#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
+#include <getopt.h>
#include "missing.h"
#include "log.h"
#include "killall.h"
#include "cgroup-util.h"
#include "def.h"
+#include "switch-root.h"
#define FINALIZE_ATTEMPTS 50
-static int prepare_new_root(void) {
- static const char dirs[] =
- "/run/initramfs/oldroot\0"
- "/run/initramfs/proc\0"
- "/run/initramfs/sys\0"
- "/run/initramfs/dev\0"
- "/run/initramfs/run\0";
+static char* arg_verb;
- const char *dir;
+static int parse_argv(int argc, char *argv[]) {
+ enum {
+ ARG_LOG_LEVEL = 0x100,
+ ARG_LOG_TARGET,
+ ARG_LOG_COLOR,
+ ARG_LOG_LOCATION,
+ };
- if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) {
- log_error("Failed to mount bind /run/initramfs on /run/initramfs: %m");
- return -errno;
- }
+ 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 },
+ {}
+ };
- if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) {
- log_error("Failed to make /run/initramfs private mount: %m");
- return -errno;
- }
+ int c, r;
- NULSTR_FOREACH(dir, dirs)
- if (mkdir_p_label(dir, 0755) < 0 && errno != EEXIST) {
- log_error("Failed to mkdir %s: %m", dir);
- return -errno;
- }
+ assert(argc >= 1);
+ assert(argv);
- if (mount("/sys", "/run/initramfs/sys", NULL, MS_BIND, NULL) < 0) {
- log_error("Failed to mount bind /sys on /run/initramfs/sys: %m");
- return -errno;
- }
+ /* "-" 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) {
- if (mount("/proc", "/run/initramfs/proc", NULL, MS_BIND, NULL) < 0) {
- log_error("Failed to mount bind /proc on /run/initramfs/proc: %m");
- return -errno;
- }
+ 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);
- if (mount("/dev", "/run/initramfs/dev", NULL, MS_BIND, NULL) < 0) {
- log_error("Failed to mount bind /dev on /run/initramfs/dev: %m");
- return -errno;
- }
+ break;
- if (mount("/run", "/run/initramfs/run", NULL, MS_BIND, NULL) < 0) {
- log_error("Failed to mount bind /run on /run/initramfs/run: %m");
- return -errno;
+ 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 pivot_to_new_root(void) {
-
- if (chdir("/run/initramfs") < 0) {
- log_error("Failed to change directory to /run/initramfs: %m");
+static int switch_root_initramfs(void) {
+ if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) {
+ log_error("Failed to mount bind /run/initramfs on /run/initramfs: %m");
return -errno;
}
- /* Work-around for a kernel bug: for some reason the kernel
- * refuses switching root if any file systems are mounted
- * MS_SHARED. Hence remount them MS_PRIVATE here as a
- * work-around.
- *
- * https://bugzilla.redhat.com/show_bug.cgi?id=847418 */
- if (mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) < 0)
- log_warning("Failed to make \"/\" private mount: %m");
-
- if (pivot_root(".", "oldroot") < 0) {
- log_error("pivot failed: %m");
- /* only chroot if pivot root succeeded */
+ if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) {
+ log_error("Failed to make /run/initramfs private mount: %m");
return -errno;
}
- chroot(".");
-
- setsid();
- make_console_stdio();
-
- log_info("Successfully changed into root pivot.");
-
- return 0;
+ /* switch_root with MS_BIND, because there might still be processes lurking around, which have open file desriptors.
+ * /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 = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
+ bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
bool in_container, use_watchdog = false;
- _cleanup_free_ char *line = NULL, *cgroup = NULL;
+ _cleanup_free_ char *cgroup = NULL;
char *arguments[3];
unsigned retries;
int cmd, r;
- /* suppress shutdown status output if 'quiet' is used */
- r = proc_cmdline(&line);
- if (r > 0) {
- char *w, *state;
- size_t l;
+ log_parse_environment();
+ r = parse_argv(argc, argv);
+ if (r < 0)
+ goto error;
- FOREACH_WORD_QUOTED(w, l, line, state) {
- if (l == 5 && memcmp(w, "quiet", 5) == 0) {
- log_set_max_level(LOG_WARNING);
- break;
- }
- }
- }
+ /* journald will die if not gone yet. The log target defaults
+ * to console, but may have been changed by command line options. */
- log_parse_environment();
- log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
+ log_close_console(); /* force reopen of /dev/console */
log_open();
umask(0022);
if (getpid() != 1) {
- log_error("Not executed by init (pid 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"))
+ if (streq(arg_verb, "reboot"))
cmd = RB_AUTOBOOT;
- else if (streq(argv[1], "poweroff"))
+ else if (streq(arg_verb, "poweroff"))
cmd = RB_POWER_OFF;
- else if (streq(argv[1], "halt"))
+ else if (streq(arg_verb, "halt"))
cmd = RB_HALT_SYSTEM;
- else if (streq(argv[1], "kexec"))
+ else if (streq(arg_verb, "kexec"))
cmd = LINUX_REBOOT_CMD_KEXEC;
else {
- log_error("Unknown action '%s'.", argv[1]);
r = -EINVAL;
+ log_error("Unknown action '%s'.", arg_verb);
goto error;
}
mlockall(MCL_CURRENT|MCL_FUTURE);
log_info("Sending SIGTERM to remaining processes...");
- broadcast_signal(SIGTERM, true);
+ broadcast_signal(SIGTERM, true, true);
log_info("Sending SIGKILL to remaining processes...");
- broadcast_signal(SIGKILL, true);
+ broadcast_signal(SIGKILL, true, false);
- if (in_container) {
- need_swapoff = false;
- need_dm_detach = false;
- need_loop_detach = 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++) {
} 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));
+ log_error_errno(r, "Failed to unmount file systems: %m");
}
if (need_swapoff) {
} else if (r > 0)
log_info("Not all swaps deactivated, %d left.", r);
else
- log_error("Failed to deactivate swaps: %s", strerror(-r));
+ log_error_errno(r, "Failed to deactivate swaps: %m");
}
if (need_loop_detach) {
} 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));
+ log_error_errno(r, "Failed to detach loop devices: %m");
}
if (need_dm_detach) {
} else if (r > 0)
log_info("Not all DM devices detached, %d left.", r);
else
- log_error("Failed to detach DM devices: %s", strerror(-r));
+ 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 */
- break;
+ goto initrd_jump;
}
/* 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_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("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1);
+ 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," : "");
}
- if (retries >= FINALIZE_ATTEMPTS)
- log_error("Too many iterations, giving up.");
- else
- log_info("Storage is finalized.");
+ log_error("Too many iterations, giving up.");
+
+ initrd_jump:
arguments[0] = NULL;
- arguments[1] = argv[1];
+ arguments[1] = arg_verb;
arguments[2] = NULL;
- execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, arguments);
+ execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, 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";
- if (prepare_new_root() >= 0 &&
- pivot_to_new_root() >= 0) {
+ setsid();
+ make_console_stdio();
- log_info("Returning to initrd...");
+ log_info("Successfully changed into root pivot.\n"
+ "Returning to initrd...");
execv("/shutdown", argv);
log_error("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
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);
+ syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param);
}
}
r = -errno;
error:
- log_error("Critical error while doing system shutdown: %s", strerror(-r));
+ log_emergency_errno(r, "Critical error while doing system shutdown: %m");
freeze();
- return EXIT_FAILURE;
}