5 * Check if a per-worktree symref points to a ref in the main worktree
6 * or any linked worktree, and return the path to the exising worktree
7 * if it is. Returns NULL if there is no existing ref. The caller is
8 * responsible for freeing the returned path.
10 extern char *find_shared_symref(const char *symref
, const char *target
);