misc-utils/blkid.c

   1 /*
   2  * blkid.c - User command-line interface for libblkid
   3  *
   4  * Copyright (C) 2001 Andreas Dilger
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the
   8  * GNU Lesser General Public License.
   9  * %End-Header%
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <string.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <fcntl.h>
  19 #include <termios.h>
  20 #include <errno.h>
  21 #ifdef HAVE_SYS_IOCTL_H
  22 #include <sys/ioctl.h>
  23 #endif
  24 #ifdef HAVE_GETOPT_H
  25 #include <getopt.h>
  26 #else
  27 extern int getopt(int argc, char * const argv[], const char *optstring);
  28 extern char *optarg;
  29 extern int optind;
  30 #endif
  31
  32 #define OUTPUT_VALUE_ONLY       (1 << 1)
  33 #define OUTPUT_DEVICE_ONLY      (1 << 2)
  34 #define OUTPUT_PRETTY_LIST      (1 << 3)
  35 #define OUTPUT_UDEV_LIST        (1 << 4)
  36 #define OUTPUT_EXPORT_LIST      (1 << 5)
  37
  38 #define LOWPROBE_TOPOLOGY       (1 << 1)
  39 #define LOWPROBE_SUPERBLOCKS    (1 << 2)
  40
  41 #include <blkid.h>
  42
  43 #include "ismounted.h"
  44 #include "strutils.h"
  45
  46 const char *progname = "blkid";
  47
  48 int raw_chars;
  49
  50 static void print_version(FILE *out)
  51 {
  52         fprintf(out, "%s from %s (libblkid %s, %s)\n",
  53                 progname, PACKAGE_STRING, LIBBLKID_VERSION, LIBBLKID_DATE);
  54 }
  55
  56 static void usage(int error)
  57 {
  58         FILE *out = error ? stderr : stdout;
  59
  60         print_version(out);
  61         fprintf(out,
  62                 "Usage:\n"
  63                 " %1$s -L <label> | -U <uuid>\n\n"
  64                 " %1$s [-c <file>] [-ghlLv] [-o <format>] [-s <tag>] \n"
  65                 "       [-t <token>] [<dev> ...]\n\n"
  66                 " %1$s -p [-s <tag>] [-O <offset>] [-S <size>] \n"
  67                 "       [-o <format>] <dev> ...\n\n"
  68                 " %1$s -i [-s <tag>] [-o <format>] <dev> ...\n\n"
  69                 "Options:\n"
  70                 " -c <file>   read from <file> instead of reading from the default\n"
  71                 "               cache file (-c /dev/null means no cache)\n"
  72                 " -d          don't encode non-printing characters\n"
  73                 " -h          print this usage message and exit\n"
  74                 " -g          garbage collect the blkid cache\n"
  75                 " -o <format> output format; can be one of:\n"
  76                 "               value, device, list, udev, export or full; (default: full)\n"
  77                 " -k          list all known filesystems/RAIDs and exit\n"
  78                 " -s <tag>    show specified tag(s) (default show all tags)\n"
  79                 " -t <token>  find device with a specific token (NAME=value pair)\n"
  80                 " -l          look up only first device with token specified by -t\n"
  81                 " -L <label>  convert LABEL to device name\n"
  82                 " -U <uuid>   convert UUID to device name\n"
  83                 " -v          print version and exit\n"
  84                 " <dev>       specify device(s) to probe (default: all devices)\n\n"
  85                 "Low-level probing options:\n"
  86                 " -p          low-level superblocks probing (bypass cache)\n"
  87                 " -i          gather information about I/O limits\n"
  88                 " -S <size>   overwrite device size\n"
  89                 " -O <offset> probe at the given offset\n"
  90                 " -u <list>   filter by \"usage\" (e.g. -u filesystem,raid)\n"
  91                 " -n <list>   filter by filesystem type (e.g. -n vfat,ext3)\n"
  92                 "\n", progname);
  93
  94         exit(error);
  95 }
  96
  97 /*
  98  * This function does "safe" printing.  It will convert non-printable
  99  * ASCII characters using '^' and M- notation.
 100  */
 101 static void safe_print(const char *cp, int len)
 102 {
 103         unsigned char   ch;
 104
 105         if (len < 0)
 106                 len = strlen(cp);
 107
 108         while (len--) {
 109                 ch = *cp++;
 110                 if (!raw_chars) {
 111                         if (ch >= 128) {
 112                                 fputs("M-", stdout);
 113                                 ch -= 128;
 114                         }
 115                         if ((ch < 32) || (ch == 0x7f)) {
 116                                 fputc('^', stdout);
 117                                 ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
 118                         }
 119                 }
 120                 fputc(ch, stdout);
 121         }
 122 }
 123
 124 static int get_terminal_width(void)
 125 {
 126 #ifdef TIOCGSIZE
 127         struct ttysize  t_win;
 128 #endif
 129 #ifdef TIOCGWINSZ
 130         struct winsize  w_win;
 131 #endif
 132         const char      *cp;
 133
 134 #ifdef TIOCGSIZE
 135         if (ioctl (0, TIOCGSIZE, &t_win) == 0)
 136                 return (t_win.ts_cols);
 137 #endif
 138 #ifdef TIOCGWINSZ
 139         if (ioctl (0, TIOCGWINSZ, &w_win) == 0)
 140                 return (w_win.ws_col);
 141 #endif
 142         cp = getenv("COLUMNS");
 143         if (cp)
 144                 return strtol(cp, NULL, 10);
 145         return 80;
 146 }
 147
 148 static int pretty_print_word(const char *str, int max_len,
 149                              int left_len, int overflow_nl)
 150 {
 151         int len = strlen(str) + left_len;
 152         int ret = 0;
 153
 154         fputs(str, stdout);
 155         if (overflow_nl && len > max_len) {
 156                 fputc('\n', stdout);
 157                 len = 0;
 158         } else if (len > max_len)
 159                 ret = len - max_len;
 160         do
 161                 fputc(' ', stdout);
 162         while (len++ < max_len);
 163         return ret;
 164 }
 165
 166 static void pretty_print_line(const char *device, const char *fs_type,
 167                               const char *label, const char *mtpt,
 168                               const char *uuid)
 169 {
 170         static int device_len = 10, fs_type_len = 7;
 171         static int label_len = 8, mtpt_len = 14;
 172         static int term_width = -1;
 173         int len, w;
 174
 175         if (term_width < 0)
 176                 term_width = get_terminal_width();
 177
 178         if (term_width > 80) {
 179                 term_width -= 80;
 180                 w = term_width / 10;
 181                 if (w > 8)
 182                         w = 8;
 183                 term_width -= 2*w;
 184                 label_len += w;
 185                 fs_type_len += w;
 186                 w = term_width/2;
 187                 device_len += w;
 188                 mtpt_len +=w;
 189         }
 190
 191         len = pretty_print_word(device, device_len, 0, 1);
 192         len = pretty_print_word(fs_type, fs_type_len, len, 0);
 193         len = pretty_print_word(label, label_len, len, 0);
 194         pretty_print_word(mtpt, mtpt_len, len, 0);
 195
 196         fputs(uuid, stdout);
 197         fputc('\n', stdout);
 198 }
 199
 200 static void pretty_print_dev(blkid_dev dev)
 201 {
 202         blkid_tag_iterate       iter;
 203         const char              *type, *value, *devname;
 204         const char              *uuid = "", *fs_type = "", *label = "";
 205         int                     len, mount_flags;
 206         char                    mtpt[80];
 207         int                     retval;
 208
 209         if (dev == NULL) {
 210                 pretty_print_line("device", "fs_type", "label",
 211                                   "mount point", "UUID");
 212                 for (len=get_terminal_width()-1; len > 0; len--)
 213                         fputc('-', stdout);
 214                 fputc('\n', stdout);
 215                 return;
 216         }
 217
 218         devname = blkid_dev_devname(dev);
 219         if (access(devname, F_OK))
 220                 return;
 221
 222         /* Get the uuid, label, type */
 223         iter = blkid_tag_iterate_begin(dev);
 224         while (blkid_tag_next(iter, &type, &value) == 0) {
 225                 if (!strcmp(type, "UUID"))
 226                         uuid = value;
 227                 if (!strcmp(type, "TYPE"))
 228                         fs_type = value;
 229                 if (!strcmp(type, "LABEL"))
 230                         label = value;
 231         }
 232         blkid_tag_iterate_end(iter);
 233
 234         /* Get the mount point */
 235         mtpt[0] = 0;
 236         retval = check_mount_point(devname, &mount_flags, mtpt, sizeof(mtpt));
 237         if (retval == 0) {
 238                 if (mount_flags & MF_MOUNTED) {
 239                         if (!mtpt[0])
 240                                 strcpy(mtpt, "(mounted, mtpt unknown)");
 241                 } else if (mount_flags & MF_BUSY)
 242                         strcpy(mtpt, "(in use)");
 243                 else
 244                         strcpy(mtpt, "(not mounted)");
 245         }
 246
 247         pretty_print_line(devname, fs_type, label, mtpt, uuid);
 248 }
 249
 250 static void print_udev_format(const char *name, const char *value)
 251 {
 252         char enc[265], safe[256];
 253         size_t namelen = strlen(name);
 254
 255         *safe = *enc = '\0';
 256
 257         if (!strcmp(name, "TYPE") || !strcmp(name, "VERSION")) {
 258                 blkid_encode_string(value, enc, sizeof(enc));
 259                 printf("ID_FS_%s=%s\n", name, enc);
 260
 261         } else if (!strcmp(name, "UUID") ||
 262                  !strcmp(name, "LABEL") ||
 263                  !strcmp(name, "UUID_SUB")) {
 264
 265                 blkid_safe_string(value, safe, sizeof(safe));
 266                 printf("ID_FS_%s=%s\n", name, safe);
 267
 268                 blkid_encode_string(value, enc, sizeof(enc));
 269                 printf("ID_FS_%s_ENC=%s\n", name, enc);
 270
 271         } else if (!strcmp(name, "PTTYPE")) {
 272                 printf("ID_PART_TABLE_TYPE=%s\n", value);
 273
 274         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
 275                   !strcmp(name, "PART_ENTRY_TYPE")) {
 276
 277                 blkid_encode_string(value, enc, sizeof(enc));
 278                 printf("ID_%s=%s\n", name, enc);
 279
 280         } else if (!strncmp(name, "PART_ENTRY_", 11))
 281                 printf("ID_%s=%s\n", name, value);
 282
 283         else if (namelen >= 15 && (
 284                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
 285                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
 286                    !strcmp(name, "ALIGNMENT_OFFSET")))
 287                         printf("ID_IOLIMIT_%s=%s\n", name, value);
 288         else
 289                 printf("ID_FS_%s=%s\n", name, value);
 290 }
 291
 292 static int has_item(char *ary[], const char *item)
 293 {
 294         char **p;
 295
 296         for (p = ary; *p != NULL; p++)
 297                 if (!strcmp(item, *p))
 298                         return 1;
 299         return 0;
 300 }
 301
 302 static void print_value(int output, int num, const char *devname,
 303                         const char *value, const char *name, size_t valsz)
 304 {
 305         if (output & OUTPUT_VALUE_ONLY) {
 306                 fputs(value, stdout);
 307                 fputc('\n', stdout);
 308
 309         } else if (output & OUTPUT_UDEV_LIST) {
 310                 print_udev_format(name, value);
 311
 312         } else if (output & OUTPUT_EXPORT_LIST) {
 313                 if (num == 1 && devname)
 314                         printf("DEVNAME=%s\n", devname);
 315                 fputs(name, stdout);
 316                 fputs("=", stdout);
 317                 safe_print(value, valsz);
 318                 fputs("\n", stdout);
 319
 320         } else {
 321                 if (num == 1 && devname)
 322                         printf("%s: ", devname);
 323                 fputs(name, stdout);
 324                 fputs("=\"", stdout);
 325                 safe_print(value, valsz);
 326                 fputs("\" ", stdout);
 327         }
 328 }
 329
 330 static void print_tags(blkid_dev dev, char *show[], int output)
 331 {
 332         blkid_tag_iterate       iter;
 333         const char              *type, *value, *devname;
 334         int                     num = 1;
 335         static int              first = 1;
 336
 337         if (!dev)
 338                 return;
 339
 340         if (output & OUTPUT_PRETTY_LIST) {
 341                 pretty_print_dev(dev);
 342                 return;
 343         }
 344
 345         devname = blkid_dev_devname(dev);
 346
 347         if (output & OUTPUT_DEVICE_ONLY) {
 348                 printf("%s\n", devname);
 349                 return;
 350         }
 351
 352         iter = blkid_tag_iterate_begin(dev);
 353         while (blkid_tag_next(iter, &type, &value) == 0) {
 354                 if (show[0] && !has_item(show, type))
 355                         continue;
 356
 357                 if (num == 1 && !first &&
 358                     (output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 359                         /* add extra line between output from more devices */
 360                         fputc('\n', stdout);
 361
 362                 print_value(output, num++, devname, value, type, strlen(value));
 363         }
 364         blkid_tag_iterate_end(iter);
 365
 366         if (num > 1) {
 367                 if (!(output & (OUTPUT_VALUE_ONLY | OUTPUT_UDEV_LIST |
 368                                                 OUTPUT_EXPORT_LIST)))
 369                         printf("\n");
 370                 first = 0;
 371         }
 372 }
 373
 374
 375 static int append_str(char **res, size_t *sz, const char *a, const char *b)
 376 {
 377         char *str = *res;
 378         size_t asz = a ? strlen(a) : 0;
 379         size_t bsz = b ? strlen(b) : 0;
 380         size_t len = *sz + asz + bsz;
 381
 382         if (!len)
 383                 return -1;
 384
 385         str = realloc(str, len + 1);
 386         if (!str)
 387                 return -1;
 388
 389         *res = str;
 390         str += *sz;
 391
 392         if (a) {
 393                 memcpy(str, a, asz);
 394                 str += asz;
 395         }
 396         if (b) {
 397                 memcpy(str, b, bsz);
 398                 str += bsz;
 399         }
 400         *str = '\0';
 401         *sz = len;
 402         return 0;
 403 }
 404
 405 /*
 406  * Compose and print ID_FS_AMBIVALENT for udev
 407  */
 408 static int print_udev_ambivalent(blkid_probe pr)
 409 {
 410         char *val = NULL;
 411         size_t valsz = 0;
 412         int count = 0, rc = -1;
 413
 414         while (!blkid_do_probe(pr)) {
 415                 const char *usage = NULL, *type = NULL, *version = NULL;
 416                 char enc[256];
 417
 418                 blkid_probe_lookup_value(pr, "USAGE", &usage, NULL);
 419                 blkid_probe_lookup_value(pr, "TYPE", &type, NULL);
 420                 blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
 421
 422                 if (!usage || !type)
 423                         continue;
 424
 425                 blkid_encode_string(usage, enc, sizeof(enc));
 426                 if (append_str(&val, &valsz, enc, ":"))
 427                         goto done;
 428
 429                 blkid_encode_string(type, enc, sizeof(enc));
 430                 if (append_str(&val, &valsz, enc, version ? ":" : " "))
 431                         goto done;
 432
 433                 if (version) {
 434                         blkid_encode_string(version, enc, sizeof(enc));
 435                         if (append_str(&val, &valsz, enc, " "))
 436                                 goto done;
 437                 }
 438                 count++;
 439         }
 440
 441         if (count > 1) {
 442                 *(val + valsz - 1) = '\0';              /* rem tailing whitespace */
 443                 printf("ID_FS_AMBIVALEN=%s\n", val);
 444                 rc = 0;
 445         }
 446 done:
 447         free(val);
 448         return rc;
 449 }
 450
 451 static int lowprobe_superblocks(blkid_probe pr)
 452 {
 453         struct stat st;
 454         int rc, fd = blkid_probe_get_fd(pr);
 455
 456         if (fd < 0 || fstat(fd, &st))
 457                 return -1;
 458
 459         blkid_probe_enable_partitions(pr, 1);
 460
 461         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
 462             blkid_probe_is_wholedisk(pr)) {
 463                 /*
 464                  * check if the small disk is partitioned, if yes then
 465                  * don't probe for filesystems.
 466                  */
 467                 blkid_probe_enable_superblocks(pr, 0);
 468
 469                 rc = blkid_do_fullprobe(pr);
 470                 if (rc < 0)
 471                         return rc;      /* -1 = error, 1 = nothing, 0 = succes */
 472
 473                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 474                         return 0;       /* partition table detected */
 475         }
 476
 477         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 478         blkid_probe_enable_superblocks(pr, 1);
 479
 480         return blkid_do_safeprobe(pr);
 481 }
 482
 483 static int lowprobe_topology(blkid_probe pr)
 484 {
 485         /* enable topology probing only */
 486         blkid_probe_enable_topology(pr, 1);
 487
 488         blkid_probe_enable_superblocks(pr, 0);
 489         blkid_probe_enable_partitions(pr, 0);
 490
 491         return blkid_do_fullprobe(pr);
 492 }
 493
 494 static int lowprobe_device(blkid_probe pr, const char *devname,
 495                         int chain, char *show[], int output,
 496                         blkid_loff_t offset, blkid_loff_t size)
 497 {
 498         const char *data;
 499         const char *name;
 500         int nvals = 0, n, num = 1;
 501         size_t len;
 502         int fd;
 503         int rc = 0;
 504         static int first = 1;
 505
 506         fd = open(devname, O_RDONLY);
 507         if (fd < 0) {
 508                 fprintf(stderr, "error: %s: %m\n", devname);
 509                 return 2;
 510         }
 511         if (blkid_probe_set_device(pr, fd, offset, size))
 512                 goto done;
 513
 514         if (chain & LOWPROBE_TOPOLOGY)
 515                 rc = lowprobe_topology(pr);
 516         if (rc >= 0 && (chain & LOWPROBE_SUPERBLOCKS))
 517                 rc = lowprobe_superblocks(pr);
 518         if (rc < 0)
 519                 goto done;
 520
 521         if (!rc)
 522                 nvals = blkid_probe_numof_values(pr);
 523
 524         if (nvals &&
 525             !(chain & LOWPROBE_TOPOLOGY) &&
 526             !(output & OUTPUT_UDEV_LIST) &&
 527             !blkid_probe_has_value(pr, "TYPE") &&
 528             !blkid_probe_has_value(pr, "PTTYPE"))
 529                 /*
 530                  * Ignore probing result if there is not any filesystem or
 531                  * partition table on the device and udev output is not
 532                  * requested.
 533                  *
 534                  * The udev db stores information about partitions, so
 535                  * PART_ENTRY_* values are alway important.
 536                  */
 537                 nvals = 0;
 538
 539         if (nvals && !first && output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST))
 540                 /* add extra line between output from devices */
 541                 fputc('\n', stdout);
 542
 543         if (nvals && (output & OUTPUT_DEVICE_ONLY)) {
 544                 printf("%s\n", devname);
 545                 goto done;
 546         }
 547
 548         for (n = 0; n < nvals; n++) {
 549                 if (blkid_probe_get_value(pr, n, &name, &data, &len))
 550                         continue;
 551                 if (show[0] && !has_item(show, name))
 552                         continue;
 553                 len = strnlen((char *) data, len);
 554                 print_value(output, num++, devname, (char *) data, name, len);
 555         }
 556
 557         if (first)
 558                 first = 0;
 559         if (nvals >= 1 && !(output & (OUTPUT_VALUE_ONLY |
 560                                         OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 561                 printf("\n");
 562 done:
 563         if (rc == -2) {
 564                 if (output & OUTPUT_UDEV_LIST)
 565                         print_udev_ambivalent(pr);
 566                 else
 567                         fprintf(stderr,
 568                                 "%s: ambivalent result (probably more "
 569                                 "filesystems on the device, use wipefs(8) "
 570                                 "to see more details)\n",
 571                                 devname);
 572         }
 573         close(fd);
 574
 575         if (rc == -2)
 576                 return 8;       /* ambivalent probing result */
 577         if (!nvals)
 578                 return 2;       /* nothing detected */
 579
 580         return 0;               /* sucess */
 581 }
 582
 583 /* converts comma separated list to BLKID_USAGE_* mask */
 584 static int list_to_usage(const char *list, int *flag)
 585 {
 586         int mask = 0;
 587         const char *word = NULL, *p = list;
 588
 589         if (p && strncmp(p, "no", 2) == 0) {
 590                 *flag = BLKID_FLTR_NOTIN;
 591                 p += 2;
 592         }
 593         if (!p || !*p)
 594                 goto err;
 595         while(p) {
 596                 word = p;
 597                 p = strchr(p, ',');
 598                 if (p)
 599                         p++;
 600                 if (!strncmp(word, "filesystem", 10))
 601                         mask |= BLKID_USAGE_FILESYSTEM;
 602                 else if (!strncmp(word, "raid", 4))
 603                         mask |= BLKID_USAGE_RAID;
 604                 else if (!strncmp(word, "crypto", 6))
 605                         mask |= BLKID_USAGE_CRYPTO;
 606                 else if (!strncmp(word, "other", 5))
 607                         mask |= BLKID_USAGE_OTHER;
 608                 else
 609                         goto err;
 610         }
 611         return mask;
 612 err:
 613         *flag = 0;
 614         fprintf(stderr, "unknown kerword in -u <list> argument: '%s'\n",
 615                         word ? word : list);
 616         exit(4);
 617 }
 618
 619 /* converts comma separated list to types[] */
 620 static char **list_to_types(const char *list, int *flag)
 621 {
 622         int i;
 623         const char *p = list;
 624         char **res = NULL;
 625
 626         if (p && strncmp(p, "no", 2) == 0) {
 627                 *flag = BLKID_FLTR_NOTIN;
 628                 p += 2;
 629         }
 630         if (!p || !*p) {
 631                 fprintf(stderr, "error: -u <list> argument is empty\n");
 632                 goto err;
 633         }
 634         for (i = 1; p && (p = strchr(p, ',')); i++, p++);
 635
 636         res = calloc(i + 1, sizeof(char *));
 637         if (!res)
 638                 goto err_mem;
 639         p = *flag & BLKID_FLTR_NOTIN ? list + 2 : list;
 640         i = 0;
 641
 642         while(p) {
 643                 const char *word = p;
 644                 p = strchr(p, ',');
 645                 res[i] = p ? strndup(word, p - word) : strdup(word);
 646                 if (!res[i++])
 647                         goto err_mem;
 648                 if (p)
 649                         p++;
 650         }
 651         res[i] = NULL;
 652         return res;
 653 err_mem:
 654         fprintf(stderr, "out of memory\n");
 655 err:
 656         *flag = 0;
 657         free(res);
 658         exit(4);
 659 }
 660
 661 static void free_types_list(char *list[])
 662 {
 663         char **n;
 664
 665         if (!list)
 666                 return;
 667         for (n = list; *n; n++)
 668                 free(*n);
 669         free(list);
 670 }
 671
 672 int main(int argc, char **argv)
 673 {
 674         blkid_cache cache = NULL;
 675         char **devices = NULL;
 676         char *show[128] = { NULL, };
 677         char *search_type = NULL, *search_value = NULL;
 678         char *read = NULL;
 679         int fltr_usage = 0;
 680         char **fltr_type = NULL;
 681         int fltr_flag = BLKID_FLTR_ONLYIN;
 682         unsigned int numdev = 0, numtag = 0;
 683         int version = 0;
 684         int err = 4;
 685         unsigned int i;
 686         int output_format = 0;
 687         int lookup = 0, gc = 0, lowprobe = 0, eval = 0;
 688         int c;
 689         uintmax_t offset = 0, size = 0;
 690
 691         show[0] = NULL;
 692
 693         while ((c = getopt (argc, argv, "c:df:ghilL:n:ko:O:ps:S:t:u:U:w:v")) != EOF)
 694                 switch (c) {
 695                 case 'c':
 696                         if (optarg && !*optarg)
 697                                 read = NULL;
 698                         else
 699                                 read = optarg;
 700                         break;
 701                 case 'd':
 702                         raw_chars = 1;
 703                         break;
 704                 case 'L':
 705                         eval++;
 706                         search_value = strdup(optarg);
 707                         search_type = strdup("LABEL");
 708                         break;
 709                 case 'n':
 710                         if (fltr_usage) {
 711                                 fprintf(stderr, "error: -u and -n options are mutually exclusive\n");
 712                                 exit(4);
 713                         }
 714                         fltr_type = list_to_types(optarg, &fltr_flag);
 715                         break;
 716                 case 'u':
 717                         if (fltr_type) {
 718                                 fprintf(stderr, "error: -u and -n options are mutually exclusive\n");
 719                                 exit(4);
 720                         }
 721                         fltr_usage = list_to_usage(optarg, &fltr_flag);
 722                         break;
 723                 case 'U':
 724                         eval++;
 725                         search_value = strdup(optarg);
 726                         search_type = strdup("UUID");
 727                         break;
 728                 case 'i':
 729                         lowprobe |= LOWPROBE_TOPOLOGY;
 730                         break;
 731                 case 'l':
 732                         lookup++;
 733                         break;
 734                 case 'g':
 735                         gc = 1;
 736                         break;
 737                 case 'k':
 738                 {
 739                         size_t idx = 0;
 740                         const char *name = NULL;
 741
 742                         while (blkid_superblocks_get_name(idx++, &name, NULL) == 0)
 743                                 printf("%s\n", name);
 744                         exit(0);
 745                 }
 746                 case 'o':
 747                         if (!strcmp(optarg, "value"))
 748                                 output_format = OUTPUT_VALUE_ONLY;
 749                         else if (!strcmp(optarg, "device"))
 750                                 output_format = OUTPUT_DEVICE_ONLY;
 751                         else if (!strcmp(optarg, "list"))
 752                                 output_format = OUTPUT_PRETTY_LIST;
 753                         else if (!strcmp(optarg, "udev"))
 754                                 output_format = OUTPUT_UDEV_LIST;
 755                         else if (!strcmp(optarg, "export"))
 756                                 output_format = OUTPUT_EXPORT_LIST;
 757                         else if (!strcmp(optarg, "full"))
 758                                 output_format = 0;
 759                         else {
 760                                 fprintf(stderr, "Invalid output format %s. "
 761                                         "Choose from value,\n\t"
 762                                         "device, list, udev or full\n", optarg);
 763                                 exit(4);
 764                         }
 765                         break;
 766                 case 'O':
 767                         if (strtosize(optarg, &offset))
 768                                 fprintf(stderr,
 769                                         "Invalid offset '%s' specified\n",
 770                                         optarg);
 771                         break;
 772                 case 'p':
 773                         lowprobe |= LOWPROBE_SUPERBLOCKS;
 774                         break;
 775                 case 's':
 776                         if (numtag + 1 >= sizeof(show) / sizeof(*show)) {
 777                                 fprintf(stderr, "Too many tags specified\n");
 778                                 usage(err);
 779                         }
 780                         show[numtag++] = optarg;
 781                         show[numtag] = NULL;
 782                         break;
 783                 case 'S':
 784                         if (strtosize(optarg, &size))
 785                                 fprintf(stderr,
 786                                         "Invalid size '%s' specified\n",
 787                                         optarg);
 788                         break;
 789                 case 't':
 790                         if (search_type) {
 791                                 fprintf(stderr, "Can only search for "
 792                                                 "one NAME=value pair\n");
 793                                 usage(err);
 794                         }
 795                         if (blkid_parse_tag_string(optarg,
 796                                                    &search_type,
 797                                                    &search_value)) {
 798                                 fprintf(stderr, "-t needs NAME=value pair\n");
 799                                 usage(err);
 800                         }
 801                         break;
 802                 case 'v':
 803                         version = 1;
 804                         break;
 805                 case 'w':
 806                         /* ignore - backward compatibility */
 807                         break;
 808                 case 'h':
 809                         err = 0;
 810                         /* fallthrough */
 811                 default:
 812                         usage(err);
 813                 }
 814
 815
 816         /* The rest of the args are device names */
 817         if (optind < argc) {
 818                 devices = calloc(argc - optind, sizeof(char *));
 819                 if (!devices) {
 820                         fprintf(stderr, "Failed to allocate device name array\n");
 821                         goto exit;
 822                 }
 823
 824                 while (optind < argc)
 825                         devices[numdev++] = argv[optind++];
 826         }
 827
 828         if (version) {
 829                 print_version(stdout);
 830                 goto exit;
 831         }
 832
 833         /* convert LABEL/UUID lookup to evaluate request */
 834         if (lookup && output_format == OUTPUT_DEVICE_ONLY && search_type &&
 835             (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
 836                 eval++;
 837                 lookup = 0;
 838         }
 839
 840         if (!lowprobe && !eval && blkid_get_cache(&cache, read) < 0)
 841                 goto exit;
 842
 843         if (gc) {
 844                 blkid_gc_cache(cache);
 845                 err = 0;
 846                 goto exit;
 847         }
 848         err = 2;
 849
 850         if (eval == 0 && (output_format & OUTPUT_PRETTY_LIST)) {
 851                 if (lowprobe) {
 852                         fprintf(stderr, "The low-level probing mode does not "
 853                                         "support 'list' output format\n");
 854                         exit(4);
 855                 }
 856                 pretty_print_dev(NULL);
 857         }
 858
 859         if (lowprobe) {
 860                 /*
 861                  * Low-level API
 862                  */
 863                 blkid_probe pr;
 864
 865                 if (!numdev) {
 866                         fprintf(stderr, "The low-level probing mode "
 867                                         "requires a device\n");
 868                         exit(4);
 869                 }
 870
 871                 /* automatically enable 'export' format for I/O Limits */
 872                 if (!output_format  && (lowprobe & LOWPROBE_TOPOLOGY))
 873                         output_format = OUTPUT_EXPORT_LIST;
 874
 875                 pr = blkid_new_probe();
 876                 if (!pr)
 877                         goto exit;
 878
 879                 if (lowprobe & LOWPROBE_SUPERBLOCKS) {
 880                         blkid_probe_set_superblocks_flags(pr,
 881                                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 882                                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 883                                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 884
 885                         if (fltr_usage && blkid_probe_filter_superblocks_usage(
 886                                                 pr, fltr_flag, fltr_usage))
 887                                 goto exit;
 888
 889                         else if (fltr_type && blkid_probe_filter_superblocks_type(
 890                                                 pr, fltr_flag, fltr_type))
 891                                 goto exit;
 892                 }
 893
 894                 for (i = 0; i < numdev; i++)
 895                         err = lowprobe_device(pr, devices[i], lowprobe, show,
 896                                         output_format,
 897                                         (blkid_loff_t) offset,
 898                                         (blkid_loff_t) size);
 899                 blkid_free_probe(pr);
 900         } else if (eval) {
 901                 /*
 902                  * Evaluate API
 903                  */
 904                 char *res = blkid_evaluate_tag(search_type, search_value, NULL);
 905                 if (res) {
 906                         err = 0;
 907                         printf("%s\n", res);
 908                 }
 909         } else if (lookup) {
 910                 /*
 911                  * Classic (cache based) API
 912                  */
 913                 blkid_dev dev;
 914
 915                 if (!search_type) {
 916                         fprintf(stderr, "The lookup option requires a "
 917                                 "search type specified using -t\n");
 918                         exit(4);
 919                 }
 920                 /* Load any additional devices not in the cache */
 921                 for (i = 0; i < numdev; i++)
 922                         blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
 923
 924                 if ((dev = blkid_find_dev_with_tag(cache, search_type,
 925                                                    search_value))) {
 926                         print_tags(dev, show, output_format);
 927                         err = 0;
 928                 }
 929         /* If we didn't specify a single device, show all available devices */
 930         } else if (!numdev) {
 931                 blkid_dev_iterate       iter;
 932                 blkid_dev               dev;
 933
 934                 blkid_probe_all(cache);
 935
 936                 iter = blkid_dev_iterate_begin(cache);
 937                 blkid_dev_set_search(iter, search_type, search_value);
 938                 while (blkid_dev_next(iter, &dev) == 0) {
 939                         dev = blkid_verify(cache, dev);
 940                         if (!dev)
 941                                 continue;
 942                         print_tags(dev, show, output_format);
 943                         err = 0;
 944                 }
 945                 blkid_dev_iterate_end(iter);
 946         /* Add all specified devices to cache (optionally display tags) */
 947         } else for (i = 0; i < numdev; i++) {
 948                 blkid_dev dev = blkid_get_dev(cache, devices[i],
 949                                                   BLKID_DEV_NORMAL);
 950
 951                 if (dev) {
 952                         if (search_type &&
 953                             !blkid_dev_has_tag(dev, search_type,
 954                                                search_value))
 955                                 continue;
 956                         print_tags(dev, show, output_format);
 957                         err = 0;
 958                 }
 959         }
 960
 961 exit:
 962         free(search_type);
 963         free(search_value);
 964         free_types_list(fltr_type);
 965         if (!lowprobe && !eval)
 966                 blkid_put_cache(cache);
 967         free(devices);
 968         return err;
 969 }