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:title: Gerrit Driver
Gerrit
======
`Gerrit`_ is a code review system. The Gerrit driver supports
sources, triggers, and reporters.
.. _Gerrit: https://www.gerritcodereview.com/
Zuul will need access to a Gerrit user.
Create an SSH keypair for Zuul to use if there isn't one already, and
create a Gerrit user with that key::
cat ~/id_rsa.pub | ssh -p29418 review.example.com gerrit create-account --ssh-key - --full-name Zuul zuul
Give that user whatever permissions will be needed on the projects you
want Zuul to report on. For instance, you may want to grant
``Verified +/-1`` and ``Submit`` to the user. Additional categories
or values may be added to Gerrit. Zuul is very flexible and can take
advantage of those.
Connection Configuration
------------------------
The supported options in ``zuul.conf`` connections are:
.. attr:: <gerrit connection>
.. attr:: driver
:required:
.. value:: gerrit
The connection must set ``driver=gerrit`` for Gerrit connections.
.. attr:: server
Fully qualified domain name of Gerrit server.
.. attr:: canonical_hostname
The canonical hostname associated with the git repos on the
Gerrit server. Defaults to the value of
:attr:`<gerrit connection>.server`. This is used to identify
projects from this connection by name and in preparing repos on
the filesystem for use by jobs. Note that Zuul will still only
communicate with the Gerrit server identified by ``server``;
this option is useful if users customarily use a different
hostname to clone or pull git repos so that when Zuul places
them in the job's working directory, they appear under this
directory name.
.. attr:: port
:default: 29418
Gerrit server port.
.. attr:: baseurl
Path to Gerrit web interface.
.. attr:: user
:default: zuul
User name to use when logging into Gerrit via ssh.
.. attr:: sshkey
:default: ~zuul/.ssh/id_rsa
Path to SSH key to use when logging into Gerrit.
.. attr:: keepalive
:default: 60
SSH connection keepalive timeout; ``0`` disables.
Trigger Configuration
---------------------
Zuul works with standard versions of Gerrit by invoking the ``gerrit
stream-events`` command over an SSH connection. It also reports back
to Gerrit using SSH.
If using Gerrit 2.7 or later, make sure the user is a member of a group
that is granted the ``Stream Events`` permission, otherwise it will not
be able to invoke the ``gerrit stream-events`` command over SSH.
.. attr:: pipeline.trigger.<gerrit source>
The dictionary passed to the Gerrit pipeline ``trigger`` attribute
supports the following attributes:
.. attr:: event
:required:
The event name from gerrit. Examples: ``patchset-created``,
``comment-added``, ``ref-updated``. This field is treated as a
regular expression.
.. attr:: branch
The branch associated with the event. Example: ``master``.
This field is treated as a regular expression, and multiple
branches may be listed.
.. attr:: ref
On ref-updated events, the branch parameter is not used, instead
the ref is provided. Currently Gerrit has the somewhat
idiosyncratic behavior of specifying bare refs for branch names
(e.g., ``master``), but full ref names for other kinds of refs
(e.g., ``refs/tags/foo``). Zuul matches this value exactly
against what Gerrit provides. This field is treated as a
regular expression, and multiple refs may be listed.
.. attr:: ignore-deletes
:default: true
When a branch is deleted, a ref-updated event is emitted with a
newrev of all zeros specified. The ``ignore-deletes`` field is a
boolean value that describes whether or not these newrevs
trigger ref-updated events.
.. attr:: approval
This is only used for ``comment-added`` events. It only matches
if the event has a matching approval associated with it.
Example: ``Code-Review: 2`` matches a ``+2`` vote on the code
review category. Multiple approvals may be listed.
.. attr:: email
This is used for any event. It takes a regex applied on the
performer email, i.e. Gerrit account email address. If you want
to specify several email filters, you must use a YAML list.
Make sure to use non greedy matchers and to escapes dots!
Example: ``email: ^.*?@example\.org$``.
.. attr:: username
This is used for any event. It takes a regex applied on the
performer username, i.e. Gerrit account name. If you want to
specify several username filters, you must use a YAML list.
Make sure to use non greedy matchers and to escapes dots.
Example: ``username: ^zuul$``.
.. attr:: comment
This is only used for ``comment-added`` events. It accepts a
list of regexes that are searched for in the comment string. If
any of these regexes matches a portion of the comment string the
trigger is matched. ``comment: retrigger`` will match when
comments containing ``retrigger`` somewhere in the comment text
are added to a change.
.. attr:: require-approval
This may be used for any event. It requires that a certain kind
of approval be present for the current patchset of the change
(the approval could be added by the event in question). It
follows the same syntax as :attr:`pipeline.require.<gerrit
source>.approval`. For each specified criteria there must exist
a matching approval.
.. attr:: reject-approval
This takes a list of approvals in the same format as
:attr:`pipeline.trigger.<gerrit source>.require-approval` but
will fail to enter the pipeline if there is a matching approval.
Reporter Configuration
----------------------
Zuul works with standard versions of Gerrit by invoking the
``gerrit`` command over an SSH connection. It reports back to
Gerrit using SSH.
The dictionary passed to the Gerrit reporter is used for ``gerrit
review`` arguments, with the boolean value of ``true`` simply
indicating that the argument should be present without following it
with a value. For example, ``verified: 1`` becomes ``gerrit review
--verified 1`` and ``submit: true`` becomes ``gerrit review
--submit``.
A :ref:`connection<connections>` that uses the gerrit driver must be
supplied to the trigger.
Requirements Configuration
--------------------------
As described in :attr:`pipeline.require` and :attr:`pipeline.reject`,
pipelines may specify that items meet certain conditions in order to
be enqueued into the pipeline. These conditions vary according to the
source of the project in question. To supply requirements for changes
from a Gerrit source named ``my-gerrit``, create a configuration such
as the following:
.. code-block:: yaml
pipeline:
require:
my-gerrit:
approval:
- Code-Review: 2
This indicates that changes originating from the Gerrit connection
named ``my-gerrit`` must have a ``Code-Review`` vote of ``+2`` in
order to be enqueued into the pipeline.
.. attr:: pipeline.require.<gerrit source>
The dictionary passed to the Gerrit pipeline `require` attribute
supports the following attributes:
.. attr:: approval
This requires that a certain kind of approval be present for the
current patchset of the change (the approval could be added by
the event in question). It takes several sub-parameters, all of
which are optional and are combined together so that there must
be an approval matching all specified requirements.
.. attr:: username
If present, an approval from this username is required. It is
treated as a regular expression.
.. attr:: email
If present, an approval with this email address is required. It is
treated as a regular expression.
.. attr:: older-than
If present, the approval must be older than this amount of time
to match. Provide a time interval as a number with a suffix of
"w" (weeks), "d" (days), "h" (hours), "m" (minutes), "s"
(seconds). Example ``48h`` or ``2d``.
.. attr:: newer-than
If present, the approval must be newer than this amount
of time to match. Same format as "older-than".
Any other field is interpreted as a review category and value
pair. For example ``Verified: 1`` would require that the
approval be for a +1 vote in the "Verified" column. The value
may either be a single value or a list: ``Verified: [1, 2]``
would match either a +1 or +2 vote.
.. attr:: open
A boolean value (``true`` or ``false``) that indicates whether
the change must be open or closed in order to be enqueued.
.. attr:: current-patchset
A boolean value (``true`` or ``false``) that indicates whether the
change must be the current patchset in order to be enqueued.
.. attr:: status
A string value that corresponds with the status of the change
reported by the trigger.
.. attr:: pipeline.reject.<gerrit source>
The `reject` attribute is the mirror of the `require` attribute. It
also accepts a dictionary under the connection name. This
dictionary supports the following attributes:
.. attr:: approval
This takes a list of approvals. If an approval matches the
provided criteria the change can not be entered into the
pipeline. It follows the same syntax as
:attr:`pipeline.require.<gerrit source>.approval`.
Example to reject a change with any negative vote:
.. code-block:: yaml
reject:
my-gerrit:
approval:
- Code-Review: [-1, -2]