main, util: Notify systemd once we are fully initialised

If graphical applications want to start from systemd units, they need to
start after we're properly ready to display them. This is particularly
important under X where `_GTK_FRAME_EXTENTS` and other xprops are needed
to have the right theming.

We're doing this in an idle callback so that the dynamic starting of
`gnome-session-x11-service.target` (which launches `gsd-xsettings`) as
the result of a signal emission happens before us signalling we're ready
for later things to start.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/750

js/ui/main.js

@@ -229,7 +229,11 @@ function _initializeUI() {
     EndSessionDialog.init();
 
     // We're ready for the session manager to move to the next phase
-    Meta.register_with_session();
+    GLib.idle_add(GLib.PRIORITY_DEFAULT, () => {
+        Shell.util_sd_notify();
+        Meta.register_with_session();
+        return GLib.SOURCE_REMOVE;
+    });
 
     _startDate = new Date();
 

src/main.c

@@ -24,14 +24,6 @@
 #include "shell-perf-log.h"
 #include "st.h"
 
-#ifdef HAVE_SYSTEMD
-#include <systemd/sd-daemon.h>
-#else
-/* So we don't need to add ifdef's everywhere */
-#define sd_notify(u, m)            do {} while (0)
-#define sd_notifyf(u, m, ...)      do {} while (0)
-#endif
-
 extern GType gnome_shell_plugin_get_type (void);
 
 #define SHELL_DBUS_SERVICE "org.gnome.Shell"
@@ -532,9 +524,6 @@ main (int argc, char **argv)
   shell_init_debug (g_getenv ("SHELL_DEBUG"));
 
   shell_dbus_init (meta_get_replace_current_wm ());
-  /* We only use NOTIFY_SOCKET exactly once; unset it so it doesn't remain in
-   * our environment. */
-  sd_notify (1, "READY=1");
   shell_a11y_init ();
   shell_perf_log_init ();
   shell_introspection_init ();

src/shell-util.c

@@ -26,6 +26,14 @@
 #include <langinfo.h>
 #endif
 
+#ifdef HAVE_SYSTEMD
+#include <systemd/sd-daemon.h>
+#else
+/* So we don't need to add ifdef's everywhere */
+#define sd_notify(u, m)            do {} while (0)
+#define sd_notifyf(u, m, ...)      do {} while (0)
+#endif
+
 static void
 stop_pick (ClutterActor       *actor,
            const ClutterColor *color)
@@ -659,3 +667,11 @@ shell_util_stop_systemd_unit (const char  *unit,
 {
   return shell_util_systemd_call ("StopUnit", unit, mode, error);
 }
+
+void
+shell_util_sd_notify (void)
+{
+  /* We only use NOTIFY_SOCKET exactly once; unset it so it doesn't remain in
+   * our environment. */
+  sd_notify (1, "READY=1");
+}

src/shell-util.h

@@ -66,6 +66,8 @@ gboolean shell_util_stop_systemd_unit  (const char  *unit,
                                         const char  *mode,
                                         GError     **error);
 
+void shell_util_sd_notify (void);
+
 G_END_DECLS
 
 #endif /* __SHELL_UTIL_H__ */