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/unit/test_v3.py b/tests/unit/test_v3.py
index 2168a7f..21b4729 100644
--- a/tests/unit/test_v3.py
+++ b/tests/unit/test_v3.py
@@ -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/driver/bubblewrap/__init__.py b/zuul/driver/bubblewrap/__init__.py
index 6426fbb..c93e912 100644
--- a/zuul/driver/bubblewrap/__init__.py
+++ b/zuul/driver/bubblewrap/__init__.py
@@ -22,6 +22,8 @@
 import subprocess
 import sys
 
+from six.moves import shlex_quote
+
 from zuul.driver import (Driver, WrapperInterface)
 
 
@@ -141,6 +143,9 @@
         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