source: trunk/debathena/debathena/kiosk/gdm-launch-kiosk @ 24213

#!/usr/bin/python -Wall

import gtk
import gtk.glade
import gobject
import time
import os
import sys
import subprocess
from optparse import OptionParser

gladeFile = "/usr/share/debathena-kiosk/gdm-launch-kiosk.glade"
launchCommand = "/usr/lib/debathena-kiosk/launch-kiosk"

class Kiosk:
    def __init__(self):
        try:
            self.xml = gtk.glade.XML(gladeFile)
        except:
            print "Failed to create Glade XML object."
            sys.exit(1)
        self.kioskWindow = self.xml.get_widget('KioskWindow')
        self.kioskDialog = self.xml.get_widget('KioskDialog')
        self.xml.signal_autoconnect(self)
        # Turn off all window decorations for the login screen.
        self.kioskWindow.set_decorated(False)
        self.kioskDialog.set_decorated(False)
        # Position the window near the bottom of the screen, in the center.
        self.kioskWindow.set_gravity(gtk.gdk.GRAVITY_SOUTH)
        width, height = self.kioskWindow.get_size()
        self.kioskWindow.move((gtk.gdk.screen_width() - width) / 2,
                              gtk.gdk.screen_height() - height - 80)
        self.kioskWindow.show_all()

    def kioskButton_on_click(self, button):
        self.kioskDialog.show()

    def kioskDialogResponseHandler(self, dialog, response_id):
        if response_id == 1:
            self.launch()
        self.kioskDialog.hide()

    def launch(self):
        pid = os.fork()
        if pid == 0:
            # Start a new session.
            os.setsid();
            # Fork another child to launch the command.
            pid = os.fork()
            if pid == 0:
                # Here in the second child, exec the command.
                try:
                    os.execlp("sudo", "sudo", "-n", launchCommand)
                except OSError, e:
                    print "error: Could not run %s as root: %s" % (launchCommand, e.strerror)
                    os._exit(255)
            else:
                # The first child exits immediately.
                os._exit(0)
        else:
            # Here in the parent: wait for the first child to exit.
            (pid, status) = os.waitpid(pid, 0)
            if status != 0:
                print "error launching command, status %d" % status


def main():
    if not os.access(gladeFile, os.R_OK):
        print 'error: Unable to read glade file "' + gladeFile + '"'
        sys.exit(1)
    Kiosk()
    gtk.main()

if __name__ == '__main__':
    main()