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