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 <termios.h>
  20 #include <errno.h>
  21 #ifdef HAVE_SYS_IOCTL_H
  22 #include <sys/ioctl.h>
  23 #endif
  24 #ifdef HAVE_GETOPT_H
  25 #include <getopt.h>
  26 #else
  27 extern int getopt(int argc, char * const argv[], const char *optstring);
  28 extern char *optarg;
  29 extern int optind;
  30 #endif
  31
  32 #define OUTPUT_VALUE_ONLY       (1 << 1)
  33 #define OUTPUT_DEVICE_ONLY      (1 << 2)
  34 #define OUTPUT_PRETTY_LIST      (1 << 3)
  35 #define OUTPUT_UDEV_LIST        (1 << 4)
  36 #define OUTPUT_EXPORT_LIST      (1 << 5)
  37
  38 #define LOWPROBE_TOPOLOGY       (1 << 1)
  39 #define LOWPROBE_SUPERBLOCKS    (1 << 2)
  40
  41 #include <blkid.h>
  42
  43 #include "ismounted.h"
  44 #include "strutils.h"
  45
  46 const char *progname = "blkid";
  47
  48 int raw_chars;
  49
  50 static void print_version(FILE *out)
  51 {
  52         fprintf(out, "%s from %s (libblkid %s, %s)\n",
  53                 progname, PACKAGE_STRING, LIBBLKID_VERSION, LIBBLKID_DATE);
  54 }
  55
  56 static void usage(int error)
  57 {
  58         FILE *out = error ? stderr : stdout;
  59
  60         print_version(out);
  61         fprintf(out,
  62                 "Usage:\n"
  63                 " %1$s -L <label> | -U <uuid>\n\n"
  64                 " %1$s [-c <file>] [-ghlLv] [-o <format>] [-s <tag>] \n"
  65                 "       [-t <token>] [-w <file>] [<dev> ...]\n\n"
  66                 " %1$s -p [-s <tag>] [-O <offset>] [-S <size>] \n"
  67                 "       [-o <format>] <dev> ...\n\n"
  68                 " %1$s -i [-s <tag>] [-o <format>] <dev> ...\n\n"
  69                 "Options:\n"
  70                 " -c <file>   cache file (default: /etc/blkid.tab, /dev/null = none)\n"
  71                 " -d          don't encode non-printing characters\n"
  72                 " -h          print this usage message and exit\n"
  73                 " -g          garbage collect the blkid cache\n"
  74                 " -o <format> output format; can be one of:\n"
  75                 "               value, device, list, udev, export or full; (default: full)\n"
  76                 " -k          list all known filesystems/RAIDs and exit\n"
  77                 " -s <tag>    show specified tag(s) (default show all tags)\n"
  78                 " -t <token>  find device with a specific token (NAME=value pair)\n"
  79                 " -l          look up only first device with token specified by -t\n"
  80                 " -L <label>  convert LABEL to device name\n"
  81                 " -U <uuid>   convert UUID to device name\n"
  82                 " -v          print version and exit\n"
  83                 " -w <file>   write cache to different file (/dev/null = no write)\n"
  84                 " <dev>       specify device(s) to probe (default: all devices)\n\n"
  85                 "Low-level probing options:\n"
  86                 " -p          low-level superblocks probing (bypass cache)\n"
  87                 " -i          gather information about I/O limits\n"
  88                 " -S <size>   overwrite device size\n"
  89                 " -O <offset> probe at the given offset\n"
  90                 " -u <list>   filter by \"usage\" (e.g. -u filesystem,raid)\n"
  91                 " -n <list>   filter by filesystem type (e.g. -n vfat,ext3)\n"
  92                 "\n", progname);
  93
  94         exit(error);
  95 }
  96
  97 /*
  98  * This function does "safe" printing.  It will convert non-printable
  99  * ASCII characters using '^' and M- notation.
 100  */
 101 static void safe_print(const char *cp, int len)
 102 {
 103         unsigned char   ch;
 104
 105         if (len < 0)
 106                 len = strlen(cp);
 107
 108         while (len--) {
 109                 ch = *cp++;
 110                 if (!raw_chars) {
 111                         if (ch >= 128) {
 112                                 fputs("M-", stdout);
 113                                 ch -= 128;
 114                         }
 115                         if ((ch < 32) || (ch == 0x7f)) {
 116                                 fputc('^', stdout);
 117                                 ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
 118                         }
 119                 }
 120                 fputc(ch, stdout);
 121         }
 122 }
 123
 124 static int get_terminal_width(void)
 125 {
 126 #ifdef TIOCGSIZE
 127         struct ttysize  t_win;
 128 #endif
 129 #ifdef TIOCGWINSZ
 130         struct winsize  w_win;
 131 #endif
 132         const char      *cp;
 133
 134 #ifdef TIOCGSIZE
 135         if (ioctl (0, TIOCGSIZE, &t_win) == 0)
 136                 return (t_win.ts_cols);
 137 #endif
 138 #ifdef TIOCGWINSZ
 139         if (ioctl (0, TIOCGWINSZ, &w_win) == 0)
 140                 return (w_win.ws_col);
 141 #endif
 142         cp = getenv("COLUMNS");
 143         if (cp)
 144                 return strtol(cp, NULL, 10);
 145         return 80;
 146 }
 147
 148 static int pretty_print_word(const char *str, int max_len,
 149                              int left_len, int overflow_nl)
 150 {
 151         int len = strlen(str) + left_len;
 152         int ret = 0;
 153
 154         fputs(str, stdout);
 155         if (overflow_nl && len > max_len) {
 156                 fputc('\n', stdout);
 157                 len = 0;
 158         } else if (len > max_len)
 159                 ret = len - max_len;
 160         do
 161                 fputc(' ', stdout);
 162         while (len++ < max_len);
 163         return ret;
 164 }
 165
 166 static void pretty_print_line(const char *device, const char *fs_type,
 167                               const char *label, const char *mtpt,
 168                               const char *uuid)
 169 {
 170         static int device_len = 10, fs_type_len = 7;
 171         static int label_len = 8, mtpt_len = 14;
 172         static int term_width = -1;
 173         int len, w;
 174
 175         if (term_width < 0)
 176                 term_width = get_terminal_width();
 177
 178         if (term_width > 80) {
 179                 term_width -= 80;
 180                 w = term_width / 10;
 181                 if (w > 8)
 182                         w = 8;
 183                 term_width -= 2*w;
 184                 label_len += w;
 185                 fs_type_len += w;
 186                 w = term_width/2;
 187                 device_len += w;
 188                 mtpt_len +=w;
 189         }
 190
 191         len = pretty_print_word(device, device_len, 0, 1);
 192         len = pretty_print_word(fs_type, fs_type_len, len, 0);
 193         len = pretty_print_word(label, label_len, len, 0);
 194         len = pretty_print_word(mtpt, mtpt_len, len, 0);
 195         fputs(uuid, stdout);
 196         fputc('\n', stdout);
 197 }
 198
 199 static void pretty_print_dev(blkid_dev dev)
 200 {
 201         blkid_tag_iterate       iter;
 202         const char              *type, *value, *devname;
 203         const char              *uuid = "", *fs_type = "", *label = "";
 204         int                     len, mount_flags;
 205         char                    mtpt[80];
 206         int                     retval;
 207
 208         if (dev == NULL) {
 209                 pretty_print_line("device", "fs_type", "label",
 210                                   "mount point", "UUID");
 211                 for (len=get_terminal_width()-1; len > 0; len--)
 212                         fputc('-', stdout);
 213                 fputc('\n', stdout);
 214                 return;
 215         }
 216
 217         devname = blkid_dev_devname(dev);
 218         if (access(devname, F_OK))
 219                 return;
 220
 221         /* Get the uuid, label, type */
 222         iter = blkid_tag_iterate_begin(dev);
 223         while (blkid_tag_next(iter, &type, &value) == 0) {
 224                 if (!strcmp(type, "UUID"))
 225                         uuid = value;
 226                 if (!strcmp(type, "TYPE"))
 227                         fs_type = value;
 228                 if (!strcmp(type, "LABEL"))
 229                         label = value;
 230         }
 231         blkid_tag_iterate_end(iter);
 232
 233         /* Get the mount point */
 234         mtpt[0] = 0;
 235         retval = check_mount_point(devname, &mount_flags, mtpt, sizeof(mtpt));
 236         if (retval == 0) {
 237                 if (mount_flags & MF_MOUNTED) {
 238                         if (!mtpt[0])
 239                                 strcpy(mtpt, "(mounted, mtpt unknown)");
 240                 } else if (mount_flags & MF_BUSY)
 241                         strcpy(mtpt, "(in use)");
 242                 else
 243                         strcpy(mtpt, "(not mounted)");
 244         }
 245
 246         pretty_print_line(devname, fs_type, label, mtpt, uuid);
 247 }
 248
 249 static void print_udev_format(const char *name, const char *value)
 250 {
 251         char enc[265], safe[256];
 252         size_t namelen = strlen(name);
 253
 254         *safe = *enc = '\0';
 255
 256         if (!strcmp(name, "TYPE") || !strcmp(name, "VERSION")) {
 257                 blkid_encode_string(value, enc, sizeof(enc));
 258                 printf("ID_FS_%s=%s\n", name, enc);
 259
 260         } else if (!strcmp(name, "UUID") ||
 261                  !strcmp(name, "LABEL") ||
 262                  !strcmp(name, "UUID_SUB")) {
 263
 264                 blkid_safe_string(value, safe, sizeof(safe));
 265                 printf("ID_FS_%s=%s\n", name, safe);
 266
 267                 blkid_encode_string(value, enc, sizeof(enc));
 268                 printf("ID_FS_%s_ENC=%s\n", name, enc);
 269
 270         } else if (!strcmp(name, "PTTYPE")) {
 271                 printf("ID_PART_TABLE_TYPE=%s\n", value);
 272
 273         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
 274                   !strcmp(name, "PART_ENTRY_TYPE")) {
 275
 276                 blkid_encode_string(value, enc, sizeof(enc));
 277                 printf("ID_%s=%s\n", name, enc);
 278
 279         } else if (!strncmp(name, "PART_ENTRY_", 11))
 280                 printf("ID_%s=%s\n", name, value);
 281
 282         else if (namelen >= 15 && (
 283                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
 284                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
 285                    !strcmp(name, "ALIGNMENT_OFFSET")))
 286                         printf("ID_IOLIMIT_%s=%s\n", name, value);
 287         else
 288                 printf("ID_FS_%s=%s\n", name, value);
 289 }
 290
 291 static int has_item(char *ary[], const char *item)
 292 {
 293         char **p;
 294
 295         for (p = ary; *p != NULL; p++)
 296                 if (!strcmp(item, *p))
 297                         return 1;
 298         return 0;
 299 }
 300
 301 static void print_value(int output, int num, const char *devname,
 302                         const char *value, const char *name, size_t valsz)
 303 {
 304         if (output & OUTPUT_VALUE_ONLY) {
 305                 fputs(value, stdout);
 306                 fputc('\n', stdout);
 307
 308         } else if (output & OUTPUT_UDEV_LIST) {
 309                 print_udev_format(name, value);
 310
 311         } else if (output & OUTPUT_EXPORT_LIST) {
 312                 fputs(name, stdout);
 313                 fputs("=", stdout);
 314                 safe_print(value, valsz);
 315                 fputs("\n", stdout);
 316
 317         } else {
 318                 if (num == 1 && devname)
 319                         printf("%s: ", devname);
 320                 fputs(name, stdout);
 321                 fputs("=\"", stdout);
 322                 safe_print(value, valsz);
 323                 fputs("\" ", stdout);
 324         }
 325 }
 326
 327 static void print_tags(blkid_dev dev, char *show[], int output)
 328 {
 329         blkid_tag_iterate       iter;
 330         const char              *type, *value, *devname;
 331         int                     num = 1;
 332         static int              first = 1;
 333
 334         if (!dev)
 335                 return;
 336
 337         if (output & OUTPUT_PRETTY_LIST) {
 338                 pretty_print_dev(dev);
 339                 return;
 340         }
 341
 342         devname = blkid_dev_devname(dev);
 343
 344         if (output & OUTPUT_DEVICE_ONLY) {
 345                 printf("%s\n", devname);
 346                 return;
 347         }
 348
 349         iter = blkid_tag_iterate_begin(dev);
 350         while (blkid_tag_next(iter, &type, &value) == 0) {
 351                 if (show[0] && !has_item(show, type))
 352                         continue;
 353
 354                 if (num == 1 && !first &&
 355                     (output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 356                         /* add extra line between output from more devices */
 357                         fputc('\n', stdout);
 358
 359                 print_value(output, num++, devname, value, type, strlen(value));
 360         }
 361         blkid_tag_iterate_end(iter);
 362
 363         if (num > 1) {
 364                 if (!(output & (OUTPUT_VALUE_ONLY | OUTPUT_UDEV_LIST |
 365                                                 OUTPUT_EXPORT_LIST)))
 366                         printf("\n");
 367                 first = 0;
 368         }
 369 }
 370
 371
 372 static int append_str(char **res, size_t *sz, const char *a, const char *b)
 373 {
 374         char *str = *res;
 375         size_t asz = a ? strlen(a) : 0;
 376         size_t bsz = b ? strlen(b) : 0;
 377         size_t len = *sz + asz + bsz;
 378
 379         if (!len)
 380                 return -1;
 381
 382         str = realloc(str, len + 1);
 383         if (!str)
 384                 return -1;
 385
 386         *res = str;
 387         str += *sz;
 388
 389         if (a) {
 390                 memcpy(str, a, asz);
 391                 str += asz;
 392         }
 393         if (b) {
 394                 memcpy(str, b, bsz);
 395                 str += bsz;
 396         }
 397         *str = '\0';
 398         *sz = len;
 399         return 0;
 400 }
 401
 402 /*
 403  * Compose and print ID_FS_AMBIVALENT for udev
 404  */
 405 static int print_udev_ambivalent(blkid_probe pr)
 406 {
 407         char *val = NULL;
 408         size_t valsz = 0;
 409         int count = 0, rc = -1;
 410
 411         while (!blkid_do_probe(pr)) {
 412                 const char *usage = NULL, *type = NULL, *version = NULL;
 413                 char enc[256];
 414
 415                 blkid_probe_lookup_value(pr, "USAGE", &usage, NULL);
 416                 blkid_probe_lookup_value(pr, "TYPE", &type, NULL);
 417                 blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
 418
 419                 if (!usage || !type)
 420                         continue;
 421
 422                 blkid_encode_string(usage, enc, sizeof(enc));
 423                 if (append_str(&val, &valsz, enc, ":"))
 424                         goto done;
 425
 426                 blkid_encode_string(type, enc, sizeof(enc));
 427                 if (append_str(&val, &valsz, enc, version ? ":" : " "))
 428                         goto done;
 429
 430                 if (version) {
 431                         blkid_encode_string(version, enc, sizeof(enc));
 432                         if (append_str(&val, &valsz, enc, " "))
 433                                 goto done;
 434                 }
 435                 count++;
 436         }
 437
 438         if (count > 1) {
 439                 *(val + valsz - 1) = '\0';              /* rem tailing whitespace */
 440                 printf("ID_FS_AMBIVALEN=%s\n", val);
 441                 rc = 0;
 442         }
 443 done:
 444         free(val);
 445         return rc;
 446 }
 447
 448 static int lowprobe_superblocks(blkid_probe pr)
 449 {
 450         struct stat st;
 451         int rc;
 452
 453         if (fstat(blkid_probe_get_fd(pr), &st))
 454                 return -1;
 455
 456         blkid_probe_enable_partitions(pr, 1);
 457         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 458
 459         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440) {
 460                 /*
 461                  * check if the small disk is partitioned, if yes then
 462                  * don't probe for filesystems.
 463                  */
 464                 blkid_probe_enable_superblocks(pr, 0);
 465
 466                 rc = blkid_do_fullprobe(pr);
 467                 if (rc < 0)
 468                         return rc;      /* -1 = error, 1 = nothing, 0 = succes */
 469
 470                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 471                         return 0;       /* partition table detected */
 472
 473                 /* small whole-disk is unpartitioned, probe for filesystems only */
 474                 blkid_probe_enable_partitions(pr, 0);
 475         }
 476
 477         blkid_probe_enable_superblocks(pr, 1);
 478
 479         return blkid_do_safeprobe(pr);
 480 }
 481
 482 static int lowprobe_topology(blkid_probe pr)
 483 {
 484         /* enable topology probing only */
 485         blkid_probe_enable_topology(pr, 1);
 486
 487         blkid_probe_enable_superblocks(pr, 0);
 488         blkid_probe_enable_partitions(pr, 0);
 489
 490         return blkid_do_fullprobe(pr);
 491 }
 492
 493 static int lowprobe_device(blkid_probe pr, const char *devname,
 494                         int chain, char *show[], int output,
 495                         blkid_loff_t offset, blkid_loff_t size)
 496 {
 497         const char *data;
 498         const char *name;
 499         int nvals = 0, n, num = 1;
 500         size_t len;
 501         int fd;
 502         int rc = 0;
 503         static int first = 1;
 504
 505         fd = open(devname, O_RDONLY);
 506         if (fd < 0) {
 507                 fprintf(stderr, "error: %s: %m\n", devname);
 508                 return 2;
 509         }
 510         if (blkid_probe_set_device(pr, fd, offset, size))
 511                 goto done;
 512
 513         if (chain & LOWPROBE_TOPOLOGY)
 514                 rc = lowprobe_topology(pr);
 515         if (rc >= 0 && (chain & LOWPROBE_SUPERBLOCKS))
 516                 rc = lowprobe_superblocks(pr);
 517         if (rc < 0)
 518                 goto done;
 519
 520         if (!rc)
 521                 nvals = blkid_probe_numof_values(pr);
 522
 523         if (nvals &&
 524             !(chain & LOWPROBE_TOPOLOGY) &&
 525             !(output & OUTPUT_UDEV_LIST) &&
 526             !blkid_probe_has_value(pr, "TYPE") &&
 527             !blkid_probe_has_value(pr, "PTTYPE"))
 528                 /*
 529                  * Ignore probing result if there is not any filesystem or
 530                  * partition table on the device and udev output is not
 531                  * requested.
 532                  *
 533                  * The udev db stores information about partitions, so
 534                  * PART_ENTRY_* values are alway important.
 535                  */
 536                 nvals = 0;
 537
 538         if (nvals && !first && output & (OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST))
 539                 /* add extra line between output from devices */
 540                 fputc('\n', stdout);
 541
 542         if (nvals && (output & OUTPUT_DEVICE_ONLY)) {
 543                 printf("%s\n", devname);
 544                 goto done;
 545         }
 546
 547         for (n = 0; n < nvals; n++) {
 548                 if (blkid_probe_get_value(pr, n, &name, &data, &len))
 549                         continue;
 550                 if (show[0] && !has_item(show, name))
 551                         continue;
 552                 len = strnlen((char *) data, len);
 553                 print_value(output, num++, devname, (char *) data, name, len);
 554         }
 555
 556         if (first)
 557                 first = 0;
 558         if (nvals >= 1 && !(output & (OUTPUT_VALUE_ONLY |
 559                                         OUTPUT_UDEV_LIST | OUTPUT_EXPORT_LIST)))
 560                 printf("\n");
 561 done:
 562         if (rc == -2) {
 563                 if (output & OUTPUT_UDEV_LIST)
 564                         print_udev_ambivalent(pr);
 565                 else
 566                         fprintf(stderr,
 567                                 "%s: ambivalent result (probably more "
 568                                 "filesystems on the device, use wipefs(8) "
 569                                 "to see more details)\n",
 570                                 devname);
 571         }
 572         close(fd);
 573
 574         if (rc == -2)
 575                 return 8;       /* ambivalent probing result */
 576         if (!nvals)
 577                 return 2;       /* nothing detected */
 578
 579         return 0;               /* sucess */
 580 }
 581
 582 /* converts comma separated list to BLKID_USAGE_* mask */
 583 static int list_to_usage(const char *list, int *flag)
 584 {
 585         int mask = 0;
 586         const char *word = NULL, *p = list;
 587
 588         if (p && strncmp(p, "no", 2) == 0) {
 589                 *flag = BLKID_FLTR_NOTIN;
 590                 p += 2;
 591         }
 592         if (!p || !*p)
 593                 goto err;
 594         while(p) {
 595                 word = p;
 596                 p = strchr(p, ',');
 597                 if (p)
 598                         p++;
 599                 if (!strncmp(word, "filesystem", 10))
 600                         mask |= BLKID_USAGE_FILESYSTEM;
 601                 else if (!strncmp(word, "raid", 4))
 602                         mask |= BLKID_USAGE_RAID;
 603                 else if (!strncmp(word, "crypto", 6))
 604                         mask |= BLKID_USAGE_CRYPTO;
 605                 else if (!strncmp(word, "other", 5))
 606                         mask |= BLKID_USAGE_OTHER;
 607                 else
 608                         goto err;
 609         }
 610         return mask;
 611 err:
 612         *flag = 0;
 613         fprintf(stderr, "unknown kerword in -u <list> argument: '%s'\n",
 614                         word ? word : list);
 615         exit(4);
 616 }
 617
 618 /* converts comma separated list to types[] */
 619 static char **list_to_types(const char *list, int *flag)
 620 {
 621         int i;
 622         const char *p = list;
 623         char **res = NULL;
 624
 625         if (p && strncmp(p, "no", 2) == 0) {
 626                 *flag = BLKID_FLTR_NOTIN;
 627                 p += 2;
 628         }
 629         if (!p || !*p) {
 630                 fprintf(stderr, "error: -u <list> argument is empty\n");
 631                 goto err;
 632         }
 633         for (i = 1; p && (p = strchr(p, ',')); i++, p++);
 634
 635         res = calloc(i + 1, sizeof(char *));
 636         if (!res)
 637                 goto err_mem;
 638         p = *flag & BLKID_FLTR_NOTIN ? list + 2 : list;
 639         i = 0;
 640
 641         while(p) {
 642                 const char *word = p;
 643                 p = strchr(p, ',');
 644                 res[i] = p ? strndup(word, p - word) : strdup(word);
 645                 if (!res[i++])
 646                         goto err_mem;
 647                 if (p)
 648                         p++;
 649         }
 650         res[i] = NULL;
 651         return res;
 652 err_mem:
 653         fprintf(stderr, "out of memory\n");
 654 err:
 655         *flag = 0;
 656         free(res);
 657         exit(4);
 658 }
 659
 660 static void free_types_list(char *list[])
 661 {
 662         char **n;
 663
 664         if (!list)
 665                 return;
 666         for (n = list; *n; n++)
 667                 free(*n);
 668         free(list);
 669 }
 670
 671 int main(int argc, char **argv)
 672 {
 673         blkid_cache cache = NULL;
 674         char **devices = NULL;
 675         char *show[128] = { NULL, };
 676         char *search_type = NULL, *search_value = NULL;
 677         char *read = NULL;
 678         char *write = NULL;
 679         int fltr_usage = 0;
 680         char **fltr_type = NULL;
 681         int fltr_flag = BLKID_FLTR_ONLYIN;
 682         unsigned int numdev = 0, numtag = 0;
 683         int version = 0;
 684         int err = 4;
 685         unsigned int i;
 686         int output_format = 0;
 687         int lookup = 0, gc = 0, lowprobe = 0, eval = 0;
 688         int c;
 689         uintmax_t offset = 0, size = 0;
 690
 691         show[0] = NULL;
 692
 693         while ((c = getopt (argc, argv, "c:df:ghilL:n:ko:O:ps:S:t:u:U:w:v")) != EOF)
 694                 switch (c) {
 695                 case 'c':
 696                         if (optarg && !*optarg)
 697                                 read = NULL;
 698                         else
 699                                 read = optarg;
 700                         if (!write)
 701                                 write = read;
 702                         break;
 703                 case 'd':
 704                         raw_chars = 1;
 705                         break;
 706                 case 'L':
 707                         eval++;
 708                         search_value = strdup(optarg);
 709                         search_type = strdup("LABEL");
 710                         break;
 711                 case 'n':
 712                         if (fltr_usage) {
 713                                 fprintf(stderr, "error: -u and -n options are mutually exclusive\n");
 714                                 exit(4);
 715                         }
 716                         fltr_type = list_to_types(optarg, &fltr_flag);
 717                         break;
 718                 case 'u':
 719                         if (fltr_type) {
 720                                 fprintf(stderr, "error: -u and -n options are mutually exclusive\n");
 721                                 exit(4);
 722                         }
 723                         fltr_usage = list_to_usage(optarg, &fltr_flag);
 724                         break;
 725                 case 'U':
 726                         eval++;
 727                         search_value = strdup(optarg);
 728                         search_type = strdup("UUID");
 729                         break;
 730                 case 'i':
 731                         lowprobe |= LOWPROBE_TOPOLOGY;
 732                         break;
 733                 case 'l':
 734                         lookup++;
 735                         break;
 736                 case 'g':
 737                         gc = 1;
 738                         break;
 739                 case 'k':
 740                 {
 741                         size_t idx = 0;
 742                         const char *name = NULL;
 743
 744                         while (blkid_superblocks_get_name(idx++, &name, NULL) == 0)
 745                                 printf("%s\n", name);
 746                         exit(0);
 747                 }
 748                 case 'o':
 749                         if (!strcmp(optarg, "value"))
 750                                 output_format = OUTPUT_VALUE_ONLY;
 751                         else if (!strcmp(optarg, "device"))
 752                                 output_format = OUTPUT_DEVICE_ONLY;
 753                         else if (!strcmp(optarg, "list"))
 754                                 output_format = OUTPUT_PRETTY_LIST;
 755                         else if (!strcmp(optarg, "udev"))
 756                                 output_format = OUTPUT_UDEV_LIST;
 757                         else if (!strcmp(optarg, "export"))
 758                                 output_format = OUTPUT_EXPORT_LIST;
 759                         else if (!strcmp(optarg, "full"))
 760                                 output_format = 0;
 761                         else {
 762                                 fprintf(stderr, "Invalid output format %s. "
 763                                         "Choose from value,\n\t"
 764                                         "device, list, udev or full\n", optarg);
 765                                 exit(4);
 766                         }
 767                         break;
 768                 case 'O':
 769                         if (strtosize(optarg, &offset))
 770                                 fprintf(stderr,
 771                                         "Invalid offset '%s' specified\n",
 772                                         optarg);
 773                         break;
 774                 case 'p':
 775                         lowprobe |= LOWPROBE_SUPERBLOCKS;
 776                         break;
 777                 case 's':
 778                         if (numtag + 1 >= sizeof(show) / sizeof(*show)) {
 779                                 fprintf(stderr, "Too many tags specified\n");
 780                                 usage(err);
 781                         }
 782                         show[numtag++] = optarg;
 783                         show[numtag] = NULL;
 784                         break;
 785                 case 'S':
 786                         if (strtosize(optarg, &size))
 787                                 fprintf(stderr,
 788                                         "Invalid size '%s' specified\n",
 789                                         optarg);
 790                         break;
 791                 case 't':
 792                         if (search_type) {
 793                                 fprintf(stderr, "Can only search for "
 794                                                 "one NAME=value pair\n");
 795                                 usage(err);
 796                         }
 797                         if (blkid_parse_tag_string(optarg,
 798                                                    &search_type,
 799                                                    &search_value)) {
 800                                 fprintf(stderr, "-t needs NAME=value pair\n");
 801                                 usage(err);
 802                         }
 803                         break;
 804                 case 'v':
 805                         version = 1;
 806                         break;
 807                 case 'w':
 808                         if (optarg && !*optarg)
 809                                 write = NULL;
 810                         else
 811                                 write = optarg;
 812                         break;
 813                 case 'h':
 814                         err = 0;
 815                 default:
 816                         usage(err);
 817                 }
 818
 819
 820         /* The rest of the args are device names */
 821         if (optind < argc) {
 822                 devices = calloc(argc - optind, sizeof(char *));
 823                 if (!devices) {
 824                         fprintf(stderr, "Failed to allocate device name array\n");
 825                         goto exit;
 826                 }
 827
 828                 while (optind < argc)
 829                         devices[numdev++] = argv[optind++];
 830         }
 831
 832         if (version) {
 833                 print_version(stdout);
 834                 goto exit;
 835         }
 836
 837         /* convert LABEL/UUID lookup to evaluate request */
 838         if (lookup && output_format == OUTPUT_DEVICE_ONLY && search_type &&
 839             (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
 840                 eval++;
 841                 lookup = 0;
 842         }
 843
 844         if (!lowprobe && !eval && blkid_get_cache(&cache, read) < 0)
 845                 goto exit;
 846
 847         if (gc) {
 848                 blkid_gc_cache(cache);
 849                 err = 0;
 850                 goto exit;
 851         }
 852         err = 2;
 853
 854         if (eval == 0 && (output_format & OUTPUT_PRETTY_LIST)) {
 855                 if (lowprobe) {
 856                         fprintf(stderr, "The low-level probing mode does not "
 857                                         "support 'list' output format\n");
 858                         exit(4);
 859                 }
 860                 pretty_print_dev(NULL);
 861         }
 862
 863         if (lowprobe) {
 864                 /*
 865                  * Low-level API
 866                  */
 867                 blkid_probe pr;
 868
 869                 if (!numdev) {
 870                         fprintf(stderr, "The low-level probing mode "
 871                                         "requires a device\n");
 872                         exit(4);
 873                 }
 874
 875                 /* automatically enable 'export' format for I/O Limits */
 876                 if (!output_format  && (lowprobe & LOWPROBE_TOPOLOGY))
 877                         output_format = OUTPUT_EXPORT_LIST;
 878
 879                 pr = blkid_new_probe();
 880                 if (!pr)
 881                         goto exit;
 882
 883                 if (lowprobe & LOWPROBE_SUPERBLOCKS) {
 884                         blkid_probe_set_superblocks_flags(pr,
 885                                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 886                                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 887                                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 888
 889                         if (fltr_usage && blkid_probe_filter_superblocks_usage(
 890                                                 pr, fltr_flag, fltr_usage))
 891                                 goto exit;
 892
 893                         else if (fltr_type && blkid_probe_filter_superblocks_type(
 894                                                 pr, fltr_flag, fltr_type))
 895                                 goto exit;
 896                 }
 897
 898                 for (i = 0; i < numdev; i++)
 899                         err = lowprobe_device(pr, devices[i], lowprobe, show,
 900                                         output_format,
 901                                         (blkid_loff_t) offset,
 902                                         (blkid_loff_t) size);
 903                 blkid_free_probe(pr);
 904         } else if (eval) {
 905                 /*
 906                  * Evaluate API
 907                  */
 908                 char *res = blkid_evaluate_tag(search_type, search_value, NULL);
 909                 if (res) {
 910                         err = 0;
 911                         printf("%s\n", res);
 912                 }
 913         } else if (lookup) {
 914                 /*
 915                  * Classic (cache based) API
 916                  */
 917                 blkid_dev dev;
 918
 919                 if (!search_type) {
 920                         fprintf(stderr, "The lookup option requires a "
 921                                 "search type specified using -t\n");
 922                         exit(4);
 923                 }
 924                 /* Load any additional devices not in the cache */
 925                 for (i = 0; i < numdev; i++)
 926                         blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL);
 927
 928                 if ((dev = blkid_find_dev_with_tag(cache, search_type,
 929                                                    search_value))) {
 930                         print_tags(dev, show, output_format);
 931                         err = 0;
 932                 }
 933         /* If we didn't specify a single device, show all available devices */
 934         } else if (!numdev) {
 935                 blkid_dev_iterate       iter;
 936                 blkid_dev               dev;
 937
 938                 blkid_probe_all(cache);
 939
 940                 iter = blkid_dev_iterate_begin(cache);
 941                 blkid_dev_set_search(iter, search_type, search_value);
 942                 while (blkid_dev_next(iter, &dev) == 0) {
 943                         dev = blkid_verify(cache, dev);
 944                         if (!dev)
 945                                 continue;
 946                         print_tags(dev, show, output_format);
 947                         err = 0;
 948                 }
 949                 blkid_dev_iterate_end(iter);
 950         /* Add all specified devices to cache (optionally display tags) */
 951         } else for (i = 0; i < numdev; i++) {
 952                 blkid_dev dev = blkid_get_dev(cache, devices[i],
 953                                                   BLKID_DEV_NORMAL);
 954
 955                 if (dev) {
 956                         if (search_type &&
 957                             !blkid_dev_has_tag(dev, search_type,
 958                                                search_value))
 959                                 continue;
 960                         print_tags(dev, show, output_format);
 961                         err = 0;
 962                 }
 963         }
 964
 965 exit:
 966         free(search_type);
 967         free(search_value);
 968         free_types_list(fltr_type);
 969         if (!lowprobe && !eval)
 970                 blkid_put_cache(cache);
 971         free(devices);
 972         return err;
 973 }