153 lines
4.7 KiB
C
153 lines
4.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <mntent.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 "env-util.h"
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#include "exit-status.h"
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#include "fstab-util.h"
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#include "log.h"
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#include "main-func.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 options that are in /etc/fstab that systemd
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* might not have respected */
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static int track_pid(Hashmap **h, const char *path, pid_t pid) {
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_cleanup_free_ char *c = NULL;
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int r;
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assert(h);
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assert(path);
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assert(pid_is_valid(pid));
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r = hashmap_ensure_allocated(h, NULL);
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if (r < 0)
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return log_oom();
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c = strdup(path);
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if (!c)
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return log_oom();
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r = hashmap_put(*h, PID_TO_PTR(pid), c);
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if (r < 0)
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return log_oom();
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TAKE_PTR(c);
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return 0;
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}
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static int do_remount(const char *path, bool force_rw, Hashmap **pids) {
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pid_t pid;
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int r;
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log_debug("Remounting %s...", path);
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r = safe_fork(force_rw ? "(remount-rw)" : "(remount)",
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FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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/* Child */
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execv(MOUNT_PATH,
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STRV_MAKE(MOUNT_PATH,
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path,
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"-o",
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force_rw ? "remount,rw" : "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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return track_pid(pids, path, pid);
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}
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static int run(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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bool has_root = false;
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struct mntent* me;
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int r;
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log_setup_service();
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if (argc > 1)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"This program takes no arguments.");
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umask(0022);
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f = setmntent(fstab_path(), "re");
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if (!f) {
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if (errno != ENOENT)
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return log_error_errno(errno, "Failed to open %s: %m", fstab_path());
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} else
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while ((me = getmntent(f))) {
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/* Remount the root fs, /usr, and all API VFSs */
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if (!mount_point_is_api(me->mnt_dir) &&
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!PATH_IN_SET(me->mnt_dir, "/", "/usr"))
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continue;
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if (path_equal(me->mnt_dir, "/"))
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has_root = true;
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r = do_remount(me->mnt_dir, false, &pids);
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if (r < 0)
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return r;
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}
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if (!has_root) {
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/* The $SYSTEMD_REMOUNT_ROOT_RW environment variable is set by systemd-gpt-auto-generator to tell us
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* whether to remount things. We honour it only if there's no explicit line in /etc/fstab configured
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* which takes precedence. */
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r = getenv_bool("SYSTEMD_REMOUNT_ROOT_RW");
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if (r < 0 && r != -ENXIO)
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log_warning_errno(r, "Failed to parse $SYSTEMD_REMOUNT_ROOT_RW, ignoring: %m");
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if (r > 0) {
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r = do_remount("/", true, &pids);
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if (r < 0)
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return r;
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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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_cleanup_free_ char *s = NULL;
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siginfo_t si = {};
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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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return log_error_errno(errno, "waitid() failed: %m");
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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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!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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}
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return r;
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}
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DEFINE_MAIN_FUNCTION(run);
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