summaryrefslogtreecommitdiff
path: root/src/systemd-remount-fs/remount-fs.c
diff options
context:
space:
mode:
authorLuke Shumaker <lukeshu@lukeshu.com>2017-05-12 23:58:59 -0400
committerLuke Shumaker <lukeshu@lukeshu.com>2017-05-12 23:58:59 -0400
commitf838f51c238f8dcc4568eb68a16a7a86024eea5d (patch)
treef122167057382ce448e3101091225ba6647592da /src/systemd-remount-fs/remount-fs.c
parent39970d85d4c2313d43147f15047ac564603c7f8c (diff)
./tools/notsd-move
Diffstat (limited to 'src/systemd-remount-fs/remount-fs.c')
-rw-r--r--src/systemd-remount-fs/remount-fs.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/src/systemd-remount-fs/remount-fs.c b/src/systemd-remount-fs/remount-fs.c
new file mode 100644
index 0000000000..90ae2688a2
--- /dev/null
+++ b/src/systemd-remount-fs/remount-fs.c
@@ -0,0 +1,155 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <mntent.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "core/mount-setup.h"
+#include "systemd-basic/exit-status.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/mount-util.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/signal-util.h"
+#include "systemd-basic/strv.h"
+#include "systemd-basic/util.h"
+
+/* Goes through /etc/fstab and remounts all API file systems, applying
+ * options that are in /etc/fstab that systemd might not have
+ * respected */
+
+int main(int argc, char *argv[]) {
+ _cleanup_hashmap_free_free_ Hashmap *pids = NULL;
+ _cleanup_endmntent_ FILE *f = NULL;
+ struct mntent* me;
+ int r;
+
+ if (argc > 1) {
+ log_error("This program takes no argument.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ f = setmntent("/etc/fstab", "r");
+ if (!f) {
+ if (errno == ENOENT) {
+ r = 0;
+ goto finish;
+ }
+
+ r = log_error_errno(errno, "Failed to open /etc/fstab: %m");
+ goto finish;
+ }
+
+ pids = hashmap_new(NULL);
+ if (!pids) {
+ r = log_oom();
+ goto finish;
+ }
+
+ while ((me = getmntent(f))) {
+ pid_t pid;
+ int k;
+ char *s;
+
+ /* Remount the root fs, /usr and all API VFS */
+ if (!mount_point_is_api(me->mnt_dir) &&
+ !path_equal(me->mnt_dir, "/") &&
+ !path_equal(me->mnt_dir, "/usr"))
+ continue;
+
+ log_debug("Remounting %s", me->mnt_dir);
+
+ pid = fork();
+ if (pid < 0) {
+ r = log_error_errno(errno, "Failed to fork: %m");
+ goto finish;
+ }
+
+ if (pid == 0) {
+ /* Child */
+
+ (void) reset_all_signal_handlers();
+ (void) reset_signal_mask();
+ (void) prctl(PR_SET_PDEATHSIG, SIGTERM);
+
+ execv(MOUNT_PATH, STRV_MAKE(MOUNT_PATH, me->mnt_dir, "-o", "remount"));
+
+ log_error_errno(errno, "Failed to execute " MOUNT_PATH ": %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ /* Parent */
+
+ s = strdup(me->mnt_dir);
+ if (!s) {
+ r = log_oom();
+ goto finish;
+ }
+
+ k = hashmap_put(pids, PID_TO_PTR(pid), s);
+ if (k < 0) {
+ free(s);
+ r = log_oom();
+ goto finish;
+ }
+ }
+
+ r = 0;
+ while (!hashmap_isempty(pids)) {
+ siginfo_t si = {};
+ char *s;
+
+ if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ r = log_error_errno(errno, "waitid() failed: %m");
+ goto finish;
+ }
+
+ s = hashmap_remove(pids, PID_TO_PTR(si.si_pid));
+ if (s) {
+ if (!is_clean_exit(si.si_code, si.si_status, EXIT_CLEAN_COMMAND, NULL)) {
+ if (si.si_code == CLD_EXITED)
+ log_error(MOUNT_PATH " for %s exited with exit status %i.", s, si.si_status);
+ else
+ log_error(MOUNT_PATH " for %s terminated by signal %s.", s, signal_to_string(si.si_status));
+
+ r = -ENOEXEC;
+ }
+
+ free(s);
+ }
+ }
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}