misc-utils/blkid.c

   1 /*
   2  * blkid.c - User command-line interface for libblkid
   3  *
   4  * Copyright (C) 2001 Andreas Dilger
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the
   8  * GNU Lesser General Public License.
   9  * %End-Header%
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <string.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <fcntl.h>
  19 #include <errno.h>
  20 #include <getopt.h>
  21
  22 #define OUTPUT_VALUE_ONLY       (1 << 1)
  23 #define OUTPUT_DEVICE_ONLY      (1 << 2)
  24 #define OUTPUT_PRETTY_LIST      (1 << 3)                /* deprecated */
  25 #define OUTPUT_UDEV_LIST        (1 << 4)                /* deprecated */
  26 #define OUTPUT_EXPORT_LIST      (1 << 5)
  27
  28 #define LOWPROBE_TOPOLOGY       (1 << 1)
  29 #define LOWPROBE_SUPERBLOCKS    (1 << 2)
  30
  31 #define BLKID_EXIT_NOTFOUND     2       /* token or device not found */
  32 #define BLKID_EXIT_OTHER        4       /* bad usage or other error */
  33 #define BLKID_EXIT_AMBIVAL      8       /* ambivalent low-level probing detected */
  34
  35 #include <blkid.h>
  36
  37 #include "ismounted.h"
  38
  39 #define STRTOXX_EXIT_CODE       BLKID_EXIT_OTHER        /* strtoxx_or_err() */
  40 #include "strutils.h"
  41 #define OPTUTILS_EXIT_CODE      BLKID_EXIT_OTHER        /* exclusive_option() */
  42 #include "optutils.h"
  43
  44 #include "closestream.h"
  45 #include "ttyutils.h"
  46 #include "xalloc.h"
  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                 program_invocation_short_name, PACKAGE_STRING,
  54                 LIBBLKID_VERSION, LIBBLKID_DATE);
  55 }
  56
  57 static void usage(int error)
  58 {
  59         FILE *out = error ? stderr : stdout;
  60
  61         print_version(out);
  62         fprintf(out,
  63                 "Usage:\n"
  64                 " %1$s -L <label> | -U <uuid>\n\n"
  65                 " %1$s [-c <file>] [-ghlLv] [-o <format>] [-s <tag>] \n"
  66                 "       [-t <token>] [<dev> ...]\n\n"
  67                 " %1$s -p [-s <tag>] [-O <offset>] [-S <size>] \n"
  68                 "       [-o <format>] <dev> ...\n\n"
  69                 " %1$s -i [-s <tag>] [-o <format>] <dev> ...\n\n"
  70                 "Options:\n"
  71                 " -c <file>   read from <file> instead of reading from the default\n"
  72                 "               cache file (-c /dev/null means no cache)\n"
  73                 " -d          don't encode non-printing characters\n"
  74                 " -h          print this usage message and exit\n"
  75                 " -g          garbage collect the blkid cache\n"
  76                 " -o <format> output format; can be one of:\n"
  77                 "               value, device, export or full; (default: full)\n"
  78                 " -k          list all known filesystems/RAIDs and exit\n"
  79                 " -s <tag>    show specified tag(s) (default show all tags)\n"
  80                 " -t <token>  find device with a specific token (NAME=value pair)\n"
  81                 " -l          look up only first device with token specified by -t\n"
  82                 " -L <label>  convert LABEL to device name\n"
  83                 " -U <uuid>   convert UUID to device name\n"
  84                 " -V          print version and exit\n"
  85                 " <dev>       specify device(s) to probe (default: all devices)\n\n"
  86                 "Low-level probing options:\n"
  87                 " -p          low-level superblocks probing (bypass cache)\n"
  88                 " -i          gather information about I/O limits\n"
  89                 " -S <size>   overwrite device size\n"
  90                 " -O <offset> probe at the given offset\n"
  91                 " -u <list>   filter by \"usage\" (e.g. -u filesystem,raid)\n"
  92                 " -n <list>   filter by filesystem type (e.g. -n vfat,ext3)\n"
  93                 "\n", program_invocation_short_name);
  94
  95         exit(error);
  96 }
  97
  98 /*
  99  * This function does "safe" printing.  It will convert non-printable
 100  * ASCII characters using '^' and M- notation.
 101  *
 102  * If 'esc' is defined then escape all chars from esc by \.
 103  */
 104 static void safe_print(const char *cp, int len, const char *esc)
 105 {
 106         unsigned char   ch;
 107
 108         if (len < 0)
 109                 len = strlen(cp);
 110
 111         while (len--) {
 112                 ch = *cp++;
 113                 if (!raw_chars) {
 114                         if (ch >= 128) {
 115                                 fputs("M-", stdout);
 116                                 ch -= 128;
 117                         }
 118                         if ((ch < 32) || (ch == 0x7f)) {
 119                                 fputc('^', stdout);
 120                                 ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
 121
 122                         } else if (esc && strchr(esc, ch))
 123                                 fputc('\\', stdout);
 124                 }
 125                 fputc(ch, stdout);
 126         }
 127 }
 128
 129 static int pretty_print_word(const char *str, int max_len,
 130                              int left_len, int overflow_nl)
 131 {
 132         int len = strlen(str) + left_len;
 133         int ret = 0;
 134
 135         fputs(str, stdout);
 136         if (overflow_nl && len > max_len) {
 137                 fputc('\n', stdout);
 138                 len = 0;
 139         } else if (len > max_len)
 140                 ret = len - max_len;
 141         do
 142                 fputc(' ', stdout);
 143         while (len++ < max_len);
 144         return ret;
 145 }
 146
 147 static void pretty_print_line(const char *device, const char *fs_type,
 148                               const char *label, const char *mtpt,
 149                               const char *uuid)
 150 {
 151         static int device_len = 10, fs_type_len = 7;
 152         static int label_len = 8, mtpt_len = 14;
 153         static int term_width = -1;
 154         int len, w;
 155
 156         if (term_width < 0) {
 157                 term_width = get_terminal_width(80);
 158         }
 159         if (term_width > 80) {
 160                 term_width -= 80;
 161                 w = term_width / 10;
 162                 if (w > 8)
 163                         w = 8;
 164                 term_width -= 2*w;
 165                 label_len += w;
 166                 fs_type_len += w;
 167                 w = term_width/2;
 168                 device_len += w;
 169                 mtpt_len +=w;
 170         }
 171
 172         len = pretty_print_word(device, device_len, 0, 1);
 173         len = pretty_print_word(fs_type, fs_type_len, len, 0);
 174         len = pretty_print_word(label, label_len, len, 0);
 175         pretty_print_word(mtpt, mtpt_len, len, 0);
 176
 177         fputs(uuid, stdout);
 178         fputc('\n', stdout);
 179 }
 180
 181 static void pretty_print_dev(blkid_dev dev)
 182 {
 183         blkid_tag_iterate       iter;
 184         const char              *type, *value, *devname;
 185         const char              *uuid = "", *fs_type = "", *label = "";
 186         int                     len, mount_flags;
 187         char                    mtpt[80];
 188         int                     retval;
 189
 190         if (dev == NULL) {
 191                 pretty_print_line("device", "fs_type", "label",
 192                                   "mount point", "UUID");
 193                 for (len=get_terminal_width(0)-1; len > 0; len--)
 194                         fputc('-', stdout);
 195                 fputc('\n', stdout);
 196                 return;
 197         }
 198
 199         devname = blkid_dev_devname(dev);
 200         if (access(devname, F_OK))
 201                 return;
 202
 203         /* Get the uuid, label, type */
 204         iter = blkid_tag_iterate_begin(dev);
 205         while (blkid_tag_next(iter, &type, &value) == 0) {
 206                 if (!strcmp(type, "UUID"))
 207                         uuid = value;
 208                 if (!strcmp(type, "TYPE"))
 209                         fs_type = value;
 210                 if (!strcmp(type, "LABEL"))
 211                         label = value;
 212         }
 213         blkid_tag_iterate_end(iter);
 214
 215         /* Get the mount point */
 216         mtpt[0] = 0;
 217         retval = check_mount_point(devname, &mount_flags, mtpt, sizeof(mtpt));
 218         if (retval == 0) {
 219                 if (mount_flags & MF_MOUNTED) {
 220                         if (!mtpt[0])
 221                                 strcpy(mtpt, "(mounted, mtpt unknown)");
 222                 } else if (mount_flags & MF_BUSY)
 223                         strcpy(mtpt, "(in use)");
 224                 else
 225                         strcpy(mtpt, "(not mounted)");
 226         }
 227
 228         pretty_print_line(devname, fs_type, label, mtpt, uuid);
 229 }
 230
 231 static void print_udev_format(const char *name, const char *value)
 232 {
 233         char enc[265], safe[256];
 234         size_t namelen = strlen(name);
 235
 236         *safe = *enc = '\0';
 237
 238         if (!strcmp(name, "TYPE") || !strcmp(name, "VERSION")) {
 239                 blkid_encode_string(value, enc, sizeof(enc));
 240                 printf("ID_FS_%s=%s\n", name, enc);
 241
 242         } else if (!strcmp(name, "UUID") ||
 243                  !strcmp(name, "LABEL") ||
 244                  !strcmp(name, "UUID_SUB")) {
 245
 246                 blkid_safe_string(value, safe, sizeof(safe));
 247                 printf("ID_FS_%s=%s\n", name, safe);
 248
 249                 blkid_encode_string(value, enc, sizeof(enc));
 250                 printf("ID_FS_%s_ENC=%s\n", name, enc);
 251
 252         } else if (!strcmp(name, "PTUUID")) {
 253                 printf("ID_PART_TABLE_UUID=%s\n", value);
 254
 255         } else if (!strcmp(name, "PTTYPE")) {
 256                 printf("ID_PART_TABLE_TYPE=%s\n", value);
 257
 258         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
 259                   !strcmp(name, "PART_ENTRY_TYPE")) {
 260
 261                 blkid_encode_string(value, enc, sizeof(enc));
 262                 printf("ID_%s=%s\n", name, enc);
 263
 264         } else if (!strncmp(name, "PART_ENTRY_", 11))
 265                 printf("ID_%s=%s\n", name, value);
 266
 267         else if (namelen >= 15 && (
 268                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
 269                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
 270                    !strcmp(name, "ALIGNMENT_OFFSET")))
 271                         printf("ID_IOLIMIT_%s=%s\n", name, value);
 272         else
 273                 printf("ID_FS_%s=%s\n", name, value);
 274 }
 275
 276 static int has_item(char *ary[], const char *item)
 277 {
 278         char **p;
 279
 280         for (p = ary; *p != NULL; p++)
 281                 if (!strcmp(item, *p))
 282                         return 1;
 283         return 0;
 284 }
 285
 286 static void print_value(int output, int num, const char *devname,
 287                         const char *value, const char *name, size_t valsz)
 288 {
 289         if (output & OUTPUT_VALUE_ONLY) {
 290                 fputs(value, stdout);
 291                 fputc('\n', stdout);
 292
 293         } else if (output & OUTPUT_UDEV_LIST) {
 294                 print_udev_format(name, value);
 295
 296         } else if (output & OUTPUT_EXPORT_LIST) {
 297                 if (num == 1 && devname)
 298                         printf("DEVNAME=%s\n", devname);
 299                 fputs(name, stdout);
 300                 fputs("=", stdout);
 301                 safe_print(value, valsz, " \\\"'$`<>");
 302                 fputs("\n", stdout);
 303
 304         } else {
 305                 if (num == 1 && devname)
 306                         printf("%s:", devname);
 307                 fputs(" ", stdout);
 308                 fputs(name, stdout);
 309                 fputs("=\"", stdout);
 310                 safe_print(value, valsz, "\"\\");
 311                 fputs("\"", stdout);
 312         }
 313 }
 314
 315 static void print_tags(blkid_dev dev, char *show[], int output)
 316 {
 317         blkid_tag_iterate       iter;
 318         const char              *type, *value, *devname;
 319         int                     num = 1;
 320         static int              first = 1;
 321
 322         if (!dev)
 323                 return;
 324
 325         if (output & OUTPUT_PRETTY_LIST) {
 326                 pretty_print_dev(dev);
 327                 return;
 328         }
 329
 330         devname = blkid_dev_devname(dev);
 331
 332         if (output & OUTPUT_DEVICE_ONLY) {
 333                 printf("%s\n", devname);
 334                 return;
 335         }
 336
 337         iter = blkid_tag_iterate_begin(dev);
 338         while (blkid_tag_next(iter, &type, &value) == 0) {
 339                 if (show[0] && !has_item(show, type))
 340                         continue;
 341
 342                 if (num == 1 && !first &&
 343                     (output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 344                         /* add extra line between output from more devices */
 345                         fputc('\n', stdout);
 346
 347                 print_value(output, num++, devname, value, type, strlen(value));
 348         }
 349         blkid_tag_iterate_end(iter);
 350
 351         if (num > 1) {
 352                 if (!(output & (OUTPUT_VALUE_ONLY | OUTPUT_UDEV_LIST |
 353                                                 OUTPUT_EXPORT_LIST)))
 354                         printf("\n");
 355                 first = 0;
 356         }
 357 }
 358
 359
 360 static int append_str(char **res, size_t *sz, const char *a, const char *b)
 361 {
 362         char *str = *res;
 363         size_t asz = a ? strlen(a) : 0;
 364         size_t bsz = b ? strlen(b) : 0;
 365         size_t len = *sz + asz + bsz;
 366
 367         if (!len)
 368                 return -1;
 369
 370         *res = str = xrealloc(str, len + 1);
 371         str += *sz;
 372
 373         if (a) {
 374                 memcpy(str, a, asz);
 375                 str += asz;
 376         }
 377         if (b) {
 378                 memcpy(str, b, bsz);
 379                 str += bsz;
 380         }
 381         *str = '\0';
 382         *sz = len;
 383         return 0;
 384 }
 385
 386 /*
 387  * Compose and print ID_FS_AMBIVALENT for udev
 388  */
 389 static int print_udev_ambivalent(blkid_probe pr)
 390 {
 391         char *val = NULL;
 392         size_t valsz = 0;
 393         int count = 0, rc = -1;
 394
 395         while (!blkid_do_probe(pr)) {
 396                 const char *usage_txt = NULL, *type = NULL, *version = NULL;
 397                 char enc[256];
 398
 399                 blkid_probe_lookup_value(pr, "USAGE", &usage_txt, NULL);
 400                 blkid_probe_lookup_value(pr, "TYPE", &type, NULL);
 401                 blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
 402
 403                 if (!usage_txt || !type)
 404                         continue;
 405
 406                 blkid_encode_string(usage_txt, enc, sizeof(enc));
 407                 if (append_str(&val, &valsz, enc, ":"))
 408                         goto done;
 409
 410                 blkid_encode_string(type, enc, sizeof(enc));
 411                 if (append_str(&val, &valsz, enc, version ? ":" : " "))
 412                         goto done;
 413
 414                 if (version) {
 415                         blkid_encode_string(version, enc, sizeof(enc));
 416                         if (append_str(&val, &valsz, enc, " "))
 417                                 goto done;
 418                 }
 419                 count++;
 420         }
 421
 422         if (count > 1) {
 423                 *(val + valsz - 1) = '\0';              /* rem tailing whitespace */
 424                 printf("ID_FS_AMBIVALENT=%s\n", val);
 425                 rc = 0;
 426         }
 427 done:
 428         free(val);
 429         return rc;
 430 }
 431
 432 static int lowprobe_superblocks(blkid_probe pr)
 433 {
 434         struct stat st;
 435         int rc, fd = blkid_probe_get_fd(pr);
 436
 437         if (fd < 0 || fstat(fd, &st))
 438                 return -1;
 439
 440         blkid_probe_enable_partitions(pr, 1);
 441
 442         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
 443             blkid_probe_is_wholedisk(pr)) {
 444                 /*
 445                  * check if the small disk is partitioned, if yes then
 446                  * don't probe for filesystems.
 447                  */
 448                 blkid_probe_enable_superblocks(pr, 0);
 449
 450                 rc = blkid_do_fullprobe(pr);
 451                 if (rc < 0)
 452                         return rc;      /* -1 = error, 1 = nothing, 0 = succes */
 453
 454                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 455                         return 0;       /* partition table detected */
 456         }
 457
 458         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 459         blkid_probe_enable_superblocks(pr, 1);
 460
 461         return blkid_do_safeprobe(pr);
 462 }
 463
 464 static int lowprobe_topology(blkid_probe pr)
 465 {
 466         /* enable topology probing only */
 467         blkid_probe_enable_topology(pr, 1);
 468
 469         blkid_probe_enable_superblocks(pr, 0);
 470         blkid_probe_enable_partitions(pr, 0);
 471
 472         return blkid_do_fullprobe(pr);
 473 }
 474
 475 static int lowprobe_device(blkid_probe pr, const char *devname,
 476                         int chain, char *show[], int output,
 477                         uint64_t offset, uint64_t size)
 478 {
 479         const char *data;
 480         const char *name;
 481         int nvals = 0, n, num = 1;
 482         size_t len;
 483         int fd;
 484         int rc = 0;
 485         static int first = 1;
 486
 487         fd = open(devname, O_RDONLY|O_CLOEXEC);
 488         if (fd < 0) {
 489                 fprintf(stderr, "error: %s: %m\n", devname);
 490                 return BLKID_EXIT_NOTFOUND;
 491         }
 492         if (blkid_probe_set_device(pr, fd, offset, size))
 493                 goto done;
 494
 495         if (chain & LOWPROBE_TOPOLOGY)
 496                 rc = lowprobe_topology(pr);
 497         if (rc >= 0 && (chain & LOWPROBE_SUPERBLOCKS))
 498                 rc = lowprobe_superblocks(pr);
 499         if (rc < 0)
 500                 goto done;
 501
 502         if (!rc)
 503                 nvals = blkid_probe_numof_values(pr);
 504
 505         if (nvals && !first && output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST))
 506                 /* add extra line between output from devices */
 507                 fputc('\n', stdout);
 508
 509         if (nvals && (output & OUTPUT_DEVICE_ONLY)) {
 510                 printf("%s\n", devname);
 511                 goto done;
 512         }
 513
 514         for (n = 0; n < nvals; n++) {
 515                 if (blkid_probe_get_value(pr, n, &name, &data, &len))
 516                         continue;
 517                 if (show[0] && !has_item(show, name))
 518                         continue;
 519                 len = strnlen((char *) data, len);
 520                 print_value(output, num++, devname, (char *) data, name, len);
 521         }
 522
 523         if (first)
 524                 first = 0;
 525         if (nvals >= 1 && !(output & (OUTPUT_VALUE_ONLY |
 526                                         OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 527                 printf("\n");
 528 done:
 529         if (rc == -2) {
 530                 if (output & OUTPUT_UDEV_LIST)
 531                         print_udev_ambivalent(pr);
 532                 else
 533                         fprintf(stderr,
 534                                 "%s: ambivalent result (probably more "
 535                                 "filesystems on the device, use wipefs(8) "
 536                                 "to see more details)\n",
 537                                 devname);
 538         }
 539         close(fd);
 540
 541         if (rc == -2)
 542                 return BLKID_EXIT_AMBIVAL;      /* ambivalent probing result */
 543         if (!nvals)
 544                 return BLKID_EXIT_NOTFOUND;     /* nothing detected */
 545
 546         return 0;               /* success */
 547 }
 548
 549 /* converts comma separated list to BLKID_USAGE_* mask */
 550 static int list_to_usage(const char *list, int *flag)
 551 {
 552         int mask = 0;
 553         const char *word = NULL, *p = list;
 554
 555         if (p && strncmp(p, "no", 2) == 0) {
 556                 *flag = BLKID_FLTR_NOTIN;
 557                 p += 2;
 558         }
 559         if (!p || !*p)
 560                 goto err;
 561         while(p) {
 562                 word = p;
 563                 p = strchr(p, ',');
 564                 if (p)
 565                         p++;
 566                 if (!strncmp(word, "filesystem", 10))
 567                         mask |= BLKID_USAGE_FILESYSTEM;
 568                 else if (!strncmp(word, "raid", 4))
 569                         mask |= BLKID_USAGE_RAID;
 570                 else if (!strncmp(word, "crypto", 6))
 571                         mask |= BLKID_USAGE_CRYPTO;
 572                 else if (!strncmp(word, "other", 5))
 573                         mask |= BLKID_USAGE_OTHER;
 574                 else
 575                         goto err;
 576         }
 577         return mask;
 578 err:
 579         *flag = 0;
 580         fprintf(stderr, "unknown keyword in -u <list> argument: '%s'\n",
 581                         word ? word : list);
 582         exit(BLKID_EXIT_OTHER);
 583 }
 584
 585 /* converts comma separated list to types[] */
 586 static char **list_to_types(const char *list, int *flag)
 587 {
 588         int i;
 589         const char *p = list;
 590         char **res = NULL;
 591
 592         if (p && strncmp(p, "no", 2) == 0) {
 593                 *flag = BLKID_FLTR_NOTIN;
 594                 p += 2;
 595         }
 596         if (!p || !*p) {
 597                 fprintf(stderr, "error: -u <list> argument is empty\n");
 598                 goto err;
 599         }
 600         for (i = 1; p && (p = strchr(p, ',')); i++, p++);
 601
 602         res = xcalloc(i + 1, sizeof(char *));
 603         p = *flag & BLKID_FLTR_NOTIN ? list + 2 : list;
 604         i = 0;
 605
 606         while(p) {
 607                 const char *word = p;
 608                 p = strchr(p, ',');
 609                 res[i++] = p ? xstrndup(word, p - word) : xstrdup(word);
 610                 if (p)
 611                         p++;
 612         }
 613         res[i] = NULL;
 614         return res;
 615 err:
 616         *flag = 0;
 617         free(res);
 618         exit(BLKID_EXIT_OTHER);
 619 }
 620
 621 static void free_types_list(char *list[])
 622 {
 623         char **n;
 624
 625         if (!list)
 626                 return;
 627         for (n = list; *n; n++)
 628                 free(*n);
 629         free(list);
 630 }
 631
 632 int main(int argc, char **argv)
 633 {
 634         blkid_cache cache = NULL;
 635         char **devices = NULL;
 636         char *show[128] = { NULL, };
 637         char *search_type = NULL, *search_value = NULL;
 638         char *read = NULL;
 639         int fltr_usage = 0;
 640         char **fltr_type = NULL;
 641         int fltr_flag = BLKID_FLTR_ONLYIN;
 642         unsigned int numdev = 0, numtag = 0;
 643         int version = 0;
 644         int err = BLKID_EXIT_OTHER;
 645         unsigned int i;
 646         int output_format = 0;
 647         int lookup = 0, gc = 0, lowprobe = 0, eval = 0;
 648         int c;
 649         uintmax_t offset = 0, size = 0;
 650
 651         static const ul_excl_t excl[] = {       /* rows and cols in in ASCII order */
 652                 { 'n','u' },
 653                 { 0 }
 654         };
 655         int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
 656
 657         show[0] = NULL;
 658         atexit(close_stdout);
 659
 660         while ((c = getopt (argc, argv,
 661                             "c:df:ghilL:n:ko:O:ps:S:t:u:U:w:Vv")) != EOF) {
 662
 663                 err_exclusive_options(c, NULL, excl, excl_st);
 664
 665                 switch (c) {
 666                 case 'c':
 667                         if (optarg && !*optarg)
 668                                 read = NULL;
 669                         else
 670                                 read = optarg;
 671                         break;
 672                 case 'd':
 673                         raw_chars = 1;
 674                         break;
 675                 case 'L':
 676                         eval++;
 677                         search_value = xstrdup(optarg);
 678                         search_type = xstrdup("LABEL");
 679                         break;
 680                 case 'n':
 681                         fltr_type = list_to_types(optarg, &fltr_flag);
 682                         break;
 683                 case 'u':
 684                         fltr_usage = list_to_usage(optarg, &fltr_flag);
 685                         break;
 686                 case 'U':
 687                         eval++;
 688                         search_value = xstrdup(optarg);
 689                         search_type = xstrdup("UUID");
 690                         break;
 691                 case 'i':
 692                         lowprobe |= LOWPROBE_TOPOLOGY;
 693                         break;
 694                 case 'l':
 695                         lookup++;
 696                         break;
 697                 case 'g':
 698                         gc = 1;
 699                         break;
 700                 case 'k':
 701                 {
 702                         size_t idx = 0;
 703                         const char *name = NULL;
 704
 705                         while (blkid_superblocks_get_name(idx++, &name, NULL) == 0)
 706                                 printf("%s\n", name);
 707                         exit(EXIT_SUCCESS);
 708                 }
 709                 case 'o':
 710                         if (!strcmp(optarg, "value"))
 711                                 output_format = OUTPUT_VALUE_ONLY;
 712                         else if (!strcmp(optarg, "device"))
 713                                 output_format = OUTPUT_DEVICE_ONLY;
 714                         else if (!strcmp(optarg, "list"))
 715                                 output_format = OUTPUT_PRETTY_LIST;     /* deprecated */
 716                         else if (!strcmp(optarg, "udev"))
 717                                 output_format = OUTPUT_UDEV_LIST;
 718                         else if (!strcmp(optarg, "export"))
 719                                 output_format = OUTPUT_EXPORT_LIST;
 720                         else if (!strcmp(optarg, "full"))
 721                                 output_format = 0;
 722                         else {
 723                                 fprintf(stderr, "Invalid output format %s. "
 724                                         "Choose from value,\n\t"
 725                                         "device, list, udev or full\n", optarg);
 726                                 exit(BLKID_EXIT_OTHER);
 727                         }
 728                         break;
 729                 case 'O':
 730                         offset = strtosize_or_err(optarg, "invalid offset argument");
 731                         break;
 732                 case 'p':
 733                         lowprobe |= LOWPROBE_SUPERBLOCKS;
 734                         break;
 735                 case 's':
 736                         if (numtag + 1 >= sizeof(show) / sizeof(*show)) {
 737                                 fprintf(stderr, "Too many tags specified\n");
 738                                 usage(err);
 739                         }
 740                         show[numtag++] = optarg;
 741                         show[numtag] = NULL;
 742                         break;
 743                 case 'S':
 744                         size = strtosize_or_err(optarg, "invalid size argument");
 745                         break;
 746                 case 't':
 747                         if (search_type) {
 748                                 fprintf(stderr, "Can only search for "
 749                                                 "one NAME=value pair\n");
 750                                 usage(err);
 751                         }
 752                         if (blkid_parse_tag_string(optarg,
 753                                                    &search_type,
 754                                                    &search_value)) {
 755                                 fprintf(stderr, "-t needs NAME=value pair\n");
 756                                 usage(err);
 757                         }
 758                         break;
 759                 case 'V':
 760                 case 'v':
 761                         version = 1;
 762                         break;
 763                 case 'w':
 764                         /* ignore - backward compatibility */
 765                         break;
 766                 case 'h':
 767                         err = 0;
 768                         /* fallthrough */
 769                 default:
 770                         usage(err);
 771                 }
 772         }
 773
 774
 775         /* The rest of the args are device names */
 776         if (optind < argc) {
 777                 devices = xcalloc(argc - optind, sizeof(char *));
 778                 while (optind < argc)
 779                         devices[numdev++] = argv[optind++];
 780         }
 781
 782         if (version) {
 783                 print_version(stdout);
 784                 goto exit;
 785         }
 786
 787         /* convert LABEL/UUID lookup to evaluate request */
 788         if (lookup && output_format == OUTPUT_DEVICE_ONLY && search_type &&
 789             (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
 790                 eval++;
 791                 lookup = 0;
 792         }
 793
 794         if (!lowprobe && !eval && blkid_get_cache(&cache, read) < 0)
 795                 goto exit;
 796
 797         if (gc) {
 798                 blkid_gc_cache(cache);
 799                 err = 0;
 800                 goto exit;
 801         }
 802         err = BLKID_EXIT_NOTFOUND;
 803
 804         if (eval == 0 && (output_format & OUTPUT_PRETTY_LIST)) {
 805                 if (lowprobe) {
 806                         fprintf(stderr, "The low-level probing mode does not "
 807                                         "support 'list' output format\n");
 808                         exit(BLKID_EXIT_OTHER);
 809                 }
 810                 pretty_print_dev(NULL);
 811         }
 812
 813         if (lowprobe) {
 814                 /*
 815                  * Low-level API
 816                  */
 817                 blkid_probe pr;
 818
 819                 if (!numdev) {
 820                         fprintf(stderr, "The low-level probing mode "
 821                                         "requires a device\n");
 822                         exit(BLKID_EXIT_OTHER);
 823                 }
 824
 825                 /* automatically enable 'export' format for I/O Limits */
 826                 if (!output_format  && (lowprobe & LOWPROBE_TOPOLOGY))
 827                         output_format = OUTPUT_EXPORT_LIST;
 828
 829                 pr = blkid_new_probe();
 830                 if (!pr)
 831                         goto exit;
 832
 833                 if (lowprobe & LOWPROBE_SUPERBLOCKS) {
 834                         blkid_probe_set_superblocks_flags(pr,
 835                                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 836                                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 837                                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 838
 839                         if (fltr_usage && blkid_probe_filter_superblocks_usage(
 840                                                 pr, fltr_flag, fltr_usage))
 841                                 goto exit;
 842
 843                         else if (fltr_type && blkid_probe_filter_superblocks_type(
 844                                                 pr, fltr_flag, fltr_type))
 845                                 goto exit;
 846                 }
 847
 848                 for (i = 0; i < numdev; i++) {
 849                         err = lowprobe_device(pr, devices[i], lowprobe, show,
 850                                         output_format,
 851                                         (uint64_t) offset,
 852                                         (uint64_t) size);
 853                         if (err)
 854                                 break;
 855                 }
 856                 blkid_free_probe(pr);
 857         } else if (eval) {
 858                 /*
 859                  * Evaluate API
 860                  */
 861                 char *res = blkid_evaluate_tag(search_type, search_value, NULL);
 862                 if (res) {
 863                         err = 0;
 864                         printf("%s\n", res);
 865                 }
 866         } else if (lookup) {
 867                 /*
 868                  * Classic (cache based) API
 869                  */
 870                 blkid_dev dev;
 871
 872                 if (!search_type) {
 873                         fprintf(stderr, "The lookup option requires a "
 874                                 "search type specified using -t\n");
 875                         exit(BLKID_EXIT_OTHER);
 876                 }
 877                 /* Load any additional devices not in the cache */
 878                 for (i = 0; i < numdev; i++)
 879                         blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
 880
 881                 if ((dev = blkid_find_dev_with_tag(cache, search_type,
 882                                                    search_value))) {
 883                         print_tags(dev, show, output_format);
 884                         err = 0;
 885                 }
 886         /* If we didn't specify a single device, show all available devices */
 887         } else if (!numdev) {
 888                 blkid_dev_iterate       iter;
 889                 blkid_dev               dev;
 890
 891                 blkid_probe_all(cache);
 892
 893                 iter = blkid_dev_iterate_begin(cache);
 894                 blkid_dev_set_search(iter, search_type, search_value);
 895                 while (blkid_dev_next(iter, &dev) == 0) {
 896                         dev = blkid_verify(cache, dev);
 897                         if (!dev)
 898                                 continue;
 899                         print_tags(dev, show, output_format);
 900                         err = 0;
 901                 }
 902                 blkid_dev_iterate_end(iter);
 903         /* Add all specified devices to cache (optionally display tags) */
 904         } else for (i = 0; i < numdev; i++) {
 905                 blkid_dev dev = blkid_get_dev(cache, devices[i],
 906                                                   BLKID_DEV_NORMAL);
 907
 908                 if (dev) {
 909                         if (search_type &&
 910                             !blkid_dev_has_tag(dev, search_type,
 911                                                search_value))
 912                                 continue;
 913                         print_tags(dev, show, output_format);
 914                         err = 0;
 915                 }
 916         }
 917
 918 exit:
 919         free(search_type);
 920         free(search_value);
 921         free_types_list(fltr_type);
 922         if (!lowprobe && !eval)
 923                 blkid_put_cache(cache);
 924         free(devices);
 925         return err;
 926 }