Handle the case where there is not an hardware manager service installed.

shell/hardwaremanager.py

@@ -1,43 +0,0 @@
-# Copyright (C) 2006, Red Hat, Inc.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-
-import dbus
-
-HARDWARE_MANAGER_INTERFACE = 'org.laptop.HardwareManager'
-HARDWARE_MANAGER_SERVICE = 'org.laptop.HardwareManager'
-HARDWARE_MANAGER_OBJECT_PATH = '/org/laptop/HardwareManager'
-
-class HardwareManager(object):
-    COLOR_MODE = 0
-    B_AND_W_MODE = 1
-
-    def __init__(self):
-        bus = dbus.SystemBus()
-        proxy = bus.get_object(HARDWARE_MANAGER_SERVICE,
-                               HARDWARE_MANAGER_OBJECT_PATH)
-        self._service = dbus.Interface(proxy, HARDWARE_MANAGER_INTERFACE)
-
-    def set_display_mode(self, mode):
-        self._service.set_display_mode(mode)
-
-    def set_display_brightness(self, level):
-        self._service.set_display_brightness(level)
-
-    def toggle_keyboard_brightness(self):
-        if self._service.get_keyboard_brightness():
-            self._service.set_keyboard_brightness(False)
-        else:
-            self._service.set_keyboard_brightness(True)            

shell/view/hardwaremanager.py

@@ -14,6 +14,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
+import logging
+
 import dbus
 
 HARDWARE_MANAGER_INTERFACE = 'org.laptop.HardwareManager'
@@ -25,18 +27,31 @@ class HardwareManager(object):
     B_AND_W_MODE = 1
 
     def __init__(self):
-        bus = dbus.SystemBus()
-        proxy = bus.get_object(HARDWARE_MANAGER_SERVICE,
-                               HARDWARE_MANAGER_OBJECT_PATH)
-        self._service = dbus.Interface(proxy, HARDWARE_MANAGER_INTERFACE)
+        try:
+            bus = dbus.SystemBus()
+            proxy = bus.get_object(HARDWARE_MANAGER_SERVICE,
+                                   HARDWARE_MANAGER_OBJECT_PATH)
+            self._service = dbus.Interface(proxy, HARDWARE_MANAGER_INTERFACE)
+        except dbus.DBusException:
+            self._service = None
+            logging.error('Hardware manager service not found.')
 
     def set_display_mode(self, mode):
+        if not self._service:
+            logging.error('Cannot set display mode. Service not found.')
+
         self._service.set_mode(mode)
 
     def set_display_brightness(self, level):
+        if not self._service:
+            logging.error('Cannot set display brightness. Service not found.')
+
         self._service.set_display_brightness(level)
 
     def toggle_keyboard_brightness(self):
+        if not self._service:
+            logging.error('Cannot set keyboard brightness. Service not found.')
+
         if self._service.get_keyboard_brightness():
             self._service.set_keyboard_brightness(False)
         else: