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