Check if a file in this repository exists.

def path_ok(match_tuple: MatchTuple) -> bool:
    """Check if a file in this repository exists."""
    relative_path = match_tuple.link.split("#")[0]
    full_path = os.path.join(os.path.dirname(str(match_tuple.source)), relative_path)
    return os.path.exists(full_path)