Overlays: Difference between revisions

Overlays (view source)

Revision as of 15:02, 21 April 2020

1,277 bytes added , 21 April 2020

Add python package override

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imported>Mickours

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 * [https://nixos.org/nixpkgs/manual/#chap-overlays Overlays  in nixpkgs manual]
 * [https://blog.flyingcircus.io/2017/11/07/nixos-the-dos-and-donts-of-nixpkgs-overlays/ Blog post "The DOs and DON’Ts of nixpkgs overlays"]
+== Python Packages Overlay ==
+Here is an example of Python packages overlay. The trick is to also override python itself with `packageOverrides`.
+Github issue with the snippet below: [[https://github.com/NixOS/nixpkgs/issues/26487#issuecomment-307363295]]
+<syntaxhighlight lang="nix">
+self: super:
+# Within the overlay we use a recursive set, though I think we can use `self` as well.
+rec {
+  # nix-shell -p python.pkgs.my_stuff
+  python = super.python.override {
+    # Careful, we're using a different self and super here!
+    packageOverrides = self: super: {
+      my_stuff = super.buildPythonPackage rec {
+        pname = "pyaes";
+        version = "1.6.0";
+        name = "${pname}-${version}";
+        src = super.fetchPypi {
+          inherit pname version;
+          sha256 = "0bp9bjqy1n6ij1zb86wz9lqa1dhla8qr1d7w2kxyn7jbj56sbmcw";
+        };
+      };
+    };
+  };
+  # nix-shell -p pythonPackages.my_stuff
+  pythonPackages = python.pkgs;
+  # nix-shell -p my_stuff
+  my_stuff = pythonPackages.buildPythonPackage rec {
+    pname = "pyaes";
+    version = "1.6.0";
+    name = "${pname}-${version}";
+    src = pythonPackages.fetchPypi {
+      inherit pname version;
+      sha256 = "0bp9bjqy1n6ij1zb86wz9lqa1dhla8qr1d7w2kxyn7jbj56sbmcw";
+    };
+  };
+}
+</syntaxhighlight>
 === References ===