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