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CONTRIBUTING: rebase master to staging without pinging people

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Co-Authored-By: Martin Weinelt <hexa@darmstadt.ccc.de>
Co-Authored-By: Janne Heß <janne@hess.ooo>
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Jörg Thalheim 2022-03-30 22:41:57 +02:00
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CONTRIBUTING.md
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@ -52,6 +52,35 @@ In addition to writing properly formatted commit messages, it's important to inc
For package version upgrades and such a one-line commit message is usually sufficient.
## Rebasing between branches (i.e. from master to staging)
From time to time, changes between branches must be rebased, for example, if the
number of new rebuilds they would cause is too large for the target branch. When
rebasing, care must be taken to include only the intended changes, otherwise
many CODEOWNERS will be inadvertently requested for review. To achieve this,
rebasing should not be performed directly on the target branch, but on the merge
base between the current and target branch.
In the following example, we see a rebase from `master` onto the merge base
between `master` and `staging`, so that a change can eventually be retargeted to
`staging`. The example uses `upstream` as the remote for `NixOS/nixpkgs.git`
while the `origin` remote is used for the remote you are pushing to.
```console
# Find the common base between two branches
common=$(git merge-base upstream/master upstream/staging)
# Find the common base between your feature branch and master
commits=$(git merge-base $(git branch --show-current) upstream/master)
# Rebase all commits onto the common base
git rebase --onto=$common $commits
# Force push your changes
git push origin $(git branch --show-current) --force-with-lease
```
Then change the base branch in the GitHub PR with the "Edit" button in the top
right corner, i.e. `master` → `staging`.
## Backporting changes
Follow these steps to backport a change into a release branch in compliance with the [commit policy](https://nixos.org/nixpkgs/manual/#submitting-changes-stable-release-branches).