core: add support for a configurable system-wide start-up timeout

When this system-wide start-up timeout is hit we execute one of the
failure actions already implemented for services that fail.

This should not only be useful on embedded devices, but also on laptops
which have the power-button reachable when the lid is closed. This
devices, when in a backpack might get powered on by accident due to the
easily reachable power button. We want to make sure that the system
turns itself off if it starts up due this after a while.

When the system manages to fully start-up logind will suspend the
machine by default if the lid is closed. However, in some cases we don't
even get as far as logind, and the boot hangs much earlier, for example
because we ask for a LUKS password that nobody ever enters.

Yeah, this is a real-life problem on my Yoga 13, which has one of those
easily accessible power buttons, even if the device is closed.

1 files changed, 94 insertions, 0 deletions

diff --git a/src/core/failure-action.c b/src/core/failure-action.c
new file mode 100644
index 0000000000..ca807b68da
--- /dev/null
+++ b/src/core/failure-action.c
@@ -0,0 +1,94 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+  Copyright 2012 Michael Olbrich
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/reboot.h>
+#include <linux/reboot.h>
+#include <sys/syscall.h>
+
+#include "bus-util.h"
+#include "bus-error.h"
+#include "special.h"
+#include "failure-action.h"
+
+int failure_action(
+                Manager *m,
+                FailureAction action,
+                const char *reboot_arg) {
+
+        int r;
+
+        assert(m);
+        assert(action >= 0);
+        assert(action < _FAILURE_ACTION_MAX);
+
+        switch (action) {
+
+        case FAILURE_ACTION_NONE:
+                break;
+
+        case FAILURE_ACTION_REBOOT: {
+                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+                log_warning("Rebooting as result of failure.");
+
+                update_reboot_param_file(reboot_arg);
+                r = manager_add_job_by_name(m, JOB_START, SPECIAL_REBOOT_TARGET, JOB_REPLACE, true, &error, NULL);
+                if (r < 0)
+                        log_error("Failed to reboot: %s.", bus_error_message(&error, r));
+
+                break;
+        }
+
+        case FAILURE_ACTION_REBOOT_FORCE:
+                log_warning("Forcibly rebooting as result of failure.");
+                update_reboot_param_file(reboot_arg);
+                m->exit_code = MANAGER_REBOOT;
+                break;
+
+        case FAILURE_ACTION_REBOOT_IMMEDIATE:
+                log_warning("Rebooting immediately as result of failure.");
+
+                sync();
+
+                if (reboot_arg) {
+                        log_info("Rebooting with argument '%s'.", reboot_arg);
+                        syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, reboot_arg);
+                }
+
+                log_info("Rebooting.");
+                reboot(RB_AUTOBOOT);
+                break;
+
+        default:
+                assert_not_reached("Unknown failure action");
+        }
+
+        return -ECANCELED;
+}
+
+static const char* const failure_action_table[_FAILURE_ACTION_MAX] = {
+        [FAILURE_ACTION_NONE] = "none",
+        [FAILURE_ACTION_REBOOT] = "reboot",
+        [FAILURE_ACTION_REBOOT_FORCE] = "reboot-force",
+        [FAILURE_ACTION_REBOOT_IMMEDIATE] = "reboot-immediate"
+};
+DEFINE_STRING_TABLE_LOOKUP(failure_action, FailureAction);