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