src/fsck/fsck.c

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