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Overview

The Asterisk project uses Gerrit for code reviews, continuous integration validation, and git management. When creating a patch to Asterisk or its various related projects, all patches should be pushed to Gerrit for review.

Use of Gerrit is beyond the scope of this wiki page - for in depth information, see the Gerrit documentation.

Creating an Account

Gerrit uses OpenID in conjunction with the Asterisk project's Atlassian infrastructure to provide single sign-on. If you already have an account in the Asterisk project infrastructure (such as JIRA) and have signed a Contributor License Agreement, you should be able to sign in to Gerrit automatically.

  1. Create an account at signup.asterisk.org.

  2. Sign a Contributor License Agreement.

    Icon

    Until your Contributor License Agreement is approved, you will not be able to sign into the project OpenID provider or Gerrit.

  3. Browse to Gerrit, and click Sign In.

  4. This will redirect to openid.asterisk.org. Sign in with your Atlassian username/password.

  5. Upon signing in successfully, you will need to authorize Gerrit to access your OpenID. When you have done so, you should be redirected back to Gerrit, and will be signed in.

Setting up your Gerrit Account

Upon logging in for the first time, you will need to perform the following:

  1. Set your username for your account. This can be any username, although we highly recommend matching your Atlassian username. To set your username:
    1. Click on your name in the top-right corner.
    2. Click "Settings"
    3. Click "Profile" on the left side of the screen.
    4. In the top text box in the center, enter your user name, and confirm.

      Icon

      Failure to set your username will result in clones using SSH failing, despite adding your SSH key. If you can not clone using SSH please ensure you have set your username.

  2. Add your SSH public key.

Cloning from Gerrit

While access to the underlying git repository is open to anyone via anonymous HTTP access, this guide will assume that you want to push changes up as well. For that, Gerrit uses SSH. If you are only looking to obtain the source code for a particular repository, you may just use the HTTP methods shown below.

  1. Clone the repository:
    1. SSH:

    2. HTTP:

    3. Anonymous HTTP:

  2. You can clone a specific repo branch only:
    1. Cloning Asterisk branch 13 via HTTP to the "asterisk-13" folder:

  3. Copy the commit-msg hook into your local .git/hooks folder:

    1. If you have git-review installed:

    2. Otherwise:

      The commit-msg hook adds the Change-Id automatically to git commit messages. A Change-Id is necessary for Gerrit to associate multiple patch sets together. For more information, see Change-Ids.

Creating an SSH Alias

Since access to gerrit.asterisk.org is likely to occur often, you may want to set up an SSH alias:

This will allow you to access the repository as shown below:

Pushing to Gerrit for Code Review

There are multiple ways to push changes to Gerrit for code review, the easiest of which is to use git review. When committing changes, be sure to follow the Commit Messages guide.

Use git review

  1. Install git-review:

  2. Submit the changes! Here are a few different ways:

    • To submit a change to master as a draft:

    • To submit a change to master:

      Note that this will automatically publish the change to the asterisk-code-review mailing list!

    • To submit a change for a particular branch:

    • To submit a change, including the ASTERISK issue if there is one as the topic for the review:

Use git push

Use git review

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While you can always use git push instead of git review, using git review is highly recommended. It was designed for use with Gerrit, and makes your life much easier.

Pushing to Gerrit for code review can always be done using standard git commands. This is done by pushing to the refs/for/[branch]. Generally, this will be master, unless pushing to a particular mainline Asterisk branch.

Updating a Review

  1. Reviews are automatically updated so long as commits contain the same Change ID. If your review has any findings, rebase the commits as appropriate, making sure the Change ID is preserved:

  2. Re-push the changes:

    or:

Branch Cherry-Picking

Patches being submitted to the project must be cherry-picked to other branches when either:

  • The patch is a bug fix. In this case, the patch should be cherry-picked to all supported branches that have the bug.
  • The patch is a new feature or improvement, and tests have been written to cover the new feature or improvement. In that case, the patch may be submitted to other supported branches.

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    Not all changes are appropriate for all branches. See Software Configuration Management Policies for more information. If you have questions about whether or not a change is appropriate for a particular branch, feel free to ask on the asterisk-dev mailing list or in #asterisk-dev.

Cherry-picking can be done either when a patch is first proposed, or it may be done when the patch has been reviewed but prior to it being submitted. If you plan on cherry-picking after an initial review, please indicate so in a comment on the review.

Cherry-Picking in Gerrit

If your patch applies cleanly to a branch, you can cherry-pick directly in Gerrit. On your review, select the Cherry-Pick button:

In the resulting dialog, enter the branch you want to cherry-pick to, then select Cherry Pick Change.

If the change merges cleanly, a new review will be opened with your cherry-picked change. If the change could not be merged, and error will appear and you will need to use one of the manual methods listed below.

Cherry-Picking using git review

If you have already submitted a patch for review, you may cherry pick to a new branch using git review:

As an example, if we previously posted for review a code change for Asterisk 11, and the Gerrit Review ID is 30, we might use the following for Asterisk 13:

Cherry-Picking using git cherry-pick

You may cherry pick using git cherry-pick as well. When performing the cherry-pick using git, make sure that the Change-Id header is the same between all branches.

As an example, if we committed the following to Asterisk 13:

We could then cherry pick this back to Asterisk 11 using the following:

The resulting commit must have the same Change-Id as the Asterisk 13 commit for Gerrit to recognize that this is a cherry-picked commit:

When posting it for review to Gerrit, you should also use the same topic as the original patch. Generally, this is the ASTERISK issue.

Team Branches

The repositories on Gerrit typically require all changes in all of the mainline branches to be reviewed prior to merging. While this is appropriate for the mainline branches, sometimes, it is useful to have a branch on the central server that multiple developers can use for collaboration. These branches exist within a special branch namespace, team. Registered Gerrit users have the ability to manipulate branches within that namespace directly, bypassing the usual Gerrit code review process.

Posting For Peer Review

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When a code change in a team branch is ready for peer review, using the git review tool or pushing the change to Gerrit's refs/for/[branch] will still automatically post it for review on Gerrit. The instructions on this page assume that developers wanting to use team branches want to perform some development collaboratively without posting the change for review.

For instruction on posting a change for review, see Pushing to Gerrit for Code Review.

Team Branch Manipulation in Gerrit

Creating a new Team Branch

Creating a new team branch can be done at any time from a local branch. For example, to create a new team branch from local master:

 Check out a Team Branch

Checking out a team branch is done in the same way as a mainline branch:

Pushing to a Team Branch

Pushing to a team branch can be done directly. This bypasses Gerrit's peer review. Note that team branches can be peer reviewed if desired, using the same mechanism as a 'normal' Gerrit peer review.

Delete a Team Branch

Deleting a team branch is done by pushing an empty local branch (nothing) to the team branch. Note that you have to use git push --force.

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It should go without saying, but be careful when deleting a team branch. All registered users have access rights to the team area - as such, anyone can affect someone else's team branch.

Recovering a Subversion Team Branch

While the Subversion Team branches were moved over to Git with their entire history, much of that history typically consists of Automerge commits. These commits are not well understood by Git; from Git's perspective, they are completely independent from the mainline commits they merged over. This can cause a "standard" rebase to fail miserably: the rebase will not realize that the Automerge commits are identical to those on the branch being rebased to. As a result, you'll often have a lot of merge conflicts if you attempt to rebase directly.

While working through the merge conflicts in a rebase is an option, an easier approach may be to simply re-build the branch on the current state of the mainline branch it wants to track. This example walks through that process, performing a rebase of branch team/mjordan/trunk-http-stuff-and-things on top of master.

  1. Checkout the subversion team history branch into a temporary local branch:

  2. Determine the useful commits to pull over. In this case, we're going to skip:
    1. All commits from Automerge script.
    2. All commits that modify Subversion properties or create Subversion branches.

      In the above screenshot, we want the three commits from Matthew Jordan between the Automerge: script automerge cancel and the Matthew Jordan: Re-enable automerge.
    3. Record the hashes of the commits you want to carry-over.
  3. Checkout a new branch for your work, tracking whatever canonical mainstream branch is appropriate:

  4. Cherry-pick each commit over, solving merge conflicts as necessary:

  5. If desired, fix up any history:

  6. Remove the temporary branch:

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    You may get the following warning:

    That's okay. You don't want to merge the whole thing to HEAD, as the Automerge script commits are duplicates of commits already in HEAD.

  7. Push the branch up to your team branch location:

    Icon

    In this example, a new team branch is being made - team/mjordan/http-caching. This way, if something is missed in the cherry-picks, I haven't blown away my Subversion branch.

Troubleshooting

git-review

Problem: attempting to run git review results in something like the following:

Traceback (most recent call last):
  File "/usr/local/bin/git-review", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.6/dist-packages/git_review/cmd.py", line 1132, in main
    (os.path.split(sys.argv[0])[-1], get_version()))
  File "/usr/local/lib/python2.6/dist-packages/git_review/cmd.py", line 180, in get_version
    provider = pkg_resources.get_provider(requirement)
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 176, in get_provider
    return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 648, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 546, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: git-review

Solution: Run

$ sudo pip install --upgrade setuptools

on your command line

Problem: attempting to run git review results in "unpack failed: error Missing tree":

Description:  There is an incompatibility between certain version of git and gerrit that causes this error when the commit to be pushed was amended and only the commit message changed.
Solution:  Run git push manually with the --no-thin option:

$ git push --no-thin asterisk:{repo} HEAD:refs/for/master

Problem:  Unable to login to gerrit.asterisk.org

Solution: Until your Contributor License Agreement is approved, you will not be able to sign into the project OpenID provider or Gerrit. See the "Creating an Account" section for instructions on how to resolve this.

Problem:  Unable to unsubscribe from Gerrit notifications

Solution: You may have mistaken the Gerrit notifications on a mailing list for notifications associated with your account. Of course if the notifications are being received via a mailing list then you would need to unsubscribe from the entire mailing list to stop receiving related mailings.

Other possibilities are that you have multiple accounts or are receiving notifications via forwarding from another E-mail address.

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