Ticket #505: debathena-branding

#!/usr/bin/python -Wall

import dbus
import dbus.mainloop.glib
import gtk
import gobject
#import time
import os
#import sys
import subprocess
#from optparse import OptionParser

SM_DBUS_NAME = "org.gnome.SessionManager"
SM_DBUS_PATH = "/org/gnome/SessionManager"
SM_DBUS_INTERFACE = "org.gnome.SessionManager"
SM_CLIENT_DBUS_INTERFACE = "org.gnome.SessionManager.ClientPrivate"
APP_ID = "debathena-branding"

class Branding:
    def __init__(self):
        self.sessionEnding = False
        self.sessionBus = dbus.SessionBus()
        try:
            self.register_with_sm()
            self.init_sm_client()
        except:
            print "Warning: Cannot register with session manager."

        self.brandingWindow = gtk.Window(gtk.WINDOW_TOPLEVEL)
        self.brandingLabel = gtk.Label()
        self.brandingLabel.set_justify(gtk.JUSTIFY_CENTER)
        self.brandingLabel.set_padding(2,2)
        self.brandingWindow.add(self.brandingLabel)
        # Turn off all window decorations for the login screen.
        self.brandingWindow.set_decorated(False)
        try:
            metapackage = subprocess.Popen(["machtype", "-L"], stdout=subprocess.PIPE).communicate()[0].rstrip()
        except OSError:
            metapackage = '(error)'
        try:
            baseos = subprocess.Popen(["machtype", "-E"], stdout=subprocess.PIPE).communicate()[0].rstrip()
        except OSError:
            baseos = '(error)'
        self.brandingLabel.set_text(metapackage + "\n" + baseos)
        self.brandingWindow.set_gravity(gtk.gdk.GRAVITY_SOUTH_EAST)
        self.brandingWindow.set_size_request(self.brandingLabel.get_property('width-chars'),-1)
        width, height = self.brandingWindow.get_size()
        self.brandingWindow.move(gtk.gdk.screen_width(),
                              gtk.gdk.screen_height())
        self.brandingWindow.show_all()

    # Connect to the session manager, and register our client.
    def register_with_sm(self):
        proxy = self.sessionBus.get_object(SM_DBUS_NAME, SM_DBUS_PATH)
        sm = dbus.Interface(proxy, SM_DBUS_INTERFACE)
        autostart_id = os.getenv("DESKTOP_AUTOSTART_ID", default="")
        self.smClientId = sm.RegisterClient(APP_ID, autostart_id)

    # Set up to handle signals from the session manager.
    def init_sm_client(self):
        proxy = self.sessionBus.get_object(SM_DBUS_NAME, self.smClientId)
        self.smClient = dbus.Interface(proxy, SM_CLIENT_DBUS_INTERFACE)
        self.smClient.connect_to_signal("QueryEndSession",
                                         self.sm_on_QueryEndSession)
        self.smClient.connect_to_signal("EndSession", self.sm_on_EndSession)
        self.smClient.connect_to_signal("CancelEndSession",
                                         self.sm_on_CancelEndSession)
        self.smClient.connect_to_signal("Stop", self.sm_on_Stop)

    # Here on a QueryEndSession signal from the session manager.
    def sm_on_QueryEndSession(self, flags):
        self.sessionEnding = True
        # Response args: is_ok, reason.
        self.smClient.EndSessionResponse(True, "")

    # Here on an EndSession signal from the session manager.
    def sm_on_EndSession(self, flags):
        self.sessionEnding = True
        # Response args: is_ok, reason.
        self.smClient.EndSessionResponse(True, "")

    # Here on a CancelEndSession signal from the session manager.
    def sm_on_CancelEndSession(self):
        self.sessionEnding = False

    # Here on a Stop signal from the session manager.
    def sm_on_Stop(self):
        gtk.main_quit()

def main():
    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
    Branding()
    gtk.main()

if __name__ == '__main__':
    main()