Gerrit

Installation

Gerrit can be downloaded from the Gerrit Code Review web site, and also contains Gerrit documentation with installation instructions.

Create a Zuul User

The Gerrit documentation walks you through adding a first user, which will end up being the admin user. Once the admin user is created, and SSH access has been setup for that user, you can use that account to create a new zuul user. This user, which will be used by our Zuul installation, must have SSH access to gerrit, and have the stream-events ACL enabled.

As the admin user, create the zuul user, and import an SSH key for zuul:

cat $PUBKEY | ssh -p 29418 $USER@localhost gerrit create-account \
  --group "'Registered Users'" --ssh-key - zuul

$PUBKEY is the location of the SSH public key for the zuul user. $USER is the username for the admin user.

The zuul user should now be able to stream events:

ssh -p 29418 zuul@localhost gerrit stream-events

Configure Gerrit

The zuul user (and any other users you may create, for that matter) will need to be able to leave review votes on any project hosted in your Gerrit. This is done with the use of Gerrit Review Labels. You may need to add the proper label permissions to the All-Projects project, which defines ACLs that all other projects will inherit.

Visting Projects -> List -> All-Projects -> Access in your Gerrit lets you see the current access permissions. In the Reference: refs/heads/* section, you will need to add a permisson for the Label Code-Review for the Registered Users group (we added the zuul user to this group when we created it).

Note

The label you configure here must match the label referenced in your Zuul pipeline definitions. We've chosen the Code-Review label here as an example.

Create a New Project

The admin user can create new projects in Gerrit, which users can then clone and use to submit code changes. Zuul will monitor the Gerrit event stream for these submissions.

To create a new project named 'demo-project':

ssh -p 29418 $USER@localhost gerrit create-project demo-project --empty-commit

Modify the Project

Clone the project:

git clone ssh://$USER@localhost:29418/demo-project.git

Install the change ID hook that Gerrit requires:

cd demo-project
scp -p -P 29418 $USER@localhost:hooks/commit-msg .git/hooks/

Now you are ready to modify the project and push the changes to Gerrit:

echo "test" > README.txt
git add .
git commit -m "First commit"
git push origin HEAD:refs/for/master

You should now be able to see your change in Gerrit.

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