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README: Document --patches

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Michal Sojka 2024-12-28 17:06:30 +01:00
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README.md
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@ -89,6 +89,21 @@ the [Autoware][] project as an example.
> configuration, you may need to add `--experimental-features
> 'nix-command flakes'`).
3. If some packages need changes, you can generate Nix expressions
with appropriate patches. Commit the needed changes and run
`ros2nix` with the `--patches` flag, e.g.:
```sh
pushd autoware/src/...package...
$EDITOR some-file.cxx
git commit some-file.cxx
popd
ros2nix --output-as-nix-pkg-name --fetch --patches $(find -name package.xml|grep -v ament_cmake)
```
An example of the resulting Nix expression can be seen
[here](https://github.com/wentasah/autoware.nix/blob/68772be6c4c263cfa213921e205f27f68dc4826a/pkgs/autoware-universe-utils.nix#L15-L18).
[Autoware]: https://autoware.org/
## ros2nix reference