def getCliInstance():
	global _dbcli
	if not _dbcli:
		_dbcli = DatabaseHelper()
	return _dbcli
def update_snapshot(self, snapshot_id, **kwargs):
        """Updates a snapshot."""
        put_body = json.dumps({'snapshot': kwargs})
        resp, body = self.put('snapshots/%s' % snapshot_id, put_body)
        body = json.loads(body)
        return resp, body['snapshot']