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Diffstat (limited to 'src/core/main.c')
-rw-r--r--src/core/main.c98
1 files changed, 9 insertions, 89 deletions
diff --git a/src/core/main.c b/src/core/main.c
index 4d09cb7174..22052220f9 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -49,6 +49,7 @@
#include "virt.h"
#include "watchdog.h"
#include "path-util.h"
+#include "switch-root.h"
#include "mount-setup.h"
#include "loopback-setup.h"
@@ -1173,90 +1174,6 @@ static void test_cgroups(void) {
sleep(10);
}
-static int do_switch_root(const char *switch_root) {
- int r=0;
- /* Don't try to unmount the old "/", there's no way to do it. */
- const char *umounts[] = { "/dev", "/proc", "/sys", "/run", NULL };
- int i;
- int cfd = -1;
- struct stat switch_root_stat, sb;
- bool remove_old_root;
-
- if (path_equal(switch_root, "/"))
- return 0;
-
- if (stat(switch_root, &switch_root_stat) != 0) {
- r = -errno;
- log_error("failed to stat directory %s", switch_root);
- goto fail;
- }
-
- remove_old_root = in_initrd();
-
- for (i = 0; umounts[i] != NULL; i++) {
- char newmount[PATH_MAX];
-
- snprintf(newmount, sizeof(newmount), "%s%s", switch_root, umounts[i]);
-
- if ((stat(newmount, &sb) != 0) || (sb.st_dev != switch_root_stat.st_dev)) {
- /* mount point seems to be mounted already or stat failed */
- umount2(umounts[i], MNT_DETACH);
- continue;
- }
-
- if (mount(umounts[i], newmount, NULL, MS_MOVE, NULL) < 0) {
- log_error("failed to mount moving %s to %s",
- umounts[i], newmount);
- log_error("forcing unmount of %s", umounts[i]);
- umount2(umounts[i], MNT_FORCE);
- }
- }
-
- if (chdir(switch_root)) {
- r = -errno;
- log_error("failed to change directory to %s", switch_root);
- goto fail;
- }
-
- if (remove_old_root)
- cfd = open("/", O_RDONLY);
-
- if (mount(switch_root, "/", NULL, MS_MOVE, NULL) < 0) {
- r = -errno;
- log_error("failed to mount moving %s to /", switch_root);
- goto fail;
- }
-
- if (chroot(".")) {
- r = -errno;
- log_error("failed to change root");
- goto fail;
- }
-
- if (cfd >= 0) {
- struct stat rb;
-
- if (fstat(cfd, &rb)) {
- log_error("failed to stat old root directory");
- goto fail;
- }
-
- rm_rf_children(cfd, false, false, &rb);
- close(cfd);
- cfd=-1;
- }
-
- return 0;
-
-fail:
- if (cfd >= 0)
- close(cfd);
-
- log_error("Failed to switch root, ignoring: %s", strerror(-r));
-
- return r;
-}
-
int main(int argc, char *argv[]) {
Manager *m = NULL;
int r, retval = EXIT_FAILURE;
@@ -1271,7 +1188,7 @@ int main(int argc, char *argv[]) {
int j;
bool loaded_policy = false;
bool arm_reboot_watchdog = false;
- char *switch_root = NULL, *switch_root_init = NULL;
+ char *switch_root_dir = NULL, *switch_root_init = NULL;
#ifdef HAVE_SYSV_COMPAT
if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
@@ -1673,7 +1590,7 @@ int main(int argc, char *argv[]) {
case MANAGER_SWITCH_ROOT:
/* Steal the switch root parameters */
- switch_root = m->switch_root;
+ switch_root_dir = m->switch_root;
switch_root_init = m->switch_root_init;
m->switch_root = m->switch_root_init = NULL;
@@ -1728,8 +1645,11 @@ finish:
* rebooted while we do that */
watchdog_close(true);
- if (switch_root)
- do_switch_root(switch_root);
+ if (switch_root_dir) {
+ r = switch_root(switch_root_dir);
+ if (r < 0)
+ log_error("Failed to switch root, ignoring: %s", strerror(-r));
+ }
args_size = MAX(6, argc+1);
args = newa(const char*, args_size);
@@ -1750,7 +1670,7 @@ finish:
i = 0;
args[i++] = SYSTEMD_BINARY_PATH;
- if (switch_root)
+ if (switch_root_dir)
args[i++] = "--switchedroot";
args[i++] = arg_running_as == MANAGER_SYSTEM ? "--system" : "--user";
args[i++] = "--deserialize";