src/fsck/fsck.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2014 Holger Hans Peter Freyther
   4 ***/
   5
   6 #include <errno.h>
   7 #include <fcntl.h>
   8 #include <stdbool.h>
   9 #include <stdio.h>
  10 #include <sys/file.h>
  11 #include <sys/prctl.h>
  12 #include <sys/stat.h>
  13 #include <unistd.h>
  14
  15 #include "sd-bus.h"
  16 #include "sd-device.h"
  17
  18 #include "alloc-util.h"
  19 #include "bus-common-errors.h"
  20 #include "bus-error.h"
  21 #include "bus-util.h"
  22 #include "device-util.h"
  23 #include "fd-util.h"
  24 #include "fs-util.h"
  25 #include "parse-util.h"
  26 #include "path-util.h"
  27 #include "proc-cmdline.h"
  28 #include "process-util.h"
  29 #include "signal-util.h"
  30 #include "socket-util.h"
  31 #include "special.h"
  32 #include "stdio-util.h"
  33 #include "util.h"
  34
  35 /* exit codes as defined in fsck(8) */
  36 enum {
  37         FSCK_SUCCESS                 = 0,
  38         FSCK_ERROR_CORRECTED         = 1 << 0,
  39         FSCK_SYSTEM_SHOULD_REBOOT    = 1 << 1,
  40         FSCK_ERRORS_LEFT_UNCORRECTED = 1 << 2,
  41         FSCK_OPERATIONAL_ERROR       = 1 << 3,
  42         FSCK_USAGE_OR_SYNTAX_ERROR   = 1 << 4,
  43         FSCK_USER_CANCELLED          = 1 << 5,
  44         FSCK_SHARED_LIB_ERROR        = 1 << 7,
  45 };
  46
  47 static bool arg_skip = false;
  48 static bool arg_force = false;
  49 static bool arg_show_progress = false;
  50 static const char *arg_repair = "-a";
  51
  52 static void start_target(const char *target, const char *mode) {
  53         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
  54         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
  55         int r;
  56
  57         assert(target);
  58
  59         r = bus_connect_system_systemd(&bus);
  60         if (r < 0) {
  61                 log_error_errno(r, "Failed to get D-Bus connection: %m");
  62                 return;
  63         }
  64
  65         log_info("Running request %s/start/replace", target);
  66
  67         /* Start these units only if we can replace base.target with it */
  68         r = sd_bus_call_method(bus,
  69                                "org.freedesktop.systemd1",
  70                                "/org/freedesktop/systemd1",
  71                                "org.freedesktop.systemd1.Manager",
  72                                "StartUnitReplace",
  73                                &error,
  74                                NULL,
  75                                "sss", "basic.target", target, mode);
  76
  77         /* Don't print a warning if we aren't called during startup */
  78         if (r < 0 && !sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
  79                 log_error("Failed to start unit: %s", bus_error_message(&error, r));
  80 }
  81
  82 static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
  83         int r;
  84
  85         assert(key);
  86
  87         if (streq(key, "fsck.mode")) {
  88
  89                 if (proc_cmdline_value_missing(key, value))
  90                         return 0;
  91
  92                 if (streq(value, "auto"))
  93                         arg_force = arg_skip = false;
  94                 else if (streq(value, "force"))
  95                         arg_force = true;
  96                 else if (streq(value, "skip"))
  97                         arg_skip = true;
  98                 else
  99                         log_warning("Invalid fsck.mode= parameter '%s'. Ignoring.", value);
 100
 101         } else if (streq(key, "fsck.repair")) {
 102
 103                 if (proc_cmdline_value_missing(key, value))
 104                         return 0;
 105
 106                 if (streq(value, "preen"))
 107                         arg_repair = "-a";
 108                 else {
 109                         r = parse_boolean(value);
 110                         if (r > 0)
 111                                 arg_repair = "-y";
 112                         else if (r == 0)
 113                                 arg_repair = "-n";
 114                         else
 115                                 log_warning("Invalid fsck.repair= parameter '%s'. Ignoring.", value);
 116                 }
 117         }
 118
 119 #if HAVE_SYSV_COMPAT
 120         else if (streq(key, "fastboot") && !value) {
 121                 log_warning("Please pass 'fsck.mode=skip' rather than 'fastboot' on the kernel command line.");
 122                 arg_skip = true;
 123
 124         } else if (streq(key, "forcefsck") && !value) {
 125                 log_warning("Please pass 'fsck.mode=force' rather than 'forcefsck' on the kernel command line.");
 126                 arg_force = true;
 127         }
 128 #endif
 129
 130         return 0;
 131 }
 132
 133 static void test_files(void) {
 134
 135 #if HAVE_SYSV_COMPAT
 136         if (access("/fastboot", F_OK) >= 0) {
 137                 log_error("Please pass 'fsck.mode=skip' on the kernel command line rather than creating /fastboot on the root file system.");
 138                 arg_skip = true;
 139         }
 140
 141         if (access("/forcefsck", F_OK) >= 0) {
 142                 log_error("Please pass 'fsck.mode=force' on the kernel command line rather than creating /forcefsck on the root file system.");
 143                 arg_force = true;
 144         }
 145 #endif
 146
 147         arg_show_progress = access("/run/systemd/show-status", F_OK) >= 0;
 148 }
 149
 150 static double percent(int pass, unsigned long cur, unsigned long max) {
 151         /* Values stolen from e2fsck */
 152
 153         static const int pass_table[] = {
 154                 0, 70, 90, 92, 95, 100
 155         };
 156
 157         if (pass <= 0)
 158                 return 0.0;
 159
 160         if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
 161                 return 100.0;
 162
 163         return (double) pass_table[pass-1] +
 164                 ((double) pass_table[pass] - (double) pass_table[pass-1]) *
 165                 (double) cur / (double) max;
 166 }
 167
 168 static int process_progress(int fd) {
 169         _cleanup_fclose_ FILE *console = NULL, *f = NULL;
 170         usec_t last = 0;
 171         bool locked = false;
 172         int clear = 0, r;
 173
 174         /* No progress pipe to process? Then we are a NOP. */
 175         if (fd < 0)
 176                 return 0;
 177
 178         f = fdopen(fd, "re");
 179         if (!f) {
 180                 safe_close(fd);
 181                 return -errno;
 182         }
 183
 184         console = fopen("/dev/console", "we");
 185         if (!console)
 186                 return -ENOMEM;
 187
 188         for (;;) {
 189                 int pass, m;
 190                 unsigned long cur, max;
 191                 _cleanup_free_ char *device = NULL;
 192                 double p;
 193                 usec_t t;
 194
 195                 if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4) {
 196
 197                         if (ferror(f))
 198                                 r = log_warning_errno(errno, "Failed to read from progress pipe: %m");
 199                         else if (feof(f))
 200                                 r = 0;
 201                         else {
 202                                 log_warning("Failed to parse progress pipe data");
 203                                 r = -EBADMSG;
 204                         }
 205                         break;
 206                 }
 207
 208                 /* Only show one progress counter at max */
 209                 if (!locked) {
 210                         if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0)
 211                                 continue;
 212
 213                         locked = true;
 214                 }
 215
 216                 /* Only update once every 50ms */
 217                 t = now(CLOCK_MONOTONIC);
 218                 if (last + 50 * USEC_PER_MSEC > t)
 219                         continue;
 220
 221                 last = t;
 222
 223                 p = percent(pass, cur, max);
 224                 fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m);
 225                 fflush(console);
 226
 227                 if (m > clear)
 228                         clear = m;
 229         }
 230
 231         if (clear > 0) {
 232                 unsigned j;
 233
 234                 fputc('\r', console);
 235                 for (j = 0; j < (unsigned) clear; j++)
 236                         fputc(' ', console);
 237                 fputc('\r', console);
 238                 fflush(console);
 239         }
 240
 241         return r;
 242 }
 243
 244 static int fsck_progress_socket(void) {
 245         static const union sockaddr_union sa = {
 246                 .un.sun_family = AF_UNIX,
 247                 .un.sun_path = "/run/systemd/fsck.progress",
 248         };
 249
 250         _cleanup_close_ int fd = -1;
 251
 252         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 253         if (fd < 0)
 254                 return log_warning_errno(errno, "socket(): %m");
 255
 256         if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
 257                 return log_full_errno(IN_SET(errno, ECONNREFUSED, ENOENT) ? LOG_DEBUG : LOG_WARNING,
 258                                       errno, "Failed to connect to progress socket %s, ignoring: %m", sa.un.sun_path);
 259
 260         return TAKE_FD(fd);
 261 }
 262
 263 static int run(int argc, char *argv[]) {
 264         _cleanup_close_pair_ int progress_pipe[2] = { -1, -1 };
 265         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
 266         const char *device, *type;
 267         bool root_directory;
 268         struct stat st;
 269         int r, exit_status;
 270         pid_t pid;
 271
 272         log_set_target(LOG_TARGET_AUTO);
 273         log_parse_environment();
 274         log_open();
 275
 276         if (argc > 2) {
 277                 log_error("This program expects one or no arguments.");
 278                 return -EINVAL;
 279         }
 280
 281         umask(0022);
 282
 283         r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
 284         if (r < 0)
 285                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 286
 287         test_files();
 288
 289         if (!arg_force && arg_skip)
 290                 return 0;
 291
 292         if (argc > 1) {
 293                 device = argv[1];
 294
 295                 if (stat(device, &st) < 0)
 296                         return log_error_errno(errno, "Failed to stat %s: %m", device);
 297
 298                 if (!S_ISBLK(st.st_mode)) {
 299                         log_error("%s is not a block device.", device);
 300                         return -EINVAL;
 301                 }
 302
 303                 r = sd_device_new_from_devnum(&dev, 'b', st.st_rdev);
 304                 if (r < 0)
 305                         return log_error_errno(r, "Failed to detect device %s: %m", device);
 306
 307                 root_directory = false;
 308         } else {
 309                 struct timespec times[2];
 310
 311                 /* Find root device */
 312
 313                 if (stat("/", &st) < 0)
 314                         return log_error_errno(errno, "Failed to stat() the root directory: %m");
 315
 316                 /* Virtual root devices don't need an fsck */
 317                 if (major(st.st_dev) == 0) {
 318                         log_debug("Root directory is virtual or btrfs, skipping check.");
 319                         return 0;
 320                 }
 321
 322                 /* check if we are already writable */
 323                 times[0] = st.st_atim;
 324                 times[1] = st.st_mtim;
 325
 326                 if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
 327                         log_info("Root directory is writable, skipping check.");
 328                         return 0;
 329                 }
 330
 331                 r = sd_device_new_from_devnum(&dev, 'b', st.st_dev);
 332                 if (r < 0)
 333                         return log_error_errno(r, "Failed to detect root device: %m");
 334
 335                 r = sd_device_get_devname(dev, &device);
 336                 if (r < 0)
 337                         return log_device_error_errno(dev, r, "Failed to detect device node of root directory: %m");
 338
 339                 root_directory = true;
 340         }
 341
 342         if (sd_device_get_property_value(dev, "ID_FS_TYPE", &type) >= 0) {
 343                 r = fsck_exists(type);
 344                 if (r < 0)
 345                         log_device_warning_errno(dev, r, "Couldn't detect if fsck.%s may be used, proceeding: %m", type);
 346                 else if (r == 0) {
 347                         log_device_info(dev, "fsck.%s doesn't exist, not checking file system.", type);
 348                         return 0;
 349                 }
 350         }
 351
 352         if (arg_show_progress &&
 353             pipe(progress_pipe) < 0)
 354                 return log_error_errno(errno, "pipe(): %m");
 355
 356         r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
 357         if (r < 0)
 358                 return r;
 359         if (r == 0) {
 360                 char dash_c[STRLEN("-C") + DECIMAL_STR_MAX(int) + 1];
 361                 int progress_socket = -1;
 362                 const char *cmdline[9];
 363                 int i = 0;
 364
 365                 /* Child */
 366
 367                 /* Close the reading side of the progress pipe */
 368                 progress_pipe[0] = safe_close(progress_pipe[0]);
 369
 370                 /* Try to connect to a progress management daemon, if there is one */
 371                 progress_socket = fsck_progress_socket();
 372                 if (progress_socket >= 0) {
 373                         /* If this worked we close the progress pipe early, and just use the socket */
 374                         progress_pipe[1] = safe_close(progress_pipe[1]);
 375                         xsprintf(dash_c, "-C%i", progress_socket);
 376                 } else if (progress_pipe[1] >= 0) {
 377                         /* Otherwise if we have the progress pipe to our own local handle, we use it */
 378                         xsprintf(dash_c, "-C%i", progress_pipe[1]);
 379                 } else
 380                         dash_c[0] = 0;
 381
 382                 cmdline[i++] = "/sbin/fsck";
 383                 cmdline[i++] =  arg_repair;
 384                 cmdline[i++] = "-T";
 385
 386                 /*
 387                  * Since util-linux v2.25 fsck uses /run/fsck/<diskname>.lock files.
 388                  * The previous versions use flock for the device and conflict with
 389                  * udevd, see https://bugs.freedesktop.org/show_bug.cgi?id=79576#c5
 390                  */
 391                 cmdline[i++] = "-l";
 392
 393                 if (!root_directory)
 394                         cmdline[i++] = "-M";
 395
 396                 if (arg_force)
 397                         cmdline[i++] = "-f";
 398
 399                 if (!isempty(dash_c))
 400                         cmdline[i++] = dash_c;
 401
 402                 cmdline[i++] = device;
 403                 cmdline[i++] = NULL;
 404
 405                 execv(cmdline[0], (char**) cmdline);
 406                 _exit(FSCK_OPERATIONAL_ERROR);
 407         }
 408
 409         progress_pipe[1] = safe_close(progress_pipe[1]);
 410         (void) process_progress(TAKE_FD(progress_pipe[0]));
 411
 412         exit_status = wait_for_terminate_and_check("fsck", pid, WAIT_LOG_ABNORMAL);
 413         if (exit_status < 0)
 414                 return exit_status;
 415         if (exit_status & ~1) {
 416                 log_error("fsck failed with exit status %i.", exit_status);
 417
 418                 if ((exit_status & FSCK_SYSTEM_SHOULD_REBOOT) && root_directory) {
 419                         /* System should be rebooted. */
 420                         start_target(SPECIAL_REBOOT_TARGET, "replace-irreversibly");
 421                         return -EINVAL;
 422                 } else if (exit_status & (FSCK_SYSTEM_SHOULD_REBOOT | FSCK_ERRORS_LEFT_UNCORRECTED))
 423                         /* Some other problem */
 424                         start_target(SPECIAL_EMERGENCY_TARGET, "replace");
 425                 else
 426                         log_warning("Ignoring error.");
 427         }
 428
 429         if (exit_status & FSCK_ERROR_CORRECTED)
 430                 (void) touch("/run/systemd/quotacheck");
 431
 432         return exit_status & (FSCK_SYSTEM_SHOULD_REBOOT | FSCK_ERRORS_LEFT_UNCORRECTED);
 433 }
 434
 435 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);