Follow these instructions to collaborate on AGL through the Gerrit review system.

Please be sure that you are subscribed to the mailing list and of course, you can reach out on IRC at the #automotive channel on irc.libera.chat

Gerrit assigns the following roles to users:

• Submitters: May submit changes for consideration, review other code changes, and make recommendations for acceptance or rejection by voting +1 or -1, respectively.
• Maintainers: May approve or reject changes based upon feedback from reviewers voting +2 or -2, respectively.

Getting deeper into Gerrit¶

A comprehensive walk-through of Gerrit is beyond the scope of this document. There are plenty of resources available on the Internet. A good summary can be found here and Basic Gerrit Walkthrough for GitHub Users.

Working with a local clone of the repository¶

To work on something, whether a new feature or a bugfix:

1. Open the Gerrit repo page.

2. Select the repository you wish to work on.

3. Open a terminal window and clone the project locally using the Clone with git hook URL. Be sure that ssh is also selected, as this will make authentication much simpler. For example, for documentation repository:

   $ git clone "ssh://<LFID>@gerrit.automotivelinux.org:29418/AGL/documentation" && scp -p -P
   29418 <LFID>@gerrit.automotivelinux.org:hooks/commit-msg "documentation/.git/hooks/"
   

4. Setup user and email for git config

    $ cd documentation
    $ git config --global user.name "Your Full Name"
    $ git config --global user.email "your@email.com"
   

   NOTE: To only configure for a particular repository :

    $ cd documentation
    $ git config user.name "Your Full Name"
    $ git config user.email "your@email.com"
   

5. Create a descriptively-named branch off of your cloned repository

    $ git checkout -b issue-nname
   

Using git review¶

There's a very useful tool for working with Gerrit called git-review. This command-line tool can automate most of the ensuing sections for you. Ofcourse, reading the information below is also highly recommended so that you understand what's going on behind the scenes.

# for first time use only
$ git review -s

[remote "gerrit"]
   url = ssh://<LFID>@gerrit.automotivelinux.org:29418/AGL/documentation.git
   fetch = +refs/heads/*:refs/remotes/gerrit/*

Then submit your change with git review.

$ cd documentation
$ git review

When you update your patch, you can commit with git commit --amend, and then repeat the git review command.

Typical Review Workflow¶

• New Fresh Change

  $ cd documentation                              # Working Repository
  $ git remote -v update                          # Updating wrt remote
  $ git checkout -b mytopicbranch origin/master   # Creating new branch
  ### CODE the CHANGES
  $ git add  <file>                               # Track the changed files
  $ git commit -s                                 # Signed Commit Message
  $ git review                                    # Submit Changes to review
  

• Updating existing Gerrit Review

  $ cd documentation                              # Working Repository
  $ git review -d 25678                           # Download review, 25678 is change number
  ### CODE the CHANGES
  $ git add  <file>                               # Track the changed files
  $ git commit -s                                 # Signed Commit Message
  $ git review                                    # Submit Changes to review
  $ git checkout master                           # Return to master branch
  

Reviewing Using Gerrit¶

• Add: This button allows the change submitter to manually add names of people who should review a change; start typing a name and the system will auto-complete based on the list of people registered and with access to the system. They will be notified by email that you are requesting their input.

• Abandon: This button is available to the submitter only; it allows a committer to abandon a change and remove it from the merge queue.

• Change-ID: This ID is generated by Gerrit (or system). It becomes useful when the review process determines that your commit(s) have to be amended. You may submit a new version; and if the same Change-ID header (and value) are present, Gerrit will remember it and present it as another version of the same change.

• Status: Currently, the example change is in review status, as indicated by “Needs Verified” in the upper-left corner. The list of Reviewers will all emit their opinion, voting +1 if they agree to the merge, -1 if they disagree. Gerrit users with a Maintainer role can agree to the merge or refuse it by voting +2 or -2 respectively.

Notifications are sent to the email address in your commit message's Signed-off-by line. Visit your Gerrit dashboard, to check the progress of your requests.

The history tab in Gerrit will show you the in-line comments and the author of the review.