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 #include "bus-errors.h"
  35
  36 static bool arg_skip = false;
  37 static bool arg_force = false;
  38
  39 static void start_target(const char *target, bool isolate) {
  40         DBusMessage *m = NULL, *reply = NULL;
  41         DBusError error;
  42         const char *mode, *basic_target = "basic.target";
  43         DBusConnection *bus = NULL;
  44
  45         assert(target);
  46
  47         dbus_error_init(&error);
  48
  49         if (bus_connect(DBUS_BUS_SYSTEM, &bus, NULL, &error) < 0) {
  50                 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
  51                 goto finish;
  52         }
  53
  54         if (isolate)
  55                 mode = "isolate";
  56         else
  57                 mode = "replace";
  58
  59         log_debug("Running request %s/start/%s", target, mode);
  60
  61         if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnitReplace"))) {
  62                 log_error("Could not allocate message.");
  63                 goto finish;
  64         }
  65
  66         /* Start these units only if we can replace base.target with it */
  67
  68         if (!dbus_message_append_args(m,
  69                                       DBUS_TYPE_STRING, &basic_target,
  70                                       DBUS_TYPE_STRING, &target,
  71                                       DBUS_TYPE_STRING, &mode,
  72                                       DBUS_TYPE_INVALID)) {
  73                 log_error("Could not attach target and flag information to message.");
  74                 goto finish;
  75         }
  76
  77         if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
  78
  79                 /* Don't print a waring if we aren't called during
  80                  * startup */
  81                 if (!dbus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
  82                         log_error("Failed to start unit: %s", bus_error_message(&error));
  83
  84                 goto finish;
  85         }
  86
  87 finish:
  88         if (m)
  89                 dbus_message_unref(m);
  90
  91         if (reply)
  92                 dbus_message_unref(reply);
  93
  94         if (bus) {
  95                 dbus_connection_flush(bus);
  96                 dbus_connection_close(bus);
  97                 dbus_connection_unref(bus);
  98         }
  99
 100         dbus_error_free(&error);
 101 }
 102
 103 static int parse_proc_cmdline(void) {
 104         char *line, *w, *state;
 105         int r;
 106         size_t l;
 107
 108         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 109                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 110                 return 0;
 111         }
 112
 113         FOREACH_WORD_QUOTED(w, l, line, state) {
 114
 115                 if (strneq(w, "fsck.mode=auto", l))
 116                         arg_force = arg_skip = false;
 117                 else if (strneq(w, "fsck.mode=force", l))
 118                         arg_force = true;
 119                 else if (strneq(w, "fsck.mode=skip", l))
 120                         arg_skip = true;
 121                 else if (startswith(w, "fsck.mode"))
 122                         log_warning("Invalid fsck.mode= parameter. Ignoring.");
 123 #ifdef TARGET_FEDORA
 124                 else if (strneq(w, "fastboot", l))
 125                         arg_skip = true;
 126                 else if (strneq(w, "forcefsck", l))
 127                         arg_force = true;
 128 #endif
 129         }
 130
 131         free(line);
 132         return 0;
 133 }
 134
 135 static void test_files(void) {
 136         if (access("/fastboot", F_OK) >= 0)
 137                 arg_skip = true;
 138
 139         if (access("/forcefsck", F_OK) >= 0)
 140                 arg_force = true;
 141 }
 142
 143 int main(int argc, char *argv[]) {
 144         const char *cmdline[7];
 145         int i = 0, r = EXIT_FAILURE, q;
 146         pid_t pid;
 147         siginfo_t status;
 148         struct udev *udev = NULL;
 149         struct udev_device *udev_device = NULL;
 150         const char *device;
 151         bool root_directory;
 152
 153         if (argc > 2) {
 154                 log_error("This program expects one or no arguments.");
 155                 return EXIT_FAILURE;
 156         }
 157
 158         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 159         log_parse_environment();
 160         log_open();
 161
 162         parse_proc_cmdline();
 163         test_files();
 164
 165         if (!arg_force && arg_skip)
 166                 return 0;
 167
 168         if (argc > 1) {
 169                 device = argv[1];
 170                 root_directory = false;
 171         } else {
 172                 struct stat st;
 173
 174                 /* Find root device */
 175
 176                 if (stat("/", &st) < 0) {
 177                         log_error("Failed to stat() the root directory: %m");
 178                         goto finish;
 179                 }
 180
 181                 /* Virtual root devices don't need an fsck */
 182                 if (major(st.st_dev) == 0)
 183                         return 0;
 184
 185                 if (!(udev = udev_new())) {
 186                         log_error("Out of memory");
 187                         goto finish;
 188                 }
 189
 190                 if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev))) {
 191                         log_error("Failed to detect root device.");
 192                         goto finish;
 193                 }
 194
 195                 if (!(device = udev_device_get_devnode(udev_device))) {
 196                         log_error("Failed to detect device node of root directory.");
 197                         goto finish;
 198                 }
 199
 200                 root_directory = true;
 201         }
 202
 203         cmdline[i++] = "/sbin/fsck";
 204         cmdline[i++] = "-a";
 205         cmdline[i++] = "-T";
 206
 207         if (!root_directory)
 208                 cmdline[i++] = "-M";
 209
 210         if (arg_force)
 211                 cmdline[i++] = "-f";
 212
 213         cmdline[i++] = device;
 214         cmdline[i++] = NULL;
 215
 216         if ((pid = fork()) < 0) {
 217                 log_error("fork(): %m");
 218                 goto finish;
 219         } else if (pid == 0) {
 220                 /* Child */
 221                 execv(cmdline[0], (char**) cmdline);
 222                 _exit(8); /* Operational error */
 223         }
 224
 225         if ((q = wait_for_terminate(pid, &status)) < 0) {
 226                 log_error("waitid(): %s", strerror(-q));
 227                 goto finish;
 228         }
 229
 230         if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
 231
 232                 if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
 233                         log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
 234                 else if (status.si_code == CLD_EXITED)
 235                         log_error("fsck failed with error code %i.", status.si_status);
 236                 else
 237                         log_error("fsck failed due to unknown reason.");
 238
 239                 if (status.si_code == CLD_EXITED && status.si_status & 2)
 240                         /* System should be rebooted. */
 241                         start_target(SPECIAL_REBOOT_TARGET, false);
 242                 else
 243                         /* Some other problem */
 244                         start_target(SPECIAL_EMERGENCY_TARGET, true);
 245
 246         } else
 247                 r = EXIT_SUCCESS;
 248
 249         if (status.si_code == CLD_EXITED && (status.si_status & 1))
 250                 touch("/dev/.systemd/quotacheck");
 251
 252 finish:
 253         if (udev_device)
 254                 udev_device_unref(udev_device);
 255
 256         if (udev)
 257                 udev_unref(udev);
 258
 259         return r;
 260 }