| 1 | #!/usr/bin/python |
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| 2 | # |
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| 3 | # An applet to monitor /etc/nologin |
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| 4 | |
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| 5 | import gio |
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| 6 | import dbus |
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| 7 | import dbus.mainloop.glib |
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| 8 | import gtk |
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| 9 | import gobject |
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| 10 | import sys |
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| 11 | import os |
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| 12 | |
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| 13 | SM_DBUS_NAME = "org.gnome.SessionManager" |
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| 14 | SM_DBUS_PATH = "/org/gnome/SessionManager" |
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| 15 | SM_DBUS_INTERFACE = "org.gnome.SessionManager" |
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| 16 | SM_CLIENT_DBUS_INTERFACE = "org.gnome.SessionManager.ClientPrivate" |
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| 17 | APP_ID = "debathena-nologin-monitor" |
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| 18 | |
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| 19 | class GDMSucks: |
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| 20 | def __init__(self): |
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| 21 | self.sessionEnding = False |
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| 22 | self.sessionBus = dbus.SessionBus() |
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| 23 | try: |
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| 24 | self.register_with_sm() |
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| 25 | self.init_sm_client() |
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| 26 | except: |
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| 27 | print "Warning: Cannot register with session manager." |
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| 28 | |
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| 29 | self.window = gtk.Window(gtk.WINDOW_TOPLEVEL) |
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| 30 | self.label = gtk.Label() |
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| 31 | self.label.set_markup('<span font_desc="Sans Bold 24">This workstation is temporarily unavailable. Please use another workstation.</span>') |
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| 32 | self.window.add(self.label) |
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| 33 | self.window.set_decorated(False) |
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| 34 | self.window.set_position(gtk.WIN_POS_CENTER) |
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| 35 | self.window.hide() |
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| 36 | self.gfile = gio.File("/etc/nologin") |
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| 37 | self.monitor = self.gfile.monitor_file(gio.FILE_MONITOR_NONE, None) |
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| 38 | self.monitor.connect("changed", self.directory_changed) |
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| 39 | |
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| 40 | def directory_changed(self, monitor, file1, file2, evt_type): |
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| 41 | # type(evt_type) is <class 'gio._gio.FileMonitorEvent'> |
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| 42 | # Value is something like: |
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| 43 | # <enum G_FILE_MONITOR_EVENT_CREATED of type GFileMonitorEvent> |
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| 44 | # However, those constants aren't available in Python, unless I'm missing something |
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| 45 | # So, we do this the stupid way: |
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| 46 | if str(evt_type) == "<enum G_FILE_MONITOR_EVENT_CREATED of type GFileMonitorEvent>": |
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| 47 | self.window.show_all() |
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| 48 | if str(evt_type) == "<enum G_FILE_MONITOR_EVENT_DELETED of type GFileMonitorEvent>": |
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| 49 | self.window.hide() |
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| 50 | |
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| 51 | # Connect to the session manager, and register our client. |
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| 52 | def register_with_sm(self): |
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| 53 | proxy = self.sessionBus.get_object(SM_DBUS_NAME, SM_DBUS_PATH) |
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| 54 | sm = dbus.Interface(proxy, SM_DBUS_INTERFACE) |
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| 55 | autostart_id = os.getenv("DESKTOP_AUTOSTART_ID", default="") |
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| 56 | self.smClientId = sm.RegisterClient(APP_ID, autostart_id) |
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| 57 | |
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| 58 | # Set up to handle signals from the session manager. |
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| 59 | def init_sm_client(self): |
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| 60 | proxy = self.sessionBus.get_object(SM_DBUS_NAME, self.smClientId) |
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| 61 | self.smClient = dbus.Interface(proxy, SM_CLIENT_DBUS_INTERFACE) |
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| 62 | self.smClient.connect_to_signal("QueryEndSession", |
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| 63 | self.sm_on_QueryEndSession) |
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| 64 | self.smClient.connect_to_signal("EndSession", self.sm_on_EndSession) |
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| 65 | self.smClient.connect_to_signal("CancelEndSession", |
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| 66 | self.sm_on_CancelEndSession) |
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| 67 | self.smClient.connect_to_signal("Stop", self.sm_on_Stop) |
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| 68 | |
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| 69 | # Here on a QueryEndSession signal from the session manager. |
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| 70 | def sm_on_QueryEndSession(self, flags): |
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| 71 | self.sessionEnding = True |
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| 72 | # Response args: is_ok, reason. |
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| 73 | self.smClient.EndSessionResponse(True, "") |
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| 74 | |
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| 75 | # Here on an EndSession signal from the session manager. |
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| 76 | def sm_on_EndSession(self, flags): |
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| 77 | self.sessionEnding = True |
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| 78 | # Response args: is_ok, reason. |
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| 79 | self.smClient.EndSessionResponse(True, "") |
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| 80 | |
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| 81 | # Here on a CancelEndSession signal from the session manager. |
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| 82 | def sm_on_CancelEndSession(self): |
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| 83 | self.sessionEnding = False |
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| 84 | |
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| 85 | # Here on a Stop signal from the session manager. |
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| 86 | def sm_on_Stop(self): |
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| 87 | gtk.main_quit() |
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| 88 | |
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| 89 | def main(): |
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| 90 | dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) |
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| 91 | GDMSucks() |
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| 92 | gtk.main() |
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| 93 | |
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| 94 | if __name__ == '__main__': |
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| 95 | main() |
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