[gdm/x-gdm-sessionregisters: 3/4] Allow sessions to register with GDM
- From: Iain Lane <iainl src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gdm/x-gdm-sessionregisters: 3/4] Allow sessions to register with GDM
- Date: Tue, 7 May 2019 15:48:27 +0000 (UTC)
commit f88b66f89a623957e1adc9569ce3357a85074b0e
Author: Iain Lane <iainl gnome org>
Date: Tue May 7 16:00:14 2019 +0100
Allow sessions to register with GDM
Recording when sessions start, for Wayland → Xorg fallback or
transitioning to the user session, is currently done with timeouts.
This isn't ideal, because on some very slow machines the timeout can be
hit before the session has had a chance to fail: if gnome-session takes
more than 3 seconds to fail then the session will be considered to have
exited rather than failed, and so we don't do Xorg fallback.
We can do this more reliably if we allow sessions to optionally register
themselves with GDM. Then we will know when they've started, so can shut
down the greeter or fall back to Xorg as appropriate. The mechanism is
that they specify X-GDM-SessionRegisters=true in their file, and then
call RegsterSession on the DisplayManager interface on the bus (added in
the previous commit) to say that they've started up.
If X-GDM-SessionRegisters is missing or false, GDM will call the same
method for them after 10 seconds.
Closes: #483
common/gdm-common.h | 2 +
daemon/gdm-display.c | 16 +------
daemon/gdm-local-display-factory.c | 93 +++++++++++++++++++++++++++++++-------
daemon/gdm-session.c | 47 +++++++++++++++++--
daemon/gdm-session.h | 1 +
daemon/gdm-wayland-session.c | 74 ++++++++++++++++++++++--------
daemon/gdm-x-session.c | 74 ++++++++++++++++++++++--------
7 files changed, 236 insertions(+), 71 deletions(-)
---
diff --git a/common/gdm-common.h b/common/gdm-common.h
index 07812b10..58814aa2 100644
--- a/common/gdm-common.h
+++ b/common/gdm-common.h
@@ -27,6 +27,8 @@
#include <pwd.h>
#include <errno.h>
+#define REGISTER_SESSION_TIMEOUT 10
+
#define VE_IGNORE_EINTR(expr) \
do { \
errno = 0; \
diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index fff5543e..c8b89703 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -66,7 +66,6 @@ typedef struct _GdmDisplayPrivate
char *x11_display_name;
int status;
time_t creation_time;
- GTimer *server_timer;
char *x11_cookie;
gsize x11_cookie_size;
@@ -600,8 +599,6 @@ gdm_display_manage (GdmDisplay *self)
}
}
- g_timer_start (priv->server_timer);
-
if (g_strcmp0 (priv->session_class, "greeter") == 0) {
if (GDM_DISPLAY_GET_CLASS (self)->manage != NULL) {
GDM_DISPLAY_GET_CLASS (self)->manage (self);
@@ -673,7 +670,6 @@ gboolean
gdm_display_unmanage (GdmDisplay *self)
{
GdmDisplayPrivate *priv;
- gdouble elapsed;
g_return_val_if_fail (GDM_IS_DISPLAY (self), FALSE);
@@ -683,8 +679,6 @@ gdm_display_unmanage (GdmDisplay *self)
gdm_display_disconnect (self);
- g_timer_stop (priv->server_timer);
-
if (priv->user_access_file != NULL) {
gdm_display_access_file_close (priv->user_access_file);
g_object_unref (priv->user_access_file);
@@ -697,9 +691,8 @@ gdm_display_unmanage (GdmDisplay *self)
priv->access_file = NULL;
}
- elapsed = g_timer_elapsed (priv->server_timer, NULL);
- if (elapsed < 3) {
- g_warning ("GdmDisplay: display lasted %lf seconds", elapsed);
+ if (!priv->registered) {
+ g_warning ("GdmDisplay: Session never registered, failing");
_gdm_display_set_status (self, GDM_DISPLAY_FAILED);
} else {
_gdm_display_set_status (self, GDM_DISPLAY_UNMANAGED);
@@ -1408,7 +1401,6 @@ gdm_display_init (GdmDisplay *self)
priv = gdm_display_get_instance_private (self);
priv->creation_time = time (NULL);
- priv->server_timer = g_timer_new ();
}
static void
@@ -1446,10 +1438,6 @@ gdm_display_finalize (GObject *object)
g_object_unref (priv->user_access_file);
}
- if (priv->server_timer != NULL) {
- g_timer_destroy (priv->server_timer);
- }
-
G_OBJECT_CLASS (gdm_display_parent_class)->finalize (object);
}
diff --git a/daemon/gdm-local-display-factory.c b/daemon/gdm-local-display-factory.c
index 7dd74a62..95bdbeb7 100644
--- a/daemon/gdm-local-display-factory.c
+++ b/daemon/gdm-local-display-factory.c
@@ -66,7 +66,7 @@ struct _GdmLocalDisplayFactory
#if defined(ENABLE_WAYLAND_SUPPORT) && defined(ENABLE_USER_DISPLAY_SERVER)
unsigned int active_vt;
guint active_vt_watch_id;
- guint wait_to_finish_timeout_id;
+ guint wait_to_register_id;
#endif
};
@@ -605,19 +605,59 @@ lookup_by_session_id (const char *id,
#if defined(ENABLE_WAYLAND_SUPPORT) && defined(ENABLE_USER_DISPLAY_SERVER)
static gboolean
-wait_to_finish_timeout (GdmLocalDisplayFactory *factory)
+lookup_by_vt (const char *id,
+ GdmDisplay *display,
+ gpointer user_data)
{
+ unsigned int vt_to_find = *(unsigned int *) user_data;
+ unsigned int vt;
+ int ret;
+ const char *display_session_id;
+
+ display_session_id = gdm_display_get_session_id (display);
+
+ ret = sd_session_get_vt (display_session_id, &vt);
+
+ if (ret < 0) {
+ g_debug ("Couldn't look up session %s: %s",
+ display_session_id,
+ strerror (-ret));
+ return FALSE;
+ }
+
+ return (vt_to_find == vt);
+}
+
+static void
+on_display_registered_cb (GObject *gobject,
+ GParamSpec *pspec,
+ gpointer user_data)
+{
+ GdmDisplay *display = GDM_DISPLAY (gobject);
+ GdmLocalDisplayFactory *factory = GDM_LOCAL_DISPLAY_FACTORY (user_data);
+ gboolean registered;
+
+ g_object_get (display, "registered", ®istered, NULL);
+
+ if (!registered)
+ return;
+
+ g_debug ("GdmLocalDisplayFactory: display registered, killing login screen");
+
finish_waiting_displays_on_seat (factory, "seat0");
- factory->wait_to_finish_timeout_id = 0;
- return G_SOURCE_REMOVE;
+
+ g_signal_handler_disconnect (factory, factory->wait_to_register_id);
+ factory->wait_to_register_id = 0;
}
static void
maybe_stop_greeter_in_background (GdmLocalDisplayFactory *factory,
- GdmDisplay *display)
+ GdmDisplay *display,
+ GdmDisplay *new_display)
{
g_autofree char *display_session_type = NULL;
gboolean doing_initial_setup = FALSE;
+ gboolean registered;
if (gdm_display_get_status (display) != GDM_DISPLAY_MANAGED) {
g_debug ("GdmLocalDisplayFactory: login window not in managed state, so ignoring");
@@ -642,17 +682,36 @@ maybe_stop_greeter_in_background (GdmLocalDisplayFactory *factory,
return;
}
+ g_debug ("GdmLocalDisplayFactory: old display: %p, new display: %p",
+ display,
+ new_display);
+
g_debug ("GdmLocalDisplayFactory: killing login window once its unused");
+
g_object_set (G_OBJECT (display), "status", GDM_DISPLAY_WAITING_TO_FINISH, NULL);
- /* We stop the greeter after a timeout to avoid flicker */
- if (factory->wait_to_finish_timeout_id != 0)
- g_source_remove (factory->wait_to_finish_timeout_id);
+ /* We stop the greeter once the new session has started fully, when it
+ * registers with us */
+ g_object_get (G_OBJECT (new_display),
+ "registered", ®istered,
+ NULL);
- factory->wait_to_finish_timeout_id =
- g_timeout_add_seconds (WAIT_TO_FINISH_TIMEOUT,
- (GSourceFunc)wait_to_finish_timeout,
- factory);
+ if (registered) {
+ g_debug ("GdmLocalDisplayFactory: new display already registered, killing greeter");
+ finish_waiting_displays_on_seat (factory, "seat0");
+ return;
+ }
+
+ g_debug ("GdmLocalDisplayFactory: new display not yet registered, waiting to kill greeter");
+
+ if (factory->wait_to_register_id != 0)
+ g_source_remove (factory->wait_to_register_id);
+
+ factory->wait_to_register_id = g_signal_connect_object (new_display,
+ "notify::registered",
+ G_CALLBACK (on_display_registered_cb),
+ factory,
+ 0);
}
static gboolean
@@ -741,6 +800,7 @@ on_vt_changed (GIOChannel *source,
if (login_window_vt == previous_vt) {
GdmDisplayStore *store;
GdmDisplay *display;
+ GdmDisplay *new_display = NULL;
g_debug ("GdmLocalDisplayFactory: VT switched from login window");
@@ -748,9 +808,12 @@ on_vt_changed (GIOChannel *source,
display = gdm_display_store_find (store,
lookup_by_session_id,
(gpointer) login_session_id);
+ new_display = gdm_display_store_find (store,
+ lookup_by_vt,
+ (gpointer) &new_vt);
if (display != NULL)
- maybe_stop_greeter_in_background (factory, display);
+ maybe_stop_greeter_in_background (factory, display, new_display);
} else {
g_debug ("GdmLocalDisplayFactory: VT not switched from login window");
}
@@ -831,10 +894,6 @@ gdm_local_display_factory_stop_monitor (GdmLocalDisplayFactory *factory)
factory->seat_removed_id = 0;
}
#if defined(ENABLE_WAYLAND_SUPPORT) && defined(ENABLE_USER_DISPLAY_SERVER)
- if (factory->wait_to_finish_timeout_id != 0) {
- g_source_remove (factory->wait_to_finish_timeout_id);
- factory->wait_to_finish_timeout_id = 0;
- }
if (factory->active_vt_watch_id) {
g_source_remove (factory->active_vt_watch_id);
factory->active_vt_watch_id = 0;
diff --git a/daemon/gdm-session.c b/daemon/gdm-session.c
index 6a116a85..0105eac1 100644
--- a/daemon/gdm-session.c
+++ b/daemon/gdm-session.c
@@ -2837,6 +2837,7 @@ gdm_session_start_session (GdmSession *self,
gboolean allow_remote_connections = FALSE;
char *command;
char *program;
+ char *register_session;
g_return_if_fail (GDM_IS_SESSION (self));
g_return_if_fail (self->session_conversation == NULL);
@@ -2862,6 +2863,8 @@ gdm_session_start_session (GdmSession *self,
run_launcher = TRUE;
}
+ register_session = !gdm_session_session_registers (self) ? "--register-session " : "";
+
if (self->selected_program == NULL) {
gboolean run_xsession_script;
@@ -2879,12 +2882,14 @@ gdm_session_start_session (GdmSession *self,
if (run_launcher) {
if (is_x11) {
- program = g_strdup_printf (LIBEXECDIR "/gdm-x-session %s %s\"%s\"",
+ program = g_strdup_printf (LIBEXECDIR "/gdm-x-session %s%s %s\"%s\"",
+ register_session,
run_xsession_script? "--run-script " : "",
allow_remote_connections?
"--allow-remote-connections " : "",
command);
} else {
- program = g_strdup_printf (LIBEXECDIR "/gdm-wayland-session \"%s\"",
+ program = g_strdup_printf (LIBEXECDIR "/gdm-wayland-session %s\"%s\"",
+ register_session,
command);
}
} else if (run_xsession_script) {
@@ -2897,10 +2902,12 @@ gdm_session_start_session (GdmSession *self,
} else {
if (run_launcher) {
if (is_x11) {
- program = g_strdup_printf (LIBEXECDIR "/gdm-x-session \"%s\"",
+ program = g_strdup_printf (LIBEXECDIR "/gdm-x-session %s\"%s\"",
+ register_session,
self->selected_program);
} else {
- program = g_strdup_printf (LIBEXECDIR "/gdm-wayland-session \"%s\"",
+ program = g_strdup_printf (LIBEXECDIR "/gdm-wayland-session %s\"%s\"",
+ register_session,
self->selected_program);
}
} else {
@@ -3177,6 +3184,38 @@ update_session_type (GdmSession *self)
#endif
}
+gboolean
+gdm_session_session_registers (GdmSession *self)
+{
+ g_autoptr(GError) error = NULL;
+ g_autoptr(GKeyFile) key_file = NULL;
+ gboolean session_registers = FALSE;
+ g_autofree char *filename = NULL;
+
+ g_return_val_if_fail (self != NULL, FALSE);
+ g_return_val_if_fail (GDM_IS_SESSION (self), FALSE);
+
+ filename = get_session_filename (self);
+
+ key_file = load_key_file_for_file (self, filename, NULL);
+
+ session_registers = g_key_file_get_boolean (key_file,
+ G_KEY_FILE_DESKTOP_GROUP,
+ "X-GDM-SessionRegisters",
+ &error);
+ if (!session_registers &&
+ error != NULL &&
+ !g_error_matches (error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND)) {
+ g_warning ("GdmSession: Couldn't read session file '%s'", filename);
+ return FALSE;
+ }
+
+ g_debug ("GdmSession: '%s' %s self", filename,
+ session_registers ? "registers" : "does not register");
+
+ return session_registers;
+}
+
gboolean
gdm_session_bypasses_xsession (GdmSession *self)
{
diff --git a/daemon/gdm-session.h b/daemon/gdm-session.h
index 98acb4f6..3b64ecd2 100644
--- a/daemon/gdm-session.h
+++ b/daemon/gdm-session.h
@@ -76,6 +76,7 @@ const char *gdm_session_get_display_device (GdmSession *sessi
const char *gdm_session_get_display_seat_id (GdmSession *session);
const char *gdm_session_get_session_id (GdmSession *session);
gboolean gdm_session_bypasses_xsession (GdmSession *session);
+gboolean gdm_session_session_registers (GdmSession *session);
GdmSessionDisplayMode gdm_session_get_display_mode (GdmSession *session);
#ifdef ENABLE_WAYLAND_SUPPORT
diff --git a/daemon/gdm-wayland-session.c b/daemon/gdm-wayland-session.c
index 94f49e19..d02c6389 100644
--- a/daemon/gdm-wayland-session.c
+++ b/daemon/gdm-wayland-session.c
@@ -45,6 +45,7 @@ typedef struct
GSubprocess *bus_subprocess;
GDBusConnection *bus_connection;
+ GdmDBusManager *display_manager_proxy;
char *bus_address;
char **environment;
@@ -53,6 +54,8 @@ typedef struct
char *session_command;
int session_exit_status;
+ guint register_session_id;
+
GMainLoop *main_loop;
guint32 debug_enabled : 1;
@@ -385,29 +388,14 @@ static gboolean
register_display (State *state,
GCancellable *cancellable)
{
- GdmDBusManager *manager = NULL;
GError *error = NULL;
gboolean registered = FALSE;
GVariantBuilder details;
- manager = gdm_dbus_manager_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
- G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES |
- G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS,
- "org.gnome.DisplayManager",
- "/org/gnome/DisplayManager/Manager",
- cancellable,
- &error);
-
- if (!manager) {
- g_debug ("could not contact display manager: %s", error->message);
- g_error_free (error);
- goto out;
- }
-
g_variant_builder_init (&details, G_VARIANT_TYPE ("a{ss}"));
g_variant_builder_add (&details, "{ss}", "session-type", "wayland");
- registered = gdm_dbus_manager_call_register_display_sync (manager,
+ registered = gdm_dbus_manager_call_register_display_sync (state->display_manager_proxy,
g_variant_builder_end (&details),
cancellable,
&error);
@@ -416,8 +404,6 @@ register_display (State *state,
g_error_free (error);
}
-out:
- g_clear_object (&manager);
return registered;
}
@@ -439,6 +425,10 @@ clear_state (State **out_state)
g_clear_object (&state->session_subprocess);
g_clear_pointer (&state->environment, g_strfreev);
g_clear_pointer (&state->main_loop, g_main_loop_unref);
+ if (state->register_session_id > 0) {
+ g_source_remove (state->register_session_id);
+ state->register_session_id = 0;
+ }
*out_state = NULL;
}
@@ -454,6 +444,27 @@ on_sigterm (State *state)
return G_SOURCE_CONTINUE;
}
+static gboolean
+register_session_timeout_cb (gpointer user_data)
+{
+ State *state;
+ GError *error = NULL;
+
+ state = (State *) user_data;
+
+ gdm_dbus_manager_call_register_session_sync (state->display_manager_proxy,
+ g_variant_new ("a{sv}", NULL),
+ state->cancellable,
+ &error);
+
+ if (error != NULL) {
+ g_warning ("Could not register session: %s", error->message);
+ g_error_free (error);
+ }
+
+ return G_SOURCE_REMOVE;
+}
+
int
main (int argc,
char **argv)
@@ -464,7 +475,11 @@ main (int argc,
gboolean debug = FALSE;
gboolean ret;
int exit_status = EX_OK;
+ static gboolean register_session = FALSE;
+ GError *error = NULL;
+
static GOptionEntry entries [] = {
+ { "register-session", 0, 0, G_OPTION_ARG_NONE, ®ister_session, "Register session after a
delay", NULL },
{ G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &args, "", "" },
{ NULL }
};
@@ -528,6 +543,20 @@ main (int argc,
goto out;
}
+ state->display_manager_proxy = gdm_dbus_manager_proxy_new_for_bus_sync (
+ G_BUS_TYPE_SYSTEM,
+ G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES | G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS,
+ "org.gnome.DisplayManager",
+ "/org/gnome/DisplayManager/Manager",
+ state->cancellable,
+ &error);
+
+ if (state->display_manager_proxy == NULL) {
+ g_debug ("could not contact display manager: %s", error->message);
+ g_error_free (error);
+ goto out;
+ }
+
ret = register_display (state, state->cancellable);
if (!ret) {
@@ -536,6 +565,15 @@ main (int argc,
goto out;
}
+ if (register_session) {
+ g_debug ("gdm-wayland-session: Will register session in %d seconds",
REGISTER_SESSION_TIMEOUT);
+ state->register_session_id = g_timeout_add_seconds (REGISTER_SESSION_TIMEOUT,
+ register_session_timeout_cb,
+ state);
+ } else {
+ g_debug ("gdm-wayland-session: Session will register itself");
+ }
+
g_main_loop_run (state->main_loop);
/* Only use exit status of session if we're here because it exit */
diff --git a/daemon/gdm-x-session.c b/daemon/gdm-x-session.c
index 3b2fcef4..289581cc 100644
--- a/daemon/gdm-x-session.c
+++ b/daemon/gdm-x-session.c
@@ -51,6 +51,7 @@ typedef struct
GSubprocess *bus_subprocess;
GDBusConnection *bus_connection;
+ GdmDBusManager *display_manager_proxy;
char *bus_address;
char **environment;
@@ -59,6 +60,8 @@ typedef struct
char *session_command;
int session_exit_status;
+ guint register_session_id;
+
GMainLoop *main_loop;
guint32 debug_enabled : 1;
@@ -737,30 +740,15 @@ static gboolean
register_display (State *state,
GCancellable *cancellable)
{
- GdmDBusManager *manager = NULL;
GError *error = NULL;
gboolean registered = FALSE;
GVariantBuilder details;
- manager = gdm_dbus_manager_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
- G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES |
- G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS,
- "org.gnome.DisplayManager",
- "/org/gnome/DisplayManager/Manager",
- cancellable,
- &error);
-
- if (!manager) {
- g_debug ("could not contact display manager: %s", error->message);
- g_error_free (error);
- goto out;
- }
-
g_variant_builder_init (&details, G_VARIANT_TYPE ("a{ss}"));
g_variant_builder_add (&details, "{ss}", "session-type", "x11");
g_variant_builder_add (&details, "{ss}", "x11-display-name", state->display_name);
- registered = gdm_dbus_manager_call_register_display_sync (manager,
+ registered = gdm_dbus_manager_call_register_display_sync (state->display_manager_proxy,
g_variant_builder_end (&details),
cancellable,
&error);
@@ -769,8 +757,6 @@ register_display (State *state,
g_error_free (error);
}
-out:
- g_clear_object (&manager);
return registered;
}
@@ -795,6 +781,10 @@ clear_state (State **out_state)
g_clear_pointer (&state->auth_file, g_free);
g_clear_pointer (&state->display_name, g_free);
g_clear_pointer (&state->main_loop, g_main_loop_unref);
+ if (state->register_session_id > 0) {
+ g_source_remove (state->register_session_id);
+ state->register_session_id = 0;
+ }
*out_state = NULL;
}
@@ -810,6 +800,27 @@ on_sigterm (State *state)
return G_SOURCE_CONTINUE;
}
+static gboolean
+register_session_timeout_cb (gpointer user_data)
+{
+ State *state;
+ GError *error = NULL;
+
+ state = (State *) user_data;
+
+ gdm_dbus_manager_call_register_session_sync (state->display_manager_proxy,
+ g_variant_new ("a{sv}", NULL),
+ state->cancellable,
+ &error);
+
+ if (error != NULL) {
+ g_warning ("Could not register session: %s", error->message);
+ g_error_free (error);
+ }
+
+ return G_SOURCE_REMOVE;
+}
+
int
main (int argc,
char **argv)
@@ -822,9 +833,13 @@ main (int argc,
gboolean debug = FALSE;
gboolean ret;
int exit_status = EX_OK;
+ static gboolean register_session = FALSE;
+ GError *error = NULL;
+
static GOptionEntry entries [] = {
{ "run-script", 'r', 0, G_OPTION_ARG_NONE, &run_script, N_("Run program through
/etc/gdm/Xsession wrapper script"), NULL },
{ "allow-remote-connections", 'a', 0, G_OPTION_ARG_NONE, &allow_remote_connections,
N_("Listen on TCP socket"), NULL },
+ { "register-session", 0, 0, G_OPTION_ARG_NONE, ®ister_session, "Register session after a
delay", NULL },
{ G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &args, "", "" },
{ NULL }
};
@@ -896,6 +911,20 @@ main (int argc,
goto out;
}
+ state->display_manager_proxy = gdm_dbus_manager_proxy_new_for_bus_sync (
+ G_BUS_TYPE_SYSTEM,
+ G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES | G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS,
+ "org.gnome.DisplayManager",
+ "/org/gnome/DisplayManager/Manager",
+ state->cancellable,
+ &error);
+
+ if (state->display_manager_proxy == NULL) {
+ g_debug ("could not contact display manager: %s", error->message);
+ g_error_free (error);
+ goto out;
+ }
+
ret = register_display (state, state->cancellable);
if (!ret) {
@@ -912,6 +941,15 @@ main (int argc,
goto out;
}
+ if (register_session) {
+ g_debug ("gdm-x-session: Will register session in %d seconds", REGISTER_SESSION_TIMEOUT);
+ state->register_session_id = g_timeout_add_seconds (REGISTER_SESSION_TIMEOUT,
+ register_session_timeout_cb,
+ state);
+ } else {
+ g_debug ("gdm-x-session: Session will register itself");
+ }
+
g_main_loop_run (state->main_loop);
/* Only use exit status of session if we're here because it exit */
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