Claim DBus names (Shell, Notifictions) *very* early

See commit f2158218bef0c51 in mutter.  Basically, we need
to grab org.freedesktop.Notifications before anything else
in the session gets started.

Note: I intentionally removed the Util.killall bits.  I believe that
for notification-daemon at least, if we specify
DBUS_NAME_FLAG_REPLACE_EXISTING, we'll take over the name.  Not sure
about notify-osd; if that's still a problem, then what we need to do
is add killing (and possibly respawning) of notify-osd to
"gnome-shell --replace", and not have it embedded randomly in a JS file.

https://bugzilla.gnome.org/show_bug.cgi?id=642666

js/ui/main.js

@@ -88,7 +88,6 @@ function start() {
 
     Gio.DesktopAppInfo.set_desktop_env('GNOME');
 
-    global.grab_dbus_service();
     shellDBusService = new ShellDBus.GnomeShell();
     // Force a connection now; dbus.js will do this internally
     // if we use its name acquisition stuff but we aren't right

js/ui/notificationDaemon.js

@@ -93,16 +93,6 @@ NotificationDaemon.prototype = {
     _init: function() {
         DBus.session.exportObject('/org/freedesktop/Notifications', this);
 
-        this._everAcquiredName = false;
-        DBus.session.acquire_name('org.freedesktop.Notifications',
-                                  // We pass MANY_INSTANCES so that if
-                                  // notification-daemon is running, we'll
-                                  // get queued behind it and then get the
-                                  // name after killing it below
-                                  DBus.MANY_INSTANCES,
-                                  Lang.bind(this, this._acquiredName),
-                                  Lang.bind(this, this._lostName));
-
         this._sources = {};
         this._senderToPid = {};
         this._notifications = {};
@@ -117,22 +107,6 @@ NotificationDaemon.prototype = {
             Lang.bind(this, this._onFocusAppChanged));
     },
 
-    _acquiredName: function() {
-        this._everAcquiredName = true;
-    },
-
-    _lostName: function() {
-        if (this._everAcquiredName)
-            log('Lost name org.freedesktop.Notifications!');
-        else if (GLib.getenv('GNOME_SHELL_NO_REPLACE'))
-            log('Failed to acquire org.freedesktop.Notifications');
-        else {
-            log('Failed to acquire org.freedesktop.Notifications; trying again');
-            Util.killall('notification-daemon');
-            Util.killall('notify-osd');
-        }
-    },
-
     _iconForNotificationData: function(icon, hints, size) {
         let textureCache = St.TextureCache.get_default();
 

src/gnome-shell-plugin.c

@@ -54,9 +54,13 @@
 #include "st.h"
 #include "shell-a11y.h"
 
+#define SHELL_DBUS_SERVICE "org.gnome.Shell"
+#define MAGNIFIER_DBUS_SERVICE "org.gnome.Magnifier"
+
 static void gnome_shell_plugin_dispose     (GObject *object);
 static void gnome_shell_plugin_finalize    (GObject *object);
 
+static void gnome_shell_plugin_early_initialize (MetaPlugin          *plugin);
 static void gnome_shell_plugin_start            (MetaPlugin          *plugin);
 static void gnome_shell_plugin_minimize         (MetaPlugin          *plugin,
                                                  MetaWindowActor     *actor);
@@ -138,6 +142,7 @@ gnome_shell_plugin_class_init (GnomeShellPluginClass *klass)
   gobject_class->dispose         = gnome_shell_plugin_dispose;
   gobject_class->finalize        = gnome_shell_plugin_finalize;
 
+  plugin_class->early_initialize = gnome_shell_plugin_early_initialize;
   plugin_class->start            = gnome_shell_plugin_start;
   plugin_class->map              = gnome_shell_plugin_map;
   plugin_class->minimize         = gnome_shell_plugin_minimize;
@@ -403,6 +408,84 @@ muted_log_handler (const char     *log_domain,
   /* Intentionally empty to discard message */
 }
 
+static void
+gnome_shell_plugin_early_initialize (MetaPlugin *plugin)
+{
+  GError *error = NULL;
+  DBusGConnection *session;
+  DBusGProxy *bus;
+  guint32 request_name_result;
+
+  /** TODO:
+   * In the future we should use GDBus for this.  However, in
+   * order to do that, we need to port all of the JavaScript
+   * code.  Otherwise, the name will be claimed on the wrong
+   * connection.
+   */
+  session = dbus_g_bus_get (DBUS_BUS_SESSION, NULL);
+
+  bus = dbus_g_proxy_new_for_name (session,
+                                   DBUS_SERVICE_DBUS,
+                                   DBUS_PATH_DBUS,
+                                   DBUS_INTERFACE_DBUS);
+
+  if (!dbus_g_proxy_call (bus, "RequestName", &error,
+                          G_TYPE_STRING, SHELL_DBUS_SERVICE,
+                          G_TYPE_UINT, 0,
+                          G_TYPE_INVALID,
+                          G_TYPE_UINT, &request_name_result,
+                          G_TYPE_INVALID))
+    {
+      g_print ("failed to acquire org.gnome.Shell: %s\n", error->message);
+      /* If we somehow got started again, it's not an error to be running
+       * already.  So just exit 0.
+       */
+      exit (0);
+    }
+
+  /* Also grab org.gnome.Panel to replace any existing panel process,
+   * unless a special environment variable is passed.  The environment
+   * variable is used by the gnome-shell (no --replace) launcher in
+   * Xephyr */
+  if (!dbus_g_proxy_call (bus, "RequestName", &error, G_TYPE_STRING,
+                          "org.gnome.Panel", G_TYPE_UINT,
+                          DBUS_NAME_FLAG_REPLACE_EXISTING | DBUS_NAME_FLAG_DO_NOT_QUEUE,
+                          G_TYPE_INVALID, G_TYPE_UINT,
+                          &request_name_result, G_TYPE_INVALID))
+    {
+      g_print ("failed to acquire org.gnome.Panel: %s\n", error->message);
+      exit (1);
+    }
+
+  /* ...and the org.gnome.Magnifier service.
+   */
+  if (!dbus_g_proxy_call (bus, "RequestName", &error,
+                          G_TYPE_STRING, MAGNIFIER_DBUS_SERVICE,
+                          G_TYPE_UINT, 0,
+                          G_TYPE_INVALID,
+                          G_TYPE_UINT, &request_name_result,
+                          G_TYPE_INVALID))
+    {
+      g_print ("failed to acquire %s: %s\n", MAGNIFIER_DBUS_SERVICE, error->message);
+      /* Failing to acquire the magnifer service is not fatal.  Log the error,
+       * but keep going. */
+    }
+
+  /* ...and the org.freedesktop.Notifications service.
+   */
+  if (!dbus_g_proxy_call (bus, "RequestName", &error,
+                          G_TYPE_STRING, "org.freedesktop.Notifications",
+                          G_TYPE_UINT, DBUS_NAME_FLAG_REPLACE_EXISTING | DBUS_NAME_FLAG_DO_NOT_QUEUE,
+                          G_TYPE_INVALID,
+                          G_TYPE_UINT, &request_name_result,
+                          G_TYPE_INVALID))
+    {
+      g_print ("failed to acquire org.freedesktop.Notifications: %s\n", error->message);
+    }
+
+  g_object_unref (bus);
+}
+
 static void
 gnome_shell_plugin_start (MetaPlugin *plugin)
 {

src/shell-global.c

@@ -35,9 +35,6 @@
 #endif
 #include "shell-jsapi-compat-private.h"
 
-#define SHELL_DBUS_SERVICE "org.gnome.Shell"
-#define MAGNIFIER_DBUS_SERVICE "org.gnome.Magnifier"
-
 static void grab_notify (GtkWidget *widget, gboolean is_grab, gpointer user_data);
 
 struct _ShellGlobal {
@@ -1231,68 +1228,6 @@ shell_global_maybe_gc (ShellGlobal *global)
   gjs_context_maybe_gc (global->js_context);
 }
 
-void
-shell_global_grab_dbus_service (ShellGlobal *global)
-{
-  GError *error = NULL;
-  DBusGConnection *session;
-  DBusGProxy *bus;
-  guint32 request_name_result;
-  
-  session = dbus_g_bus_get (DBUS_BUS_SESSION, NULL);
-  
-  bus = dbus_g_proxy_new_for_name (session,
-                                   DBUS_SERVICE_DBUS,
-                                   DBUS_PATH_DBUS,
-                                   DBUS_INTERFACE_DBUS);
-  
-  if (!dbus_g_proxy_call (bus, "RequestName", &error,
-                          G_TYPE_STRING, SHELL_DBUS_SERVICE,
-                          G_TYPE_UINT, 0,
-                          G_TYPE_INVALID,
-                          G_TYPE_UINT, &request_name_result,
-                          G_TYPE_INVALID)) 
-    {
-      g_print ("failed to acquire org.gnome.Shell: %s\n", error->message);
-      /* If we somehow got started again, it's not an error to be running
-       * already.  So just exit 0.
-       */
-      exit (0);  
-    }
-
-  /* Also grab org.gnome.Panel to replace any existing panel process,
-   * unless a special environment variable is passed.  The environment
-   * variable is used by the gnome-shell (no --replace) launcher in
-   * Xephyr */
-  if (!g_getenv ("GNOME_SHELL_NO_REPLACE"))
-    {
-      if (!dbus_g_proxy_call (bus, "RequestName", &error, G_TYPE_STRING,
-                              "org.gnome.Panel", G_TYPE_UINT,
-                              DBUS_NAME_FLAG_REPLACE_EXISTING | DBUS_NAME_FLAG_DO_NOT_QUEUE,
-                              G_TYPE_INVALID, G_TYPE_UINT,
-                              &request_name_result, G_TYPE_INVALID))
-        {
-          g_print ("failed to acquire org.gnome.Panel: %s\n", error->message);
-          exit (1);
-        }
-    }
-
-  /* ...and the org.gnome.Magnifier service.
-   */
-  if (!dbus_g_proxy_call (bus, "RequestName", &error,
-                          G_TYPE_STRING, MAGNIFIER_DBUS_SERVICE,
-                          G_TYPE_UINT, 0,
-                          G_TYPE_INVALID,
-                          G_TYPE_UINT, &request_name_result,
-                          G_TYPE_INVALID))
-    {
-      g_print ("failed to acquire %s: %s\n", MAGNIFIER_DBUS_SERVICE, error->message);
-      /* Failing to acquire the magnifer service is not fatal.  Log the error,
-       * but keep going. */
-    }
-  g_object_unref (bus);
-}
-
 static void
 grab_notify (GtkWidget *widget, gboolean was_grabbed, gpointer user_data)
 {

src/shell-global.h

@@ -59,8 +59,6 @@ gboolean shell_global_add_extension_importer (ShellGlobal *global,
                                               const char  *directory,
                                               GError     **error);
 
-void shell_global_grab_dbus_service (ShellGlobal *global);
-
 typedef enum {
   SHELL_STAGE_INPUT_MODE_NONREACTIVE,
   SHELL_STAGE_INPUT_MODE_NORMAL,