commit 708618746683ea086068e2498fd1c69917c6189a
Author: Ray Strode <rstrode@redhat.com>
Date:   Thu Aug 30 16:09:02 2018 -0400

    gdm-wayland-session,gdm-x-session: register after delay
    
    Right now gdm-x-session registers with GDM as soon as the
    X server is started, and gdm-wayland-session registers as
    soon as the session is started.
    
    Ideally registration wouldn't happen until the session
    says things started successfully.
    
    This commit inches us toward that ideal but adding a little
    timeout before proceeding with registration.
    
    A future commit will add a new xsession file key to allow
    us to know whether or not the session manager of the session
    supports doing registration.

diff --git a/daemon/gdm-wayland-session.c b/daemon/gdm-wayland-session.c
index 94f49e19..de1991b3 100644
--- a/daemon/gdm-wayland-session.c
+++ b/daemon/gdm-wayland-session.c
@@ -454,6 +454,21 @@ on_sigterm (State *state)
         return G_SOURCE_CONTINUE;
 }
 
+static gboolean
+on_registration_delay_complete (State *state)
+{
+        gboolean ret;
+
+        ret = register_display (state, state->cancellable);
+
+        if (!ret) {
+                g_printerr ("Unable to register display with display manager\n");
+                g_main_loop_quit (state->main_loop);
+        }
+
+        return G_SOURCE_REMOVE;
+}
+
 int
 main (int    argc,
       char **argv)
@@ -528,13 +543,7 @@ main (int    argc,
                 goto out;
         }
 
-        ret = register_display (state, state->cancellable);
-
-        if (!ret) {
-                g_printerr ("Unable to register display with display manager\n");
-                exit_status = EX_SOFTWARE;
-                goto out;
-        }
+        g_timeout_add_seconds (2, (GSourceFunc) on_registration_delay_complete, state);
 
         g_main_loop_run (state->main_loop);
 
diff --git a/daemon/gdm-x-session.c b/daemon/gdm-x-session.c
index 3b2fcef4..412999cf 100644
--- a/daemon/gdm-x-session.c
+++ b/daemon/gdm-x-session.c
@@ -810,6 +810,21 @@ on_sigterm (State *state)
         return G_SOURCE_CONTINUE;
 }
 
+static gboolean
+on_registration_delay_complete (State *state)
+{
+        gboolean ret;
+
+        ret = register_display (state, state->cancellable);
+
+        if (!ret) {
+                g_printerr ("Unable to register display with display manager\n");
+                g_main_loop_quit (state->main_loop);
+        }
+
+        return G_SOURCE_REMOVE;
+}
+
 int
 main (int    argc,
       char **argv)
@@ -896,14 +911,6 @@ main (int    argc,
                 goto out;
         }
 
-        ret = register_display (state, state->cancellable);
-
-        if (!ret) {
-                g_printerr ("Unable to register display with display manager\n");
-                exit_status = EX_SOFTWARE;
-                goto out;
-        }
-
         ret = spawn_session (state, run_script, state->cancellable);
 
         if (!ret) {
@@ -912,6 +919,8 @@ main (int    argc,
                 goto out;
         }
 
+        g_timeout_add_seconds (2, (GSourceFunc) on_registration_delay_complete, state);
+
         g_main_loop_run (state->main_loop);
 
         /* Only use exit status of session if we're here because it exit */