windowManager: Wait for X11 services using systemd
To do this, we now wait for the start/stop job to complete. We also have two targets in gnome-session to ensure that everything is working as expected. In order to start the services, we simply request the gnome-session-x11-services-ready.target unit, and wait for it to become available. To stop, we use the gnome-session-x11-services.target unit which should stop all services in a way that is entirely race free. This requires both gnome-session and gnome-settings-daemon changes to work (which are in the corresponding merge requests). https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/895
This commit is contained in:
Benjamin Berg
Benjamin Berg
parent
41d5b1455f
commit
01a927f388
@ -42,6 +42,11 @@ const GsdWacomProxy = Gio.DBusProxy.makeProxyWrapper(GsdWacomIface);
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const WINDOW_DIMMER_EFFECT_NAME = "gnome-shell-window-dimmer";
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Gio._promisify(Shell,
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'util_start_systemd_unit', 'util_start_systemd_unit_finish');
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Gio._promisify(Shell,
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'util_stop_systemd_unit', 'util_stop_systemd_unit_finish');
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var DisplayChangeDialog = GObject.registerClass(
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class DisplayChangeDialog extends ModalDialog.ModalDialog {
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_init(wm) {
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@ -901,46 +906,23 @@ var WindowManager = class {
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global.display.connect('init-xserver', (display, task) => {
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IBusManager.getIBusManager().restartDaemon(['--xim']);
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try {
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if (!Shell.util_start_systemd_unit('gsd-xsettings.target', 'fail'))
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log('Not starting gsd-xsettings; waiting for gnome-session to do so');
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/* Timeout waiting for start job completion after 5 seconds */
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let cancellable = new Gio.Cancellable();
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GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 5, () => {
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cancellable.cancel();
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return GLib.SOURCE_REMOVE;
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});
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/* Leave this watchdog timeout so don't block indefinitely here */
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let timeoutId = GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 5, () => {
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Gio.DBus.session.unwatch_name(watchId);
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log('Warning: Failed to start gsd-xsettings');
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task.return_boolean(true);
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timeoutId = 0;
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return GLib.SOURCE_REMOVE;
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});
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/* When gsd-xsettings daemon is started, we are good to resume */
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let watchId = Gio.DBus.session.watch_name(
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'org.gnome.SettingsDaemon.XSettings',
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Gio.BusNameWatcherFlags.NONE,
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() => {
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Gio.DBus.session.unwatch_name(watchId);
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if (timeoutId > 0) {
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task.return_boolean(true);
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GLib.source_remove(timeoutId);
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}
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},
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null);
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} catch (e) {
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log('Error starting gsd-xsettings: %s'.format(e.message));
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task.return_boolean(true);
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}
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this._startX11Services(task, cancellable);
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return true;
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});
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global.display.connect('x11-display-closing', () => {
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if (!Meta.is_wayland_compositor())
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return;
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try {
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Shell.util_stop_systemd_unit('gsd-xsettings.target', 'fail');
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} catch (e) {
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log('Error stopping gsd-xsettings: %s'.format(e.message));
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}
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this._stopX11Services(null);
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IBusManager.getIBusManager().restartDaemon();
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});
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@ -1008,6 +990,36 @@ var WindowManager = class {
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global.stage.add_action(topDragAction);
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}
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async _startX11Services(task, cancellable) {
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try {
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await Shell.util_start_systemd_unit(
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'gnome-session-x11-services-ready.target', 'fail', cancellable);
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} catch (e) {
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// Ignore NOT_SUPPORTED error, which indicates we are not systemd
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// managed and gnome-session will have taken care of everything
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// already.
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// Note that we do log cancellation from here.
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if (!e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.NOT_SUPPORTED))
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log('Error starting X11 services: %s'.format(e.message));
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} finally {
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task.return_boolean(true);
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}
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}
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async _stopX11Services(cancellable) {
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try {
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await Shell.util_stop_systemd_unit(
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'gnome-session-x11-services.target', 'fail', cancellable);
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} catch (e) {
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// Ignore NOT_SUPPORTED error, which indicates we are not systemd
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// managed and gnome-session will have taken care of everything
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// already.
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// Note that we do log cancellation from here.
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if (!e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.NOT_SUPPORTED))
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log('Error stopping X11 services: %s'.format(e.message));
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}
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}
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_showPadOsd(display, device, settings, imagePath, editionMode, monitorIndex) {
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this._currentPadOsd = new PadOsd.PadOsd(device, settings, imagePath, editionMode, monitorIndex);
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this._currentPadOsd.connect('closed', () => (this._currentPadOsd = null));
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236
src/shell-util.c
236
src/shell-util.c
@ -570,6 +570,57 @@ shell_util_get_uid (void)
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return getuid ();
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}
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typedef struct {
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GDBusConnection *connection;
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gchar *command;
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GCancellable *cancellable;
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gulong cancel_id;
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guint job_watch;
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gchar *job;
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} SystemdCall;
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static void
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shell_util_systemd_call_data_free (SystemdCall *data)
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{
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if (data->job_watch)
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{
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g_dbus_connection_signal_unsubscribe (data->connection, data->job_watch);
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data->job_watch = 0;
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}
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if (data->cancellable)
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{
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g_cancellable_disconnect (data->cancellable, data->cancel_id);
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g_clear_object (&data->cancellable);
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data->cancel_id = 0;
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}
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g_clear_object (&data->connection);
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g_clear_pointer (&data->job, g_free);
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g_clear_pointer (&data->command, g_free);
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g_free (data);
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}
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static void
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shell_util_systemd_call_cancelled_cb (GCancellable *cancellable,
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GTask *task)
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{
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SystemdCall *data = g_task_get_task_data (task);
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/* Task has returned, but data is not yet free'ed, ignore signal. */
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if (g_task_get_completed (task))
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return;
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/* We are still in the DBus call; it will return the error. */
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if (data->job == NULL)
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return;
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g_task_return_error_if_cancelled (task);
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g_object_unref (task);
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}
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static void
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on_systemd_call_cb (GObject *source,
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GAsyncResult *res,
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@ -577,46 +628,143 @@ on_systemd_call_cb (GObject *source,
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{
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g_autoptr (GVariant) reply = NULL;
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g_autoptr (GError) error = NULL;
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const gchar *command = user_data;
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GTask *task = G_TASK (user_data);
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SystemdCall *data;
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reply = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source),
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res, &error);
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if (error)
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g_warning ("Could not issue '%s' systemd call", command);
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data = g_task_get_task_data (task);
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if (error) {
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g_warning ("Could not issue '%s' systemd call", data->command);
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g_task_return_error (task, g_steal_pointer (&error));
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g_object_unref (task);
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return;
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}
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g_assert (data->job == NULL);
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g_variant_get (reply, "(o)", &data->job);
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/* And we wait for the JobRemoved notification. */
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}
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static gboolean
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shell_util_systemd_call (const char *command,
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const char *unit,
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const char *mode,
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GError **error)
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static void
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on_systemd_job_removed_cb (GDBusConnection *connection,
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const gchar *sender_name,
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const gchar *object_path,
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const gchar *interface_name,
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const gchar *signal_name,
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GVariant *parameters,
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gpointer user_data)
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{
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GTask *task = G_TASK (user_data);
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SystemdCall *data;
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guint32 id;
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const char *path, *unit, *result;
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/* Task has returned, but data is not yet free'ed, ignore signal. */
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if (g_task_get_completed (task))
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return;
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data = g_task_get_task_data (task);
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/* No job information yet, ignore. */
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if (data->job == NULL)
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return;
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g_variant_get (parameters, "(u&o&s&s)", &id, &path, &unit, &result);
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/* Is it the job we are waiting for? */
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if (g_strcmp0 (path, data->job) != 0)
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return;
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/* Task has completed; return the result of the job */
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if (g_strcmp0 (result, "done") == 0)
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g_task_return_boolean (task, TRUE);
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else
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g_task_return_new_error (task,
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G_IO_ERROR,
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G_IO_ERROR_FAILED,
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"Systemd job completed with status \"%s\"",
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result);
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g_object_unref (task);
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}
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static void
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shell_util_systemd_call (const char *command,
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const char *unit,
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const char *mode,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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g_autoptr (GTask) task = g_task_new (NULL, cancellable, callback, user_data);
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#ifdef HAVE_SYSTEMD
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g_autoptr (GDBusConnection) connection = NULL;
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GError *error = NULL;
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SystemdCall *data;
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g_autofree char *self_unit = NULL;
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int res;
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connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);
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if (connection == NULL) {
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g_task_return_error (task, error);
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return;
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}
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/* We look up the systemd unit that our own process is running in here.
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* This way we determine whether the session is managed using systemd.
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*/
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res = sd_pid_get_user_unit (getpid (), &self_unit);
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if (res == -ENODATA)
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{
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g_debug ("Not systemd-managed, not doing '%s' on '%s'", mode, unit);
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return FALSE;
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g_task_return_new_error (task,
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G_IO_ERROR,
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G_IO_ERROR_NOT_SUPPORTED,
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"Not systemd managed");
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return;
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}
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else if (res < 0)
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{
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g_set_error (error,
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G_IO_ERROR,
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g_io_error_from_errno (-res),
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"Error trying to start systemd unit '%s': %s",
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unit, g_strerror (-res));
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return FALSE;
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g_task_return_new_error (task,
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G_IO_ERROR,
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g_io_error_from_errno (-res),
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"Error fetching own systemd unit: %s",
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g_strerror (-res));
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return;
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}
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connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, error);
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data = g_new0 (SystemdCall, 1);
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data->command = g_strdup (command);
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data->connection = g_object_ref (connection);
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data->job_watch = g_dbus_connection_signal_subscribe (connection,
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"org.freedesktop.systemd1",
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"org.freedesktop.systemd1.Manager",
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"JobRemoved",
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"/org/freedesktop/systemd1",
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NULL,
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G_DBUS_SIGNAL_FLAGS_NONE,
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on_systemd_job_removed_cb,
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task,
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NULL);
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g_task_set_task_data (task,
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data,
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(GDestroyNotify) shell_util_systemd_call_data_free);
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if (connection == NULL)
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return FALSE;
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if (cancellable)
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{
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data->cancellable = g_object_ref (cancellable);
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data->cancel_id = g_cancellable_connect (cancellable,
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G_CALLBACK (shell_util_systemd_call_cancelled_cb),
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task,
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NULL);
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}
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g_dbus_connection_call (connection,
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"org.freedesktop.systemd1",
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@ -625,31 +773,53 @@ shell_util_systemd_call (const char *command,
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command,
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g_variant_new ("(ss)",
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unit, mode),
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NULL,
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G_VARIANT_TYPE ("(o)"),
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G_DBUS_CALL_FLAGS_NONE,
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-1, NULL,
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-1, cancellable,
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on_systemd_call_cb,
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(gpointer) command);
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return TRUE;
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#endif /* HAVE_SYSTEMD */
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g_steal_pointer (&task));
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#else /* HAVE_SYSTEMD */
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g_task_return_new_error (task,
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G_IO_ERROR,
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G_IO_ERROR_NOT_SUPPORTED,
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"systemd not supported by gnome-shell");
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#endif /* !HAVE_SYSTEMD */
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}
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return FALSE;
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void
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shell_util_start_systemd_unit (const char *unit,
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const char *mode,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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shell_util_systemd_call ("StartUnit", unit, mode,
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cancellable, callback, user_data);
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}
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gboolean
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shell_util_start_systemd_unit (const char *unit,
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const char *mode,
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GError **error)
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shell_util_start_systemd_unit_finish (GAsyncResult *res,
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GError **error)
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{
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return shell_util_systemd_call ("StartUnit", unit, mode, error);
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return g_task_propagate_boolean (G_TASK (res), error);
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}
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void
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shell_util_stop_systemd_unit (const char *unit,
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const char *mode,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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shell_util_systemd_call ("StopUnit", unit, mode,
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cancellable, callback, user_data);
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}
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gboolean
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shell_util_stop_systemd_unit (const char *unit,
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const char *mode,
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GError **error)
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shell_util_stop_systemd_unit_finish (GAsyncResult *res,
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GError **error)
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{
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return shell_util_systemd_call ("StopUnit", unit, mode, error);
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return g_task_propagate_boolean (G_TASK (res), error);
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}
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void
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@ -59,12 +59,21 @@ cairo_surface_t * shell_util_composite_capture_images (ClutterCapture *captures
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void shell_util_check_cloexec_fds (void);
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gboolean shell_util_start_systemd_unit (const char *unit,
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const char *mode,
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GError **error);
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gboolean shell_util_stop_systemd_unit (const char *unit,
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const char *mode,
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GError **error);
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void shell_util_start_systemd_unit (const char *unit,
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const char *mode,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean shell_util_start_systemd_unit_finish (GAsyncResult *res,
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GError **error);
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void shell_util_stop_systemd_unit (const char *unit,
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const char *mode,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean shell_util_stop_systemd_unit_finish (GAsyncResult *res,
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GError **error);
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void shell_util_sd_notify (void);
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