[systemd.git] / src / core / shutdown.c

/***
  This file is part of systemd.

  Copyright 2010 ProFUSION embedded systems

  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 <errno.h>
#include <getopt.h>
#include <linux/reboot.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include <sys/stat.h>
#include <unistd.h>

#include "alloc-util.h"
#include "cgroup-util.h"
#include "def.h"
#include "fileio.h"
#include "killall.h"
#include "log.h"
#include "missing.h"
#include "parse-util.h"
#include "process-util.h"
#include "string-util.h"
#include "switch-root.h"
#include "terminal-util.h"
#include "umount.h"
#include "util.h"
#include "virt.h"
#include "watchdog.h"

#define FINALIZE_ATTEMPTS 50

static char* arg_verb;
static uint8_t arg_exit_code;

static int parse_argv(int argc, char *argv[]) {
        enum {
                ARG_LOG_LEVEL = 0x100,
                ARG_LOG_TARGET,
                ARG_LOG_COLOR,
                ARG_LOG_LOCATION,
                ARG_EXIT_CODE,
        };

        static const struct option options[] = {
                { "log-level",     required_argument, NULL, ARG_LOG_LEVEL    },
                { "log-target",    required_argument, NULL, ARG_LOG_TARGET   },
                { "log-color",     optional_argument, NULL, ARG_LOG_COLOR    },
                { "log-location",  optional_argument, NULL, ARG_LOG_LOCATION },
                { "exit-code",     required_argument, NULL, ARG_EXIT_CODE    },
                {}
        };

        int c, r;

        assert(argc >= 1);
        assert(argv);

        /* "-" prevents getopt from permuting argv[] and moving the verb away
         * from argv[1]. Our interface to initrd promises it'll be there. */
        while ((c = getopt_long(argc, argv, "-", options, NULL)) >= 0)
                switch (c) {

                case ARG_LOG_LEVEL:
                        r = log_set_max_level_from_string(optarg);
                        if (r < 0)
                                log_error("Failed to parse log level %s, ignoring.", optarg);

                        break;

                case ARG_LOG_TARGET:
                        r = log_set_target_from_string(optarg);
                        if (r < 0)
                                log_error("Failed to parse log target %s, ignoring", optarg);

                        break;

                case ARG_LOG_COLOR:

                        if (optarg) {
                                r = log_show_color_from_string(optarg);
                                if (r < 0)
                                        log_error("Failed to parse log color setting %s, ignoring", optarg);
                        } else
                                log_show_color(true);

                        break;

                case ARG_LOG_LOCATION:
                        if (optarg) {
                                r = log_show_location_from_string(optarg);
                                if (r < 0)
                                        log_error("Failed to parse log location setting %s, ignoring", optarg);
                        } else
                                log_show_location(true);

                        break;

                case ARG_EXIT_CODE:
                        r = safe_atou8(optarg, &arg_exit_code);
                        if (r < 0)
                                log_error("Failed to parse exit code %s, ignoring", optarg);

                        break;

                case '\001':
                        if (!arg_verb)
                                arg_verb = optarg;
                        else
                                log_error("Excess arguments, ignoring");
                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached("Unhandled option code.");
                }

        if (!arg_verb) {
                log_error("Verb argument missing.");
                return -EINVAL;
        }

        return 0;
}

static int switch_root_initramfs(void) {
        if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0)
                return log_error_errno(errno, "Failed to mount bind /run/initramfs on /run/initramfs: %m");

        if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0)
                return log_error_errno(errno, "Failed to make /run/initramfs private mount: %m");

        /* switch_root with MS_BIND, because there might still be processes lurking around, which have open file descriptors.
         * /run/initramfs/shutdown will take care of these.
         * Also do not detach the old root, because /run/initramfs/shutdown needs to access it.
         */
        return switch_root("/run/initramfs", "/oldroot", false, MS_BIND);
}


int main(int argc, char *argv[]) {
        bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
        bool in_container, use_watchdog = false;
        _cleanup_free_ char *cgroup = NULL;
        char *arguments[3];
        unsigned retries;
        int cmd, r;
        static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL};

        log_parse_environment();
        r = parse_argv(argc, argv);
        if (r < 0)
                goto error;

        /* journald will die if not gone yet. The log target defaults
         * to console, but may have been changed by command line options. */

        log_close_console(); /* force reopen of /dev/console */
        log_open();

        umask(0022);

        if (getpid() != 1) {
                log_error("Not executed by init (PID 1).");
                r = -EPERM;
                goto error;
        }

        if (streq(arg_verb, "reboot"))
                cmd = RB_AUTOBOOT;
        else if (streq(arg_verb, "poweroff"))
                cmd = RB_POWER_OFF;
        else if (streq(arg_verb, "halt"))
                cmd = RB_HALT_SYSTEM;
        else if (streq(arg_verb, "kexec"))
                cmd = LINUX_REBOOT_CMD_KEXEC;
        else if (streq(arg_verb, "exit"))
                cmd = 0; /* ignored, just checking that arg_verb is valid */
        else {
                r = -EINVAL;
                log_error("Unknown action '%s'.", arg_verb);
                goto error;
        }

        cg_get_root_path(&cgroup);

        use_watchdog = !!getenv("WATCHDOG_USEC");

        /* lock us into memory */
        mlockall(MCL_CURRENT|MCL_FUTURE);

        log_info("Sending SIGTERM to remaining processes...");
        broadcast_signal(SIGTERM, true, true);

        log_info("Sending SIGKILL to remaining processes...");
        broadcast_signal(SIGKILL, true, false);

        in_container = detect_container() > 0;

        need_umount = !in_container;
        need_swapoff = !in_container;
        need_loop_detach = !in_container;
        need_dm_detach = !in_container;

        /* Unmount all mountpoints, swaps, and loopback devices */
        for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
                bool changed = false;

                if (use_watchdog)
                        watchdog_ping();

                /* Let's trim the cgroup tree on each iteration so
                   that we leave an empty cgroup tree around, so that
                   container managers get a nice notify event when we
                   are down */
                if (cgroup)
                        cg_trim(SYSTEMD_CGROUP_CONTROLLER, cgroup, false);

                if (need_umount) {
                        log_info("Unmounting file systems.");
                        r = umount_all(&changed);
                        if (r == 0) {
                                need_umount = false;
                                log_info("All filesystems unmounted.");
                        } else if (r > 0)
                                log_info("Not all file systems unmounted, %d left.", r);
                        else
                                log_error_errno(r, "Failed to unmount file systems: %m");
                }

                if (need_swapoff) {
                        log_info("Deactivating swaps.");
                        r = swapoff_all(&changed);
                        if (r == 0) {
                                need_swapoff = false;
                                log_info("All swaps deactivated.");
                        } else if (r > 0)
                                log_info("Not all swaps deactivated, %d left.", r);
                        else
                                log_error_errno(r, "Failed to deactivate swaps: %m");
                }

                if (need_loop_detach) {
                        log_info("Detaching loop devices.");
                        r = loopback_detach_all(&changed);
                        if (r == 0) {
                                need_loop_detach = false;
                                log_info("All loop devices detached.");
                        } else if (r > 0)
                                log_info("Not all loop devices detached, %d left.", r);
                        else
                                log_error_errno(r, "Failed to detach loop devices: %m");
                }

                if (need_dm_detach) {
                        log_info("Detaching DM devices.");
                        r = dm_detach_all(&changed);
                        if (r == 0) {
                                need_dm_detach = false;
                                log_info("All DM devices detached.");
                        } else if (r > 0)
                                log_info("Not all DM devices detached, %d left.", r);
                        else
                                log_error_errno(r, "Failed to detach DM devices: %m");
                }

                if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) {
                        if (retries > 0)
                                log_info("All filesystems, swaps, loop devices, DM devices detached.");
                        /* Yay, done */
                        goto initrd_jump;
                }

                /* If in this iteration we didn't manage to
                 * unmount/deactivate anything, we simply give up */
                if (!changed) {
                        log_info("Cannot finalize remaining%s%s%s%s continuing.",
                                 need_umount ? " file systems," : "",
                                 need_swapoff ? " swap devices," : "",
                                 need_loop_detach ? " loop devices," : "",
                                 need_dm_detach ? " DM devices," : "");
                        goto initrd_jump;
                }

                log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.",
                          retries + 1,
                          need_umount ? " file systems," : "",
                          need_swapoff ? " swap devices," : "",
                          need_loop_detach ? " loop devices," : "",
                          need_dm_detach ? " DM devices," : "");
        }

        log_error("Too many iterations, giving up.");

 initrd_jump:

        arguments[0] = NULL;
        arguments[1] = arg_verb;
        arguments[2] = NULL;
        execute_directories(dirs, DEFAULT_TIMEOUT_USEC, arguments);

        if (!in_container && !in_initrd() &&
            access("/run/initramfs/shutdown", X_OK) == 0) {
                r = switch_root_initramfs();
                if (r >= 0) {
                        argv[0] = (char*) "/shutdown";

                        setsid();
                        make_console_stdio();

                        log_info("Successfully changed into root pivot.\n"
                                 "Returning to initrd...");

                        execv("/shutdown", argv);
                        log_error_errno(errno, "Failed to execute shutdown binary: %m");
                } else
                        log_error_errno(r, "Failed to switch root to \"/run/initramfs\": %m");

        }

        if (need_umount || need_swapoff || need_loop_detach || need_dm_detach)
                log_error("Failed to finalize %s%s%s%s ignoring",
                          need_umount ? " file systems," : "",
                          need_swapoff ? " swap devices," : "",
                          need_loop_detach ? " loop devices," : "",
                          need_dm_detach ? " DM devices," : "");

        /* The kernel will automaticall flush ATA disks and suchlike
         * on reboot(), but the file systems need to be synce'd
         * explicitly in advance. So let's do this here, but not
         * needlessly slow down containers. */
        if (!in_container)
                sync();

        if (streq(arg_verb, "exit")) {
                if (in_container)
                        exit(arg_exit_code);
                else {
                        /* We cannot exit() on the host, fallback on another
                         * method. */
                        cmd = RB_POWER_OFF;
                }
        }

        switch (cmd) {

        case LINUX_REBOOT_CMD_KEXEC:

                if (!in_container) {
                        /* We cheat and exec kexec to avoid doing all its work */
                        pid_t pid;

                        log_info("Rebooting with kexec.");

                        pid = fork();
                        if (pid < 0)
                                log_error_errno(errno, "Failed to fork: %m");
                        else if (pid == 0) {

                                const char * const args[] = {
                                        KEXEC, "-e", NULL
                                };

                                /* Child */

                                execv(args[0], (char * const *) args);
                                _exit(EXIT_FAILURE);
                        } else
                                wait_for_terminate_and_warn("kexec", pid, true);
                }

                cmd = RB_AUTOBOOT;
                /* Fall through */

        case RB_AUTOBOOT:

                if (!in_container) {
                        _cleanup_free_ char *param = NULL;

                        if (read_one_line_file(REBOOT_PARAM_FILE, &param) >= 0) {
                                log_info("Rebooting with argument '%s'.", param);
                                syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param);
                        }
                }

                log_info("Rebooting.");
                break;

        case RB_POWER_OFF:
                log_info("Powering off.");
                break;

        case RB_HALT_SYSTEM:
                log_info("Halting system.");
                break;

        default:
                assert_not_reached("Unknown magic");
        }

        reboot(cmd);
        if (errno == EPERM && in_container) {
                /* If we are in a container, and we lacked
                 * CAP_SYS_BOOT just exit, this will kill our
                 * container for good. */
                log_info("Exiting container.");
                exit(0);
        }

        r = log_error_errno(errno, "Failed to invoke reboot(): %m");

  error:
        log_emergency_errno(r, "Critical error while doing system shutdown: %m");
        freeze();
}
Commit	Line	Data
663996b3 MS	1	/***
	2	This file is part of systemd.
	3
	4	Copyright 2010 ProFUSION embedded systems
	5
	6	systemd is free software; you can redistribute it and/or modify it
	7	under the terms of the GNU Lesser General Public License as published by
	8	the Free Software Foundation; either version 2.1 of the License, or
	9	(at your option) any later version.
	10
	11	systemd is distributed in the hope that it will be useful, but
	12	WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public License
	17	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	18	***/
	19
663996b3	20	#include <errno.h>
db2df898 MP	21	#include <getopt.h>
db2df898 MP	22	#include <linux/reboot.h>
663996b3 MS	23	#include <signal.h>
	24	#include <stdbool.h>
	25	#include <stdlib.h>
db2df898 MP	26	#include <sys/mman.h>
	27	#include <sys/mount.h>
	28	#include <sys/reboot.h>
	29	#include <sys/stat.h>
	30	#include <unistd.h>
663996b3	31
db2df898 MP	32	#include "alloc-util.h"
	33	#include "cgroup-util.h"
	34	#include "def.h"
14228c0d	35	#include "fileio.h"
db2df898 MP	36	#include "killall.h"
	37	#include "log.h"
	38	#include "missing.h"
	39	#include "parse-util.h"
	40	#include "process-util.h"
	41	#include "string-util.h"
	42	#include "switch-root.h"
	43	#include "terminal-util.h"
663996b3 MS	44	#include "umount.h"
663996b3 MS	45	#include "util.h"
663996b3 MS	46	#include "virt.h"
663996b3 MS	47	#include "watchdog.h"
663996b3 MS	48
	49	#define FINALIZE_ATTEMPTS 50
	50
60f067b4	51	static char* arg_verb;
6300502b	52	static uint8_t arg_exit_code;
60f067b4 JS	53
	54	static int parse_argv(int argc, char *argv[]) {
	55	enum {
	56	ARG_LOG_LEVEL = 0x100,
	57	ARG_LOG_TARGET,
	58	ARG_LOG_COLOR,
	59	ARG_LOG_LOCATION,
6300502b	60	ARG_EXIT_CODE,
60f067b4 JS	61	};
	62
	63	static const struct option options[] = {
	64	{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },
	65	{ "log-target", required_argument, NULL, ARG_LOG_TARGET },
	66	{ "log-color", optional_argument, NULL, ARG_LOG_COLOR },
	67	{ "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
6300502b	68	{ "exit-code", required_argument, NULL, ARG_EXIT_CODE },
60f067b4 JS	69	{}
	70	};
	71
	72	int c, r;
	73
	74	assert(argc >= 1);
	75	assert(argv);
	76
f47781d8 MP	77	/* "-" prevents getopt from permuting argv[] and moving the verb away
	78	* from argv[1]. Our interface to initrd promises it'll be there. */
	79	while ((c = getopt_long(argc, argv, "-", options, NULL)) >= 0)
60f067b4 JS	80	switch (c) {
	81
	82	case ARG_LOG_LEVEL:
	83	r = log_set_max_level_from_string(optarg);
	84	if (r < 0)
	85	log_error("Failed to parse log level %s, ignoring.", optarg);
	86
	87	break;
	88
	89	case ARG_LOG_TARGET:
	90	r = log_set_target_from_string(optarg);
	91	if (r < 0)
	92	log_error("Failed to parse log target %s, ignoring", optarg);
	93
	94	break;
	95
	96	case ARG_LOG_COLOR:
	97
	98	if (optarg) {
	99	r = log_show_color_from_string(optarg);
	100	if (r < 0)
	101	log_error("Failed to parse log color setting %s, ignoring", optarg);
	102	} else
	103	log_show_color(true);
	104
	105	break;
	106
	107	case ARG_LOG_LOCATION:
	108	if (optarg) {
	109	r = log_show_location_from_string(optarg);
	110	if (r < 0)
	111	log_error("Failed to parse log location setting %s, ignoring", optarg);
	112	} else
	113	log_show_location(true);
	114
	115	break;
	116
6300502b MP	117	case ARG_EXIT_CODE:
	118	r = safe_atou8(optarg, &arg_exit_code);
	119	if (r < 0)
	120	log_error("Failed to parse exit code %s, ignoring", optarg);
	121
	122	break;
	123
f47781d8 MP	124	case '\001':
	125	if (!arg_verb)
	126	arg_verb = optarg;
	127	else
	128	log_error("Excess arguments, ignoring");
	129	break;
	130
60f067b4	131	case '?':
60f067b4 JS	132	return -EINVAL;
	133
	134	default:
	135	assert_not_reached("Unhandled option code.");
	136	}
	137
f47781d8	138	if (!arg_verb) {
60f067b4 JS	139	log_error("Verb argument missing.");
	140	return -EINVAL;
	141	}
	142
60f067b4 JS	143	return 0;
	144	}
	145
5eef597e	146	static int switch_root_initramfs(void) {
f47781d8 MP	147	if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0)
f47781d8 MP	148	return log_error_errno(errno, "Failed to mount bind /run/initramfs on /run/initramfs: %m");
663996b3	149
f47781d8 MP	150	if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0)
f47781d8 MP	151	return log_error_errno(errno, "Failed to make /run/initramfs private mount: %m");
663996b3	152
e735f4d4	153	/* switch_root with MS_BIND, because there might still be processes lurking around, which have open file descriptors.
5eef597e MP	154	* /run/initramfs/shutdown will take care of these.
	155	* Also do not detach the old root, because /run/initramfs/shutdown needs to access it.
	156	*/
	157	return switch_root("/run/initramfs", "/oldroot", false, MS_BIND);
663996b3 MS	158	}
663996b3 MS	159
663996b3 MS	160
663996b3 MS	161	int main(int argc, char *argv[]) {
e842803a	162	bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
663996b3	163	bool in_container, use_watchdog = false;
60f067b4	164	_cleanup_free_ char *cgroup = NULL;
663996b3	165	char *arguments[3];
60f067b4 JS	166	unsigned retries;
60f067b4 JS	167	int cmd, r;
e735f4d4	168	static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL};
663996b3	169
60f067b4 JS	170	log_parse_environment();
	171	r = parse_argv(argc, argv);
	172	if (r < 0)
	173	goto error;
14228c0d	174
60f067b4	175	/* journald will die if not gone yet. The log target defaults
f47781d8	176	* to console, but may have been changed by command line options. */
14228c0d	177
60f067b4	178	log_close_console(); /* force reopen of /dev/console */
663996b3 MS	179	log_open();
	180
	181	umask(0022);
	182
	183	if (getpid() != 1) {
60f067b4	184	log_error("Not executed by init (PID 1).");
663996b3 MS	185	r = -EPERM;
	186	goto error;
	187	}
	188
60f067b4	189	if (streq(arg_verb, "reboot"))
663996b3	190	cmd = RB_AUTOBOOT;
60f067b4	191	else if (streq(arg_verb, "poweroff"))
663996b3	192	cmd = RB_POWER_OFF;
60f067b4	193	else if (streq(arg_verb, "halt"))
663996b3	194	cmd = RB_HALT_SYSTEM;
60f067b4	195	else if (streq(arg_verb, "kexec"))
663996b3	196	cmd = LINUX_REBOOT_CMD_KEXEC;
6300502b MP	197	else if (streq(arg_verb, "exit"))
6300502b MP	198	cmd = 0; /* ignored, just checking that arg_verb is valid */
663996b3	199	else {
663996b3	200	r = -EINVAL;
60f067b4	201	log_error("Unknown action '%s'.", arg_verb);
663996b3 MS	202	goto error;
	203	}
	204
60f067b4 JS	205	cg_get_root_path(&cgroup);
60f067b4 JS	206
663996b3 MS	207	use_watchdog = !!getenv("WATCHDOG_USEC");
	208
	209	/* lock us into memory */
	210	mlockall(MCL_CURRENT\|MCL_FUTURE);
	211
	212	log_info("Sending SIGTERM to remaining processes...");
60f067b4	213	broadcast_signal(SIGTERM, true, true);
663996b3 MS	214
663996b3 MS	215	log_info("Sending SIGKILL to remaining processes...");
60f067b4	216	broadcast_signal(SIGKILL, true, false);
663996b3	217
6300502b	218	in_container = detect_container() > 0;
e842803a	219
5eef597e	220	need_umount = !in_container;
e842803a MB	221	need_swapoff = !in_container;
	222	need_loop_detach = !in_container;
	223	need_dm_detach = !in_container;
663996b3 MS	224
	225	/* Unmount all mountpoints, swaps, and loopback devices */
	226	for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
	227	bool changed = false;
	228
	229	if (use_watchdog)
	230	watchdog_ping();
	231
60f067b4 JS	232	/* Let's trim the cgroup tree on each iteration so
	233	that we leave an empty cgroup tree around, so that
	234	container managers get a nice notify event when we
	235	are down */
	236	if (cgroup)
	237	cg_trim(SYSTEMD_CGROUP_CONTROLLER, cgroup, false);
	238
663996b3 MS	239	if (need_umount) {
	240	log_info("Unmounting file systems.");
	241	r = umount_all(&changed);
	242	if (r == 0) {
	243	need_umount = false;
	244	log_info("All filesystems unmounted.");
	245	} else if (r > 0)
	246	log_info("Not all file systems unmounted, %d left.", r);
	247	else
f47781d8	248	log_error_errno(r, "Failed to unmount file systems: %m");
663996b3 MS	249	}
	250
	251	if (need_swapoff) {
	252	log_info("Deactivating swaps.");
	253	r = swapoff_all(&changed);
	254	if (r == 0) {
	255	need_swapoff = false;
	256	log_info("All swaps deactivated.");
	257	} else if (r > 0)
	258	log_info("Not all swaps deactivated, %d left.", r);
	259	else
f47781d8	260	log_error_errno(r, "Failed to deactivate swaps: %m");
663996b3 MS	261	}
	262
	263	if (need_loop_detach) {
	264	log_info("Detaching loop devices.");
	265	r = loopback_detach_all(&changed);
	266	if (r == 0) {
	267	need_loop_detach = false;
	268	log_info("All loop devices detached.");
	269	} else if (r > 0)
	270	log_info("Not all loop devices detached, %d left.", r);
	271	else
f47781d8	272	log_error_errno(r, "Failed to detach loop devices: %m");
663996b3 MS	273	}
	274
	275	if (need_dm_detach) {
	276	log_info("Detaching DM devices.");
	277	r = dm_detach_all(&changed);
	278	if (r == 0) {
	279	need_dm_detach = false;
	280	log_info("All DM devices detached.");
	281	} else if (r > 0)
	282	log_info("Not all DM devices detached, %d left.", r);
	283	else
f47781d8	284	log_error_errno(r, "Failed to detach DM devices: %m");
663996b3 MS	285	}
	286
	287	if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) {
	288	if (retries > 0)
	289	log_info("All filesystems, swaps, loop devices, DM devices detached.");
	290	/* Yay, done */
e842803a	291	goto initrd_jump;
663996b3 MS	292	}
	293
	294	/* If in this iteration we didn't manage to
	295	* unmount/deactivate anything, we simply give up */
	296	if (!changed) {
e842803a MB	297	log_info("Cannot finalize remaining%s%s%s%s continuing.",
	298	need_umount ? " file systems," : "",
	299	need_swapoff ? " swap devices," : "",
	300	need_loop_detach ? " loop devices," : "",
	301	need_dm_detach ? " DM devices," : "");
	302	goto initrd_jump;
663996b3 MS	303	}
663996b3 MS	304
e842803a MB	305	log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.",
	306	retries + 1,
	307	need_umount ? " file systems," : "",
	308	need_swapoff ? " swap devices," : "",
	309	need_loop_detach ? " loop devices," : "",
	310	need_dm_detach ? " DM devices," : "");
663996b3 MS	311	}
663996b3 MS	312
e842803a MB	313	log_error("Too many iterations, giving up.");
	314
	315	initrd_jump:
663996b3 MS	316
663996b3 MS	317	arguments[0] = NULL;
60f067b4	318	arguments[1] = arg_verb;
663996b3	319	arguments[2] = NULL;
e735f4d4	320	execute_directories(dirs, DEFAULT_TIMEOUT_USEC, arguments);
663996b3 MS	321
	322	if (!in_container && !in_initrd() &&
	323	access("/run/initramfs/shutdown", X_OK) == 0) {
5eef597e MP	324	r = switch_root_initramfs();
	325	if (r >= 0) {
	326	argv[0] = (char*) "/shutdown";
663996b3	327
5eef597e MP	328	setsid();
5eef597e MP	329	make_console_stdio();
663996b3	330
5eef597e MP	331	log_info("Successfully changed into root pivot.\n"
5eef597e MP	332	"Returning to initrd...");
663996b3	333
5eef597e	334	execv("/shutdown", argv);
f47781d8	335	log_error_errno(errno, "Failed to execute shutdown binary: %m");
5eef597e	336	} else
f47781d8	337	log_error_errno(r, "Failed to switch root to \"/run/initramfs\": %m");
5eef597e	338
663996b3 MS	339	}
663996b3 MS	340
e842803a MB	341	if (need_umount \|\| need_swapoff \|\| need_loop_detach \|\| need_dm_detach)
	342	log_error("Failed to finalize %s%s%s%s ignoring",
	343	need_umount ? " file systems," : "",
	344	need_swapoff ? " swap devices," : "",
	345	need_loop_detach ? " loop devices," : "",
	346	need_dm_detach ? " DM devices," : "");
	347
663996b3 MS	348	/* The kernel will automaticall flush ATA disks and suchlike
	349	* on reboot(), but the file systems need to be synce'd
	350	* explicitly in advance. So let's do this here, but not
	351	* needlessly slow down containers. */
	352	if (!in_container)
	353	sync();
	354
6300502b MP	355	if (streq(arg_verb, "exit")) {
	356	if (in_container)
	357	exit(arg_exit_code);
	358	else {
	359	/* We cannot exit() on the host, fallback on another
	360	* method. */
	361	cmd = RB_POWER_OFF;
	362	}
	363	}
	364
60f067b4 JS	365	switch (cmd) {
	366
	367	case LINUX_REBOOT_CMD_KEXEC:
663996b3 MS	368
	369	if (!in_container) {
	370	/* We cheat and exec kexec to avoid doing all its work */
60f067b4	371	pid_t pid;
663996b3	372
60f067b4 JS	373	log_info("Rebooting with kexec.");
	374
	375	pid = fork();
663996b3	376	if (pid < 0)
f47781d8	377	log_error_errno(errno, "Failed to fork: %m");
60f067b4 JS	378	else if (pid == 0) {
	379
	380	const char * const args[] = {
	381	KEXEC, "-e", NULL
	382	};
	383
663996b3	384	/* Child */
60f067b4	385
663996b3	386	execv(args[0], (char * const *) args);
60f067b4 JS	387	_exit(EXIT_FAILURE);
60f067b4 JS	388	} else
f47781d8	389	wait_for_terminate_and_warn("kexec", pid, true);
663996b3 MS	390	}
	391
	392	cmd = RB_AUTOBOOT;
60f067b4 JS	393	/* Fall through */
	394
	395	case RB_AUTOBOOT:
	396
	397	if (!in_container) {
	398	_cleanup_free_ char *param = NULL;
	399
	400	if (read_one_line_file(REBOOT_PARAM_FILE, &param) >= 0) {
	401	log_info("Rebooting with argument '%s'.", param);
5eef597e	402	syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param);
60f067b4 JS	403	}
	404	}
	405
	406	log_info("Rebooting.");
	407	break;
	408
	409	case RB_POWER_OFF:
	410	log_info("Powering off.");
	411	break;
	412
	413	case RB_HALT_SYSTEM:
	414	log_info("Halting system.");
	415	break;
	416
	417	default:
	418	assert_not_reached("Unknown magic");
663996b3 MS	419	}
	420
	421	reboot(cmd);
663996b3 MS	422	if (errno == EPERM && in_container) {
	423	/* If we are in a container, and we lacked
	424	* CAP_SYS_BOOT just exit, this will kill our
	425	* container for good. */
60f067b4	426	log_info("Exiting container.");
663996b3 MS	427	exit(0);
	428	}
	429
6300502b	430	r = log_error_errno(errno, "Failed to invoke reboot(): %m");
663996b3 MS	431
663996b3 MS	432	error:
f47781d8	433	log_emergency_errno(r, "Critical error while doing system shutdown: %m");
663996b3	434	freeze();
663996b3	435	}