./tools/notsd-move

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..90ae2688a2
--- /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, 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;
+                        }
+
+                        free(s);
+                }
+        }
+
+finish:
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}