code: def relative_readlink(self, relpath):
      
      if self.isignored(self._append_slash_if_dir_path(relpath)):
        self._raise_access_ignored(relpath)
      return self._relative_readlink_raw(relpath)
docs: Execute `readlink` for the given path, which may result in a relative path.
  
      Raises exception if path is ignored.