It seems that `.git` is always stripped from the `git worktree list` output (including in `--porcelain` mode). This becomes relevant with bare repositories. Here is a bare repository functioning as expected:
$ mkdir bare1 $ cd bare1 $ git init --bare Initialized empty Git repository in /private/tmp/bare1/ $ git worktree list /private/tmp/bare1 (bare)
But if we create a bare repository in a directory named `.git`, `git worktree list` displays the parent directory as the worktree, even though `git status` doesn't recognize it as a worktree:
$ mkdir -p bare2/.git $ cd bare2/.git $ git init --bare Initialized empty Git repository in /private/tmp/bare2/.git/ $ git worktree list /private/tmp/bare2 (bare) $ cd /tmp/bare2 $ git status fatal: this operation must be run in a work tree
However, Git _will_ recognize the parent directory (/tmp/bare2) as a Git repository for the purposes of commands like `git rev-parse --git-dir`. I suspect this can be fixed in `get_main_worktree` by only stripping a `.git` suffix from the path if the main worktree is not bare.