overrides: update build system for pyzmq 26.0.0 to scikit-build

[Samuel-Martineau]

Since about two months ago, pyzmq requires scikit-build to be built. This is a temporary workaround up until #568 is sorted out.

Contribution checklist (recommended but not always applicable/required):

• There's an automated test for this change
• Commit messages or code include references to related issues or PRs (including third parties)
• Commit messages are conventional - examples from the log include "feat: add changelog files to fixup hook", "fix(contourpy): allow wheel usage", and "test: add sqlalchemy2 test"

[multun]

@Samuel-Martineau I'm having the same issue, and had to make the following fixes:

• added scikit-build-core to pyzmq dependencies, which is not the same as scikit-build
• patched scikit-build-core to help it find meson and ninja

scikit-build-core = super.scikit-build-core.overridePythonAttrs (
  old: {
    preConfigure = ''
      sed -i '/def _get_cmake_path/i def _get_cmake_path(**_): yield Path("${pkgs.cmake}/bin/cmake")
           s/def _get_cmake_path/def _get_cmake_path_old/' src/scikit_build_core/program_search.py
      sed -i '/def _get_ninja_path/i def _get_ninja_path(**_): yield Path("${pkgs.ninja}/bin/ninja")
           s/def _get_ninja_path/def _get_ninja_path_old/' src/scikit_build_core/program_search.py
    '';
    propagatedBuildInputs = (old.propagatedBuildInputs or []) ++ [super.pyproject-metadata super.pathspec];
  }
);

Is your PR already in a working state? if so, what nixpkgs channel / pyzmq version did you test it with?

[Samuel-Martineau]

@multun If I am frankly honest, I don't recall how I tested this, all that I know is that I managed to get it running somehow. It is therefore quite likely that there are changes that I did that I forgot to include. I will try to test it again from scratch, though I suspect that your work is right and that those changes are indeed needed. If that's the case, would you mind me including your code in this PR?

[multun]

Oh yeah help yourself. Let me know if you need review / testing, so far I haven't tested anything.

[cpcloud]

Ok, I managed to get this working without too many hacks and was able to add a passing test.

[cpcloud]

Passing locally, merging!