def gzip_files(self):
        """Return a list of the files compressed by this link.

        This returns all files that were explicitly marked for compression.
        """
        ret_list = []
        for key, val in self.file_dict.items():
            # For temp files we only want files that were marked for removal
            if val & FileFlags.gz_mask:
                ret_list.append(key)
        return ret_list
Return a list of the files compressed by this link.

        This returns all files that were explicitly marked for compression.