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