src/fsck.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <stdio.h>
  23 #include <stdbool.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28
  29 #include <libudev.h>
  30 #include <dbus/dbus.h>
  31
  32 #include "util.h"
  33 #include "dbus-common.h"
  34 #include "special.h"
  35 #include "bus-errors.h"
  36
  37 static bool arg_skip = false;
  38 static bool arg_force = false;
  39
  40 static void start_target(const char *target, bool isolate) {
  41         DBusMessage *m = NULL, *reply = NULL;
  42         DBusError error;
  43         const char *mode, *basic_target = "basic.target";
  44         DBusConnection *bus = NULL;
  45
  46         assert(target);
  47
  48         dbus_error_init(&error);
  49
  50         if (bus_connect(DBUS_BUS_SYSTEM, &bus, NULL, &error) < 0) {
  51                 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
  52                 goto finish;
  53         }
  54
  55         if (isolate)
  56                 mode = "isolate";
  57         else
  58                 mode = "replace";
  59
  60         log_debug("Running request %s/start/%s", target, mode);
  61
  62         if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnitReplace"))) {
  63                 log_error("Could not allocate message.");
  64                 goto finish;
  65         }
  66
  67         /* Start these units only if we can replace base.target with it */
  68
  69         if (!dbus_message_append_args(m,
  70                                       DBUS_TYPE_STRING, &basic_target,
  71                                       DBUS_TYPE_STRING, &target,
  72                                       DBUS_TYPE_STRING, &mode,
  73                                       DBUS_TYPE_INVALID)) {
  74                 log_error("Could not attach target and flag information to message.");
  75                 goto finish;
  76         }
  77
  78         if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
  79
  80                 /* Don't print a waring if we aren't called during
  81                  * startup */
  82                 if (!dbus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
  83                         log_error("Failed to start unit: %s", bus_error_message(&error));
  84
  85                 goto finish;
  86         }
  87
  88 finish:
  89         if (m)
  90                 dbus_message_unref(m);
  91
  92         if (reply)
  93                 dbus_message_unref(reply);
  94
  95         if (bus) {
  96                 dbus_connection_flush(bus);
  97                 dbus_connection_close(bus);
  98                 dbus_connection_unref(bus);
  99         }
 100
 101         dbus_error_free(&error);
 102 }
 103
 104 static int parse_proc_cmdline(void) {
 105         char *line, *w, *state;
 106         int r;
 107         size_t l;
 108
 109         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 110                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 111                 return 0;
 112         }
 113
 114         FOREACH_WORD_QUOTED(w, l, line, state) {
 115
 116                 if (strneq(w, "fsck.mode=auto", l))
 117                         arg_force = arg_skip = false;
 118                 else if (strneq(w, "fsck.mode=force", l))
 119                         arg_force = true;
 120                 else if (strneq(w, "fsck.mode=skip", l))
 121                         arg_skip = true;
 122                 else if (startswith(w, "fsck.mode"))
 123                         log_warning("Invalid fsck.mode= parameter. Ignoring.");
 124 #ifdef TARGET_FEDORA
 125                 else if (strneq(w, "fastboot", l))
 126                         arg_skip = true;
 127                 else if (strneq(w, "forcefsck", l))
 128                         arg_force = true;
 129 #endif
 130         }
 131
 132         free(line);
 133         return 0;
 134 }
 135
 136 static void test_files(void) {
 137         if (access("/fastboot", F_OK) >= 0)
 138                 arg_skip = true;
 139
 140         if (access("/forcefsck", F_OK) >= 0)
 141                 arg_force = true;
 142 }
 143
 144 int main(int argc, char *argv[]) {
 145         const char *cmdline[8];
 146         int i = 0, r = EXIT_FAILURE, q;
 147         pid_t pid;
 148         siginfo_t status;
 149         struct udev *udev = NULL;
 150         struct udev_device *udev_device = NULL;
 151         const char *device;
 152         bool root_directory;
 153
 154         if (argc > 2) {
 155                 log_error("This program expects one or no arguments.");
 156                 return EXIT_FAILURE;
 157         }
 158
 159         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 160         log_parse_environment();
 161         log_open();
 162
 163         parse_proc_cmdline();
 164         test_files();
 165
 166         if (!arg_force && arg_skip)
 167                 return 0;
 168
 169         if (argc > 1) {
 170                 device = argv[1];
 171                 root_directory = false;
 172         } else {
 173                 struct stat st;
 174                 struct timespec times[2];
 175
 176                 /* Find root device */
 177
 178                 if (stat("/", &st) < 0) {
 179                         log_error("Failed to stat() the root directory: %m");
 180                         goto finish;
 181                 }
 182
 183                 /* Virtual root devices don't need an fsck */
 184                 if (major(st.st_dev) == 0)
 185                         return 0;
 186
 187                 /* check if we are already writable */
 188                 times[0] = st.st_atim;
 189                 times[1] = st.st_mtim;
 190                 if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
 191                         log_info("Root directory is writable, skipping check.");
 192                         return 0;
 193                 }
 194
 195                 if (!(udev = udev_new())) {
 196                         log_error("Out of memory");
 197                         goto finish;
 198                 }
 199
 200                 if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev))) {
 201                         log_error("Failed to detect root device.");
 202                         goto finish;
 203                 }
 204
 205                 if (!(device = udev_device_get_devnode(udev_device))) {
 206                         log_error("Failed to detect device node of root directory.");
 207                         goto finish;
 208                 }
 209
 210                 root_directory = true;
 211         }
 212
 213         cmdline[i++] = "/sbin/fsck";
 214         cmdline[i++] = "-a";
 215         cmdline[i++] = "-T";
 216         cmdline[i++] = "-l";
 217
 218         if (!root_directory)
 219                 cmdline[i++] = "-M";
 220
 221         if (arg_force)
 222                 cmdline[i++] = "-f";
 223
 224         cmdline[i++] = device;
 225         cmdline[i++] = NULL;
 226
 227         if ((pid = fork()) < 0) {
 228                 log_error("fork(): %m");
 229                 goto finish;
 230         } else if (pid == 0) {
 231                 /* Child */
 232                 execv(cmdline[0], (char**) cmdline);
 233                 _exit(8); /* Operational error */
 234         }
 235
 236         if ((q = wait_for_terminate(pid, &status)) < 0) {
 237                 log_error("waitid(): %s", strerror(-q));
 238                 goto finish;
 239         }
 240
 241         if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
 242
 243                 if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
 244                         log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
 245                 else if (status.si_code == CLD_EXITED)
 246                         log_error("fsck failed with error code %i.", status.si_status);
 247                 else
 248                         log_error("fsck failed due to unknown reason.");
 249
 250                 if (status.si_code == CLD_EXITED && status.si_status & 2)
 251                         /* System should be rebooted. */
 252                         start_target(SPECIAL_REBOOT_TARGET, false);
 253                 else
 254                         /* Some other problem */
 255                         start_target(SPECIAL_EMERGENCY_TARGET, true);
 256
 257         } else
 258                 r = EXIT_SUCCESS;
 259
 260         if (status.si_code == CLD_EXITED && (status.si_status & 1))
 261                 touch("/dev/.systemd/quotacheck");
 262
 263 finish:
 264         if (udev_device)
 265                 udev_device_unref(udev_device);
 266
 267         if (udev)
 268                 udev_unref(udev);
 269
 270         return r;
 271 }