`cabalProject` has no way to specify a branch name

[parsonsmatt]

The branchMap configuration option was added to stackProject, but this was not ported to cabalProject.

[parsonsmatt]

Huh. The parser is converting tag in the cabal.project to ref. Presumably because tag can be either a git commit (aka rev) or a branch/tag (aka ref). This breaks the ability to use source-repo-override:

    source-repo-override = {
      "https://github.com/TeofilC/servant.git" =
        orig: orig // {
          ref = "ghc-9.4";
          rev = orig.rev;
        };
    };

since the fetchgit call does an override here:

              then fetchgit { inherit (repoData) url sha256; rev = repoData.ref; }

If the parser can disambiguate a ref and a rev, then we could set it appropriately from the outset.

  extractSourceRepoPackageData = cabalProjectFileName: sha256map: repo: {
    url = repo.location;
    ref = repo.tag;
    sha256 = repo."--sha256" or (
      if sha256map != null
        then sha256map."${repo.location}"."${repo.tag}"
        else null);
    subdirs = if repo ? subdir
      then pkgs.lib.filter (x: x != "") (pkgs.lib.splitString " " repo.subdir)
      else ["."];
  };

[fumieval]

Apparently this breaks the ability to specify cabalProject by an arbitrary string; I get the following error when I pass cabalProject = builtins.readFile "${args.src}/cabal.project"; to haskell-nix.cabalProject

trace: WARNING: No sha256 found for source-repository-package https://github.com/herp-inc/raven-haskell.git ref=(unspecified) rev=e9d89ecb3499c29f56a67da00bddbed53e37aeca download may fail in restricted mode (hydra)
error: fetchTree argument 'ref' is null while a string, Boolean or integer is expected

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.