def _process_files(self, tar):
<EOL>for file_item in self.config.get('<STR_LIT>', []):<EOL><INDENT>path = file_item['<STR_LIT:path>']<EOL>if path.startswith('<STR_LIT:/>'):<EOL><INDENT>path = path[<NUM_LIT:1>:]<EOL><DEDENT>self._add_file(tar=tar,<EOL>name=path,<EOL>contents=file_item['<STR_LIT>'],<EOL>mode=file_item.get('<STR_LIT>', DEFAULT_FILE_MODE))<EOL><DEDENT>
Adds files specified in self.config['files'] to tarfile instance.

:param tar: tarfile instance
:returns: None