commit 7116da8018e9015220c19fc8e3702f02834c6aeb · pyrox.dev/nixpkgs

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doc/languages-frameworks/python.md
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       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`). 

     

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       ### How to override a Python package using overlays?

     

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       To alter a python package using overlays, you would use the following approach:

     

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       ```nix

     

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       self: super:

     

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       rec {

     

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         python = super.python.override {

     

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           packageOverrides = python-self: python-super: {

     

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             bepasty-server = python-super.bepasty-server.overrideAttrs ( oldAttrs: {

     

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               src = self.pkgs.fetchgit {

     

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                 url = "https://github.com/bepasty/bepasty-server";

     

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                 sha256 = "9ziqshmsf0rjvdhhca55sm0x8jz76fsf2q4rwh4m6lpcf8wr0nps";

     

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                 rev = "e2516e8cf4f2afb5185337073607eb9e84a61d2d";

     

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               };

     

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             });

     

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           };

     

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         };

     

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         pythonPackages = python.pkgs;

     

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       }

     

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       ```

     

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       ## Contributing

     

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       ### Contributing guidelines