gitlab.rst

Intended audience

Contributors

Submitting code to SWH

We use gitlab (Community Edition) as the coding/collaboration forge.

For a new contributor

You will need an account in SWH gitlab for contributing code or documentation. Please follow the steps below to setup your account.

• Signup to create a gitlab account.
• Account approve and land is manual and could take a while. Once approved, you will get a notification.
• If you are not already, familiarize with git and gitlab.
• Setup ssh keys to communicate with SWH Gitlab.
• Sign the Software Heritage Contributor License Agreement. Please contact us to know more about this.

Development workflow

We use a fork based workflow and merge requests for code contributions. In order to submit a feature or for any edits in the code, please adhere to the steps below:

• Create a fork of the project you wish to contribute to in your personal namespace.
• Clone your forked repository and start working. It is strongly recommended to work on a feature branch.
• Make commits following the SWH best practices.
• Push your branch to your forked repository.
• Create a merge request against the SWH repository.
• Make sure the merge request passes the CI build.
• Address the review comments, if any, and wait for an approval.
• Once approved, a team member will merge your changes to the master branch.

Quick start script

note: If you haven’t done already, setup the swh-environment before this. Refer to the :ref:`getting started <getting-started>` for details.

A script using python-gitlab is available to partially automate the above workflow. Using this script is recommended as it simplifies the complexities associated with the build pipelines and multiple remotes. You can use the script by following the steps below:

Create an access token with api and write repository scopes here. The script will use this token to create a fork in your namespace and to add jenkins as a user with developer permissions. Create or update the config file :file:`~/.python-gitlab.cfg` and add the following content.

[swh]
url = https://gitlab.softwareheritage.org
private_token = <your generated token>
api_version = 4

In the following command line excerpts, we will use swh-objstorage as example. Please, replace that with the repository you wish to work with.

Run the script by

$ cd swh-environment
$ bin/update   # Used to update all the repos under the environment to their latest version
$ bin/fork-gitlab-repo -g swh swh-objstorage

This will create a new fork of the SWH repository in your namespace and add a jenkins user to perform automatic builds. You can view the forked project in your personal projects here. Switch to your local copy that is now ready for code contributions. You can find an extra remote named ‘forked’. This points to your forked repository and that can be used to push your changes.

$ cd swh-objstorage
$ git remote -v
forked  https://gitlab.softwareheritage.org/<username>/swh-objstorage.git (fetch)
forked  git@gitlab.softwareheritage.org:/<username>/swh-objstorage.git (push)
origin  https://gitlab.softwareheritage.org/swh/devel/swh-objstorage.git (fetch)
origin  git@gitlab.softwareheritage.org:/swh/devel/swh-objstorage.git (push)

SSH key for pushes

In your forge User Settings page (on the top right, click on your avatar, then click Preferences), you have access to the SSH Keys section. You then have the option to upload a SSH public key, which will authenticate your pushes from git.

For more convenience (but not mandatory), you can also configure your ssh/git to use that key pair, for instance by editing the ~/.ssh/config file:

# .ssh/config entry for gitlab.softwareheritage.org
Host gitlab.softwareheritage.org
User git IdentityFile ~/.ssh/swh_gitlab_key
IdentitiesOnly yes
PreferredAuthentications publickey

Finally, you should configure git to push over ssh when pushing to https://gitlab.softwareheritage.org, by running the following command:

git config --global url.git@gitlab.softwareheritage.org:.pushInsteadOf https://gitlab.softwareheritage.org

This lets git know that it should use git@gitlab.softwareheritage.org: as a base url when pushing repositories cloned from gitlab.softwareheritage.org over https.

If you plan to sign git revisions or tags, you may also want to upload your GPG key as well.