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CONTRIBUTING.md: add section "Backporting changes"

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Leonhard Markert 2020-01-10 12:59:28 +01:00
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@ -48,6 +48,15 @@ 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.
## Backporting changes
To [backport a change into a release branch](https://nixos.org/nixpkgs/manual/#submitting-changes-stable-release-branches):
1. Take note of the commit in which the change was introduced into `master`.
2. Check out the target _release branch_, e.g. `release-19.09`. Do not use a _channel branch_ like `nixos-19.09` or `nixpkgs-19.09`.
3. Use `git cherry-pick -x <original commit>`.
4. Open your backport PR. Make sure to select the release branch (e.g. `release-19.09`) as the target branch of the PR, and link to the PR in which the original change was made to `master`.
## Reviewing contributions
See the nixpkgs manual for more details on how to [Review contributions](https://nixos.org/nixpkgs/manual/#chap-reviewing-contributions).