306 lines
11 KiB
C
306 lines
11 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
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* gnome-session-tl.c - Small utility program to manage gnome systemd session.
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Copyright (C) 1998 Tom Tromey
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Copyright (C) 2008,2019 Red Hat, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <locale.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <systemd/sd-daemon.h>
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#include <glib.h>
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#include <glib-unix.h>
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#include <glib/gstdio.h>
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#include <glib/gi18n.h>
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#include <gio/gio.h>
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#define GSM_SERVICE_DBUS "org.gnome.SessionManager"
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#define GSM_PATH_DBUS "/org/gnome/SessionManager"
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#define GSM_INTERFACE_DBUS "org.gnome.SessionManager"
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#define SYSTEMD_DBUS "org.freedesktop.systemd1"
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#define SYSTEMD_PATH_DBUS "/org/freedesktop/systemd1"
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#define SYSTEMD_INTERFACE_DBUS "org.freedesktop.systemd1.Manager"
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static GDBusConnection *
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get_session_bus (void)
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{
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g_autoptr(GError) error = NULL;
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GDBusConnection *bus;
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bus = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);
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if (bus == NULL)
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g_warning ("Couldn't connect to session bus: %s", error->message);
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return bus;
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}
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static void
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do_signal_init (void)
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{
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g_autoptr(GDBusConnection) connection = NULL;
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g_autoptr(GVariant) reply = NULL;
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g_autoptr(GError) error = NULL;
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connection = get_session_bus ();
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if (connection == NULL)
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return;
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reply = g_dbus_connection_call_sync (connection,
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GSM_SERVICE_DBUS,
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GSM_PATH_DBUS,
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GSM_INTERFACE_DBUS,
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"Initialized",
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NULL,
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NULL,
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G_DBUS_CALL_FLAGS_NO_AUTO_START,
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-1, NULL, &error);
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if (error != NULL)
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g_warning ("Failed to call signal initialization: %s",
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error->message);
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}
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static void
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do_start_unit (const gchar *unit, const char *mode)
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{
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g_autoptr(GDBusConnection) connection = NULL;
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g_autoptr(GVariant) reply = NULL;
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g_autoptr(GError) error = NULL;
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connection = get_session_bus ();
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if (connection == NULL)
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return;
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reply = g_dbus_connection_call_sync (connection,
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SYSTEMD_DBUS,
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SYSTEMD_PATH_DBUS,
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SYSTEMD_INTERFACE_DBUS,
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"StartUnit",
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g_variant_new ("(ss)",
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unit,
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mode),
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NULL,
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G_DBUS_CALL_FLAGS_NO_AUTO_START,
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-1, NULL, &error);
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if (error != NULL)
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g_warning ("Failed to start shutdown target: %s",
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error->message);
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}
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static void
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do_restart_dbus (void)
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{
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g_autoptr(GDBusConnection) connection = NULL;
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g_autoptr(GVariant) reply = NULL;
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g_autoptr(GError) error = NULL;
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connection = get_session_bus ();
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if (connection == NULL)
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return;
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reply = g_dbus_connection_call_sync (connection,
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SYSTEMD_DBUS,
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SYSTEMD_PATH_DBUS,
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SYSTEMD_INTERFACE_DBUS,
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"StopUnit",
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g_variant_new ("(ss)",
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"dbus.service",
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"fail"),
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NULL,
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G_DBUS_CALL_FLAGS_NO_AUTO_START,
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-1, NULL, &error);
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if (error != NULL)
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g_warning ("Failed to restart DBus service: %s",
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error->message);
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}
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typedef struct {
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GMainLoop *loop;
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gint fifo_fd;
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} MonitorLeader;
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static gboolean
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leader_term_or_int_signal_cb (gpointer user_data)
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{
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MonitorLeader *data = (MonitorLeader*) user_data;
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g_main_quit (data->loop);
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return G_SOURCE_REMOVE;
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}
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static gboolean
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leader_fifo_io_cb (gint fd,
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GIOCondition condition,
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gpointer user_data)
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{
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MonitorLeader *data = (MonitorLeader*) user_data;
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sd_notify (0, "STOPPING=1");
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if (condition & G_IO_IN) {
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char buf[1];
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read (data->fifo_fd, buf, 1);
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g_main_loop_quit (data->loop);
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}
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if (condition & G_IO_HUP) {
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g_main_loop_quit (data->loop);
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}
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return G_SOURCE_CONTINUE;
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}
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/**
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* do_monitor_leader:
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*
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* Function to monitor the leader to ensure clean session shutdown and
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* propagation of this information to/from loginctl/GDM.
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* See main.c systemd_leader_run() for more information.
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*/
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static void
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do_monitor_leader (void)
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{
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MonitorLeader data;
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g_autofree char *fifo_name = NULL;
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int res;
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data.loop = g_main_loop_new (NULL, TRUE);
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fifo_name = g_strdup_printf ("%s/gnome-session-leader-fifo",
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g_get_user_runtime_dir ());
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res = mkfifo (fifo_name, 0666);
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if (res < 0 && errno != EEXIST)
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g_warning ("Error creating FIFO: %m");
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data.fifo_fd = g_open (fifo_name, O_RDONLY | O_CLOEXEC, 0666);
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if (data.fifo_fd >= 0) {
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struct stat buf;
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res = fstat (data.fifo_fd, &buf);
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if (res < 0) {
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g_warning ("Unable to monitor session leader: stat failed with error %m");
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sd_notifyf (0, "STATUS=Unable to monitor session leader: FD is not a FIFO %m");
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close (data.fifo_fd);
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data.fifo_fd = -1;
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} else if (!(buf.st_mode & S_IFIFO)) {
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g_warning ("Unable to monitor session leader: FD is not a FIFO");
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sd_notify (0, "STATUS=Unable to monitor session leader: FD is not a FIFO");
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close (data.fifo_fd);
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data.fifo_fd = -1;
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} else {
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sd_notify (0, "STATUS=Watching session leader");
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g_unix_fd_add (data.fifo_fd, G_IO_HUP | G_IO_IN, leader_fifo_io_cb, &data);
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}
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} else {
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g_warning ("Unable to monitor session leader: Opening FIFO failed with %m");
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sd_notifyf (0, "STATUS=Unable to monitor session leader: Opening FIFO failed with %m");
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}
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g_unix_signal_add (SIGTERM, leader_term_or_int_signal_cb, &data);
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g_unix_signal_add (SIGINT, leader_term_or_int_signal_cb, &data);
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g_main_loop_run (data.loop);
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g_main_loop_unref (data.loop);
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/* FD is closed with the application. */
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}
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int
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main (int argc, char *argv[])
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{
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g_autoptr(GError) error = NULL;
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static gboolean opt_shutdown;
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static gboolean opt_monitor;
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static gboolean opt_signal_init;
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static gboolean opt_restart_dbus;
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static gboolean opt_exec_stop_check;
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int conflicting_options;
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GOptionContext *ctx;
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static const GOptionEntry options[] = {
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{ "shutdown", '\0', 0, G_OPTION_ARG_NONE, &opt_shutdown, N_("Start gnome-session-shutdown.target"), NULL },
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{ "monitor", '\0', 0, G_OPTION_ARG_NONE, &opt_monitor, N_("Start gnome-session-shutdown.target when receiving EOF or a single byte on stdin"), NULL },
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{ "signal-init", '\0', 0, G_OPTION_ARG_NONE, &opt_signal_init, N_("Signal initialization done to gnome-session"), NULL },
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{ "restart-dbus", '\0', 0, G_OPTION_ARG_NONE, &opt_restart_dbus, N_("Restart dbus.service if it is running"), NULL },
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{ "exec-stop-check", '\0', 0, G_OPTION_ARG_NONE, &opt_exec_stop_check, N_("Run from ExecStopPost to start gnome-session-failed.target on service failure"), NULL },
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{ NULL },
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};
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/* Initialize the i18n stuff */
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setlocale (LC_ALL, "");
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bindtextdomain (GETTEXT_PACKAGE, LOCALE_DIR);
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bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
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textdomain (GETTEXT_PACKAGE);
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ctx = g_option_context_new ("");
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g_option_context_add_main_entries (ctx, options, GETTEXT_PACKAGE);
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if (! g_option_context_parse (ctx, &argc, &argv, &error)) {
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g_warning ("Unable to start: %s", error->message);
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exit (1);
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}
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g_option_context_free (ctx);
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conflicting_options = 0;
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if (opt_shutdown)
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conflicting_options++;
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if (opt_monitor)
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conflicting_options++;
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if (opt_signal_init)
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conflicting_options++;
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if (opt_restart_dbus)
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conflicting_options++;
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if (opt_exec_stop_check)
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conflicting_options++;
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if (conflicting_options != 1) {
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g_printerr (_("Program needs exactly one parameter"));
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exit (1);
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}
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sd_notify (0, "READY=1");
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if (opt_signal_init) {
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do_signal_init ();
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} else if (opt_restart_dbus) {
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do_restart_dbus ();
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} else if (opt_shutdown) {
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do_start_unit ("gnome-session-shutdown.target", "replace-irreversibly");
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} else if (opt_monitor) {
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do_monitor_leader ();
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do_start_unit ("gnome-session-shutdown.target", "replace-irreversibly");
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} else if (opt_exec_stop_check) {
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/* Start failed target if the restart limit was hit */
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if (g_strcmp0 ("start-limit-hit", g_getenv ("SERVICE_RESULT")) == 0) {
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do_start_unit ("gnome-session-failed.target", "fail");
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}
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} else {
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g_assert_not_reached ();
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}
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return 0;
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}
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