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