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 <dbus/dbus.h>
  29
  30 #include "util.h"
  31 #include "ac-power.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;
  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", "StartUnit"))) {
  61                 log_error("Could not allocate message.");
  62                 goto finish;
  63         }
  64
  65         if (!dbus_message_append_args(m,
  66                                       DBUS_TYPE_STRING, &target,
  67                                       DBUS_TYPE_STRING, &mode,
  68                                       DBUS_TYPE_INVALID)) {
  69                 log_error("Could not attach target and flag information to message.");
  70                 goto finish;
  71         }
  72
  73         if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
  74                 log_error("Failed to start unit: %s", bus_error_message(&error));
  75                 goto finish;
  76         }
  77
  78 finish:
  79         if (m)
  80                 dbus_message_unref(m);
  81
  82         if (reply)
  83                 dbus_message_unref(reply);
  84
  85         if (bus) {
  86                 dbus_connection_flush(bus);
  87                 dbus_connection_close(bus);
  88                 dbus_connection_unref(bus);
  89         }
  90
  91         dbus_error_free(&error);
  92 }
  93
  94 static int parse_proc_cmdline(void) {
  95         char *line, *w, *state;
  96         int r;
  97         size_t l;
  98
  99         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 100                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 101                 return 0;
 102         }
 103
 104         FOREACH_WORD_QUOTED(w, l, line, state) {
 105
 106                 if (strneq(w, "fsck.mode=auto", l))
 107                         arg_force = arg_skip = false;
 108                 else if (strneq(w, "fsck.mode=force", l))
 109                         arg_force = true;
 110                 else if (strneq(w, "fsck.mode=skip", l))
 111                         arg_skip = true;
 112                 else if (startswith(w, "fsck.mode"))
 113                         log_warning("Invalid fsck.mode= parameter. Ignoring.");
 114 #ifdef TARGET_FEDORA
 115                 else if (strneq(w, "fastboot", l))
 116                         arg_skip = true;
 117                 else if (strneq(w, "forcefsck", l))
 118                         arg_force = true;
 119 #endif
 120         }
 121
 122         free(line);
 123         return 0;
 124 }
 125
 126 static void test_files(void) {
 127         if (access("/fastboot", F_OK) >= 0)
 128                 arg_skip = true;
 129
 130         if (access("/forcefsck", F_OK) >= 0)
 131                 arg_force = true;
 132 }
 133
 134 int main(int argc, char *argv[]) {
 135         static const char * cmdline[7];
 136         int i = 0, r = EXIT_FAILURE, q;
 137         pid_t pid;
 138         siginfo_t status;
 139
 140         if (argc != 2) {
 141                 log_error("This program expects exactly one argument.");
 142                 return EXIT_FAILURE;
 143         }
 144
 145         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 146         log_parse_environment();
 147         log_open();
 148
 149         parse_proc_cmdline();
 150         test_files();
 151
 152         if (!arg_force) {
 153                 if (arg_skip)
 154                         return 0;
 155
 156                 /* FIXME: only execute necessary fsck's if no AC power present */
 157                 if (on_ac_power() == 0) {
 158                         log_info("Running on battery power, skipping file system check.");
 159                         return 0;
 160                 }
 161         }
 162
 163         cmdline[i++] = "/sbin/fsck";
 164         cmdline[i++] = "-a";
 165         cmdline[i++] = "-T";
 166         cmdline[i++] = "-C";
 167
 168         if (arg_force)
 169                 cmdline[i++] = "-f";
 170
 171         cmdline[i++] = argv[1];
 172         cmdline[i++] = NULL;
 173
 174         if ((pid = fork()) < 0) {
 175                 log_error("fork(): %m");
 176                 goto finish;
 177         } else if (pid == 0) {
 178                 /* Child */
 179                 execv(cmdline[0], (char**) cmdline);
 180                 _exit(8); /* Operational error */
 181         }
 182
 183         if ((q = wait_for_terminate(pid, &status)) < 0) {
 184                 log_error("waitid(): %s", strerror(-q));
 185                 goto finish;
 186         }
 187
 188         if (status.si_code == CLD_KILLED ||
 189             status.si_code == CLD_DUMPED) {
 190                 log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
 191                 goto finish;
 192
 193         } else if (status.si_code != CLD_EXITED) {
 194                 log_error("fsck failed due to unknown reason.");
 195                 goto finish;
 196         }
 197
 198         if (status.si_status & ~1) {
 199
 200                 if (access("/dev/.systemd/late-fsck", F_OK) >= 0) {
 201                         log_error("fsck failed with error code %i.", status.si_status);
 202                         goto finish;
 203                 }
 204
 205                 if (status.si_status & 2)
 206                         /* System should be rebooted. */
 207                         start_target(SPECIAL_REBOOT_TARGET, false);
 208                 else
 209                         /* Some other problem */
 210                         start_target(SPECIAL_EMERGENCY_TARGET, true);
 211
 212         } else
 213                 r = EXIT_SUCCESS;
 214
 215         if (status.si_status & 1)
 216                 touch("/dev/.systemd/quotacheck");
 217
 218 finish:
 219         return r;
 220 }