Allow .git directory to be fully included in local path

[isd-project]

Hey 👋

Thank you soo much for improving the nix + Python ecosystem ❤️

I have a rather specific request and fully understand if it is currently outside the scope of the project.

In short, I would like to use a package that uses versioningit.
This build plugin uses the Git history to derive the package's version number during build time.

The current uv2nix tooling does not include the full git history, and I don't know where to extend the nix code to do so.

You can try and view the minimal reproducible example here:

• https://github.com/isd-project/minimal-versioningit-nix

In short, building it with uv build works as expected but running nix build .# does not, as it cannot read the entire .git directory to find the associated Git tag.

Thanks!

[adisbladis]

Most build systems that attempt to extract version metadata from git has a mode where you can fake version metadata using an environment variable.
Versioningit has an open issue for that: jwodder/versioningit#45.

In the mean time one workaround could be to create a git repo in the build and tag a version:

      pyprojectOverrides = final: prev: {
        minimal-versioningit = prev.minimal-versioningit.overrideAttrs(old: {
          nativeBuildInputs = old.nativeBuildInputs ++ [ pkgs.git ];
          preBuild = ''
            export HOME=$(mktemp -d)
            git init
            git config --global user.email "[email protected]"
            git config --global user.name "Your Name"
            git add *
            git commit -m 'fake'
            git tag "$version"
          '';
        });
      };

[isd-project]

I see. I thought that it should be possible to include the entire git history such that the version can be extracted during runtime in a "wrapping" derivation. But I see that there are quite a few issues with this approach.
Thank you for also providing a work around!