+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- 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 <sys/mman.h>
-#include <sys/reboot.h>
-#include <linux/reboot.h>
-#include <sys/stat.h>
-#include <sys/mount.h>
-#include <errno.h>
-#include <unistd.h>
-#include <signal.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <getopt.h>
-
-#include "missing.h"
-#include "log.h"
-#include "fileio.h"
-#include "umount.h"
-#include "util.h"
-#include "virt.h"
-#include "watchdog.h"
-#include "killall.h"
-#include "cgroup-util.h"
-#include "def.h"
-#include "switch-root.h"
-
-#define FINALIZE_ATTEMPTS 50
-
-static char* arg_verb;
-
-static int parse_argv(int argc, char *argv[]) {
- enum {
- ARG_LOG_LEVEL = 0x100,
- ARG_LOG_TARGET,
- ARG_LOG_COLOR,
- ARG_LOG_LOCATION,
- };
-
- 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 },
- {}
- };
-
- 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 '\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 {
- 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(NULL) > 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();
-
- 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, ¶m) >= 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);
- }
-
- log_error_errno(errno, "Failed to invoke reboot(): %m");
- r = -errno;
-
- error:
- log_emergency_errno(r, "Critical error while doing system shutdown: %m");
-
- freeze();
-}
~ianmdlvl / elogind.git / blobdiff