:return:

def clean_up(self):
        """
        :return:
        """
        if self.auth_type == 'registry_rubber' and self.user:
            self._registry_rubber_uonce('delete')

        # clean up old docker configs.
        user_home = os.environ.get('HOME')
        for file_name in os.listdir(user_home):
            if 'dockercfg' in file_name:
                if file_name.count('.') is 2:
                    try:
                        parts = file_name.split('.')
                        delta = int(time.time()) - int(parts[1])

                        # default to 30 seconds?
                        if delta > 30:
                            os.remove(os.path.realpath(os.path.join(user_home, file_name)))
                    except Exception:
                        pass