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laforge, 05/28/2016 12:02 PM
add some rationale as well as further information


Contributing using Gerrit

At OsmoDevCon2016 we discussed problems with our past contribution / patch submission process using mails on the mailing list as well as patchwork. The result is that we want to give Gerrit a try for some time and see if it helps us to have a better process

Gerrit is a review tool that integrates nicely with git and ssh. You can find general information about Gerrit at https://www.gerritcodereview.com/

The advantages of Gerrit are:
  • patch submission status is automatically tracked, also with several revisions for a patch set.
  • patches are build-tested (and possibly even further tested) by jenkins before they are applied
  • developers + maintainers can formally vote on a patch (developer: -1/0/+1, maintainer: -2/0/+2)
  • once a patch has +2 score, it can be (automatically) merged into master
  • patch sumissions not via git send-email but direcly from git

Osmocom Subprojects using Gerrit

The following projects use Gerrit to contribute changes:

  • libosmocore.git
  • libosmo-abis.git
  • libosmo-netif.git
  • libosmo-sccp.git
  • libsmpp34.git
  • openbsc.git
  • osmo-bts.git
  • osmo-iuh.git
  • osmo-pcu.git
  • cellmgr-ng.git
  • osmo-sip-connector.git

Configuring Gerrit/Account

You will need to sign-up at https://gerrit.osmocom.org/login/. If you have an Osmocom Redmine account you can use https://osmocom.org/openid as OpenID provider. If you have no Osmocom redmine account, you can simply create one online at the "Register" link in the upper right corner.

Even without an existing or new redmine account, you should also be able to use any other OpenID provider to authenticate against gerrit (untested).

After the initial sign-up you will need to:

  • Pick a username (can not be changed)
  • Add your public ssh key(s)
  • Add email addresses you intend to use as author/comitter

Setting up Gerrit for commits and pushing

  • Add the remote to be able to fetch and push to gerrit
  • Fetch the commit hook that adds Change-Id to each commit to uniquely identify a commit
USERNAME=gerrit_user_name
PROJECT=$(basename $PWD)
git remote add gerrit ssh://$USERNAME@gerrit.osmocom.org:29418/$PROJECT.git
scp -P 29418 $USERNAME@gerrit.osmocom.org:hooks/commit-msg .git/hooks/
  • In case your local username matches the gerrit username, the setup shortens to
PROJECT=$(basename $PWD)
git remote add gerrit ssh://gerrit.osmocom.org:29418/$PROJECT.git
scp -P 29418 gerrit.osmocom.org:hooks/commit-msg .git/hooks/

Then

  • Push for review
    git push gerrit HEAD:refs/for/master
    
  • Push a user branch
    git push gerrit HEAD:refs/heads/users/$USERNAME/topic
    
  • Directly push to master if you are allowed to
    git push gerrit HEAD:refs/heads/master
    
  • List changesets in gerrit
    git ls-remote gerrit changes/*
    
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