#include "killall.h"
#include "cgroup-util.h"
#include "def.h"
+#include "switch-root.h"
#define FINALIZE_ATTEMPTS 50
assert(argc >= 1);
assert(argv);
- opterr = 0;
-
- while ((c = getopt_long(argc, argv, ":", options, NULL)) >= 0)
+ /* "-" 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:
break;
- case '?':
- log_error("Unknown option %s.", argv[optind-1]);
- return -EINVAL;
+ case '\001':
+ if (!arg_verb)
+ arg_verb = optarg;
+ else
+ log_error("Excess arguments, ignoring");
+ break;
- case ':':
- log_error("Missing argument to %s.", argv[optind-1]);
+ case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option code.");
}
- if (optind >= argc) {
+ if (!arg_verb) {
log_error("Verb argument missing.");
return -EINVAL;
}
- arg_verb = argv[optind];
-
- if (optind + 1 < argc)
- log_error("Excess arguments, ignoring");
return 0;
}
-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";
-
- const char *dir;
-
+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;
return -errno;
}
- NULSTR_FOREACH(dir, dirs)
- if (mkdir_p_label(dir, 0755) < 0 && errno != EEXIST) {
- log_error("Failed to mkdir %s: %m", dir);
- return -errno;
- }
-
- 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;
- }
-
- 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;
- }
-
- 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;
- }
-
- 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;
- }
-
- 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);
}
-static int pivot_to_new_root(void) {
-
- if (chdir("/run/initramfs") < 0) {
- log_error("Failed to change directory to /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 */
- return -errno;
- }
-
- chroot(".");
-
- setsid();
- make_console_stdio();
-
- log_info("Successfully changed into root pivot.");
-
- return 0;
-}
int main(int argc, char *argv[]) {
bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
goto error;
/* journald will die if not gone yet. The log target defaults
- * to console, but may have been changed by commandline options. */
+ * to console, but may have been changed by command line options. */
log_close_console(); /* force reopen of /dev/console */
log_open();
in_container = detect_container(NULL) > 0;
- need_umount = true;
+ need_umount = !in_container;
need_swapoff = !in_container;
need_loop_detach = !in_container;
need_dm_detach = !in_container;
arguments[0] = NULL;
arguments[1] = arg_verb;
arguments[2] = NULL;
- execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments, NULL);
+ 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) {
- arguments[0] = (char*) "/shutdown";
+ setsid();
+ make_console_stdio();
- log_info("Returning to initrd...");
+ log_info("Successfully changed into root pivot.\n"
+ "Returning to initrd...");
- execv("/shutdown", arguments);
+ execv("/shutdown", argv);
log_error("Failed to execute shutdown binary: %m");
- }
+ } else
+ log_error("Failed to switch root to \"/run/initramfs\": %s", strerror(-r));
+
}
if (need_umount || need_swapoff || need_loop_detach || need_dm_detach)
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);
}
}
~ianmdlvl / elogind.git / blobdiff