From f6a8a36717afc7ce00bdb2305a6219c28abc36fb Mon Sep 17 00:00:00 2001

From: Ray Strode <rstrode@redhat.com>

Date: Tue, 1 Sep 2020 13:49:27 -0400

Subject: [PATCH 51/51] display: Handle failure before display registration

Normally, e.g., gdm-wayland-session would register its display

before starting the session.  This display registration is how

the display moves to the "managed" state.  We currently detect

session failure in gdm_display_unmanage. If gdm-wayland-session

is killed before it registers the display, gdm_display_unmanage

won't run, and failure won't be detected.

This commit make gdm_display_unmanage get called, even if the

display isn't yet fully managed.

---

 daemon/gdm-display.c | 8 +++-----

 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c

index ae20491cd..b8ccbbd72 100644

--- a/daemon/gdm-display.c

+++ b/daemon/gdm-display.c

@@ -575,80 +575,79 @@ gdm_display_disconnect (GdmDisplay *self)

                 return;

         }

         setup = xcb_get_setup (self->priv->xcb_connection);

         /* resource_id_mask is the bits given to each client for

          * addressing resources */

         highest_client = (XID) ~unused_bits & ~setup->resource_id_mask;

         client_increment = setup->resource_id_mask + 1;

         /* Kill every client but ourselves, then close our own connection

          */

         for (client = 0;

              client <= highest_client;

              client += client_increment) {

                 if (client != setup->resource_id_base)

                         xcb_kill_client (self->priv->xcb_connection, client);

         }

         xcb_flush (self->priv->xcb_connection);

         g_clear_pointer (&self->priv->xcb_connection, xcb_disconnect);

 }

 gboolean

 gdm_display_unmanage (GdmDisplay *self)

 {

         g_return_val_if_fail (GDM_IS_DISPLAY (self), FALSE);

-        g_debug ("GdmDisplay: unmanage display");

-

         gdm_display_disconnect (self);

         if (self->priv->user_access_file != NULL) {

                 gdm_display_access_file_close (self->priv->user_access_file);

                 g_object_unref (self->priv->user_access_file);

                 self->priv->user_access_file = NULL;

         }

         if (self->priv->access_file != NULL) {

                 gdm_display_access_file_close (self->priv->access_file);

                 g_object_unref (self->priv->access_file);

                 self->priv->access_file = NULL;

         }

         if (!self->priv->session_registered) {

                 g_warning ("GdmDisplay: Session never registered, failing");

                 _gdm_display_set_status (self, GDM_DISPLAY_FAILED);

         } else {

+                g_debug ("GdmDisplay: Unmanage display");

                 _gdm_display_set_status (self, GDM_DISPLAY_UNMANAGED);

         }

         return TRUE;

 }

 gboolean

 gdm_display_get_id (GdmDisplay         *self,

                     char              **id,

                     GError            **error)

 {

         g_return_val_if_fail (GDM_IS_DISPLAY (self), FALSE);

         if (id != NULL) {

                 *id = g_strdup (self->priv->id);

         }

         return TRUE;

 }

 gboolean

 gdm_display_get_x11_display_name (GdmDisplay   *self,

                                   char        **x11_display,

                                   GError      **error)

 {

         g_return_val_if_fail (GDM_IS_DISPLAY (self), FALSE);

         if (x11_display != NULL) {

                 *x11_display = g_strdup (self->priv->x11_display_name);

         }

@@ -1309,63 +1308,62 @@ gdm_display_finalize (GObject *object)

 GDBusObjectSkeleton *

 gdm_display_get_object_skeleton (GdmDisplay *self)

 {

         return self->priv->object_skeleton;

 }

 static void

 on_launch_environment_session_opened (GdmLaunchEnvironment *launch_environment,

                                       GdmDisplay           *self)

 {

         char       *session_id;

         g_debug ("GdmDisplay: Greeter session opened");

         session_id = gdm_launch_environment_get_session_id (launch_environment);

         _gdm_display_set_session_id (self, session_id);

         g_free (session_id);

 }

 static void

 on_launch_environment_session_started (GdmLaunchEnvironment *launch_environment,

                                        GdmDisplay           *self)

 {

         g_debug ("GdmDisplay: Greeter started");

 }

 static void

 self_destruct (GdmDisplay *self)

 {

         g_object_ref (self);

-        if (gdm_display_get_status (self) == GDM_DISPLAY_MANAGED) {

-                gdm_display_unmanage (self);

-        }

+        g_debug ("GdmDisplay: initiating display self-destruct");

+        gdm_display_unmanage (self);

         if (gdm_display_get_status (self) != GDM_DISPLAY_FINISHED) {

                 queue_finish (self);

         }

         g_object_unref (self);

 }

 static void

 on_launch_environment_session_stopped (GdmLaunchEnvironment *launch_environment,

                                        GdmDisplay           *self)

 {

         g_debug ("GdmDisplay: Greeter stopped");

         self_destruct (self);

 }

 static void

 on_launch_environment_session_exited (GdmLaunchEnvironment *launch_environment,

                                       int                   code,

                                       GdmDisplay           *self)

 {

         g_debug ("GdmDisplay: Greeter exited: %d", code);

         self_destruct (self);

 }

 static void

 on_launch_environment_session_died (GdmLaunchEnvironment *launch_environment,

                                     int                   signal,

                                     GdmDisplay           *self)

 {

         g_debug ("GdmDisplay: Greeter died: %d", signal);

-- 

2.27.0