From 9a3e9cb9a6bbf68ed6eb9f13d143a63af940f3ae Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Mon, 30 Jul 2018 16:21:29 -0400
Subject: [PATCH 12/51] daemon: try harder to get to a login screen at logout
commit 22c332ba and some follow up commits try to ensure the
user never stays on a blank VT by jumping to a login screen in
the event they'd end up on one.
Unfortunately, that part of the code can't start a login screen
if there's not one running at all.
This commit moves the code to GdmLocalDisplyFactory where the
login screens are created, so users won't end up on a blank
VT even if no login screen is yet running.
---
daemon/gdm-local-display-factory.c | 36 +++++++-
daemon/gdm-manager.c | 143 -----------------------------
2 files changed, 31 insertions(+), 148 deletions(-)
diff --git a/daemon/gdm-local-display-factory.c b/daemon/gdm-local-display-factory.c
index e52360a56..0e454c880 100644
--- a/daemon/gdm-local-display-factory.c
+++ b/daemon/gdm-local-display-factory.c
@@ -1,60 +1,62 @@
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <glib-object.h>
#include <gio/gio.h>
+#include <systemd/sd-login.h>
+
#include "gdm-common.h"
#include "gdm-manager.h"
#include "gdm-display-factory.h"
#include "gdm-local-display-factory.h"
#include "gdm-local-display-factory-glue.h"
#include "gdm-settings-keys.h"
#include "gdm-settings-direct.h"
#include "gdm-display-store.h"
#include "gdm-local-display.h"
#include "gdm-legacy-display.h"
#define GDM_LOCAL_DISPLAY_FACTORY_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_LOCAL_DISPLAY_FACTORY, GdmLocalDisplayFactoryPrivate))
#define GDM_DBUS_PATH "/org/gnome/DisplayManager"
#define GDM_LOCAL_DISPLAY_FACTORY_DBUS_PATH GDM_DBUS_PATH "/LocalDisplayFactory"
#define GDM_MANAGER_DBUS_NAME "org.gnome.DisplayManager.LocalDisplayFactory"
#define MAX_DISPLAY_FAILURES 5
struct GdmLocalDisplayFactoryPrivate
{
GdmDBusLocalDisplayFactory *skeleton;
GDBusConnection *connection;
GHashTable *used_display_numbers;
/* FIXME: this needs to be per seat? */
guint num_failures;
guint seat_new_id;
@@ -240,174 +242,198 @@ gdm_local_display_factory_create_transient_display (GdmLocalDisplayFactory *fact
store_display (factory, display);
if (! gdm_display_manage (display)) {
display = NULL;
goto out;
}
if (! gdm_display_get_id (display, id, NULL)) {
display = NULL;
goto out;
}
ret = TRUE;
out:
/* ref either held by store or not at all */
g_object_unref (display);
return ret;
}
static void
on_display_status_changed (GdmDisplay *display,
GParamSpec *arg1,
GdmLocalDisplayFactory *factory)
{
int status;
int num;
char *seat_id = NULL;
char *session_type = NULL;
+ char *session_class = NULL;
gboolean is_initial = TRUE;
gboolean is_local = TRUE;
num = -1;
gdm_display_get_x11_display_number (display, &num, NULL);
g_object_get (display,
"seat-id", &seat_id,
"is-initial", &is_initial,
"is-local", &is_local,
"session-type", &session_type,
+ "session-class", &session_class,
NULL);
status = gdm_display_get_status (display);
g_debug ("GdmLocalDisplayFactory: display status changed: %d", status);
switch (status) {
case GDM_DISPLAY_FINISHED:
/* remove the display number from factory->priv->used_display_numbers
so that it may be reused */
if (num != -1) {
g_hash_table_remove (factory->priv->used_display_numbers, GUINT_TO_POINTER (num));
}
gdm_display_factory_queue_purge_displays (GDM_DISPLAY_FACTORY (factory));
/* if this is a local display, do a full resync. Only
* seats without displays will get created anyway. This
* ensures we get a new login screen when the user logs out,
* if there isn't one.
*/
- if (is_local) {
+ if (is_local && g_strcmp0 (session_class, "greeter") != 0) {
/* reset num failures */
factory->priv->num_failures = 0;
gdm_local_display_factory_sync_seats (factory);
}
break;
case GDM_DISPLAY_FAILED:
/* leave the display number in factory->priv->used_display_numbers
so that it doesn't get reused */
gdm_display_factory_queue_purge_displays (GDM_DISPLAY_FACTORY (factory));
/* Create a new equivalent display if it was static */
if (is_local) {
factory->priv->num_failures++;
if (factory->priv->num_failures > MAX_DISPLAY_FAILURES) {
/* oh shit */
g_warning ("GdmLocalDisplayFactory: maximum number of X display failures reached: check X server log for errors");
} else {
#ifdef ENABLE_WAYLAND_SUPPORT
if (g_strcmp0 (session_type, "wayland") == 0) {
g_free (session_type);
session_type = NULL;
/* workaround logind race for now
* bug 1643874
*/
g_usleep (2 * G_USEC_PER_SEC);
}
#endif
create_display (factory, seat_id, session_type, is_initial);
}
}
break;
case GDM_DISPLAY_UNMANAGED:
break;
case GDM_DISPLAY_PREPARED:
break;
case GDM_DISPLAY_MANAGED:
break;
default:
g_assert_not_reached ();
break;
}
g_free (seat_id);
g_free (session_type);
+ g_free (session_class);
}
static gboolean
lookup_by_seat_id (const char *id,
GdmDisplay *display,
gpointer user_data)
{
const char *looking_for = user_data;
char *current;
gboolean res;
g_object_get (G_OBJECT (display), "seat-id", ¤t, NULL);
res = g_strcmp0 (current, looking_for) == 0;
g_free(current);
return res;
}
static GdmDisplay *
create_display (GdmLocalDisplayFactory *factory,
const char *seat_id,
const char *session_type,
gboolean initial)
{
GdmDisplayStore *store;
GdmDisplay *display = NULL;
+ char *active_session_id = NULL;
+ int ret;
- /* Ensure we don't create the same display more than once */
store = gdm_display_factory_get_display_store (GDM_DISPLAY_FACTORY (factory));
- display = gdm_display_store_find (store, lookup_by_seat_id, (gpointer) seat_id);
- if (display != NULL) {
- return NULL;
+
+ ret = sd_seat_get_active (seat_id, &active_session_id, NULL);
+
+ if (ret == 0) {
+ char *login_session_id = NULL;
+
+ /* If we already have a login window, switch to it */
+ if (gdm_get_login_window_session_id (seat_id, &login_session_id)) {
+ if (g_strcmp0 (active_session_id, login_session_id) != 0) {
+ gdm_activate_session_by_id (factory->priv->connection, seat_id, login_session_id);
+ }
+ g_clear_pointer (&login_session_id, g_free);
+ g_clear_pointer (&active_session_id, g_free);
+ return NULL;
+ }
+ g_clear_pointer (&active_session_id, g_free);
+ } else {
+ /* Ensure we don't create the same display more than once */
+ display = gdm_display_store_find (store, lookup_by_seat_id, (gpointer) seat_id);
+
+ if (display != NULL) {
+ return NULL;
+ }
}
g_debug ("GdmLocalDisplayFactory: Adding display on seat %s", seat_id);
#ifdef ENABLE_USER_DISPLAY_SERVER
if (g_strcmp0 (seat_id, "seat0") == 0) {
display = gdm_local_display_new ();
if (session_type != NULL) {
g_object_set (G_OBJECT (display), "session-type", session_type, NULL);
}
}
#endif
if (display == NULL) {
guint32 num;
num = take_next_display_number (factory);
display = gdm_legacy_display_new (num);
}
g_object_set (display, "seat-id", seat_id, NULL);
g_object_set (display, "is-initial", initial, NULL);
store_display (factory, display);
/* let store own the ref */
g_object_unref (display);
if (! gdm_display_manage (display)) {
diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index ede22e771..80f60d24c 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -1322,202 +1322,60 @@ maybe_start_pending_initial_login (GdmManager *manager,
char *user_session_seat_id = NULL;
/* There may be a user session waiting to be started.
* This would happen if we couldn't start it earlier because
* the login screen X server was coming up and two X servers
* can't be started on the same seat at the same time.
*/
if (manager->priv->initial_login_operation == NULL) {
return;
}
operation = manager->priv->initial_login_operation;
g_object_get (G_OBJECT (greeter_display),
"seat-id", &greeter_seat_id,
NULL);
g_object_get (G_OBJECT (operation->session),
"display-seat-id", &user_session_seat_id,
NULL);
if (g_strcmp0 (greeter_seat_id, user_session_seat_id) == 0) {
start_user_session (manager, operation);
manager->priv->initial_login_operation = NULL;
}
g_free (greeter_seat_id);
g_free (user_session_seat_id);
}
-static gboolean
-get_login_window_session_id (const char *seat_id,
- char **session_id)
-{
- gboolean ret;
- int res, i;
- char **sessions;
- char *service_id;
- char *service_class;
- char *state;
-
- res = sd_seat_get_sessions (seat_id, &sessions, NULL, NULL);
- if (res < 0) {
- g_debug ("Failed to determine sessions: %s", strerror (-res));
- return FALSE;
- }
-
- if (sessions == NULL || sessions[0] == NULL) {
- *session_id = NULL;
- ret = FALSE;
- goto out;
- }
-
- for (i = 0; sessions[i]; i ++) {
-
- res = sd_session_get_class (sessions[i], &service_class);
- if (res < 0) {
- if (res == -ENOENT) {
- free (service_class);
- continue;
- }
-
- g_debug ("failed to determine class of session %s: %s", sessions[i], strerror (-res));
- ret = FALSE;
- goto out;
- }
-
- if (strcmp (service_class, "greeter") != 0) {
- free (service_class);
- continue;
- }
-
- free (service_class);
-
- ret = sd_session_get_state (sessions[i], &state);
- if (ret < 0) {
- if (res == -ENOENT)
- continue;
-
- g_debug ("failed to determine state of session %s: %s", sessions[i], strerror (-res));
- ret = FALSE;
- goto out;
- }
-
- if (g_strcmp0 (state, "closing") == 0) {
- free (state);
- continue;
- }
- free (state);
-
- res = sd_session_get_service (sessions[i], &service_id);
- if (res < 0) {
- if (res == -ENOENT)
- continue;
- g_debug ("failed to determine service of session %s: %s", sessions[i], strerror (-res));
- ret = FALSE;
- goto out;
- }
-
- if (strcmp (service_id, "gdm-launch-environment") == 0) {
- *session_id = g_strdup (sessions[i]);
- ret = TRUE;
-
- free (service_id);
- goto out;
- }
-
- free (service_id);
- }
-
- *session_id = NULL;
- ret = FALSE;
-
-out:
- if (sessions) {
- for (i = 0; sessions[i]; i ++) {
- free (sessions[i]);
- }
-
- free (sessions);
- }
-
- return ret;
-}
-
-static void
-activate_login_window_session_on_seat (GdmManager *self,
- const char *seat_id)
-{
- char *session_id;
-
- if (!gdm_get_login_window_session_id (seat_id, &session_id)) {
- return;
- }
-
- if (session_id) {
- activate_session_id (self, seat_id, session_id);
- g_free (session_id);
- }
-}
-
-static void
-maybe_activate_other_session (GdmManager *self,
- GdmDisplay *old_display)
-{
- char *seat_id = NULL;
- char *session_id = NULL;
- int ret;
-
- g_object_get (G_OBJECT (old_display),
- "seat-id", &seat_id,
- NULL);
-
- ret = sd_seat_get_active (seat_id, &session_id, NULL);
-
- if (ret == 0) {
- GdmDisplay *display;
-
- display = gdm_display_store_find (self->priv->display_store,
- lookup_by_session_id,
- (gpointer) session_id);
-
- if (display == NULL || gdm_display_get_status (display) == GDM_DISPLAY_FINISHED) {
- activate_login_window_session_on_seat (self, seat_id);
- }
-
- g_free (session_id);
- }
-
- g_free (seat_id);
-}
-
static const char *
get_username_for_greeter_display (GdmManager *manager,
GdmDisplay *display)
{
gboolean doing_initial_setup = FALSE;
g_object_get (G_OBJECT (display),
"doing-initial-setup", &doing_initial_setup,
NULL);
if (doing_initial_setup) {
return INITIAL_SETUP_USERNAME;
} else {
return GDM_USERNAME;
}
}
static void
set_up_automatic_login_session (GdmManager *manager,
GdmDisplay *display)
{
GdmSession *session;
char *display_session_type = NULL;
gboolean is_initial;
/* 0 is root user; since the daemon talks to the session object
* directly, itself, for automatic login
*/
session = create_user_session_for_display (manager, display, 0);
@@ -1709,61 +1567,60 @@ on_display_status_changed (GdmDisplay *display,
if ((display_number == -1 && status == GDM_DISPLAY_PREPARED) ||
(display_number != -1 && status == GDM_DISPLAY_MANAGED)) {
char *session_class;
g_object_get (display,
"session-class", &session_class,
NULL);
if (g_strcmp0 (session_class, "greeter") == 0)
set_up_session (manager, display);
g_free (session_class);
}
if (status == GDM_DISPLAY_MANAGED) {
greeter_display_started (manager, display);
}
break;
case GDM_DISPLAY_FAILED:
case GDM_DISPLAY_UNMANAGED:
case GDM_DISPLAY_FINISHED:
#ifdef WITH_PLYMOUTH
if (quit_plymouth) {
plymouth_quit_without_transition ();
manager->priv->plymouth_is_running = FALSE;
}
#endif
if (status == GDM_DISPLAY_FINISHED || g_strcmp0 (session_type, "x11") == 0) {
manager->priv->ran_once = TRUE;
}
maybe_start_pending_initial_login (manager, display);
- maybe_activate_other_session (manager, display);
break;
default:
break;
}
}
static void
on_display_removed (GdmDisplayStore *display_store,
GdmDisplay *display,
GdmManager *manager)
{
char *id;
gdm_display_get_id (display, &id, NULL);
g_dbus_object_manager_server_unexport (manager->priv->object_manager, id);
g_free (id);
g_signal_handlers_disconnect_by_func (display, G_CALLBACK (on_display_status_changed), manager);
g_signal_emit (manager, signals[DISPLAY_REMOVED], 0, display);
}
static void
destroy_start_user_session_operation (StartUserSessionOperation *operation)
{
g_object_set_data (G_OBJECT (operation->session),
"start-user-session-operation",
NULL);
g_object_unref (operation->session);
--
2.27.0