func newDbusWatcher(isSystemBus bool) (dw *dbusWatcher) {
	dw = &dbusWatcher{isSystemBus: isSystemBus}
	var err error
	if dw.isSystemBus {
		dw.dbusObj, err = dbus.SystemBus()
	} else {
		dw.dbusObj, err = dbus.SessionBus()
	}
	if err != nil {
		logger.Error(err)
		return
	}
	dw.start()
	return
}
func getNodeInfo(dest string, path dbus.ObjectPath) (*introspect.NodeInfo, error) {
	conn, err := dbus.SystemBus()
	if err != nil {
		return nil, err
	}

	var xmlString string
	dbusObj := conn.Object(dest, path)
	dbusObj.Call("org.freedesktop.DBus.Introspectable.Introspect",
		dbus.FlagNoAutoStart).Store(&xmlString)

	var node introspect.NodeInfo
	err = xml.Unmarshal([]byte(xmlString), &node)
	if err != nil {
		return nil, err
	}

	return &node, nil
}
func (dbusIfc *DBusInterfaceTest) SetUpSuite(c *C.C) {
	_, err := dbus.SystemBus()
	if err != nil {
		c.Skip(err.Error())
	}
}