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
  28 #include <libudev.h>
  29 #include <dbus/dbus.h>
  30
  31 #include "util.h"
  32 #include "dbus-common.h"
  33 #include "special.h"
  34
  35 static bool arg_skip = false;
  36 static bool arg_force = false;
  37
  38 static void start_target(const char *target, bool isolate) {
  39         DBusMessage *m = NULL, *reply = NULL;
  40         DBusError error;
  41         const char *mode, *base_target = "base.target";
  42         DBusConnection *bus = NULL;
  43
  44         assert(target);
  45
  46         dbus_error_init(&error);
  47
  48         if (bus_connect(DBUS_BUS_SYSTEM, &bus, NULL, &error) < 0) {
  49                 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
  50                 goto finish;
  51         }
  52
  53         if (isolate)
  54                 mode = "isolate";
  55         else
  56                 mode = "replace";
  57
  58         log_debug("Running request %s/start/%s", target, mode);
  59
  60         if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnitReplace"))) {
  61                 log_error("Could not allocate message.");
  62                 goto finish;
  63         }
  64
  65         /* Start these units only if we can replace base.target with it */
  66
  67         if (!dbus_message_append_args(m,
  68                                       DBUS_TYPE_STRING, &base_target,
  69                                       DBUS_TYPE_STRING, &target,
  70                                       DBUS_TYPE_STRING, &mode,
  71                                       DBUS_TYPE_INVALID)) {
  72                 log_error("Could not attach target and flag information to message.");
  73                 goto finish;
  74         }
  75
  76         if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
  77                 log_error("Failed to start unit: %s", bus_error_message(&error));
  78                 goto finish;
  79         }
  80
  81 finish:
  82         if (m)
  83                 dbus_message_unref(m);
  84
  85         if (reply)
  86                 dbus_message_unref(reply);
  87
  88         if (bus) {
  89                 dbus_connection_flush(bus);
  90                 dbus_connection_close(bus);
  91                 dbus_connection_unref(bus);
  92         }
  93
  94         dbus_error_free(&error);
  95 }
  96
  97 static int parse_proc_cmdline(void) {
  98         char *line, *w, *state;
  99         int r;
 100         size_t l;
 101
 102         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 103                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 104                 return 0;
 105         }
 106
 107         FOREACH_WORD_QUOTED(w, l, line, state) {
 108
 109                 if (strneq(w, "fsck.mode=auto", l))
 110                         arg_force = arg_skip = false;
 111                 else if (strneq(w, "fsck.mode=force", l))
 112                         arg_force = true;
 113                 else if (strneq(w, "fsck.mode=skip", l))
 114                         arg_skip = true;
 115                 else if (startswith(w, "fsck.mode"))
 116                         log_warning("Invalid fsck.mode= parameter. Ignoring.");
 117 #ifdef TARGET_FEDORA
 118                 else if (strneq(w, "fastboot", l))
 119                         arg_skip = true;
 120                 else if (strneq(w, "forcefsck", l))
 121                         arg_force = true;
 122 #endif
 123         }
 124
 125         free(line);
 126         return 0;
 127 }
 128
 129 static void test_files(void) {
 130         if (access("/fastboot", F_OK) >= 0)
 131                 arg_skip = true;
 132
 133         if (access("/forcefsck", F_OK) >= 0)
 134                 arg_force = true;
 135 }
 136
 137 int main(int argc, char *argv[]) {
 138         const char *cmdline[8];
 139         int i = 0, r = EXIT_FAILURE, q;
 140         pid_t pid;
 141         siginfo_t status;
 142         struct udev *udev = NULL;
 143         struct udev_device *udev_device = NULL;
 144         const char *device;
 145         bool root_directory;
 146
 147         if (argc > 2) {
 148                 log_error("This program expects one or no arguments.");
 149                 return EXIT_FAILURE;
 150         }
 151
 152         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 153         log_parse_environment();
 154         log_open();
 155
 156         parse_proc_cmdline();
 157         test_files();
 158
 159         if (!arg_force && arg_skip)
 160                 return 0;
 161
 162         if (argc > 1) {
 163                 device = argv[1];
 164                 root_directory = false;
 165         } else {
 166                 struct stat st;
 167
 168                 /* Find root device */
 169
 170                 if (stat("/", &st) < 0) {
 171                         log_error("Failed to stat() the root directory: %m");
 172                         goto finish;
 173                 }
 174
 175                 /* Virtual root devices don't need an fsck */
 176                 if (major(st.st_dev) == 0)
 177                         return 0;
 178
 179                 if (!(udev = udev_new())) {
 180                         log_error("Out of memory");
 181                         goto finish;
 182                 }
 183
 184                 if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev))) {
 185                         log_error("Failed to detect root device.");
 186                         goto finish;
 187                 }
 188
 189                 if (!(device = udev_device_get_devnode(udev_device))) {
 190                         log_error("Failed to detect device node of root directory.");
 191                         goto finish;
 192                 }
 193
 194                 root_directory = true;
 195         }
 196
 197         cmdline[i++] = "/sbin/fsck";
 198         cmdline[i++] = "-a";
 199         cmdline[i++] = "-T";
 200         cmdline[i++] = "-C";
 201
 202         if (!root_directory)
 203                 cmdline[i++] = "-M";
 204
 205         if (arg_force)
 206                 cmdline[i++] = "-f";
 207
 208         cmdline[i++] = device;
 209         cmdline[i++] = NULL;
 210
 211         if ((pid = fork()) < 0) {
 212                 log_error("fork(): %m");
 213                 goto finish;
 214         } else if (pid == 0) {
 215                 /* Child */
 216                 execv(cmdline[0], (char**) cmdline);
 217                 _exit(8); /* Operational error */
 218         }
 219
 220         if ((q = wait_for_terminate(pid, &status)) < 0) {
 221                 log_error("waitid(): %s", strerror(-q));
 222                 goto finish;
 223         }
 224
 225         if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
 226
 227                 if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
 228                         log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
 229                 else if (status.si_code == CLD_EXITED)
 230                         log_error("fsck failed with error code %i.", status.si_status);
 231                 else
 232                         log_error("fsck failed due to unknown reason.");
 233
 234                 if (status.si_code == CLD_EXITED && status.si_status & 2)
 235                         /* System should be rebooted. */
 236                         start_target(SPECIAL_REBOOT_TARGET, false);
 237                 else
 238                         /* Some other problem */
 239                         start_target(SPECIAL_EMERGENCY_TARGET, true);
 240
 241         } else
 242                 r = EXIT_SUCCESS;
 243
 244         if (status.si_code == CLD_EXITED && (status.si_status & 1))
 245                 touch("/dev/.systemd/quotacheck");
 246
 247 finish:
 248         if (udev_device)
 249                 udev_device_unref(udev_device);
 250
 251         if (udev)
 252                 udev_unref(udev);
 253
 254         return r;
 255 }