126 lines
5 KiB
Markdown
126 lines
5 KiB
Markdown
---
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title: "Contributing"
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description: ""
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summary: ""
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date: 2025-03-14T14:14:35+01:00
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lastmod: 2025-03-14T14:14:35+01:00
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draft: false
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weight: 12
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toc: true
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---
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You want to start contributing? Nice!
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We do use [Gerrit](https://www.gerritcodereview.com) for Code Review.
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It allows a more granular review (per-commit granularity rather than PR
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granularity), as well as keeping track as how commits change over time.
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It greatly simplifies the review process, and leads to overall more high-quality
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contributions.
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While it might initially look a bit intimidating, you hopefully will spend less
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time learning its workflow than writing actual Snix code.
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<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="icon icon-tabler icons-tabler-outline icon-tabler-mood-wink-2"><path stroke="none" d="M0 0h24v24H0z" fill="none"/><path d="M12 21a9 9 0 1 1 0 -18a9 9 0 0 1 0 18z" /><path d="M9 10h-.01" /><path d="M14.5 15a3.5 3.5 0 0 1 -5 0" /><path d="M15.5 8.5l-1.5 1.5l1.5 1.5" /></svg>
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{{<callout>}}
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This assumes you have the repo already cloned and the necessary tools installed
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as described in [Building Snix]({{< relref "./building" >}}), so make sure you
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went through these instructions first.
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{{</callout>}}
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### Creating a Gerrit account
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- Navigate to [our Gerrit instance][snix-gerrit]. Hit the "Sign in" button
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(which allows SSO with some common IdPs)
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- In the User settings, paste an SSH public key and hit the "Add New SSH key"
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button. [^1]
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- Alternatively, you can also create "HTTP Credentials" (though saving the HTTP
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password is messy).
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### Update your git remote URL
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Instead of trying to push to Forgejo, reconfigure your git remote URL to
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interact with Gerrit directly.
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Replace `$USER` with your `Username` shown in the Gerrit settings.
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#### If using SSH authentication:
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```console
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$ git remote set-url origin "ssh://$USER@cl.snix.dev:29418/snix"
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```
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#### If using HTTP authentication:
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```console
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$ git remote set-url origin "https://$USER@cl.snix.dev/a/snix"
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```
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<!-- TODO: fix replication to include refs/changes/… etc, and ensure it
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replicates fast enough, then update to --push only -->
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### Install the commit-msg hook
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Gerrit uses a `commit-msg` hook to add a `Change-Id: …` field to each commit
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message if not present already. This allows Gerrit to identify new revisions /
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updates of old commits, and track them as new revisions of the same "CL" [^2].
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To install the commit-msg hook, run the following from the repo root:
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```console
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mkdir -p .git/hooks
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curl -Lo .git/hooks/commit-msg https://cl.snix.dev/tools/hooks/commit-msg
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chmod +x .git/hooks/commit-msg
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```
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{{< callout context="tip" title="Did you know?" icon="outline/rocket" >}}
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Gerrit refuses receiving commits without these `Change-Id: …` fields.
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If you already have some local commits without `Change-Id` field, `git commit
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--amend` them after installing the `commit-msg` hook to add them.
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{{< /callout >}}
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### Push your changes
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Do some local changes, and push them to Gerrit as follows:
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```console
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$ git push origin HEAD:refs/for/canon
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```
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Gerrit will print links to newly created CLs to your terminal.
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If you want to update/edit your CL, simply squash these changes into your local
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commit and push again.
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### The Gerrit model
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If do not have experience with the Gerrit, consider reading the
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[<cite>Working with Gerrit: An example</cite>][Gerrit Walkthrough] or
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[<cite>Basic Gerrit Walkthrough — For GitHub Users</cite>][gerrit-for-github-users].
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Some more tips:
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* Assign a reviewer to review your changes.
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* React on comments and mark them as resolved once you did.
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* Comments are only "Drafts" (stored server-side) until you send them off.
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This can be done by the `Reply` button on the top, for example.
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* Once CI is green, it's up to the *Author* of the CL to submit, not the
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reviewer.
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If you want a bot to automatically submit in this case, you can add the
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`Autosubmit+1` label.
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* Rebase on `origin/canon` regularly. You cannot push if you still have an old
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version of a now-submitted CL in your git log.
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{{< callout context="tip" title="Did you know?" icon="outline/rocket" >}}
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You can immediately assign reviewers and other fields while pushing a
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new/updated change, by adding it to the push URL.
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```console
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$ git push origin HEAD:refs/for/canon%r=alice,cc=bob,l=Autosubmit+1,publish-comments
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```
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* will set `alice` as a reviewer
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* will set `bob` as CC
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* adds the `Autosubmit+1` label
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* publishes any outstanding draft comments
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{{< /callout >}}
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[snix-gerrit]: https://cl.snix.dev
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[Gerrit walkthrough]: https://gerrit-review.googlesource.com/Documentation/intro-gerrit-walkthrough.html
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[gerrit-for-github-users]: https://gerrit.wikimedia.org/r/Documentation/intro-gerrit-walkthrough-github.html
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[^1]: currently, `ssh-*-sk` keytypes are not supported, so use an `ssh-ed25519` key.
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[^2]: abbreviation for "change list", and the review unit in Gerrit.
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