Beispiel #1
0
int main(int argc, char *argv[]) {
        int cmd, r;
        unsigned retries;
        bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
        bool in_container, use_watchdog = false;
        char *arguments[3];

        log_parse_environment();
        log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
        log_open();

        umask(0022);

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

        if (argc != 2) {
                log_error("Invalid number of arguments.");
                r = -EINVAL;
                goto error;
        }

        in_container = detect_container(NULL) > 0;

        if (streq(argv[1], "reboot"))
                cmd = RB_AUTOBOOT;
        else if (streq(argv[1], "poweroff"))
                cmd = RB_POWER_OFF;
        else if (streq(argv[1], "halt"))
                cmd = RB_HALT_SYSTEM;
        else if (streq(argv[1], "kexec"))
                cmd = LINUX_REBOOT_CMD_KEXEC;
        else {
                log_error("Unknown action '%s'.", argv[1]);
                r = -EINVAL;
                goto error;
        }

        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);

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

        if (in_container) {
                need_swapoff = false;
                need_dm_detach = false;
                need_loop_detach = false;
        }

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

                if (use_watchdog)
                        watchdog_ping();

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

                if (need_swapoff) {
                        log_info("Disabling swaps.");
                        r = swapoff_all(&changed);
                        if (r == 0)
                                need_swapoff = false;
                        else if (r > 0)
                                log_info("Not all swaps are turned off, %d left.", r);
                        else
                                log_error("Failed to turn off swaps: %s", strerror(-r));
                }

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

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

                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 */
                        break;
                }

                /* If in this iteration we didn't manage to
                 * unmount/deactivate anything, we simply give up */
                if (!changed) {
                        log_error("Cannot finalize remaining file systems and devices, giving up.");
                        break;
                }

                log_debug("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1);
        }

        if (retries >= FINALIZE_ATTEMPTS)
                log_error("Too many iterations, giving up.");

        arguments[0] = NULL;
        arguments[1] = argv[1];
        arguments[2] = NULL;
        execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, arguments);

        if (!in_container &&
            access("/run/initramfs/shutdown", X_OK) == 0) {

                if (prepare_new_root() >= 0 &&
                    pivot_to_new_root() >= 0) {
                        execv("/shutdown", argv);
                        log_error("Failed to execute shutdown binary: %m");
                }
        }

        if (cmd == LINUX_REBOOT_CMD_KEXEC) {

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

                        if (pid < 0)
                                log_error("Could not fork: %m. Falling back to normal reboot.");
                        else if (pid > 0) {
                                wait_for_terminate_and_warn("kexec", pid);
                                log_warning("kexec failed. Falling back to normal reboot.");
                        } else {
                                /* Child */
                                const char *args[3] = { "/sbin/kexec", "-e", NULL };
                                execv(args[0], (char * const *) args);
                                return EXIT_FAILURE;
                        }
                }

                cmd = RB_AUTOBOOT;
        }

        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_error("Exiting container.");
                exit(0);
        }

        log_error("Failed to invoke reboot(): %m");
        r = -errno;

  error:
        log_error("Critical error while doing system shutdown: %s", strerror(-r));

        freeze();
        return EXIT_FAILURE;
}
Beispiel #2
0
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();
}
Beispiel #3
0
int
this_was_main_int_mount_c (int argc, char *argv[])
{
  int c;
  int all = 0;
  string_list types = NULL;
  string_list options;
  struct mntentchn *mc, *fs;
  char *file;
  int result = 0;

  while ((c = getopt_long (argc, argv, "afhnrvVt:", longopts, NULL)) != EOF)
    switch (c) {
      case 'a':			/* umount everything */
	++all;
	break;
      case 'f':			/* force umount (needs kernel support) */
#if 0
	++force;
#else
	die (2, "umount: forced umount not supported yet");
#endif
	break;
      case 'h':			/* help */
	usage (stdout, 0);
	break;
      case 'n':
	++umount_nomtab;
	break;
      case 'r':			/* remount read-only if umount fails */
	++remount;
	break;
      case 'v':			/* make noise */
	++umount_verbose;
	break;
      case 'V':			/* version */
	printf ("umount: %s\n", version);
	exit (0);
      case 't':			/* specify file system type */
	types = parse_list (optarg);
	break;
      case 0:
	break;
      case '?':
      default:
	usage (stderr, 1);
    }

  if (getuid () != geteuid ())
    {
      umount_suid = 1;
      if (all || types || umount_nomtab)
	die (2, "umount: only root can do that");
    }

  argc -= optind;
  argv += optind;

  if (all) {
       if (types == NULL)
	  types = parse_list(xstrdup("noproc"));
       result = umount_all (types);
  } else if (argc < 1) {
       usage (stderr, 2);
  } else while (argc--) {
       file = canonicalize (*argv); /* mtab paths are canonicalized */
       if (umount_verbose > 1)
	  printf("Trying to umount %s\n", file);

       mc = getmntfile (file);
       if (!mc && umount_verbose)
	  printf("Could not find %s in mtab\n", file);

       if (umount_suid) {
	  if (!mc)
	    die (2, "umount: %s is not mounted (according to mtab)", file);
	  if (!(fs = getfsspec (file)) && !(fs = getfsfile (file)))
	    die (2, "umount: %s is not in the fstab (and you are not root)",
		 file);
	  if ((!streq (mc->mnt_fsname, fs->mnt_fsname) &&
	       !streq (mc->mnt_fsname, canonicalize (fs->mnt_fsname)))
	      || (!streq (mc->mnt_dir, fs->mnt_dir) &&
		  !streq (mc->mnt_dir, canonicalize (fs->mnt_dir)))) {
	    die (2, "umount: %s mount disagrees with the fstab", file);
	  }
	  options = parse_list (fs->mnt_opts);
	  while (options) {
	      if (streq (car (options), "user"))
		break;
	      options = cdr (options);
	  }
	  if (!options)
	    die (2, "umount: only root can unmount %s from %s",
		 fs->mnt_fsname, fs->mnt_dir);
       }

       if (mc)
	    result = umount_one (xstrdup(mc->mnt_fsname), xstrdup(mc->mnt_dir),
				 xstrdup(mc->mnt_type), xstrdup(mc->mnt_opts));
       else
	    result = umount_one (*argv, *argv, *argv, *argv);

       argv++;

  }
  exit (result);
}
Beispiel #4
0
int
main (int argc, char *argv[]) {
	int c;
	int all = 0;
	char *types = NULL, *test_opts = NULL, *p;
	int result = 0;

	sanitize_env();
	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	progname = argv[0];
	if ((p = strrchr(progname, '/')) != NULL)
		progname = p+1;

	umask(022);

	while ((c = getopt_long (argc, argv, "adfhlnrit:O:vV",
				 longopts, NULL)) != -1)
		switch (c) {
		case 'a':		/* umount everything */
			++all;
			break;
			/* fall through? */
		case 'd':		/* do losetup -d for unmounted loop devices */
			++delloop;
			break;
		case 'f':		/* force umount */
			++force;
			break;
		case 'h':		/* help */
			usage (stdout, 0);
			break;
		case 'l':		/* lazy umount */
			++lazy;
			break;
		case 'n':		/* do not write in /etc/mtab */
			++nomtab;
			break;
		case 'O':		/* specify file system options */
			test_opts = optarg;
			break;
		case 'r':		/* remount read-only if umount fails */
			++remount;
			break;
		case 'v':		/* make noise */
			++verbose;
			break;
		case 'V':		/* version */
			printf ("umount (%s)\n", PACKAGE_STRING);
			exit (0);
		case 't':		/* specify file system type */
			types = optarg;
			break;
		case 'i':
  			external_allowed = 0;
			break;
		case 0:
			break;
		case '?':
		default:
			usage (stderr, 1);
		}

	{
		const uid_t ruid = getuid();
		const uid_t euid = geteuid();

		/* if we're really root and aren't running setuid */
		if (((uid_t)0 == ruid) && (ruid == euid)) {
			restricted = 0;
		}
	}

	if (restricted && (all || types || nomtab || force || remount)) {
		die (2, _("umount: only root can do that"));
	}

	argc -= optind;
	argv += optind;

	atexit(unlock_mtab);

	if (all) {
		/* nodev stuff: sysfs, usbfs, oprofilefs, ... */
		if (types == NULL)
			types = "noproc,nodevfs,nodevpts,nosysfs,norpc_pipefs,nonfsd";
		result = umount_all (types, test_opts);
	} else if (argc < 1) {
		usage (stderr, 2);
	} else while (argc--) {
		result += umount_file(*argv++);
	}
	exit (result);		/* nonzero on at least one failure */
}
Beispiel #5
0
int main(int argc, char *argv[]) {
        bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
        bool in_container, use_watchdog = false, can_initrd;
        _cleanup_free_ char *cgroup = NULL;
        char *arguments[3];
        int cmd, r, umount_log_level = LOG_INFO;
        static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL};
        char *watchdog_device;

        /* The log target defaults to console, but the original systemd process will pass its log target in through a
         * command line argument, which will override this default. Also, ensure we'll never log to the journal or
         * syslog, as these logging daemons are either already dead or will die very soon. */

        log_set_target(LOG_TARGET_CONSOLE);
        log_set_prohibit_ipc(true);
        log_parse_environment();

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

        log_open();

        umask(0022);

        if (getpid_cached() != 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 {
                log_error("Unknown action '%s'.", arg_verb);
                r = -EINVAL;
                goto error;
        }

        (void) cg_get_root_path(&cgroup);
        in_container = detect_container() > 0;

        use_watchdog = getenv("WATCHDOG_USEC");
        watchdog_device = getenv("WATCHDOG_DEVICE");
        if (watchdog_device) {
                r = watchdog_set_device(watchdog_device);
                if (r < 0)
                        log_warning_errno(r, "Failed to set watchdog device to %s, ignoring: %m",
                                          watchdog_device);
        }

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

        /* Synchronize everything that is not written to disk yet at this point already. This is a good idea so that
         * slow IO is processed here already and the final process killing spree is not impacted by processes
         * desperately trying to sync IO to disk within their timeout. Do not remove this sync, data corruption will
         * result. */
        if (!in_container)
                sync_with_progress();

        disable_coredumps();

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

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

        need_umount = !in_container;
        need_swapoff = !in_container;
        need_loop_detach = !in_container;
        need_dm_detach = !in_container;
        can_initrd = !in_container && !in_initrd() && access("/run/initramfs/shutdown", X_OK) == 0;

        /* Unmount all mountpoints, swaps, and loopback devices */
        for (;;) {
                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, umount_log_level);
                        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, umount_log_level);
                        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, umount_log_level);
                        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) {
                        log_info("All filesystems, swaps, loop devices and DM devices detached.");
                        /* Yay, done */
                        break;
                }

                if (!changed && umount_log_level == LOG_INFO && !can_initrd) {
                        /* There are things we cannot get rid of. Loop one more time
                         * with LOG_ERR to inform the user. Note that we don't need
                         * to do this if there is a initrd to switch to, because that
                         * one is likely to get rid of the remounting mounts. If not,
                         * it will log about them. */
                        umount_log_level = LOG_ERR;
                        continue;
                }

                /* 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," : "");
                        break;
                }

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

        /* We're done with the watchdog. */
        watchdog_free_device();

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

        (void) rlimit_nofile_safe();

        if (can_initrd) {
                r = switch_root_initramfs();
                if (r >= 0) {
                        argv[0] = (char*) "/shutdown";

                        (void) setsid();
                        (void) 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 automatically flush ATA disks and suchlike on reboot(), but the file systems need to be
         * sync'ed explicitly in advance. So let's do this here, but not needlessly slow down containers. Note that we
         * sync'ed things already once above, but we did some more work since then which might have caused IO, hence
         * let's do it once more. Do not remove this sync, data corruption will result. */
        if (!in_container)
                sync_with_progress();

        if (streq(arg_verb, "exit")) {
                if (in_container)
                        return arg_exit_code;

                cmd = RB_POWER_OFF; /* We cannot exit() on the host, fallback on another method. */
        }

        switch (cmd) {

        case LINUX_REBOOT_CMD_KEXEC:

                if (!in_container) {
                        /* We cheat and exec kexec to avoid doing all its work */
                        log_info("Rebooting with kexec.");

                        r = safe_fork("(sd-kexec)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_WAIT, NULL);
                        if (r == 0) {
                                const char * const args[] = {
                                        KEXEC, "-e", NULL
                                };

                                /* Child */

                                execv(args[0], (char * const *) args);
                                _exit(EXIT_FAILURE);
                        }

                        /* If we are still running, then the kexec can't have worked, let's fall through */
                }

                cmd = RB_AUTOBOOT;
                _fallthrough_;

        case RB_AUTOBOOT:
                (void) reboot_with_parameter(REBOOT_LOG);
                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");
        }

        (void) 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.");
                return EXIT_SUCCESS;
        }

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

  error:
        log_emergency_errno(r, "Critical error while doing system shutdown: %m");
        freeze();
}
Beispiel #6
0
int main(int argc, char *argv[]) {
        int cmd, r;
        unsigned retries;
        bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
        bool killed_everbody = false, in_container;

        log_parse_environment();
        log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
        log_open();

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

        if (argc != 2) {
                log_error("Invalid number of arguments.");
                r = -EINVAL;
                goto error;
        }

        in_container = detect_container(NULL) > 0;

        if (streq(argv[1], "reboot"))
                cmd = RB_AUTOBOOT;
        else if (streq(argv[1], "poweroff"))
                cmd = RB_POWER_OFF;
        else if (streq(argv[1], "halt"))
                cmd = RB_HALT_SYSTEM;
        else if (streq(argv[1], "kexec"))
                cmd = LINUX_REBOOT_CMD_KEXEC;
        else {
                log_error("Unknown action '%s'.", argv[1]);
                r = -EINVAL;
                goto error;
        }

        /* lock us into memory */
        if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0)
                log_warning("Cannot lock process memory: %m");

        log_info("Sending SIGTERM to remaining processes...");
        send_signal(SIGTERM);

        log_info("Sending SIGKILL to remaining processes...");
        send_signal(SIGKILL);

        if (in_container)
                need_swapoff = false;

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

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

                if (need_swapoff) {
                        log_info("Disabling swaps.");
                        r = swapoff_all(&changed);
                        if (r == 0)
                                need_swapoff = false;
                        else if (r > 0)
                                log_info("Not all swaps are turned off, %d left.", r);
                        else
                                log_error("Failed to turn off swaps: %s", strerror(-r));
                }

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

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

                if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach)
                        /* Yay, done */
                        break;

                /* If in this iteration we didn't manage to
                 * unmount/deactivate anything, we either kill more
                 * processes, or simply give up */
                if (!changed) {

                        if (killed_everbody) {
                                /* Hmm, we already killed everybody,
                                 * let's just give up */
                                log_error("Cannot finalize remaining file systems and devices, giving up.");
                                break;
                        }

                        log_warning("Cannot finalize remaining file systems and devices, trying to kill remaining processes.");
                        ultimate_send_signal(SIGTERM);
                        ultimate_send_signal(SIGKILL);
                        killed_everbody = true;
                }

                log_debug("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1);
        }

        if (retries >= FINALIZE_ATTEMPTS)
                log_error("Too many iterations, giving up.");

        execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, NULL);

        /* If we are in a container, just exit, this will kill our
         * container for good. */
        if (in_container) {
                log_error("Exiting container.");
                exit(0);
        }

        sync();

        if (cmd == LINUX_REBOOT_CMD_KEXEC) {
                /* We cheat and exec kexec to avoid doing all its work */
                pid_t pid = fork();

                if (pid < 0)
                        log_error("Could not fork: %m. Falling back to normal reboot.");
                else if (pid > 0) {
                        wait_for_terminate_and_warn("kexec", pid);
                        log_warning("kexec failed. Falling back to normal reboot.");
                } else {
                        /* Child */
                        const char *args[3] = { "/sbin/kexec", "-e", NULL };
                        execv(args[0], (char * const *) args);
                        return EXIT_FAILURE;
                }

                cmd = RB_AUTOBOOT;
        }

        reboot(cmd);
        log_error("Failed to invoke reboot(): %m");
        r = -errno;

  error:
        log_error("Critical error while doing system shutdown: %s", strerror(-r));

        freeze();
        return EXIT_FAILURE;
}
Beispiel #7
0
int
main (int argc, char *argv[])
{
  int c;
  int all = 0;
  string_list types = NULL;
  string_list options;
  struct mntentchn *mc, *fs;
  char *file;
  int result = 0;

  setlocale(LC_ALL, "");
  bindtextdomain(PACKAGE, LOCALEDIR);
  textdomain(PACKAGE);

  while ((c = getopt_long (argc, argv, "afhnrt:vV",
			   longopts, NULL)) != EOF)
    switch (c) {
      case 'a':			/* umount everything */
	++all;
	break;
      case 'f':			/* force umount */
	++force;
	break;
      case 'h':			/* help */
	usage (stdout, 0);
	break;
      case 'n':			/* do not write in /etc/mtab */
	++nomtab;
	break;
      case 'r':			/* remount read-only if umount fails */
	++remount;
	break;
      case 'v':			/* make noise */
	++verbose;
	break;
      case 'V':			/* version */
	printf ("umount: %s\n", version);
	exit (0);
      case 't':			/* specify file system type */
	types = parse_list (optarg);
	break;
      case 0:
	break;
      case '?':
      default:
	usage (stderr, 1);
    }

  if (getuid () != geteuid ())
    {
      suid = 1;
      if (all || types || nomtab || force)
	die (2, _("umount: only root can do that"));
    }

  argc -= optind;
  argv += optind;

  if (all) {
       if (types == NULL)
	  types = parse_list("noproc");
       result = umount_all (types);
  } else if (argc < 1) {
       usage (stderr, 2);
  } else while (argc--) {
       file = canonicalize (*argv); /* mtab paths are canonicalized */
       if (verbose > 1)
	  printf(_("Trying to umount %s\n"), file);

       mc = getmntfilesbackward (file, NULL);
       if (!mc && verbose)
	  printf(_("Could not find %s in mtab\n"), file);

       if (suid) {
	  if (!mc)
	    die (2, _("umount: %s is not mounted (according to mtab)"), file);
	  if (getmntfilesbackward (file, mc))
	    die (2, _("umount: it seems %s is mounted multiple times"), file);

	  /* If fstab contains the two lines
	       /dev/sda1 /mnt/zip auto user,noauto  0 0
	       /dev/sda4 /mnt/zip auto user,noauto  0 0
	     then "mount /dev/sda4" followed by "umount /mnt/zip"
	     used to fail. So, we must not look for file, but for
	     the pair (spec,file) in fstab. */
	  fs = getfsspecfile(mc->mnt_fsname, mc->mnt_dir);
	  if (!fs) {
	    if (!getfsspec (file) && !getfsfile (file))
	      die (2,
		 _("umount: %s is not in the fstab (and you are not root)"),
		 file);
	    else
	      die (2, _("umount: %s mount disagrees with the fstab"), file);
	  }

	  /* User mounting and unmounting is allowed only
	     if fstab contains the option `user' or `users' */
	  /* The option `users' allows arbitrary users to mount
	     and unmount - this may be a security risk. */
	  /* The option `user' only allows unmounting by the user
	     that mounted. */
	  /* The option `owner' only allows (un)mounting by the owner. */
	  /* A convenient side effect is that the user who mounted
	     is visible in mtab. */
	  options = parse_list (fs->mnt_opts);
	  while (options) {
	      if (streq (car (options), "user") ||
		  streq (car (options), "users") ||
		  streq (car (options), "owner"))
		break;
	      options = cdr (options);
	  }
	  if (!options)
	    die (2, _("umount: only root can unmount %s from %s"),
		 fs->mnt_fsname, fs->mnt_dir);
	  if (streq (car (options), "user") ||
	      streq (car (options), "owner")) {
	      char *user = getusername();

	      options = parse_list (mc->mnt_opts);
	      while (options) {
		  char *co = car (options);
		  if (!strncmp(co, "user="******"umount: only %s can unmount %s from %s"),
			      co+5, fs->mnt_fsname, fs->mnt_dir);
		      break;
		  }
		  options = cdr (options);
	      }
	  }
       }

       if (mc)
	    result = umount_one_bw (file, mc);
       else
	    result = umount_one (*argv, *argv, *argv, *argv, NULL);

       argv++;

  }
  exit (result);
}