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/* SPDX-License-Identifier: LGPL-2.1+ */
#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 "main-func.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 */
static int run(int argc, char *argv[]) {
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
_cleanup_endmntent_ FILE *f = NULL;
struct mntent* me;
int r;
log_setup_service();
if (argc > 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program takes no arguments.");
umask(0022);
f = setmntent("/etc/fstab", "re");
if (!f) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open /etc/fstab: %m");
}
pids = hashmap_new(NULL);
if (!pids)
return log_oom();
while ((me = getmntent(f))) {
_cleanup_free_ char *s = NULL;
pid_t pid;
int k;
/* 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);
r = safe_fork("(remount)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
if (r < 0)
return r;
if (r == 0) {
/* Child */
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)
return log_oom();
k = hashmap_put(pids, PID_TO_PTR(pid), s);
if (k < 0)
return log_oom();
TAKE_PTR(s);
}
r = 0;
while (!hashmap_isempty(pids)) {
siginfo_t si = {};
_cleanup_free_ char *s = NULL;
if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
if (errno == EINTR)
continue;
return log_error_errno(errno, "waitid() failed: %m");
}
s = hashmap_remove(pids, PID_TO_PTR(si.si_pid));
if (s &&
!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;
}
}
return r;
}
DEFINE_MAIN_FUNCTION(run);
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