:
+      gerrit:
+        - event: comment-added
+          approval:
+            - approved: 1
+    success:
+      gerrit:
+        verified: 2
+        submit: true
+    failure:
+      gerrit:
+        verified: -2
+    start:
+      gerrit:
+        verified: 0
+    precedence: high
+
+- job:
+    name: integration
+    required-projects:
+      - org/project1
+      - org/project2
+      - org/project3
+      - name: org/project4
+        override-branch: master
+      - org/project5
+      - org/project6
+
+- project:
+    name: org/project1
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project2
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project3
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project4
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project5
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project6
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
diff --git a/tests/fixtures/layouts/repo-checkout-timer.yaml b/tests/fixtures/layouts/repo-checkout-timer.yaml
new file mode 100644
index 0000000..d5917d1
--- /dev/null
+++ b/tests/fixtures/layouts/repo-checkout-timer.yaml
@@ -0,0 +1,18 @@
+- pipeline:
+    name: periodic
+    manager: independent
+    trigger:
+      timer:
+        - time: '* * * * * */1'
+
+- job:
+    name: integration
+    override-branch: stable/havana
+    required-projects:
+      - org/project1
+
+- project:
+    name: org/project1
+    periodic:
+      jobs:
+        - integration
diff --git a/tests/fixtures/layouts/repo-checkout-two-project.yaml b/tests/fixtures/layouts/repo-checkout-two-project.yaml
new file mode 100644
index 0000000..239d80c
--- /dev/null
+++ b/tests/fixtures/layouts/repo-checkout-two-project.yaml
@@ -0,0 +1,59 @@
+- pipeline:
+    name: check
+    manager: independent
+    trigger:
+      gerrit:
+        - event: patchset-created
+    success:
+      gerrit:
+        verified: 1
+    failure:
+      gerrit:
+        verified: -1
+
+- pipeline:
+    name: gate
+    manager: dependent
+    success-message: Build succeeded (gate).
+    trigger:
+      gerrit:
+        - event: comment-added
+          approval:
+            - approved: 1
+    success:
+      gerrit:
+        verified: 2
+        submit: true
+    failure:
+      gerrit:
+        verified: -2
+    start:
+      gerrit:
+        verified: 0
+    precedence: high
+
+- job:
+    name: integration
+    required-projects:
+      - org/project1
+      - org/project2
+
+- project:
+    name: org/project1
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
+
+- project:
+    name: org/project2
+    check:
+      jobs:
+        - integration
+    gate:
+      queue: integrated
+      jobs:
+        - integration
diff --git a/tests/fixtures/layouts/reporting-github.yaml b/tests/fixtures/layouts/reporting-github.yaml
index c939f39..8dd35b0 100644
--- a/tests/fixtures/layouts/reporting-github.yaml
+++ b/tests/fixtures/layouts/reporting-github.yaml
@@ -29,6 +29,7 @@
       github:
         comment: false
         status: 'success'
+        status-url: http://logs.example.com/{pipeline.name}/{change.project}/{change.number}/{change.patchset}/
     failure:
       github:
         comment: false
diff --git a/tests/fixtures/layouts/requirements-github.yaml b/tests/fixtures/layouts/requirements-github.yaml
index 5b92b58..9933f27 100644
--- a/tests/fixtures/layouts/requirements-github.yaml
+++ b/tests/fixtures/layouts/requirements-github.yaml
@@ -14,6 +14,19 @@
         comment: true
 
 - pipeline:
+    name: trigger_status
+    manager: independent
+    trigger:
+      github:
+        - event: pull_request
+          action: comment
+          comment: 'trigger me'
+          require-status: "zuul:check:success"
+    success:
+      github:
+        comment: true
+
+- pipeline:
     name: trigger
     manager: independent
     trigger:
@@ -126,6 +139,35 @@
       github:
         comment: true
 
+- pipeline:
+    name: require_open
+    manager: independent
+    require:
+      github:
+        open: true
+    trigger:
+      github:
+        - event: pull_request
+          action: comment
+          comment: 'test me'
+    success:
+      github:
+        comment: true
+
+- pipeline:
+    name: require_current
+    manager: independent
+    require:
+      github:
+        current-patchset: true
+    trigger:
+      github:
+        - event: pull_request
+          action: changed
+    success:
+      github:
+        comment: true
+
 - job:
     name: project1-pipeline
 - job:
@@ -140,12 +182,19 @@
     name: project6-newerthan
 - job:
     name: project7-olderthan
+- job:
+    name: project8-requireopen
+- job:
+    name: project9-requirecurrent
 
 - project:
     name: org/project1
     pipeline:
       jobs:
         - project1-pipeline
+    trigger_status:
+      jobs:
+        - project1-pipeline
 
 - project:
     name: org/project2
@@ -182,3 +231,15 @@
     older_than:
       jobs:
         - project7-olderthan
+
+- project:
+    name: org/project8
+    require_open:
+      jobs:
+        - project8-requireopen
+
+- project:
+    name: org/project9
+    require_current:
+      jobs:
+        - project9-requirecurrent
diff --git a/tests/fixtures/layouts/unmanaged-project.yaml b/tests/fixtures/layouts/unmanaged-project.yaml
new file mode 100644
index 0000000..d72c26e
--- /dev/null
+++ b/tests/fixtures/layouts/unmanaged-project.yaml
@@ -0,0 +1,25 @@
+- pipeline:
+    name: check
+    manager: independent
+    require:
+      gerrit:
+        open: True
+        current-patchset: True
+    trigger:
+      gerrit:
+        - event: patchset-created
+    success:
+      gerrit:
+        verified: 1
+    failure:
+      gerrit:
+        verified: -1
+    start:
+      gerrit:
+        verified: 0
+
+- project:
+    name: org/project1
+    check:
+      jobs:
+        - noop
diff --git a/tests/fixtures/test_id_rsa b/tests/fixtures/test_id_rsa
new file mode 100644
index 0000000..a793bd0
--- /dev/null
+++ b/tests/fixtures/test_id_rsa
@@ -0,0 +1,15 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/tests/fixtures/test_id_rsa.pub b/tests/fixtures/test_id_rsa.pub
new file mode 100644
index 0000000..bffc726
--- /dev/null
+++ b/tests/fixtures/test_id_rsa.pub
@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQCX10EQhi7hEMk1h7/fQaEj9H2DxWR0s3RXD5UI7j1Bn21tBUusY0tPC5wXES4VfilXg+EuOKsE6z8x8txP1wd1+d6Hq3SWXnOcqxxv2ueAy6Gc31E7a2IVDYvqVsAOtxsWddvMGTj98/lexQBX6Bh+wmuba/43lq5UPepwvfgNOQ== Private Key For Zuul Tests DO NOT USE
diff --git a/tests/fixtures/zuul-github-driver.conf b/tests/fixtures/zuul-github-driver.conf
index ab34619..dfa813d 100644
--- a/tests/fixtures/zuul-github-driver.conf
+++ b/tests/fixtures/zuul-github-driver.conf
@@ -3,7 +3,7 @@
 
 [zuul]
 job_name_in_report=true
-status_url=http://zuul.example.com/status
+status_url=http://zuul.example.com/status/#{change.number},{change.patchset}
 
 [merger]
 git_dir=/tmp/zuul-test/git
diff --git a/tests/fixtures/zuul-push-reqs.conf b/tests/fixtures/zuul-push-reqs.conf
new file mode 100644
index 0000000..661ac79
--- /dev/null
+++ b/tests/fixtures/zuul-push-reqs.conf
@@ -0,0 +1,23 @@
+[gearman]
+server=127.0.0.1
+
+[zuul]
+job_name_in_report=true
+status_url=http://zuul.example.com/status
+
+[merger]
+git_dir=/tmp/zuul-test/git
+git_user_email=zuul@example.com
+git_user_name=zuul
+zuul_url=http://zuul.example.com/p
+
+[executor]
+git_dir=/tmp/zuul-test/executor-git
+
+[connection github]
+driver=github
+
+[connection gerrit]
+driver=gerrit
+server=review.example.com
+user=jenkins
diff --git a/tests/unit/test_bubblewrap.py b/tests/unit/test_bubblewrap.py
new file mode 100644
index 0000000..b274944
--- /dev/null
+++ b/tests/unit/test_bubblewrap.py
@@ -0,0 +1,54 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import fixtures
+import logging
+import subprocess
+import tempfile
+import testtools
+
+from zuul.driver import bubblewrap
+from zuul.executor.server import SshAgent
+
+
+class TestBubblewrap(testtools.TestCase):
+    def setUp(self):
+        super(TestBubblewrap, self).setUp()
+        self.log_fixture = self.useFixture(
+            fixtures.FakeLogger(level=logging.DEBUG))
+        self.useFixture(fixtures.NestedTempfile())
+
+    def test_bubblewrap_wraps(self):
+        bwrap = bubblewrap.BubblewrapDriver()
+        work_dir = tempfile.mkdtemp()
+        ansible_dir = tempfile.mkdtemp()
+        ssh_agent = SshAgent()
+        self.addCleanup(ssh_agent.stop)
+        ssh_agent.start()
+        po = bwrap.getPopen(work_dir=work_dir,
+                            ansible_dir=ansible_dir,
+                            ssh_auth_sock=ssh_agent.env['SSH_AUTH_SOCK'])
+        self.assertTrue(po.passwd_r > 2)
+        self.assertTrue(po.group_r > 2)
+        self.assertTrue(work_dir in po.command)
+        self.assertTrue(ansible_dir in po.command)
+        # Now run /usr/bin/id to verify passwd/group entries made it in
+        true_proc = po(['/usr/bin/id'], stdout=subprocess.PIPE,
+                       stderr=subprocess.PIPE)
+        (output, errs) = true_proc.communicate()
+        # Make sure it printed things on stdout
+        self.assertTrue(len(output.strip()))
+        # And that it did not print things on stderr
+        self.assertEqual(0, len(errs.strip()))
+        # Make sure the _r's are closed
+        self.assertIsNone(po.passwd_r)
+        self.assertIsNone(po.group_r)
diff --git a/tests/unit/test_cloner.py b/tests/unit/test_cloner.py
deleted file mode 100644
index e65904b..0000000
--- a/tests/unit/test_cloner.py
+++ /dev/null
@@ -1,752 +0,0 @@
-#!/usr/bin/env python
-
-# Copyright 2012 Hewlett-Packard Development Company, L.P.
-# Copyright 2014 Wikimedia Foundation Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-
-import logging
-import os
-import shutil
-import time
-
-import git
-
-import zuul.lib.cloner
-
-from tests.base import ZuulTestCase
-
-
-class TestCloner(ZuulTestCase):
-
-    log = logging.getLogger("zuul.test.cloner")
-    workspace_root = None
-
-    def setUp(self):
-        self.skip("Disabled for early v3 development")
-
-        super(TestCloner, self).setUp()
-        self.workspace_root = os.path.join(self.test_root, 'workspace')
-
-        self.updateConfigLayout(
-            'tests/fixtures/layout-cloner.yaml')
-        self.sched.reconfigure(self.config)
-        self.registerJobs()
-
-    def getWorkspaceRepos(self, projects):
-        repos = {}
-        for project in projects:
-            repos[project] = git.Repo(
-                os.path.join(self.workspace_root, project))
-        return repos
-
-    def getUpstreamRepos(self, projects):
-        repos = {}
-        for project in projects:
-            repos[project] = git.Repo(
-                os.path.join(self.upstream_root, project))
-        return repos
-
-    def test_cache_dir(self):
-        projects = ['org/project1', 'org/project2']
-        cache_root = os.path.join(self.test_root, "cache")
-        for project in projects:
-            upstream_repo_path = os.path.join(self.upstream_root, project)
-            cache_repo_path = os.path.join(cache_root, project)
-            git.Repo.clone_from(upstream_repo_path, cache_repo_path)
-
-        self.worker.hold_jobs_in_build = True
-        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
-        A.addApproval('CRVW', 2)
-        self.fake_gerrit.addEvent(A.addApproval('APRV', 1))
-
-        self.waitUntilSettled()
-
-        self.assertEquals(1, len(self.builds), "One build is running")
-
-        B = self.fake_gerrit.addFakeChange('org/project2', 'master', 'B')
-        B.setMerged()
-
-        upstream = self.getUpstreamRepos(projects)
-        states = [{
-            'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-            'org/project2': str(upstream['org/project2'].commit('master')),
-        }]
-
-        for number, build in enumerate(self.builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters['ZUUL_BRANCH'],
-                zuul_ref=build.parameters['ZUUL_REF'],
-                zuul_url=self.src_root,
-                cache_dir=cache_root,
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct' % (project, number))
-
-        work = self.getWorkspaceRepos(projects)
-        # project1 is the zuul_project so the origin should be set to the
-        # zuul_url since that is the most up to date.
-        cache_repo_path = os.path.join(cache_root, 'org/project1')
-        self.assertNotEqual(
-            work['org/project1'].remotes.origin.url,
-            cache_repo_path,
-            'workspace repo origin should not be the cache'
-        )
-        zuul_url_repo_path = os.path.join(self.git_root, 'org/project1')
-        self.assertEqual(
-            work['org/project1'].remotes.origin.url,
-            zuul_url_repo_path,
-            'workspace repo origin should be the zuul url'
-        )
-
-        # project2 is not the zuul_project so the origin should be set
-        # to upstream since that is the best we can do
-        cache_repo_path = os.path.join(cache_root, 'org/project2')
-        self.assertNotEqual(
-            work['org/project2'].remotes.origin.url,
-            cache_repo_path,
-            'workspace repo origin should not be the cache'
-        )
-        upstream_repo_path = os.path.join(self.upstream_root, 'org/project2')
-        self.assertEqual(
-            work['org/project2'].remotes.origin.url,
-            upstream_repo_path,
-            'workspace repo origin should be the upstream url'
-        )
-
-        self.worker.hold_jobs_in_build = False
-        self.worker.release()
-        self.waitUntilSettled()
-
-    def test_one_branch(self):
-        self.worker.hold_jobs_in_build = True
-
-        projects = ['org/project1', 'org/project2']
-        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
-        B = self.fake_gerrit.addFakeChange('org/project2', 'master', 'B')
-        A.addApproval('CRVW', 2)
-        B.addApproval('CRVW', 2)
-        self.fake_gerrit.addEvent(A.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(B.addApproval('APRV', 1))
-
-        self.waitUntilSettled()
-
-        self.assertEquals(2, len(self.builds), "Two builds are running")
-
-        upstream = self.getUpstreamRepos(projects)
-        states = [
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[1].parameters['ZUUL_COMMIT'],
-             },
-        ]
-
-        for number, build in enumerate(self.builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters['ZUUL_BRANCH'],
-                zuul_ref=build.parameters['ZUUL_REF'],
-                zuul_url=self.src_root,
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct' % (project, number))
-
-            shutil.rmtree(self.workspace_root)
-
-        self.worker.hold_jobs_in_build = False
-        self.worker.release()
-        self.waitUntilSettled()
-
-    def test_multi_branch(self):
-        self.worker.hold_jobs_in_build = True
-        projects = ['org/project1', 'org/project2',
-                    'org/project3', 'org/project4']
-
-        self.create_branch('org/project2', 'stable/havana')
-        self.create_branch('org/project4', 'stable/havana')
-        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
-        B = self.fake_gerrit.addFakeChange('org/project2', 'stable/havana',
-                                           'B')
-        C = self.fake_gerrit.addFakeChange('org/project3', 'master', 'C')
-        A.addApproval('CRVW', 2)
-        B.addApproval('CRVW', 2)
-        C.addApproval('CRVW', 2)
-        self.fake_gerrit.addEvent(A.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(B.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(C.addApproval('APRV', 1))
-
-        self.waitUntilSettled()
-
-        self.assertEquals(3, len(self.builds), "Three builds are running")
-
-        upstream = self.getUpstreamRepos(projects)
-        states = [
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit('master')),
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].
-                                 commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].
-                                 commit('stable/havana')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit('master')),
-             'org/project3': self.builds[2].parameters['ZUUL_COMMIT'],
-             'org/project4': str(upstream['org/project4'].
-                                 commit('master')),
-             },
-        ]
-
-        for number, build in enumerate(self.builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters['ZUUL_BRANCH'],
-                zuul_ref=build.parameters['ZUUL_REF'],
-                zuul_url=self.src_root,
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct' % (project, number))
-            shutil.rmtree(self.workspace_root)
-
-        self.worker.hold_jobs_in_build = False
-        self.worker.release()
-        self.waitUntilSettled()
-
-    def test_upgrade(self):
-        # Simulates an upgrade test
-        self.worker.hold_jobs_in_build = True
-        projects = ['org/project1', 'org/project2', 'org/project3',
-                    'org/project4', 'org/project5', 'org/project6']
-
-        self.create_branch('org/project2', 'stable/havana')
-        self.create_branch('org/project3', 'stable/havana')
-        self.create_branch('org/project4', 'stable/havana')
-        self.create_branch('org/project5', 'stable/havana')
-        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
-        B = self.fake_gerrit.addFakeChange('org/project2', 'master', 'B')
-        C = self.fake_gerrit.addFakeChange('org/project3', 'stable/havana',
-                                           'C')
-        D = self.fake_gerrit.addFakeChange('org/project3', 'master', 'D')
-        E = self.fake_gerrit.addFakeChange('org/project4', 'stable/havana',
-                                           'E')
-        A.addApproval('CRVW', 2)
-        B.addApproval('CRVW', 2)
-        C.addApproval('CRVW', 2)
-        D.addApproval('CRVW', 2)
-        E.addApproval('CRVW', 2)
-        self.fake_gerrit.addEvent(A.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(B.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(C.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(D.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(E.addApproval('APRV', 1))
-
-        self.waitUntilSettled()
-
-        self.assertEquals(5, len(self.builds), "Five builds are running")
-
-        # Check the old side of the upgrade first
-        upstream = self.getUpstreamRepos(projects)
-        states = [
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit(
-                                 'stable/havana')),
-             'org/project3': str(upstream['org/project3'].commit(
-                                 'stable/havana')),
-             'org/project4': str(upstream['org/project4'].commit(
-                                 'stable/havana')),
-             'org/project5': str(upstream['org/project5'].commit(
-                                 'stable/havana')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit(
-                                 'stable/havana')),
-             'org/project3': str(upstream['org/project3'].commit(
-                                 'stable/havana')),
-             'org/project4': str(upstream['org/project4'].commit(
-                                 'stable/havana')),
-             'org/project5': str(upstream['org/project5'].commit(
-                                 'stable/havana')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit(
-                                 'stable/havana')),
-             'org/project3': self.builds[2].parameters['ZUUL_COMMIT'],
-             'org/project4': str(upstream['org/project4'].commit(
-                                 'stable/havana')),
-
-             'org/project5': str(upstream['org/project5'].commit(
-                                 'stable/havana')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit(
-                                 'stable/havana')),
-             'org/project3': self.builds[2].parameters['ZUUL_COMMIT'],
-             'org/project4': str(upstream['org/project4'].commit(
-                                 'stable/havana')),
-             'org/project5': str(upstream['org/project5'].commit(
-                                 'stable/havana')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit(
-                                 'stable/havana')),
-             'org/project3': self.builds[2].parameters['ZUUL_COMMIT'],
-             'org/project4': self.builds[4].parameters['ZUUL_COMMIT'],
-             'org/project5': str(upstream['org/project5'].commit(
-                                 'stable/havana')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-        ]
-
-        for number, build in enumerate(self.builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters['ZUUL_BRANCH'],
-                zuul_ref=build.parameters['ZUUL_REF'],
-                zuul_url=self.src_root,
-                branch='stable/havana',  # Old branch for upgrade
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct on old side of upgrade' %
-                                  (project, number))
-            shutil.rmtree(self.workspace_root)
-
-        # Check the new side of the upgrade
-        states = [
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit('master')),
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project3': self.builds[3].parameters['ZUUL_COMMIT'],
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project3': self.builds[3].parameters['ZUUL_COMMIT'],
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-        ]
-
-        for number, build in enumerate(self.builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters['ZUUL_BRANCH'],
-                zuul_ref=build.parameters['ZUUL_REF'],
-                zuul_url=self.src_root,
-                branch='master',  # New branch for upgrade
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct on old side of upgrade' %
-                                  (project, number))
-            shutil.rmtree(self.workspace_root)
-
-        self.worker.hold_jobs_in_build = False
-        self.worker.release()
-        self.waitUntilSettled()
-
-    def test_project_override(self):
-        self.worker.hold_jobs_in_build = True
-        projects = ['org/project1', 'org/project2', 'org/project3',
-                    'org/project4', 'org/project5', 'org/project6']
-
-        self.create_branch('org/project3', 'stable/havana')
-        self.create_branch('org/project4', 'stable/havana')
-        self.create_branch('org/project6', 'stable/havana')
-        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
-        B = self.fake_gerrit.addFakeChange('org/project1', 'master', 'B')
-        C = self.fake_gerrit.addFakeChange('org/project2', 'master', 'C')
-        D = self.fake_gerrit.addFakeChange('org/project3', 'stable/havana',
-                                           'D')
-        A.addApproval('CRVW', 2)
-        B.addApproval('CRVW', 2)
-        C.addApproval('CRVW', 2)
-        D.addApproval('CRVW', 2)
-        self.fake_gerrit.addEvent(A.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(B.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(C.addApproval('APRV', 1))
-        self.fake_gerrit.addEvent(D.addApproval('APRV', 1))
-
-        self.waitUntilSettled()
-
-        self.assertEquals(4, len(self.builds), "Four builds are running")
-
-        upstream = self.getUpstreamRepos(projects)
-        states = [
-            {'org/project1': self.builds[0].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit('master')),
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project2': str(upstream['org/project2'].commit('master')),
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[2].parameters['ZUUL_COMMIT'],
-             'org/project3': str(upstream['org/project3'].commit('master')),
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit('master')),
-             },
-            {'org/project1': self.builds[1].parameters['ZUUL_COMMIT'],
-             'org/project2': self.builds[2].parameters['ZUUL_COMMIT'],
-             'org/project3': self.builds[3].parameters['ZUUL_COMMIT'],
-             'org/project4': str(upstream['org/project4'].commit('master')),
-             'org/project5': str(upstream['org/project5'].commit('master')),
-             'org/project6': str(upstream['org/project6'].commit(
-                                 'stable/havana')),
-             },
-        ]
-
-        for number, build in enumerate(self.builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters['ZUUL_BRANCH'],
-                zuul_ref=build.parameters['ZUUL_REF'],
-                zuul_url=self.src_root,
-                project_branches={'org/project4': 'master'},
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct' % (project, number))
-            shutil.rmtree(self.workspace_root)
-
-        self.worker.hold_jobs_in_build = False
-        self.worker.release()
-        self.waitUntilSettled()
-
-    def test_periodic(self):
-        self.worker.hold_jobs_in_build = True
-        self.create_branch('org/project', 'stable/havana')
-        self.updateConfigLayout(
-            'tests/fixtures/layout-timer.yaml')
-        self.sched.reconfigure(self.config)
-        self.registerJobs()
-
-        # The pipeline triggers every second, so we should have seen
-        # several by now.
-        time.sleep(5)
-        self.waitUntilSettled()
-
-        builds = self.builds[:]
-
-        self.worker.hold_jobs_in_build = False
-        # Stop queuing timer triggered jobs so that the assertions
-        # below don't race against more jobs being queued.
-        self.updateConfigLayout(
-            'tests/fixtures/layout-no-timer.yaml')
-        self.sched.reconfigure(self.config)
-        self.registerJobs()
-        self.worker.release()
-        self.waitUntilSettled()
-
-        projects = ['org/project']
-
-        self.assertEquals(2, len(builds), "Two builds are running")
-
-        upstream = self.getUpstreamRepos(projects)
-        states = [
-            {'org/project':
-                str(upstream['org/project'].commit('stable/havana')),
-             },
-            {'org/project':
-                str(upstream['org/project'].commit('stable/havana')),
-             },
-        ]
-
-        for number, build in enumerate(builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters.get('ZUUL_BRANCH', None),
-                zuul_ref=build.parameters.get('ZUUL_REF', None),
-                zuul_url=self.src_root,
-                branch='stable/havana',
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct' % (project, number))
-
-            shutil.rmtree(self.workspace_root)
-
-        self.worker.hold_jobs_in_build = False
-        self.worker.release()
-        self.waitUntilSettled()
-
-    def test_periodic_update(self):
-        # Test that the merger correctly updates its local repository
-        # before running a periodic job.
-
-        # Prime the merger with the current state
-        A = self.fake_gerrit.addFakeChange('org/project', 'master', 'A')
-        self.fake_gerrit.addEvent(A.getPatchsetCreatedEvent(1))
-        self.waitUntilSettled()
-
-        # Merge a different change
-        B = self.fake_gerrit.addFakeChange('org/project', 'master', 'B')
-        B.setMerged()
-
-        # Start a periodic job
-        self.worker.hold_jobs_in_build = True
-        self.executor.negative_function_cache_ttl = 0
-        self.config.set('zuul', 'layout_config',
-                        'tests/fixtures/layout-timer.yaml')
-        self.sched.reconfigure(self.config)
-        self.registerJobs()
-
-        # The pipeline triggers every second, so we should have seen
-        # several by now.
-        time.sleep(5)
-        self.waitUntilSettled()
-
-        builds = self.builds[:]
-
-        self.worker.hold_jobs_in_build = False
-        # Stop queuing timer triggered jobs so that the assertions
-        # below don't race against more jobs being queued.
-        self.config.set('zuul', 'layout_config',
-                        'tests/fixtures/layout-no-timer.yaml')
-        self.sched.reconfigure(self.config)
-        self.registerJobs()
-        self.worker.release()
-        self.waitUntilSettled()
-
-        projects = ['org/project']
-
-        self.assertEquals(2, len(builds), "Two builds are running")
-
-        upstream = self.getUpstreamRepos(projects)
-        self.assertEqual(upstream['org/project'].commit('master').hexsha,
-                         B.patchsets[0]['revision'])
-        states = [
-            {'org/project':
-                str(upstream['org/project'].commit('master')),
-             },
-            {'org/project':
-                str(upstream['org/project'].commit('master')),
-             },
-        ]
-
-        for number, build in enumerate(builds):
-            self.log.debug("Build parameters: %s", build.parameters)
-            cloner = zuul.lib.cloner.Cloner(
-                git_base_url=self.upstream_root,
-                projects=projects,
-                workspace=self.workspace_root,
-                zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-                zuul_branch=build.parameters.get('ZUUL_BRANCH', None),
-                zuul_ref=build.parameters.get('ZUUL_REF', None),
-                zuul_url=self.git_root,
-            )
-            cloner.execute()
-            work = self.getWorkspaceRepos(projects)
-            state = states[number]
-
-            for project in projects:
-                self.assertEquals(state[project],
-                                  str(work[project].commit('HEAD')),
-                                  'Project %s commit for build %s should '
-                                  'be correct' % (project, number))
-
-            shutil.rmtree(self.workspace_root)
-
-        self.worker.hold_jobs_in_build = False
-        self.worker.release()
-        self.waitUntilSettled()
-
-    def test_post_checkout(self):
-        self.worker.hold_jobs_in_build = True
-        project = "org/project1"
-
-        A = self.fake_gerrit.addFakeChange(project, 'master', 'A')
-        event = A.getRefUpdatedEvent()
-        A.setMerged()
-        self.fake_gerrit.addEvent(event)
-        self.waitUntilSettled()
-
-        build = self.builds[0]
-        state = {'org/project1': build.parameters['ZUUL_COMMIT']}
-
-        build.release()
-        self.waitUntilSettled()
-
-        cloner = zuul.lib.cloner.Cloner(
-            git_base_url=self.upstream_root,
-            projects=[project],
-            workspace=self.workspace_root,
-            zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-            zuul_branch=build.parameters.get('ZUUL_BRANCH', None),
-            zuul_ref=build.parameters.get('ZUUL_REF', None),
-            zuul_newrev=build.parameters.get('ZUUL_NEWREV', None),
-            zuul_url=self.git_root,
-        )
-        cloner.execute()
-        work = self.getWorkspaceRepos([project])
-        self.assertEquals(state[project],
-                          str(work[project].commit('HEAD')),
-                          'Project %s commit for build %s should '
-                          'be correct' % (project, 0))
-        shutil.rmtree(self.workspace_root)
-
-    def test_post_and_master_checkout(self):
-        self.worker.hold_jobs_in_build = True
-        projects = ["org/project1", "org/project2"]
-
-        A = self.fake_gerrit.addFakeChange(projects[0], 'master', 'A')
-        event = A.getRefUpdatedEvent()
-        A.setMerged()
-        self.fake_gerrit.addEvent(event)
-        self.waitUntilSettled()
-
-        build = self.builds[0]
-        upstream = self.getUpstreamRepos(projects)
-        state = {'org/project1':
-                 build.parameters['ZUUL_COMMIT'],
-                 'org/project2':
-                 str(upstream['org/project2'].commit('master')),
-                 }
-
-        build.release()
-        self.waitUntilSettled()
-
-        cloner = zuul.lib.cloner.Cloner(
-            git_base_url=self.upstream_root,
-            projects=projects,
-            workspace=self.workspace_root,
-            zuul_project=build.parameters.get('ZUUL_PROJECT', None),
-            zuul_branch=build.parameters.get('ZUUL_BRANCH', None),
-            zuul_ref=build.parameters.get('ZUUL_REF', None),
-            zuul_newrev=build.parameters.get('ZUUL_NEWREV', None),
-            zuul_url=self.git_root,
-        )
-        cloner.execute()
-        work = self.getWorkspaceRepos(projects)
-
-        for project in projects:
-            self.assertEquals(state[project],
-                              str(work[project].commit('HEAD')),
-                              'Project %s commit for build %s should '
-                              'be correct' % (project, 0))
-        shutil.rmtree(self.workspace_root)
diff --git a/tests/unit/test_cloner_cmd.py b/tests/unit/test_cloner_cmd.py
index 2d8747f..84bd243 100644
--- a/tests/unit/test_cloner_cmd.py
+++ b/tests/unit/test_cloner_cmd.py
@@ -26,7 +26,7 @@
 
     def test_default_cache_dir_empty(self):
         self.app.parse_arguments(['base', 'repo'])
-        self.assertEqual(None, self.app.args.cache_dir)
+        self.assertIsNone(self.app.args.cache_dir)
 
     def test_default_cache_dir_environ(self):
         try:
diff --git a/tests/unit/test_connection.py b/tests/unit/test_connection.py
index 92270b7..142a248 100644
--- a/tests/unit/test_connection.py
+++ b/tests/unit/test_connection.py
@@ -266,6 +266,48 @@
         self.executor_server.release()
         self.waitUntilSettled()
 
+    def test_multiple_project_separate_gerrits_common_pipeline(self):
+        self.executor_server.hold_jobs_in_build = True
+
+        A = self.fake_another_gerrit.addFakeChange(
+            'org/project2', 'master', 'A')
+        self.fake_another_gerrit.addEvent(A.getPatchsetCreatedEvent(1))
+
+        self.waitUntilSettled()
+
+        self.assertBuilds([dict(name='project-test2',
+                                changes='1,1',
+                                project='org/project2',
+                                pipeline='common_check')])
+
+        # NOTE(jamielennox): the tests back the git repo for both connections
+        # onto the same git repo on the file system. If we just create another
+        # fake change the fake_review_gerrit will try to create another 1,1
+        # change and git will fail to create the ref. Arbitrarily set it to get
+        # around the problem.
+        self.fake_review_gerrit.change_number = 50
+
+        B = self.fake_review_gerrit.addFakeChange(
+            'org/project2', 'master', 'B')
+        self.fake_review_gerrit.addEvent(B.getPatchsetCreatedEvent(1))
+
+        self.waitUntilSettled()
+
+        self.assertBuilds([
+            dict(name='project-test2',
+                 changes='1,1',
+                 project='org/project2',
+                 pipeline='common_check'),
+            dict(name='project-test1',
+                 changes='51,1',
+                 project='org/project2',
+                 pipeline='common_check'),
+        ])
+
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
+        self.waitUntilSettled()
+
 
 class TestConnectionsMerger(ZuulTestCase):
     config_file = 'zuul-connections-merger.conf'
diff --git a/tests/unit/test_executor.py b/tests/unit/test_executor.py
new file mode 100644
index 0000000..100e4ec
--- /dev/null
+++ b/tests/unit/test_executor.py
@@ -0,0 +1,349 @@
+#!/usr/bin/env python
+
+# Copyright 2012 Hewlett-Packard Development Company, L.P.
+# Copyright 2014 Wikimedia Foundation Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import time
+
+from tests.base import ZuulTestCase, simple_layout
+
+
+class TestExecutorRepos(ZuulTestCase):
+    tenant_config_file = 'config/single-tenant/main.yaml'
+
+    log = logging.getLogger("zuul.test.executor")
+
+    def assertRepoState(self, repo, state, project, build, number):
+        if 'branch' in state:
+            self.assertFalse(repo.head.is_detached,
+                             'Project %s commit for build %s #%s should '
+                             'not have a detached HEAD' % (
+                                 project, build, number))
+            self.assertEquals(repo.active_branch.name,
+                              state['branch'],
+                              'Project %s commit for build %s #%s should '
+                              'be on the correct branch' % (
+                                  project, build, number))
+        if 'commit' in state:
+            self.assertEquals(state['commit'],
+                              str(repo.commit('HEAD')),
+                              'Project %s commit for build %s #%s should '
+                              'be correct' % (
+                                  project, build, number))
+        ref = repo.commit('HEAD')
+        repo_messages = set(
+            [c.message.strip() for c in repo.iter_commits(ref)])
+        if 'present' in state:
+            for change in state['present']:
+                msg = '%s-1' % change.subject
+                self.assertTrue(msg in repo_messages,
+                                'Project %s for build %s #%s should '
+                                'have change %s' % (
+                                    project, build, number, change.subject))
+        if 'absent' in state:
+            for change in state['absent']:
+                msg = '%s-1' % change.subject
+                self.assertTrue(msg not in repo_messages,
+                                'Project %s for build %s #%s should '
+                                'not have change %s' % (
+                                    project, build, number, change.subject))
+
+    @simple_layout('layouts/repo-checkout-two-project.yaml')
+    def test_one_branch(self):
+        self.executor_server.hold_jobs_in_build = True
+
+        p1 = 'review.example.com/org/project1'
+        p2 = 'review.example.com/org/project2'
+        projects = [p1, p2]
+        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
+        B = self.fake_gerrit.addFakeChange('org/project2', 'master', 'B')
+        A.addApproval('code-review', 2)
+        B.addApproval('code-review', 2)
+        self.fake_gerrit.addEvent(A.addApproval('approved', 1))
+        self.fake_gerrit.addEvent(B.addApproval('approved', 1))
+
+        self.waitUntilSettled()
+
+        self.assertEquals(2, len(self.builds), "Two builds are running")
+
+        upstream = self.getUpstreamRepos(projects)
+        states = [
+            {p1: dict(present=[A], absent=[B], branch='master'),
+             p2: dict(commit=str(upstream[p2].commit('master')),
+                      branch='master'),
+             },
+            {p1: dict(present=[A], absent=[B], branch='master'),
+             p2: dict(present=[B], absent=[A], branch='master'),
+             },
+        ]
+
+        for number, build in enumerate(self.builds):
+            self.log.debug("Build parameters: %s", build.parameters)
+            work = build.getWorkspaceRepos(projects)
+            state = states[number]
+
+            for project in projects:
+                self.assertRepoState(work[project], state[project],
+                                     project, build, number)
+
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
+        self.waitUntilSettled()
+
+    @simple_layout('layouts/repo-checkout-four-project.yaml')
+    def test_multi_branch(self):
+        self.executor_server.hold_jobs_in_build = True
+
+        p1 = 'review.example.com/org/project1'
+        p2 = 'review.example.com/org/project2'
+        p3 = 'review.example.com/org/project3'
+        p4 = 'review.example.com/org/project4'
+        projects = [p1, p2, p3, p4]
+
+        self.create_branch('org/project2', 'stable/havana')
+        self.create_branch('org/project4', 'stable/havana')
+        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
+        B = self.fake_gerrit.addFakeChange('org/project2', 'stable/havana',
+                                           'B')
+        C = self.fake_gerrit.addFakeChange('org/project3', 'master', 'C')
+        A.addApproval('code-review', 2)
+        B.addApproval('code-review', 2)
+        C.addApproval('code-review', 2)
+        self.fake_gerrit.addEvent(A.addApproval('approved', 1))
+        self.fake_gerrit.addEvent(B.addApproval('approved', 1))
+        self.fake_gerrit.addEvent(C.addApproval('approved', 1))
+
+        self.waitUntilSettled()
+
+        self.assertEquals(3, len(self.builds), "Three builds are running")
+
+        upstream = self.getUpstreamRepos(projects)
+        states = [
+            {p1: dict(present=[A], absent=[B, C], branch='master'),
+             p2: dict(commit=str(upstream[p2].commit('master')),
+                      branch='master'),
+             p3: dict(commit=str(upstream[p3].commit('master')),
+                      branch='master'),
+             p4: dict(commit=str(upstream[p4].commit('master')),
+                      branch='master'),
+             },
+            {p1: dict(present=[A], absent=[B, C], branch='master'),
+             p2: dict(present=[B], absent=[A, C], branch='stable/havana'),
+             p3: dict(commit=str(upstream[p3].commit('master')),
+                      branch='master'),
+             p4: dict(commit=str(upstream[p4].commit('stable/havana')),
+                      branch='stable/havana'),
+             },
+            {p1: dict(present=[A], absent=[B, C], branch='master'),
+             p2: dict(commit=str(upstream[p2].commit('master')),
+                      branch='master'),
+             p3: dict(present=[C], absent=[A, B], branch='master'),
+             p4: dict(commit=str(upstream[p4].commit('master')),
+                      branch='master'),
+             },
+        ]
+
+        for number, build in enumerate(self.builds):
+            self.log.debug("Build parameters: %s", build.parameters)
+            work = build.getWorkspaceRepos(projects)
+            state = states[number]
+
+            for project in projects:
+                self.assertRepoState(work[project], state[project],
+                                     project, build, number)
+
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
+        self.waitUntilSettled()
+
+    @simple_layout('layouts/repo-checkout-six-project.yaml')
+    def test_project_override(self):
+        self.executor_server.hold_jobs_in_build = True
+
+        p1 = 'review.example.com/org/project1'
+        p2 = 'review.example.com/org/project2'
+        p3 = 'review.example.com/org/project3'
+        p4 = 'review.example.com/org/project4'
+        p5 = 'review.example.com/org/project5'
+        p6 = 'review.example.com/org/project6'
+        projects = [p1, p2, p3, p4, p5, p6]
+
+        self.create_branch('org/project3', 'stable/havana')
+        self.create_branch('org/project4', 'stable/havana')
+        self.create_branch('org/project6', 'stable/havana')
+        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
+        B = self.fake_gerrit.addFakeChange('org/project1', 'master', 'B')
+        C = self.fake_gerrit.addFakeChange('org/project2', 'master', 'C')
+        D = self.fake_gerrit.addFakeChange('org/project3', 'stable/havana',
+                                           'D')
+        A.addApproval('code-review', 2)
+        B.addApproval('code-review', 2)
+        C.addApproval('code-review', 2)
+        D.addApproval('code-review', 2)
+        self.fake_gerrit.addEvent(A.addApproval('approved', 1))
+        self.fake_gerrit.addEvent(B.addApproval('approved', 1))
+        self.fake_gerrit.addEvent(C.addApproval('approved', 1))
+        self.fake_gerrit.addEvent(D.addApproval('approved', 1))
+
+        self.waitUntilSettled()
+
+        self.assertEquals(4, len(self.builds), "Four builds are running")
+
+        upstream = self.getUpstreamRepos(projects)
+        states = [
+            {p1: dict(present=[A], absent=[B, C, D], branch='master'),
+             p2: dict(commit=str(upstream[p2].commit('master')),
+                      branch='master'),
+             p3: dict(commit=str(upstream[p3].commit('master')),
+                      branch='master'),
+             p4: dict(commit=str(upstream[p4].commit('master')),
+                      branch='master'),
+             p5: dict(commit=str(upstream[p5].commit('master')),
+                      branch='master'),
+             p6: dict(commit=str(upstream[p6].commit('master')),
+                      branch='master'),
+             },
+            {p1: dict(present=[A, B], absent=[C, D], branch='master'),
+             p2: dict(commit=str(upstream[p2].commit('master')),
+                      branch='master'),
+             p3: dict(commit=str(upstream[p3].commit('master')),
+                      branch='master'),
+             p4: dict(commit=str(upstream[p4].commit('master')),
+                      branch='master'),
+             p5: dict(commit=str(upstream[p5].commit('master')),
+                      branch='master'),
+             p6: dict(commit=str(upstream[p6].commit('master')),
+                      branch='master'),
+             },
+            {p1: dict(present=[A, B], absent=[C, D], branch='master'),
+             p2: dict(present=[C], absent=[A, B, D], branch='master'),
+             p3: dict(commit=str(upstream[p3].commit('master')),
+                      branch='master'),
+             p4: dict(commit=str(upstream[p4].commit('master')),
+                      branch='master'),
+             p5: dict(commit=str(upstream[p5].commit('master')),
+                      branch='master'),
+             p6: dict(commit=str(upstream[p6].commit('master')),
+                      branch='master'),
+             },
+            {p1: dict(present=[A, B], absent=[C, D], branch='master'),
+             p2: dict(present=[C], absent=[A, B, D], branch='master'),
+             p3: dict(present=[D], absent=[A, B, C],
+                      branch='stable/havana'),
+             p4: dict(commit=str(upstream[p4].commit('master')),
+                      branch='master'),
+             p5: dict(commit=str(upstream[p5].commit('master')),
+                      branch='master'),
+             p6: dict(commit=str(upstream[p6].commit('stable/havana')),
+                      branch='stable/havana'),
+             },
+        ]
+
+        for number, build in enumerate(self.builds):
+            self.log.debug("Build parameters: %s", build.parameters)
+            work = build.getWorkspaceRepos(projects)
+            state = states[number]
+
+            for project in projects:
+                self.assertRepoState(work[project], state[project],
+                                     project, build, number)
+
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
+        self.waitUntilSettled()
+
+    def test_periodic(self):
+        # This test can not use simple_layout because it must start
+        # with a configuration which does not include a
+        # timer-triggered job so that we have an opportunity to set
+        # the hold flag before the first job.
+        self.executor_server.hold_jobs_in_build = True
+        # Start timer trigger - also org/project
+        self.commitConfigUpdate('common-config',
+                                'layouts/repo-checkout-timer.yaml')
+        self.sched.reconfigure(self.config)
+
+        p1 = 'review.example.com/org/project1'
+        projects = [p1]
+        self.create_branch('org/project1', 'stable/havana')
+
+        # The pipeline triggers every second, so we should have seen
+        # several by now.
+        time.sleep(5)
+        self.waitUntilSettled()
+
+        # Stop queuing timer triggered jobs so that the assertions
+        # below don't race against more jobs being queued.
+        self.commitConfigUpdate('common-config',
+                                'layouts/repo-checkout-no-timer.yaml')
+        self.sched.reconfigure(self.config)
+
+        self.assertEquals(1, len(self.builds), "One build is running")
+
+        upstream = self.getUpstreamRepos(projects)
+        states = [
+            {p1: dict(commit=str(upstream[p1].commit('stable/havana')),
+                      branch='stable/havana'),
+             },
+        ]
+
+        for number, build in enumerate(self.builds):
+            self.log.debug("Build parameters: %s", build.parameters)
+            work = build.getWorkspaceRepos(projects)
+            state = states[number]
+
+            for project in projects:
+                self.assertRepoState(work[project], state[project],
+                                     project, build, number)
+
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
+        self.waitUntilSettled()
+
+    @simple_layout('layouts/repo-checkout-post.yaml')
+    def test_post_and_master_checkout(self):
+        self.executor_server.hold_jobs_in_build = True
+        p1 = "review.example.com/org/project1"
+        p2 = "review.example.com/org/project2"
+        projects = [p1, p2]
+
+        A = self.fake_gerrit.addFakeChange('org/project1', 'master', 'A')
+        event = A.getRefUpdatedEvent()
+        A.setMerged()
+        self.fake_gerrit.addEvent(event)
+        self.waitUntilSettled()
+
+        upstream = self.getUpstreamRepos(projects)
+        states = [
+            {p1: dict(commit=str(upstream[p1].commit('master')),
+                      present=[A], branch='master'),
+             p2: dict(commit=str(upstream[p2].commit('master')),
+                      absent=[A], branch='master'),
+             },
+        ]
+
+        for number, build in enumerate(self.builds):
+            self.log.debug("Build parameters: %s", build.parameters)
+            work = build.getWorkspaceRepos(projects)
+            state = states[number]
+
+            for project in projects:
+                self.assertRepoState(work[project], state[project],
+                                     project, build, number)
+
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
+        self.waitUntilSettled()
diff --git a/tests/unit/test_github_driver.py b/tests/unit/test_github_driver.py
index c8e7341..6cc010e 100644
--- a/tests/unit/test_github_driver.py
+++ b/tests/unit/test_github_driver.py
@@ -260,7 +260,7 @@
         check_status = A.statuses[A.head_sha][0]
         check_url = ('http://zuul.example.com/status/#%s,%s' %
                      (A.number, A.head_sha))
-        self.assertEqual('check', check_status['context'])
+        self.assertEqual('tenant-one/check', check_status['context'])
         self.assertEqual('Standard check', check_status['description'])
         self.assertEqual('pending', check_status['state'])
         self.assertEqual(check_url, check_status['url'])
@@ -274,7 +274,7 @@
         check_status = A.statuses[A.head_sha][0]
         check_url = ('http://zuul.example.com/status/#%s,%s' %
                      (A.number, A.head_sha))
-        self.assertEqual('check', check_status['context'])
+        self.assertEqual('tenant-one/check', check_status['context'])
         self.assertEqual('success', check_status['state'])
         self.assertEqual(check_url, check_status['url'])
         self.assertEqual(1, len(A.comments))
@@ -297,9 +297,12 @@
         # pipeline reports success status
         self.assertEqual(3, len(A.statuses[A.head_sha]))
         report_status = A.statuses[A.head_sha][0]
-        self.assertEqual('reporting', report_status['context'])
+        self.assertEqual('tenant-one/reporting', report_status['context'])
         self.assertEqual('success', report_status['state'])
         self.assertEqual(2, len(A.comments))
+        report_url = ('http://logs.example.com/reporting/%s/%s/%s/' %
+                      (A.project, A.number, A.head_sha))
+        self.assertEqual(report_url, report_status['url'])
 
     @simple_layout('layouts/merging-github.yaml', driver='github')
     def test_report_pull_merge(self):
diff --git a/tests/unit/test_github_requirements.py b/tests/unit/test_github_requirements.py
index 60bcf74..5dd6e80 100644
--- a/tests/unit/test_github_requirements.py
+++ b/tests/unit/test_github_requirements.py
@@ -49,6 +49,30 @@
     @simple_layout('layouts/requirements-github.yaml', driver='github')
     def test_trigger_require_status(self):
         "Test trigger requirement: status"
+        A = self.fake_github.openFakePullRequest('org/project1', 'master', 'A')
+        # A comment event that we will keep submitting to trigger
+        comment = A.getCommentAddedEvent('trigger me')
+        self.fake_github.emitEvent(comment)
+        self.waitUntilSettled()
+        # No status from zuul so should not be enqueued
+        self.assertEqual(len(self.history), 0)
+
+        # An error status should not cause it to be enqueued
+        A.setStatus(A.head_sha, 'error', 'null', 'null', 'check')
+        self.fake_github.emitEvent(comment)
+        self.waitUntilSettled()
+        self.assertEqual(len(self.history), 0)
+
+        # A success status goes in
+        A.setStatus(A.head_sha, 'success', 'null', 'null', 'check')
+        self.fake_github.emitEvent(comment)
+        self.waitUntilSettled()
+        self.assertEqual(len(self.history), 1)
+        self.assertEqual(self.history[0].name, 'project1-pipeline')
+
+    @simple_layout('layouts/requirements-github.yaml', driver='github')
+    def test_trigger_on_status(self):
+        "Test trigger on: status"
         A = self.fake_github.openFakePullRequest('org/project2', 'master', 'A')
 
         # An error status should not cause it to be enqueued
@@ -264,3 +288,41 @@
         self.waitUntilSettled()
         self.assertEqual(len(self.history), 1)
         self.assertEqual(self.history[0].name, 'project7-olderthan')
+
+    @simple_layout('layouts/requirements-github.yaml', driver='github')
+    def test_require_open(self):
+
+        A = self.fake_github.openFakePullRequest('org/project8', 'master', 'A')
+        # A comment event that we will keep submitting to trigger
+        comment = A.getCommentAddedEvent('test me')
+        self.fake_github.emitEvent(comment)
+        self.waitUntilSettled()
+
+        # PR is open, we should have enqueued
+        self.assertEqual(len(self.history), 1)
+
+        # close the PR and try again
+        A.state = 'closed'
+        self.fake_github.emitEvent(comment)
+        self.waitUntilSettled()
+        # PR is closed, should not trigger
+        self.assertEqual(len(self.history), 1)
+
+    @simple_layout('layouts/requirements-github.yaml', driver='github')
+    def test_require_current(self):
+
+        A = self.fake_github.openFakePullRequest('org/project9', 'master', 'A')
+        # A sync event that we will keep submitting to trigger
+        sync = A.getPullRequestSynchronizeEvent()
+        self.fake_github.emitEvent(sync)
+        self.waitUntilSettled()
+
+        # PR head is current should enqueue
+        self.assertEqual(len(self.history), 1)
+
+        # Add a commit to the PR, re-issue the original comment event
+        A.addCommit()
+        self.fake_github.emitEvent(sync)
+        self.waitUntilSettled()
+        # Event hash is not current, should not trigger
+        self.assertEqual(len(self.history), 1)
diff --git a/tests/unit/test_log_streamer.py b/tests/unit/test_log_streamer.py
new file mode 100644
index 0000000..3ea5a8e
--- /dev/null
+++ b/tests/unit/test_log_streamer.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+
+# Copyright 2017 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import socket
+import tempfile
+
+import zuul.lib.log_streamer
+import tests.base
+
+
+class TestLogStreamer(tests.base.BaseTestCase):
+
+    log = logging.getLogger("zuul.test.cloner")
+
+    def setUp(self):
+        super(TestLogStreamer, self).setUp()
+        self.host = '0.0.0.0'
+
+    def startStreamer(self, port, root=None):
+        if not root:
+            root = tempfile.gettempdir()
+        return zuul.lib.log_streamer.LogStreamer(None, self.host, port, root)
+
+    def test_start_stop(self):
+        port = 7900
+        streamer = self.startStreamer(port)
+        self.addCleanup(streamer.stop)
+
+        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.addCleanup(s.close)
+        self.assertEqual(0, s.connect_ex((self.host, port)))
+        s.close()
+
+        streamer.stop()
+
+        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.addCleanup(s.close)
+        self.assertNotEqual(0, s.connect_ex((self.host, port)))
+        s.close()
diff --git a/tests/unit/test_model.py b/tests/unit/test_model.py
index 5f968b4..e7e53c4 100644
--- a/tests/unit/test_model.py
+++ b/tests/unit/test_model.py
@@ -106,7 +106,7 @@
         base.auth = model.AuthContext()
 
         py27 = model.Job('py27')
-        self.assertEqual(None, py27.timeout)
+        self.assertIsNone(py27.timeout)
         py27.inheritFrom(base)
         self.assertEqual(30, py27.timeout)
         self.assertEqual(['base-pre'],
@@ -115,7 +115,7 @@
                          [x.path for x in py27.run])
         self.assertEqual(['base-post'],
                          [x.path for x in py27.post_run])
-        self.assertEqual(None, py27.auth)
+        self.assertIsNone(py27.auth)
 
     def test_job_variants(self):
         # This simulates freezing a job.
@@ -433,11 +433,11 @@
             })
         layout.addJob(in_repo_job_with_inherit_false)
 
-        self.assertEqual(None, in_repo_job_without_inherit.auth)
+        self.assertIsNone(in_repo_job_without_inherit.auth)
         self.assertEqual(1, len(in_repo_job_with_inherit.auth.secrets))
         self.assertEqual(in_repo_job_with_inherit.auth.secrets[0].name,
                          'pypi-credentials')
-        self.assertEqual(None, in_repo_job_with_inherit_false.auth)
+        self.assertIsNone(in_repo_job_with_inherit_false.auth)
 
     def test_job_inheritance_job_tree(self):
         tenant = model.Tenant('tenant')
diff --git a/tests/unit/test_multi_driver.py b/tests/unit/test_multi_driver.py
index a1107de..864bd31 100644
--- a/tests/unit/test_multi_driver.py
+++ b/tests/unit/test_multi_driver.py
@@ -28,10 +28,10 @@
 
         A = self.fake_gerrit.addFakeChange('org/project', 'master', 'A')
         self.fake_gerrit.addEvent(A.getPatchsetCreatedEvent(1))
+        self.waitUntilSettled()
 
         B = self.fake_github.openFakePullRequest('org/project1', 'master', 'B')
         self.fake_github.emitEvent(B.getPullRequestOpenedEvent())
-
         self.waitUntilSettled()
 
         self.assertEqual(2, len(self.builds))
diff --git a/tests/unit/test_push_reqs.py b/tests/unit/test_push_reqs.py
new file mode 100644
index 0000000..657d9b8
--- /dev/null
+++ b/tests/unit/test_push_reqs.py
@@ -0,0 +1,53 @@
+# Copyright (c) 2017 IBM Corp.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from tests.base import ZuulTestCase
+
+
+class TestPushRequirements(ZuulTestCase):
+    config_file = 'zuul-push-reqs.conf'
+    tenant_config_file = 'config/push-reqs/main.yaml'
+
+    def setup_config(self):
+        super(TestPushRequirements, self).setup_config()
+
+    def test_push_requirements(self):
+        self.executor_server.hold_jobs_in_build = True
+
+        # Create a github change, add a change and emit a push event
+        A = self.fake_github.openFakePullRequest('org/project1', 'master', 'A')
+        old_sha = A.head_sha
+        self.fake_github.emitEvent(A.getPushEvent(old_sha))
+
+        self.waitUntilSettled()
+
+        # All but one pipeline should be skipped
+        self.assertEqual(1, len(self.builds))
+        self.assertEqual('pushhub', self.builds[0].pipeline)
+        self.assertEqual('org/project1', self.builds[0].project)
+
+        # Make a gerrit change, and emit a ref-updated event
+        B = self.fake_gerrit.addFakeChange('org/project2', 'master', 'B')
+        self.fake_gerrit.addEvent(B.getRefUpdatedEvent())
+
+        self.waitUntilSettled()
+
+        # All but one pipeline should be skipped, increasing builds by 1
+        self.assertEqual(2, len(self.builds))
+        self.assertEqual('pushgerrit', self.builds[1].pipeline)
+        self.assertEqual('org/project2', self.builds[1].project)
+
+        self.executor_server.hold_jobs_in_build = False
+        self.executor_server.release()
+        self.waitUntilSettled()
diff --git a/tests/unit/test_scheduler.py b/tests/unit/test_scheduler.py
index d8d5747..0ac42c1 100755
--- a/tests/unit/test_scheduler.py
+++ b/tests/unit/test_scheduler.py
@@ -21,9 +21,8 @@
 import os
 import re
 import shutil
-import sys
 import time
-from unittest import (skip, skipIf)
+from unittest import skip
 
 import git
 from six.moves import urllib
@@ -514,7 +513,6 @@
         self.assertEqual(B.reported, 2)
         self.assertEqual(C.reported, 2)
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_failed_change_at_head_with_queue(self):
         "Test that if a change at the head fails, queued jobs are canceled"
 
@@ -941,7 +939,6 @@
         a = source.getChange(event, refresh=True)
         self.assertTrue(source.canMerge(a, mgr.getSubmitAllowNeeds()))
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_project_merge_conflict(self):
         "Test that gate merge conflicts are handled properly"
 
@@ -963,7 +960,6 @@
         self.waitUntilSettled()
 
         self.assertEqual(A.reported, 1)
-        self.assertEqual(B.reported, 1)
         self.assertEqual(C.reported, 1)
 
         self.gearman_server.release('project-merge')
@@ -981,7 +977,7 @@
         self.assertEqual(B.data['status'], 'NEW')
         self.assertEqual(C.data['status'], 'MERGED')
         self.assertEqual(A.reported, 2)
-        self.assertEqual(B.reported, 2)
+        self.assertIn('Merge Failed', B.messages[-1])
         self.assertEqual(C.reported, 2)
 
         self.assertHistory([
@@ -993,13 +989,13 @@
             dict(name='project-test2', result='SUCCESS', changes='1,1 3,1'),
         ], ordered=False)
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_delayed_merge_conflict(self):
         "Test that delayed check merge conflicts are handled properly"
 
         # Hold jobs in the gearman queue so that we can test whether
-        # the executor returns a merge failure after the scheduler has
-        # successfully merged.
+        # the executor sucesfully merges a change based on an old
+        # repo state (frozen by the scheduler) which would otherwise
+        # conflict.
         self.gearman_server.hold_jobs_in_queue = True
         A = self.fake_gerrit.addFakeChange('org/project',
                                            'master', 'A',
@@ -1072,9 +1068,12 @@
             dict(name='project-merge', result='SUCCESS', changes='1,1'),
             dict(name='project-test1', result='SUCCESS', changes='1,1'),
             dict(name='project-test2', result='SUCCESS', changes='1,1'),
-            dict(name='project-merge', result='MERGER_FAILURE', changes='2,1'),
-            dict(name='project-merge', result='MERGER_FAILURE',
-                 changes='2,1 3,1'),
+            dict(name='project-merge', result='SUCCESS', changes='2,1'),
+            dict(name='project-test1', result='SUCCESS', changes='2,1'),
+            dict(name='project-test2', result='SUCCESS', changes='2,1'),
+            dict(name='project-merge', result='SUCCESS', changes='2,1 3,1'),
+            dict(name='project-test1', result='SUCCESS', changes='2,1 3,1'),
+            dict(name='project-test2', result='SUCCESS', changes='2,1 3,1'),
         ], ordered=False)
 
     def test_post(self):
@@ -1186,7 +1185,8 @@
         self.assertEqual(B.data['status'], 'NEW')
         self.assertEqual(B.reported, 2)
         self.assertEqual(C.data['status'], 'NEW')
-        self.assertEqual(C.reported, 2)
+        self.assertIn('This change depends on a change that failed to merge.',
+                      C.messages[-1])
         self.assertEqual(len(self.history), 1)
 
     def test_failing_dependent_changes(self):
@@ -1931,7 +1931,6 @@
         self.assertEqual(A.reported, 2)
 
     @simple_layout('layouts/no-jobs-project.yaml')
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_no_job_project(self):
         "Test that reports with no jobs don't get sent"
         A = self.fake_gerrit.addFakeChange('org/no-jobs-project',
@@ -2063,7 +2062,6 @@
         self.assertReportedStat('test-timing', '3|ms')
         self.assertReportedStat('test-gauge', '12|g')
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_stuck_job_cleanup(self):
         "Test that pending jobs are cleaned up if removed from layout"
 
@@ -2191,7 +2189,6 @@
         self.assertEqual(q1.name, 'integrated')
         self.assertEqual(q2.name, 'integrated')
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_queue_precedence(self):
         "Test that queue precedence works"
 
@@ -2336,7 +2333,6 @@
         self.assertEqual(A.data['status'], 'NEW')
         self.assertEqual(A.reported, 1)
         self.assertEqual(B.data['status'], 'NEW')
-        self.assertEqual(B.reported, 1)
         self.assertEqual(len(self.history), 0)
 
         # Add the "project-test3" job.
@@ -2352,7 +2348,7 @@
         self.assertEqual(A.data['status'], 'MERGED')
         self.assertEqual(A.reported, 2)
         self.assertEqual(B.data['status'], 'NEW')
-        self.assertEqual(B.reported, 2)
+        self.assertIn('Merge Failed', B.messages[-1])
         self.assertEqual(self.getJobFromHistory('project-merge').result,
                          'SUCCESS')
         self.assertEqual(self.getJobFromHistory('project-test1').result,
@@ -3404,6 +3400,16 @@
         self.assertFalse(self.smtp_messages[1]['body'].startswith(failure_msg))
         self.assertTrue(self.smtp_messages[1]['body'].endswith(footer_msg))
 
+    @simple_layout('layouts/unmanaged-project.yaml')
+    def test_unmanaged_project_start_message(self):
+        "Test start reporting is not done for unmanaged projects."
+        self.init_repo("org/project", tag='init')
+        A = self.fake_gerrit.addFakeChange('org/project', 'master', 'A')
+        self.fake_gerrit.addEvent(A.getPatchsetCreatedEvent(1))
+        self.waitUntilSettled()
+
+        self.assertEqual(0, len(A.messages))
+
     @skip("Disabled for early v3 development")
     def test_merge_failure_reporters(self):
         """Check that the config is set up correctly"""
@@ -3543,9 +3549,9 @@
         self.assertEqual([], running_item['failing_reasons'])
         self.assertEqual([], running_item['items_behind'])
         self.assertEqual('https://hostname/1', running_item['url'])
-        self.assertEqual(None, running_item['item_ahead'])
+        self.assertIsNone(running_item['item_ahead'])
         self.assertEqual('org/project', running_item['project'])
-        self.assertEqual(None, running_item['remaining_time'])
+        self.assertIsNone(running_item['remaining_time'])
         self.assertEqual(True, running_item['active'])
         self.assertEqual('1,1', running_item['id'])
 
@@ -3560,7 +3566,7 @@
                 self.assertEqual(7, len(job['worker']))
                 self.assertEqual(False, job['canceled'])
                 self.assertEqual(True, job['voting'])
-                self.assertEqual(None, job['result'])
+                self.assertIsNone(job['result'])
                 self.assertEqual('gate', job['pipeline'])
                 break
 
@@ -3878,7 +3884,6 @@
         self.assertEqual(B.data['status'], 'MERGED')
         self.assertEqual(B.reported, 0)
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_crd_check(self):
         "Test cross-repo dependencies in independent pipelines"
 
@@ -4029,11 +4034,9 @@
         self.assertEqual(self.history[0].changes, '2,1 1,1')
         self.assertEqual(len(tenant.layout.pipelines['check'].queues), 0)
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_crd_check_reconfiguration(self):
         self._test_crd_check_reconfiguration('org/project1', 'org/project2')
 
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_crd_undefined_project(self):
         """Test that undefined projects in dependencies are handled for
         independent pipelines"""
@@ -4043,7 +4046,6 @@
         self._test_crd_check_reconfiguration('org/project1', 'org/unknown')
 
     @simple_layout('layouts/ignore-dependencies.yaml')
-    @skipIf(sys.version_info.major > 2, 'Fails on py3')
     def test_crd_check_ignore_dependencies(self):
         "Test cross-repo dependencies can be ignored"
 
diff --git a/tests/unit/test_ssh_agent.py b/tests/unit/test_ssh_agent.py
new file mode 100644
index 0000000..c9c1ebd
--- /dev/null
+++ b/tests/unit/test_ssh_agent.py
@@ -0,0 +1,56 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import os
+import subprocess
+
+from tests.base import ZuulTestCase
+from zuul.executor.server import SshAgent
+
+
+class TestSshAgent(ZuulTestCase):
+    tenant_config_file = 'config/single-tenant/main.yaml'
+
+    def test_ssh_agent(self):
+        # Need a private key to add
+        env_copy = dict(os.environ)
+        # DISPLAY and SSH_ASKPASS will cause interactive test runners to get a
+        # surprise
+        if 'DISPLAY' in env_copy:
+            del env_copy['DISPLAY']
+        if 'SSH_ASKPASS' in env_copy:
+            del env_copy['SSH_ASKPASS']
+
+        agent = SshAgent()
+        agent.start()
+        env_copy.update(agent.env)
+
+        pub_key_file = '{}.pub'.format(self.private_key_file)
+        pub_key = None
+        with open(pub_key_file) as pub_key_f:
+            pub_key = pub_key_f.read().split('== ')[0]
+
+        agent.add(self.private_key_file)
+        keys = agent.list()
+        self.assertEqual(1, len(keys))
+        self.assertEqual(keys[0].split('== ')[0], pub_key)
+        agent.remove(self.private_key_file)
+        keys = agent.list()
+        self.assertEqual([], keys)
+        agent.stop()
+        # Agent is now dead and thus this should fail
+        with open('/dev/null') as devnull:
+            self.assertRaises(subprocess.CalledProcessError,
+                              subprocess.check_call,
+                              ['ssh-add', self.private_key_file],
+                              env=env_copy,
+                              stderr=devnull)
diff --git a/tests/unit/test_v3.py b/tests/unit/test_v3.py
index 2168a7f..18a49db 100644
--- a/tests/unit/test_v3.py
+++ b/tests/unit/test_v3.py
@@ -262,9 +262,9 @@
         self.waitUntilSettled()
 
         self.assertEqual(A.data['status'], 'NEW')
-        self.assertEqual(A.reported, 2,
-                         "A should report start and failure")
-        self.assertIn('syntax error', A.messages[1],
+        self.assertEqual(A.reported, 1,
+                         "A should report failure")
+        self.assertIn('syntax error', A.messages[0],
                       "A should have a syntax error reported")
 
     def test_trusted_syntax_error(self):
@@ -283,9 +283,9 @@
         self.waitUntilSettled()
 
         self.assertEqual(A.data['status'], 'NEW')
-        self.assertEqual(A.reported, 2,
-                         "A should report start and failure")
-        self.assertIn('syntax error', A.messages[1],
+        self.assertEqual(A.reported, 1,
+                         "A should report failure")
+        self.assertIn('syntax error', A.messages[0],
                       "A should have a syntax error reported")
 
     def test_untrusted_yaml_error(self):
@@ -303,9 +303,9 @@
         self.waitUntilSettled()
 
         self.assertEqual(A.data['status'], 'NEW')
-        self.assertEqual(A.reported, 2,
-                         "A should report start and failure")
-        self.assertIn('syntax error', A.messages[1],
+        self.assertEqual(A.reported, 1,
+                         "A should report failure")
+        self.assertIn('syntax error', A.messages[0],
                       "A should have a syntax error reported")
 
     def test_untrusted_shadow_error(self):
@@ -323,9 +323,9 @@
         self.waitUntilSettled()
 
         self.assertEqual(A.data['status'], 'NEW')
-        self.assertEqual(A.reported, 2,
-                         "A should report start and failure")
-        self.assertIn('not permitted to shadow', A.messages[1],
+        self.assertEqual(A.reported, 1,
+                         "A should report failure")
+        self.assertIn('not permitted to shadow', A.messages[0],
                       "A should have a syntax error reported")
 
 
@@ -344,6 +344,8 @@
         self.assertEqual(build.result, 'FAILURE')
         build = self.getJobFromHistory('check-vars')
         self.assertEqual(build.result, 'SUCCESS')
+        build = self.getJobFromHistory('hello-world')
+        self.assertEqual(build.result, 'SUCCESS')
         build = self.getJobFromHistory('python27')
         self.assertEqual(build.result, 'SUCCESS')
         flag_path = os.path.join(self.test_root, build.uuid + '.flag')
diff --git a/zuul/ansible/action/copy.py b/zuul/ansible/action/copy.py
index bb54430..d870c24 100644
--- a/zuul/ansible/action/copy.py
+++ b/zuul/ansible/action/copy.py
@@ -25,6 +25,6 @@
         source = self._task.args.get('src', None)
         remote_src = self._task.args.get('remote_src', False)
 
-        if not remote_src and not paths._is_safe_path(source):
+        if not remote_src and source and not paths._is_safe_path(source):
             return paths._fail_dict(source)
         return super(ActionModule, self).run(tmp, task_vars)
diff --git a/zuul/ansible/callback/zuul_stream.py b/zuul/ansible/callback/zuul_stream.py
index fd95e92..904316c 100644
--- a/zuul/ansible/callback/zuul_stream.py
+++ b/zuul/ansible/callback/zuul_stream.py
@@ -24,14 +24,14 @@
 
 
 def linesplit(socket):
-    buff = socket.recv(4096)
+    buff = socket.recv(4096).decode("utf-8")
     buffering = True
     while buffering:
         if "\n" in buff:
             (line, buff) = buff.split("\n", 1)
             yield line + "\n"
         else:
-            more = socket.recv(4096)
+            more = socket.recv(4096).decode("utf-8")
             if not more:
                 buffering = False
             else:
diff --git a/zuul/cmd/executor.py b/zuul/cmd/executor.py
index 1893f5a..931639f 100755
--- a/zuul/cmd/executor.py
+++ b/zuul/cmd/executor.py
@@ -24,9 +24,11 @@
 
 import logging
 import os
+import pwd
 import socket
 import sys
 import signal
+import tempfile
 
 import zuul.cmd
 import zuul.executor.server
@@ -37,6 +39,9 @@
 # Similar situation with gear and statsd.
 
 
+DEFAULT_FINGER_PORT = 79
+
+
 class Executor(zuul.cmd.ZuulApp):
 
     def parse_arguments(self):
@@ -72,15 +77,67 @@
         self.executor.stop()
         self.executor.join()
 
+    def start_log_streamer(self):
+        pipe_read, pipe_write = os.pipe()
+        child_pid = os.fork()
+        if child_pid == 0:
+            os.close(pipe_write)
+            import zuul.lib.log_streamer
+
+            self.log.info("Starting log streamer")
+            streamer = zuul.lib.log_streamer.LogStreamer(
+                self.user, '0.0.0.0', self.finger_port, self.jobroot_dir)
+
+            # Keep running until the parent dies:
+            pipe_read = os.fdopen(pipe_read)
+            pipe_read.read()
+            self.log.info("Stopping log streamer")
+            streamer.stop()
+            os._exit(0)
+        else:
+            os.close(pipe_read)
+            self.log_streamer_pid = child_pid
+
+    def change_privs(self):
+        '''
+        Drop our privileges to the zuul user.
+        '''
+        if os.getuid() != 0:
+            return
+        pw = pwd.getpwnam(self.user)
+        os.setgroups([])
+        os.setgid(pw.pw_gid)
+        os.setuid(pw.pw_uid)
+        os.umask(0o022)
+
     def main(self, daemon=True):
         # See comment at top of file about zuul imports
 
-        self.setup_logging('executor', 'log_config')
+        if self.config.has_option('executor', 'user'):
+            self.user = self.config.get('executor', 'user')
+        else:
+            self.user = 'zuul'
 
+        if self.config.has_option('zuul', 'jobroot_dir'):
+            self.jobroot_dir = os.path.expanduser(
+                self.config.get('zuul', 'jobroot_dir'))
+        else:
+            self.jobroot_dir = tempfile.gettempdir()
+
+        self.setup_logging('executor', 'log_config')
         self.log = logging.getLogger("zuul.Executor")
 
+        if self.config.has_option('executor', 'finger_port'):
+            self.finger_port = int(self.config.get('executor', 'finger_port'))
+        else:
+            self.finger_port = DEFAULT_FINGER_PORT
+
+        self.start_log_streamer()
+        self.change_privs()
+
         ExecutorServer = zuul.executor.server.ExecutorServer
         self.executor = ExecutorServer(self.config, self.connections,
+                                       jobdir_root=self.jobroot_dir,
                                        keep_jobdir=self.args.keep_jobdir)
         self.executor.start()
 
diff --git a/zuul/configloader.py b/zuul/configloader.py
index 1374e9b..c0267ed 100644
--- a/zuul/configloader.py
+++ b/zuul/configloader.py
@@ -229,6 +229,9 @@
 
         role = vs.Any(zuul_role, galaxy_role)
 
+        job_project = {vs.Required('name'): str,
+                       'override-branch': str}
+
         job = {vs.Required('name'): str,
                'parent': str,
                'failure-message': str,
@@ -252,10 +255,11 @@
                '_source_context': model.SourceContext,
                '_start_mark': yaml.Mark,
                'roles': to_list(role),
-               'repos': to_list(str),
+               'required-projects': to_list(vs.Any(job_project, str)),
                'vars': dict,
                'dependencies': to_list(str),
                'allowed-projects': to_list(str),
+               'override-branch': str,
                }
 
         return vs.Schema(job)
@@ -271,6 +275,7 @@
         'success-message',
         'failure-url',
         'success-url',
+        'override-branch',
     ]
 
     @staticmethod
@@ -364,10 +369,23 @@
                     ns.addNode(node)
             job.nodeset = ns
 
-        if 'repos' in conf:
-            # Accumulate repos in a set so that job inheritance
-            # is additive.
-            job.repos = job.repos.union(set(conf.get('repos', [])))
+        if 'required-projects' in conf:
+            new_projects = {}
+            projects = as_list(conf.get('required-projects', []))
+            for project in projects:
+                if isinstance(project, dict):
+                    project_name = project['name']
+                    project_override_branch = project.get('override-branch')
+                else:
+                    project_name = project
+                    project_override_branch = None
+                (trusted, project) = tenant.getProject(project_name)
+                if project is None:
+                    raise Exception("Unknown project %s" % (project_name,))
+                job_project = model.JobProject(project_name,
+                                               project_override_branch)
+                new_projects[project_name] = job_project
+            job.updateProjects(new_projects)
 
         tags = conf.get('tags')
         if tags:
@@ -519,6 +537,7 @@
             'templates': [str],
             'merge-mode': vs.Any('merge', 'merge-resolve',
                                  'cherry-pick'),
+            'default-branch': str,
             '_source_context': model.SourceContext,
             '_start_mark': yaml.Mark,
         }
@@ -554,15 +573,20 @@
             configs.extend([layout.project_templates[name]
                             for name in conf_templates])
             configs.append(project_template)
+            # Set the following values to the first one that we find and
+            # ignore subsequent settings.
             mode = conf.get('merge-mode')
             if mode and project_config.merge_mode is None:
-                # Set the merge mode to the first one that we find and
-                # ignore subsequent settings.
                 project_config.merge_mode = model.MERGER_MAP[mode]
+            default_branch = conf.get('default-branch')
+            if default_branch and project_config.default_branch is None:
+                project_config.default_branch = default_branch
         if project_config.merge_mode is None:
             # If merge mode was not specified in any project stanza,
             # set it to the default.
             project_config.merge_mode = model.MERGER_MAP['merge-resolve']
+        if project_config.default_branch is None:
+            project_config.default_branch = 'master'
         for pipeline in layout.pipelines.values():
             project_pipeline = model.ProjectPipelineConfig()
             queue_name = None
diff --git a/zuul/driver/__init__.py b/zuul/driver/__init__.py
index 671996a..0c3105d 100644
--- a/zuul/driver/__init__.py
+++ b/zuul/driver/__init__.py
@@ -254,3 +254,27 @@
 
         """
         pass
+
+
+@six.add_metaclass(abc.ABCMeta)
+class WrapperInterface(object):
+    """The wrapper interface to be implmeneted by a driver.
+
+    A driver which wraps execution of commands executed by Zuul should
+    implement this interface.
+
+    """
+
+    @abc.abstractmethod
+    def getPopen(self, **kwargs):
+        """Create and return a subprocess.Popen factory wrapped however the
+        driver sees fit.
+
+        This method is required by the interface
+
+        :arg dict kwargs: key/values for use by driver as needed
+
+        :returns: a callable that takes the same args as subprocess.Popen
+        :rtype: Callable
+        """
+        pass
diff --git a/zuul/driver/bubblewrap/__init__.py b/zuul/driver/bubblewrap/__init__.py
new file mode 100644
index 0000000..c93e912
--- /dev/null
+++ b/zuul/driver/bubblewrap/__init__.py
@@ -0,0 +1,173 @@
+# Copyright 2012 Hewlett-Packard Development Company, L.P.
+# Copyright 2013 OpenStack Foundation
+# Copyright 2016 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import argparse
+import grp
+import logging
+import os
+import pwd
+import subprocess
+import sys
+
+from six.moves import shlex_quote
+
+from zuul.driver import (Driver, WrapperInterface)
+
+
+class WrappedPopen(object):
+    def __init__(self, command, passwd_r, group_r):
+        self.command = command
+        self.passwd_r = passwd_r
+        self.group_r = group_r
+
+    def __call__(self, args, *sub_args, **kwargs):
+        try:
+            args = self.command + args
+            if kwargs.get('close_fds') or sys.version_info.major >= 3:
+                # The default in py3 is close_fds=True, so we need to pass
+                # our open fds in. However, this can only work right in
+                # py3.2 or later due to the lack of 'pass_fds' in prior
+                # versions. So until we are py3 only we can only bwrap
+                # things that are close_fds=False
+                pass_fds = list(kwargs.get('pass_fds', []))
+                for fd in (self.passwd_r, self.group_r):
+                    if fd not in pass_fds:
+                        pass_fds.append(fd)
+                kwargs['pass_fds'] = pass_fds
+            proc = subprocess.Popen(args, *sub_args, **kwargs)
+        finally:
+            self.__del__()
+        return proc
+
+    def __del__(self):
+        if self.passwd_r:
+            try:
+                os.close(self.passwd_r)
+            except OSError:
+                pass
+            self.passwd_r = None
+        if self.group_r:
+            try:
+                os.close(self.group_r)
+            except OSError:
+                pass
+            self.group_r = None
+
+
+class BubblewrapDriver(Driver, WrapperInterface):
+    name = 'bubblewrap'
+    log = logging.getLogger("zuul.BubblewrapDriver")
+
+    bwrap_command = [
+        'bwrap',
+        '--dir', '/tmp',
+        '--tmpfs', '/tmp',
+        '--dir', '/var',
+        '--dir', '/var/tmp',
+        '--dir', '/run/user/{uid}',
+        '--ro-bind', '/usr', '/usr',
+        '--ro-bind', '/lib', '/lib',
+        '--ro-bind', '/lib64', '/lib64',
+        '--ro-bind', '/bin', '/bin',
+        '--ro-bind', '/sbin', '/sbin',
+        '--ro-bind', '/etc/resolv.conf', '/etc/resolv.conf',
+        '--ro-bind', '{ansible_dir}', '{ansible_dir}',
+        '--ro-bind', '{ssh_auth_sock}', '{ssh_auth_sock}',
+        '--dir', '{work_dir}',
+        '--bind', '{work_dir}', '{work_dir}',
+        '--dev', '/dev',
+        '--dir', '{user_home}',
+        '--chdir', '/',
+        '--unshare-all',
+        '--share-net',
+        '--uid', '{uid}',
+        '--gid', '{gid}',
+        '--file', '{uid_fd}', '/etc/passwd',
+        '--file', '{gid_fd}', '/etc/group',
+    ]
+
+    def reconfigure(self, tenant):
+        pass
+
+    def stop(self):
+        pass
+
+    def getPopen(self, **kwargs):
+        # Set zuul_dir if it was not passed in
+        if 'zuul_dir' in kwargs:
+            zuul_dir = kwargs['zuul_dir']
+        else:
+            zuul_python_dir = os.path.dirname(sys.executable)
+            # We want the dir directly above bin to get the whole venv
+            zuul_dir = os.path.normpath(os.path.join(zuul_python_dir, '..'))
+
+        bwrap_command = list(self.bwrap_command)
+        if not zuul_dir.startswith('/usr'):
+            bwrap_command.extend(['--ro-bind', zuul_dir, zuul_dir])
+
+        # Need users and groups
+        uid = os.getuid()
+        passwd = pwd.getpwuid(uid)
+        passwd_bytes = b':'.join(
+            ['{}'.format(x).encode('utf8') for x in passwd])
+        (passwd_r, passwd_w) = os.pipe()
+        os.write(passwd_w, passwd_bytes)
+        os.close(passwd_w)
+
+        gid = os.getgid()
+        group = grp.getgrgid(gid)
+        group_bytes = b':'.join(
+            ['{}'.format(x).encode('utf8') for x in group])
+        group_r, group_w = os.pipe()
+        os.write(group_w, group_bytes)
+        os.close(group_w)
+
+        kwargs = dict(kwargs)  # Don't update passed in dict
+        kwargs['uid'] = uid
+        kwargs['gid'] = gid
+        kwargs['uid_fd'] = passwd_r
+        kwargs['gid_fd'] = group_r
+        kwargs['user_home'] = passwd.pw_dir
+        command = [x.format(**kwargs) for x in bwrap_command]
+
+        self.log.debug("Bubblewrap command: %s",
+                       " ".join(shlex_quote(c) for c in command))
+
+        wrapped_popen = WrappedPopen(command, passwd_r, group_r)
+
+        return wrapped_popen
+
+
+def main(args=None):
+    driver = BubblewrapDriver()
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('work_dir')
+    parser.add_argument('ansible_dir')
+    parser.add_argument('run_args', nargs='+')
+    cli_args = parser.parse_args()
+
+    ssh_auth_sock = os.environ.get('SSH_AUTH_SOCK')
+
+    popen = driver.getPopen(work_dir=cli_args.work_dir,
+                            ansible_dir=cli_args.ansible_dir,
+                            ssh_auth_sock=ssh_auth_sock)
+    x = popen(cli_args.run_args)
+    x.wait()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/zuul/driver/gerrit/gerritconnection.py b/zuul/driver/gerrit/gerritconnection.py
index 5f2f524..a1d97e7 100644
--- a/zuul/driver/gerrit/gerritconnection.py
+++ b/zuul/driver/gerrit/gerritconnection.py
@@ -626,7 +626,7 @@
             if val is True:
                 cmd += ' --%s' % key
             else:
-                cmd += ' --%s %s' % (key, val)
+                cmd += ' --label %s=%s' % (key, val)
         cmd += ' %s' % change
         out, err = self._ssh(cmd)
         return err
@@ -726,13 +726,13 @@
         if stdin_data:
             stdin.write(stdin_data)
 
-        out = stdout.read()
+        out = stdout.read().decode('utf-8')
         self.log.debug("SSH received stdout:\n%s" % out)
 
         ret = stdout.channel.recv_exit_status()
         self.log.debug("SSH exit status: %s" % ret)
 
-        err = stderr.read()
+        err = stderr.read().decode('utf-8')
         self.log.debug("SSH received stderr:\n%s" % err)
         if ret:
             raise Exception("Gerrit error executing %s" % command)
diff --git a/zuul/driver/gerrit/gerritmodel.py b/zuul/driver/gerrit/gerritmodel.py
index 009a723..818d260 100644
--- a/zuul/driver/gerrit/gerritmodel.py
+++ b/zuul/driver/gerrit/gerritmodel.py
@@ -115,6 +115,10 @@
         return True
 
     def matchesApprovals(self, change):
+        if self.required_approvals or self.reject_approvals:
+            if not hasattr(change, 'number'):
+                # Not a change, no reviews
+                return False
         if (self.required_approvals and not change.approvals
                 or self.reject_approvals and not change.approvals):
             # A change with no approvals can not match
@@ -291,10 +295,10 @@
 
 
 class GerritRefFilter(RefFilter, GerritApprovalFilter):
-    def __init__(self, open=None, current_patchset=None,
+    def __init__(self, connection_name, open=None, current_patchset=None,
                  statuses=[], required_approvals=[],
                  reject_approvals=[]):
-        RefFilter.__init__(self)
+        RefFilter.__init__(self, connection_name)
 
         GerritApprovalFilter.__init__(self,
                                       required_approvals=required_approvals,
@@ -307,6 +311,7 @@
     def __repr__(self):
         ret = '<GerritRefFilter'
 
+        ret += ' connection_name: %s' % self.connection_name
         if self.open is not None:
             ret += ' open: %s' % self.open
         if self.current_patchset is not None:
@@ -325,11 +330,21 @@
 
     def matches(self, change):
         if self.open is not None:
-            if self.open != change.open:
+            # if a "change" has no number, it's not a change, but a push
+            # and cannot possibly pass this test.
+            if hasattr(change, 'number'):
+                if self.open != change.open:
+                    return False
+            else:
                 return False
 
         if self.current_patchset is not None:
-            if self.current_patchset != change.is_current_patchset:
+            # if a "change" has no number, it's not a change, but a push
+            # and cannot possibly pass this test.
+            if hasattr(change, 'number'):
+                if self.current_patchset != change.is_current_patchset:
+                    return False
+            else:
                 return False
 
         if self.statuses:
diff --git a/zuul/driver/gerrit/gerritreporter.py b/zuul/driver/gerrit/gerritreporter.py
index a855db3..f8e8b03 100644
--- a/zuul/driver/gerrit/gerritreporter.py
+++ b/zuul/driver/gerrit/gerritreporter.py
@@ -15,7 +15,7 @@
 import logging
 import voluptuous as v
 
-
+from zuul.driver.gerrit.gerritsource import GerritSource
 from zuul.reporter import BaseReporter
 
 
@@ -25,14 +25,25 @@
     name = 'gerrit'
     log = logging.getLogger("zuul.GerritReporter")
 
-    def report(self, source, pipeline, item):
+    def report(self, pipeline, item):
         """Send a message to gerrit."""
+
+        # If the source is no GerritSource we cannot report anything here.
+        if not isinstance(item.change.project.source, GerritSource):
+            return
+
+        # For supporting several Gerrit connections we also must filter by
+        # the canonical hostname.
+        if item.change.project.source.connection.canonical_hostname != \
+                self.connection.canonical_hostname:
+            return
+
         message = self._formatItemReport(pipeline, item)
 
         self.log.debug("Report change %s, params %s, message: %s" %
                        (item.change, self.config, message))
         changeid = '%s,%s' % (item.change.number, item.change.patchset)
-        item.change._ref_sha = source.getRefSha(
+        item.change._ref_sha = item.change.project.source.getRefSha(
             item.change.project, 'refs/heads/' + item.change.branch)
 
         return self.connection.review(item.change.project.name, changeid,
diff --git a/zuul/driver/gerrit/gerritsource.py b/zuul/driver/gerrit/gerritsource.py
index 6cb0c39..4571cc1 100644
--- a/zuul/driver/gerrit/gerritsource.py
+++ b/zuul/driver/gerrit/gerritsource.py
@@ -65,6 +65,7 @@
 
     def getRequireFilters(self, config):
         f = GerritRefFilter(
+            connection_name=self.connection.connection_name,
             open=config.get('open'),
             current_patchset=config.get('current-patchset'),
             statuses=to_list(config.get('status')),
@@ -74,6 +75,7 @@
 
     def getRejectFilters(self, config):
         f = GerritRefFilter(
+            connection_name=self.connection.connection_name,
             reject_approvals=to_list(config.get('approval')),
         )
         return [f]
diff --git a/zuul/driver/github/githubconnection.py b/zuul/driver/github/githubconnection.py
index 39a63db..6a3c09e 100644
--- a/zuul/driver/github/githubconnection.py
+++ b/zuul/driver/github/githubconnection.py
@@ -13,11 +13,17 @@
 # under the License.
 
 import collections
+import datetime
 import logging
 import hmac
 import hashlib
 import time
 
+import cachecontrol
+from cachecontrol.cache import DictCache
+import iso8601
+import jwt
+import requests
 import webob
 import webob.dec
 import voluptuous as v
@@ -29,6 +35,25 @@
 from zuul.exceptions import MergeFailure
 from zuul.driver.github.githubmodel import PullRequest, GithubTriggerEvent
 
+ACCESS_TOKEN_URL = 'https://api.github.com/installations/%s/access_tokens'
+PREVIEW_JSON_ACCEPT = 'application/vnd.github.machine-man-preview+json'
+
+
+class UTC(datetime.tzinfo):
+    """UTC"""
+
+    def utcoffset(self, dt):
+        return datetime.timedelta(0)
+
+    def tzname(self, dt):
+        return "UTC"
+
+    def dst(self, dt):
+        return datetime.timedelta(0)
+
+
+utc = UTC()
+
 
 class GithubWebhookListener():
 
@@ -66,17 +91,38 @@
             raise webob.exc.HTTPBadRequest(message)
 
         try:
-            event = method(request)
+            json_body = request.json_body
+        except:
+            message = 'Exception deserializing JSON body'
+            self.log.exception(message)
+            raise webob.exc.HTTPBadRequest(message)
+
+        # If there's any installation mapping information in the body then
+        # update the project mapping before any requests are made.
+        installation_id = json_body.get('installation', {}).get('id')
+        project_name = json_body.get('repository', {}).get('full_name')
+
+        if installation_id and project_name:
+            old_id = self.connection.installation_map.get(project_name)
+
+            if old_id and old_id != installation_id:
+                msg = "Unexpected installation_id change for %s. %d -> %d."
+                self.log.warning(msg, project_name, old_id, installation_id)
+
+            self.connection.installation_map[project_name] = installation_id
+
+        try:
+            event = method(json_body)
         except:
             self.log.exception('Exception when handling event:')
+            event = None
 
         if event:
             event.project_hostname = self.connection.canonical_hostname
             self.connection.logEvent(event)
             self.connection.sched.addEvent(event)
 
-    def _event_push(self, request):
-        body = request.json_body
+    def _event_push(self, body):
         base_repo = body.get('repository')
 
         event = GithubTriggerEvent()
@@ -96,8 +142,7 @@
 
         return event
 
-    def _event_pull_request(self, request):
-        body = request.json_body
+    def _event_pull_request(self, body):
         action = body.get('action')
         pr_body = body.get('pull_request')
 
@@ -124,9 +169,8 @@
 
         return event
 
-    def _event_issue_comment(self, request):
+    def _event_issue_comment(self, body):
         """Handles pull request comments"""
-        body = request.json_body
         action = body.get('action')
         if action != 'created':
             return
@@ -144,9 +188,8 @@
         event.action = 'comment'
         return event
 
-    def _event_pull_request_review(self, request):
+    def _event_pull_request_review(self, body):
         """Handles pull request reviews"""
-        body = request.json_body
         pr_body = body.get('pull_request')
         if pr_body is None:
             return
@@ -162,8 +205,7 @@
         event.action = body.get('action')
         return event
 
-    def _event_status(self, request):
-        body = request.json_body
+    def _event_status(self, body):
         action = body.get('action')
         if action == 'pending':
             return
@@ -277,20 +319,32 @@
     driver_name = 'github'
     log = logging.getLogger("connection.github")
     payload_path = 'payload'
-    git_user = 'git'
 
     def __init__(self, driver, connection_name, connection_config):
         super(GithubConnection, self).__init__(
             driver, connection_name, connection_config)
-        self.github = None
         self._change_cache = {}
         self.projects = {}
-        self._git_ssh = bool(self.connection_config.get('sshkey', None))
+        self.git_ssh_key = self.connection_config.get('sshkey')
         self.git_host = self.connection_config.get('git_host', 'github.com')
         self.canonical_hostname = self.connection_config.get(
             'canonical_hostname', self.git_host)
         self.source = driver.getSource(self)
 
+        self._github = None
+        self.app_id = None
+        self.app_key = None
+
+        self.installation_map = {}
+        self.installation_token_cache = {}
+
+        # NOTE(jamielennox): Better here would be to cache to memcache or file
+        # or something external - but zuul already sucks at restarting so in
+        # memory probably doesn't make this much worse.
+        self.cache_adapter = cachecontrol.CacheControlAdapter(
+            DictCache(),
+            cache_etags=True)
+
     def onLoad(self):
         webhook_listener = GithubWebhookListener(self)
         self.registerHttpHandler(self.payload_path,
@@ -300,20 +354,107 @@
     def onStop(self):
         self.unregisterHttpHandler(self.payload_path)
 
-    def _authenticateGithubAPI(self):
-        token = self.connection_config.get('api_token', None)
-        if token is not None:
-            if self.git_host != 'github.com':
-                url = 'https://%s/' % self.git_host
-                self.github = github3.enterprise_login(token=token, url=url)
-            else:
-                self.github = github3.login(token=token)
-            self.log.info("Github API Authentication successful.")
+    def _createGithubClient(self):
+        if self.git_host != 'github.com':
+            url = 'https://%s/' % self.git_host
+            github = github3.GitHubEnterprise(url)
         else:
-            self.github = None
-            self.log.info(
-                "No Github credentials found in zuul configuration, cannot "
-                "authenticate.")
+            github = github3.GitHub()
+
+        # anything going through requests to http/s goes through cache
+        github.session.mount('http://', self.cache_adapter)
+        github.session.mount('https://', self.cache_adapter)
+        return github
+
+    def _authenticateGithubAPI(self):
+        config = self.connection_config
+
+        api_token = config.get('api_token')
+
+        app_id = config.get('app_id')
+        app_key = None
+        app_key_file = config.get('app_key')
+
+        self._github = self._createGithubClient()
+
+        if api_token:
+            self._github.login(token=api_token)
+
+        if app_key_file:
+            try:
+                with open(app_key_file, 'r') as f:
+                    app_key = f.read()
+            except IOError:
+                m = "Failed to open app key file for reading: %s"
+                self.log.error(m, app_key_file)
+
+        if (app_id or app_key) and \
+                not (app_id and app_key):
+            self.log.warning("You must provide an app_id and "
+                             "app_key to use installation based "
+                             "authentication")
+
+            return
+
+        if app_id:
+            self.app_id = int(app_id)
+        if app_key:
+            self.app_key = app_key
+
+    def _get_installation_key(self, project, user_id=None):
+        installation_id = self.installation_map.get(project)
+
+        if not installation_id:
+            self.log.error("No installation ID available for project %s",
+                           project)
+            return ''
+
+        now = datetime.datetime.now(utc)
+        token, expiry = self.installation_token_cache.get(installation_id,
+                                                          (None, None))
+
+        if ((not expiry) or (not token) or (now >= expiry)):
+            expiry = now + datetime.timedelta(minutes=5)
+
+            data = {'iat': now, 'exp': expiry, 'iss': self.app_id}
+            app_token = jwt.encode(data,
+                                   self.app_key,
+                                   algorithm='RS256')
+
+            url = ACCESS_TOKEN_URL % installation_id
+            headers = {'Accept': PREVIEW_JSON_ACCEPT,
+                       'Authorization': 'Bearer %s' % app_token}
+            json_data = {'user_id': user_id} if user_id else None
+
+            response = requests.post(url, headers=headers, json=json_data)
+            response.raise_for_status()
+
+            data = response.json()
+
+            expiry = iso8601.parse_date(data['expires_at'])
+            expiry -= datetime.timedelta(minutes=2)
+            token = data['token']
+
+            self.installation_token_cache[installation_id] = (token, expiry)
+
+        return token
+
+    def getGithubClient(self,
+                        project=None,
+                        user_id=None,
+                        use_app=True):
+        # if you're authenticating for a project and you're an integration then
+        # you need to use the installation specific token. There are some
+        # operations that are not yet supported by integrations so
+        # use_app lets you use api_key auth.
+        if use_app and project and self.app_id:
+            github = self._createGithubClient()
+            github.login(token=self._get_installation_key(project, user_id))
+            return github
+
+        # if we're using api_key authentication then this is already token
+        # authenticated, if not then anonymous is the best we have.
+        return self._github
 
     def maintainCache(self, relevant):
         for key, change in self._change_cache.items():
@@ -338,6 +479,10 @@
             change.status = self._get_statuses(project, event.patch_number)
             change.reviews = self.getPullReviews(project, change.number)
             change.source_event = event
+            change.open = self.getPullOpen(event.project_name, change.number)
+            change.is_current_patchset = self.getIsCurrent(event.project_name,
+                                                           change.number,
+                                                           event.patch_number)
         elif event.ref:
             change = Ref(project)
             change.ref = event.ref
@@ -350,12 +495,16 @@
         return change
 
     def getGitUrl(self, project):
-        if self._git_ssh:
-            url = 'ssh://%s@%s/%s.git' % \
-                (self.git_user, self.git_host, project)
-        else:
-            url = 'https://%s/%s' % (self.git_host, project)
-        return url
+        if self.git_ssh_key:
+            return 'ssh://git@%s/%s.git' % (self.git_host, project)
+
+        if self.app_id:
+            installation_key = self._get_installation_key(project)
+            return 'https://x-access-token:%s@%s/%s' % (installation_key,
+                                                        self.git_host,
+                                                        project)
+
+        return 'https://%s/%s' % (self.git_host, project)
 
     def getGitwebUrl(self, project, sha=None):
         url = 'https://%s/%s' % (self.git_host, project)
@@ -370,19 +519,21 @@
         self.projects[project.name] = project
 
     def getProjectBranches(self, project):
+        github = self.getGithubClient()
         owner, proj = project.name.split('/')
-        repository = self.github.repository(owner, proj)
+        repository = github.repository(owner, proj)
         branches = [branch.name for branch in repository.branches()]
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
         return branches
 
     def getPullUrl(self, project, number):
         return '%s/pull/%s' % (self.getGitwebUrl(project), number)
 
     def getPull(self, project_name, number):
+        github = self.getGithubClient(project_name)
         owner, proj = project_name.split('/')
-        pr = self.github.pull_request(owner, proj, number).as_dict()
-        log_rate_limit(self.log, self.github)
+        pr = github.pull_request(owner, proj, number).as_dict()
+        log_rate_limit(self.log, github)
         return pr
 
     def canMerge(self, change, allow_needs):
@@ -401,20 +552,22 @@
     def getPullBySha(self, sha):
         query = '%s type:pr is:open' % sha
         pulls = []
-        for issue in self.github.search_issues(query=query):
-            pr_url = issue.pull_request.get('url')
+        github = self.getGithubClient()
+        for issue in github.search_issues(query=query):
+            pr_url = issue.issue.pull_request().as_dict().get('url')
             if not pr_url:
                 continue
             # the issue provides no good description of the project :\
             owner, project, _, number = pr_url.split('/')[4:]
-            pr = self.github.pull_request(owner, project, number)
+            github = self.getGithubClient("%s/%s" % (owner, project))
+            pr = github.pull_request(owner, project, number)
             if pr.head.sha != sha:
                 continue
             if pr.as_dict() in pulls:
                 continue
             pulls.append(pr.as_dict())
 
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
         if len(pulls) > 1:
             raise Exception('Multiple pulls found with head sha %s' % sha)
 
@@ -423,10 +576,11 @@
         return pulls.pop()
 
     def getPullFileNames(self, project, number):
+        github = self.getGithubClient(project)
         owner, proj = project.name.split('/')
         filenames = [f.filename for f in
-                     self.github.pull_request(owner, proj, number).files()]
-        log_rate_limit(self.log, self.github)
+                     github.pull_request(owner, proj, number).files()]
+        log_rate_limit(self.log, github)
         return filenames
 
     def getPullReviews(self, project, number):
@@ -471,33 +625,38 @@
     def _getPullReviews(self, owner, project, number):
         # make a list out of the reviews so that we complete our
         # API transaction
+        # reviews are not yet supported by integrations, use api_key:
+        # https://platform.github.community/t/api-endpoint-for-pr-reviews/409
+        github = self.getGithubClient("%s/%s" % (owner, project),
+                                      use_app=False)
         reviews = [review.as_dict() for review in
-                   self.github.pull_request(owner, project, number).reviews()]
+                   github.pull_request(owner, project, number).reviews()]
 
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
         return reviews
 
     def getUser(self, login):
-        return GithubUser(self.github, login)
+        return GithubUser(self.getGithubClient(), login)
 
     def getUserUri(self, login):
         return 'https://%s/%s' % (self.git_host, login)
 
     def getRepoPermission(self, project, login):
+        github = self.getGithubClient(project)
         owner, proj = project.split('/')
         # This gets around a missing API call
         # need preview header
         headers = {'Accept': 'application/vnd.github.korra-preview'}
 
         # Create a repo object
-        repository = self.github.repository(owner, proj)
+        repository = github.repository(owner, project)
         # Build up a URL
         url = repository._build_url('collaborators', login, 'permission',
                                     base_url=repository._api)
         # Get the data
         perms = repository._get(url, headers=headers)
 
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
 
         # no known user, maybe deleted since review?
         if perms.status_code == 404:
@@ -507,53 +666,67 @@
         return perms.json()['permission']
 
     def commentPull(self, project, pr_number, message):
+        github = self.getGithubClient(project)
         owner, proj = project.split('/')
-        repository = self.github.repository(owner, proj)
+        repository = github.repository(owner, proj)
         pull_request = repository.issue(pr_number)
         pull_request.create_comment(message)
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
 
     def mergePull(self, project, pr_number, commit_message='', sha=None):
+        github = self.getGithubClient(project)
         owner, proj = project.split('/')
-        pull_request = self.github.pull_request(owner, proj, pr_number)
+        pull_request = github.pull_request(owner, proj, pr_number)
         try:
             result = pull_request.merge(commit_message=commit_message, sha=sha)
         except MethodNotAllowed as e:
             raise MergeFailure('Merge was not successful due to mergeability'
                                ' conflict, original error is %s' % e)
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
         if not result:
             raise Exception('Pull request was not merged')
 
     def getCommitStatuses(self, project, sha):
+        github = self.getGithubClient(project)
         owner, proj = project.split('/')
-        repository = self.github.repository(owner, proj)
+        repository = github.repository(owner, proj)
         commit = repository.commit(sha)
         # make a list out of the statuses so that we complete our
         # API transaction
         statuses = [status.as_dict() for status in commit.statuses()]
 
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
         return statuses
 
     def setCommitStatus(self, project, sha, state, url='', description='',
                         context=''):
+        github = self.getGithubClient(project)
         owner, proj = project.split('/')
-        repository = self.github.repository(owner, proj)
+        repository = github.repository(owner, proj)
         repository.create_status(sha, state, url, description, context)
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
 
     def labelPull(self, project, pr_number, label):
+        github = self.getGithubClient(project)
         owner, proj = project.split('/')
-        pull_request = self.github.issue(owner, proj, pr_number)
+        pull_request = github.issue(owner, proj, pr_number)
         pull_request.add_labels(label)
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
 
     def unlabelPull(self, project, pr_number, label):
+        github = self.getGithubClient(project)
         owner, proj = project.split('/')
-        pull_request = self.github.issue(owner, proj, pr_number)
+        pull_request = github.issue(owner, proj, pr_number)
         pull_request.remove_label(label)
-        log_rate_limit(self.log, self.github)
+        log_rate_limit(self.log, github)
+
+    def getPullOpen(self, project, number):
+        pr = self.getPull(project, number)
+        return pr.get('state') == 'open'
+
+    def getIsCurrent(self, project, number, sha):
+        pr = self.getPull(project, number)
+        return pr.get('head').get('sha') == sha
 
     def _ghTimestampToDate(self, timestamp):
         return time.strptime(timestamp, '%Y-%m-%dT%H:%M:%SZ')
diff --git a/zuul/driver/github/githubmodel.py b/zuul/driver/github/githubmodel.py
index bbacc9b..9516097 100644
--- a/zuul/driver/github/githubmodel.py
+++ b/zuul/driver/github/githubmodel.py
@@ -59,10 +59,11 @@
         return False
 
 
-class GithubReviewFilter(object):
-    def __init__(self, required_reviews=[]):
+class GithubCommonFilter(object):
+    def __init__(self, required_reviews=[], required_statuses=[]):
         self._required_reviews = copy.deepcopy(required_reviews)
         self.required_reviews = self._tidy_reviews(required_reviews)
+        self.required_statuses = required_statuses
 
     def _tidy_reviews(self, reviews):
         for r in reviews:
@@ -108,9 +109,13 @@
         return True
 
     def matchesReviews(self, change):
-        if self.required_reviews and not change.reviews:
-            # No reviews means no matching
-            return False
+        if self.required_reviews:
+            if not hasattr(change, 'number'):
+                # not a PR, no reviews
+                return False
+            if not change.reviews:
+                # No reviews means no matching
+                return False
 
         return self.matchesRequiredReviews(change)
 
@@ -126,14 +131,30 @@
                 return False
         return True
 
+    def matchesRequiredStatuses(self, change):
+        # statuses are ORed
+        # A PR head can have multiple statuses on it. If the change
+        # statuses and the filter statuses are a null intersection, there
+        # are no matches and we return false
+        if self.required_statuses:
+            if not hasattr(change, 'number'):
+                # not a PR, no status
+                return False
+            if set(change.status).isdisjoint(set(self.required_statuses)):
+                return False
+        return True
 
-class GithubEventFilter(EventFilter):
+
+class GithubEventFilter(EventFilter, GithubCommonFilter):
     def __init__(self, trigger, types=[], branches=[], refs=[],
                  comments=[], actions=[], labels=[], unlabels=[],
-                 states=[], statuses=[], ignore_deletes=True):
+                 states=[], statuses=[], required_statuses=[],
+                 ignore_deletes=True):
 
         EventFilter.__init__(self, trigger)
 
+        GithubCommonFilter.__init__(self, required_statuses=required_statuses)
+
         self._types = types
         self._branches = branches
         self._refs = refs
@@ -147,6 +168,7 @@
         self.unlabels = unlabels
         self.states = states
         self.statuses = statuses
+        self.required_statuses = required_statuses
         self.ignore_deletes = ignore_deletes
 
     def __repr__(self):
@@ -172,6 +194,8 @@
             ret += ' states: %s' % ', '.join(self.states)
         if self.statuses:
             ret += ' statuses: %s' % ', '.join(self.statuses)
+        if self.required_statuses:
+            ret += ' required_statuses: %s' % ', '.join(self.required_statuses)
         ret += '>'
 
         return ret
@@ -239,36 +263,61 @@
         if self.statuses and event.status not in self.statuses:
             return False
 
+        if not self.matchesRequiredStatuses(change):
+            return False
+
         return True
 
 
-class GithubRefFilter(RefFilter, GithubReviewFilter):
-    def __init__(self, statuses=[], required_reviews=[]):
-        RefFilter.__init__(self)
+class GithubRefFilter(RefFilter, GithubCommonFilter):
+    def __init__(self, connection_name, statuses=[], required_reviews=[],
+                 open=None, current_patchset=None):
+        RefFilter.__init__(self, connection_name)
 
-        GithubReviewFilter.__init__(self, required_reviews=required_reviews)
+        GithubCommonFilter.__init__(self, required_reviews=required_reviews,
+                                    required_statuses=statuses)
         self.statuses = statuses
+        self.open = open
+        self.current_patchset = current_patchset
 
     def __repr__(self):
         ret = '<GithubRefFilter'
 
+        ret += ' connection_name: %s' % self.connection_name
         if self.statuses:
             ret += ' statuses: %s' % ', '.join(self.statuses)
         if self.required_reviews:
             ret += (' required-reviews: %s' %
                     str(self.required_reviews))
+        if self.open:
+            ret += ' open: %s' % self.open
+        if self.current_patchset:
+            ret += ' current-patchset: %s' % self.current_patchset
 
         ret += '>'
 
         return ret
 
     def matches(self, change):
-        # statuses are ORed
-        # A PR head can have multiple statuses on it. If the change
-        # statuses and the filter statuses are a null intersection, there
-        # are no matches and we return false
-        if self.statuses:
-            if set(change.status).isdisjoint(set(self.statuses)):
+        if not self.matchesRequiredStatuses(change):
+            return False
+
+        if self.open is not None:
+            # if a "change" has no number, it's not a change, but a push
+            # and cannot possibly pass this test.
+            if hasattr(change, 'number'):
+                if self.open != change.open:
+                    return False
+            else:
+                return False
+
+        if self.current_patchset is not None:
+            # if a "change" has no number, it's not a change, but a push
+            # and cannot possibly pass this test.
+            if hasattr(change, 'number'):
+                if self.current_patchset != change.is_current_patchset:
+                    return False
+            else:
                 return False
 
         # required reviews are ANDed
diff --git a/zuul/driver/github/githubreporter.py b/zuul/driver/github/githubreporter.py
index 9975cbc..fc3b64d 100644
--- a/zuul/driver/github/githubreporter.py
+++ b/zuul/driver/github/githubreporter.py
@@ -18,6 +18,7 @@
 
 from zuul.reporter import BaseReporter
 from zuul.exceptions import MergeFailure
+from zuul.driver.util import scalar_or_list
 
 
 class GithubReporter(BaseReporter):
@@ -38,7 +39,7 @@
         if not isinstance(self._unlabels, list):
             self._unlabels = [self._unlabels]
 
-    def report(self, source, pipeline, item):
+    def report(self, pipeline, item):
         """Comment on PR and set commit status."""
         if self._create_comment:
             self.addPullComment(pipeline, item)
@@ -67,14 +68,16 @@
     def setPullStatus(self, pipeline, item):
         project = item.change.project.name
         sha = item.change.patchset
-        context = pipeline.name
+        context = '%s/%s' % (pipeline.layout.tenant.name, pipeline.name)
         state = self._commit_status
-        url = ''
-        if self.connection.sched.config.has_option('zuul', 'status_url'):
-            base = self.connection.sched.config.get('zuul', 'status_url')
-            url = '%s/#%s,%s' % (base,
-                                 item.change.number,
-                                 item.change.patchset)
+
+        url_pattern = self.config.get('status-url')
+        if not url_pattern:
+            sched_config = self.connection.sched.config
+            if sched_config.has_option('zuul', 'status_url'):
+                url_pattern = sched_config.get('zuul', 'status_url')
+        url = item.formatUrlPattern(url_pattern) if url_pattern else ''
+
         description = ''
         if pipeline.description:
             description = pipeline.description
@@ -102,12 +105,12 @@
                 item.change.is_merged = True
                 return
             except MergeFailure:
-                self.log.debug(
+                self.log.exception(
                     'Merge attempt of change %s  %s/2 failed.' %
-                    (i, item.change))
+                    (item.change, i), exc_info=True)
                 if i == 1:
                     time.sleep(2)
-        self.log.debug(
+        self.log.warning(
             'Merge of change %s failed after 2 attempts, giving up' %
             item.change)
 
@@ -154,14 +157,12 @@
 
 
 def getSchema():
-    def toList(x):
-        return v.Any([x], x)
-
     github_reporter = v.Schema({
         'status': v.Any('pending', 'success', 'failure'),
+        'status-url': str,
         'comment': bool,
         'merge': bool,
-        'label': toList(str),
-        'unlabel': toList(str)
+        'label': scalar_or_list(str),
+        'unlabel': scalar_or_list(str)
     })
     return github_reporter
diff --git a/zuul/driver/github/githubsource.py b/zuul/driver/github/githubsource.py
index 0aada4d..1350b10 100644
--- a/zuul/driver/github/githubsource.py
+++ b/zuul/driver/github/githubsource.py
@@ -96,8 +96,11 @@
 
     def getRequireFilters(self, config):
         f = GithubRefFilter(
+            connection_name=self.connection.connection_name,
             statuses=to_list(config.get('status')),
             required_reviews=to_list(config.get('review')),
+            open=config.get('open'),
+            current_patchset=config.get('current-patchset'),
         )
         return [f]
 
@@ -116,7 +119,9 @@
 
 def getRequireSchema():
     require = {'status': scalar_or_list(str),
-               'review': scalar_or_list(review)}
+               'review': scalar_or_list(review),
+               'open': bool,
+               'current-patchset': bool}
     return require
 
 
diff --git a/zuul/driver/github/githubtrigger.py b/zuul/driver/github/githubtrigger.py
index 3269c36..328879d 100644
--- a/zuul/driver/github/githubtrigger.py
+++ b/zuul/driver/github/githubtrigger.py
@@ -16,6 +16,7 @@
 import voluptuous as v
 from zuul.trigger import BaseTrigger
 from zuul.driver.github.githubmodel import GithubEventFilter
+from zuul.driver.util import scalar_or_list, to_list
 
 
 class GithubTrigger(BaseTrigger):
@@ -23,26 +24,20 @@
     log = logging.getLogger("zuul.trigger.GithubTrigger")
 
     def getEventFilters(self, trigger_config):
-        def toList(item):
-            if not item:
-                return []
-            if isinstance(item, list):
-                return item
-            return [item]
-
         efilters = []
-        for trigger in toList(trigger_config):
+        for trigger in to_list(trigger_config):
             f = GithubEventFilter(
                 trigger=self,
-                types=toList(trigger['event']),
-                actions=toList(trigger.get('action')),
-                branches=toList(trigger.get('branch')),
-                refs=toList(trigger.get('ref')),
-                comments=toList(trigger.get('comment')),
-                labels=toList(trigger.get('label')),
-                unlabels=toList(trigger.get('unlabel')),
-                states=toList(trigger.get('state')),
-                statuses=toList(trigger.get('status'))
+                types=to_list(trigger['event']),
+                actions=to_list(trigger.get('action')),
+                branches=to_list(trigger.get('branch')),
+                refs=to_list(trigger.get('ref')),
+                comments=to_list(trigger.get('comment')),
+                labels=to_list(trigger.get('label')),
+                unlabels=to_list(trigger.get('unlabel')),
+                states=to_list(trigger.get('state')),
+                statuses=to_list(trigger.get('status')),
+                required_statuses=to_list(trigger.get('require-status'))
             )
             efilters.append(f)
 
@@ -53,22 +48,20 @@
 
 
 def getSchema():
-    def toList(x):
-        return v.Any([x], x)
-
     github_trigger = {
         v.Required('event'):
-            toList(v.Any('pull_request',
-                         'pull_request_review',
-                         'push')),
-        'action': toList(str),
-        'branch': toList(str),
-        'ref': toList(str),
-        'comment': toList(str),
-        'label': toList(str),
-        'unlabel': toList(str),
-        'state': toList(str),
-        'status': toList(str)
+            scalar_or_list(v.Any('pull_request',
+                                 'pull_request_review',
+                                 'push')),
+        'action': scalar_or_list(str),
+        'branch': scalar_or_list(str),
+        'ref': scalar_or_list(str),
+        'comment': scalar_or_list(str),
+        'label': scalar_or_list(str),
+        'unlabel': scalar_or_list(str),
+        'state': scalar_or_list(str),
+        'require-status': scalar_or_list(str),
+        'status': scalar_or_list(str)
     }
 
     return github_trigger
diff --git a/zuul/driver/nullwrap/__init__.py b/zuul/driver/nullwrap/__init__.py
new file mode 100644
index 0000000..ebcd1da
--- /dev/null
+++ b/zuul/driver/nullwrap/__init__.py
@@ -0,0 +1,28 @@
+# Copyright 2012 Hewlett-Packard Development Company, L.P.
+# Copyright 2013 OpenStack Foundation
+# Copyright 2016 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import subprocess
+
+from zuul.driver import (Driver, WrapperInterface)
+
+
+class NullwrapDriver(Driver, WrapperInterface):
+    name = 'nullwrap'
+    log = logging.getLogger("zuul.NullwrapDriver")
+
+    def getPopen(self, **kwargs):
+        return subprocess.Popen
diff --git a/zuul/driver/smtp/smtpreporter.py b/zuul/driver/smtp/smtpreporter.py
index dd618ef..35eb69f 100644
--- a/zuul/driver/smtp/smtpreporter.py
+++ b/zuul/driver/smtp/smtpreporter.py
@@ -24,7 +24,7 @@
     name = 'smtp'
     log = logging.getLogger("zuul.SMTPReporter")
 
-    def report(self, source, pipeline, item):
+    def report(self, pipeline, item):
         """Send the compiled report message via smtp."""
         message = self._formatItemReport(pipeline, item)
 
diff --git a/zuul/driver/sql/sqlreporter.py b/zuul/driver/sql/sqlreporter.py
index d6e547d..349abe8 100644
--- a/zuul/driver/sql/sqlreporter.py
+++ b/zuul/driver/sql/sqlreporter.py
@@ -31,7 +31,7 @@
         # TODO(jeblair): document this is stored as NULL if unspecified
         self.result_score = config.get('score', None)
 
-    def report(self, source, pipeline, item):
+    def report(self, pipeline, item):
         """Create an entry into a database."""
 
         if not self.connection.tables_established:
@@ -39,13 +39,16 @@
             return
 
         with self.connection.engine.begin() as conn:
+            change = getattr(item.change, 'number', '')
+            patchset = getattr(item.change, 'patchset', '')
+            refspec = getattr(item.change, 'refspec', item.change.newrev)
             buildset_ins = self.connection.zuul_buildset_table.insert().values(
                 zuul_ref=item.current_build_set.ref,
                 pipeline=item.pipeline.name,
                 project=item.change.project.name,
-                change=item.change.number,
-                patchset=item.change.patchset,
-                ref=item.change.refspec,
+                change=change,
+                patchset=patchset,
+                ref=refspec,
                 score=self.result_score,
                 message=self._formatItemReport(
                     pipeline, item, with_jobs=False),
diff --git a/zuul/executor/client.py b/zuul/executor/client.py
index e1eed2d..5a1820e 100644
--- a/zuul/executor/client.py
+++ b/zuul/executor/client.py
@@ -169,7 +169,8 @@
         self.log.debug("Function %s is not registered" % name)
         return False
 
-    def execute(self, job, item, pipeline, dependent_items=[]):
+    def execute(self, job, item, pipeline, dependent_items=[],
+                merger_items=[]):
         tenant = pipeline.layout.tenant
         uuid = str(uuid4().hex)
         self.log.info(
@@ -179,8 +180,11 @@
                 item.current_build_set.getJobNodeSet(job.name),
                 item.change,
                 [x.change for x in dependent_items]))
+
         dependent_items = dependent_items[:]
         dependent_items.reverse()
+        all_items = dependent_items + [item]
+
         # TODOv3(jeblair): This ansible vars data structure will
         # replace the environment variables below.
         project = dict(
@@ -210,7 +214,7 @@
             changes_str = '^'.join(
                 ['%s:%s:%s' % (i.change.project.name, i.change.branch,
                                i.change.refspec)
-                 for i in dependent_items + [item]])
+                 for i in all_items])
             params['ZUUL_BRANCH'] = item.change.branch
             params['ZUUL_CHANGES'] = changes_str
             params['ZUUL_REF'] = ('refs/zuul/%s/%s' %
@@ -220,7 +224,7 @@
 
             zuul_changes = ' '.join(['%s,%s' % (i.change.number,
                                                 i.change.patchset)
-                                     for i in dependent_items + [item]])
+                                     for i in all_items])
             params['ZUUL_CHANGE_IDS'] = zuul_changes
             params['ZUUL_CHANGE'] = str(item.change.number)
             params['ZUUL_PATCHSET'] = str(item.change.patchset)
@@ -253,13 +257,16 @@
         # ZUUL_OLDREV
         # ZUUL_NEWREV
 
-        all_items = dependent_items + [item]
-        merger_items = [i.makeMergerItem() for i in all_items]
-
         params['job'] = job.name
         params['timeout'] = job.timeout
         params['items'] = merger_items
         params['projects'] = []
+        if hasattr(item.change, 'branch'):
+            params['branch'] = item.change.branch
+        else:
+            params['branch'] = None
+        params['override_branch'] = job.override_branch
+        params['repo_state'] = item.current_build_set.repo_state
 
         if job.name != 'noop':
             params['playbooks'] = [x.toDict() for x in job.run]
@@ -284,21 +291,36 @@
                 params['vars'][secret.name] = copy.deepcopy(secret.secret_data)
         params['vars']['zuul'] = zuul_params
         projects = set()
-        if job.repos:
-            for repo in job.repos:
-                (trusted, project) = tenant.getProject(repo)
-                connection = project.source.connection
+
+        def make_project_dict(project, override_branch=None):
+            project_config = item.current_build_set.layout.project_configs.get(
+                project.canonical_name, None)
+            if project_config:
+                project_default_branch = project_config.default_branch
+            else:
+                project_default_branch = 'master'
+            connection = project.source.connection
+            return dict(connection=connection.connection_name,
+                        name=project.name,
+                        canonical_name=project.canonical_name,
+                        override_branch=override_branch,
+                        default_branch=project_default_branch)
+
+        if job.required_projects:
+            for job_project in job.required_projects.values():
+                (trusted, project) = tenant.getProject(
+                    job_project.project_name)
+                if project is None:
+                    raise Exception("Unknown project %s" %
+                                    (job_project.project_name,))
                 params['projects'].append(
-                    dict(connection=connection.connection_name,
-                         name=project.name))
+                    make_project_dict(project,
+                                      job_project.override_branch))
                 projects.add(project)
         for item in all_items:
             if item.change.project not in projects:
                 project = item.change.project
-                connection = item.change.project.source.connection
-                params['projects'].append(
-                    dict(connection=connection.connection_name,
-                         name=project.name))
+                params['projects'].append(make_project_dict(project))
                 projects.add(project)
 
         build = Build(job, uuid)
diff --git a/zuul/executor/server.py b/zuul/executor/server.py
index 99d2a9c..fd7ebbe 100644
--- a/zuul/executor/server.py
+++ b/zuul/executor/server.py
@@ -27,14 +27,10 @@
 from zuul.lib.yamlutil import yaml
 
 import gear
-import git
 from six.moves import shlex_quote
 
 import zuul.merger.merger
-import zuul.ansible.action
-import zuul.ansible.callback
-import zuul.ansible.library
-import zuul.ansible.lookup
+import zuul.ansible
 from zuul.lib import commandsocket
 
 COMMANDS = ['stop', 'pause', 'unpause', 'graceful', 'verbose',
@@ -79,8 +75,88 @@
         self.path = None
 
 
+class SshAgent(object):
+    log = logging.getLogger("zuul.ExecutorServer")
+
+    def __init__(self):
+        self.env = {}
+        self.ssh_agent = None
+
+    def start(self):
+        if self.ssh_agent:
+            return
+        with open('/dev/null', 'r+') as devnull:
+            ssh_agent = subprocess.Popen(['ssh-agent'], close_fds=True,
+                                         stdout=subprocess.PIPE,
+                                         stderr=devnull,
+                                         stdin=devnull)
+        (output, _) = ssh_agent.communicate()
+        output = output.decode('utf8')
+        for line in output.split("\n"):
+            if '=' in line:
+                line = line.split(";", 1)[0]
+                (key, value) = line.split('=')
+                self.env[key] = value
+        self.log.info('Started SSH Agent, {}'.format(self.env))
+
+    def stop(self):
+        if 'SSH_AGENT_PID' in self.env:
+            try:
+                os.kill(int(self.env['SSH_AGENT_PID']), signal.SIGTERM)
+            except OSError:
+                self.log.exception(
+                    'Problem sending SIGTERM to agent {}'.format(self.env))
+            self.log.info('Sent SIGTERM to SSH Agent, {}'.format(self.env))
+            self.env = {}
+
+    def add(self, key_path):
+        env = os.environ.copy()
+        env.update(self.env)
+        key_path = os.path.expanduser(key_path)
+        self.log.debug('Adding SSH Key {}'.format(key_path))
+        output = ''
+        try:
+            output = subprocess.check_output(['ssh-add', key_path], env=env,
+                                             stderr=subprocess.PIPE)
+        except subprocess.CalledProcessError:
+            self.log.error('ssh-add failed: {}'.format(output))
+            raise
+        self.log.info('Added SSH Key {}'.format(key_path))
+
+    def remove(self, key_path):
+        env = os.environ.copy()
+        env.update(self.env)
+        key_path = os.path.expanduser(key_path)
+        self.log.debug('Removing SSH Key {}'.format(key_path))
+        subprocess.check_output(['ssh-add', '-d', key_path], env=env,
+                                stderr=subprocess.PIPE)
+        self.log.info('Removed SSH Key {}'.format(key_path))
+
+    def list(self):
+        if 'SSH_AUTH_SOCK' not in self.env:
+            return None
+        env = os.environ.copy()
+        env.update(self.env)
+        result = []
+        for line in subprocess.Popen(['ssh-add', '-L'], env=env,
+                                     stdout=subprocess.PIPE).stdout:
+            line = line.decode('utf8')
+            if line.strip() == 'The agent has no identities.':
+                break
+            result.append(line.strip())
+        return result
+
+
 class JobDir(object):
-    def __init__(self, root=None, keep=False):
+    def __init__(self, root, keep, build_uuid):
+        '''
+        :param str root: Root directory for the individual job directories.
+            Can be None to use the default system temp root directory.
+        :param bool keep: If True, do not delete the job directory.
+        :param str build_uuid: The unique build UUID. If supplied, this will
+            be used as the temp job directory name. Using this will help the
+            log streaming daemon find job logs.
+        '''
         # root
         #   ansible
         #     trusted.cfg
@@ -89,7 +165,12 @@
         #     src
         #     logs
         self.keep = keep
-        self.root = tempfile.mkdtemp(dir=root)
+        if root:
+            tmpdir = root
+        else:
+            tmpdir = tempfile.gettempdir()
+        self.root = os.path.join(tmpdir, build_uuid)
+        os.mkdir(self.root, 0o700)
         # Work
         self.work_root = os.path.join(self.root, 'work')
         os.makedirs(self.work_root)
@@ -168,7 +249,7 @@
         self.event = threading.Event()
 
     def __eq__(self, other):
-        if (other.connection_name == self.connection_name and
+        if (other and other.connection_name == self.connection_name and
             other.project_name == self.project_name):
             return True
         return False
@@ -222,6 +303,8 @@
 def _copy_ansible_files(python_module, target_dir):
         library_path = os.path.dirname(os.path.abspath(python_module.__file__))
         for fn in os.listdir(library_path):
+            if fn == "__pycache__":
+                continue
             full_path = os.path.join(library_path, fn)
             if os.path.isdir(full_path):
                 shutil.copytree(full_path, os.path.join(target_dir, fn))
@@ -229,6 +312,20 @@
                 shutil.copy(os.path.join(library_path, fn), target_dir)
 
 
+class ExecutorMergeWorker(gear.TextWorker):
+    def __init__(self, executor_server, *args, **kw):
+        self.zuul_executor_server = executor_server
+        super(ExecutorMergeWorker, self).__init__(*args, **kw)
+
+    def handleNoop(self, packet):
+        # Wait until the update queue is empty before responding
+        while self.zuul_executor_server.update_queue.qsize():
+            time.sleep(1)
+
+        with self.zuul_executor_server.merger_lock:
+            super(ExecutorMergeWorker, self).handleNoop(packet)
+
+
 class ExecutorServer(object):
     log = logging.getLogger("zuul.ExecutorServer")
 
@@ -241,6 +338,7 @@
         # perhaps hostname+pid.
         self.hostname = socket.gethostname()
         self.zuul_url = config.get('merger', 'zuul_url')
+        self.merger_lock = threading.Lock()
         self.command_map = dict(
             stop=self.stop,
             pause=self.pause,
@@ -265,6 +363,13 @@
         else:
             self.merge_name = None
 
+        if self.config.has_option('executor', 'untrusted_wrapper'):
+            untrusted_wrapper_name = self.config.get(
+                'executor', 'untrusted_wrapper').split()
+        else:
+            untrusted_wrapper_name = 'bubblewrap'
+        self.untrusted_wrapper = connections.drivers[untrusted_wrapper_name]
+
         self.connections = connections
         # This merger and its git repos are used to maintain
         # up-to-date copies of all the repos that are used by jobs, as
@@ -281,31 +386,38 @@
         path = os.path.join(state_dir, 'executor.socket')
         self.command_socket = commandsocket.CommandSocket(path)
         ansible_dir = os.path.join(state_dir, 'ansible')
-        self.library_dir = os.path.join(ansible_dir, 'library')
-        if not os.path.exists(self.library_dir):
-            os.makedirs(self.library_dir)
-        self.action_dir = os.path.join(ansible_dir, 'action')
-        if not os.path.exists(self.action_dir):
-            os.makedirs(self.action_dir)
+        self.ansible_dir = ansible_dir
 
-        self.callback_dir = os.path.join(ansible_dir, 'callback')
-        if not os.path.exists(self.callback_dir):
-            os.makedirs(self.callback_dir)
+        zuul_dir = os.path.join(ansible_dir, 'zuul')
+        plugin_dir = os.path.join(zuul_dir, 'ansible')
 
-        self.lookup_dir = os.path.join(ansible_dir, 'lookup')
-        if not os.path.exists(self.lookup_dir):
-            os.makedirs(self.lookup_dir)
+        if not os.path.exists(plugin_dir):
+            os.makedirs(plugin_dir)
 
-        _copy_ansible_files(zuul.ansible.library, self.library_dir)
-        _copy_ansible_files(zuul.ansible.action, self.action_dir)
-        _copy_ansible_files(zuul.ansible.callback, self.callback_dir)
-        _copy_ansible_files(zuul.ansible.lookup, self.lookup_dir)
+        self.library_dir = os.path.join(plugin_dir, 'library')
+        self.action_dir = os.path.join(plugin_dir, 'action')
+        self.callback_dir = os.path.join(plugin_dir, 'callback')
+        self.lookup_dir = os.path.join(plugin_dir, 'lookup')
+
+        _copy_ansible_files(zuul.ansible, plugin_dir)
+
+        # We're copying zuul.ansible.* into a directory we are going
+        # to add to pythonpath, so our plugins can "import
+        # zuul.ansible".  But we're not installing all of zuul, so
+        # create a __init__.py file for the stub "zuul" module.
+        with open(os.path.join(zuul_dir, '__init__.py'), 'w'):
+            pass
 
         self.job_workers = {}
 
-    def _getMerger(self, root):
+    def _getMerger(self, root, logger=None):
+        if root != self.merge_root:
+            cache_root = self.merge_root
+        else:
+            cache_root = None
         return zuul.merger.merger.Merger(root, self.connections,
-                                         self.merge_email, self.merge_name)
+                                         self.merge_email, self.merge_name,
+                                         cache_root, logger)
 
     def start(self):
         self._running = True
@@ -315,10 +427,13 @@
             port = self.config.get('gearman', 'port')
         else:
             port = 4730
-        self.worker = gear.TextWorker('Zuul Executor Server')
-        self.worker.addServer(server, port)
+        self.merger_worker = ExecutorMergeWorker(self, 'Zuul Executor Merger')
+        self.merger_worker.addServer(server, port)
+        self.executor_worker = gear.TextWorker('Zuul Executor Server')
+        self.executor_worker.addServer(server, port)
         self.log.debug("Waiting for server")
-        self.worker.waitForServer()
+        self.merger_worker.waitForServer()
+        self.executor_worker.waitForServer()
         self.log.debug("Registering")
         self.register()
 
@@ -332,15 +447,19 @@
         self.update_thread = threading.Thread(target=self._updateLoop)
         self.update_thread.daemon = True
         self.update_thread.start()
-        self.thread = threading.Thread(target=self.run)
-        self.thread.daemon = True
-        self.thread.start()
+        self.merger_thread = threading.Thread(target=self.run_merger)
+        self.merger_thread.daemon = True
+        self.merger_thread.start()
+        self.executor_thread = threading.Thread(target=self.run_executor)
+        self.executor_thread.daemon = True
+        self.executor_thread.start()
 
     def register(self):
-        self.worker.registerFunction("executor:execute")
-        self.worker.registerFunction("executor:stop:%s" % self.hostname)
-        self.worker.registerFunction("merger:merge")
-        self.worker.registerFunction("merger:cat")
+        self.executor_worker.registerFunction("executor:execute")
+        self.executor_worker.registerFunction("executor:stop:%s" %
+                                              self.hostname)
+        self.merger_worker.registerFunction("merger:merge")
+        self.merger_worker.registerFunction("merger:cat")
 
     def stop(self):
         self.log.debug("Stopping")
@@ -355,7 +474,8 @@
             except Exception:
                 self.log.exception("Exception sending stop command "
                                    "to worker:")
-        self.worker.shutdown()
+        self.merger_worker.shutdown()
+        self.executor_worker.shutdown()
         self.log.debug("Stopped")
 
     def pause(self):
@@ -380,7 +500,8 @@
 
     def join(self):
         self.update_thread.join()
-        self.thread.join()
+        self.merger_thread.join()
+        self.executor_thread.join()
 
     def runCommand(self):
         while self._command_running:
@@ -404,11 +525,12 @@
         if task is None:
             # We are asked to stop
             return
-        self.log.info("Updating repo %s/%s" % (
-            task.connection_name, task.project_name))
-        self.merger.updateRepo(task.connection_name, task.project_name)
-        self.log.debug("Finished updating repo %s/%s" %
-                       (task.connection_name, task.project_name))
+        with self.merger_lock:
+            self.log.info("Updating repo %s/%s" % (
+                task.connection_name, task.project_name))
+            self.merger.updateRepo(task.connection_name, task.project_name)
+            self.log.debug("Finished updating repo %s/%s" %
+                           (task.connection_name, task.project_name))
         task.setComplete()
 
     def update(self, connection_name, project_name):
@@ -417,11 +539,35 @@
         task = self.update_queue.put(task)
         return task
 
-    def run(self):
+    def run_merger(self):
+        self.log.debug("Starting merger listener")
+        while self._running:
+            try:
+                job = self.merger_worker.getJob()
+                try:
+                    if job.name == 'merger:cat':
+                        self.log.debug("Got cat job: %s" % job.unique)
+                        self.cat(job)
+                    elif job.name == 'merger:merge':
+                        self.log.debug("Got merge job: %s" % job.unique)
+                        self.merge(job)
+                    else:
+                        self.log.error("Unable to handle job %s" % job.name)
+                        job.sendWorkFail()
+                except Exception:
+                    self.log.exception("Exception while running job")
+                    job.sendWorkException(
+                        traceback.format_exc().encode('utf8'))
+            except gear.InterruptedError:
+                pass
+            except Exception:
+                self.log.exception("Exception while getting job")
+
+    def run_executor(self):
         self.log.debug("Starting executor listener")
         while self._running:
             try:
-                job = self.worker.getJob()
+                job = self.executor_worker.getJob()
                 try:
                     if job.name == 'executor:execute':
                         self.log.debug("Got execute job: %s" % job.unique)
@@ -429,12 +575,6 @@
                     elif job.name.startswith('executor:stop'):
                         self.log.debug("Got stop job: %s" % job.unique)
                         self.stopJob(job)
-                    elif job.name == 'merger:cat':
-                        self.log.debug("Got cat job: %s" % job.unique)
-                        self.cat(job)
-                    elif job.name == 'merger:merge':
-                        self.log.debug("Got merge job: %s" % job.unique)
-                        self.merge(job)
                     else:
                         self.log.error("Unable to handle job %s" % job.name)
                         job.sendWorkFail()
@@ -475,8 +615,9 @@
         args = json.loads(job.arguments)
         task = self.update(args['connection'], args['project'])
         task.wait()
-        files = self.merger.getFiles(args['connection'], args['project'],
-                                     args['branch'], args['files'])
+        with self.merger_lock:
+            files = self.merger.getFiles(args['connection'], args['project'],
+                                         args['branch'], args['files'])
         result = dict(updated=True,
                       files=files,
                       zuul_url=self.zuul_url)
@@ -484,28 +625,35 @@
 
     def merge(self, job):
         args = json.loads(job.arguments)
-        ret = self.merger.mergeChanges(args['items'], args.get('files'))
+        with self.merger_lock:
+            ret = self.merger.mergeChanges(args['items'], args.get('files'),
+                                           args.get('repo_state'))
         result = dict(merged=(ret is not None),
                       zuul_url=self.zuul_url)
-        if args.get('files'):
-            if ret:
-                result['commit'], result['files'] = ret
-            else:
-                result['commit'], result['files'] = (None, None)
+        if ret is None:
+            result['commit'] = result['files'] = result['repo_state'] = None
         else:
-            result['commit'] = ret
+            (result['commit'], result['files'], result['repo_state'],
+             recent) = ret
         job.sendWorkComplete(json.dumps(result))
 
 
-class AnsibleJob(object):
-    log = logging.getLogger("zuul.AnsibleJob")
+class AnsibleJobLogAdapter(logging.LoggerAdapter):
+    def process(self, msg, kwargs):
+        msg, kwargs = super(AnsibleJobLogAdapter, self).process(msg, kwargs)
+        msg = '[build: %s] %s' % (kwargs['extra']['job'], msg)
+        return msg, kwargs
 
+
+class AnsibleJob(object):
     RESULT_NORMAL = 1
     RESULT_TIMED_OUT = 2
     RESULT_UNREACHABLE = 3
     RESULT_ABORTED = 4
 
     def __init__(self, executor_server, job):
+        logger = logging.getLogger("zuul.AnsibleJob")
+        self.log = AnsibleJobLogAdapter(logger, {'job': job.unique})
         self.executor_server = executor_server
         self.job = job
         self.jobdir = None
@@ -513,6 +661,8 @@
         self.proc_lock = threading.Lock()
         self.running = False
         self.aborted = False
+        self.thread = None
+        self.ssh_agent = None
 
         if self.executor_server.config.has_option(
             'executor', 'private_key_file'):
@@ -520,8 +670,11 @@
                 'executor', 'private_key_file')
         else:
             self.private_key_file = '~/.ssh/id_rsa'
+        self.ssh_agent = SshAgent()
 
     def run(self):
+        self.ssh_agent.start()
+        self.ssh_agent.add(self.private_key_file)
         self.running = True
         self.thread = threading.Thread(target=self.execute)
         self.thread.start()
@@ -529,12 +682,14 @@
     def stop(self):
         self.aborted = True
         self.abortRunningProc()
-        self.thread.join()
+        if self.thread:
+            self.thread.join()
 
     def execute(self):
         try:
-            self.jobdir = JobDir(root=self.executor_server.jobdir_root,
-                                 keep=self.executor_server.keep_jobdir)
+            self.jobdir = JobDir(self.executor_server.jobdir_root,
+                                 self.executor_server.keep_jobdir,
+                                 str(self.job.unique))
             self._execute()
         except Exception:
             self.log.exception("Exception while executing job")
@@ -549,6 +704,11 @@
                 self.executor_server.finishJob(self.job.unique)
             except Exception:
                 self.log.exception("Error finalizing job thread:")
+            if self.ssh_agent:
+                try:
+                    self.ssh_agent.stop()
+                except Exception:
+                    self.log.exception("Error stopping SSH agent:")
 
     def _execute(self):
         self.log.debug("Job %s: beginning" % (self.job.unique,))
@@ -567,39 +727,37 @@
             task.wait()
 
         self.log.debug("Job %s: git updates complete" % (self.job.unique,))
-        repos = []
+        merger = self.executor_server._getMerger(self.jobdir.src_root,
+                                                 self.log)
+        repos = {}
         for project in args['projects']:
             self.log.debug("Cloning %s/%s" % (project['connection'],
                                               project['name'],))
-            source = self.executor_server.connections.getSource(
-                project['connection'])
-            project_object = source.getProject(project['name'])
-            url = source.getGitUrl(project_object)
-            repo = git.Repo.clone_from(
-                os.path.join(self.executor_server.merge_root,
-                             source.canonical_hostname,
-                             project['name']),
-                os.path.join(self.jobdir.src_root,
-                             source.canonical_hostname,
-                             project['name']))
-
-            repo.remotes.origin.config_writer.set('url', url)
-            repos.append(repo)
+            repo = merger.getRepo(project['connection'],
+                                  project['name'])
+            repos[project['canonical_name']] = repo
 
         merge_items = [i for i in args['items'] if i.get('refspec')]
         if merge_items:
-            commit = self.doMergeChanges(merge_items)
-            if not commit:
+            if not self.doMergeChanges(merger, merge_items,
+                                       args['repo_state']):
                 # There was a merge conflict and we have already sent
                 # a work complete result, don't run any jobs
                 return
-        else:
-            commit = args['items'][-1]['newrev']  # noqa
+
+        for project in args['projects']:
+            repo = repos[project['canonical_name']]
+            self.checkoutBranch(repo,
+                                project['name'],
+                                args['branch'],
+                                args['override_branch'],
+                                project['override_branch'],
+                                project['default_branch'])
 
         # Delete the origin remote from each repo we set up since
         # it will not be valid within the jobs.
-        for repo in repos:
-            repo.delete_remote(repo.remotes.origin)
+        for repo in repos.values():
+            repo.deleteRemote('origin')
 
         # is the playbook in a repo that we have already prepared?
         trusted, untrusted = self.preparePlaybookRepos(args)
@@ -637,14 +795,42 @@
         result = dict(result=result)
         self.job.sendWorkComplete(json.dumps(result))
 
-    def doMergeChanges(self, items):
-        # Get a merger in order to update the repos involved in this job.
-        merger = self.executor_server._getMerger(self.jobdir.src_root)
-        commit = merger.mergeChanges(items)  # noqa
-        if not commit:  # merge conflict
+    def doMergeChanges(self, merger, items, repo_state):
+        ret = merger.mergeChanges(items, repo_state=repo_state)
+        if not ret:  # merge conflict
             result = dict(result='MERGER_FAILURE')
             self.job.sendWorkComplete(json.dumps(result))
-        return commit
+            return False
+        recent = ret[3]
+        for key, commit in recent.items():
+            (connection, project, branch) = key
+            repo = merger.getRepo(connection, project)
+            repo.setRef('refs/heads/' + branch, commit)
+        return True
+
+    def checkoutBranch(self, repo, project_name, zuul_branch,
+                       job_branch, project_override_branch,
+                       project_default_branch):
+        branches = repo.getBranches()
+        if project_override_branch in branches:
+            self.log.info("Checking out %s project override branch %s",
+                          project_name, project_override_branch)
+            repo.checkoutLocalBranch(project_override_branch)
+        elif job_branch in branches:
+            self.log.info("Checking out %s job branch %s",
+                          project_name, job_branch)
+            repo.checkoutLocalBranch(job_branch)
+        elif zuul_branch and zuul_branch in branches:
+            self.log.info("Checking out %s zuul branch %s",
+                          project_name, zuul_branch)
+            repo.checkoutLocalBranch(zuul_branch)
+        elif project_default_branch in branches:
+            self.log.info("Checking out %s project default branch %s",
+                          project_name, project_default_branch)
+            repo.checkoutLocalBranch(project_default_branch)
+        else:
+            raise Exception("Project %s does not have the default branch %s" %
+                            (project_name, project_default_branch))
 
     def runPlaybooks(self, args):
         result = None
@@ -801,7 +987,8 @@
         # the stack of changes we are testing, so check out the branch
         # tip into a dedicated space.
 
-        merger = self.executor_server._getMerger(jobdir_playbook.root)
+        merger = self.executor_server._getMerger(jobdir_playbook.root,
+                                                 self.log)
         merger.checkoutBranch(playbook['connection'], project.name,
                               playbook['branch'])
 
@@ -885,7 +1072,8 @@
             # in the dependency chain for the change (in which case,
             # there is no existing untrusted checkout of it).  Check
             # out the branch tip into a dedicated space.
-            merger = self.executor_server._getMerger(trusted_root)
+            merger = self.executor_server._getMerger(trusted_root,
+                                                     self.log)
             merger.checkoutBranch(role['connection'], project.name,
                                   'master')
             orig_repo_path = os.path.join(trusted_root,
@@ -1032,12 +1220,26 @@
 
     def runAnsible(self, cmd, timeout, trusted=False):
         env_copy = os.environ.copy()
+        env_copy.update(self.ssh_agent.env)
         env_copy['LOGNAME'] = 'zuul'
+        pythonpath = env_copy.get('PYTHONPATH')
+        if pythonpath:
+            pythonpath = [pythonpath]
+        else:
+            pythonpath = []
+        pythonpath = [self.executor_server.ansible_dir] + pythonpath
+        env_copy['PYTHONPATH'] = os.path.pathsep.join(pythonpath)
 
         if trusted:
             config_file = self.jobdir.trusted_config
+            popen = subprocess.Popen
         else:
             config_file = self.jobdir.untrusted_config
+            driver = self.executor_server.untrusted_wrapper
+            popen = driver.getPopen(
+                work_dir=self.jobdir.root,
+                ansible_dir=self.executor_server.ansible_dir,
+                ssh_auth_sock=env_copy.get('SSH_AUTH_SOCK'))
 
         env_copy['ANSIBLE_CONFIG'] = config_file
 
@@ -1046,7 +1248,7 @@
                 return (self.RESULT_ABORTED, None)
             self.log.debug("Ansible command: ANSIBLE_CONFIG=%s %s",
                            config_file, " ".join(shlex_quote(c) for c in cmd))
-            self.proc = subprocess.Popen(
+            self.proc = popen(
                 cmd,
                 cwd=self.jobdir.work_root,
                 stdout=subprocess.PIPE,
diff --git a/zuul/lib/connections.py b/zuul/lib/connections.py
index 9908fff..79d78f4 100644
--- a/zuul/lib/connections.py
+++ b/zuul/lib/connections.py
@@ -22,6 +22,8 @@
 import zuul.driver.smtp
 import zuul.driver.timer
 import zuul.driver.sql
+import zuul.driver.bubblewrap
+import zuul.driver.nullwrap
 from zuul.connection import BaseConnection
 from zuul.driver import SourceInterface
 
@@ -46,6 +48,8 @@
         self.registerDriver(zuul.driver.smtp.SMTPDriver())
         self.registerDriver(zuul.driver.timer.TimerDriver())
         self.registerDriver(zuul.driver.sql.SQLDriver())
+        self.registerDriver(zuul.driver.bubblewrap.BubblewrapDriver())
+        self.registerDriver(zuul.driver.nullwrap.NullwrapDriver())
 
     def registerDriver(self, driver):
         if driver.name in self.drivers:
diff --git a/zuul/lib/log_streamer.py b/zuul/lib/log_streamer.py
new file mode 100644
index 0000000..de072b6
--- /dev/null
+++ b/zuul/lib/log_streamer.py
@@ -0,0 +1,236 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2016 IBM Corp.
+# Copyright 2017 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import os
+import os.path
+import pwd
+import re
+import select
+import socket
+import threading
+import time
+
+try:
+    import SocketServer as ss  # python 2.x
+except ImportError:
+    import socketserver as ss  # python 3
+
+
+class Log(object):
+
+    def __init__(self, path):
+        self.path = path
+        self.file = open(path)
+        self.stat = os.stat(path)
+        self.size = self.stat.st_size
+
+
+class RequestHandler(ss.BaseRequestHandler):
+    '''
+    Class to handle a single log streaming request.
+
+    The log streaming code was blatantly stolen from zuul_console.py. Only
+    the (class/method/attribute) names were changed to protect the innocent.
+    '''
+
+    MAX_REQUEST_LEN = 1024
+    REQUEST_TIMEOUT = 10
+
+    def get_command(self):
+        poll = select.poll()
+        bitmask = (select.POLLIN | select.POLLERR |
+                   select.POLLHUP | select.POLLNVAL)
+        poll.register(self.request, bitmask)
+        buffer = b''
+        ret = None
+        start = time.time()
+        while True:
+            elapsed = time.time() - start
+            timeout = max(self.REQUEST_TIMEOUT - elapsed, 0)
+            if not timeout:
+                raise Exception("Timeout while waiting for input")
+            for fd, event in poll.poll(timeout):
+                if event & select.POLLIN:
+                    buffer += self.request.recv(self.MAX_REQUEST_LEN)
+                else:
+                    raise Exception("Received error event")
+            if len(buffer) >= self.MAX_REQUEST_LEN:
+                raise Exception("Request too long")
+            try:
+                ret = buffer.decode('utf-8')
+                x = ret.find('\n')
+                if x > 0:
+                    return ret[:x]
+            except UnicodeDecodeError:
+                pass
+
+    def handle(self):
+        build_uuid = self.get_command()
+        build_uuid = build_uuid.rstrip()
+
+        # validate build ID
+        if not re.match("[0-9A-Fa-f]+$", build_uuid):
+            msg = 'Build ID %s is not valid' % build_uuid
+            self.request.sendall(msg.encode("utf-8"))
+            return
+
+        job_dir = os.path.join(self.server.jobdir_root, build_uuid)
+        if not os.path.exists(job_dir):
+            msg = 'Build ID %s not found' % build_uuid
+            self.request.sendall(msg.encode("utf-8"))
+            return
+
+        # check if log file exists
+        log_file = os.path.join(job_dir, 'ansible', 'ansible_log.txt')
+        if not os.path.exists(log_file):
+            msg = 'Log not found for build ID %s' % build_uuid
+            self.request.sendall(msg.encode("utf-8"))
+            return
+
+        self.stream_log(log_file)
+
+    def stream_log(self, log_file):
+        log = None
+        while True:
+            if log is not None:
+                try:
+                    log.file.close()
+                except:
+                    pass
+            while True:
+                log = self.chunk_log(log_file)
+                if log:
+                    break
+                time.sleep(0.5)
+            while True:
+                if self.follow_log(log):
+                    break
+                else:
+                    return
+
+    def chunk_log(self, log_file):
+        try:
+            log = Log(log_file)
+        except Exception:
+            return
+        while True:
+            chunk = log.file.read(4096)
+            if not chunk:
+                break
+            self.request.send(chunk.encode('utf-8'))
+        return log
+
+    def follow_log(self, log):
+        while True:
+            # As long as we have unread data, keep reading/sending
+            while True:
+                chunk = log.file.read(4096)
+                if chunk:
+                    self.request.send(chunk.encode('utf-8'))
+                else:
+                    break
+
+            # At this point, we are waiting for more data to be written
+            time.sleep(0.5)
+
+            # Check to see if the remote end has sent any data, if so,
+            # discard
+            r, w, e = select.select([self.request], [], [self.request], 0)
+            if self.request in e:
+                return False
+            if self.request in r:
+                ret = self.request.recv(1024)
+                # Discard anything read, if input is eof, it has
+                # disconnected.
+                if not ret:
+                    return False
+
+            # See if the file has been truncated
+            try:
+                st = os.stat(log.path)
+                if (st.st_ino != log.stat.st_ino or
+                    st.st_size < log.size):
+                    return True
+            except Exception:
+                return True
+            log.size = st.st_size
+
+
+class CustomForkingTCPServer(ss.ForkingTCPServer):
+    '''
+    Custom version that allows us to drop privileges after port binding.
+    '''
+    def __init__(self, *args, **kwargs):
+        self.user = kwargs.pop('user')
+        self.jobdir_root = kwargs.pop('jobdir_root')
+        # For some reason, setting custom attributes does not work if we
+        # call the base class __init__ first. Wha??
+        ss.ForkingTCPServer.__init__(self, *args, **kwargs)
+
+    def change_privs(self):
+        '''
+        Drop our privileges to the zuul user.
+        '''
+        if os.getuid() != 0:
+            return
+        pw = pwd.getpwnam(self.user)
+        os.setgroups([])
+        os.setgid(pw.pw_gid)
+        os.setuid(pw.pw_uid)
+        os.umask(0o022)
+
+    def server_bind(self):
+        self.allow_reuse_address = True
+        ss.ForkingTCPServer.server_bind(self)
+        if self.user:
+            self.change_privs()
+
+    def server_close(self):
+        '''
+        Overridden from base class to shutdown the socket immediately.
+        '''
+        try:
+            self.socket.shutdown(socket.SHUT_RD)
+            self.socket.close()
+        except socket.error as e:
+            # If it's already closed, don't error.
+            if e.errno == socket.EBADF:
+                return
+            raise
+
+
+class LogStreamer(object):
+    '''
+    Class implementing log streaming over the finger daemon port.
+    '''
+
+    def __init__(self, user, host, port, jobdir_root):
+        self.server = CustomForkingTCPServer((host, port),
+                                             RequestHandler,
+                                             user=user,
+                                             jobdir_root=jobdir_root)
+
+        # We start the actual serving within a thread so we can return to
+        # the owner.
+        self.thd = threading.Thread(target=self.server.serve_forever)
+        self.thd.daemon = True
+        self.thd.start()
+
+    def stop(self):
+        if self.thd.isAlive():
+            self.server.shutdown()
+            self.server.server_close()
diff --git a/zuul/manager/__init__.py b/zuul/manager/__init__.py
index d13a1b4..4005b01 100644
--- a/zuul/manager/__init__.py
+++ b/zuul/manager/__init__.py
@@ -146,20 +146,17 @@
 
     def reportStart(self, item):
         if not self.pipeline._disabled:
-            source = item.change.project.source
             try:
                 self.log.info("Reporting start, action %s item %s" %
                               (self.pipeline.start_actions, item))
-                ret = self.sendReport(self.pipeline.start_actions,
-                                      source, item)
+                ret = self.sendReport(self.pipeline.start_actions, item)
                 if ret:
                     self.log.error("Reporting item start %s received: %s" %
                                    (item, ret))
             except:
                 self.log.exception("Exception while reporting start:")
 
-    def sendReport(self, action_reporters, source, item,
-                   message=None):
+    def sendReport(self, action_reporters, item, message=None):
         """Sends the built message off to configured reporters.
 
         Takes the action_reporters, item, message and extra options and
@@ -168,7 +165,7 @@
         report_errors = []
         if len(action_reporters) > 0:
             for reporter in action_reporters:
-                ret = reporter.report(source, self.pipeline, item)
+                ret = reporter.report(self.pipeline, item)
                 if ret:
                     report_errors.append(ret)
             if len(report_errors) == 0:
@@ -192,17 +189,6 @@
     def getFailingDependentItems(self, item):
         return None
 
-    def getDependentItems(self, item):
-        orig_item = item
-        items = []
-        while item.item_ahead:
-            items.append(item.item_ahead)
-            item = item.item_ahead
-        self.log.info("Change %s depends on changes %s" %
-                      (orig_item.change,
-                       [x.change for x in items]))
-        return items
-
     def getItemForChange(self, change):
         for item in self.pipeline.getAllItems():
             if item.change.equals(change):
@@ -296,6 +282,10 @@
 
         if not ignore_requirements:
             for f in self.changeish_filters:
+                if f.connection_name != change.project.connection_name:
+                    self.log.debug("Filter %s skipped for change %s due "
+                                   "to mismatched connections" % (f, change))
+                    continue
                 if not f.matches(change):
                     self.log.debug("Change %s does not match pipeline "
                                    "requirement %s" % (change, f))
@@ -326,9 +316,7 @@
                 item.enqueue_time = enqueue_time
             item.live = live
             self.reportStats(item)
-            if not quiet:
-                if len(self.pipeline.start_actions) > 0:
-                    self.reportStart(item)
+            item.quiet = quiet
             self.enqueueChangesBehind(change, quiet, ignore_requirements,
                                       change_queue)
             zuul_driver = self.sched.connections.drivers['zuul']
@@ -364,7 +352,7 @@
 
     def _executeJobs(self, item, jobs):
         self.log.debug("Executing jobs for change %s" % item.change)
-        dependent_items = self.getDependentItems(item)
+        build_set = item.current_build_set
         for job in jobs:
             self.log.debug("Found job %s for change %s" % (job, item.change))
             try:
@@ -372,7 +360,8 @@
                 self.sched.nodepool.useNodeSet(nodeset)
                 build = self.sched.executor.execute(job, item,
                                                     self.pipeline,
-                                                    dependent_items)
+                                                    build_set.dependent_items,
+                                                    build_set.merger_items)
                 self.log.debug("Adding build %s of job %s to item %s" %
                                (build, job, item))
                 item.addBuild(build)
@@ -502,16 +491,11 @@
 
         self.log.debug("Scheduling merge for item %s (files: %s)" %
                        (item, files))
-        dependent_items = self.getDependentItems(item)
-        dependent_items.reverse()
-        all_items = dependent_items + [item]
-        merger_items = [i.makeMergerItem() for i in all_items]
         build_set = item.current_build_set
         build_set.merge_state = build_set.PENDING
-        self.sched.merger.mergeChanges(merger_items,
-                                       item.current_build_set,
-                                       files,
-                                       self.pipeline.precedence)
+        self.sched.merger.mergeChanges(build_set.merger_items,
+                                       item.current_build_set, files,
+                                       precedence=self.pipeline.precedence)
         return False
 
     def prepareItem(self, item):
@@ -598,6 +582,14 @@
                 self.cancelJobs(item)
             if actionable:
                 ready = self.prepareItem(item) and self.prepareJobs(item)
+                # Starting jobs reporting should only be done once if there are
+                # jobs to run for this item.
+                if ready and len(self.pipeline.start_actions) > 0 \
+                        and len(item.job_graph.jobs) > 0 \
+                        and not item.reported_start \
+                        and not item.quiet:
+                    self.reportStart(item)
+                    item.reported_start = True
                 if item.current_build_set.unable_to_merge:
                     failing_reasons.append("it has a merge conflict")
                 if item.current_build_set.config_error:
@@ -684,6 +676,7 @@
         if event.merged:
             build_set.commit = event.commit
             build_set.files.setFiles(event.files)
+            build_set.repo_state = event.repo_state
         elif event.updated:
             build_set.commit = item.change.newrev
         if not build_set.commit:
@@ -737,9 +730,21 @@
 
     def _reportItem(self, item):
         self.log.debug("Reporting change %s" % item.change)
-        source = item.change.project.source
         ret = True  # Means error as returned by trigger.report
-        if item.getConfigError():
+
+        # In the case of failure, we may not hove completed an initial
+        # merge which would get the layout for this item, so in order
+        # to determine whether this item's project is in this
+        # pipeline, use the dynamic layout if available, otherwise,
+        # fall back to the current static layout as a best
+        # approximation.
+        layout = item.layout or self.pipeline.layout
+
+        if not layout.hasProject(item.change.project):
+            self.log.debug("Project %s not in pipeline %s for change %s" % (
+                item.change.project, self.pipeline, item.change))
+            actions = []
+        elif item.getConfigError():
             self.log.debug("Invalid config for change %s" % item.change)
             # TODOv3(jeblair): consider a new reporter action for this
             actions = self.pipeline.merge_failure_actions
@@ -747,9 +752,12 @@
         elif item.didMergerFail():
             actions = self.pipeline.merge_failure_actions
             item.setReportedResult('MERGER_FAILURE')
+        elif item.wasDequeuedNeedingChange():
+            actions = self.pipeline.failure_actions
+            item.setReportedResult('FAILURE')
         elif not item.getJobs():
             # We don't send empty reports with +1
-            self.log.debug("No jobs for change %s" % item.change)
+            self.log.debug("No jobs for change %s" % (item.change,))
             actions = []
         elif item.didAllJobsSucceed():
             self.log.debug("success %s" % (self.pipeline.success_actions))
@@ -760,7 +768,7 @@
             actions = self.pipeline.failure_actions
             item.setReportedResult('FAILURE')
             self.pipeline._consecutive_failures += 1
-        if self.pipeline._disabled:
+        if layout.hasProject(item.change.project) and self.pipeline._disabled:
             actions = self.pipeline.disabled_actions
         # Check here if we should disable so that we only use the disabled
         # reporters /after/ the last disable_at failure is still reported as
@@ -772,7 +780,7 @@
             try:
                 self.log.info("Reporting item %s, actions: %s" %
                               (item, actions))
-                ret = self.sendReport(actions, source, item)
+                ret = self.sendReport(actions, item)
                 if ret:
                     self.log.error("Reporting item %s received: %s" %
                                    (item, ret))
diff --git a/zuul/merger/client.py b/zuul/merger/client.py
index e164195..c98f20e 100644
--- a/zuul/merger/client.py
+++ b/zuul/merger/client.py
@@ -107,10 +107,11 @@
                                timeout=300)
         return job
 
-    def mergeChanges(self, items, build_set, files=None,
+    def mergeChanges(self, items, build_set, files=None, repo_state=None,
                      precedence=zuul.model.PRECEDENCE_NORMAL):
         data = dict(items=items,
-                    files=files)
+                    files=files,
+                    repo_state=repo_state)
         self.submitJob('merger:merge', data, build_set, precedence)
 
     def getFiles(self, connection_name, project_name, branch, files,
@@ -129,6 +130,7 @@
         updated = data.get('updated', False)
         commit = data.get('commit')
         files = data.get('files', {})
+        repo_state = data.get('repo_state', {})
         job.files = files
         self.log.info("Merge %s complete, merged: %s, updated: %s, "
                       "commit: %s" %
@@ -136,7 +138,8 @@
         job.setComplete()
         if job.build_set:
             self.sched.onMergeCompleted(job.build_set, zuul_url,
-                                        merged, updated, commit, files)
+                                        merged, updated, commit, files,
+                                        repo_state)
         # The test suite expects the job to be removed from the
         # internal account after the wake flag is set.
         self.jobs.remove(job)
diff --git a/zuul/merger/merger.py b/zuul/merger/merger.py
index 714d643..6cfd904 100644
--- a/zuul/merger/merger.py
+++ b/zuul/merger/merger.py
@@ -14,6 +14,7 @@
 # under the License.
 
 import git
+import gitdb
 import os
 import logging
 
@@ -41,13 +42,17 @@
 
 
 class Repo(object):
-    log = logging.getLogger("zuul.Repo")
-
-    def __init__(self, remote, local, email, username):
+    def __init__(self, remote, local, email, username,
+                 cache_path=None, logger=None):
+        if logger is None:
+            self.log = logging.getLogger("zuul.Repo")
+        else:
+            self.log = logger
         self.remote_url = remote
         self.local_path = local
         self.email = email
         self.username = username
+        self.cache_path = cache_path
         self._initialized = False
         try:
             self._ensure_cloned()
@@ -59,17 +64,32 @@
         if self._initialized and repo_is_cloned:
             return
         # If the repo does not exist, clone the repo.
+        rewrite_url = False
         if not repo_is_cloned:
             self.log.debug("Cloning from %s to %s" % (self.remote_url,
                                                       self.local_path))
-            git.Repo.clone_from(self.remote_url, self.local_path)
+            if self.cache_path:
+                git.Repo.clone_from(self.cache_path, self.local_path)
+                rewrite_url = True
+            else:
+                git.Repo.clone_from(self.remote_url, self.local_path)
         repo = git.Repo(self.local_path)
+        # Create local branches corresponding to all the remote branches
+        if not repo_is_cloned:
+            origin = repo.remotes.origin
+            for ref in origin.refs:
+                if ref.remote_head == 'HEAD':
+                    continue
+                repo.create_head(ref.remote_head, ref, force=True)
         with repo.config_writer() as config_writer:
             if self.email:
                 config_writer.set_value('user', 'email', self.email)
             if self.username:
                 config_writer.set_value('user', 'name', self.username)
             config_writer.write()
+        if rewrite_url:
+            with repo.remotes.origin.config_writer as config_writer:
+                config_writer.set('url', self.remote_url)
         self._initialized = True
 
     def isInitialized(self):
@@ -117,6 +137,10 @@
         origin = repo.remotes.origin
         return branch in origin.refs
 
+    def getBranches(self):
+        repo = self.createRepoObject()
+        return [x.name for x in repo.heads]
+
     def getCommitFromRef(self, refname):
         repo = self.createRepoObject()
         if refname not in repo.refs:
@@ -124,6 +148,31 @@
         ref = repo.refs[refname]
         return ref.commit
 
+    def getRefs(self):
+        repo = self.createRepoObject()
+        return repo.refs
+
+    def setRef(self, path, hexsha, repo=None):
+        if repo is None:
+            repo = self.createRepoObject()
+        binsha = gitdb.util.to_bin_sha(hexsha)
+        obj = git.objects.Object.new_from_sha(repo, binsha)
+        self.log.debug("Create reference %s", path)
+        git.refs.Reference.create(repo, path, obj, force=True)
+
+    def setRefs(self, refs):
+        repo = self.createRepoObject()
+        current_refs = {}
+        for ref in repo.refs:
+            current_refs[ref.path] = ref
+        unseen = set(current_refs.keys())
+        for path, hexsha in refs.items():
+            self.setRef(path, hexsha, repo)
+            unseen.discard(path)
+        for path in unseen:
+            self.log.debug("Delete reference %s", path)
+            git.refs.SymbolicReference.delete(repo, ref.path)
+
     def checkout(self, ref):
         repo = self.createRepoObject()
         self.log.debug("Checking out %s" % ref)
@@ -131,6 +180,13 @@
         reset_repo_to_head(repo)
         return repo.head.commit
 
+    def checkoutLocalBranch(self, branch):
+        repo = self.createRepoObject()
+        # Perform a hard reset before checking out so that we clean up
+        # anything that might be left over from a merge.
+        reset_repo_to_head(repo)
+        repo.heads[branch].checkout()
+
     def cherryPick(self, ref):
         repo = self.createRepoObject()
         self.log.debug("Cherry-picking %s" % ref)
@@ -204,11 +260,19 @@
                 ret[fn] = None
         return ret
 
+    def deleteRemote(self, remote):
+        repo = self.createRepoObject()
+        repo.delete_remote(repo.remotes[remote])
+
 
 class Merger(object):
-    log = logging.getLogger("zuul.Merger")
-
-    def __init__(self, working_root, connections, email, username):
+    def __init__(self, working_root, connections, email, username,
+                 cache_root=None, logger=None):
+        self.logger = logger
+        if logger is None:
+            self.log = logging.getLogger("zuul.Merger")
+        else:
+            self.log = logger
         self.repos = {}
         self.working_root = working_root
         if not os.path.exists(working_root):
@@ -216,6 +280,7 @@
         self.connections = connections
         self.email = email
         self.username = username
+        self.cache_root = cache_root
 
     def _get_ssh_cmd(self, connection_name):
         sshkey = self.connections.connections.get(connection_name).\
@@ -238,7 +303,13 @@
         key = '/'.join([hostname, project_name])
         try:
             path = os.path.join(self.working_root, hostname, project_name)
-            repo = Repo(url, path, self.email, self.username)
+            if self.cache_root:
+                cache_path = os.path.join(self.cache_root, hostname,
+                                          project_name)
+            else:
+                cache_path = None
+            repo = Repo(url, path, self.email, self.username, cache_path,
+                        self.logger)
 
             self.repos[key] = repo
         except Exception:
@@ -275,15 +346,37 @@
                                connection_name, project_name)
 
     def checkoutBranch(self, connection_name, project_name, branch):
+        self.log.info("Checking out %s/%s branch %s",
+                      connection_name, project_name, branch)
         repo = self.getRepo(connection_name, project_name)
-        if repo.hasBranch(branch):
-            self.log.info("Checking out branch %s of %s/%s" %
-                          (branch, connection_name, project_name))
-            head = repo.getBranchHead(branch)
-            repo.checkout(head)
-        else:
-            raise Exception("Project %s/%s does not have branch %s" %
-                            (connection_name, project_name, branch))
+        repo.checkoutLocalBranch(branch)
+
+    def _saveRepoState(self, connection_name, project_name, repo,
+                       repo_state, recent):
+        projects = repo_state.setdefault(connection_name, {})
+        project = projects.setdefault(project_name, {})
+        for ref in repo.getRefs():
+            if ref.path.startswith('refs/zuul/'):
+                continue
+            if ref.path.startswith('refs/remotes/'):
+                continue
+            if ref.path.startswith('refs/heads/'):
+                branch = ref.path[len('refs/heads/'):]
+                key = (connection_name, project_name, branch)
+                if key not in recent:
+                    recent[key] = ref.object
+            project[ref.path] = ref.object.hexsha
+
+    def _restoreRepoState(self, connection_name, project_name, repo,
+                          repo_state):
+        projects = repo_state.get(connection_name, {})
+        project = projects.get(project_name, {})
+        if not project:
+            # We don't have a state for this project.
+            return
+        self.log.debug("Restore repo state for project %s/%s",
+                       connection_name, project_name)
+        repo.setRefs(project)
 
     def _mergeChange(self, item, ref):
         repo = self.getRepo(item['connection'], item['project'])
@@ -314,27 +407,13 @@
 
         return commit
 
-    def _mergeItem(self, item, recent):
+    def _mergeItem(self, item, recent, repo_state):
         self.log.debug("Processing refspec %s for project %s/%s / %s ref %s" %
                        (item['refspec'], item['connection'],
                         item['project'], item['branch'], item['ref']))
         repo = self.getRepo(item['connection'], item['project'])
         key = (item['connection'], item['project'], item['branch'])
 
-        # See if we have a commit for this change already in this repo
-        zuul_ref = item['branch'] + '/' + item['ref']
-        with repo.createRepoObject().git.custom_environment(
-            GIT_SSH_COMMAND=self._get_ssh_cmd(item['connection'])):
-            commit = repo.getCommitFromRef(zuul_ref)
-            if commit:
-                self.log.debug(
-                    "Found commit %s for ref %s" % (commit, zuul_ref))
-                # Store this as the most recent commit for this
-                # project-branch
-                recent[key] = commit
-                return commit
-
-        self.log.debug("Unable to find commit for ref %s" % (zuul_ref,))
         # We need to merge the change
         # Get the most recent commit for this project-branch
         base = recent.get(key)
@@ -347,7 +426,14 @@
             except Exception:
                 self.log.exception("Unable to reset repo %s" % repo)
                 return None
+            self._restoreRepoState(item['connection'], item['project'], repo,
+                                   repo_state)
+
             base = repo.getBranchHead(item['branch'])
+            # Save the repo state so that later mergers can repeat
+            # this process.
+            self._saveRepoState(item['connection'], item['project'], repo,
+                                repo_state, recent)
         else:
             self.log.debug("Found base commit %s for %s" % (base, key,))
         # Merge the change
@@ -362,20 +448,26 @@
             # commits of each project-branch
             for key, mrc in recent.items():
                 connection, project, branch = key
+                zuul_ref = None
                 try:
                     repo = self.getRepo(connection, project)
                     zuul_ref = branch + '/' + item['ref']
-                    repo.createZuulRef(zuul_ref, mrc)
+                    if not repo.getCommitFromRef(zuul_ref):
+                        repo.createZuulRef(zuul_ref, mrc)
                 except Exception:
                     self.log.exception("Unable to set zuul ref %s for "
                                        "item %s" % (zuul_ref, item))
                     return None
             return commit
 
-    def mergeChanges(self, items, files=None):
+    def mergeChanges(self, items, files=None, repo_state=None):
+        # connection+project+branch -> commit
         recent = {}
         commit = None
         read_files = []
+        # connection -> project -> ref -> commit
+        if repo_state is None:
+            repo_state = {}
         for item in items:
             if item.get("number") and item.get("patchset"):
                 self.log.debug("Merging for change %s,%s." %
@@ -383,7 +475,7 @@
             elif item.get("newrev") and item.get("oldrev"):
                 self.log.debug("Merging for rev %s with oldrev %s." %
                                (item["newrev"], item["oldrev"]))
-            commit = self._mergeItem(item, recent)
+            commit = self._mergeItem(item, recent, repo_state)
             if not commit:
                 return None
             if files:
@@ -394,9 +486,10 @@
                     project=item['project'],
                     branch=item['branch'],
                     files=repo_files))
-        if files:
-            return commit.hexsha, read_files
-        return commit.hexsha
+        ret_recent = {}
+        for k, v in recent.items():
+            ret_recent[k] = v.hexsha
+        return commit.hexsha, read_files, repo_state, ret_recent
 
     def getFiles(self, connection_name, project_name, branch, files):
         repo = self.getRepo(connection_name, project_name)
diff --git a/zuul/merger/server.py b/zuul/merger/server.py
index c09d7ba..1a32f96 100644
--- a/zuul/merger/server.py
+++ b/zuul/merger/server.py
@@ -103,16 +103,15 @@
 
     def merge(self, job):
         args = json.loads(job.arguments)
-        ret = self.merger.mergeChanges(args['items'], args.get('files'))
+        ret = self.merger.mergeChanges(args['items'], args.get('files'),
+                                       args.get('repo_state'))
         result = dict(merged=(ret is not None),
                       zuul_url=self.zuul_url)
-        if args.get('files'):
-            if ret:
-                result['commit'], result['files'] = ret
-            else:
-                result['commit'], result['files'] = (None, None)
+        if ret is None:
+            result['commit'] = result['files'] = result['repo_state'] = None
         else:
-            result['commit'] = ret
+            (result['commit'], result['files'], result['repo_state'],
+             recent) = ret
         job.sendWorkComplete(json.dumps(result))
 
     def cat(self, job):
diff --git a/zuul/model.py b/zuul/model.py
index 4ae6f9a..b6c6366 100644
--- a/zuul/model.py
+++ b/zuul/model.py
@@ -752,8 +752,9 @@
             attempts=3,
             final=False,
             roles=frozenset(),
-            repos=frozenset(),
+            required_projects={},
             allowed_projects=None,
+            override_branch=None,
         )
 
         # These are generally internal attributes which are not
@@ -820,6 +821,11 @@
         Job._deepUpdate(v, other_vars)
         self.variables = v
 
+    def updateProjects(self, other_projects):
+        required_projects = self.required_projects
+        Job._deepUpdate(required_projects, other_projects)
+        self.required_projects = required_projects
+
     @staticmethod
     def _deepUpdate(a, b):
         # Merge nested dictionaries if possible, otherwise, overwrite
@@ -871,7 +877,8 @@
                                     "%s=%s with variant %s" % (
                                         repr(self), k, other._get(k),
                                         repr(other)))
-                if k not in set(['pre_run', 'post_run', 'roles', 'variables']):
+                if k not in set(['pre_run', 'post_run', 'roles', 'variables',
+                                 'required_projects']):
                     setattr(self, k, copy.deepcopy(other._get(k)))
 
         # Don't set final above so that we don't trip an error halfway
@@ -887,6 +894,8 @@
             self.roles = self.roles.union(other.roles)
         if other._get('variables') is not None:
             self.updateVariables(other.variables)
+        if other._get('required_projects') is not None:
+            self.updateProjects(other.required_projects)
 
         for k in self.context_attributes:
             if (other._get(k) is not None and
@@ -914,6 +923,14 @@
         return True
 
 
+class JobProject(object):
+    """ A reference to a project from a job. """
+
+    def __init__(self, project_name, override_branch=None):
+        self.project_name = project_name
+        self.override_branch = override_branch
+
+
 class JobList(object):
     """ A list of jobs in a project's pipeline. """
 
@@ -929,7 +946,7 @@
     def inheritFrom(self, other):
         for jobname, jobs in other.jobs.items():
             if jobname in self.jobs:
-                self.jobs[jobname].append(jobs)
+                self.jobs[jobname].extend(jobs)
             else:
                 self.jobs[jobname] = jobs
 
@@ -1131,7 +1148,6 @@
 
     def __init__(self, item):
         self.item = item
-        self.other_changes = []
         self.builds = {}
         self.result = None
         self.next_build_set = None
@@ -1139,6 +1155,8 @@
         self.ref = None
         self.commit = None
         self.zuul_url = None
+        self.dependent_items = None
+        self.merger_items = None
         self.unable_to_merge = False
         self.config_error = None  # None or an error message string.
         self.failing_reasons = []
@@ -1146,6 +1164,7 @@
         self.nodesets = {}  # job -> nodeset
         self.node_requests = {}  # job -> reqs
         self.files = RepoFiles()
+        self.repo_state = {}
         self.layout = None
         self.tries = {}
 
@@ -1159,13 +1178,19 @@
         # The change isn't enqueued until after it's created
         # so we don't know what the other changes ahead will be
         # until jobs start.
-        if not self.other_changes:
+        if self.dependent_items is None:
+            items = []
             next_item = self.item.item_ahead
             while next_item:
-                self.other_changes.append(next_item.change)
+                items.append(next_item)
                 next_item = next_item.item_ahead
+            self.dependent_items = items
         if not self.ref:
             self.ref = 'Z' + uuid4().hex
+        if self.merger_items is None:
+            items = [self.item] + self.dependent_items
+            items.reverse()
+            self.merger_items = [i.makeMergerItem() for i in items]
 
     def getStateName(self, state_num):
         return self.states_map.get(
@@ -1217,9 +1242,26 @@
         return self.tries.get(job_name, 0)
 
     def getMergeMode(self):
-        if self.layout:
+        # We may be called before this build set has a shadow layout
+        # (ie, we are called to perform the merge to create that
+        # layout).  It's possible that the change we are merging will
+        # update the merge-mode for the project, but there's not much
+        # we can do about that here.  Instead, do the best we can by
+        # using the nearest shadow layout to determine the merge mode,
+        # or if that fails, the current live layout, or if that fails,
+        # use the default: merge-resolve.
+        item = self.item
+        layout = None
+        while item:
+            layout = item.current_build_set.layout
+            if layout:
+                break
+            item = item.item_ahead
+        if not layout:
+            layout = self.item.pipeline.layout
+        if layout:
             project = self.item.change.project
-            project_config = self.layout.project_configs.get(
+            project_config = layout.project_configs.get(
                 project.canonical_name)
             if project_config:
                 return project_config.merge_mode
@@ -1248,6 +1290,8 @@
         self.enqueue_time = None
         self.dequeue_time = None
         self.reported = False
+        self.reported_start = False
+        self.quiet = False
         self.active = False  # Whether an item is within an active window
         self.live = True  # Whether an item is intended to be processed at all
         self.layout = None  # This item's shadow layout
@@ -1355,6 +1399,9 @@
     def getConfigError(self):
         return self.current_build_set.config_error
 
+    def wasDequeuedNeedingChange(self):
+        return self.dequeued_needing_change
+
     def isHoldingFollowingChanges(self):
         if not self.live:
             return False
@@ -1499,8 +1546,8 @@
         # secrets, etc.
         safe_change = self.change.getSafeAttributes()
         safe_pipeline = self.pipeline.getSafeAttributes()
-        safe_job = job.getSafeAttributes()
-        safe_build = build.getSafeAttributes()
+        safe_job = job.getSafeAttributes() if job else {}
+        safe_build = build.getSafeAttributes() if build else {}
         try:
             url = url_pattern.format(change=safe_change,
                                      pipeline=safe_pipeline,
@@ -1899,8 +1946,9 @@
 
 class RefFilter(BaseFilter):
     """Allows a Manager to only enqueue Changes that meet certain criteria."""
-    def __init__(self):
+    def __init__(self, connection_name):
         super(RefFilter, self).__init__()
+        self.connection_name = connection_name
 
     def matches(self, change):
         return True
@@ -1919,6 +1967,7 @@
     def __init__(self, name):
         self.name = name
         self.merge_mode = None
+        self.default_branch = None
         self.pipelines = {}
         self.private_key_file = None
 
@@ -2160,6 +2209,9 @@
             self._createJobGraph(item, project_job_list, ret)
         return ret
 
+    def hasProject(self, project):
+        return project.canonical_name in self.project_configs
+
 
 class Semaphore(object):
     def __init__(self, name, max=1):
diff --git a/zuul/reporter/__init__.py b/zuul/reporter/__init__.py
index 582265d..9c8e953 100644
--- a/zuul/reporter/__init__.py
+++ b/zuul/reporter/__init__.py
@@ -37,7 +37,7 @@
         self._action = action
 
     @abc.abstractmethod
-    def report(self, source, pipeline, item):
+    def report(self, pipeline, item):
         """Send the compiled report message."""
 
     def getSubmitAllowNeeds(self):
diff --git a/zuul/scheduler.py b/zuul/scheduler.py
index 2c24125..61f1e5f 100644
--- a/zuul/scheduler.py
+++ b/zuul/scheduler.py
@@ -138,16 +138,18 @@
     :arg bool merged: Whether the merge succeeded (changes with refs).
     :arg bool updated: Whether the repo was updated (changes without refs).
     :arg str commit: The SHA of the merged commit (changes with refs).
+    :arg dict repo_state: The starting repo state before the merge.
     """
 
     def __init__(self, build_set, zuul_url, merged, updated, commit,
-                 files):
+                 files, repo_state):
         self.build_set = build_set
         self.zuul_url = zuul_url
         self.merged = merged
         self.updated = updated
         self.commit = commit
         self.files = files
+        self.repo_state = repo_state
 
 
 class NodesProvisionedEvent(ResultEvent):
@@ -311,11 +313,11 @@
         self.log.debug("Done adding complete event for build: %s" % build)
 
     def onMergeCompleted(self, build_set, zuul_url, merged, updated,
-                         commit, files):
+                         commit, files, repo_state):
         self.log.debug("Adding merge complete event for build set: %s" %
                        build_set)
         event = MergeCompletedEvent(build_set, zuul_url, merged,
-                                    updated, commit, files)
+                                    updated, commit, files, repo_state)
         self.result_event_queue.put(event)
         self.wake_event.set()