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/***
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 "exit-status.h"
#include "log.h"
#include "mount-setup.h"
#include "mount-util.h"
#include "path-util.h"
#include "process-util.h"
#include "signal-util.h"
#include "strv.h"
#include "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, 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;
}
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