/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 <unistd.h> #include <errno.h> #include <string.h> #include <sys/stat.h> #include <sys/wait.h> #include <mntent.h> #include "log.h" #include "util.h" #include "path-util.h" #include "signal-util.h" #include "mount-setup.h" #include "exit-status.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[]) { int ret = EXIT_FAILURE; _cleanup_endmntent_ FILE *f = NULL; struct mntent* me; Hashmap *pids = NULL; 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) return EXIT_SUCCESS; log_error_errno(errno, "Failed to open /etc/fstab: %m"); return EXIT_FAILURE; } pids = hashmap_new(NULL); if (!pids) { log_error("Failed to allocate set"); goto finish; } ret = EXIT_SUCCESS; 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) { log_error_errno(errno, "Failed to fork: %m"); ret = EXIT_FAILURE; continue; } if (pid == 0) { const char *arguments[5]; /* Child */ (void) reset_all_signal_handlers(); (void) reset_signal_mask(); arguments[0] = MOUNT_PATH; arguments[1] = me->mnt_dir; arguments[2] = "-o"; arguments[3] = "remount"; arguments[4] = NULL; execv(MOUNT_PATH, (char **) arguments); log_error_errno(errno, "Failed to execute " MOUNT_PATH ": %m"); _exit(EXIT_FAILURE); } /* Parent */ s = strdup(me->mnt_dir); if (!s) { log_oom(); ret = EXIT_FAILURE; continue; } k = hashmap_put(pids, UINT_TO_PTR(pid), s); if (k < 0) { log_error_errno(k, "Failed to add PID to set: %m"); ret = EXIT_FAILURE; continue; } } while (!hashmap_isempty(pids)) { siginfo_t si = {}; char *s; if (waitid(P_ALL, 0, &si, WEXITED) < 0) { if (errno == EINTR) continue; log_error_errno(errno, "waitid() failed: %m"); ret = EXIT_FAILURE; break; } s = hashmap_remove(pids, UINT_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)); ret = EXIT_FAILURE; } free(s); } } finish: if (pids) hashmap_free_free(pids); return ret; }