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Merge pull request #26501 from knedlsepp/add-python-overlay-example

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Python docs: Add example for overlays
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Jörg Thalheim 2017-06-10 11:58:48 +01:00 committed by GitHub
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doc/languages-frameworks/python.md
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@ -923,6 +923,28 @@ If you need to change a package's attribute(s) from `configuration.nix` you coul
If you are using the `bepasty-server` package somewhere, for example in `systemPackages` or indirectly from `services.bepasty`, then a `nixos-rebuild switch` will rebuild the system but with the `bepasty-server` package using a different `src` attribute. This way one can modify `python` based software/libraries easily. Using `self` and `super` one can also alter dependencies (`buildInputs`) between the old state (`self`) and new state (`super`). If you are using the `bepasty-server` package somewhere, for example in `systemPackages` or indirectly from `services.bepasty`, then a `nixos-rebuild switch` will rebuild the system but with the `bepasty-server` package using a different `src` attribute. This way one can modify `python` based software/libraries easily. Using `self` and `super` one can also alter dependencies (`buildInputs`) between the old state (`self`) and new state (`super`).
### How to override a Python package using overlays?
To alter a python package using overlays, you would use the following approach:
```nix
self: super:
rec {
python = super.python.override {
packageOverrides = python-self: python-super: {
bepasty-server = python-super.bepasty-server.overrideAttrs ( oldAttrs: {
src = self.pkgs.fetchgit {
url = "https://github.com/bepasty/bepasty-server";
sha256 = "9ziqshmsf0rjvdhhca55sm0x8jz76fsf2q4rwh4m6lpcf8wr0nps";
rev = "e2516e8cf4f2afb5185337073607eb9e84a61d2d";
};
});
};
};
pythonPackages = python.pkgs;
}
```
## Contributing ## Contributing
### Contributing guidelines ### Contributing guidelines