core-agent-linux/misc/qubes-desktop-run

#!/usr/bin/python

from gi.repository import Gio
import sys
import dbus

def main(myname, desktop, *files):
    launcher = Gio.DesktopAppInfo.new_from_filename(desktop)
    activatable = launcher.get_boolean('DBusActivatable')
    if activatable:
        bus = dbus.SessionBus()
        service_id = launcher.get_id()
        # cut the .desktop suffix
        service_id = service_id[:-8]
        bus.start_service_by_name(service_id)
    launcher.launch(files, None)

if __name__ == "__main__":
    main(*sys.argv)