misc-utils/blkid.c

   1 /*
   2  * blkid.c - User command-line interface for libblkid
   3  *
   4  * Copyright (C) 2001 Andreas Dilger
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the
   8  * GNU Lesser General Public License.
   9  * %End-Header%
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <string.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <fcntl.h>
  19 #include <errno.h>
  20 #ifdef HAVE_GETOPT_H
  21 #include <getopt.h>
  22 #else
  23 extern int getopt(int argc, char * const argv[], const char *optstring);
  24 extern char *optarg;
  25 extern int optind;
  26 #endif
  27
  28 #define OUTPUT_VALUE_ONLY       (1 << 1)
  29 #define OUTPUT_DEVICE_ONLY      (1 << 2)
  30 #define OUTPUT_PRETTY_LIST      (1 << 3)                /* deprecated */
  31 #define OUTPUT_UDEV_LIST        (1 << 4)                /* deprecated */
  32 #define OUTPUT_EXPORT_LIST      (1 << 5)
  33
  34 #define LOWPROBE_TOPOLOGY       (1 << 1)
  35 #define LOWPROBE_SUPERBLOCKS    (1 << 2)
  36
  37 #define BLKID_EXIT_NOTFOUND     2       /* token or device not found */
  38 #define BLKID_EXIT_OTHER        4       /* bad usage or other error */
  39 #define BLKID_EXIT_AMBIVAL      8       /* ambivalent low-level probing detected */
  40
  41 #include <blkid.h>
  42
  43 #include "ismounted.h"
  44
  45 #define STRTOXX_EXIT_CODE       BLKID_EXIT_OTHER        /* strtoxx_or_err() */
  46 #include "strutils.h"
  47 #define OPTUTILS_EXIT_CODE      BLKID_EXIT_OTHER        /* exclusive_option() */
  48 #include "optutils.h"
  49
  50 #include "closestream.h"
  51 #include "ttyutils.h"
  52
  53 const char *progname = "blkid";
  54
  55 int raw_chars;
  56
  57 static void print_version(FILE *out)
  58 {
  59         fprintf(out, "%s from %s  (libblkid %s, %s)\n",
  60                 program_invocation_short_name, PACKAGE_STRING,
  61                 LIBBLKID_VERSION, LIBBLKID_DATE);
  62 }
  63
  64 static void usage(int error)
  65 {
  66         FILE *out = error ? stderr : stdout;
  67
  68         print_version(out);
  69         fprintf(out,
  70                 "Usage:\n"
  71                 " %1$s -L <label> | -U <uuid>\n\n"
  72                 " %1$s [-c <file>] [-ghlLv] [-o <format>] [-s <tag>] \n"
  73                 "       [-t <token>] [<dev> ...]\n\n"
  74                 " %1$s -p [-s <tag>] [-O <offset>] [-S <size>] \n"
  75                 "       [-o <format>] <dev> ...\n\n"
  76                 " %1$s -i [-s <tag>] [-o <format>] <dev> ...\n\n"
  77                 "Options:\n"
  78                 " -c <file>   read from <file> instead of reading from the default\n"
  79                 "               cache file (-c /dev/null means no cache)\n"
  80                 " -d          don't encode non-printing characters\n"
  81                 " -h          print this usage message and exit\n"
  82                 " -g          garbage collect the blkid cache\n"
  83                 " -o <format> output format; can be one of:\n"
  84                 "               value, device, export or full; (default: full)\n"
  85                 " -k          list all known filesystems/RAIDs and exit\n"
  86                 " -s <tag>    show specified tag(s) (default show all tags)\n"
  87                 " -t <token>  find device with a specific token (NAME=value pair)\n"
  88                 " -l          look up only first device with token specified by -t\n"
  89                 " -L <label>  convert LABEL to device name\n"
  90                 " -U <uuid>   convert UUID to device name\n"
  91                 " -v          print version and exit\n"
  92                 " <dev>       specify device(s) to probe (default: all devices)\n\n"
  93                 "Low-level probing options:\n"
  94                 " -p          low-level superblocks probing (bypass cache)\n"
  95                 " -i          gather information about I/O limits\n"
  96                 " -S <size>   overwrite device size\n"
  97                 " -O <offset> probe at the given offset\n"
  98                 " -u <list>   filter by \"usage\" (e.g. -u filesystem,raid)\n"
  99                 " -n <list>   filter by filesystem type (e.g. -n vfat,ext3)\n"
 100                 "\n", progname);
 101
 102         exit(error);
 103 }
 104
 105 /*
 106  * This function does "safe" printing.  It will convert non-printable
 107  * ASCII characters using '^' and M- notation.
 108  */
 109 static void safe_print(const char *cp, int len)
 110 {
 111         unsigned char   ch;
 112
 113         if (len < 0)
 114                 len = strlen(cp);
 115
 116         while (len--) {
 117                 ch = *cp++;
 118                 if (!raw_chars) {
 119                         if (ch >= 128) {
 120                                 fputs("M-", stdout);
 121                                 ch -= 128;
 122                         }
 123                         if ((ch < 32) || (ch == 0x7f)) {
 124                                 fputc('^', stdout);
 125                                 ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
 126                         }
 127                 }
 128                 fputc(ch, stdout);
 129         }
 130 }
 131
 132 static int pretty_print_word(const char *str, int max_len,
 133                              int left_len, int overflow_nl)
 134 {
 135         int len = strlen(str) + left_len;
 136         int ret = 0;
 137
 138         fputs(str, stdout);
 139         if (overflow_nl && len > max_len) {
 140                 fputc('\n', stdout);
 141                 len = 0;
 142         } else if (len > max_len)
 143                 ret = len - max_len;
 144         do
 145                 fputc(' ', stdout);
 146         while (len++ < max_len);
 147         return ret;
 148 }
 149
 150 static void pretty_print_line(const char *device, const char *fs_type,
 151                               const char *label, const char *mtpt,
 152                               const char *uuid)
 153 {
 154         static int device_len = 10, fs_type_len = 7;
 155         static int label_len = 8, mtpt_len = 14;
 156         static int term_width = -1;
 157         int len, w;
 158
 159         if (term_width < 0) {
 160                 term_width = get_terminal_width();
 161                 if (term_width <= 0)
 162                         term_width = 80;
 163         }
 164         if (term_width > 80) {
 165                 term_width -= 80;
 166                 w = term_width / 10;
 167                 if (w > 8)
 168                         w = 8;
 169                 term_width -= 2*w;
 170                 label_len += w;
 171                 fs_type_len += w;
 172                 w = term_width/2;
 173                 device_len += w;
 174                 mtpt_len +=w;
 175         }
 176
 177         len = pretty_print_word(device, device_len, 0, 1);
 178         len = pretty_print_word(fs_type, fs_type_len, len, 0);
 179         len = pretty_print_word(label, label_len, len, 0);
 180         pretty_print_word(mtpt, mtpt_len, len, 0);
 181
 182         fputs(uuid, stdout);
 183         fputc('\n', stdout);
 184 }
 185
 186 static void pretty_print_dev(blkid_dev dev)
 187 {
 188         blkid_tag_iterate       iter;
 189         const char              *type, *value, *devname;
 190         const char              *uuid = "", *fs_type = "", *label = "";
 191         int                     len, mount_flags;
 192         char                    mtpt[80];
 193         int                     retval;
 194
 195         if (dev == NULL) {
 196                 pretty_print_line("device", "fs_type", "label",
 197                                   "mount point", "UUID");
 198                 for (len=get_terminal_width()-1; len > 0; len--)
 199                         fputc('-', stdout);
 200                 fputc('\n', stdout);
 201                 return;
 202         }
 203
 204         devname = blkid_dev_devname(dev);
 205         if (access(devname, F_OK))
 206                 return;
 207
 208         /* Get the uuid, label, type */
 209         iter = blkid_tag_iterate_begin(dev);
 210         while (blkid_tag_next(iter, &type, &value) == 0) {
 211                 if (!strcmp(type, "UUID"))
 212                         uuid = value;
 213                 if (!strcmp(type, "TYPE"))
 214                         fs_type = value;
 215                 if (!strcmp(type, "LABEL"))
 216                         label = value;
 217         }
 218         blkid_tag_iterate_end(iter);
 219
 220         /* Get the mount point */
 221         mtpt[0] = 0;
 222         retval = check_mount_point(devname, &mount_flags, mtpt, sizeof(mtpt));
 223         if (retval == 0) {
 224                 if (mount_flags & MF_MOUNTED) {
 225                         if (!mtpt[0])
 226                                 strcpy(mtpt, "(mounted, mtpt unknown)");
 227                 } else if (mount_flags & MF_BUSY)
 228                         strcpy(mtpt, "(in use)");
 229                 else
 230                         strcpy(mtpt, "(not mounted)");
 231         }
 232
 233         pretty_print_line(devname, fs_type, label, mtpt, uuid);
 234 }
 235
 236 static void print_udev_format(const char *name, const char *value)
 237 {
 238         char enc[265], safe[256];
 239         size_t namelen = strlen(name);
 240
 241         *safe = *enc = '\0';
 242
 243         if (!strcmp(name, "TYPE") || !strcmp(name, "VERSION")) {
 244                 blkid_encode_string(value, enc, sizeof(enc));
 245                 printf("ID_FS_%s=%s\n", name, enc);
 246
 247         } else if (!strcmp(name, "UUID") ||
 248                  !strcmp(name, "LABEL") ||
 249                  !strcmp(name, "UUID_SUB")) {
 250
 251                 blkid_safe_string(value, safe, sizeof(safe));
 252                 printf("ID_FS_%s=%s\n", name, safe);
 253
 254                 blkid_encode_string(value, enc, sizeof(enc));
 255                 printf("ID_FS_%s_ENC=%s\n", name, enc);
 256
 257         } else if (!strcmp(name, "PTTYPE")) {
 258                 printf("ID_PART_TABLE_TYPE=%s\n", value);
 259
 260         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
 261                   !strcmp(name, "PART_ENTRY_TYPE")) {
 262
 263                 blkid_encode_string(value, enc, sizeof(enc));
 264                 printf("ID_%s=%s\n", name, enc);
 265
 266         } else if (!strncmp(name, "PART_ENTRY_", 11))
 267                 printf("ID_%s=%s\n", name, value);
 268
 269         else if (namelen >= 15 && (
 270                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
 271                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
 272                    !strcmp(name, "ALIGNMENT_OFFSET")))
 273                         printf("ID_IOLIMIT_%s=%s\n", name, value);
 274         else
 275                 printf("ID_FS_%s=%s\n", name, value);
 276 }
 277
 278 static int has_item(char *ary[], const char *item)
 279 {
 280         char **p;
 281
 282         for (p = ary; *p != NULL; p++)
 283                 if (!strcmp(item, *p))
 284                         return 1;
 285         return 0;
 286 }
 287
 288 static void print_value(int output, int num, const char *devname,
 289                         const char *value, const char *name, size_t valsz)
 290 {
 291         if (output & OUTPUT_VALUE_ONLY) {
 292                 fputs(value, stdout);
 293                 fputc('\n', stdout);
 294
 295         } else if (output & OUTPUT_UDEV_LIST) {
 296                 print_udev_format(name, value);
 297
 298         } else if (output & OUTPUT_EXPORT_LIST) {
 299                 if (num == 1 && devname)
 300                         printf("DEVNAME=%s\n", devname);
 301                 fputs(name, stdout);
 302                 fputs("=", stdout);
 303                 safe_print(value, valsz);
 304                 fputs("\n", stdout);
 305
 306         } else {
 307                 if (num == 1 && devname)
 308                         printf("%s: ", devname);
 309                 fputs(name, stdout);
 310                 fputs("=\"", stdout);
 311                 safe_print(value, valsz);
 312                 fputs("\" ", stdout);
 313         }
 314 }
 315
 316 static void print_tags(blkid_dev dev, char *show[], int output)
 317 {
 318         blkid_tag_iterate       iter;
 319         const char              *type, *value, *devname;
 320         int                     num = 1;
 321         static int              first = 1;
 322
 323         if (!dev)
 324                 return;
 325
 326         if (output & OUTPUT_PRETTY_LIST) {
 327                 pretty_print_dev(dev);
 328                 return;
 329         }
 330
 331         devname = blkid_dev_devname(dev);
 332
 333         if (output & OUTPUT_DEVICE_ONLY) {
 334                 printf("%s\n", devname);
 335                 return;
 336         }
 337
 338         iter = blkid_tag_iterate_begin(dev);
 339         while (blkid_tag_next(iter, &type, &value) == 0) {
 340                 if (show[0] && !has_item(show, type))
 341                         continue;
 342
 343                 if (num == 1 && !first &&
 344                     (output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 345                         /* add extra line between output from more devices */
 346                         fputc('\n', stdout);
 347
 348                 print_value(output, num++, devname, value, type, strlen(value));
 349         }
 350         blkid_tag_iterate_end(iter);
 351
 352         if (num > 1) {
 353                 if (!(output & (OUTPUT_VALUE_ONLY | OUTPUT_UDEV_LIST |
 354                                                 OUTPUT_EXPORT_LIST)))
 355                         printf("\n");
 356                 first = 0;
 357         }
 358 }
 359
 360
 361 static int append_str(char **res, size_t *sz, const char *a, const char *b)
 362 {
 363         char *str = *res;
 364         size_t asz = a ? strlen(a) : 0;
 365         size_t bsz = b ? strlen(b) : 0;
 366         size_t len = *sz + asz + bsz;
 367
 368         if (!len)
 369                 return -1;
 370
 371         str = realloc(str, len + 1);
 372         if (!str) {
 373                 free(*res);
 374                 *res = NULL;
 375                 return -1;
 376         }
 377
 378         *res = str;
 379         str += *sz;
 380
 381         if (a) {
 382                 memcpy(str, a, asz);
 383                 str += asz;
 384         }
 385         if (b) {
 386                 memcpy(str, b, bsz);
 387                 str += bsz;
 388         }
 389         *str = '\0';
 390         *sz = len;
 391         return 0;
 392 }
 393
 394 /*
 395  * Compose and print ID_FS_AMBIVALENT for udev
 396  */
 397 static int print_udev_ambivalent(blkid_probe pr)
 398 {
 399         char *val = NULL;
 400         size_t valsz = 0;
 401         int count = 0, rc = -1;
 402
 403         while (!blkid_do_probe(pr)) {
 404                 const char *usage_txt = NULL, *type = NULL, *version = NULL;
 405                 char enc[256];
 406
 407                 blkid_probe_lookup_value(pr, "USAGE", &usage_txt, NULL);
 408                 blkid_probe_lookup_value(pr, "TYPE", &type, NULL);
 409                 blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
 410
 411                 if (!usage_txt || !type)
 412                         continue;
 413
 414                 blkid_encode_string(usage_txt, enc, sizeof(enc));
 415                 if (append_str(&val, &valsz, enc, ":"))
 416                         goto done;
 417
 418                 blkid_encode_string(type, enc, sizeof(enc));
 419                 if (append_str(&val, &valsz, enc, version ? ":" : " "))
 420                         goto done;
 421
 422                 if (version) {
 423                         blkid_encode_string(version, enc, sizeof(enc));
 424                         if (append_str(&val, &valsz, enc, " "))
 425                                 goto done;
 426                 }
 427                 count++;
 428         }
 429
 430         if (count > 1) {
 431                 *(val + valsz - 1) = '\0';              /* rem tailing whitespace */
 432                 printf("ID_FS_AMBIVALEN=%s\n", val);
 433                 rc = 0;
 434         }
 435 done:
 436         free(val);
 437         return rc;
 438 }
 439
 440 static int lowprobe_superblocks(blkid_probe pr)
 441 {
 442         struct stat st;
 443         int rc, fd = blkid_probe_get_fd(pr);
 444
 445         if (fd < 0 || fstat(fd, &st))
 446                 return -1;
 447
 448         blkid_probe_enable_partitions(pr, 1);
 449
 450         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
 451             blkid_probe_is_wholedisk(pr)) {
 452                 /*
 453                  * check if the small disk is partitioned, if yes then
 454                  * don't probe for filesystems.
 455                  */
 456                 blkid_probe_enable_superblocks(pr, 0);
 457
 458                 rc = blkid_do_fullprobe(pr);
 459                 if (rc < 0)
 460                         return rc;      /* -1 = error, 1 = nothing, 0 = succes */
 461
 462                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 463                         return 0;       /* partition table detected */
 464         }
 465
 466         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 467         blkid_probe_enable_superblocks(pr, 1);
 468
 469         return blkid_do_safeprobe(pr);
 470 }
 471
 472 static int lowprobe_topology(blkid_probe pr)
 473 {
 474         /* enable topology probing only */
 475         blkid_probe_enable_topology(pr, 1);
 476
 477         blkid_probe_enable_superblocks(pr, 0);
 478         blkid_probe_enable_partitions(pr, 0);
 479
 480         return blkid_do_fullprobe(pr);
 481 }
 482
 483 static int lowprobe_device(blkid_probe pr, const char *devname,
 484                         int chain, char *show[], int output,
 485                         blkid_loff_t offset, blkid_loff_t size)
 486 {
 487         const char *data;
 488         const char *name;
 489         int nvals = 0, n, num = 1;
 490         size_t len;
 491         int fd;
 492         int rc = 0;
 493         static int first = 1;
 494
 495         fd = open(devname, O_RDONLY);
 496         if (fd < 0) {
 497                 fprintf(stderr, "error: %s: %m\n", devname);
 498                 return BLKID_EXIT_NOTFOUND;
 499         }
 500         if (blkid_probe_set_device(pr, fd, offset, size))
 501                 goto done;
 502
 503         if (chain & LOWPROBE_TOPOLOGY)
 504                 rc = lowprobe_topology(pr);
 505         if (rc >= 0 && (chain & LOWPROBE_SUPERBLOCKS))
 506                 rc = lowprobe_superblocks(pr);
 507         if (rc < 0)
 508                 goto done;
 509
 510         if (!rc)
 511                 nvals = blkid_probe_numof_values(pr);
 512
 513         if (nvals &&
 514             !(chain & LOWPROBE_TOPOLOGY) &&
 515             !(output & OUTPUT_UDEV_LIST) &&
 516             !blkid_probe_has_value(pr, "TYPE") &&
 517             !blkid_probe_has_value(pr, "PTTYPE"))
 518                 /*
 519                  * Ignore probing result if there is not any filesystem or
 520                  * partition table on the device and udev output is not
 521                  * requested.
 522                  *
 523                  * The udev db stores information about partitions, so
 524                  * PART_ENTRY_* values are alway important.
 525                  */
 526                 nvals = 0;
 527
 528         if (nvals && !first && output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST))
 529                 /* add extra line between output from devices */
 530                 fputc('\n', stdout);
 531
 532         if (nvals && (output & OUTPUT_DEVICE_ONLY)) {
 533                 printf("%s\n", devname);
 534                 goto done;
 535         }
 536
 537         for (n = 0; n < nvals; n++) {
 538                 if (blkid_probe_get_value(pr, n, &name, &data, &len))
 539                         continue;
 540                 if (show[0] && !has_item(show, name))
 541                         continue;
 542                 len = strnlen((char *) data, len);
 543                 print_value(output, num++, devname, (char *) data, name, len);
 544         }
 545
 546         if (first)
 547                 first = 0;
 548         if (nvals >= 1 && !(output & (OUTPUT_VALUE_ONLY |
 549                                         OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 550                 printf("\n");
 551 done:
 552         if (rc == -2) {
 553                 if (output & OUTPUT_UDEV_LIST)
 554                         print_udev_ambivalent(pr);
 555                 else
 556                         fprintf(stderr,
 557                                 "%s: ambivalent result (probably more "
 558                                 "filesystems on the device, use wipefs(8) "
 559                                 "to see more details)\n",
 560                                 devname);
 561         }
 562         close(fd);
 563
 564         if (rc == -2)
 565                 return BLKID_EXIT_AMBIVAL;      /* ambivalent probing result */
 566         if (!nvals)
 567                 return BLKID_EXIT_NOTFOUND;     /* nothing detected */
 568
 569         return 0;               /* success */
 570 }
 571
 572 /* converts comma separated list to BLKID_USAGE_* mask */
 573 static int list_to_usage(const char *list, int *flag)
 574 {
 575         int mask = 0;
 576         const char *word = NULL, *p = list;
 577
 578         if (p && strncmp(p, "no", 2) == 0) {
 579                 *flag = BLKID_FLTR_NOTIN;
 580                 p += 2;
 581         }
 582         if (!p || !*p)
 583                 goto err;
 584         while(p) {
 585                 word = p;
 586                 p = strchr(p, ',');
 587                 if (p)
 588                         p++;
 589                 if (!strncmp(word, "filesystem", 10))
 590                         mask |= BLKID_USAGE_FILESYSTEM;
 591                 else if (!strncmp(word, "raid", 4))
 592                         mask |= BLKID_USAGE_RAID;
 593                 else if (!strncmp(word, "crypto", 6))
 594                         mask |= BLKID_USAGE_CRYPTO;
 595                 else if (!strncmp(word, "other", 5))
 596                         mask |= BLKID_USAGE_OTHER;
 597                 else
 598                         goto err;
 599         }
 600         return mask;
 601 err:
 602         *flag = 0;
 603         fprintf(stderr, "unknown kerword in -u <list> argument: '%s'\n",
 604                         word ? word : list);
 605         exit(BLKID_EXIT_OTHER);
 606 }
 607
 608 /* converts comma separated list to types[] */
 609 static char **list_to_types(const char *list, int *flag)
 610 {
 611         int i;
 612         const char *p = list;
 613         char **res = NULL;
 614
 615         if (p && strncmp(p, "no", 2) == 0) {
 616                 *flag = BLKID_FLTR_NOTIN;
 617                 p += 2;
 618         }
 619         if (!p || !*p) {
 620                 fprintf(stderr, "error: -u <list> argument is empty\n");
 621                 goto err;
 622         }
 623         for (i = 1; p && (p = strchr(p, ',')); i++, p++);
 624
 625         res = calloc(i + 1, sizeof(char *));
 626         if (!res)
 627                 goto err_mem;
 628         p = *flag & BLKID_FLTR_NOTIN ? list + 2 : list;
 629         i = 0;
 630
 631         while(p) {
 632                 const char *word = p;
 633                 p = strchr(p, ',');
 634                 res[i] = p ? strndup(word, p - word) : strdup(word);
 635                 if (!res[i++])
 636                         goto err_mem;
 637                 if (p)
 638                         p++;
 639         }
 640         res[i] = NULL;
 641         return res;
 642 err_mem:
 643         fprintf(stderr, "out of memory\n");
 644 err:
 645         *flag = 0;
 646         free(res);
 647         exit(BLKID_EXIT_OTHER);
 648 }
 649
 650 static void free_types_list(char *list[])
 651 {
 652         char **n;
 653
 654         if (!list)
 655                 return;
 656         for (n = list; *n; n++)
 657                 free(*n);
 658         free(list);
 659 }
 660
 661 int main(int argc, char **argv)
 662 {
 663         blkid_cache cache = NULL;
 664         char **devices = NULL;
 665         char *show[128] = { NULL, };
 666         char *search_type = NULL, *search_value = NULL;
 667         char *read = NULL;
 668         int fltr_usage = 0;
 669         char **fltr_type = NULL;
 670         int fltr_flag = BLKID_FLTR_ONLYIN;
 671         unsigned int numdev = 0, numtag = 0;
 672         int version = 0;
 673         int err = BLKID_EXIT_OTHER;
 674         unsigned int i;
 675         int output_format = 0;
 676         int lookup = 0, gc = 0, lowprobe = 0, eval = 0;
 677         int c;
 678         uintmax_t offset = 0, size = 0;
 679
 680         static const ul_excl_t excl[] = {       /* rows and cols in in ASCII order */
 681                 { 'n','u' },
 682                 { 0 }
 683         };
 684         int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
 685
 686         show[0] = NULL;
 687         atexit(close_stdout);
 688
 689         while ((c = getopt (argc, argv,
 690                             "c:df:ghilL:n:ko:O:ps:S:t:u:U:w:v")) != EOF) {
 691
 692                 err_exclusive_options(c, NULL, excl, excl_st);
 693
 694                 switch (c) {
 695                 case 'c':
 696                         if (optarg && !*optarg)
 697                                 read = NULL;
 698                         else
 699                                 read = optarg;
 700                         break;
 701                 case 'd':
 702                         raw_chars = 1;
 703                         break;
 704                 case 'L':
 705                         eval++;
 706                         search_value = strdup(optarg);
 707                         search_type = strdup("LABEL");
 708                         break;
 709                 case 'n':
 710                         fltr_type = list_to_types(optarg, &fltr_flag);
 711                         break;
 712                 case 'u':
 713                         fltr_usage = list_to_usage(optarg, &fltr_flag);
 714                         break;
 715                 case 'U':
 716                         eval++;
 717                         search_value = strdup(optarg);
 718                         search_type = strdup("UUID");
 719                         break;
 720                 case 'i':
 721                         lowprobe |= LOWPROBE_TOPOLOGY;
 722                         break;
 723                 case 'l':
 724                         lookup++;
 725                         break;
 726                 case 'g':
 727                         gc = 1;
 728                         break;
 729                 case 'k':
 730                 {
 731                         size_t idx = 0;
 732                         const char *name = NULL;
 733
 734                         while (blkid_superblocks_get_name(idx++, &name, NULL) == 0)
 735                                 printf("%s\n", name);
 736                         exit(EXIT_SUCCESS);
 737                 }
 738                 case 'o':
 739                         if (!strcmp(optarg, "value"))
 740                                 output_format = OUTPUT_VALUE_ONLY;
 741                         else if (!strcmp(optarg, "device"))
 742                                 output_format = OUTPUT_DEVICE_ONLY;
 743                         else if (!strcmp(optarg, "list"))
 744                                 output_format = OUTPUT_PRETTY_LIST;     /* deprecated */
 745                         else if (!strcmp(optarg, "udev"))
 746                                 output_format = OUTPUT_UDEV_LIST;
 747                         else if (!strcmp(optarg, "export"))
 748                                 output_format = OUTPUT_EXPORT_LIST;
 749                         else if (!strcmp(optarg, "full"))
 750                                 output_format = 0;
 751                         else {
 752                                 fprintf(stderr, "Invalid output format %s. "
 753                                         "Choose from value,\n\t"
 754                                         "device, list, udev or full\n", optarg);
 755                                 exit(BLKID_EXIT_OTHER);
 756                         }
 757                         break;
 758                 case 'O':
 759                         offset = strtosize_or_err(optarg, "invalid offset argument");
 760                         break;
 761                 case 'p':
 762                         lowprobe |= LOWPROBE_SUPERBLOCKS;
 763                         break;
 764                 case 's':
 765                         if (numtag + 1 >= sizeof(show) / sizeof(*show)) {
 766                                 fprintf(stderr, "Too many tags specified\n");
 767                                 usage(err);
 768                         }
 769                         show[numtag++] = optarg;
 770                         show[numtag] = NULL;
 771                         break;
 772                 case 'S':
 773                         size = strtosize_or_err(optarg, "invalid size argument");
 774                         break;
 775                 case 't':
 776                         if (search_type) {
 777                                 fprintf(stderr, "Can only search for "
 778                                                 "one NAME=value pair\n");
 779                                 usage(err);
 780                         }
 781                         if (blkid_parse_tag_string(optarg,
 782                                                    &search_type,
 783                                                    &search_value)) {
 784                                 fprintf(stderr, "-t needs NAME=value pair\n");
 785                                 usage(err);
 786                         }
 787                         break;
 788                 case 'v':
 789                         version = 1;
 790                         break;
 791                 case 'w':
 792                         /* ignore - backward compatibility */
 793                         break;
 794                 case 'h':
 795                         err = 0;
 796                         /* fallthrough */
 797                 default:
 798                         usage(err);
 799                 }
 800         }
 801
 802
 803         /* The rest of the args are device names */
 804         if (optind < argc) {
 805                 devices = calloc(argc - optind, sizeof(char *));
 806                 if (!devices) {
 807                         fprintf(stderr, "Failed to allocate device name array\n");
 808                         goto exit;
 809                 }
 810
 811                 while (optind < argc)
 812                         devices[numdev++] = argv[optind++];
 813         }
 814
 815         if (version) {
 816                 print_version(stdout);
 817                 goto exit;
 818         }
 819
 820         /* convert LABEL/UUID lookup to evaluate request */
 821         if (lookup && output_format == OUTPUT_DEVICE_ONLY && search_type &&
 822             (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
 823                 eval++;
 824                 lookup = 0;
 825         }
 826
 827         if (!lowprobe && !eval && blkid_get_cache(&cache, read) < 0)
 828                 goto exit;
 829
 830         if (gc) {
 831                 blkid_gc_cache(cache);
 832                 err = 0;
 833                 goto exit;
 834         }
 835         err = BLKID_EXIT_NOTFOUND;
 836
 837         if (eval == 0 && (output_format & OUTPUT_PRETTY_LIST)) {
 838                 if (lowprobe) {
 839                         fprintf(stderr, "The low-level probing mode does not "
 840                                         "support 'list' output format\n");
 841                         exit(BLKID_EXIT_OTHER);
 842                 }
 843                 pretty_print_dev(NULL);
 844         }
 845
 846         if (lowprobe) {
 847                 /*
 848                  * Low-level API
 849                  */
 850                 blkid_probe pr;
 851
 852                 if (!numdev) {
 853                         fprintf(stderr, "The low-level probing mode "
 854                                         "requires a device\n");
 855                         exit(BLKID_EXIT_OTHER);
 856                 }
 857
 858                 /* automatically enable 'export' format for I/O Limits */
 859                 if (!output_format  && (lowprobe & LOWPROBE_TOPOLOGY))
 860                         output_format = OUTPUT_EXPORT_LIST;
 861
 862                 pr = blkid_new_probe();
 863                 if (!pr)
 864                         goto exit;
 865
 866                 if (lowprobe & LOWPROBE_SUPERBLOCKS) {
 867                         blkid_probe_set_superblocks_flags(pr,
 868                                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 869                                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 870                                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 871
 872                         if (fltr_usage && blkid_probe_filter_superblocks_usage(
 873                                                 pr, fltr_flag, fltr_usage))
 874                                 goto exit;
 875
 876                         else if (fltr_type && blkid_probe_filter_superblocks_type(
 877                                                 pr, fltr_flag, fltr_type))
 878                                 goto exit;
 879                 }
 880
 881                 for (i = 0; i < numdev; i++) {
 882                         err = lowprobe_device(pr, devices[i], lowprobe, show,
 883                                         output_format,
 884                                         (blkid_loff_t) offset,
 885                                         (blkid_loff_t) size);
 886                         if (err)
 887                                 break;
 888                 }
 889                 blkid_free_probe(pr);
 890         } else if (eval) {
 891                 /*
 892                  * Evaluate API
 893                  */
 894                 char *res = blkid_evaluate_tag(search_type, search_value, NULL);
 895                 if (res) {
 896                         err = 0;
 897                         printf("%s\n", res);
 898                 }
 899         } else if (lookup) {
 900                 /*
 901                  * Classic (cache based) API
 902                  */
 903                 blkid_dev dev;
 904
 905                 if (!search_type) {
 906                         fprintf(stderr, "The lookup option requires a "
 907                                 "search type specified using -t\n");
 908                         exit(BLKID_EXIT_OTHER);
 909                 }
 910                 /* Load any additional devices not in the cache */
 911                 for (i = 0; i < numdev; i++)
 912                         blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
 913
 914                 if ((dev = blkid_find_dev_with_tag(cache, search_type,
 915                                                    search_value))) {
 916                         print_tags(dev, show, output_format);
 917                         err = 0;
 918                 }
 919         /* If we didn't specify a single device, show all available devices */
 920         } else if (!numdev) {
 921                 blkid_dev_iterate       iter;
 922                 blkid_dev               dev;
 923
 924                 blkid_probe_all(cache);
 925
 926                 iter = blkid_dev_iterate_begin(cache);
 927                 blkid_dev_set_search(iter, search_type, search_value);
 928                 while (blkid_dev_next(iter, &dev) == 0) {
 929                         dev = blkid_verify(cache, dev);
 930                         if (!dev)
 931                                 continue;
 932                         print_tags(dev, show, output_format);
 933                         err = 0;
 934                 }
 935                 blkid_dev_iterate_end(iter);
 936         /* Add all specified devices to cache (optionally display tags) */
 937         } else for (i = 0; i < numdev; i++) {
 938                 blkid_dev dev = blkid_get_dev(cache, devices[i],
 939                                                   BLKID_DEV_NORMAL);
 940
 941                 if (dev) {
 942                         if (search_type &&
 943                             !blkid_dev_has_tag(dev, search_type,
 944                                                search_value))
 945                                 continue;
 946                         print_tags(dev, show, output_format);
 947                         err = 0;
 948                 }
 949         }
 950
 951 exit:
 952         free(search_type);
 953         free(search_value);
 954         free_types_list(fltr_type);
 955         if (!lowprobe && !eval)
 956                 blkid_put_cache(cache);
 957         free(devices);
 958         return err;
 959 }