Thegit.Repo() constructor in GitPython fails to correctly initialize a repository when called without a path from within a Gitworktree and theGIT_DIR environment variable is set to that worktree. This variable is often automatically set by Git when executing an alias to point to the current repo or worktree git_dir. WhileRepo(os.getcwd()) finds the worktree correctly, callingRepo() withGIT_DIR set toRepo(os.getcwd()).git_dir raises anInvalidGitRepositoryError.

Minimal Reproducing Example:

1. Set up a main Git repository:

   mkdir main_repocd main_repogit inittouch initial_file.txtgit add initial_file.txtgit commit -m"Initial commit"

2. Create a Git worktree:

   git worktree add worktree_acd worktree_a

3. Create a simple Python script (e.g.,test_repo.py) to initialize a Repo object:

importosfromgitimportRepo,InvalidGitRepositoryErrorprint(f"Current working directory:{os.getcwd()}")print(f"GIT_DIR environment variable:{os.getenv('GIT_DIR')}")try:repo=Repo()print(f"Repo initialized successfully:{repo.working_dir}")exceptInvalidGitRepositoryErrorase:print(f"Error initializing Repo():{e}")try:repo_with_cwd=Repo(os.getcwd())print(f"Repo initialized with cwd successfully:{repo_with_cwd.working_dir}")print(f"Repo(os.getcwd()).git_dir:{Repo(os.getcwd()).git_dir}")exceptInvalidGitRepositoryErrorase:print(f"Error initializing Repo(os.getcwd()):{e}")

4. Create a Git alias to run the Python script (e.g., in.git/config or usinggit config --local alias.test-repo '!python /path/to/test_repo.py'):

   Replace/path/to/test_repo.py with the actual path to your script.

5. Run the Git alias from within the worktree:

   git test-repo

Expected Behavior:

Repo() should successfully initialize the repository, recognizing the worktree's context and linking back to the main repository's.git directory.

Observed Behavior:

Raises anInvalidGitRepositoryError whenRepo() is called without a path, whileRepo(os.getcwd()) succeeds. The output will also show that theGIT_DIR environment variable is set within the worktree's context.

Additional Information:

• GitPython Version: 3.1.44
• Python Version: 3.10.14
• Operating System: Linux

Maybe one should also check if such happens for submodules since they also have the repo dir in a different place than the normal .git dir.

Workaround:

Explicitly passingos.getcwd() to theRepo() constructor or unsetting theGIT_DIR environment variable before callingRepo() seems to work.