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authorHarald Hoyer <harald@redhat.com>2014-08-21 16:21:26 +0200
committerHarald Hoyer <harald@redhat.com>2014-08-28 15:25:15 +0200
commit5a4bf02ff57e4dd3453f2b868c72fe45f60033a3 (patch)
tree2dfa5385d7af4ad0e8cc040a0a46807e103387c1 /src/core/shutdown.c
parent667a0377fb25ddb0c3efbc43d186ffd4c097ce41 (diff)
use the switch_root function in shutdown
removes code duplication also move switch-root to shared
Diffstat (limited to 'src/core/shutdown.c')
-rw-r--r--src/core/shutdown.c90
1 files changed, 17 insertions, 73 deletions
diff --git a/src/core/shutdown.c b/src/core/shutdown.c
index 0e2ea5754f..1e88b05790 100644
--- a/src/core/shutdown.c
+++ b/src/core/shutdown.c
@@ -48,6 +48,7 @@
#include "killall.h"
#include "cgroup-util.h"
#include "def.h"
+#include "switch-root.h"
#define FINALIZE_ATTEMPTS 50
@@ -131,16 +132,7 @@ static int parse_argv(int argc, char *argv[]) {
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;
@@ -151,66 +143,13 @@ static int prepare_new_root(void) {
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;
@@ -372,16 +311,21 @@ int main(int argc, char *argv[]) {
if (!in_container && !in_initrd() &&
access("/run/initramfs/shutdown", X_OK) == 0) {
-
- if (prepare_new_root() >= 0 &&
- pivot_to_new_root() >= 0) {
+ r = switch_root_initramfs();
+ if (r >= 0) {
arguments[0] = (char*) "/shutdown";
- log_info("Returning to initrd...");
+ setsid();
+ make_console_stdio();
+
+ log_info("Successfully changed into root pivot.\n"
+ "Returning to initrd...");
execv("/shutdown", arguments);
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)