logind: add .ScheduleShutdown and .CancelScheduledShutdown methods

Add a method called ScheduleShutdown in org.freedesktop.login1.Manager
which adds a timer to shut down the system at a later point in time.

The first argument holds the type of the schedule that is about to
happen, and must be one of 'reboot', 'halt' or 'poweroff'.

The second argument specifies the absolute time, based on
CLOCK_REALTIME in nanoseconds, at which the the operation should be
executed.

To cancel a previously scheduled shutdown, the CancelScheduledShutdown()
can be called, which returns a bool, indicating whether a scheduled
timeout was cancelled.

Also add a new property called ScheduledShutdown which returns the
equivalent to what was passed in via ScheduleShutdown, as '(st)' type.

3 files changed, 144 insertions, 0 deletions

diff --git a/src/login/logind-dbus.c b/src/login/logind-dbus.c
index f638fe0970..0fcf2cc960 100644
--- a/src/login/logind-dbus.c
+++ b/src/login/logind-dbus.c
@@ -213,6 +213,33 @@ static int property_get_preparing(
         return sd_bus_message_append(reply, "b", b);
 }
 
+static int property_get_scheduled_shutdown(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
+
+        Manager *m = userdata;
+        int r;
+
+        assert(bus);
+        assert(reply);
+        assert(m);
+
+        r = sd_bus_message_open_container(reply, 'r', "st");
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(reply, "st", m->scheduled_shutdown_type, m->scheduled_shutdown_timeout);
+        if (r < 0)
+                return r;
+
+        return sd_bus_message_close_container(reply);
+}
+
 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_handle_action, handle_action, HandleAction);
 
 static int method_get_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
@@ -1742,6 +1769,114 @@ static int method_suspend(sd_bus *bus, sd_bus_message *message, void *userdata,
                         error);
 }
 
+static int manager_scheduled_shutdown_handler(
+                        sd_event_source *s,
+                        uint64_t usec,
+                        void *userdata) {
+
+        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        Manager *m = userdata;
+        const char *target;
+        int r;
+
+        assert(m);
+
+        if (isempty(m->scheduled_shutdown_type))
+                return 0;
+
+        if (streq(m->scheduled_shutdown_type, "halt"))
+                target = SPECIAL_HALT_TARGET;
+        else if (streq(m->scheduled_shutdown_type, "poweroff"))
+                target = SPECIAL_POWEROFF_TARGET;
+        else
+                target = SPECIAL_REBOOT_TARGET;
+
+        r = execute_shutdown_or_sleep(m, 0, target, &error);
+        if (r < 0)
+                return log_error_errno(r, "Unable to execute transition to %s: %m\n", target);
+
+        return 0;
+}
+
+static int method_schedule_shutdown(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+        const char *action_multiple_sessions = NULL;
+        const char *action_ignore_inhibit = NULL;
+        const char *action = NULL;
+        uint64_t elapse;
+        char *type;
+        int r;
+
+        assert(m);
+        assert(message);
+
+        r = sd_bus_message_read(message, "st", &type, &elapse);
+        if (r < 0)
+                return r;
+
+        if (streq(type, "reboot")) {
+                action = "org.freedesktop.login1.reboot";
+                action_multiple_sessions = "org.freedesktop.login1.reboot-multiple-sessions";
+                action_ignore_inhibit = "org.freedesktop.login1.reboot-ignore-inhibit";
+        } else if (streq(type, "halt")) {
+                action = "org.freedesktop.login1.halt";
+                action_multiple_sessions = "org.freedesktop.login1.halt-multiple-sessions";
+                action_ignore_inhibit = "org.freedesktop.login1.halt-ignore-inhibit";
+        } else if (streq(type, "poweroff")) {
+                action = "org.freedesktop.login1.poweroff";
+                action_multiple_sessions = "org.freedesktop.login1.poweroff-multiple-sessions";
+                action_ignore_inhibit = "org.freedesktop.login1.poweroff-ignore-inhibit";
+        } else
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unsupported shutdown type");
+
+        r = verify_shutdown_creds(m, message, INHIBIT_SHUTDOWN, false,
+                                  action, action_multiple_sessions, action_ignore_inhibit, error);
+        if (r != 0)
+                return r;
+
+        if (m->scheduled_shutdown_timeout_source) {
+                r = sd_event_source_set_time(m->scheduled_shutdown_timeout_source, elapse);
+                if (r < 0)
+                        return log_error_errno(r, "sd_event_source_set_time() failed: %m\n");
+
+                r = sd_event_source_set_enabled(m->scheduled_shutdown_timeout_source, SD_EVENT_ONESHOT);
+                if (r < 0)
+                        return log_error_errno(r, "sd_event_source_set_enabled() failed: %m\n");
+        } else {
+                r = sd_event_add_time(m->event, &m->scheduled_shutdown_timeout_source,
+                                      CLOCK_REALTIME, elapse, 0, manager_scheduled_shutdown_handler, m);
+                if (r < 0)
+                        return log_error_errno(r, "sd_event_add_time() failed: %m\n");
+        }
+
+        r = free_and_strdup(&m->scheduled_shutdown_type, type);
+        if (r < 0) {
+                m->scheduled_shutdown_timeout_source = sd_event_source_unref(m->scheduled_shutdown_timeout_source);
+                return log_oom();
+        }
+
+        m->scheduled_shutdown_timeout = elapse;
+
+        return sd_bus_reply_method_return(message, NULL);
+}
+
+static int method_cancel_scheduled_shutdown(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+        bool cancelled;
+
+        assert(m);
+        assert(message);
+
+        cancelled = m->scheduled_shutdown_type != NULL;
+
+        m->scheduled_shutdown_timeout_source = sd_event_source_unref(m->scheduled_shutdown_timeout_source);
+        free(m->scheduled_shutdown_type);
+        m->scheduled_shutdown_type = NULL;
+        m->scheduled_shutdown_timeout = 0;
+
+        return sd_bus_reply_method_return(message, "b", cancelled);
+}
+
 static int method_hibernate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
 
@@ -2161,6 +2296,7 @@ const sd_bus_vtable manager_vtable[] = {
         SD_BUS_PROPERTY("IdleActionUSec", "t", NULL, offsetof(Manager, idle_action_usec), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("PreparingForShutdown", "b", property_get_preparing, 0, 0),
         SD_BUS_PROPERTY("PreparingForSleep", "b", property_get_preparing, 0, 0),
+        SD_BUS_PROPERTY("ScheduledShutdown", "(st)", property_get_scheduled_shutdown, 0, 0),
 
         SD_BUS_METHOD("GetSession", "s", "o", method_get_session, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("GetSessionByPID", "u", "o", method_get_session_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
@@ -2190,6 +2326,8 @@ const sd_bus_vtable manager_vtable[] = {
         SD_BUS_METHOD("PowerOff", "b", NULL, method_poweroff, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("Reboot", "b", NULL, method_reboot, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("Suspend", "b", NULL, method_suspend, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("ScheduleShutdown", "st", NULL, method_schedule_shutdown, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("CancelScheduledShutdown", NULL, "b", method_cancel_scheduled_shutdown, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("Hibernate", "b", NULL, method_hibernate, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("HybridSleep", "b", NULL, method_hybrid_sleep, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("CanPowerOff", NULL, "s", method_can_poweroff, SD_BUS_VTABLE_UNPRIVILEGED),
diff --git a/src/login/logind.c b/src/login/logind.c
index d8163ecf91..3a4afdd266 100644
--- a/src/login/logind.c
+++ b/src/login/logind.c
@@ -144,6 +144,7 @@ static void manager_free(Manager *m) {
 
         sd_event_source_unref(m->idle_action_event_source);
         sd_event_source_unref(m->inhibit_timeout_source);
+        sd_event_source_unref(m->scheduled_shutdown_timeout_source);
 
         sd_event_source_unref(m->console_active_event_source);
         sd_event_source_unref(m->udev_seat_event_source);
@@ -176,6 +177,7 @@ static void manager_free(Manager *m) {
         strv_free(m->kill_only_users);
         strv_free(m->kill_exclude_users);
 
+        free(m->scheduled_shutdown_type);
         free(m->action_job);
         free(m);
 }
diff --git a/src/login/logind.h b/src/login/logind.h
index 2cb19caeea..cd2bdc05d2 100644
--- a/src/login/logind.h
+++ b/src/login/logind.h
@@ -97,6 +97,10 @@ struct Manager {
         char *action_job;
         sd_event_source *inhibit_timeout_source;
 
+        char *scheduled_shutdown_type;
+        usec_t scheduled_shutdown_timeout;
+        sd_event_source *scheduled_shutdown_timeout_source;
+
         sd_event_source *idle_action_event_source;
         usec_t idle_action_usec;
         usec_t idle_action_not_before_usec;