[glib] GApplication: don't fail if can't get session bus

[Ryan Lortie <ryanl src gnome org>]

commit 345688c9e9d811b2844ea573c82be63cb02996ce
Author: Ryan Lortie <desrt desrt ca>
Date:   Tue Nov 22 17:32:04 2011 -0500

    GApplication: don't fail if can't get session bus
    
    If we can't get on the session bus, just behave like a normal non-unique
    application.
    
    This turns out to be remarkably easy to implement and lets us avoid
    adding a 'dummy' backend.
    
    Add a test for this case as well.
    
    Idea from Zachary Dovel.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=651997

 gio/gapplicationimpl-dbus.c |   15 +++++++++------
 gio/tests/gapplication.c    |   37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 6 deletions(-)
---
diff --git a/gio/gapplicationimpl-dbus.c b/gio/gapplicationimpl-dbus.c
index 3fae844..8a19b0d 100644
--- a/gio/gapplicationimpl-dbus.c
+++ b/gio/gapplicationimpl-dbus.c
@@ -584,18 +584,20 @@ g_application_impl_register (GApplication       *application,
   GVariant *reply;
   guint32 rval;
 
-  impl = g_slice_new (GApplicationImpl);
+  impl = g_slice_new0 (GApplicationImpl);
 
   impl->app = application;
   impl->bus_name = appid;
 
-  impl->session_bus = g_bus_get_sync (G_BUS_TYPE_SESSION,
-                                      cancellable, error);
+  impl->session_bus = g_bus_get_sync (G_BUS_TYPE_SESSION, cancellable, NULL);
 
   if (impl->session_bus == NULL)
     {
-      g_slice_free (GApplicationImpl, impl);
-      return NULL;
+      /* If we can't connect to the session bus, proceed as a normal
+       * non-unique application.
+       */
+      *remote_actions = NULL;
+      return impl;
     }
 
   impl->object_path = application_path_from_appid (appid);
@@ -952,7 +954,8 @@ g_application_impl_activate_action (GApplicationImpl *impl,
 void
 g_application_impl_flush (GApplicationImpl *impl)
 {
-  g_dbus_connection_flush_sync (impl->session_bus, NULL, NULL);
+  if (impl->session_bus)
+    g_dbus_connection_flush_sync (impl->session_bus, NULL, NULL);
 }
 
 
diff --git a/gio/tests/gapplication.c b/gio/tests/gapplication.c
index 20a511c..715e5f5 100644
--- a/gio/tests/gapplication.c
+++ b/gio/tests/gapplication.c
@@ -247,6 +247,42 @@ appid (void)
   g_assert (g_application_id_is_valid ("org.gnome.SessionManager"));
 }
 
+static gboolean nodbus_activated;
+
+static gboolean
+release_app (gpointer user_data)
+{
+  g_application_release (user_data);
+  return FALSE;
+}
+
+static void
+nodbus_activate (GApplication *app)
+{
+  nodbus_activated = TRUE;
+  g_application_hold (app);
+  g_idle_add (release_app, app);
+}
+
+static void
+test_nodbus (void)
+{
+  gchar *argv[] = { "./unimportant", NULL };
+  GDBusConnection *session;
+  GApplication *app;
+
+  session = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL);
+  g_assert (session == NULL);
+
+  app = g_application_new ("org.gtk.Unimportant",
+                           G_APPLICATION_FLAGS_NONE);
+  g_signal_connect (app, "activate", G_CALLBACK (nodbus_activate), NULL);
+  g_application_run (app, 1, argv);
+  g_object_unref (app);
+
+  g_assert (nodbus_activated);
+}
+
 int
 main (int argc, char **argv)
 {
@@ -261,6 +297,7 @@ main (int argc, char **argv)
   g_unsetenv ("DISPLAY");
   g_setenv ("DBUS_SESSION_BUS_ADDRESS", session_bus_get_temporary_address (), TRUE);
 
+  g_test_add_func ("/gapplication/no-dbus", test_nodbus);
   g_test_add_func ("/gapplication/basic", basic);
   g_test_add_func ("/gapplication/non-unique", test_nonunique);
   g_test_add_func ("/gapplication/properties", properties);