Describe the bug

The current version of Nix (2.33.0) is not compatible with git relative workspaces introduced in 2.48.0. This is likely due to libgit2 not supporting the extension.

I don't think there's much to do, other than waiting for libgit2 catching up with git stable versions, and recommend to avoid the feature. I just wanted to add the issue to warn anybody else stumbling into the issue, and how to revert to absolute worktrees as workaround.

Steps To Reproduce

Make sure you're using git version greater or equal than 2.48.0.

1. Create a git repo with a nix configuration

   nix flake new --template 'templates#bash-hello' test
   git -C test init && git -C test add . && git -C test commit -m "Initial commit"

2. Verify that's working as expected:

   git -C test config --local --list
   nix run ./test

3. Add a relative worktree:

   git -C test worktree add --relative-paths -b dev ../test.worktrees/dev

4. Now you get the error

   git -C test config --local --list
   nix run ./test

   The error should be something like

   error:
     … while fetching the input 'git+file:///.../test'
     error: opening Git repository "/.../test": unsupported extension name extensions.relativeworktrees
   

   Note the new line extensions.relativeworktrees=true in the local configuration.

Getting rid of relative worktree configuration will fix the problem:

git -C test.worktrees/dev worktree repair --no-relative-paths
git -C test config unset --local extensions.relativeworktrees
nix run ./test

Expected behavior

nix should work with features of the stable versions of git

Metadata

nix-env (Determinate Nix 3.15.1) 2.33.0

Additional context

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

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