diff options
Diffstat (limited to 'src/systemd-remount-fs/remount-fs.c')
| -rw-r--r-- | src/systemd-remount-fs/remount-fs.c | 155 |
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..d7dac1c1e6 --- /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, 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; +} |