Function git_worktree_root

src/worktree.rs:41–53

Absolute, symlink-resolved toplevel of the git working tree that `dir` belongs to, or `None` when `dir` isn't inside a git repo (or `git` is missing on PATH). `git rev-parse --show-toplevel` returns the per-worktree root: the main checkout and each linked worktree report their own distinct directory, which is exactly the distinction this module relies on.

(dir: &Path)

/// checkout and each linked worktree report their own distinct directory,
/// which is exactly the distinction this module relies on.
pub fn git_worktree_root(dir: &Path) -> Option<PathBuf> {
    // gix discovery walks up the same way `git rev-parse` does but without
    // a subprocess spawn. A discovered bare repo (no workdir) matches
    // `--show-toplevel` failing.
    if let Ok(repo) = gix::discover(dir) {
        return realpath(repo.workdir()?);
    }
    if !git_may_resolve_repo(dir) {
        return None;
    }
    let trimmed = git_output(dir, &["rev-parse", "--show-toplevel"])?;
    realpath(Path::new(&trimmed))
}

/// Absolute, symlink-resolved path to the repository's git common directory.
///