contrib/libarchive/tar/bsdtar.c

   1 /*-
   2  * Copyright (c) 2003-2008 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "bsdtar_platform.h"
  27 __FBSDID("$FreeBSD: src/usr.bin/tar/bsdtar.c,v 1.93 2008/11/08 04:43:24 kientzle Exp $");
  28
  29 #ifdef HAVE_SYS_PARAM_H
  30 #include <sys/param.h>
  31 #endif
  32 #ifdef HAVE_SYS_STAT_H
  33 #include <sys/stat.h>
  34 #endif
  35 #ifdef HAVE_ERRNO_H
  36 #include <errno.h>
  37 #endif
  38 #ifdef HAVE_FCNTL_H
  39 #include <fcntl.h>
  40 #endif
  41 #ifdef HAVE_LANGINFO_H
  42 #include <langinfo.h>
  43 #endif
  44 #ifdef HAVE_LOCALE_H
  45 #include <locale.h>
  46 #endif
  47 #ifdef HAVE_PATHS_H
  48 #include <paths.h>
  49 #endif
  50 #ifdef HAVE_SIGNAL_H
  51 #include <signal.h>
  52 #endif
  53 #include <stdio.h>
  54 #ifdef HAVE_STDLIB_H
  55 #include <stdlib.h>
  56 #endif
  57 #ifdef HAVE_STRING_H
  58 #include <string.h>
  59 #endif
  60 #ifdef HAVE_TIME_H
  61 #include <time.h>
  62 #endif
  63 #ifdef HAVE_UNISTD_H
  64 #include <unistd.h>
  65 #endif
  66 #if HAVE_ZLIB_H
  67 #include <zlib.h>
  68 #endif
  69
  70 #include "bsdtar.h"
  71 #include "err.h"
  72
  73 /*
  74  * Per POSIX.1-1988, tar defaults to reading/writing archives to/from
  75  * the default tape device for the system.  Pick something reasonable here.
  76  */
  77 #ifdef __linux
  78 #define _PATH_DEFTAPE "/dev/st0"
  79 #endif
  80 #if defined(_WIN32) && !defined(__CYGWIN__)
  81 #define _PATH_DEFTAPE "\\\\.\\tape0"
  82 #endif
  83
  84 #ifndef _PATH_DEFTAPE
  85 #define _PATH_DEFTAPE "/dev/tape"
  86 #endif
  87
  88 #ifdef __MINGW32__
  89 int _CRT_glob = 0; /* Disable broken CRT globbing. */
  90 #endif
  91
  92 static struct bsdtar *_bsdtar;
  93
  94 #if defined(HAVE_SIGACTION) && (defined(SIGINFO) || defined(SIGUSR1))
  95 static volatile int siginfo_occurred;
  96
  97 static void
  98 siginfo_handler(int sig)
  99 {
 100         (void)sig; /* UNUSED */
 101         siginfo_occurred = 1;
 102 }
 103
 104 int
 105 need_report(void)
 106 {
 107         int r = siginfo_occurred;
 108         siginfo_occurred = 0;
 109         return (r);
 110 }
 111 #else
 112 int
 113 need_report(void)
 114 {
 115         return (0);
 116 }
 117 #endif
 118
 119 /* External function to parse a date/time string */
 120 time_t get_date(time_t, const char *);
 121
 122 static void              long_help(void);
 123 static void              only_mode(struct bsdtar *, const char *opt,
 124                              const char *valid);
 125 static void              set_mode(struct bsdtar *, char opt);
 126 static void              version(void);
 127
 128 /* A basic set of security flags to request from libarchive. */
 129 #define SECURITY                                        \
 130         (ARCHIVE_EXTRACT_SECURE_SYMLINKS                \
 131          | ARCHIVE_EXTRACT_SECURE_NODOTDOT)
 132
 133 int
 134 main(int argc, char **argv)
 135 {
 136         struct bsdtar           *bsdtar, bsdtar_storage;
 137         int                      opt, t;
 138         char                     option_o;
 139         char                     possible_help_request;
 140         char                     buff[16];
 141         time_t                   now;
 142
 143         /*
 144          * Use a pointer for consistency, but stack-allocated storage
 145          * for ease of cleanup.
 146          */
 147         _bsdtar = bsdtar = &bsdtar_storage;
 148         memset(bsdtar, 0, sizeof(*bsdtar));
 149         bsdtar->fd = -1; /* Mark as "unused" */
 150         option_o = 0;
 151
 152 #if defined(HAVE_SIGACTION) && (defined(SIGINFO) || defined(SIGUSR1))
 153         { /* Catch SIGINFO and SIGUSR1, if they exist. */
 154                 struct sigaction sa;
 155                 sa.sa_handler = siginfo_handler;
 156                 sigemptyset(&sa.sa_mask);
 157                 sa.sa_flags = 0;
 158 #ifdef SIGINFO
 159                 if (sigaction(SIGINFO, &sa, NULL))
 160                         lafe_errc(1, errno, "sigaction(SIGINFO) failed");
 161 #endif
 162 #ifdef SIGUSR1
 163                 /* ... and treat SIGUSR1 the same way as SIGINFO. */
 164                 if (sigaction(SIGUSR1, &sa, NULL))
 165                         lafe_errc(1, errno, "sigaction(SIGUSR1) failed");
 166 #endif
 167         }
 168 #endif
 169
 170
 171         /* Need lafe_progname before calling lafe_warnc. */
 172         if (*argv == NULL)
 173                 lafe_progname = "bsdtar";
 174         else {
 175 #if defined(_WIN32) && !defined(__CYGWIN__)
 176                 lafe_progname = strrchr(*argv, '\\');
 177 #else
 178                 lafe_progname = strrchr(*argv, '/');
 179 #endif
 180                 if (lafe_progname != NULL)
 181                         lafe_progname++;
 182                 else
 183                         lafe_progname = *argv;
 184         }
 185
 186         time(&now);
 187
 188 #if HAVE_SETLOCALE
 189         if (setlocale(LC_ALL, "") == NULL)
 190                 lafe_warnc(0, "Failed to set default locale");
 191 #endif
 192 #if defined(HAVE_NL_LANGINFO) && defined(HAVE_D_MD_ORDER)
 193         bsdtar->day_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 194 #endif
 195         possible_help_request = 0;
 196
 197         /* Look up uid of current user for future reference */
 198         bsdtar->user_uid = geteuid();
 199
 200         /* Default: open tape drive. */
 201         bsdtar->filename = getenv("TAPE");
 202         if (bsdtar->filename == NULL)
 203                 bsdtar->filename = _PATH_DEFTAPE;
 204
 205         /* Default: preserve mod time on extract */
 206         bsdtar->extract_flags = ARCHIVE_EXTRACT_TIME;
 207
 208         /* Default: Perform basic security checks. */
 209         bsdtar->extract_flags |= SECURITY;
 210
 211 #ifndef _WIN32
 212         /* On POSIX systems, assume --same-owner and -p when run by
 213          * the root user.  This doesn't make any sense on Windows. */
 214         if (bsdtar->user_uid == 0) {
 215                 /* --same-owner */
 216                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
 217                 /* -p */
 218                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
 219                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
 220                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
 221                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
 222         }
 223 #endif
 224
 225         bsdtar->argv = argv;
 226         bsdtar->argc = argc;
 227
 228         /*
 229          * Comments following each option indicate where that option
 230          * originated:  SUSv2, POSIX, GNU tar, star, etc.  If there's
 231          * no such comment, then I don't know of anyone else who
 232          * implements that option.
 233          */
 234         while ((opt = bsdtar_getopt(bsdtar)) != -1) {
 235                 switch (opt) {
 236                 case 'B': /* GNU tar */
 237                         /* libarchive doesn't need this; just ignore it. */
 238                         break;
 239                 case 'b': /* SUSv2 */
 240                         t = atoi(bsdtar->optarg);
 241                         if (t <= 0 || t > 8192)
 242                                 lafe_errc(1, 0,
 243                                     "Argument to -b is out of range (1..8192)");
 244                         bsdtar->bytes_per_block = 512 * t;
 245                         break;
 246                 case 'C': /* GNU tar */
 247                         set_chdir(bsdtar, bsdtar->optarg);
 248                         break;
 249                 case 'c': /* SUSv2 */
 250                         set_mode(bsdtar, opt);
 251                         break;
 252                 case OPTION_CHECK_LINKS: /* GNU tar */
 253                         bsdtar->option_warn_links = 1;
 254                         break;
 255                 case OPTION_CHROOT: /* NetBSD */
 256                         bsdtar->option_chroot = 1;
 257                         break;
 258                 case OPTION_EXCLUDE: /* GNU tar */
 259                         if (lafe_exclude(&bsdtar->matching, bsdtar->optarg))
 260                                 lafe_errc(1, 0,
 261                                     "Couldn't exclude %s\n", bsdtar->optarg);
 262                         break;
 263                 case OPTION_FORMAT: /* GNU tar, others */
 264                         bsdtar->create_format = bsdtar->optarg;
 265                         break;
 266                 case OPTION_OPTIONS:
 267                         bsdtar->option_options = bsdtar->optarg;
 268                         break;
 269                 case 'f': /* SUSv2 */
 270                         bsdtar->filename = bsdtar->optarg;
 271                         if (strcmp(bsdtar->filename, "-") == 0)
 272                                 bsdtar->filename = NULL;
 273                         break;
 274                 case 'H': /* BSD convention */
 275                         bsdtar->symlink_mode = 'H';
 276                         break;
 277                 case 'h': /* Linux Standards Base, gtar; synonym for -L */
 278                         bsdtar->symlink_mode = 'L';
 279                         /* Hack: -h by itself is the "help" command. */
 280                         possible_help_request = 1;
 281                         break;
 282                 case OPTION_HELP: /* GNU tar, others */
 283                         long_help();
 284                         exit(0);
 285                         break;
 286                 case 'I': /* GNU tar */
 287                         /*
 288                          * TODO: Allow 'names' to come from an archive,
 289                          * not just a text file.  Design a good UI for
 290                          * allowing names and mode/owner to be read
 291                          * from an archive, with contents coming from
 292                          * disk.  This can be used to "refresh" an
 293                          * archive or to design archives with special
 294                          * permissions without having to create those
 295                          * permissions on disk.
 296                          */
 297                         bsdtar->names_from_file = bsdtar->optarg;
 298                         break;
 299                 case OPTION_INCLUDE:
 300                         /*
 301                          * Noone else has the @archive extension, so
 302                          * noone else needs this to filter entries
 303                          * when transforming archives.
 304                          */
 305                         if (lafe_include(&bsdtar->matching, bsdtar->optarg))
 306                                 lafe_errc(1, 0,
 307                                     "Failed to add %s to inclusion list",
 308                                     bsdtar->optarg);
 309                         break;
 310                 case 'j': /* GNU tar */
 311                         if (bsdtar->create_compression != '\0')
 312                                 lafe_errc(1, 0,
 313                                     "Can't specify both -%c and -%c", opt,
 314                                     bsdtar->create_compression);
 315                         bsdtar->create_compression = opt;
 316                         break;
 317                 case 'J': /* GNU tar 1.21 and later */
 318                         if (bsdtar->create_compression != '\0')
 319                                 lafe_errc(1, 0,
 320                                     "Can't specify both -%c and -%c", opt,
 321                                     bsdtar->create_compression);
 322                         bsdtar->create_compression = opt;
 323                         break;
 324                 case 'k': /* GNU tar */
 325                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE;
 326                         break;
 327                 case OPTION_KEEP_NEWER_FILES: /* GNU tar */
 328                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
 329                         break;
 330                 case 'L': /* BSD convention */
 331                         bsdtar->symlink_mode = 'L';
 332                         break;
 333                 case 'l': /* SUSv2 and GNU tar beginning with 1.16 */
 334                         /* GNU tar 1.13  used -l for --one-file-system */
 335                         bsdtar->option_warn_links = 1;
 336                         break;
 337                 case OPTION_LZMA:
 338                         if (bsdtar->create_compression != '\0')
 339                                 lafe_errc(1, 0,
 340                                     "Can't specify both -%c and -%c", opt,
 341                                     bsdtar->create_compression);
 342                         bsdtar->create_compression = opt;
 343                         break;
 344                 case 'm': /* SUSv2 */
 345                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_TIME;
 346                         break;
 347                 case 'n': /* GNU tar */
 348                         bsdtar->option_no_subdirs = 1;
 349                         break;
 350                 /*
 351                  * Selecting files by time:
 352                  *    --newer-?time='date' Only files newer than 'date'
 353                  *    --newer-?time-than='file' Only files newer than time
 354                  *         on specified file (useful for incremental backups)
 355                  * TODO: Add corresponding "older" options to reverse these.
 356                  */
 357                 case OPTION_NEWER_CTIME: /* GNU tar */
 358                         bsdtar->newer_ctime_sec = get_date(now, bsdtar->optarg);
 359                         break;
 360                 case OPTION_NEWER_CTIME_THAN:
 361                         {
 362                                 struct stat st;
 363                                 if (stat(bsdtar->optarg, &st) != 0)
 364                                         lafe_errc(1, 0,
 365                                             "Can't open file %s", bsdtar->optarg);
 366                                 bsdtar->newer_ctime_sec = st.st_ctime;
 367                                 bsdtar->newer_ctime_nsec =
 368                                     ARCHIVE_STAT_CTIME_NANOS(&st);
 369                         }
 370                         break;
 371                 case OPTION_NEWER_MTIME: /* GNU tar */
 372                         bsdtar->newer_mtime_sec = get_date(now, bsdtar->optarg);
 373                         break;
 374                 case OPTION_NEWER_MTIME_THAN:
 375                         {
 376                                 struct stat st;
 377                                 if (stat(bsdtar->optarg, &st) != 0)
 378                                         lafe_errc(1, 0,
 379                                             "Can't open file %s", bsdtar->optarg);
 380                                 bsdtar->newer_mtime_sec = st.st_mtime;
 381                                 bsdtar->newer_mtime_nsec =
 382                                     ARCHIVE_STAT_MTIME_NANOS(&st);
 383                         }
 384                         break;
 385                 case OPTION_NODUMP: /* star */
 386                         bsdtar->option_honor_nodump = 1;
 387                         break;
 388                 case OPTION_NO_SAME_OWNER: /* GNU tar */
 389                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
 390                         break;
 391                 case OPTION_NO_SAME_PERMISSIONS: /* GNU tar */
 392                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_PERM;
 393                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_ACL;
 394                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_XATTR;
 395                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_FFLAGS;
 396                         break;
 397                 case OPTION_NULL: /* GNU tar */
 398                         bsdtar->option_null++;
 399                         break;
 400                 case OPTION_NUMERIC_OWNER: /* GNU tar */
 401                         bsdtar->option_numeric_owner++;
 402                         break;
 403                 case 'O': /* GNU tar */
 404                         bsdtar->option_stdout = 1;
 405                         break;
 406                 case 'o': /* SUSv2 and GNU conflict here, but not fatally */
 407                         option_o = 1; /* Record it and resolve it later. */
 408                         break;
 409                 case OPTION_ONE_FILE_SYSTEM: /* GNU tar */
 410                         bsdtar->option_dont_traverse_mounts = 1;
 411                         break;
 412 #if 0
 413                 /*
 414                  * The common BSD -P option is not necessary, since
 415                  * our default is to archive symlinks, not follow
 416                  * them.  This is convenient, as -P conflicts with GNU
 417                  * tar anyway.
 418                  */
 419                 case 'P': /* BSD convention */
 420                         /* Default behavior, no option necessary. */
 421                         break;
 422 #endif
 423                 case 'P': /* GNU tar */
 424                         bsdtar->extract_flags &= ~SECURITY;
 425                         bsdtar->option_absolute_paths = 1;
 426                         break;
 427                 case 'p': /* GNU tar, star */
 428                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
 429                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
 430                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
 431                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
 432                         break;
 433                 case OPTION_POSIX: /* GNU tar */
 434                         bsdtar->create_format = "pax";
 435                         break;
 436                 case 'q': /* FreeBSD GNU tar --fast-read, NetBSD -q */
 437                         bsdtar->option_fast_read = 1;
 438                         break;
 439                 case 'r': /* SUSv2 */
 440                         set_mode(bsdtar, opt);
 441                         break;
 442                 case 'S': /* NetBSD pax-as-tar */
 443                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_SPARSE;
 444                         break;
 445                 case 's': /* NetBSD pax-as-tar */
 446 #if HAVE_REGEX_H
 447                         add_substitution(bsdtar, bsdtar->optarg);
 448 #else
 449                         lafe_warnc(0,
 450                             "-s is not supported by this version of bsdtar");
 451                         usage();
 452 #endif
 453                         break;
 454                 case OPTION_SAME_OWNER: /* GNU tar */
 455                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
 456                         break;
 457                 case OPTION_STRIP_COMPONENTS: /* GNU tar 1.15 */
 458                         bsdtar->strip_components = atoi(bsdtar->optarg);
 459                         break;
 460                 case 'T': /* GNU tar */
 461                         bsdtar->names_from_file = bsdtar->optarg;
 462                         break;
 463                 case 't': /* SUSv2 */
 464                         set_mode(bsdtar, opt);
 465                         bsdtar->verbose++;
 466                         break;
 467                 case OPTION_TOTALS: /* GNU tar */
 468                         bsdtar->option_totals++;
 469                         break;
 470                 case 'U': /* GNU tar */
 471                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_UNLINK;
 472                         bsdtar->option_unlink_first = 1;
 473                         break;
 474                 case 'u': /* SUSv2 */
 475                         set_mode(bsdtar, opt);
 476                         break;
 477                 case 'v': /* SUSv2 */
 478                         bsdtar->verbose++;
 479                         break;
 480                 case OPTION_VERSION: /* GNU convention */
 481                         version();
 482                         break;
 483 #if 0
 484                 /*
 485                  * The -W longopt feature is handled inside of
 486                  * bsdtar_getopt(), so -W is not available here.
 487                  */
 488                 case 'W': /* Obscure GNU convention. */
 489                         break;
 490 #endif
 491                 case 'w': /* SUSv2 */
 492                         bsdtar->option_interactive = 1;
 493                         break;
 494                 case 'X': /* GNU tar */
 495                         if (lafe_exclude_from_file(&bsdtar->matching, bsdtar->optarg))
 496                                 lafe_errc(1, 0,
 497                                     "failed to process exclusions from file %s",
 498                                     bsdtar->optarg);
 499                         break;
 500                 case 'x': /* SUSv2 */
 501                         set_mode(bsdtar, opt);
 502                         break;
 503                 case 'y': /* FreeBSD version of GNU tar */
 504                         if (bsdtar->create_compression != '\0')
 505                                 lafe_errc(1, 0,
 506                                     "Can't specify both -%c and -%c", opt,
 507                                     bsdtar->create_compression);
 508                         bsdtar->create_compression = opt;
 509                         break;
 510                 case 'Z': /* GNU tar */
 511                         if (bsdtar->create_compression != '\0')
 512                                 lafe_errc(1, 0,
 513                                     "Can't specify both -%c and -%c", opt,
 514                                     bsdtar->create_compression);
 515                         bsdtar->create_compression = opt;
 516                         break;
 517                 case 'z': /* GNU tar, star, many others */
 518                         if (bsdtar->create_compression != '\0')
 519                                 lafe_errc(1, 0,
 520                                     "Can't specify both -%c and -%c", opt,
 521                                     bsdtar->create_compression);
 522                         bsdtar->create_compression = opt;
 523                         break;
 524                 case OPTION_USE_COMPRESS_PROGRAM:
 525                         bsdtar->compress_program = bsdtar->optarg;
 526                         break;
 527                 default:
 528                         usage();
 529                 }
 530         }
 531
 532         /*
 533          * Sanity-check options.
 534          */
 535
 536         /* If no "real" mode was specified, treat -h as --help. */
 537         if ((bsdtar->mode == '\0') && possible_help_request) {
 538                 long_help();
 539                 exit(0);
 540         }
 541
 542         /* Otherwise, a mode is required. */
 543         if (bsdtar->mode == '\0')
 544                 lafe_errc(1, 0,
 545                     "Must specify one of -c, -r, -t, -u, -x");
 546
 547         /* Check boolean options only permitted in certain modes. */
 548         if (bsdtar->option_dont_traverse_mounts)
 549                 only_mode(bsdtar, "--one-file-system", "cru");
 550         if (bsdtar->option_fast_read)
 551                 only_mode(bsdtar, "--fast-read", "xt");
 552         if (bsdtar->option_honor_nodump)
 553                 only_mode(bsdtar, "--nodump", "cru");
 554         if (option_o > 0) {
 555                 switch (bsdtar->mode) {
 556                 case 'c':
 557                         /*
 558                          * In GNU tar, -o means "old format."  The
 559                          * "ustar" format is the closest thing
 560                          * supported by libarchive.
 561                          */
 562                         bsdtar->create_format = "ustar";
 563                         /* TODO: bsdtar->create_format = "v7"; */
 564                         break;
 565                 case 'x':
 566                         /* POSIX-compatible behavior. */
 567                         bsdtar->option_no_owner = 1;
 568                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
 569                         break;
 570                 default:
 571                         only_mode(bsdtar, "-o", "xc");
 572                         break;
 573                 }
 574         }
 575         if (bsdtar->option_no_subdirs)
 576                 only_mode(bsdtar, "-n", "cru");
 577         if (bsdtar->option_stdout)
 578                 only_mode(bsdtar, "-O", "xt");
 579         if (bsdtar->option_unlink_first)
 580                 only_mode(bsdtar, "-U", "x");
 581         if (bsdtar->option_warn_links)
 582                 only_mode(bsdtar, "--check-links", "cr");
 583
 584         /* Check other parameters only permitted in certain modes. */
 585         if (bsdtar->create_compression != '\0') {
 586                 strcpy(buff, "-?");
 587                 buff[1] = bsdtar->create_compression;
 588                 only_mode(bsdtar, buff, "cxt");
 589         }
 590         if (bsdtar->create_format != NULL)
 591                 only_mode(bsdtar, "--format", "cru");
 592         if (bsdtar->symlink_mode != '\0') {
 593                 strcpy(buff, "-?");
 594                 buff[1] = bsdtar->symlink_mode;
 595                 only_mode(bsdtar, buff, "cru");
 596         }
 597         if (bsdtar->strip_components != 0)
 598                 only_mode(bsdtar, "--strip-components", "xt");
 599
 600         switch(bsdtar->mode) {
 601         case 'c':
 602                 tar_mode_c(bsdtar);
 603                 break;
 604         case 'r':
 605                 tar_mode_r(bsdtar);
 606                 break;
 607         case 't':
 608                 tar_mode_t(bsdtar);
 609                 break;
 610         case 'u':
 611                 tar_mode_u(bsdtar);
 612                 break;
 613         case 'x':
 614                 tar_mode_x(bsdtar);
 615                 break;
 616         }
 617
 618         lafe_cleanup_exclusions(&bsdtar->matching);
 619 #if HAVE_REGEX_H
 620         cleanup_substitution(bsdtar);
 621 #endif
 622
 623         if (bsdtar->return_value != 0)
 624                 lafe_warnc(0,
 625                     "Error exit delayed from previous errors.");
 626         return (bsdtar->return_value);
 627 }
 628
 629 static void
 630 set_mode(struct bsdtar *bsdtar, char opt)
 631 {
 632         if (bsdtar->mode != '\0' && bsdtar->mode != opt)
 633                 lafe_errc(1, 0,
 634                     "Can't specify both -%c and -%c", opt, bsdtar->mode);
 635         bsdtar->mode = opt;
 636 }
 637
 638 /*
 639  * Verify that the mode is correct.
 640  */
 641 static void
 642 only_mode(struct bsdtar *bsdtar, const char *opt, const char *valid_modes)
 643 {
 644         if (strchr(valid_modes, bsdtar->mode) == NULL)
 645                 lafe_errc(1, 0,
 646                     "Option %s is not permitted in mode -%c",
 647                     opt, bsdtar->mode);
 648 }
 649
 650
 651 void
 652 usage(void)
 653 {
 654         const char      *p;
 655
 656         p = lafe_progname;
 657
 658         fprintf(stderr, "Usage:\n");
 659         fprintf(stderr, "  List:    %s -tf <archive-filename>\n", p);
 660         fprintf(stderr, "  Extract: %s -xf <archive-filename>\n", p);
 661         fprintf(stderr, "  Create:  %s -cf <archive-filename> [filenames...]\n", p);
 662         fprintf(stderr, "  Help:    %s --help\n", p);
 663         exit(1);
 664 }
 665
 666 static void
 667 version(void)
 668 {
 669         printf("bsdtar %s - %s\n",
 670             BSDTAR_VERSION_STRING,
 671             archive_version());
 672         exit(0);
 673 }
 674
 675 static const char *long_help_msg =
 676         "First option must be a mode specifier:\n"
 677         "  -c Create  -r Add/Replace  -t List  -u Update  -x Extract\n"
 678         "Common Options:\n"
 679         "  -b #  Use # 512-byte records per I/O block\n"
 680         "  -f <filename>  Location of archive (default " _PATH_DEFTAPE ")\n"
 681         "  -v    Verbose\n"
 682         "  -w    Interactive\n"
 683         "Create: %p -c [options] [<file> | <dir> | @<archive> | -C <dir> ]\n"
 684         "  <file>, <dir>  add these items to archive\n"
 685         "  -z, -j, -J, --lzma  Compress archive with gzip/bzip2/xz/lzma\n"
 686         "  --format {ustar|pax|cpio|shar}  Select archive format\n"
 687         "  --exclude <pattern>  Skip files that match pattern\n"
 688         "  -C <dir>  Change to <dir> before processing remaining files\n"
 689         "  @<archive>  Add entries from <archive> to output\n"
 690         "List: %p -t [options] [<patterns>]\n"
 691         "  <patterns>  If specified, list only entries that match\n"
 692         "Extract: %p -x [options] [<patterns>]\n"
 693         "  <patterns>  If specified, extract only entries that match\n"
 694         "  -k    Keep (don't overwrite) existing files\n"
 695         "  -m    Don't restore modification times\n"
 696         "  -O    Write entries to stdout, don't restore to disk\n"
 697         "  -p    Restore permissions (including ACLs, owner, file flags)\n";
 698
 699
 700 /*
 701  * Note that the word 'bsdtar' will always appear in the first line
 702  * of output.
 703  *
 704  * In particular, /bin/sh scripts that need to test for the presence
 705  * of bsdtar can use the following template:
 706  *
 707  * if (tar --help 2>&1 | grep bsdtar >/dev/null 2>&1 ) then \
 708  *          echo bsdtar; else echo not bsdtar; fi
 709  */
 710 static void
 711 long_help(void)
 712 {
 713         const char      *prog;
 714         const char      *p;
 715
 716         prog = lafe_progname;
 717
 718         fflush(stderr);
 719
 720         p = (strcmp(prog,"bsdtar") != 0) ? "(bsdtar)" : "";
 721         printf("%s%s: manipulate archive files\n", prog, p);
 722
 723         for (p = long_help_msg; *p != '\0'; p++) {
 724                 if (*p == '%') {
 725                         if (p[1] == 'p') {
 726                                 fputs(prog, stdout);
 727                                 p++;
 728                         } else
 729                                 putchar('%');
 730                 } else
 731                         putchar(*p);
 732         }
 733         version();
 734 }