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 #ifdef HAVE_GETOPT_H
  21 #include <getopt.h>
  22 #else
  23 extern int getopt(int argc, char * const argv[], const char *optstring);
  24 extern char *optarg;
  25 extern int optind;
  26 #endif
  27
  28 #define OUTPUT_VALUE_ONLY       (1 << 1)
  29 #define OUTPUT_DEVICE_ONLY      (1 << 2)
  30 #define OUTPUT_PRETTY_LIST      (1 << 3)                /* deprecated */
  31 #define OUTPUT_UDEV_LIST        (1 << 4)                /* deprecated */
  32 #define OUTPUT_EXPORT_LIST      (1 << 5)
  33
  34 #define LOWPROBE_TOPOLOGY       (1 << 1)
  35 #define LOWPROBE_SUPERBLOCKS    (1 << 2)
  36
  37 #define BLKID_EXIT_NOTFOUND     2       /* token or device not found */
  38 #define BLKID_EXIT_OTHER        4       /* bad usage or other error */
  39 #define BLKID_EXIT_AMBIVAL      8       /* ambivalent low-level probing detected */
  40
  41 #include <blkid.h>
  42
  43 #include "ismounted.h"
  44
  45 #define STRTOXX_EXIT_CODE       BLKID_EXIT_OTHER        /* strtoxx_or_err() */
  46 #include "strutils.h"
  47 #include "closestream.h"
  48 #include "ttyutils.h"
  49
  50 const char *progname = "blkid";
  51
  52 int raw_chars;
  53
  54 static void print_version(FILE *out)
  55 {
  56         fprintf(out, "%s from %s (libblkid %s, %s)\n",
  57                 progname, PACKAGE_STRING, LIBBLKID_VERSION, LIBBLKID_DATE);
  58 }
  59
  60 static void usage(int error)
  61 {
  62         FILE *out = error ? stderr : stdout;
  63
  64         print_version(out);
  65         fprintf(out,
  66                 "Usage:\n"
  67                 " %1$s -L <label> | -U <uuid>\n\n"
  68                 " %1$s [-c <file>] [-ghlLv] [-o <format>] [-s <tag>] \n"
  69                 "       [-t <token>] [<dev> ...]\n\n"
  70                 " %1$s -p [-s <tag>] [-O <offset>] [-S <size>] \n"
  71                 "       [-o <format>] <dev> ...\n\n"
  72                 " %1$s -i [-s <tag>] [-o <format>] <dev> ...\n\n"
  73                 "Options:\n"
  74                 " -c <file>   read from <file> instead of reading from the default\n"
  75                 "               cache file (-c /dev/null means no cache)\n"
  76                 " -d          don't encode non-printing characters\n"
  77                 " -h          print this usage message and exit\n"
  78                 " -g          garbage collect the blkid cache\n"
  79                 " -o <format> output format; can be one of:\n"
  80                 "               value, device, export or full; (default: full)\n"
  81                 " -k          list all known filesystems/RAIDs and exit\n"
  82                 " -s <tag>    show specified tag(s) (default show all tags)\n"
  83                 " -t <token>  find device with a specific token (NAME=value pair)\n"
  84                 " -l          look up only first device with token specified by -t\n"
  85                 " -L <label>  convert LABEL to device name\n"
  86                 " -U <uuid>   convert UUID to device name\n"
  87                 " -v          print version and exit\n"
  88                 " <dev>       specify device(s) to probe (default: all devices)\n\n"
  89                 "Low-level probing options:\n"
  90                 " -p          low-level superblocks probing (bypass cache)\n"
  91                 " -i          gather information about I/O limits\n"
  92                 " -S <size>   overwrite device size\n"
  93                 " -O <offset> probe at the given offset\n"
  94                 " -u <list>   filter by \"usage\" (e.g. -u filesystem,raid)\n"
  95                 " -n <list>   filter by filesystem type (e.g. -n vfat,ext3)\n"
  96                 "\n", progname);
  97
  98         exit(error);
  99 }
 100
 101 /*
 102  * This function does "safe" printing.  It will convert non-printable
 103  * ASCII characters using '^' and M- notation.
 104  */
 105 static void safe_print(const char *cp, int len)
 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                 }
 124                 fputc(ch, stdout);
 125         }
 126 }
 127
 128 static int pretty_print_word(const char *str, int max_len,
 129                              int left_len, int overflow_nl)
 130 {
 131         int len = strlen(str) + left_len;
 132         int ret = 0;
 133
 134         fputs(str, stdout);
 135         if (overflow_nl && len > max_len) {
 136                 fputc('\n', stdout);
 137                 len = 0;
 138         } else if (len > max_len)
 139                 ret = len - max_len;
 140         do
 141                 fputc(' ', stdout);
 142         while (len++ < max_len);
 143         return ret;
 144 }
 145
 146 static void pretty_print_line(const char *device, const char *fs_type,
 147                               const char *label, const char *mtpt,
 148                               const char *uuid)
 149 {
 150         static int device_len = 10, fs_type_len = 7;
 151         static int label_len = 8, mtpt_len = 14;
 152         static int term_width = -1;
 153         int len, w;
 154
 155         if (term_width < 0) {
 156                 term_width = get_terminal_width();
 157                 if (term_width <= 0)
 158                         term_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()-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, "PTTYPE")) {
 254                 printf("ID_PART_TABLE_TYPE=%s\n", value);
 255
 256         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
 257                   !strcmp(name, "PART_ENTRY_TYPE")) {
 258
 259                 blkid_encode_string(value, enc, sizeof(enc));
 260                 printf("ID_%s=%s\n", name, enc);
 261
 262         } else if (!strncmp(name, "PART_ENTRY_", 11))
 263                 printf("ID_%s=%s\n", name, value);
 264
 265         else if (namelen >= 15 && (
 266                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
 267                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
 268                    !strcmp(name, "ALIGNMENT_OFFSET")))
 269                         printf("ID_IOLIMIT_%s=%s\n", name, value);
 270         else
 271                 printf("ID_FS_%s=%s\n", name, value);
 272 }
 273
 274 static int has_item(char *ary[], const char *item)
 275 {
 276         char **p;
 277
 278         for (p = ary; *p != NULL; p++)
 279                 if (!strcmp(item, *p))
 280                         return 1;
 281         return 0;
 282 }
 283
 284 static void print_value(int output, int num, const char *devname,
 285                         const char *value, const char *name, size_t valsz)
 286 {
 287         if (output & OUTPUT_VALUE_ONLY) {
 288                 fputs(value, stdout);
 289                 fputc('\n', stdout);
 290
 291         } else if (output & OUTPUT_UDEV_LIST) {
 292                 print_udev_format(name, value);
 293
 294         } else if (output & OUTPUT_EXPORT_LIST) {
 295                 if (num == 1 && devname)
 296                         printf("DEVNAME=%s\n", devname);
 297                 fputs(name, stdout);
 298                 fputs("=", stdout);
 299                 safe_print(value, valsz);
 300                 fputs("\n", stdout);
 301
 302         } else {
 303                 if (num == 1 && devname)
 304                         printf("%s: ", devname);
 305                 fputs(name, stdout);
 306                 fputs("=\"", stdout);
 307                 safe_print(value, valsz);
 308                 fputs("\" ", stdout);
 309         }
 310 }
 311
 312 static void print_tags(blkid_dev dev, char *show[], int output)
 313 {
 314         blkid_tag_iterate       iter;
 315         const char              *type, *value, *devname;
 316         int                     num = 1;
 317         static int              first = 1;
 318
 319         if (!dev)
 320                 return;
 321
 322         if (output & OUTPUT_PRETTY_LIST) {
 323                 pretty_print_dev(dev);
 324                 return;
 325         }
 326
 327         devname = blkid_dev_devname(dev);
 328
 329         if (output & OUTPUT_DEVICE_ONLY) {
 330                 printf("%s\n", devname);
 331                 return;
 332         }
 333
 334         iter = blkid_tag_iterate_begin(dev);
 335         while (blkid_tag_next(iter, &type, &value) == 0) {
 336                 if (show[0] && !has_item(show, type))
 337                         continue;
 338
 339                 if (num == 1 && !first &&
 340                     (output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 341                         /* add extra line between output from more devices */
 342                         fputc('\n', stdout);
 343
 344                 print_value(output, num++, devname, value, type, strlen(value));
 345         }
 346         blkid_tag_iterate_end(iter);
 347
 348         if (num > 1) {
 349                 if (!(output & (OUTPUT_VALUE_ONLY | OUTPUT_UDEV_LIST |
 350                                                 OUTPUT_EXPORT_LIST)))
 351                         printf("\n");
 352                 first = 0;
 353         }
 354 }
 355
 356
 357 static int append_str(char **res, size_t *sz, const char *a, const char *b)
 358 {
 359         char *str = *res;
 360         size_t asz = a ? strlen(a) : 0;
 361         size_t bsz = b ? strlen(b) : 0;
 362         size_t len = *sz + asz + bsz;
 363
 364         if (!len)
 365                 return -1;
 366
 367         str = realloc(str, len + 1);
 368         if (!str)
 369                 return -1;
 370
 371         *res = str;
 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 = NULL, *type = NULL, *version = NULL;
 398                 char enc[256];
 399
 400                 blkid_probe_lookup_value(pr, "USAGE", &usage, NULL);
 401                 blkid_probe_lookup_value(pr, "TYPE", &type, NULL);
 402                 blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
 403
 404                 if (!usage || !type)
 405                         continue;
 406
 407                 blkid_encode_string(usage, 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_AMBIVALEN=%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 = succes */
 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                         blkid_loff_t offset, blkid_loff_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);
 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 &&
 507             !(chain & LOWPROBE_TOPOLOGY) &&
 508             !(output & OUTPUT_UDEV_LIST) &&
 509             !blkid_probe_has_value(pr, "TYPE") &&
 510             !blkid_probe_has_value(pr, "PTTYPE"))
 511                 /*
 512                  * Ignore probing result if there is not any filesystem or
 513                  * partition table on the device and udev output is not
 514                  * requested.
 515                  *
 516                  * The udev db stores information about partitions, so
 517                  * PART_ENTRY_* values are alway important.
 518                  */
 519                 nvals = 0;
 520
 521         if (nvals && !first && output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST))
 522                 /* add extra line between output from devices */
 523                 fputc('\n', stdout);
 524
 525         if (nvals && (output & OUTPUT_DEVICE_ONLY)) {
 526                 printf("%s\n", devname);
 527                 goto done;
 528         }
 529
 530         for (n = 0; n < nvals; n++) {
 531                 if (blkid_probe_get_value(pr, n, &name, &data, &len))
 532                         continue;
 533                 if (show[0] && !has_item(show, name))
 534                         continue;
 535                 len = strnlen((char *) data, len);
 536                 print_value(output, num++, devname, (char *) data, name, len);
 537         }
 538
 539         if (first)
 540                 first = 0;
 541         if (nvals >= 1 && !(output & (OUTPUT_VALUE_ONLY |
 542                                         OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 543                 printf("\n");
 544 done:
 545         if (rc == -2) {
 546                 if (output & OUTPUT_UDEV_LIST)
 547                         print_udev_ambivalent(pr);
 548                 else
 549                         fprintf(stderr,
 550                                 "%s: ambivalent result (probably more "
 551                                 "filesystems on the device, use wipefs(8) "
 552                                 "to see more details)\n",
 553                                 devname);
 554         }
 555         close(fd);
 556
 557         if (rc == -2)
 558                 return BLKID_EXIT_AMBIVAL;      /* ambivalent probing result */
 559         if (!nvals)
 560                 return BLKID_EXIT_NOTFOUND;     /* nothing detected */
 561
 562         return 0;               /* success */
 563 }
 564
 565 /* converts comma separated list to BLKID_USAGE_* mask */
 566 static int list_to_usage(const char *list, int *flag)
 567 {
 568         int mask = 0;
 569         const char *word = NULL, *p = list;
 570
 571         if (p && strncmp(p, "no", 2) == 0) {
 572                 *flag = BLKID_FLTR_NOTIN;
 573                 p += 2;
 574         }
 575         if (!p || !*p)
 576                 goto err;
 577         while(p) {
 578                 word = p;
 579                 p = strchr(p, ',');
 580                 if (p)
 581                         p++;
 582                 if (!strncmp(word, "filesystem", 10))
 583                         mask |= BLKID_USAGE_FILESYSTEM;
 584                 else if (!strncmp(word, "raid", 4))
 585                         mask |= BLKID_USAGE_RAID;
 586                 else if (!strncmp(word, "crypto", 6))
 587                         mask |= BLKID_USAGE_CRYPTO;
 588                 else if (!strncmp(word, "other", 5))
 589                         mask |= BLKID_USAGE_OTHER;
 590                 else
 591                         goto err;
 592         }
 593         return mask;
 594 err:
 595         *flag = 0;
 596         fprintf(stderr, "unknown kerword in -u <list> argument: '%s'\n",
 597                         word ? word : list);
 598         exit(BLKID_EXIT_OTHER);
 599 }
 600
 601 /* converts comma separated list to types[] */
 602 static char **list_to_types(const char *list, int *flag)
 603 {
 604         int i;
 605         const char *p = list;
 606         char **res = NULL;
 607
 608         if (p && strncmp(p, "no", 2) == 0) {
 609                 *flag = BLKID_FLTR_NOTIN;
 610                 p += 2;
 611         }
 612         if (!p || !*p) {
 613                 fprintf(stderr, "error: -u <list> argument is empty\n");
 614                 goto err;
 615         }
 616         for (i = 1; p && (p = strchr(p, ',')); i++, p++);
 617
 618         res = calloc(i + 1, sizeof(char *));
 619         if (!res)
 620                 goto err_mem;
 621         p = *flag & BLKID_FLTR_NOTIN ? list + 2 : list;
 622         i = 0;
 623
 624         while(p) {
 625                 const char *word = p;
 626                 p = strchr(p, ',');
 627                 res[i] = p ? strndup(word, p - word) : strdup(word);
 628                 if (!res[i++])
 629                         goto err_mem;
 630                 if (p)
 631                         p++;
 632         }
 633         res[i] = NULL;
 634         return res;
 635 err_mem:
 636         fprintf(stderr, "out of memory\n");
 637 err:
 638         *flag = 0;
 639         free(res);
 640         exit(BLKID_EXIT_OTHER);
 641 }
 642
 643 static void free_types_list(char *list[])
 644 {
 645         char **n;
 646
 647         if (!list)
 648                 return;
 649         for (n = list; *n; n++)
 650                 free(*n);
 651         free(list);
 652 }
 653
 654 int main(int argc, char **argv)
 655 {
 656         blkid_cache cache = NULL;
 657         char **devices = NULL;
 658         char *show[128] = { NULL, };
 659         char *search_type = NULL, *search_value = NULL;
 660         char *read = NULL;
 661         int fltr_usage = 0;
 662         char **fltr_type = NULL;
 663         int fltr_flag = BLKID_FLTR_ONLYIN;
 664         unsigned int numdev = 0, numtag = 0;
 665         int version = 0;
 666         int err = BLKID_EXIT_OTHER;
 667         unsigned int i;
 668         int output_format = 0;
 669         int lookup = 0, gc = 0, lowprobe = 0, eval = 0;
 670         int c;
 671         uintmax_t offset = 0, size = 0;
 672
 673         show[0] = NULL;
 674         atexit(close_stdout);
 675
 676         while ((c = getopt (argc, argv, "c:df:ghilL:n:ko:O:ps:S:t:u:U:w:v")) != EOF)
 677                 switch (c) {
 678                 case 'c':
 679                         if (optarg && !*optarg)
 680                                 read = NULL;
 681                         else
 682                                 read = optarg;
 683                         break;
 684                 case 'd':
 685                         raw_chars = 1;
 686                         break;
 687                 case 'L':
 688                         eval++;
 689                         search_value = strdup(optarg);
 690                         search_type = strdup("LABEL");
 691                         break;
 692                 case 'n':
 693                         if (fltr_usage) {
 694                                 fprintf(stderr, "error: -u and -n options are mutually exclusive\n");
 695                                 exit(BLKID_EXIT_OTHER);
 696                         }
 697                         fltr_type = list_to_types(optarg, &fltr_flag);
 698                         break;
 699                 case 'u':
 700                         if (fltr_type) {
 701                                 fprintf(stderr, "error: -u and -n options are mutually exclusive\n");
 702                                 exit(BLKID_EXIT_OTHER);
 703                         }
 704                         fltr_usage = list_to_usage(optarg, &fltr_flag);
 705                         break;
 706                 case 'U':
 707                         eval++;
 708                         search_value = strdup(optarg);
 709                         search_type = strdup("UUID");
 710                         break;
 711                 case 'i':
 712                         lowprobe |= LOWPROBE_TOPOLOGY;
 713                         break;
 714                 case 'l':
 715                         lookup++;
 716                         break;
 717                 case 'g':
 718                         gc = 1;
 719                         break;
 720                 case 'k':
 721                 {
 722                         size_t idx = 0;
 723                         const char *name = NULL;
 724
 725                         while (blkid_superblocks_get_name(idx++, &name, NULL) == 0)
 726                                 printf("%s\n", name);
 727                         exit(EXIT_SUCCESS);
 728                 }
 729                 case 'o':
 730                         if (!strcmp(optarg, "value"))
 731                                 output_format = OUTPUT_VALUE_ONLY;
 732                         else if (!strcmp(optarg, "device"))
 733                                 output_format = OUTPUT_DEVICE_ONLY;
 734                         else if (!strcmp(optarg, "list"))
 735                                 output_format = OUTPUT_PRETTY_LIST;     /* deprecated */
 736                         else if (!strcmp(optarg, "udev"))
 737                                 output_format = OUTPUT_UDEV_LIST;
 738                         else if (!strcmp(optarg, "export"))
 739                                 output_format = OUTPUT_EXPORT_LIST;
 740                         else if (!strcmp(optarg, "full"))
 741                                 output_format = 0;
 742                         else {
 743                                 fprintf(stderr, "Invalid output format %s. "
 744                                         "Choose from value,\n\t"
 745                                         "device, list, udev or full\n", optarg);
 746                                 exit(BLKID_EXIT_OTHER);
 747                         }
 748                         break;
 749                 case 'O':
 750                         offset = strtosize_or_err(optarg, "invalid offset argument");
 751                         break;
 752                 case 'p':
 753                         lowprobe |= LOWPROBE_SUPERBLOCKS;
 754                         break;
 755                 case 's':
 756                         if (numtag + 1 >= sizeof(show) / sizeof(*show)) {
 757                                 fprintf(stderr, "Too many tags specified\n");
 758                                 usage(err);
 759                         }
 760                         show[numtag++] = optarg;
 761                         show[numtag] = NULL;
 762                         break;
 763                 case 'S':
 764                         size = strtosize_or_err(optarg, "invalid size argument");
 765                         break;
 766                 case 't':
 767                         if (search_type) {
 768                                 fprintf(stderr, "Can only search for "
 769                                                 "one NAME=value pair\n");
 770                                 usage(err);
 771                         }
 772                         if (blkid_parse_tag_string(optarg,
 773                                                    &search_type,
 774                                                    &search_value)) {
 775                                 fprintf(stderr, "-t needs NAME=value pair\n");
 776                                 usage(err);
 777                         }
 778                         break;
 779                 case 'v':
 780                         version = 1;
 781                         break;
 782                 case 'w':
 783                         /* ignore - backward compatibility */
 784                         break;
 785                 case 'h':
 786                         err = 0;
 787                         /* fallthrough */
 788                 default:
 789                         usage(err);
 790                 }
 791
 792
 793         /* The rest of the args are device names */
 794         if (optind < argc) {
 795                 devices = calloc(argc - optind, sizeof(char *));
 796                 if (!devices) {
 797                         fprintf(stderr, "Failed to allocate device name array\n");
 798                         goto exit;
 799                 }
 800
 801                 while (optind < argc)
 802                         devices[numdev++] = argv[optind++];
 803         }
 804
 805         if (version) {
 806                 print_version(stdout);
 807                 goto exit;
 808         }
 809
 810         /* convert LABEL/UUID lookup to evaluate request */
 811         if (lookup && output_format == OUTPUT_DEVICE_ONLY && search_type &&
 812             (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
 813                 eval++;
 814                 lookup = 0;
 815         }
 816
 817         if (!lowprobe && !eval && blkid_get_cache(&cache, read) < 0)
 818                 goto exit;
 819
 820         if (gc) {
 821                 blkid_gc_cache(cache);
 822                 err = 0;
 823                 goto exit;
 824         }
 825         err = BLKID_EXIT_NOTFOUND;
 826
 827         if (eval == 0 && (output_format & OUTPUT_PRETTY_LIST)) {
 828                 if (lowprobe) {
 829                         fprintf(stderr, "The low-level probing mode does not "
 830                                         "support 'list' output format\n");
 831                         exit(BLKID_EXIT_OTHER);
 832                 }
 833                 pretty_print_dev(NULL);
 834         }
 835
 836         if (lowprobe) {
 837                 /*
 838                  * Low-level API
 839                  */
 840                 blkid_probe pr;
 841
 842                 if (!numdev) {
 843                         fprintf(stderr, "The low-level probing mode "
 844                                         "requires a device\n");
 845                         exit(BLKID_EXIT_OTHER);
 846                 }
 847
 848                 /* automatically enable 'export' format for I/O Limits */
 849                 if (!output_format  && (lowprobe & LOWPROBE_TOPOLOGY))
 850                         output_format = OUTPUT_EXPORT_LIST;
 851
 852                 pr = blkid_new_probe();
 853                 if (!pr)
 854                         goto exit;
 855
 856                 if (lowprobe & LOWPROBE_SUPERBLOCKS) {
 857                         blkid_probe_set_superblocks_flags(pr,
 858                                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 859                                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 860                                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 861
 862                         if (fltr_usage && blkid_probe_filter_superblocks_usage(
 863                                                 pr, fltr_flag, fltr_usage))
 864                                 goto exit;
 865
 866                         else if (fltr_type && blkid_probe_filter_superblocks_type(
 867                                                 pr, fltr_flag, fltr_type))
 868                                 goto exit;
 869                 }
 870
 871                 for (i = 0; i < numdev; i++) {
 872                         err = lowprobe_device(pr, devices[i], lowprobe, show,
 873                                         output_format,
 874                                         (blkid_loff_t) offset,
 875                                         (blkid_loff_t) size);
 876                         if (err)
 877                                 break;
 878                 }
 879                 blkid_free_probe(pr);
 880         } else if (eval) {
 881                 /*
 882                  * Evaluate API
 883                  */
 884                 char *res = blkid_evaluate_tag(search_type, search_value, NULL);
 885                 if (res) {
 886                         err = 0;
 887                         printf("%s\n", res);
 888                 }
 889         } else if (lookup) {
 890                 /*
 891                  * Classic (cache based) API
 892                  */
 893                 blkid_dev dev;
 894
 895                 if (!search_type) {
 896                         fprintf(stderr, "The lookup option requires a "
 897                                 "search type specified using -t\n");
 898                         exit(BLKID_EXIT_OTHER);
 899                 }
 900                 /* Load any additional devices not in the cache */
 901                 for (i = 0; i < numdev; i++)
 902                         blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
 903
 904                 if ((dev = blkid_find_dev_with_tag(cache, search_type,
 905                                                    search_value))) {
 906                         print_tags(dev, show, output_format);
 907                         err = 0;
 908                 }
 909         /* If we didn't specify a single device, show all available devices */
 910         } else if (!numdev) {
 911                 blkid_dev_iterate       iter;
 912                 blkid_dev               dev;
 913
 914                 blkid_probe_all(cache);
 915
 916                 iter = blkid_dev_iterate_begin(cache);
 917                 blkid_dev_set_search(iter, search_type, search_value);
 918                 while (blkid_dev_next(iter, &dev) == 0) {
 919                         dev = blkid_verify(cache, dev);
 920                         if (!dev)
 921                                 continue;
 922                         print_tags(dev, show, output_format);
 923                         err = 0;
 924                 }
 925                 blkid_dev_iterate_end(iter);
 926         /* Add all specified devices to cache (optionally display tags) */
 927         } else for (i = 0; i < numdev; i++) {
 928                 blkid_dev dev = blkid_get_dev(cache, devices[i],
 929                                                   BLKID_DEV_NORMAL);
 930
 931                 if (dev) {
 932                         if (search_type &&
 933                             !blkid_dev_has_tag(dev, search_type,
 934                                                search_value))
 935                                 continue;
 936                         print_tags(dev, show, output_format);
 937                         err = 0;
 938                 }
 939         }
 940
 941 exit:
 942         free(search_type);
 943         free(search_value);
 944         free_types_list(fltr_type);
 945         if (!lowprobe && !eval)
 946                 blkid_put_cache(cache);
 947         free(devices);
 948         return err;
 949 }