Support cargoPatches?

[tv42]

rustPlatform.buildRustPackage supports a cargoPatches option, that can be used to insert a Cargo.lock into upstream tarballs that don't contain it. It would be nice if the same was possible with naersk.

Alternatively, and more generically, this could be solved with a applyPatches { src; patches = []; } derivation -- but I'm not aware of such existing. I guess I'm writing that myself, next...

[tv42]

For anyone else stumbling on this, here's the generic patch apply trick:

  src = pkgs.stdenv.mkDerivation {
    name = "foo";
    src = origSrc;
    patches = [
      ./foo-cargo-lock.diff
    ];
    dontConfigure = true;
    dontBuild = true;
    doCheck = false;
    installPhase = ''
      cp -r . $out
    '';
  };

[paulyoung]

@tv42 does this approach allow patching or otherwise modifying a crate that exists as a dependency in Cargo.toml?

If so, please could you help me understand how to do that?

[tv42]

@paulyoung This method seems to be for patching the source being built itself. To patch dependencies, you'd need to e.g. change the Cargo.toml lines to point to something else, or something like that -- I don't know if naersk has any mechanism for replacing dependencies.