commit 4300867b7bfc4f67a0e8b273aa7d2d13973ea7ac
Author: Vincent Untz <vuntz@gnome.org>
Date:   Mon Mar 12 15:31:40 2012 +0100

    datetime: Allow changing timezone without auth if action is allowed
    
    As changing the time can have security implications, while changing the
    timezone doesn't, it's not unusual to have a setup where
    org.freedesktop.timedate1.set-timezone is allowed while other
    time-related actions aren't.
    
    Therefore, if org.freedesktop.timedate1.set-timezone is allowed, there's
    no reason to require that the user unlocks the panel to enable him to
    change the timezone.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=646185

Index: gnome-control-center-3.7.3/panels/datetime/cc-datetime-panel.c
===================================================================
--- gnome-control-center-3.7.3.orig/panels/datetime/cc-datetime-panel.c
+++ gnome-control-center-3.7.3/panels/datetime/cc-datetime-panel.c
@@ -88,6 +88,7 @@ struct _CcDateTimePanelPrivate
   GCancellable *cancellable;
 
   GPermission *permission;
+  GPermission *permission_tz;
 };
 
 static void update_time (CcDateTimePanel *self);
@@ -166,6 +167,12 @@ cc_date_time_panel_dispose (GObject *obj
       priv->permission = NULL;
     }
 
+  if (priv->permission_tz)
+    {
+      g_object_unref (priv->permission_tz);
+      priv->permission_tz = NULL;
+    }
+
   G_OBJECT_CLASS (cc_date_time_panel_parent_class)->dispose (object);
 }
 
@@ -818,19 +825,33 @@ on_permission_changed (GPermission *perm
                        gpointer     data)
 {
   CcDateTimePanelPrivate *priv = CC_DATE_TIME_PANEL (data)->priv;
-  gboolean allowed, using_ntp;
+  gboolean allowed, allowed_tz, using_ntp;
 
   allowed = g_permission_get_allowed (permission);
+  allowed_tz = priv->permission_tz && g_permission_get_allowed (priv->permission_tz);
   using_ntp = gtk_switch_get_active (GTK_SWITCH (W("network_time_switch")));
 
   /* All the widgets but the lock button and the 24h setting */
-  gtk_widget_set_sensitive (W("map-vbox"), allowed);
+  gtk_widget_set_sensitive (W("map-vbox"), allowed || allowed_tz);
   gtk_widget_set_sensitive (W("hbox2"), allowed);
   gtk_widget_set_sensitive (W("alignment2"), allowed);
   update_widget_state_for_ntp (data, using_ntp);
 }
 
 static void
+on_permission_tz_changed (GPermission *permission,
+                          GParamSpec  *pspec,
+                          gpointer     data)
+{
+  CcDateTimePanelPrivate *priv = CC_DATE_TIME_PANEL (data)->priv;
+  gboolean allowed;
+
+  allowed = g_permission_get_allowed (permission) || g_permission_get_allowed (priv->permission);
+
+  gtk_widget_set_sensitive (W("map-vbox"), allowed);
+}
+
+static void
 update_ntp_switch_from_system (CcDateTimePanel *self)
 {
   CcDateTimePanelPrivate *priv = self->priv;
@@ -1134,4 +1155,16 @@ cc_date_time_panel_init (CcDateTimePanel
   g_signal_connect (priv->permission, "notify",
                     G_CALLBACK (on_permission_changed), self);
   on_permission_changed (priv->permission, NULL, self);
+
+  priv->permission_tz = polkit_permission_new_sync ("org.freedesktop.timedate1.set-timezone", NULL, NULL, NULL);
+  if (priv->permission_tz == NULL)
+    {
+      g_warning ("Your system does not have the '%s' PolicyKit files installed. Please check your installation",
+                 "org.freedesktop.timedate1.set-timezone");
+      return;
+    }
+
+  g_signal_connect (priv->permission_tz, "notify",
+                    G_CALLBACK (on_permission_tz_changed), self);
+  on_permission_tz_changed (priv->permission_tz, NULL, self);
 }