556 lines
20 KiB
C
556 lines
20 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 ProFUSION embedded systems
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <getopt.h>
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#include <linux/reboot.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/reboot.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "async.h"
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#include "cgroup-util.h"
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#include "def.h"
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#include "exec-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "killall.h"
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#include "log.h"
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#include "missing.h"
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#include "parse-util.h"
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#include "process-util.h"
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#include "signal-util.h"
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#include "string-util.h"
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#include "switch-root.h"
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#include "terminal-util.h"
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#include "umount.h"
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#include "util.h"
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#include "virt.h"
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#include "watchdog.h"
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#define FINALIZE_ATTEMPTS 50
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#define SYNC_PROGRESS_ATTEMPTS 3
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#define SYNC_TIMEOUT_USEC (10*USEC_PER_SEC)
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static char* arg_verb;
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static uint8_t arg_exit_code;
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_LOG_LEVEL = 0x100,
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ARG_LOG_TARGET,
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ARG_LOG_COLOR,
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ARG_LOG_LOCATION,
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ARG_EXIT_CODE,
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};
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static const struct option options[] = {
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{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },
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{ "log-target", required_argument, NULL, ARG_LOG_TARGET },
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{ "log-color", optional_argument, NULL, ARG_LOG_COLOR },
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{ "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
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{ "exit-code", required_argument, NULL, ARG_EXIT_CODE },
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{}
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};
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int c, r;
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assert(argc >= 1);
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assert(argv);
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/* "-" prevents getopt from permuting argv[] and moving the verb away
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* from argv[1]. Our interface to initrd promises it'll be there. */
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while ((c = getopt_long(argc, argv, "-", options, NULL)) >= 0)
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switch (c) {
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case ARG_LOG_LEVEL:
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r = log_set_max_level_from_string(optarg);
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if (r < 0)
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log_error("Failed to parse log level %s, ignoring.", optarg);
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break;
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case ARG_LOG_TARGET:
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r = log_set_target_from_string(optarg);
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if (r < 0)
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log_error("Failed to parse log target %s, ignoring", optarg);
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break;
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case ARG_LOG_COLOR:
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if (optarg) {
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r = log_show_color_from_string(optarg);
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if (r < 0)
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log_error("Failed to parse log color setting %s, ignoring", optarg);
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} else
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log_show_color(true);
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break;
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case ARG_LOG_LOCATION:
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if (optarg) {
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r = log_show_location_from_string(optarg);
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if (r < 0)
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log_error("Failed to parse log location setting %s, ignoring", optarg);
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} else
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log_show_location(true);
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break;
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case ARG_EXIT_CODE:
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r = safe_atou8(optarg, &arg_exit_code);
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if (r < 0)
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log_error("Failed to parse exit code %s, ignoring", optarg);
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break;
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case '\001':
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if (!arg_verb)
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arg_verb = optarg;
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else
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log_error("Excess arguments, ignoring");
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option code.");
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}
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if (!arg_verb) {
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log_error("Verb argument missing.");
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return -EINVAL;
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}
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return 0;
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}
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static int switch_root_initramfs(void) {
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if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0)
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return log_error_errno(errno, "Failed to mount bind /run/initramfs on /run/initramfs: %m");
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if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0)
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return log_error_errno(errno, "Failed to make /run/initramfs private mount: %m");
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/* switch_root with MS_BIND, because there might still be processes lurking around, which have open file descriptors.
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* /run/initramfs/shutdown will take care of these.
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* Also do not detach the old root, because /run/initramfs/shutdown needs to access it.
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*/
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return switch_root("/run/initramfs", "/oldroot", false, MS_BIND);
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}
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/* Read the following fields from /proc/meminfo:
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*
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* NFS_Unstable
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* Writeback
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* Dirty
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*
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* Return true if the sum of these fields is greater than the previous
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* value input. For all other issues, report the failure and indicate that
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* the sync is not making progress.
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*/
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static bool sync_making_progress(unsigned long long *prev_dirty) {
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_cleanup_fclose_ FILE *f = NULL;
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char line[LINE_MAX];
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bool r = false;
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unsigned long long val = 0;
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f = fopen("/proc/meminfo", "re");
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if (!f)
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return log_warning_errno(errno, "Failed to open /proc/meminfo: %m");
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FOREACH_LINE(line, f, log_warning_errno(errno, "Failed to parse /proc/meminfo: %m")) {
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unsigned long long ull = 0;
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if (!first_word(line, "NFS_Unstable:") && !first_word(line, "Writeback:") && !first_word(line, "Dirty:"))
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continue;
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errno = 0;
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if (sscanf(line, "%*s %llu %*s", &ull) != 1) {
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if (errno != 0)
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log_warning_errno(errno, "Failed to parse /proc/meminfo: %m");
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else
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log_warning("Failed to parse /proc/meminfo");
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return false;
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}
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val += ull;
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}
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r = *prev_dirty > val;
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*prev_dirty = val;
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return r;
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}
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static void sync_with_progress(void) {
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unsigned long long dirty = ULONG_LONG_MAX;
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unsigned checks;
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pid_t pid;
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int r;
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BLOCK_SIGNALS(SIGCHLD);
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/* Due to the possiblity of the sync operation hanging, we fork a child process and monitor the progress. If
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* the timeout lapses, the assumption is that that particular sync stalled. */
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r = asynchronous_sync(&pid);
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if (r < 0) {
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log_error_errno(r, "Failed to fork sync(): %m");
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return;
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}
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log_info("Syncing filesystems and block devices.");
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/* Start monitoring the sync operation. If more than
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* SYNC_PROGRESS_ATTEMPTS lapse without progress being made,
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* we assume that the sync is stalled */
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for (checks = 0; checks < SYNC_PROGRESS_ATTEMPTS; checks++) {
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r = wait_for_terminate_with_timeout(pid, SYNC_TIMEOUT_USEC);
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if (r == 0)
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/* Sync finished without error.
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* (The sync itself does not return an error code) */
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return;
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else if (r == -ETIMEDOUT) {
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/* Reset the check counter if the "Dirty" value is
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* decreasing */
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if (sync_making_progress(&dirty))
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checks = 0;
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} else {
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log_error_errno(r, "Failed to sync filesystems and block devices: %m");
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return;
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}
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}
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/* Only reached in the event of a timeout. We should issue a kill
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* to the stray process. */
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log_error("Syncing filesystems and block devices - timed out, issuing SIGKILL to PID "PID_FMT".", pid);
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(void) kill(pid, SIGKILL);
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}
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int main(int argc, char *argv[]) {
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bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
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bool in_container, use_watchdog = false;
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_cleanup_free_ char *cgroup = NULL;
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char *arguments[3];
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unsigned retries;
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int cmd, r;
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static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL};
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char *watchdog_device;
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log_parse_environment();
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r = parse_argv(argc, argv);
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if (r < 0)
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goto error;
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/* journald will die if not gone yet. The log target defaults
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* to console, but may have been changed by command line options. */
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log_close_console(); /* force reopen of /dev/console */
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log_open();
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umask(0022);
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if (getpid_cached() != 1) {
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log_error("Not executed by init (PID 1).");
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r = -EPERM;
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goto error;
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}
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if (streq(arg_verb, "reboot"))
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cmd = RB_AUTOBOOT;
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else if (streq(arg_verb, "poweroff"))
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cmd = RB_POWER_OFF;
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else if (streq(arg_verb, "halt"))
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cmd = RB_HALT_SYSTEM;
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else if (streq(arg_verb, "kexec"))
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cmd = LINUX_REBOOT_CMD_KEXEC;
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else if (streq(arg_verb, "exit"))
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cmd = 0; /* ignored, just checking that arg_verb is valid */
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else {
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r = -EINVAL;
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log_error("Unknown action '%s'.", arg_verb);
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goto error;
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}
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(void) cg_get_root_path(&cgroup);
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in_container = detect_container() > 0;
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use_watchdog = !!getenv("WATCHDOG_USEC");
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watchdog_device = getenv("WATCHDOG_DEVICE");
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if (watchdog_device) {
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r = watchdog_set_device(watchdog_device);
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if (r < 0)
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log_warning_errno(r, "Failed to set watchdog device to %s, ignoring: %m",
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watchdog_device);
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}
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/* Lock us into memory */
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mlockall(MCL_CURRENT|MCL_FUTURE);
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/* Synchronize everything that is not written to disk yet at this point already. This is a good idea so that
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* slow IO is processed here already and the final process killing spree is not impacted by processes
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* desperately trying to sync IO to disk within their timeout. Do not remove this sync, data corruption will
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* result. */
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if (!in_container)
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sync_with_progress();
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log_info("Sending SIGTERM to remaining processes...");
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broadcast_signal(SIGTERM, true, true);
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log_info("Sending SIGKILL to remaining processes...");
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broadcast_signal(SIGKILL, true, false);
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need_umount = !in_container;
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need_swapoff = !in_container;
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need_loop_detach = !in_container;
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need_dm_detach = !in_container;
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/* Unmount all mountpoints, swaps, and loopback devices */
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for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
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bool changed = false;
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if (use_watchdog)
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watchdog_ping();
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/* Let's trim the cgroup tree on each iteration so
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that we leave an empty cgroup tree around, so that
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container managers get a nice notify event when we
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are down */
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if (cgroup)
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cg_trim(SYSTEMD_CGROUP_CONTROLLER, cgroup, false);
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if (need_umount) {
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log_info("Unmounting file systems.");
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r = umount_all(&changed);
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if (r == 0) {
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need_umount = false;
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log_info("All filesystems unmounted.");
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} else if (r > 0)
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log_info("Not all file systems unmounted, %d left.", r);
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else
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log_error_errno(r, "Failed to unmount file systems: %m");
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}
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if (need_swapoff) {
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log_info("Deactivating swaps.");
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r = swapoff_all(&changed);
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if (r == 0) {
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need_swapoff = false;
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log_info("All swaps deactivated.");
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} else if (r > 0)
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log_info("Not all swaps deactivated, %d left.", r);
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else
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log_error_errno(r, "Failed to deactivate swaps: %m");
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}
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if (need_loop_detach) {
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log_info("Detaching loop devices.");
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r = loopback_detach_all(&changed);
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if (r == 0) {
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need_loop_detach = false;
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log_info("All loop devices detached.");
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} else if (r > 0)
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log_info("Not all loop devices detached, %d left.", r);
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else
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log_error_errno(r, "Failed to detach loop devices: %m");
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}
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if (need_dm_detach) {
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log_info("Detaching DM devices.");
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r = dm_detach_all(&changed);
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if (r == 0) {
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need_dm_detach = false;
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log_info("All DM devices detached.");
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} else if (r > 0)
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log_info("Not all DM devices detached, %d left.", r);
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else
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log_error_errno(r, "Failed to detach DM devices: %m");
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}
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if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) {
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if (retries > 0)
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log_info("All filesystems, swaps, loop devices, DM devices detached.");
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/* Yay, done */
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goto initrd_jump;
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}
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/* If in this iteration we didn't manage to
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* unmount/deactivate anything, we simply give up */
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if (!changed) {
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log_info("Cannot finalize remaining%s%s%s%s continuing.",
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need_umount ? " file systems," : "",
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need_swapoff ? " swap devices," : "",
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need_loop_detach ? " loop devices," : "",
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need_dm_detach ? " DM devices," : "");
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goto initrd_jump;
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}
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log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.",
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retries + 1,
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need_umount ? " file systems," : "",
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need_swapoff ? " swap devices," : "",
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need_loop_detach ? " loop devices," : "",
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need_dm_detach ? " DM devices," : "");
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}
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log_error("Too many iterations, giving up.");
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initrd_jump:
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/* We're done with the watchdog. */
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watchdog_free_device();
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arguments[0] = NULL;
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arguments[1] = arg_verb;
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arguments[2] = NULL;
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execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
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if (!in_container && !in_initrd() &&
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access("/run/initramfs/shutdown", X_OK) == 0) {
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r = switch_root_initramfs();
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if (r >= 0) {
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argv[0] = (char*) "/shutdown";
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setsid();
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make_console_stdio();
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log_info("Successfully changed into root pivot.\n"
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"Returning to initrd...");
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execv("/shutdown", argv);
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log_error_errno(errno, "Failed to execute shutdown binary: %m");
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} else
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log_error_errno(r, "Failed to switch root to \"/run/initramfs\": %m");
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}
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if (need_umount || need_swapoff || need_loop_detach || need_dm_detach)
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log_error("Failed to finalize %s%s%s%s ignoring",
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need_umount ? " file systems," : "",
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need_swapoff ? " swap devices," : "",
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need_loop_detach ? " loop devices," : "",
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need_dm_detach ? " DM devices," : "");
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/* The kernel will automatically flush ATA disks and suchlike on reboot(), but the file systems need to be
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* sync'ed explicitly in advance. So let's do this here, but not needlessly slow down containers. Note that we
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* sync'ed things already once above, but we did some more work since then which might have caused IO, hence
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* let's do it once more. Do not remove this sync, data corruption will result. */
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if (!in_container)
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sync_with_progress();
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if (streq(arg_verb, "exit")) {
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if (in_container)
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exit(arg_exit_code);
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else {
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/* We cannot exit() on the host, fallback on another
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* method. */
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cmd = RB_POWER_OFF;
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}
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}
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switch (cmd) {
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case LINUX_REBOOT_CMD_KEXEC:
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if (!in_container) {
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/* We cheat and exec kexec to avoid doing all its work */
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pid_t pid;
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log_info("Rebooting with kexec.");
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r = safe_fork("(sd-kexec)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &pid);
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if (r < 0)
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log_error_errno(r, "Failed to fork: %m");
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if (r == 0) {
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const char * const args[] = {
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KEXEC, "-e", NULL
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};
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/* Child */
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execv(args[0], (char * const *) args);
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_exit(EXIT_FAILURE);
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}
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(void) wait_for_terminate_and_warn("kexec", pid, true);
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}
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cmd = RB_AUTOBOOT;
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_fallthrough_;
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case RB_AUTOBOOT:
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if (!in_container) {
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_cleanup_free_ char *param = NULL;
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r = read_one_line_file("/run/systemd/reboot-param", ¶m);
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if (r < 0 && r != -ENOENT)
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log_warning_errno(r, "Failed to read reboot parameter file: %m");
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if (!isempty(param)) {
|
|
log_info("Rebooting with argument '%s'.", param);
|
|
syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param);
|
|
log_warning_errno(errno, "Failed to reboot with parameter, retrying without: %m");
|
|
}
|
|
}
|
|
|
|
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(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();
|
|
}
|