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lib: add makeOverridableWithName + build*Package overrides #87394

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B4dM4n commented May 9, 2020

Motivation for this change

Improve the extensibility of language specific package builders.

Some of current build*Package functions support more overriding capabilities than others:

  • buildPythonPackage supports overriding packages via makeOverridable and overridePythonAttrs
  • buildLuarocksPackage and buildRubyGem support overriding packages via makeOverridable
  • buildRustPackage and buildPerlPackage supports no overriding

In theory makeOverridable should be enough to make a builder function overridable, but in practice this doesn't always work, because another callPackage might shadow the wanted override function.

buildPythonPackage works around this by providing a overridePythonAttrs function which is essentially a override with a custom name.

Things done

This PR adds a lib.makeOverridableWithName function, which is just lib.makeOverridable with a additional named override function.

It also adjusts the build*Package functions that I'm familiar with to use the new helper.

  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits
B4dM4n added 6 commits Apr 28, 2020
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FRidh commented May 9, 2020

Good initiative! But.... Do we actually need another override option? Maybe we should just ensure the custom builders use .overrideAttrs?

I still need to extend this, but please have a look at the RFC regarding this topic NixOS/rfcs#67. Please also have a look at the links in the PR which may give more context.

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