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 <errno.h>
  20 #include <getopt.h>
  21
  22 #define OUTPUT_VALUE_ONLY       (1 << 1)
  23 #define OUTPUT_DEVICE_ONLY      (1 << 2)
  24 #define OUTPUT_PRETTY_LIST      (1 << 3)                /* deprecated */
  25 #define OUTPUT_UDEV_LIST        (1 << 4)                /* deprecated */
  26 #define OUTPUT_EXPORT_LIST      (1 << 5)
  27
  28 #define LOWPROBE_TOPOLOGY       (1 << 1)
  29 #define LOWPROBE_SUPERBLOCKS    (1 << 2)
  30
  31 #define BLKID_EXIT_NOTFOUND     2       /* token or device not found */
  32 #define BLKID_EXIT_OTHER        4       /* bad usage or other error */
  33 #define BLKID_EXIT_AMBIVAL      8       /* ambivalent low-level probing detected */
  34
  35 #include <blkid.h>
  36
  37 #include "ismounted.h"
  38
  39 #define STRTOXX_EXIT_CODE       BLKID_EXIT_OTHER        /* strtoxx_or_err() */
  40 #include "strutils.h"
  41 #define OPTUTILS_EXIT_CODE      BLKID_EXIT_OTHER        /* exclusive_option() */
  42 #include "optutils.h"
  43 #define CLOSE_EXIT_CODE         BLKID_EXIT_OTHER        /* close_stdout() */
  44 #include "closestream.h"
  45
  46 #include "ttyutils.h"
  47 #include "xalloc.h"
  48
  49 static int raw_chars;
  50
  51 static void print_version(FILE *out)
  52 {
  53         fprintf(out, "%s from %s  (libblkid %s, %s)\n",
  54                 program_invocation_short_name, PACKAGE_STRING,
  55                 LIBBLKID_VERSION, LIBBLKID_DATE);
  56 }
  57
  58 static void usage(int error)
  59 {
  60         FILE *out = error ? stderr : stdout;
  61
  62         print_version(out);
  63         fprintf(out,
  64                 "Usage:\n"
  65                 " %1$s -L <label> | -U <uuid>\n\n"
  66                 " %1$s [-c <file>] [-ghlLv] [-o <format>] [-s <tag>] \n"
  67                 "       [-t <token>] [<dev> ...]\n\n"
  68                 " %1$s -p [-s <tag>] [-O <offset>] [-S <size>] \n"
  69                 "       [-o <format>] <dev> ...\n\n"
  70                 " %1$s -i [-s <tag>] [-o <format>] <dev> ...\n\n"
  71                 "Options:\n"
  72                 " -c <file>   read from <file> instead of reading from the default\n"
  73                 "               cache file (-c /dev/null means no cache)\n"
  74                 " -d          don't encode non-printing characters\n"
  75                 " -h          print this usage message and exit\n"
  76                 " -g          garbage collect the blkid cache\n"
  77                 " -o <format> output format; can be one of:\n"
  78                 "               value, device, export or full; (default: full)\n"
  79                 " -k          list all known filesystems/RAIDs and exit\n"
  80                 " -s <tag>    show specified tag(s) (default show all tags)\n"
  81                 " -t <token>  find device with a specific token (NAME=value pair)\n"
  82                 " -l          look up only first device with token specified by -t\n"
  83                 " -L <label>  convert LABEL to device name\n"
  84                 " -U <uuid>   convert UUID to device name\n"
  85                 " -V          print version and exit\n"
  86                 " <dev>       specify device(s) to probe (default: all devices)\n\n"
  87                 "Low-level probing options:\n"
  88                 " -p          low-level superblocks probing (bypass cache)\n"
  89                 " -i          gather information about I/O limits\n"
  90                 " -S <size>   overwrite device size\n"
  91                 " -O <offset> probe at the given offset\n"
  92                 " -u <list>   filter by \"usage\" (e.g. -u filesystem,raid)\n"
  93                 " -n <list>   filter by filesystem type (e.g. -n vfat,ext3)\n"
  94                 "\n", program_invocation_short_name);
  95
  96         exit(error);
  97 }
  98
  99 /*
 100  * This function does "safe" printing.  It will convert non-printable
 101  * ASCII characters using '^' and M- notation.
 102  *
 103  * If 'esc' is defined then escape all chars from esc by \.
 104  */
 105 static void safe_print(const char *cp, int len, const char *esc)
 106 {
 107         unsigned char   ch;
 108
 109         if (len < 0)
 110                 len = strlen(cp);
 111
 112         while (len--) {
 113                 ch = *cp++;
 114                 if (!raw_chars) {
 115                         if (ch >= 128) {
 116                                 fputs("M-", stdout);
 117                                 ch -= 128;
 118                         }
 119                         if ((ch < 32) || (ch == 0x7f)) {
 120                                 fputc('^', stdout);
 121                                 ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
 122
 123                         } else if (esc && strchr(esc, ch))
 124                                 fputc('\\', stdout);
 125                 }
 126                 fputc(ch, stdout);
 127         }
 128 }
 129
 130 static int pretty_print_word(const char *str, int max_len,
 131                              int left_len, int overflow_nl)
 132 {
 133         int len = strlen(str) + left_len;
 134         int ret = 0;
 135
 136         fputs(str, stdout);
 137         if (overflow_nl && len > max_len) {
 138                 fputc('\n', stdout);
 139                 len = 0;
 140         } else if (len > max_len)
 141                 ret = len - max_len;
 142         do {
 143                 fputc(' ', stdout);
 144         } while (len++ < max_len);
 145         return ret;
 146 }
 147
 148 static void pretty_print_line(const char *device, const char *fs_type,
 149                               const char *label, const char *mtpt,
 150                               const char *uuid)
 151 {
 152         static int device_len = 10, fs_type_len = 7;
 153         static int label_len = 8, mtpt_len = 14;
 154         static int term_width = -1;
 155         int len, w;
 156
 157         if (term_width < 0) {
 158                 term_width = get_terminal_width(80);
 159         }
 160         if (term_width > 80) {
 161                 term_width -= 80;
 162                 w = term_width / 10;
 163                 if (w > 8)
 164                         w = 8;
 165                 term_width -= 2*w;
 166                 label_len += w;
 167                 fs_type_len += w;
 168                 w = term_width/2;
 169                 device_len += w;
 170                 mtpt_len +=w;
 171         }
 172
 173         len = pretty_print_word(device, device_len, 0, 1);
 174         len = pretty_print_word(fs_type, fs_type_len, len, 0);
 175         len = pretty_print_word(label, label_len, len, 0);
 176         pretty_print_word(mtpt, mtpt_len, len, 0);
 177
 178         fputs(uuid, stdout);
 179         fputc('\n', stdout);
 180 }
 181
 182 static void pretty_print_dev(blkid_dev dev)
 183 {
 184         blkid_tag_iterate       iter;
 185         const char              *type, *value, *devname;
 186         const char              *uuid = "", *fs_type = "", *label = "";
 187         int                     len, mount_flags;
 188         char                    mtpt[80];
 189         int                     retval;
 190
 191         if (dev == NULL) {
 192                 pretty_print_line("device", "fs_type", "label",
 193                                   "mount point", "UUID");
 194                 for (len=get_terminal_width(0)-1; len > 0; len--)
 195                         fputc('-', stdout);
 196                 fputc('\n', stdout);
 197                 return;
 198         }
 199
 200         devname = blkid_dev_devname(dev);
 201         if (access(devname, F_OK))
 202                 return;
 203
 204         /* Get the uuid, label, type */
 205         iter = blkid_tag_iterate_begin(dev);
 206         while (blkid_tag_next(iter, &type, &value) == 0) {
 207                 if (!strcmp(type, "UUID"))
 208                         uuid = value;
 209                 if (!strcmp(type, "TYPE"))
 210                         fs_type = value;
 211                 if (!strcmp(type, "LABEL"))
 212                         label = value;
 213         }
 214         blkid_tag_iterate_end(iter);
 215
 216         /* Get the mount point */
 217         mtpt[0] = 0;
 218         retval = check_mount_point(devname, &mount_flags, mtpt, sizeof(mtpt));
 219         if (retval == 0) {
 220                 if (mount_flags & MF_MOUNTED) {
 221                         if (!mtpt[0])
 222                                 strcpy(mtpt, "(mounted, mtpt unknown)");
 223                 } else if (mount_flags & MF_BUSY)
 224                         strcpy(mtpt, "(in use)");
 225                 else
 226                         strcpy(mtpt, "(not mounted)");
 227         }
 228
 229         pretty_print_line(devname, fs_type, label, mtpt, uuid);
 230 }
 231
 232 static void print_udev_format(const char *name, const char *value)
 233 {
 234         char enc[265], safe[256];
 235         size_t namelen = strlen(name);
 236
 237         *safe = *enc = '\0';
 238
 239         if (!strcmp(name, "TYPE") || !strcmp(name, "VERSION")) {
 240                 blkid_encode_string(value, enc, sizeof(enc));
 241                 printf("ID_FS_%s=%s\n", name, enc);
 242
 243         } else if (!strcmp(name, "UUID") ||
 244                  !strcmp(name, "LABEL") ||
 245                  !strcmp(name, "UUID_SUB")) {
 246
 247                 blkid_safe_string(value, safe, sizeof(safe));
 248                 printf("ID_FS_%s=%s\n", name, safe);
 249
 250                 blkid_encode_string(value, enc, sizeof(enc));
 251                 printf("ID_FS_%s_ENC=%s\n", name, enc);
 252
 253         } else if (!strcmp(name, "PTUUID")) {
 254                 printf("ID_PART_TABLE_UUID=%s\n", value);
 255
 256         } else if (!strcmp(name, "PTTYPE")) {
 257                 printf("ID_PART_TABLE_TYPE=%s\n", value);
 258
 259         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
 260                   !strcmp(name, "PART_ENTRY_TYPE")) {
 261
 262                 blkid_encode_string(value, enc, sizeof(enc));
 263                 printf("ID_%s=%s\n", name, enc);
 264
 265         } else if (!strncmp(name, "PART_ENTRY_", 11))
 266                 printf("ID_%s=%s\n", name, value);
 267
 268         else if (namelen >= 15 && (
 269                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
 270                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
 271                    !strcmp(name, "ALIGNMENT_OFFSET")))
 272                         printf("ID_IOLIMIT_%s=%s\n", name, value);
 273         else
 274                 printf("ID_FS_%s=%s\n", name, value);
 275 }
 276
 277 static int has_item(char *ary[], const char *item)
 278 {
 279         char **p;
 280
 281         for (p = ary; *p != NULL; p++)
 282                 if (!strcmp(item, *p))
 283                         return 1;
 284         return 0;
 285 }
 286
 287 static void print_value(int output, int num, const char *devname,
 288                         const char *value, const char *name, size_t valsz)
 289 {
 290         if (output & OUTPUT_VALUE_ONLY) {
 291                 fputs(value, stdout);
 292                 fputc('\n', stdout);
 293
 294         } else if (output & OUTPUT_UDEV_LIST) {
 295                 print_udev_format(name, value);
 296
 297         } else if (output & OUTPUT_EXPORT_LIST) {
 298                 if (num == 1 && devname)
 299                         printf("DEVNAME=%s\n", devname);
 300                 fputs(name, stdout);
 301                 fputs("=", stdout);
 302                 safe_print(value, valsz, " \\\"'$`<>");
 303                 fputs("\n", stdout);
 304
 305         } else {
 306                 if (num == 1 && devname)
 307                         printf("%s:", devname);
 308                 fputs(" ", stdout);
 309                 fputs(name, stdout);
 310                 fputs("=\"", stdout);
 311                 safe_print(value, valsz, "\"\\");
 312                 fputs("\"", stdout);
 313         }
 314 }
 315
 316 static void print_tags(blkid_dev dev, char *show[], int output)
 317 {
 318         blkid_tag_iterate       iter;
 319         const char              *type, *value, *devname;
 320         int                     num = 1;
 321         static int              first = 1;
 322
 323         if (!dev)
 324                 return;
 325
 326         if (output & OUTPUT_PRETTY_LIST) {
 327                 pretty_print_dev(dev);
 328                 return;
 329         }
 330
 331         devname = blkid_dev_devname(dev);
 332
 333         if (output & OUTPUT_DEVICE_ONLY) {
 334                 printf("%s\n", devname);
 335                 return;
 336         }
 337
 338         iter = blkid_tag_iterate_begin(dev);
 339         while (blkid_tag_next(iter, &type, &value) == 0) {
 340                 if (show[0] && !has_item(show, type))
 341                         continue;
 342
 343                 if (num == 1 && !first &&
 344                     (output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 345                         /* add extra line between output from more devices */
 346                         fputc('\n', stdout);
 347
 348                 print_value(output, num++, devname, value, type, strlen(value));
 349         }
 350         blkid_tag_iterate_end(iter);
 351
 352         if (num > 1) {
 353                 if (!(output & (OUTPUT_VALUE_ONLY | OUTPUT_UDEV_LIST |
 354                                                 OUTPUT_EXPORT_LIST)))
 355                         printf("\n");
 356                 first = 0;
 357         }
 358 }
 359
 360
 361 static int append_str(char **res, size_t *sz, const char *a, const char *b)
 362 {
 363         char *str = *res;
 364         size_t asz = a ? strlen(a) : 0;
 365         size_t bsz = b ? strlen(b) : 0;
 366         size_t len = *sz + asz + bsz;
 367
 368         if (!len)
 369                 return -1;
 370
 371         *res = str = xrealloc(str, len + 1);
 372         str += *sz;
 373
 374         if (a) {
 375                 memcpy(str, a, asz);
 376                 str += asz;
 377         }
 378         if (b) {
 379                 memcpy(str, b, bsz);
 380                 str += bsz;
 381         }
 382         *str = '\0';
 383         *sz = len;
 384         return 0;
 385 }
 386
 387 /*
 388  * Compose and print ID_FS_AMBIVALENT for udev
 389  */
 390 static int print_udev_ambivalent(blkid_probe pr)
 391 {
 392         char *val = NULL;
 393         size_t valsz = 0;
 394         int count = 0, rc = -1;
 395
 396         while (!blkid_do_probe(pr)) {
 397                 const char *usage_txt = NULL, *type = NULL, *version = NULL;
 398                 char enc[256];
 399
 400                 blkid_probe_lookup_value(pr, "USAGE", &usage_txt, NULL);
 401                 blkid_probe_lookup_value(pr, "TYPE", &type, NULL);
 402                 blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
 403
 404                 if (!usage_txt || !type)
 405                         continue;
 406
 407                 blkid_encode_string(usage_txt, enc, sizeof(enc));
 408                 if (append_str(&val, &valsz, enc, ":"))
 409                         goto done;
 410
 411                 blkid_encode_string(type, enc, sizeof(enc));
 412                 if (append_str(&val, &valsz, enc, version ? ":" : " "))
 413                         goto done;
 414
 415                 if (version) {
 416                         blkid_encode_string(version, enc, sizeof(enc));
 417                         if (append_str(&val, &valsz, enc, " "))
 418                                 goto done;
 419                 }
 420                 count++;
 421         }
 422
 423         if (count > 1) {
 424                 *(val + valsz - 1) = '\0';              /* rem tailing whitespace */
 425                 printf("ID_FS_AMBIVALENT=%s\n", val);
 426                 rc = 0;
 427         }
 428 done:
 429         free(val);
 430         return rc;
 431 }
 432
 433 static int lowprobe_superblocks(blkid_probe pr)
 434 {
 435         struct stat st;
 436         int rc, fd = blkid_probe_get_fd(pr);
 437
 438         if (fd < 0 || fstat(fd, &st))
 439                 return -1;
 440
 441         blkid_probe_enable_partitions(pr, 1);
 442
 443         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
 444             blkid_probe_is_wholedisk(pr)) {
 445                 /*
 446                  * check if the small disk is partitioned, if yes then
 447                  * don't probe for filesystems.
 448                  */
 449                 blkid_probe_enable_superblocks(pr, 0);
 450
 451                 rc = blkid_do_fullprobe(pr);
 452                 if (rc < 0)
 453                         return rc;      /* -1 = error, 1 = nothing, 0 = success */
 454
 455                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 456                         return 0;       /* partition table detected */
 457         }
 458
 459         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 460         blkid_probe_enable_superblocks(pr, 1);
 461
 462         return blkid_do_safeprobe(pr);
 463 }
 464
 465 static int lowprobe_topology(blkid_probe pr)
 466 {
 467         /* enable topology probing only */
 468         blkid_probe_enable_topology(pr, 1);
 469
 470         blkid_probe_enable_superblocks(pr, 0);
 471         blkid_probe_enable_partitions(pr, 0);
 472
 473         return blkid_do_fullprobe(pr);
 474 }
 475
 476 static int lowprobe_device(blkid_probe pr, const char *devname,
 477                         int chain, char *show[], int output,
 478                         uint64_t offset, uint64_t size)
 479 {
 480         const char *data;
 481         const char *name;
 482         int nvals = 0, n, num = 1;
 483         size_t len;
 484         int fd;
 485         int rc = 0;
 486         static int first = 1;
 487
 488         fd = open(devname, O_RDONLY|O_CLOEXEC);
 489         if (fd < 0) {
 490                 fprintf(stderr, "error: %s: %m\n", devname);
 491                 return BLKID_EXIT_NOTFOUND;
 492         }
 493         if (blkid_probe_set_device(pr, fd, offset, size))
 494                 goto done;
 495
 496         if (chain & LOWPROBE_TOPOLOGY)
 497                 rc = lowprobe_topology(pr);
 498         if (rc >= 0 && (chain & LOWPROBE_SUPERBLOCKS))
 499                 rc = lowprobe_superblocks(pr);
 500         if (rc < 0)
 501                 goto done;
 502
 503         if (!rc)
 504                 nvals = blkid_probe_numof_values(pr);
 505
 506         if (nvals && !first && output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST))
 507                 /* add extra line between output from devices */
 508                 fputc('\n', stdout);
 509
 510         if (nvals && (output & OUTPUT_DEVICE_ONLY)) {
 511                 printf("%s\n", devname);
 512                 goto done;
 513         }
 514
 515         for (n = 0; n < nvals; n++) {
 516                 if (blkid_probe_get_value(pr, n, &name, &data, &len))
 517                         continue;
 518                 if (show[0] && !has_item(show, name))
 519                         continue;
 520                 len = strnlen((char *) data, len);
 521                 print_value(output, num++, devname, (char *) data, name, len);
 522         }
 523
 524         if (first)
 525                 first = 0;
 526         if (nvals >= 1 && !(output & (OUTPUT_VALUE_ONLY |
 527                                         OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 528                 printf("\n");
 529 done:
 530         if (rc == -2) {
 531                 if (output & OUTPUT_UDEV_LIST)
 532                         print_udev_ambivalent(pr);
 533                 else
 534                         fprintf(stderr,
 535                                 "%s: ambivalent result (probably more "
 536                                 "filesystems on the device, use wipefs(8) "
 537                                 "to see more details)\n",
 538                                 devname);
 539         }
 540         close(fd);
 541
 542         if (rc == -2)
 543                 return BLKID_EXIT_AMBIVAL;      /* ambivalent probing result */
 544         if (!nvals)
 545                 return BLKID_EXIT_NOTFOUND;     /* nothing detected */
 546
 547         return 0;               /* success */
 548 }
 549
 550 /* converts comma separated list to BLKID_USAGE_* mask */
 551 static int list_to_usage(const char *list, int *flag)
 552 {
 553         int mask = 0;
 554         const char *word = NULL, *p = list;
 555
 556         if (p && strncmp(p, "no", 2) == 0) {
 557                 *flag = BLKID_FLTR_NOTIN;
 558                 p += 2;
 559         }
 560         if (!p || !*p)
 561                 goto err;
 562         while(p) {
 563                 word = p;
 564                 p = strchr(p, ',');
 565                 if (p)
 566                         p++;
 567                 if (!strncmp(word, "filesystem", 10))
 568                         mask |= BLKID_USAGE_FILESYSTEM;
 569                 else if (!strncmp(word, "raid", 4))
 570                         mask |= BLKID_USAGE_RAID;
 571                 else if (!strncmp(word, "crypto", 6))
 572                         mask |= BLKID_USAGE_CRYPTO;
 573                 else if (!strncmp(word, "other", 5))
 574                         mask |= BLKID_USAGE_OTHER;
 575                 else
 576                         goto err;
 577         }
 578         return mask;
 579 err:
 580         *flag = 0;
 581         fprintf(stderr, "unknown keyword in -u <list> argument: '%s'\n",
 582                         word ? word : list);
 583         exit(BLKID_EXIT_OTHER);
 584 }
 585
 586 /* converts comma separated list to types[] */
 587 static char **list_to_types(const char *list, int *flag)
 588 {
 589         int i;
 590         const char *p = list;
 591         char **res = NULL;
 592
 593         if (p && strncmp(p, "no", 2) == 0) {
 594                 *flag = BLKID_FLTR_NOTIN;
 595                 p += 2;
 596         }
 597         if (!p || !*p) {
 598                 fprintf(stderr, "error: -u <list> argument is empty\n");
 599                 goto err;
 600         }
 601         for (i = 1; p && (p = strchr(p, ',')); i++, p++);
 602
 603         res = xcalloc(i + 1, sizeof(char *));
 604         p = *flag & BLKID_FLTR_NOTIN ? list + 2 : list;
 605         i = 0;
 606
 607         while(p) {
 608                 const char *word = p;
 609                 p = strchr(p, ',');
 610                 res[i++] = p ? xstrndup(word, p - word) : xstrdup(word);
 611                 if (p)
 612                         p++;
 613         }
 614         res[i] = NULL;
 615         return res;
 616 err:
 617         *flag = 0;
 618         free(res);
 619         exit(BLKID_EXIT_OTHER);
 620 }
 621
 622 static void free_types_list(char *list[])
 623 {
 624         char **n;
 625
 626         if (!list)
 627                 return;
 628         for (n = list; *n; n++)
 629                 free(*n);
 630         free(list);
 631 }
 632
 633 int main(int argc, char **argv)
 634 {
 635         blkid_cache cache = NULL;
 636         char **devices = NULL;
 637         char *show[128] = { NULL, };
 638         char *search_type = NULL, *search_value = NULL;
 639         char *read = NULL;
 640         int fltr_usage = 0;
 641         char **fltr_type = NULL;
 642         int fltr_flag = BLKID_FLTR_ONLYIN;
 643         unsigned int numdev = 0, numtag = 0;
 644         int version = 0;
 645         int err = BLKID_EXIT_OTHER;
 646         unsigned int i;
 647         int output_format = 0;
 648         int lookup = 0, gc = 0, lowprobe = 0, eval = 0;
 649         int c;
 650         uintmax_t offset = 0, size = 0;
 651
 652         static const ul_excl_t excl[] = {       /* rows and cols in ASCII order */
 653                 { 'n','u' },
 654                 { 0 }
 655         };
 656         int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
 657
 658         show[0] = NULL;
 659         atexit(close_stdout);
 660
 661         while ((c = getopt (argc, argv,
 662                             "c:df:ghilL:n:ko:O:ps:S:t:u:U:w:Vv")) != EOF) {
 663
 664                 err_exclusive_options(c, NULL, excl, excl_st);
 665
 666                 switch (c) {
 667                 case 'c':
 668                         if (optarg && !*optarg)
 669                                 read = NULL;
 670                         else
 671                                 read = optarg;
 672                         break;
 673                 case 'd':
 674                         raw_chars = 1;
 675                         break;
 676                 case 'L':
 677                         eval++;
 678                         search_value = xstrdup(optarg);
 679                         search_type = xstrdup("LABEL");
 680                         break;
 681                 case 'n':
 682                         fltr_type = list_to_types(optarg, &fltr_flag);
 683                         break;
 684                 case 'u':
 685                         fltr_usage = list_to_usage(optarg, &fltr_flag);
 686                         break;
 687                 case 'U':
 688                         eval++;
 689                         search_value = xstrdup(optarg);
 690                         search_type = xstrdup("UUID");
 691                         break;
 692                 case 'i':
 693                         lowprobe |= LOWPROBE_TOPOLOGY;
 694                         break;
 695                 case 'l':
 696                         lookup++;
 697                         break;
 698                 case 'g':
 699                         gc = 1;
 700                         break;
 701                 case 'k':
 702                 {
 703                         size_t idx = 0;
 704                         const char *name = NULL;
 705
 706                         while (blkid_superblocks_get_name(idx++, &name, NULL) == 0)
 707                                 printf("%s\n", name);
 708                         exit(EXIT_SUCCESS);
 709                 }
 710                 case 'o':
 711                         if (!strcmp(optarg, "value"))
 712                                 output_format = OUTPUT_VALUE_ONLY;
 713                         else if (!strcmp(optarg, "device"))
 714                                 output_format = OUTPUT_DEVICE_ONLY;
 715                         else if (!strcmp(optarg, "list"))
 716                                 output_format = OUTPUT_PRETTY_LIST;     /* deprecated */
 717                         else if (!strcmp(optarg, "udev"))
 718                                 output_format = OUTPUT_UDEV_LIST;
 719                         else if (!strcmp(optarg, "export"))
 720                                 output_format = OUTPUT_EXPORT_LIST;
 721                         else if (!strcmp(optarg, "full"))
 722                                 output_format = 0;
 723                         else {
 724                                 fprintf(stderr, "Invalid output format %s. "
 725                                         "Choose from value,\n\t"
 726                                         "device, list, udev or full\n", optarg);
 727                                 exit(BLKID_EXIT_OTHER);
 728                         }
 729                         break;
 730                 case 'O':
 731                         offset = strtosize_or_err(optarg, "invalid offset argument");
 732                         break;
 733                 case 'p':
 734                         lowprobe |= LOWPROBE_SUPERBLOCKS;
 735                         break;
 736                 case 's':
 737                         if (numtag + 1 >= sizeof(show) / sizeof(*show)) {
 738                                 fprintf(stderr, "Too many tags specified\n");
 739                                 usage(err);
 740                         }
 741                         show[numtag++] = optarg;
 742                         show[numtag] = NULL;
 743                         break;
 744                 case 'S':
 745                         size = strtosize_or_err(optarg, "invalid size argument");
 746                         break;
 747                 case 't':
 748                         if (search_type) {
 749                                 fprintf(stderr, "Can only search for "
 750                                                 "one NAME=value pair\n");
 751                                 usage(err);
 752                         }
 753                         if (blkid_parse_tag_string(optarg,
 754                                                    &search_type,
 755                                                    &search_value)) {
 756                                 fprintf(stderr, "-t needs NAME=value pair\n");
 757                                 usage(err);
 758                         }
 759                         break;
 760                 case 'V':
 761                 case 'v':
 762                         version = 1;
 763                         break;
 764                 case 'w':
 765                         /* ignore - backward compatibility */
 766                         break;
 767                 case 'h':
 768                         usage(0);
 769                         break;
 770                 default:
 771                         errtryh(EXIT_FAILURE);
 772                 }
 773         }
 774
 775
 776         /* The rest of the args are device names */
 777         if (optind < argc) {
 778                 devices = xcalloc(argc - optind, sizeof(char *));
 779                 while (optind < argc)
 780                         devices[numdev++] = argv[optind++];
 781         }
 782
 783         if (version) {
 784                 print_version(stdout);
 785                 goto exit;
 786         }
 787
 788         /* convert LABEL/UUID lookup to evaluate request */
 789         if (lookup && output_format == OUTPUT_DEVICE_ONLY && search_type &&
 790             (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
 791                 eval++;
 792                 lookup = 0;
 793         }
 794
 795         if (!lowprobe && !eval && blkid_get_cache(&cache, read) < 0)
 796                 goto exit;
 797
 798         if (gc) {
 799                 blkid_gc_cache(cache);
 800                 err = 0;
 801                 goto exit;
 802         }
 803         err = BLKID_EXIT_NOTFOUND;
 804
 805         if (eval == 0 && (output_format & OUTPUT_PRETTY_LIST)) {
 806                 if (lowprobe) {
 807                         fprintf(stderr, "The low-level probing mode does not "
 808                                         "support 'list' output format\n");
 809                         exit(BLKID_EXIT_OTHER);
 810                 }
 811                 pretty_print_dev(NULL);
 812         }
 813
 814         if (lowprobe) {
 815                 /*
 816                  * Low-level API
 817                  */
 818                 blkid_probe pr;
 819
 820                 if (!numdev) {
 821                         fprintf(stderr, "The low-level probing mode "
 822                                         "requires a device\n");
 823                         exit(BLKID_EXIT_OTHER);
 824                 }
 825
 826                 /* automatically enable 'export' format for I/O Limits */
 827                 if (!output_format  && (lowprobe & LOWPROBE_TOPOLOGY))
 828                         output_format = OUTPUT_EXPORT_LIST;
 829
 830                 pr = blkid_new_probe();
 831                 if (!pr)
 832                         goto exit;
 833
 834                 if (lowprobe & LOWPROBE_SUPERBLOCKS) {
 835                         blkid_probe_set_superblocks_flags(pr,
 836                                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 837                                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 838                                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 839
 840                         if (fltr_usage && blkid_probe_filter_superblocks_usage(
 841                                                 pr, fltr_flag, fltr_usage))
 842                                 goto exit;
 843
 844                         else if (fltr_type && blkid_probe_filter_superblocks_type(
 845                                                 pr, fltr_flag, fltr_type))
 846                                 goto exit;
 847                 }
 848
 849                 for (i = 0; i < numdev; i++) {
 850                         err = lowprobe_device(pr, devices[i], lowprobe, show,
 851                                         output_format,
 852                                         (uint64_t) offset,
 853                                         (uint64_t) size);
 854                         if (err)
 855                                 break;
 856                 }
 857                 blkid_free_probe(pr);
 858         } else if (eval) {
 859                 /*
 860                  * Evaluate API
 861                  */
 862                 char *res = blkid_evaluate_tag(search_type, search_value, NULL);
 863                 if (res) {
 864                         err = 0;
 865                         printf("%s\n", res);
 866                 }
 867         } else if (lookup) {
 868                 /*
 869                  * Classic (cache based) API
 870                  */
 871                 blkid_dev dev;
 872
 873                 if (!search_type) {
 874                         fprintf(stderr, "The lookup option requires a "
 875                                 "search type specified using -t\n");
 876                         exit(BLKID_EXIT_OTHER);
 877                 }
 878                 /* Load any additional devices not in the cache */
 879                 for (i = 0; i < numdev; i++)
 880                         blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
 881
 882                 if ((dev = blkid_find_dev_with_tag(cache, search_type,
 883                                                    search_value))) {
 884                         print_tags(dev, show, output_format);
 885                         err = 0;
 886                 }
 887         /* If we didn't specify a single device, show all available devices */
 888         } else if (!numdev) {
 889                 blkid_dev_iterate       iter;
 890                 blkid_dev               dev;
 891
 892                 blkid_probe_all(cache);
 893
 894                 iter = blkid_dev_iterate_begin(cache);
 895                 blkid_dev_set_search(iter, search_type, search_value);
 896                 while (blkid_dev_next(iter, &dev) == 0) {
 897                         dev = blkid_verify(cache, dev);
 898                         if (!dev)
 899                                 continue;
 900                         print_tags(dev, show, output_format);
 901                         err = 0;
 902                 }
 903                 blkid_dev_iterate_end(iter);
 904         /* Add all specified devices to cache (optionally display tags) */
 905         } else for (i = 0; i < numdev; i++) {
 906                 blkid_dev dev = blkid_get_dev(cache, devices[i],
 907                                                   BLKID_DEV_NORMAL);
 908
 909                 if (dev) {
 910                         if (search_type &&
 911                             !blkid_dev_has_tag(dev, search_type,
 912                                                search_value))
 913                                 continue;
 914                         print_tags(dev, show, output_format);
 915                         err = 0;
 916                 }
 917         }
 918
 919 exit:
 920         free(search_type);
 921         free(search_value);
 922         free_types_list(fltr_type);
 923         if (!lowprobe && !eval)
 924                 blkid_put_cache(cache);
 925         free(devices);
 926         return err;
 927 }