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_FULL             (1 << 0)
  23 #define OUTPUT_VALUE_ONLY       (1 << 1)
  24 #define OUTPUT_DEVICE_ONLY      (1 << 2)
  25 #define OUTPUT_PRETTY_LIST      (1 << 3)                /* deprecated */
  26 #define OUTPUT_UDEV_LIST        (1 << 4)                /* deprecated */
  27 #define OUTPUT_EXPORT_LIST      (1 << 5)
  28
  29 #define BLKID_EXIT_NOTFOUND     2       /* token or device not found */
  30 #define BLKID_EXIT_OTHER        4       /* bad usage or other error */
  31 #define BLKID_EXIT_AMBIVAL      8       /* ambivalent low-level probing detected */
  32
  33 #include <blkid.h>
  34
  35 #include "ismounted.h"
  36
  37 #include "strutils.h"
  38 #define OPTUTILS_EXIT_CODE      BLKID_EXIT_OTHER        /* exclusive_option() */
  39 #include "optutils.h"
  40 #define CLOSE_EXIT_CODE         BLKID_EXIT_OTHER        /* close_stdout() */
  41 #include "closestream.h"
  42
  43 #include "nls.h"
  44 #include "ttyutils.h"
  45
  46 #define XALLOC_EXIT_CODE    BLKID_EXIT_OTHER    /* x.*alloc(), xstrndup() */
  47 #include "xalloc.h"
  48
  49 struct blkid_control {
  50         int output;
  51         uintmax_t offset;
  52         uintmax_t size;
  53         char *show[128];
  54         unsigned int
  55                 eval:1,
  56                 gc:1,
  57                 lookup:1,
  58                 lowprobe:1,
  59                 lowprobe_superblocks:1,
  60                 lowprobe_topology:1,
  61                 no_part_details:1,
  62                 raw_chars:1;
  63 };
  64
  65 static void __attribute__((__noreturn__)) usage(void)
  66 {
  67         FILE *out = stdout;
  68
  69         fputs(USAGE_HEADER, out);
  70         fprintf(out, _( " %s --label <label> | --uuid <uuid>\n\n"), program_invocation_short_name);
  71         fprintf(out, _( " %s [--cache-file <file>] [-ghlLv] [--output <format>] [--match-tag <tag>] \n"
  72                         "       [--match-token <token>] [<dev> ...]\n\n"), program_invocation_short_name);
  73         fprintf(out, _( " %s -p [--match-tag <tag>] [--offset <offset>] [--size <size>] \n"
  74                         "       [--output <format>] <dev> ...\n\n"), program_invocation_short_name);
  75         fprintf(out, _( " %s -i [--match-tag <tag>] [--output <format>] <dev> ...\n"), program_invocation_short_name);
  76         fputs(USAGE_OPTIONS, out);
  77         fputs(_(        " -c, --cache-file <file>    read from <file> instead of reading from the default\n"
  78                         "                              cache file (-c /dev/null means no cache)\n"), out);
  79         fputs(_(        " -d, --no-encoding          don't encode non-printing characters\n"), out);
  80         fputs(_(        " -g, --garbage-collect      garbage collect the blkid cache\n"), out);
  81         fputs(_(        " -o, --output <format>      output format; can be one of:\n"
  82                         "                              value, device, export or full; (default: full)\n"), out);
  83         fputs(_(        " -k, --list-filesystems     list all known filesystems/RAIDs and exit\n"), out);
  84         fputs(_(        " -s, --match-tag <tag>      show specified tag(s) (default show all tags)\n"), out);
  85         fputs(_(        " -t, --match-token <token>  find device with a specific token (NAME=value pair)\n"), out);
  86         fputs(_(        " -l, --list-one             look up only first device with token specified by -t\n"), out);
  87         fputs(_(        " -L, --label <label>        convert LABEL to device name\n"), out);
  88         fputs(_(        " -U, --uuid <uuid>          convert UUID to device name\n"), out);
  89         fputs(_(        " <dev>                      specify device(s) to probe (default: all devices)\n"), out);
  90         fputs(          "\n", out);
  91         fputs(_(        "Low-level probing options:\n"), out);
  92         fputs(_(        " -p, --probe                low-level superblocks probing (bypass cache)\n"), out);
  93         fputs(_(        " -i, --info                 gather information about I/O limits\n"), out);
  94         fputs(_(        " -S, --size <size>          overwrite device size\n"), out);
  95         fputs(_(        " -O, --offset <offset>      probe at the given offset\n"), out);
  96         fputs(_(        " -u, --usages <list>        filter by \"usage\" (e.g. -u filesystem,raid)\n"), out);
  97         fputs(_(        " -n, --match-types <list>   filter by filesystem type (e.g. -n vfat,ext3)\n"), out);
  98         fputs(_(        " -D, --no-part-details      don't print info from partition table\n"), out);
  99
 100         fputs(USAGE_SEPARATOR, out);
 101         printf(USAGE_HELP_OPTIONS(28));
 102         printf(USAGE_MAN_TAIL("blkid(8)"));
 103         exit(EXIT_SUCCESS);
 104 }
 105
 106 /*
 107  * This function does "safe" printing.  It will convert non-printable
 108  * ASCII characters using '^' and M- notation.
 109  *
 110  * If 'esc' is defined then escape all chars from esc by \.
 111  */
 112 static void safe_print(const struct blkid_control *ctl, const char *cp, int len,
 113                        const char *esc)
 114 {
 115         unsigned char   ch;
 116
 117         if (len < 0)
 118                 len = strlen(cp);
 119
 120         while (len--) {
 121                 ch = *cp++;
 122                 if (!ctl->raw_chars) {
 123                         if (ch >= 128) {
 124                                 fputs("M-", stdout);
 125                                 ch -= 128;
 126                         }
 127                         if ((ch < 32) || (ch == 0x7f)) {
 128                                 fputc('^', stdout);
 129                                 ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
 130
 131                         } else if (esc && strchr(esc, ch))
 132                                 fputc('\\', stdout);
 133                 }
 134                 fputc(ch, stdout);
 135         }
 136 }
 137
 138 static int pretty_print_word(const char *str, int max_len,
 139                              int left_len, int overflow_nl)
 140 {
 141         int len = strlen(str) + left_len;
 142         int ret = 0;
 143
 144         fputs(str, stdout);
 145         if (overflow_nl && len > max_len) {
 146                 fputc('\n', stdout);
 147                 len = 0;
 148         } else if (len > max_len)
 149                 ret = len - max_len;
 150         do {
 151                 fputc(' ', stdout);
 152         } while (len++ < max_len);
 153         return ret;
 154 }
 155
 156 static void pretty_print_line(const char *device, const char *fs_type,
 157                               const char *label, const char *mtpt,
 158                               const char *uuid)
 159 {
 160         static int device_len = 10, fs_type_len = 7;
 161         static int label_len = 8, mtpt_len = 14;
 162         static int term_width = -1;
 163         int len, w;
 164
 165         if (term_width < 0) {
 166                 term_width = get_terminal_width(80);
 167         }
 168         if (term_width > 80) {
 169                 term_width -= 80;
 170                 w = term_width / 10;
 171                 if (w > 8)
 172                         w = 8;
 173                 term_width -= 2*w;
 174                 label_len += w;
 175                 fs_type_len += w;
 176                 w = term_width/2;
 177                 device_len += w;
 178                 mtpt_len +=w;
 179         }
 180
 181         len = pretty_print_word(device, device_len, 0, 1);
 182         len = pretty_print_word(fs_type, fs_type_len, len, 0);
 183         len = pretty_print_word(label, label_len, len, 0);
 184         pretty_print_word(mtpt, mtpt_len, len, 0);
 185
 186         fputs(uuid, stdout);
 187         fputc('\n', stdout);
 188 }
 189
 190 static void pretty_print_dev(blkid_dev dev)
 191 {
 192         blkid_tag_iterate       iter;
 193         const char              *type, *value, *devname;
 194         const char              *uuid = "", *fs_type = "", *label = "";
 195         int                     len, mount_flags;
 196         char                    mtpt[80];
 197         int                     retval;
 198
 199         if (dev == NULL) {
 200                 pretty_print_line("device", "fs_type", "label",
 201                                   "mount point", "UUID");
 202                 for (len=get_terminal_width(0)-1; len > 0; len--)
 203                         fputc('-', stdout);
 204                 fputc('\n', stdout);
 205                 return;
 206         }
 207
 208         devname = blkid_dev_devname(dev);
 209         if (access(devname, F_OK))
 210                 return;
 211
 212         /* Get the uuid, label, type */
 213         iter = blkid_tag_iterate_begin(dev);
 214         while (blkid_tag_next(iter, &type, &value) == 0) {
 215                 if (!strcmp(type, "UUID"))
 216                         uuid = value;
 217                 if (!strcmp(type, "TYPE"))
 218                         fs_type = value;
 219                 if (!strcmp(type, "LABEL"))
 220                         label = value;
 221         }
 222         blkid_tag_iterate_end(iter);
 223
 224         /* Get the mount point */
 225         mtpt[0] = 0;
 226         retval = check_mount_point(devname, &mount_flags, mtpt, sizeof(mtpt));
 227         if (retval == 0) {
 228                 if (mount_flags & MF_MOUNTED) {
 229                         if (!mtpt[0])
 230                                 strcpy(mtpt, _("(mounted, mtpt unknown)"));
 231                 } else if (mount_flags & MF_BUSY)
 232                         strcpy(mtpt, _("(in use)"));
 233                 else
 234                         strcpy(mtpt, _("(not mounted)"));
 235         }
 236
 237         pretty_print_line(devname, fs_type, label, mtpt, uuid);
 238 }
 239
 240 static void print_udev_format(const char *name, const char *value)
 241 {
 242         char enc[265], safe[256];
 243         size_t namelen = strlen(name);
 244
 245         *safe = *enc = '\0';
 246
 247         if (!strcmp(name, "TYPE") || !strcmp(name, "VERSION")) {
 248                 blkid_encode_string(value, enc, sizeof(enc));
 249                 printf("ID_FS_%s=%s\n", name, enc);
 250
 251         } else if (!strcmp(name, "UUID") ||
 252                  !strncmp(name, "LABEL", 5) ||
 253                  !strcmp(name, "UUID_SUB")) {
 254
 255                 blkid_safe_string(value, safe, sizeof(safe));
 256                 printf("ID_FS_%s=%s\n", name, safe);
 257
 258                 blkid_encode_string(value, enc, sizeof(enc));
 259                 printf("ID_FS_%s_ENC=%s\n", name, enc);
 260
 261         } else if (!strcmp(name, "PTUUID")) {
 262                 printf("ID_PART_TABLE_UUID=%s\n", value);
 263
 264         } else if (!strcmp(name, "PTTYPE")) {
 265                 printf("ID_PART_TABLE_TYPE=%s\n", value);
 266
 267         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
 268                   !strcmp(name, "PART_ENTRY_TYPE")) {
 269
 270                 blkid_encode_string(value, enc, sizeof(enc));
 271                 printf("ID_%s=%s\n", name, enc);
 272
 273         } else if (!strncmp(name, "PART_ENTRY_", 11))
 274                 printf("ID_%s=%s\n", name, value);
 275
 276         else if (namelen >= 15 && (
 277                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
 278                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
 279                    !strcmp(name, "ALIGNMENT_OFFSET")))
 280                         printf("ID_IOLIMIT_%s=%s\n", name, value);
 281         else
 282                 printf("ID_FS_%s=%s\n", name, value);
 283 }
 284
 285 static int has_item(const struct blkid_control *ctl, const char *item)
 286 {
 287         char * const *p;
 288
 289         for (p = ctl->show; *p != NULL; p++)
 290                 if (!strcmp(item, *p))
 291                         return 1;
 292         return 0;
 293 }
 294
 295 static void print_value(const struct blkid_control *ctl, int num,
 296                         const char *devname, const char *value,
 297                         const char *name, size_t valsz)
 298 {
 299         if (ctl->output & OUTPUT_VALUE_ONLY) {
 300                 fputs(value, stdout);
 301                 fputc('\n', stdout);
 302
 303         } else if (ctl->output & OUTPUT_UDEV_LIST) {
 304                 print_udev_format(name, value);
 305
 306         } else if (ctl->output & OUTPUT_EXPORT_LIST) {
 307                 if (num == 1 && devname)
 308                         printf("DEVNAME=%s\n", devname);
 309                 fputs(name, stdout);
 310                 fputs("=", stdout);
 311                 safe_print(ctl, value, valsz, " \\\"'$`<>");
 312                 fputs("\n", stdout);
 313
 314         } else {
 315                 if (num == 1 && devname)
 316                         printf("%s:", devname);
 317                 fputs(" ", stdout);
 318                 fputs(name, stdout);
 319                 fputs("=\"", stdout);
 320                 safe_print(ctl, value, valsz, "\"\\");
 321                 fputs("\"", stdout);
 322         }
 323 }
 324
 325 static void print_tags(const struct blkid_control *ctl, blkid_dev dev)
 326 {
 327         blkid_tag_iterate       iter;
 328         const char              *type, *value, *devname;
 329         int                     num = 1;
 330         static int              first = 1;
 331
 332         if (!dev)
 333                 return;
 334
 335         if (ctl->output & OUTPUT_PRETTY_LIST) {
 336                 pretty_print_dev(dev);
 337                 return;
 338         }
 339
 340         devname = blkid_dev_devname(dev);
 341
 342         if (ctl->output & OUTPUT_DEVICE_ONLY) {
 343                 printf("%s\n", devname);
 344                 return;
 345         }
 346
 347         iter = blkid_tag_iterate_begin(dev);
 348         while (blkid_tag_next(iter, &type, &value) == 0) {
 349                 if (ctl->show[0] && !has_item(ctl, type))
 350                         continue;
 351
 352                 if (num == 1 && !first &&
 353                     (ctl->output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 354                         /* add extra line between output from more devices */
 355                         fputc('\n', stdout);
 356
 357                 print_value(ctl, num++, devname, value, type, strlen(value));
 358         }
 359         blkid_tag_iterate_end(iter);
 360
 361         if (num > 1) {
 362                 if (!(ctl->output & (OUTPUT_VALUE_ONLY | OUTPUT_UDEV_LIST |
 363                                                 OUTPUT_EXPORT_LIST)))
 364                         printf("\n");
 365                 first = 0;
 366         }
 367 }
 368
 369
 370 static int append_str(char **res, size_t *sz, const char *a, const char *b)
 371 {
 372         char *str = *res;
 373         size_t asz = a ? strlen(a) : 0;
 374         size_t bsz = b ? strlen(b) : 0;
 375         size_t len = *sz + asz + bsz;
 376
 377         if (!len)
 378                 return -1;
 379
 380         *res = str = xrealloc(str, len + 1);
 381         str += *sz;
 382
 383         if (a) {
 384                 memcpy(str, a, asz);
 385                 str += asz;
 386         }
 387         if (b) {
 388                 memcpy(str, b, bsz);
 389                 str += bsz;
 390         }
 391         *str = '\0';
 392         *sz = len;
 393         return 0;
 394 }
 395
 396 /*
 397  * Compose and print ID_FS_AMBIVALENT for udev
 398  */
 399 static int print_udev_ambivalent(blkid_probe pr)
 400 {
 401         char *val = NULL;
 402         size_t valsz = 0;
 403         int count = 0, rc = -1;
 404
 405         while (!blkid_do_probe(pr)) {
 406                 const char *usage_txt = NULL, *type = NULL, *version = NULL;
 407                 char enc[256];
 408
 409                 blkid_probe_lookup_value(pr, "USAGE", &usage_txt, NULL);
 410                 blkid_probe_lookup_value(pr, "TYPE", &type, NULL);
 411                 blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
 412
 413                 if (!usage_txt || !type)
 414                         continue;
 415
 416                 blkid_encode_string(usage_txt, enc, sizeof(enc));
 417                 if (append_str(&val, &valsz, enc, ":"))
 418                         goto done;
 419
 420                 blkid_encode_string(type, enc, sizeof(enc));
 421                 if (append_str(&val, &valsz, enc, version ? ":" : " "))
 422                         goto done;
 423
 424                 if (version) {
 425                         blkid_encode_string(version, enc, sizeof(enc));
 426                         if (append_str(&val, &valsz, enc, " "))
 427                                 goto done;
 428                 }
 429                 count++;
 430         }
 431
 432         if (count > 1) {
 433                 *(val + valsz - 1) = '\0';              /* rem tailing whitespace */
 434                 printf("ID_FS_AMBIVALENT=%s\n", val);
 435                 rc = 0;
 436         }
 437 done:
 438         free(val);
 439         return rc;
 440 }
 441
 442 static int lowprobe_superblocks(blkid_probe pr, struct blkid_control *ctl)
 443 {
 444         struct stat st;
 445         int rc, fd = blkid_probe_get_fd(pr);
 446
 447         if (fd < 0 || fstat(fd, &st))
 448                 return -1;
 449
 450         blkid_probe_enable_partitions(pr, 1);
 451
 452         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
 453             blkid_probe_is_wholedisk(pr)) {
 454                 /*
 455                  * check if the small disk is partitioned, if yes then
 456                  * don't probe for filesystems.
 457                  */
 458                 blkid_probe_enable_superblocks(pr, 0);
 459
 460                 rc = blkid_do_fullprobe(pr);
 461                 if (rc < 0)
 462                         return rc;      /* -1 = error, 1 = nothing, 0 = success */
 463
 464                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 465                         return 0;       /* partition table detected */
 466         }
 467
 468         if (!ctl->no_part_details)
 469                 blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 470         blkid_probe_enable_superblocks(pr, 1);
 471
 472         return blkid_do_safeprobe(pr);
 473 }
 474
 475 static int lowprobe_topology(blkid_probe pr)
 476 {
 477         /* enable topology probing only */
 478         blkid_probe_enable_topology(pr, 1);
 479
 480         blkid_probe_enable_superblocks(pr, 0);
 481         blkid_probe_enable_partitions(pr, 0);
 482
 483         return blkid_do_fullprobe(pr);
 484 }
 485
 486 static int lowprobe_device(blkid_probe pr, const char *devname,
 487                            struct blkid_control *ctl)
 488 {
 489         const char *data;
 490         const char *name;
 491         int nvals = 0, n, num = 1;
 492         size_t len;
 493         int fd;
 494         int rc = 0;
 495         static int first = 1;
 496
 497         fd = open(devname, O_RDONLY|O_CLOEXEC);
 498         if (fd < 0) {
 499                 warn(_("error: %s"), devname);
 500                 return BLKID_EXIT_NOTFOUND;
 501         }
 502         if (blkid_probe_set_device(pr, fd, ctl->offset, ctl->size))
 503                 goto done;
 504
 505         if (ctl->lowprobe_topology)
 506                 rc = lowprobe_topology(pr);
 507         if (rc >= 0 && ctl->lowprobe_superblocks)
 508                 rc = lowprobe_superblocks(pr, ctl);
 509         if (rc < 0)
 510                 goto done;
 511
 512         if (!rc)
 513                 nvals = blkid_probe_numof_values(pr);
 514
 515         if (nvals && !first && ctl->output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST))
 516                 /* add extra line between output from devices */
 517                 fputc('\n', stdout);
 518
 519         if (nvals && (ctl->output & OUTPUT_DEVICE_ONLY)) {
 520                 printf("%s\n", devname);
 521                 goto done;
 522         }
 523
 524         for (n = 0; n < nvals; n++) {
 525                 if (blkid_probe_get_value(pr, n, &name, &data, &len))
 526                         continue;
 527                 if (ctl->show[0] && !has_item(ctl, name))
 528                         continue;
 529                 len = strnlen(data, len);
 530                 print_value(ctl, num++, devname, data, name, len);
 531         }
 532
 533         if (first)
 534                 first = 0;
 535
 536         if (nvals >= 1 && !(ctl->output & (OUTPUT_VALUE_ONLY |
 537                                         OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 538                 printf("\n");
 539 done:
 540         if (rc == -2) {
 541                 if (ctl->output & OUTPUT_UDEV_LIST)
 542                         print_udev_ambivalent(pr);
 543                 else
 544                         warnx(_("%s: ambivalent result (probably more "
 545                                 "filesystems on the device, use wipefs(8) "
 546                                 "to see more details)"),
 547                                 devname);
 548         }
 549         close(fd);
 550
 551         if (rc == -2)
 552                 return BLKID_EXIT_AMBIVAL;      /* ambivalent probing result */
 553         if (!nvals)
 554                 return BLKID_EXIT_NOTFOUND;     /* nothing detected */
 555
 556         return 0;               /* success */
 557 }
 558
 559 /* converts comma separated list to BLKID_USAGE_* mask */
 560 static int list_to_usage(const char *list, int *flag)
 561 {
 562         int mask = 0;
 563         const char *word = NULL, *p = list;
 564
 565         if (p && strncmp(p, "no", 2) == 0) {
 566                 *flag = BLKID_FLTR_NOTIN;
 567                 p += 2;
 568         }
 569         if (!p || !*p)
 570                 goto err;
 571         while(p) {
 572                 word = p;
 573                 p = strchr(p, ',');
 574                 if (p)
 575                         p++;
 576                 if (!strncmp(word, "filesystem", 10))
 577                         mask |= BLKID_USAGE_FILESYSTEM;
 578                 else if (!strncmp(word, "raid", 4))
 579                         mask |= BLKID_USAGE_RAID;
 580                 else if (!strncmp(word, "crypto", 6))
 581                         mask |= BLKID_USAGE_CRYPTO;
 582                 else if (!strncmp(word, "other", 5))
 583                         mask |= BLKID_USAGE_OTHER;
 584                 else
 585                         goto err;
 586         }
 587         return mask;
 588 err:
 589         *flag = 0;
 590         warnx(_("unknown keyword in -u <list> argument: '%s'"),
 591                         word ? word : list);
 592         exit(BLKID_EXIT_OTHER);
 593 }
 594
 595 /* converts comma separated list to types[] */
 596 static char **list_to_types(const char *list, int *flag)
 597 {
 598         int i;
 599         const char *p = list;
 600         char **res = NULL;
 601
 602         if (p && strncmp(p, "no", 2) == 0) {
 603                 *flag = BLKID_FLTR_NOTIN;
 604                 p += 2;
 605         }
 606         if (!p || !*p) {
 607                 warnx(_("error: -u <list> argument is empty"));
 608                 goto err;
 609         }
 610         for (i = 1; p && (p = strchr(p, ',')); i++, p++);
 611
 612         res = xcalloc(i + 1, sizeof(char *));
 613         p = *flag & BLKID_FLTR_NOTIN ? list + 2 : list;
 614         i = 0;
 615
 616         while(p) {
 617                 const char *word = p;
 618                 p = strchr(p, ',');
 619                 res[i++] = p ? xstrndup(word, p - word) : xstrdup(word);
 620                 if (p)
 621                         p++;
 622         }
 623         res[i] = NULL;
 624         return res;
 625 err:
 626         *flag = 0;
 627         free(res);
 628         exit(BLKID_EXIT_OTHER);
 629 }
 630
 631 static void free_types_list(char *list[])
 632 {
 633         char **n;
 634
 635         if (!list)
 636                 return;
 637         for (n = list; *n; n++)
 638                 free(*n);
 639         free(list);
 640 }
 641
 642 int main(int argc, char **argv)
 643 {
 644         struct blkid_control ctl = { .output = OUTPUT_FULL, 0 };
 645         blkid_cache cache = NULL;
 646         char **devices = NULL;
 647         char *search_type = NULL, *search_value = NULL;
 648         char *read = NULL;
 649         int fltr_usage = 0;
 650         char **fltr_type = NULL;
 651         int fltr_flag = BLKID_FLTR_ONLYIN;
 652         unsigned int numdev = 0, numtag = 0;
 653         int err = BLKID_EXIT_OTHER;
 654         unsigned int i;
 655         int c;
 656
 657         static const struct option longopts[] = {
 658                 { "cache-file",       required_argument, NULL, 'c' },
 659                 { "no-encoding",      no_argument,       NULL, 'd' },
 660                 { "no-part-details",  no_argument,       NULL, 'D' },
 661                 { "garbage-collect",  no_argument,       NULL, 'g' },
 662                 { "output",           required_argument, NULL, 'o' },
 663                 { "list-filesystems", no_argument,       NULL, 'k' },
 664                 { "match-tag",        required_argument, NULL, 's' },
 665                 { "match-token",      required_argument, NULL, 't' },
 666                 { "list-one",         no_argument,       NULL, 'l' },
 667                 { "label",            required_argument, NULL, 'L' },
 668                 { "uuid",             required_argument, NULL, 'U' },
 669                 { "probe",            no_argument,       NULL, 'p' },
 670                 { "info",             no_argument,       NULL, 'i' },
 671                 { "size",             required_argument, NULL, 'S' },
 672                 { "offset",           required_argument, NULL, 'O' },
 673                 { "usages",           required_argument, NULL, 'u' },
 674                 { "match-types",      required_argument, NULL, 'n' },
 675                 { "version",          no_argument,       NULL, 'V' },
 676                 { "help",             no_argument,       NULL, 'h' },
 677                 { NULL, 0, NULL, 0 }
 678         };
 679
 680         static const ul_excl_t excl[] = {       /* rows and cols in ASCII order */
 681                 { 'n','u' },
 682                 { 0 }
 683         };
 684         int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
 685
 686         setlocale(LC_ALL, "");
 687         bindtextdomain(PACKAGE, LOCALEDIR);
 688         textdomain(PACKAGE);
 689         close_stdout_atexit();
 690
 691         strutils_set_exitcode(BLKID_EXIT_OTHER);
 692
 693         while ((c = getopt_long (argc, argv,
 694                             "c:DdghilL:n:ko:O:ps:S:t:u:U:w:Vv", longopts, NULL)) != -1) {
 695
 696                 err_exclusive_options(c, NULL, excl, excl_st);
 697
 698                 switch (c) {
 699                 case 'c':
 700                         read = optarg;
 701                         break;
 702                 case 'd':
 703                         ctl.raw_chars = 1;
 704                         break;
 705                 case 'D':
 706                         ctl.no_part_details = 1;
 707                         break;
 708                 case 'L':
 709                         ctl.eval = 1;
 710                         search_value = xstrdup(optarg);
 711                         search_type = xstrdup("LABEL");
 712                         break;
 713                 case 'n':
 714                         fltr_type = list_to_types(optarg, &fltr_flag);
 715                         break;
 716                 case 'u':
 717                         fltr_usage = list_to_usage(optarg, &fltr_flag);
 718                         break;
 719                 case 'U':
 720                         ctl.eval = 1;
 721                         search_value = xstrdup(optarg);
 722                         search_type = xstrdup("UUID");
 723                         break;
 724                 case 'i':
 725                         ctl.lowprobe_topology = 1;
 726                         break;
 727                 case 'l':
 728                         ctl.lookup = 1;
 729                         break;
 730                 case 'g':
 731                         ctl.gc = 1;
 732                         break;
 733                 case 'k':
 734                 {
 735                         size_t idx = 0;
 736                         const char *name = NULL;
 737
 738                         while (blkid_superblocks_get_name(idx++, &name, NULL) == 0)
 739                                 printf("%s\n", name);
 740                         exit(EXIT_SUCCESS);
 741                 }
 742                 case 'o':
 743                         if (!strcmp(optarg, "value"))
 744                                 ctl.output = OUTPUT_VALUE_ONLY;
 745                         else if (!strcmp(optarg, "device"))
 746                                 ctl.output = OUTPUT_DEVICE_ONLY;
 747                         else if (!strcmp(optarg, "list"))
 748                                 ctl.output = OUTPUT_PRETTY_LIST;        /* deprecated */
 749                         else if (!strcmp(optarg, "udev"))
 750                                 ctl.output = OUTPUT_UDEV_LIST;
 751                         else if (!strcmp(optarg, "export"))
 752                                 ctl.output = OUTPUT_EXPORT_LIST;
 753                         else if (!strcmp(optarg, "full"))
 754                                 ctl.output = 0;
 755                         else
 756                                 errx(BLKID_EXIT_OTHER, _("unsupported output format %s"), optarg);
 757                         break;
 758                 case 'O':
 759                         ctl.offset = strtosize_or_err(optarg, _("invalid offset argument"));
 760                         break;
 761                 case 'p':
 762                         ctl.lowprobe_superblocks = 1;
 763                         break;
 764                 case 's':
 765                         if (numtag + 1 >= sizeof(ctl.show) / sizeof(*ctl.show)) {
 766                                 warnx(_("Too many tags specified"));
 767                                 errtryhelp(err);
 768                         }
 769                         ctl.show[numtag++] = optarg;
 770                         break;
 771                 case 'S':
 772                         ctl.size = strtosize_or_err(optarg, _("invalid size argument"));
 773                         break;
 774                 case 't':
 775                         if (search_type) {
 776                                 warnx(_("Can only search for "
 777                                         "one NAME=value pair"));
 778                                 errtryhelp(err);
 779                         }
 780                         if (blkid_parse_tag_string(optarg,
 781                                                    &search_type,
 782                                                    &search_value)) {
 783                                 warnx(_("-t needs NAME=value pair"));
 784                                 errtryhelp(err);
 785                         }
 786                         break;
 787                 case 'V':
 788                 case 'v':
 789                         fprintf(stdout, _("%s from %s  (libblkid %s, %s)\n"),
 790                                 program_invocation_short_name, PACKAGE_STRING,
 791                                 LIBBLKID_VERSION, LIBBLKID_DATE);
 792                         err = 0;
 793                         goto exit;
 794                 case 'w':
 795                         /* ignore - backward compatibility */
 796                         break;
 797                 case 'h':
 798                         usage();
 799                         break;
 800                 default:
 801                         errtryhelp(EXIT_FAILURE);
 802                 }
 803         }
 804
 805         if (ctl.lowprobe_topology || ctl.lowprobe_superblocks)
 806                 ctl.lowprobe = 1;
 807
 808         /* The rest of the args are device names */
 809         if (optind < argc) {
 810                 devices = xcalloc(argc - optind, sizeof(char *));
 811                 while (optind < argc)
 812                         devices[numdev++] = argv[optind++];
 813         }
 814
 815         /* convert LABEL/UUID lookup to evaluate request */
 816         if (ctl.lookup && ctl.output == OUTPUT_DEVICE_ONLY && search_type &&
 817             (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
 818                 ctl.eval = 1;
 819                 ctl.lookup = 0;
 820         }
 821
 822         if (!ctl.lowprobe && !ctl.eval && blkid_get_cache(&cache, read) < 0)
 823                 goto exit;
 824
 825         if (ctl.gc) {
 826                 blkid_gc_cache(cache);
 827                 err = 0;
 828                 goto exit;
 829         }
 830         err = BLKID_EXIT_NOTFOUND;
 831
 832         if (ctl.eval == 0 && (ctl.output & OUTPUT_PRETTY_LIST)) {
 833                 if (ctl.lowprobe)
 834                         errx(BLKID_EXIT_OTHER,
 835                              _("The low-level probing mode does not "
 836                                "support 'list' output format"));
 837                 pretty_print_dev(NULL);
 838         }
 839
 840         if (ctl.lowprobe) {
 841                 /*
 842                  * Low-level API
 843                  */
 844                 blkid_probe pr;
 845
 846                 if (!numdev)
 847                         errx(BLKID_EXIT_OTHER,
 848                              _("The low-level probing mode "
 849                                "requires a device"));
 850
 851                 /* automatically enable 'export' format for I/O Limits */
 852                 if (!ctl.output  && ctl.lowprobe_topology)
 853                         ctl.output = OUTPUT_EXPORT_LIST;
 854
 855                 pr = blkid_new_probe();
 856                 if (!pr)
 857                         goto exit;
 858
 859                 if (ctl.lowprobe_superblocks) {
 860                         blkid_probe_set_superblocks_flags(pr,
 861                                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 862                                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 863                                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 864
 865
 866                         if (fltr_usage &&
 867                             blkid_probe_filter_superblocks_usage(pr, fltr_flag, fltr_usage))
 868                                 goto exit;
 869
 870                         else if (fltr_type &&
 871                                  blkid_probe_filter_superblocks_type(pr, fltr_flag, fltr_type))
 872                                 goto exit;
 873                 }
 874
 875                 for (i = 0; i < numdev; i++) {
 876                         err = lowprobe_device(pr, devices[i], &ctl);
 877                         if (err)
 878                                 break;
 879                 }
 880                 blkid_free_probe(pr);
 881         } else if (ctl.eval) {
 882                 /*
 883                  * Evaluate API
 884                  */
 885                 char *res = blkid_evaluate_tag(search_type, search_value, NULL);
 886                 if (res) {
 887                         err = 0;
 888                         printf("%s\n", res);
 889                 }
 890         } else if (ctl.lookup) {
 891                 /*
 892                  * Classic (cache based) API
 893                  */
 894                 blkid_dev dev;
 895
 896                 if (!search_type)
 897                         errx(BLKID_EXIT_OTHER,
 898                              _("The lookup option requires a "
 899                                "search type specified using -t"));
 900                 /* Load any additional devices not in the cache */
 901                 for (i = 0; i < numdev; i++)
 902                         blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
 903
 904                 if ((dev = blkid_find_dev_with_tag(cache, search_type,
 905                                                    search_value))) {
 906                         print_tags(&ctl, dev);
 907                         err = 0;
 908                 }
 909         /* If we didn't specify a single device, show all available devices */
 910         } else if (!numdev) {
 911                 blkid_dev_iterate       iter;
 912                 blkid_dev               dev;
 913
 914                 blkid_probe_all(cache);
 915
 916                 iter = blkid_dev_iterate_begin(cache);
 917                 blkid_dev_set_search(iter, search_type, search_value);
 918                 while (blkid_dev_next(iter, &dev) == 0) {
 919                         dev = blkid_verify(cache, dev);
 920                         if (!dev)
 921                                 continue;
 922                         print_tags(&ctl, dev);
 923                         err = 0;
 924                 }
 925                 blkid_dev_iterate_end(iter);
 926         /* Add all specified devices to cache (optionally display tags) */
 927         } else for (i = 0; i < numdev; i++) {
 928                 blkid_dev dev = blkid_get_dev(cache, devices[i],
 929                                                   BLKID_DEV_NORMAL);
 930
 931                 if (dev) {
 932                         if (search_type &&
 933                             !blkid_dev_has_tag(dev, search_type,
 934                                                search_value))
 935                                 continue;
 936                         print_tags(&ctl, dev);
 937                         err = 0;
 938                 }
 939         }
 940
 941 exit:
 942         free(search_type);
 943         free(search_value);
 944         free_types_list(fltr_type);
 945         if (!ctl.lowprobe && !ctl.eval)
 946                 blkid_put_cache(cache);
 947         free(devices);
 948         return err;
 949 }