disk-utils/fdisk.c

   1 /*
   2  * Copyright (C) 1992  A. V. Le Blanc (LeBlanc@mcc.ac.uk)
   3  * Copyright (C) 2012  Davidlohr Bueso <dave@gnu.org>
   4  *
   5  * Copyright (C) 2007-2013 Karel Zak <kzak@redhat.com>
   6  *
   7  * This program is free software.  You can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation: either version 1 or
  10  * (at your option) any later version.
  11  */
  12 #include <unistd.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <fcntl.h>
  17 #include <ctype.h>
  18 #include <errno.h>
  19 #include <getopt.h>
  20 #include <sys/stat.h>
  21 #include <sys/time.h>
  22 #include <time.h>
  23 #include <limits.h>
  24 #include <signal.h>
  25 #include <poll.h>
  26 #include <libsmartcols.h>
  27 #ifdef HAVE_LIBREADLINE
  28 # define _FUNCTION_DEF
  29 # include <readline/readline.h>
  30 #endif
  31
  32 #include "c.h"
  33 #include "xalloc.h"
  34 #include "all-io.h"
  35 #include "nls.h"
  36 #include "rpmatch.h"
  37 #include "blkdev.h"
  38 #include "mbsalign.h"
  39 #include "pathnames.h"
  40 #include "canonicalize.h"
  41 #include "strutils.h"
  42 #include "closestream.h"
  43 #include "pager.h"
  44
  45 #include "fdisk.h"
  46
  47 #include "pt-sun.h"             /* to toggle flags */
  48
  49 #ifdef HAVE_LINUX_COMPILER_H
  50 # include <linux/compiler.h>
  51 #endif
  52 #ifdef HAVE_LINUX_BLKPG_H
  53 # include <linux/blkpg.h>
  54 #endif
  55
  56 int pwipemode = WIPEMODE_AUTO;
  57 int device_is_used;
  58 int is_interactive;
  59 struct fdisk_table *original_layout;
  60
  61 static int wipemode = WIPEMODE_AUTO;
  62
  63 /*
  64  * fdisk debug stuff (see fdisk.h and include/debug.h)
  65  */
  66 UL_DEBUG_DEFINE_MASK(fdisk);
  67 UL_DEBUG_DEFINE_MASKNAMES(fdisk) = UL_DEBUG_EMPTY_MASKNAMES;
  68
  69 static void fdiskprog_init_debug(void)
  70 {
  71         __UL_INIT_DEBUG_FROM_ENV(fdisk, FDISKPROG_DEBUG_, 0, FDISK_DEBUG);
  72 }
  73
  74 static void reply_sighandler(int sig __attribute__((unused)))
  75 {
  76         DBG(ASK, ul_debug("got signal"));
  77 }
  78
  79 static int reply_running;
  80
  81 #ifdef HAVE_LIBREADLINE
  82 static char *reply_line;
  83
  84 static void reply_linehandler(char *line)
  85 {
  86         reply_line = line;
  87         reply_running = 0;
  88         rl_callback_handler_remove();   /* avoid duplicate prompt */
  89 }
  90 #endif
  91
  92 int get_user_reply(const char *prompt, char *buf, size_t bufsz)
  93 {
  94         struct sigaction oldact, act = {
  95                 .sa_handler = reply_sighandler
  96         };
  97         struct pollfd fds[] = {
  98                 { .fd = fileno(stdin), .events = POLLIN }
  99         };
 100         size_t sz;
 101         int ret = 0;
 102
 103         DBG(ASK, ul_debug("asking for user reply %s", is_interactive ? "[interactive]" : ""));
 104
 105         sigemptyset(&act.sa_mask);
 106         sigaction(SIGINT, &act, &oldact);
 107
 108 #ifdef HAVE_LIBREADLINE
 109         if (is_interactive)
 110                 rl_callback_handler_install(prompt, reply_linehandler);
 111 #endif
 112         errno = 0;
 113         reply_running = 1;
 114         do {
 115                 int rc;
 116
 117                 *buf = '\0';
 118 #ifdef HAVE_LIBREADLINE
 119                 if (!is_interactive)
 120 #endif
 121                 {
 122                         fputs(prompt, stdout);
 123                         fflush(stdout);
 124                 }
 125
 126                 rc = poll(fds, 1, -1);
 127                 if (rc == -1 && errno == EINTR) {       /* interrupted by signal */
 128                         DBG(ASK, ul_debug("cancel by CTRL+C"));
 129                         ret = -ECANCELED;
 130                         goto done;
 131                 }
 132                 if (rc == -1 && errno != EAGAIN) {      /* error */
 133                         ret = -errno;
 134                         goto done;
 135                 }
 136 #ifdef HAVE_LIBREADLINE
 137                 if (is_interactive) {
 138                         /* read input and copy to buf[] */
 139                         rl_callback_read_char();
 140                         if (!reply_running && reply_line) {
 141                                 sz = strlen(reply_line);
 142                                 if (sz == 0)
 143                                         buf[sz++] = '\n';
 144                                 else
 145                                         memcpy(buf, reply_line, min(sz, bufsz));
 146                                 buf[min(sz, bufsz - 1)] = '\0';
 147                                 free(reply_line);
 148                                 reply_line = NULL;
 149                         }
 150                 } else
 151 #endif
 152                 {
 153                         if (!fgets(buf, bufsz, stdin))
 154                                 *buf = '\0';
 155                         break;
 156                 }
 157         } while (reply_running);
 158
 159         if (!*buf) {
 160                 DBG(ASK, ul_debug("cancel by CTRL+D"));
 161                 ret = -ECANCELED;
 162                 clearerr(stdin);
 163                 goto done;
 164         }
 165
 166         /*
 167          * cleanup the reply
 168          */
 169         sz = ltrim_whitespace((unsigned char *) buf);
 170         if (sz && *(buf + sz - 1) == '\n')
 171                 *(buf + sz - 1) = '\0';
 172
 173 done:
 174 #ifdef HAVE_LIBREADLINE
 175         if (is_interactive)
 176                 rl_callback_handler_remove();
 177 #endif
 178         sigaction(SIGINT, &oldact, NULL);
 179         DBG(ASK, ul_debug("user's reply: >>>%s<<< [rc=%d]", buf, ret));
 180         return ret;
 181 }
 182
 183 static int ask_menu(struct fdisk_context *cxt, struct fdisk_ask *ask,
 184                     char *buf, size_t bufsz)
 185
 186 {
 187         const char *q = fdisk_ask_get_query(ask);
 188         int dft = fdisk_ask_menu_get_default(ask);
 189
 190         if (q) {
 191                 fputs(q, stdout);               /* print header */
 192                 fputc('\n', stdout);
 193         }
 194
 195         do {
 196                 char prompt[128];
 197                 int key, c, rc;
 198                 const char *name, *desc;
 199                 size_t i = 0;
 200
 201                 /* print menu items */
 202                 while (fdisk_ask_menu_get_item(ask, i++, &key, &name, &desc) == 0)
 203                         fprintf(stdout, "   %c   %s (%s)\n", key, name, desc);
 204
 205                 /* ask for key */
 206                 snprintf(prompt, sizeof(prompt), _("Select (default %c): "), dft);
 207                 rc = get_user_reply(prompt, buf, bufsz);
 208                 if (rc)
 209                         return rc;
 210                 if (!*buf) {
 211                         fdisk_info(cxt, _("Using default response %c."), dft);
 212                         c = dft;
 213                 } else
 214                         c = tolower(buf[0]);
 215
 216                 /* check result */
 217                 i = 0;
 218                 while (fdisk_ask_menu_get_item(ask, i++, &key, NULL, NULL) == 0) {
 219                         if (c == key) {
 220                                 fdisk_ask_menu_set_result(ask, c);
 221                                 return 0;       /* success */
 222                         }
 223                 }
 224                 fdisk_warnx(cxt, _("Value out of range."));
 225         } while (1);
 226
 227         return -EINVAL;
 228 }
 229
 230
 231 #define tochar(num)     ((int) ('a' + num - 1))
 232 static int ask_number(struct fdisk_context *cxt,
 233                       struct fdisk_ask *ask,
 234                       char *buf, size_t bufsz)
 235 {
 236         char prompt[128] = { '\0' };
 237         const char *q = fdisk_ask_get_query(ask);
 238         const char *range = fdisk_ask_number_get_range(ask);
 239
 240         uint64_t dflt = fdisk_ask_number_get_default(ask),
 241                  low = fdisk_ask_number_get_low(ask),
 242                  high = fdisk_ask_number_get_high(ask);
 243         int inchar = fdisk_ask_number_inchars(ask);
 244
 245         assert(q);
 246
 247         DBG(ASK, ul_debug("asking for number "
 248                         "['%s', <%"PRIu64",%"PRIu64">, default=%"PRIu64", range: %s]",
 249                         q, low, high, dflt, range));
 250
 251         if (range && dflt >= low && dflt <= high) {
 252                 if (inchar)
 253                         snprintf(prompt, sizeof(prompt), _("%s (%s, default %c): "),
 254                                         q, range, tochar(dflt));
 255                 else
 256                         snprintf(prompt, sizeof(prompt), _("%s (%s, default %"PRIu64"): "),
 257                                         q, range, dflt);
 258
 259         } else if (dflt >= low && dflt <= high) {
 260                 if (inchar)
 261                         snprintf(prompt, sizeof(prompt), _("%s (%c-%c, default %c): "),
 262                                         q, tochar(low), tochar(high), tochar(dflt));
 263                 else
 264                         snprintf(prompt, sizeof(prompt),
 265                                         _("%s (%"PRIu64"-%"PRIu64", default %"PRIu64"): "),
 266                                         q, low, high, dflt);
 267         } else if (inchar)
 268                 snprintf(prompt, sizeof(prompt), _("%s (%c-%c): "),
 269                                 q, tochar(low), tochar(high));
 270         else
 271                 snprintf(prompt, sizeof(prompt), _("%s (%"PRIu64"-%"PRIu64"): "),
 272                                 q, low, high);
 273
 274         do {
 275                 int rc = get_user_reply(prompt, buf, bufsz);
 276                 uint64_t num = 0;
 277
 278                 if (rc)
 279                         return rc;
 280                 if (!*buf && dflt >= low && dflt <= high)
 281                         return fdisk_ask_number_set_result(ask, dflt);
 282
 283                 if (isdigit_string(buf)) {
 284                         char *end;
 285
 286                         errno = 0;
 287                         num = strtoumax(buf, &end, 10);
 288                         if (errno || buf == end || (end && *end))
 289                                 continue;
 290                 } else if (inchar && isalpha(*buf)) {
 291                         num = tolower(*buf) - 'a' + 1;
 292                 } else
 293                         rc = -EINVAL;
 294
 295                 if (rc == 0 && num >= low && num <= high)
 296                         return fdisk_ask_number_set_result(ask, num);
 297
 298                 fdisk_warnx(cxt, _("Value out of range."));
 299         } while (1);
 300
 301         return -1;
 302 }
 303
 304 static int ask_offset(struct fdisk_context *cxt,
 305                       struct fdisk_ask *ask,
 306                       char *buf, size_t bufsz)
 307 {
 308         char prompt[128] = { '\0' };
 309         const char *q = fdisk_ask_get_query(ask);
 310         const char *range = fdisk_ask_number_get_range(ask);
 311
 312         uint64_t dflt = fdisk_ask_number_get_default(ask),
 313                  low = fdisk_ask_number_get_low(ask),
 314                  high = fdisk_ask_number_get_high(ask),
 315                  base = fdisk_ask_number_get_base(ask);
 316
 317         assert(q);
 318
 319         DBG(ASK, ul_debug("asking for offset ['%s', <%"PRIu64",%"PRIu64">, base=%"PRIu64", default=%"PRIu64", range: %s]",
 320                                 q, low, high, base, dflt, range));
 321
 322         if (range && dflt >= low && dflt <= high)
 323                 snprintf(prompt, sizeof(prompt), _("%s (%s, default %"PRIu64"): "),
 324                          q, range, dflt);
 325         else if (dflt >= low && dflt <= high)
 326                 snprintf(prompt, sizeof(prompt),
 327                          _("%s (%"PRIu64"-%"PRIu64", default %"PRIu64"): "),
 328                          q, low, high, dflt);
 329         else
 330                 snprintf(prompt, sizeof(prompt), _("%s (%"PRIu64"-%"PRIu64"): "),
 331                          q, low, high);
 332
 333         do {
 334                 uintmax_t num = 0;
 335                 char sig = 0, *p;
 336                 int pwr = 0;
 337
 338                 int rc = get_user_reply(prompt, buf, bufsz);
 339                 if (rc)
 340                         return rc;
 341                 if (!*buf && dflt >= low && dflt <= high)
 342                         return fdisk_ask_number_set_result(ask, dflt);
 343
 344                 p = buf;
 345                 if (*p == '+' || *p == '-') {
 346                         sig = *buf;
 347                         p++;
 348                 }
 349
 350                 rc = parse_size(p, &num, &pwr);
 351                 if (rc)
 352                         continue;
 353                 DBG(ASK, ul_debug("parsed size: %ju", num));
 354                 if (sig && pwr) {
 355                         /* +{size}{K,M,...} specified, the "num" is in bytes */
 356                         uint64_t unit = fdisk_ask_number_get_unit(ask);
 357                         num += unit/2;  /* round */
 358                         num /= unit;
 359                 }
 360                 if (sig == '+')
 361                         num += base;
 362                 else if (sig == '-' && fdisk_ask_number_is_wrap_negative(ask))
 363                         num = high - num;
 364                 else if (sig == '-')
 365                         num = base - num;
 366
 367                 DBG(ASK, ul_debug("final offset: %ju [sig: %c, power: %d, %s]",
 368                                 num, sig, pwr,
 369                                 sig ? "relative" : "absolute"));
 370                 if (num >= low && num <= high) {
 371                         if (sig && pwr)
 372                                 fdisk_ask_number_set_relative(ask, 1);
 373                         return fdisk_ask_number_set_result(ask, (uint64_t)num);
 374                 }
 375                 fdisk_warnx(cxt, _("Value out of range."));
 376         } while (1);
 377
 378         return -1;
 379 }
 380
 381 static unsigned int info_count;
 382
 383 static void fputs_info(struct fdisk_ask *ask, FILE *out)
 384 {
 385         const char *msg;
 386         assert(ask);
 387
 388         msg = fdisk_ask_print_get_mesg(ask);
 389         if (!msg)
 390                 return;
 391         if (info_count == 1)
 392                 fputc('\n', out);
 393
 394         fputs(msg, out);
 395         fputc('\n', out);
 396 }
 397
 398 int ask_callback(struct fdisk_context *cxt, struct fdisk_ask *ask,
 399                     void *data __attribute__((__unused__)))
 400 {
 401         int rc = 0;
 402         char buf[BUFSIZ] = { '\0' };
 403
 404         assert(cxt);
 405         assert(ask);
 406
 407         if (fdisk_ask_get_type(ask) != FDISK_ASKTYPE_INFO)
 408                 info_count = 0;
 409
 410         switch(fdisk_ask_get_type(ask)) {
 411         case FDISK_ASKTYPE_MENU:
 412                 return ask_menu(cxt, ask, buf, sizeof(buf));
 413         case FDISK_ASKTYPE_NUMBER:
 414                 return ask_number(cxt, ask, buf, sizeof(buf));
 415         case FDISK_ASKTYPE_OFFSET:
 416                 return ask_offset(cxt, ask, buf, sizeof(buf));
 417         case FDISK_ASKTYPE_INFO:
 418                 if (!fdisk_is_listonly(cxt))
 419                         info_count++;
 420                 fputs_info(ask, stdout);
 421                 break;
 422         case FDISK_ASKTYPE_WARNX:
 423                 fflush(stdout);
 424                 color_scheme_fenable("warn", UL_COLOR_RED, stderr);
 425                 fputs(fdisk_ask_print_get_mesg(ask), stderr);
 426                 color_fdisable(stderr);
 427                 fputc('\n', stderr);
 428                 break;
 429         case FDISK_ASKTYPE_WARN:
 430                 fflush(stdout);
 431                 color_scheme_fenable("warn", UL_COLOR_RED, stderr);
 432                 fputs(fdisk_ask_print_get_mesg(ask), stderr);
 433                 errno = fdisk_ask_print_get_errno(ask);
 434                 fprintf(stderr, ": %m\n");
 435                 color_fdisable(stderr);
 436                 break;
 437         case FDISK_ASKTYPE_YESNO:
 438                 fputc('\n', stdout);
 439                 do {
 440                         int x;
 441                         fputs(fdisk_ask_get_query(ask), stdout);
 442                         rc = get_user_reply(_(" [Y]es/[N]o: "), buf, sizeof(buf));
 443                         if (rc)
 444                                 break;
 445                         x = rpmatch(buf);
 446                         if (x == RPMATCH_YES || x == RPMATCH_NO) {
 447                                 fdisk_ask_yesno_set_result(ask, x);
 448                                 break;
 449                         }
 450                 } while(1);
 451                 DBG(ASK, ul_debug("yes-no ask: reply '%s' [rc=%d]", buf, rc));
 452                 break;
 453         case FDISK_ASKTYPE_STRING:
 454         {
 455                 char prmt[BUFSIZ];
 456                 snprintf(prmt, sizeof(prmt), "%s: ", fdisk_ask_get_query(ask));
 457                 fputc('\n', stdout);
 458                 rc = get_user_reply(prmt, buf, sizeof(buf));
 459                 if (rc == 0)
 460                         fdisk_ask_string_set_result(ask, xstrdup(buf));
 461                 DBG(ASK, ul_debug("string ask: reply '%s' [rc=%d]", buf, rc));
 462                 break;
 463         }
 464         default:
 465                 warnx(_("internal error: unsupported dialog type %d"), fdisk_ask_get_type(ask));
 466                 return -EINVAL;
 467         }
 468         return rc;
 469 }
 470
 471 static struct fdisk_parttype *ask_partition_type(struct fdisk_context *cxt, int *canceled)
 472 {
 473         const char *q;
 474         struct fdisk_label *lb;
 475
 476         assert(cxt);
 477         lb = fdisk_get_label(cxt, NULL);
 478
 479         if (!lb)
 480                 return NULL;
 481
 482         *canceled = 0;
 483         q = fdisk_label_has_code_parttypes(lb) ?
 484                 _("Hex code (type L to list all codes): ") :
 485                 _("Partition type (type L to list all types): ");
 486         do {
 487                 char buf[256] = { '\0' };
 488                 int rc = get_user_reply(q, buf, sizeof(buf));
 489
 490                 if (rc) {
 491                         if (rc == -ECANCELED)
 492                                 *canceled = 1;
 493                         break;
 494                 }
 495
 496                 if (buf[1] == '\0' && toupper(*buf) == 'L')
 497                         list_partition_types(cxt);
 498                 else if (*buf) {
 499                         struct fdisk_parttype *t = fdisk_label_parse_parttype(lb, buf);
 500
 501                         if (!t)
 502                                 fdisk_info(cxt, _("Failed to parse '%s' partition type."), buf);
 503                         return t;
 504                 }
 505         } while (1);
 506
 507         return NULL;
 508 }
 509
 510
 511 void list_partition_types(struct fdisk_context *cxt)
 512 {
 513         size_t ntypes = 0;
 514         struct fdisk_label *lb;
 515
 516         assert(cxt);
 517         lb = fdisk_get_label(cxt, NULL);
 518         if (!lb)
 519                 return;
 520         ntypes = fdisk_label_get_nparttypes(lb);
 521         if (!ntypes)
 522                 return;
 523
 524         if (fdisk_label_has_code_parttypes(lb)) {
 525                 /*
 526                  * Prints in 4 columns in format <hex> <name>
 527                  */
 528                 size_t last[4], done = 0, next = 0, size;
 529                 int i;
 530
 531                 size = ntypes;
 532
 533                 for (i = 3; i >= 0; i--)
 534                         last[3 - i] = done += (size + i - done) / (i + 1);
 535                 i = done = 0;
 536
 537                 do {
 538                         #define NAME_WIDTH 15
 539                         char name[NAME_WIDTH * MB_LEN_MAX];
 540                         size_t width = NAME_WIDTH;
 541                         const struct fdisk_parttype *t = fdisk_label_get_parttype(lb, next);
 542                         size_t ret;
 543
 544                         if (fdisk_parttype_get_name(t)) {
 545                                 printf("%c%2x  ", i ? ' ' : '\n',
 546                                                 fdisk_parttype_get_code(t));
 547                                 ret = mbsalign(_(fdisk_parttype_get_name(t)),
 548                                                 name, sizeof(name),
 549                                                 &width, MBS_ALIGN_LEFT, 0);
 550
 551                                 if (ret == (size_t)-1 || ret >= sizeof(name))
 552                                         printf("%-15.15s",
 553                                                 _(fdisk_parttype_get_name(t)));
 554                                 else
 555                                         fputs(name, stdout);
 556                         }
 557
 558                         next = last[i++] + done;
 559                         if (i > 3 || next >= last[i]) {
 560                                 i = 0;
 561                                 next = ++done;
 562                         }
 563                 } while (done < last[0]);
 564
 565         } else {
 566                 /*
 567                  * Prints 1 column in format <idx> <name> <typestr>
 568                  */
 569                 size_t i;
 570
 571                 pager_open();
 572
 573                 for (i = 0; i < ntypes; i++) {
 574                         const struct fdisk_parttype *t = fdisk_label_get_parttype(lb, i);
 575                         printf("%3zu %-30s %s\n", i + 1,
 576                                         fdisk_parttype_get_name(t),
 577                                         fdisk_parttype_get_string(t));
 578                 }
 579
 580                 pager_close();
 581         }
 582         putchar('\n');
 583 }
 584
 585 void toggle_dos_compatibility_flag(struct fdisk_context *cxt)
 586 {
 587         struct fdisk_label *lb = fdisk_get_label(cxt, "dos");
 588         int flag;
 589
 590         if (!lb)
 591                 return;
 592
 593         flag = !fdisk_dos_is_compatible(lb);
 594         fdisk_info(cxt, flag ?
 595                         _("DOS Compatibility flag is set (DEPRECATED!)") :
 596                         _("DOS Compatibility flag is not set"));
 597
 598         fdisk_dos_enable_compatible(lb, flag);
 599
 600         if (fdisk_is_label(cxt, DOS))
 601                 fdisk_reset_alignment(cxt);     /* reset the current label */
 602 }
 603
 604 void change_partition_type(struct fdisk_context *cxt)
 605 {
 606         size_t i;
 607         struct fdisk_parttype *t = NULL;
 608         struct fdisk_partition *pa = NULL;
 609         const char *old = NULL;
 610         int canceled = 0;
 611
 612         assert(cxt);
 613
 614         if (fdisk_ask_partnum(cxt, &i, FALSE))
 615                 return;
 616
 617         if (fdisk_get_partition(cxt, i, &pa)) {
 618                 fdisk_warnx(cxt, _("Partition %zu does not exist yet!"), i + 1);
 619                 return;
 620         }
 621
 622         t = (struct fdisk_parttype *) fdisk_partition_get_type(pa);
 623         old = t ? fdisk_parttype_get_name(t) : _("Unknown");
 624
 625         do {
 626                 t = ask_partition_type(cxt, &canceled);
 627                 if (canceled)
 628                         break;
 629         } while (!t);
 630
 631         if (canceled == 0 && t && fdisk_set_partition_type(cxt, i, t) == 0)
 632                 fdisk_info(cxt,
 633                         _("Changed type of partition '%s' to '%s'."),
 634                         old, t ? fdisk_parttype_get_name(t) : _("Unknown"));
 635         else
 636                 fdisk_info(cxt,
 637                         _("Type of partition %zu is unchanged: %s."),
 638                         i + 1, old);
 639
 640         fdisk_unref_partition(pa);
 641         fdisk_unref_parttype(t);
 642 }
 643
 644 int print_partition_info(struct fdisk_context *cxt)
 645 {
 646         struct fdisk_partition *pa = NULL;
 647         int rc = 0;
 648         size_t i, nfields;
 649         int *fields = NULL;
 650         struct fdisk_label *lb = fdisk_get_label(cxt, NULL);
 651
 652         if ((rc = fdisk_ask_partnum(cxt, &i, FALSE)))
 653                 return rc;
 654
 655         if ((rc = fdisk_get_partition(cxt, i, &pa))) {
 656                 fdisk_warnx(cxt, _("Partition %zu does not exist yet!"), i + 1);
 657                 return rc;
 658         }
 659
 660         if ((rc = fdisk_label_get_fields_ids_all(lb, cxt, &fields, &nfields)))
 661                 goto clean_data;
 662
 663         for (i = 0; i < nfields; ++i) {
 664                 int id = fields[i];
 665                 char *data = NULL;
 666                 const struct fdisk_field *fd = fdisk_label_get_field(lb, id);
 667
 668                 if (!fd)
 669                         continue;
 670
 671                 rc = fdisk_partition_to_string(pa, cxt, id, &data);
 672                 if (rc < 0)
 673                         goto clean_data;
 674                 if (!data || !*data)
 675                         continue;
 676                 fdisk_info(cxt, "%15s: %s", fdisk_field_get_name(fd), data);
 677                 free(data);
 678         }
 679
 680 clean_data:
 681         fdisk_unref_partition(pa);
 682         free(fields);
 683         return rc;
 684 }
 685
 686 static size_t skip_empty(const unsigned char *buf, size_t i, size_t sz)
 687 {
 688         size_t next;
 689         const unsigned char *p0 = buf + i;
 690
 691         for (next = i + 16; next < sz; next += 16) {
 692                 if (memcmp(p0, buf + next, 16) != 0)
 693                         break;
 694         }
 695
 696         return next == i + 16 ? i : next;
 697 }
 698
 699 static void dump_buffer(off_t base, unsigned char *buf, size_t sz, int all)
 700 {
 701         size_t i, l, next = 0;
 702
 703         if (!buf)
 704                 return;
 705         for (i = 0, l = 0; i < sz; i++, l++) {
 706                 if (l == 0) {
 707                         if (all == 0 && !next)
 708                                 next = skip_empty(buf, i, sz);
 709                         printf("%08jx ", (intmax_t)base + i);
 710                 }
 711                 printf(" %02x", buf[i]);
 712                 if (l == 7)                             /* words separator */
 713                         fputs(" ", stdout);
 714                 else if (l == 15) {
 715                         fputc('\n', stdout);            /* next line */
 716                         l = -1;
 717                         if (next > i) {
 718                                 printf("*\n");
 719                                 i = next - 1;
 720                         }
 721                         next = 0;
 722                 }
 723         }
 724         if (l > 0)
 725                 printf("\n");
 726 }
 727
 728 static void dump_blkdev(struct fdisk_context *cxt, const char *name,
 729                         uint64_t offset, size_t size, int all)
 730 {
 731         int fd = fdisk_get_devfd(cxt);
 732
 733         fdisk_info(cxt, _("\n%s: offset = %"PRIu64", size = %zu bytes."),
 734                         name, offset, size);
 735
 736         assert(fd >= 0);
 737
 738         if (lseek(fd, (off_t) offset, SEEK_SET) == (off_t) -1)
 739                 fdisk_warn(cxt, _("cannot seek"));
 740         else {
 741                 unsigned char *buf = xmalloc(size);
 742
 743                 if (read_all(fd, (char *) buf, size) != (ssize_t) size)
 744                         fdisk_warn(cxt, _("cannot read"));
 745                 else
 746                         dump_buffer(offset, buf, size, all);
 747                 free(buf);
 748         }
 749 }
 750
 751 void dump_firstsector(struct fdisk_context *cxt)
 752 {
 753         int all = !isatty(STDOUT_FILENO);
 754
 755         assert(cxt);
 756
 757         dump_blkdev(cxt, _("First sector"), 0, fdisk_get_sector_size(cxt), all);
 758 }
 759
 760 void dump_disklabel(struct fdisk_context *cxt)
 761 {
 762         int all = !isatty(STDOUT_FILENO);
 763         int i = 0;
 764         const char *name = NULL;
 765         uint64_t offset = 0;
 766         size_t size = 0;
 767
 768         assert(cxt);
 769
 770         while (fdisk_locate_disklabel(cxt, i++, &name, &offset, &size) == 0 && size)
 771                 dump_blkdev(cxt, name, offset, size, all);
 772 }
 773
 774 static fdisk_sector_t get_dev_blocks(char *dev)
 775 {
 776         int fd, ret;
 777         fdisk_sector_t size;
 778
 779         if ((fd = open(dev, O_RDONLY)) < 0)
 780                 err(EXIT_FAILURE, _("cannot open %s"), dev);
 781         ret = blkdev_get_sectors(fd, (unsigned long long *) &size);
 782         close(fd);
 783         if (ret < 0)
 784                 err(EXIT_FAILURE, _("BLKGETSIZE ioctl failed on %s"), dev);
 785         return size/2;
 786 }
 787
 788
 789 void follow_wipe_mode(struct fdisk_context *cxt)
 790 {
 791         int dowipe = wipemode == WIPEMODE_ALWAYS ? 1 : 0;
 792
 793         if (isatty(STDIN_FILENO) && wipemode == WIPEMODE_AUTO)
 794                 dowipe = 1;     /* do it in interactive mode */
 795
 796         if (fdisk_is_ptcollision(cxt) && wipemode != WIPEMODE_NEVER)
 797                 dowipe = 1;     /* always remove old PT */
 798
 799         fdisk_enable_wipe(cxt, dowipe);
 800         if (dowipe)
 801                 fdisk_warnx(cxt, _(
 802                         "The device contains '%s' signature and it will be removed by a write command. "
 803                         "See fdisk(8) man page and --wipe option for more details."),
 804                         fdisk_get_collision(cxt));
 805         else
 806                 fdisk_warnx(cxt, _(
 807                         "The device contains '%s' signature and it may remain on the device. "
 808                         "It is recommended to wipe the device with wipefs(8) or "
 809                         "fdisk --wipe, in order to avoid possible collisions."),
 810                         fdisk_get_collision(cxt));
 811 }
 812
 813 static void __attribute__((__noreturn__)) usage(void)
 814 {
 815         FILE *out = stdout;
 816
 817         fputs(USAGE_HEADER, out);
 818
 819         fprintf(out,
 820               _(" %1$s [options] <disk>      change partition table\n"
 821                 " %1$s [options] -l [<disk>] list partition table(s)\n"),
 822                program_invocation_short_name);
 823
 824         fputs(USAGE_SEPARATOR, out);
 825         fputs(_("Display or manipulate a disk partition table.\n"), out);
 826
 827         fputs(USAGE_OPTIONS, out);
 828         fputs(_(" -b, --sector-size <size>      physical and logical sector size\n"), out);
 829         fputs(_(" -B, --protect-boot            don't erase bootbits when creating a new label\n"), out);
 830         fputs(_(" -c, --compatibility[=<mode>]  mode is 'dos' or 'nondos' (default)\n"), out);
 831         fprintf(out,
 832               _(" -L, --color[=<when>]          colorize output (%s, %s or %s)\n"), "auto", "always", "never");
 833         fprintf(out,
 834                 "                                 %s\n", USAGE_COLORS_DEFAULT);
 835         fputs(_(" -l, --list                    display partitions and exit\n"), out);
 836         fputs(_(" -o, --output <list>           output columns\n"), out);
 837         fputs(_(" -t, --type <type>             recognize specified partition table type only\n"), out);
 838         fputs(_(" -u, --units[=<unit>]          display units: 'cylinders' or 'sectors' (default)\n"), out);
 839         fputs(_(" -s, --getsz                   display device size in 512-byte sectors [DEPRECATED]\n"), out);
 840         fputs(_("     --bytes                   print SIZE in bytes rather than in human readable format\n"), out);
 841         fprintf(out,
 842               _(" -w, --wipe <mode>             wipe signatures (%s, %s or %s)\n"), "auto", "always", "never");
 843         fprintf(out,
 844               _(" -W, --wipe-partitions <mode>  wipe signatures from new partitions (%s, %s or %s)\n"), "auto", "always", "never");
 845
 846         fputs(USAGE_SEPARATOR, out);
 847         fputs(_(" -C, --cylinders <number>      specify the number of cylinders\n"), out);
 848         fputs(_(" -H, --heads <number>          specify the number of heads\n"), out);
 849         fputs(_(" -S, --sectors <number>        specify the number of sectors per track\n"), out);
 850
 851         fputs(USAGE_SEPARATOR, out);
 852         printf(USAGE_HELP_OPTIONS(31));
 853
 854         list_available_columns(out);
 855
 856         printf(USAGE_MAN_TAIL("fdisk(8)"));
 857         exit(EXIT_SUCCESS);
 858 }
 859
 860
 861 enum {
 862         ACT_FDISK = 0,  /* default */
 863         ACT_LIST,
 864         ACT_SHOWSIZE
 865 };
 866
 867 int main(int argc, char **argv)
 868 {
 869         int rc, i, c, act = ACT_FDISK;
 870         int colormode = UL_COLORMODE_UNDEF;
 871         struct fdisk_context *cxt;
 872         char *outarg = NULL;
 873         enum {
 874                 OPT_BYTES       = CHAR_MAX + 1
 875         };
 876         static const struct option longopts[] = {
 877                 { "bytes",          no_argument,       NULL, OPT_BYTES },
 878                 { "color",          optional_argument, NULL, 'L' },
 879                 { "compatibility",  optional_argument, NULL, 'c' },
 880                 { "cylinders",      required_argument, NULL, 'C' },
 881                 { "heads",          required_argument, NULL, 'H' },
 882                 { "sectors",        required_argument, NULL, 'S' },
 883                 { "getsz",          no_argument,       NULL, 's' },
 884                 { "help",           no_argument,       NULL, 'h' },
 885                 { "list",           no_argument,       NULL, 'l' },
 886                 { "sector-size",    required_argument, NULL, 'b' },
 887                 { "type",           required_argument, NULL, 't' },
 888                 { "units",          optional_argument, NULL, 'u' },
 889                 { "version",        no_argument,       NULL, 'V' },
 890                 { "output",         no_argument,       NULL, 'o' },
 891                 { "protect-boot",   no_argument,       NULL, 'B' },
 892                 { "wipe",           required_argument, NULL, 'w' },
 893                 { "wipe-partitions",required_argument, NULL, 'W' },
 894                 { NULL, 0, NULL, 0 }
 895         };
 896
 897         setlocale(LC_ALL, "");
 898         bindtextdomain(PACKAGE, LOCALEDIR);
 899         textdomain(PACKAGE);
 900         close_stdout_atexit();
 901
 902         fdisk_init_debug(0);
 903         scols_init_debug(0);
 904         fdiskprog_init_debug();
 905
 906         cxt = fdisk_new_context();
 907         if (!cxt)
 908                 err(EXIT_FAILURE, _("failed to allocate libfdisk context"));
 909
 910         fdisk_set_ask(cxt, ask_callback, NULL);
 911
 912         while ((c = getopt_long(argc, argv, "b:Bc::C:hH:lL::o:sS:t:u::vVw:W:",
 913                                 longopts, NULL)) != -1) {
 914                 switch (c) {
 915                 case 'b':
 916                 {
 917                         size_t sz = strtou32_or_err(optarg,
 918                                         _("invalid sector size argument"));
 919                         if (sz != 512 && sz != 1024 && sz != 2048 && sz != 4096)
 920                                 errx(EXIT_FAILURE, _("invalid sector size argument"));
 921                         fdisk_save_user_sector_size(cxt, sz, sz);
 922                         break;
 923                 }
 924                 case 'B':
 925                         fdisk_enable_bootbits_protection(cxt, 1);
 926                         break;
 927                 case 'C':
 928                         fdisk_save_user_geometry(cxt,
 929                                 strtou32_or_err(optarg,
 930                                                 _("invalid cylinders argument")),
 931                                 0, 0);
 932                         break;
 933                 case 'c':
 934                         if (optarg) {
 935                                 /* this setting is independent on the current
 936                                  * actively used label
 937                                  */
 938                                 char *p = *optarg == '=' ? optarg + 1 : optarg;
 939                                 struct fdisk_label *lb = fdisk_get_label(cxt, "dos");
 940
 941                                 if (!lb)
 942                                         err(EXIT_FAILURE, _("not found DOS label driver"));
 943                                 if (strcmp(p, "dos") == 0)
 944                                         fdisk_dos_enable_compatible(lb, TRUE);
 945                                 else if (strcmp(p, "nondos") == 0)
 946                                         fdisk_dos_enable_compatible(lb, FALSE);
 947                                 else
 948                                         errx(EXIT_FAILURE, _("unknown compatibility mode '%s'"), p);
 949                         }
 950                         /* use default if no optarg specified */
 951                         break;
 952                 case 'H':
 953                         fdisk_save_user_geometry(cxt, 0,
 954                                 strtou32_or_err(optarg,
 955                                                 _("invalid heads argument")),
 956                                 0);
 957                         break;
 958                 case 'S':
 959                         fdisk_save_user_geometry(cxt, 0, 0,
 960                                 strtou32_or_err(optarg,
 961                                         _("invalid sectors argument")));
 962                         break;
 963                 case 'l':
 964                         act = ACT_LIST;
 965                         break;
 966                 case 'L':
 967                         colormode = UL_COLORMODE_AUTO;
 968                         if (optarg)
 969                                 colormode = colormode_or_err(optarg,
 970                                                 _("unsupported color mode"));
 971                         break;
 972                 case 'o':
 973                         outarg = optarg;
 974                         break;
 975                 case 's':
 976                         act = ACT_SHOWSIZE;
 977                         break;
 978                 case 't':
 979                 {
 980                         struct fdisk_label *lb = NULL;
 981
 982                         while (fdisk_next_label(cxt, &lb) == 0)
 983                                 fdisk_label_set_disabled(lb, 1);
 984
 985                         lb = fdisk_get_label(cxt, optarg);
 986                         if (!lb)
 987                                 errx(EXIT_FAILURE, _("unsupported disklabel: %s"), optarg);
 988                         fdisk_label_set_disabled(lb, 0);
 989                         break;
 990                 }
 991                 case 'u':
 992                         if (optarg && *optarg == '=')
 993                                 optarg++;
 994                         if (fdisk_set_unit(cxt, optarg) != 0)
 995                                 errx(EXIT_FAILURE, _("unsupported unit"));
 996                         break;
 997                 case 'V': /* preferred for util-linux */
 998                 case 'v': /* for backward compatibility only */
 999                         print_version(EXIT_SUCCESS);
1000                 case 'w':
1001                         wipemode = wipemode_from_string(optarg);
1002                         if (wipemode < 0)
1003                                 errx(EXIT_FAILURE, _("unsupported wipe mode"));
1004                         break;
1005                 case 'W':
1006                         pwipemode = wipemode_from_string(optarg);
1007                         if (pwipemode < 0)
1008                                 errx(EXIT_FAILURE, _("unsupported wipe mode"));
1009                         break;
1010                 case 'h':
1011                         usage();
1012                 case OPT_BYTES:
1013                         fdisk_set_size_unit(cxt, FDISK_SIZEUNIT_BYTES);
1014                         break;
1015                 default:
1016                         errtryhelp(EXIT_FAILURE);
1017                 }
1018         }
1019
1020         if (argc-optind != 1 && fdisk_has_user_device_properties(cxt))
1021                 warnx(_("The device properties (sector size and geometry) should"
1022                         " be used with one specified device only."));
1023
1024         colors_init(colormode, "fdisk");
1025         is_interactive = isatty(STDIN_FILENO);
1026
1027         switch (act) {
1028         case ACT_LIST:
1029                 fdisk_enable_listonly(cxt, 1);
1030                 init_fields(cxt, outarg, NULL);
1031
1032                 if (argc > optind) {
1033                         int k;
1034                         int ct = 0;
1035
1036                         for (rc = 0, k = optind; k < argc; k++) {
1037                                 if (ct)
1038                                     fputs("\n\n", stdout);
1039
1040                                 rc += print_device_pt(cxt, argv[k], 1, 0);
1041                                 ct++;
1042                         }
1043                         if (rc)
1044                                 return EXIT_FAILURE;
1045                 } else
1046                         print_all_devices_pt(cxt, 0);
1047                 break;
1048
1049         case ACT_SHOWSIZE:
1050                 /* deprecated */
1051                 if (argc - optind <= 0) {
1052                         warnx(_("bad usage"));
1053                         errtryhelp(EXIT_FAILURE);
1054                 }
1055                 for (i = optind; i < argc; i++) {
1056                         uintmax_t blks = get_dev_blocks(argv[i]);
1057
1058                         if (argc - optind == 1)
1059                                 printf("%ju\n", blks);
1060                         else
1061                                 printf("%s: %ju\n", argv[i], blks);
1062                 }
1063                 break;
1064
1065         case ACT_FDISK:
1066                 if (argc-optind != 1) {
1067                         warnx(_("bad usage"));
1068                         errtryhelp(EXIT_FAILURE);
1069                 }
1070
1071                 /* Here starts interactive mode, use fdisk_{warn,info,..} functions */
1072                 color_scheme_enable("welcome", UL_COLOR_GREEN);
1073                 fdisk_info(cxt, _("Welcome to fdisk (%s)."), PACKAGE_STRING);
1074                 color_disable();
1075                 fdisk_info(cxt, _("Changes will remain in memory only, until you decide to write them.\n"
1076                                   "Be careful before using the write command.\n"));
1077
1078                 rc = fdisk_assign_device(cxt, argv[optind], 0);
1079                 if (rc == -EACCES) {
1080                         rc = fdisk_assign_device(cxt, argv[optind], 1);
1081                         if (rc == 0)
1082                                 fdisk_warnx(cxt, _("Device is open in read-only mode."));
1083                 }
1084                 if (rc)
1085                         err(EXIT_FAILURE, _("cannot open %s"), argv[optind]);
1086
1087                 fflush(stdout);
1088
1089                 if (fdisk_get_collision(cxt))
1090                         follow_wipe_mode(cxt);
1091
1092                 if (!fdisk_has_label(cxt)) {
1093                         fdisk_info(cxt, _("Device does not contain a recognized partition table."));
1094                         fdisk_create_disklabel(cxt, NULL);
1095
1096                 } else if (fdisk_is_label(cxt, GPT) && fdisk_gpt_is_hybrid(cxt))
1097                         fdisk_warnx(cxt, _(
1098                                   "A hybrid GPT was detected. You have to sync "
1099                                   "the hybrid MBR manually (expert command 'M')."));
1100
1101                 init_fields(cxt, outarg, NULL);         /* -o <columns> */
1102
1103                 if (!fdisk_is_readonly(cxt)) {
1104                         fdisk_get_partitions(cxt, &original_layout);
1105                         device_is_used = fdisk_device_is_used(cxt);
1106                 }
1107
1108                 while (1)
1109                         process_fdisk_menu(&cxt);
1110         }
1111
1112         fdisk_unref_context(cxt);
1113         return EXIT_SUCCESS;
1114 }