contrib/libarchive-1.3.1/tar/bsdtar.c

   1 /*-
   2  * Copyright (c) 2003-2005 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  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "bsdtar_platform.h"
  28 __FBSDID("$FreeBSD: src/usr.bin/tar/bsdtar.c,v 1.67 2006/03/21 17:03:51 kientzle Exp $");
  29
  30 #include <sys/param.h>
  31 #include <sys/stat.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34 #ifdef HAVE_GETOPT_LONG
  35 #include <getopt.h>
  36 #else
  37 struct option {
  38         const char *name;
  39         int has_arg;
  40         int *flag;
  41         int val;
  42 };
  43 #define no_argument 0
  44 #define required_argument 1
  45 #endif
  46 #ifdef HAVE_LANGINFO_H
  47 #include <langinfo.h>
  48 #endif
  49 #include <locale.h>
  50 #ifdef HAVE_PATHS_H
  51 #include <paths.h>
  52 #endif
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <time.h>
  57 #include <unistd.h>
  58 #if HAVE_ZLIB_H
  59 #include <zlib.h>
  60 #endif
  61
  62 #include "bsdtar.h"
  63
  64 #ifdef __linux
  65 #define _PATH_DEFTAPE "/dev/st0"
  66 #endif
  67
  68 #ifndef _PATH_DEFTAPE
  69 #define _PATH_DEFTAPE "/dev/tape"
  70 #endif
  71
  72 /* External function to parse a date/time string (from getdate.y) */
  73 time_t get_date(const char *);
  74
  75 static int               bsdtar_getopt(struct bsdtar *, const char *optstring,
  76     const struct option **poption);
  77 static void              long_help(struct bsdtar *);
  78 static void              only_mode(struct bsdtar *, const char *opt,
  79                              const char *valid);
  80 static char **           rewrite_argv(struct bsdtar *,
  81                              int *argc, char ** src_argv,
  82                              const char *optstring);
  83 static void              set_mode(struct bsdtar *, char opt);
  84 static void              version(void);
  85
  86 /*
  87  * The leading '+' here forces the GNU version of getopt() (as well as
  88  * both the GNU and BSD versions of getopt_long) to stop at the first
  89  * non-option.  Otherwise, GNU getopt() permutes the arguments and
  90  * screws up -C processing.
  91  */
  92 static const char *tar_opts = "+Bb:C:cF:f:HhI:jkLlmnOoPprtT:UuvW:wX:xyZz";
  93
  94 /*
  95  * Most of these long options are deliberately not documented.  They
  96  * are provided only to make life easier for people who also use GNU tar.
  97  * The only long options documented in the manual page are the ones
  98  * with no corresponding short option, such as --exclude, --nodump,
  99  * and --fast-read.
 100  *
 101  * On systems that lack getopt_long, long options can be specified
 102  * using -W longopt and -W longopt=value, e.g. "-W nodump" is the same
 103  * as "--nodump" and "-W exclude=pattern" is the same as "--exclude
 104  * pattern".  This does not rely the GNU getopt() "W;" extension, so
 105  * should work correctly on any system with a POSIX-compliant getopt().
 106  */
 107
 108 /* Fake short equivalents for long options that otherwise lack them. */
 109 enum {
 110         OPTION_CHECK_LINKS=1,
 111         OPTION_EXCLUDE,
 112         OPTION_FAST_READ,
 113         OPTION_FORMAT,
 114         OPTION_HELP,
 115         OPTION_INCLUDE,
 116         OPTION_NEWER_CTIME,
 117         OPTION_NEWER_CTIME_THAN,
 118         OPTION_NEWER_MTIME,
 119         OPTION_NEWER_MTIME_THAN,
 120         OPTION_NODUMP,
 121         OPTION_NO_SAME_PERMISSIONS,
 122         OPTION_NULL,
 123         OPTION_ONE_FILE_SYSTEM,
 124         OPTION_STRIP_COMPONENTS,
 125         OPTION_TOTALS,
 126         OPTION_VERSION
 127 };
 128
 129 /*
 130  * If you add anything, be very careful to keep this list properly
 131  * sorted, as the -W logic relies on it.
 132  */
 133 static const struct option tar_longopts[] = {
 134         { "absolute-paths",     no_argument,       NULL, 'P' },
 135         { "append",             no_argument,       NULL, 'r' },
 136         { "block-size",         required_argument, NULL, 'b' },
 137         { "bunzip2",            no_argument,       NULL, 'j' },
 138         { "bzip",               no_argument,       NULL, 'j' },
 139         { "bzip2",              no_argument,       NULL, 'j' },
 140         { "cd",                 required_argument, NULL, 'C' },
 141         { "check-links",        no_argument,       NULL, OPTION_CHECK_LINKS },
 142         { "confirmation",       no_argument,       NULL, 'w' },
 143         { "create",             no_argument,       NULL, 'c' },
 144         { "dereference",        no_argument,       NULL, 'L' },
 145         { "directory",          required_argument, NULL, 'C' },
 146         { "exclude",            required_argument, NULL, OPTION_EXCLUDE },
 147         { "exclude-from",       required_argument, NULL, 'X' },
 148         { "extract",            no_argument,       NULL, 'x' },
 149         { "fast-read",          no_argument,       NULL, OPTION_FAST_READ },
 150         { "file",               required_argument, NULL, 'f' },
 151         { "files-from",         required_argument, NULL, 'T' },
 152         { "format",             required_argument, NULL, OPTION_FORMAT },
 153         { "gunzip",             no_argument,       NULL, 'z' },
 154         { "gzip",               no_argument,       NULL, 'z' },
 155         { "help",               no_argument,       NULL, OPTION_HELP },
 156         { "include",            required_argument, NULL, OPTION_INCLUDE },
 157         { "interactive",        no_argument,       NULL, 'w' },
 158         { "keep-old-files",     no_argument,       NULL, 'k' },
 159         { "list",               no_argument,       NULL, 't' },
 160         { "modification-time",  no_argument,       NULL, 'm' },
 161         { "newer",              required_argument, NULL, OPTION_NEWER_CTIME },
 162         { "newer-ctime",        required_argument, NULL, OPTION_NEWER_CTIME },
 163         { "newer-ctime-than",   required_argument, NULL, OPTION_NEWER_CTIME_THAN },
 164         { "newer-mtime",        required_argument, NULL, OPTION_NEWER_MTIME },
 165         { "newer-mtime-than",   required_argument, NULL, OPTION_NEWER_MTIME_THAN },
 166         { "newer-than",         required_argument, NULL, OPTION_NEWER_CTIME_THAN },
 167         { "nodump",             no_argument,       NULL, OPTION_NODUMP },
 168         { "norecurse",          no_argument,       NULL, 'n' },
 169         { "no-recursion",       no_argument,       NULL, 'n' },
 170         { "no-same-owner",      no_argument,       NULL, 'o' },
 171         { "no-same-permissions",no_argument,       NULL, OPTION_NO_SAME_PERMISSIONS },
 172         { "null",               no_argument,       NULL, OPTION_NULL },
 173         { "one-file-system",    no_argument,       NULL, OPTION_ONE_FILE_SYSTEM },
 174         { "preserve-permissions", no_argument,     NULL, 'p' },
 175         { "read-full-blocks",   no_argument,       NULL, 'B' },
 176         { "same-permissions",   no_argument,       NULL, 'p' },
 177         { "strip-components",   required_argument, NULL, OPTION_STRIP_COMPONENTS },
 178         { "to-stdout",          no_argument,       NULL, 'O' },
 179         { "totals",             no_argument,       NULL, OPTION_TOTALS },
 180         { "unlink",             no_argument,       NULL, 'U' },
 181         { "unlink-first",       no_argument,       NULL, 'U' },
 182         { "update",             no_argument,       NULL, 'u' },
 183         { "verbose",            no_argument,       NULL, 'v' },
 184         { "version",            no_argument,       NULL, OPTION_VERSION },
 185         { NULL, 0, NULL, 0 }
 186 };
 187
 188 int
 189 main(int argc, char **argv)
 190 {
 191         struct bsdtar           *bsdtar, bsdtar_storage;
 192         const struct option     *option;
 193         int                      opt, t;
 194         char                     option_o;
 195         char                     possible_help_request;
 196         char                     buff[16];
 197
 198         /*
 199          * Use a pointer for consistency, but stack-allocated storage
 200          * for ease of cleanup.
 201          */
 202         bsdtar = &bsdtar_storage;
 203         memset(bsdtar, 0, sizeof(*bsdtar));
 204         bsdtar->fd = -1; /* Mark as "unused" */
 205         option_o = 0;
 206
 207         /* Need bsdtar->progname before calling bsdtar_warnc. */
 208         if (*argv == NULL)
 209                 bsdtar->progname = "bsdtar";
 210         else {
 211                 bsdtar->progname = strrchr(*argv, '/');
 212                 if (bsdtar->progname != NULL)
 213                         bsdtar->progname++;
 214                 else
 215                         bsdtar->progname = *argv;
 216         }
 217
 218         if (setlocale(LC_ALL, "") == NULL)
 219                 bsdtar_warnc(bsdtar, 0, "Failed to set default locale");
 220 #if defined(HAVE_NL_LANGINFO) && defined(HAVE_D_MD_ORDER)
 221         bsdtar->day_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 222 #endif
 223         possible_help_request = 0;
 224
 225         /* Look up uid of current user for future reference */
 226         bsdtar->user_uid = geteuid();
 227
 228         /* Default: open tape drive. */
 229         bsdtar->filename = getenv("TAPE");
 230         if (bsdtar->filename == NULL)
 231                 bsdtar->filename = _PATH_DEFTAPE;
 232
 233         /* Default: preserve mod time on extract */
 234         bsdtar->extract_flags = ARCHIVE_EXTRACT_TIME;
 235
 236         /* Default for root user: preserve ownership on extract. */
 237         if (bsdtar->user_uid == 0)
 238                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
 239
 240         /* Rewrite traditional-style tar arguments, if used. */
 241         argv = rewrite_argv(bsdtar, &argc, argv, tar_opts);
 242
 243         bsdtar->argv = argv;
 244         bsdtar->argc = argc;
 245
 246         /* Process all remaining arguments now. */
 247         while ((opt = bsdtar_getopt(bsdtar, tar_opts, &option)) != -1) {
 248                 switch (opt) {
 249                 case 'B': /* GNU tar */
 250                         /* libarchive doesn't need this; just ignore it. */
 251                         break;
 252                 case 'b': /* SUSv2 */
 253                         t = atoi(optarg);
 254                         if (t <= 0 || t > 1024)
 255                                 bsdtar_errc(bsdtar, 1, 0,
 256                                     "Argument to -b is out of range (1..1024)");
 257                         bsdtar->bytes_per_block = 512 * t;
 258                         break;
 259                 case 'C': /* GNU tar */
 260                         set_chdir(bsdtar, optarg);
 261                         break;
 262                 case 'c': /* SUSv2 */
 263                         set_mode(bsdtar, opt);
 264                         break;
 265                 case OPTION_CHECK_LINKS: /* GNU tar */
 266                         bsdtar->option_warn_links = 1;
 267                         break;
 268                 case OPTION_EXCLUDE: /* GNU tar */
 269                         if (exclude(bsdtar, optarg))
 270                                 bsdtar_errc(bsdtar, 1, 0,
 271                                     "Couldn't exclude %s\n", optarg);
 272                         break;
 273                 case OPTION_FORMAT:
 274                         bsdtar->create_format = optarg;
 275                         break;
 276                 case 'f': /* SUSv2 */
 277                         bsdtar->filename = optarg;
 278                         if (strcmp(bsdtar->filename, "-") == 0)
 279                                 bsdtar->filename = NULL;
 280                         break;
 281                 case OPTION_FAST_READ: /* GNU tar */
 282                         bsdtar->option_fast_read = 1;
 283                         break;
 284                 case 'H': /* BSD convention */
 285                         bsdtar->symlink_mode = 'H';
 286                         break;
 287                 case 'h': /* Linux Standards Base, gtar; synonym for -L */
 288                         bsdtar->symlink_mode = 'L';
 289                         /* Hack: -h by itself is the "help" command. */
 290                         possible_help_request = 1;
 291                         break;
 292                 case OPTION_HELP:
 293                         long_help(bsdtar);
 294                         exit(0);
 295                         break;
 296                 case 'I': /* GNU tar */
 297                         bsdtar->names_from_file = optarg;
 298                         break;
 299                 case OPTION_INCLUDE:
 300                         if (include(bsdtar, optarg))
 301                                 bsdtar_errc(bsdtar, 1, 0,
 302                                     "Failed to add %s to inclusion list",
 303                                     optarg);
 304                         break;
 305                 case 'j': /* GNU tar */
 306 #if HAVE_LIBBZ2
 307                         if (bsdtar->create_compression != '\0')
 308                                 bsdtar_errc(bsdtar, 1, 0,
 309                                     "Can't specify both -%c and -%c", opt,
 310                                     bsdtar->create_compression);
 311                         bsdtar->create_compression = opt;
 312 #else
 313                         bsdtar_warnc(bsdtar, 0, "-j compression not supported by this version of bsdtar");
 314                         usage(bsdtar);
 315 #endif
 316                         break;
 317                 case 'k': /* GNU tar */
 318                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE;
 319                         break;
 320                 case 'L': /* BSD convention */
 321                         bsdtar->symlink_mode = 'L';
 322                         break;
 323                 case 'l': /* SUSv2 and GNU conflict badly here */
 324                         if (getenv("POSIXLY_CORRECT") != NULL) {
 325                                 /* User has asked for POSIX/SUS behavior. */
 326                                 bsdtar->option_warn_links = 1;
 327                         } else {
 328                                 fprintf(stderr,
 329 "Error: -l has different behaviors in different tar programs.\n");
 330                                 fprintf(stderr,
 331 "  For the GNU behavior, use --one-file-system instead.\n");
 332                                 fprintf(stderr,
 333 "  For the POSIX behavior, use --check-links instead.\n");
 334                                 usage(bsdtar);
 335                         }
 336                         break;
 337                 case 'm': /* SUSv2 */
 338                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_TIME;
 339                         break;
 340                 case 'n': /* GNU tar */
 341                         bsdtar->option_no_subdirs = 1;
 342                         break;
 343                 case OPTION_NEWER_CTIME: /* GNU tar */
 344                         bsdtar->newer_ctime_sec = get_date(optarg);
 345                         break;
 346                 case OPTION_NEWER_CTIME_THAN:
 347                         {
 348                                 struct stat st;
 349                                 if (stat(optarg, &st) != 0)
 350                                         bsdtar_errc(bsdtar, 1, 0,
 351                                             "Can't open file %s", optarg);
 352                                 bsdtar->newer_ctime_sec = st.st_ctime;
 353                                 bsdtar->newer_ctime_nsec =
 354                                     ARCHIVE_STAT_CTIME_NANOS(&st);
 355                         }
 356                         break;
 357                 case OPTION_NEWER_MTIME: /* GNU tar */
 358                         bsdtar->newer_mtime_sec = get_date(optarg);
 359                         break;
 360                 case OPTION_NEWER_MTIME_THAN:
 361                         {
 362                                 struct stat st;
 363                                 if (stat(optarg, &st) != 0)
 364                                         bsdtar_errc(bsdtar, 1, 0,
 365                                             "Can't open file %s", optarg);
 366                                 bsdtar->newer_mtime_sec = st.st_mtime;
 367                                 bsdtar->newer_mtime_nsec =
 368                                     ARCHIVE_STAT_MTIME_NANOS(&st);
 369                         }
 370                         break;
 371                 case OPTION_NODUMP: /* star */
 372                         bsdtar->option_honor_nodump = 1;
 373                         break;
 374                 case OPTION_NO_SAME_PERMISSIONS: /* GNU tar */
 375                         /*
 376                          * This is always the default in FreeBSD's
 377                          * version of GNU tar; it's also the default
 378                          * behavior for bsdtar, so treat the
 379                          * command-line option as a no-op.
 380                          */
 381                         break;
 382                 case OPTION_NULL: /* GNU tar */
 383                         bsdtar->option_null++;
 384                         break;
 385                 case 'O': /* GNU tar */
 386                         bsdtar->option_stdout = 1;
 387                         break;
 388                 case 'o': /* SUSv2 and GNU conflict here */
 389                         option_o = 1; /* Record it and resolve it later. */
 390                         break;
 391                 case OPTION_ONE_FILE_SYSTEM: /* -l in GNU tar */
 392                         bsdtar->option_dont_traverse_mounts = 1;
 393                         break;
 394 #if 0
 395                 /*
 396                  * The common BSD -P option is not necessary, since
 397                  * our default is to archive symlinks, not follow
 398                  * them.  This is convenient, as -P conflicts with GNU
 399                  * tar anyway.
 400                  */
 401                 case 'P': /* BSD convention */
 402                         /* Default behavior, no option necessary. */
 403                         break;
 404 #endif
 405                 case 'P': /* GNU tar */
 406                         bsdtar->option_absolute_paths = 1;
 407                         break;
 408                 case 'p': /* GNU tar, star */
 409                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
 410                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
 411                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
 412                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
 413                         break;
 414                 case 'r': /* SUSv2 */
 415                         set_mode(bsdtar, opt);
 416                         break;
 417                 case OPTION_STRIP_COMPONENTS: /* GNU tar 1.15 */
 418                         bsdtar->strip_components = atoi(optarg);
 419                         break;
 420                 case 'T': /* GNU tar */
 421                         bsdtar->names_from_file = optarg;
 422                         break;
 423                 case 't': /* SUSv2 */
 424                         set_mode(bsdtar, opt);
 425                         bsdtar->verbose++;
 426                         break;
 427                 case OPTION_TOTALS: /* GNU tar */
 428                         bsdtar->option_totals++;
 429                         break;
 430                 case 'U': /* GNU tar */
 431                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_UNLINK;
 432                         bsdtar->option_unlink_first = 1;
 433                         break;
 434                 case 'u': /* SUSv2 */
 435                         set_mode(bsdtar, opt);
 436                         break;
 437                 case 'v': /* SUSv2 */
 438                         bsdtar->verbose++;
 439                         break;
 440                 case OPTION_VERSION:
 441                         version();
 442                         break;
 443                 case 'w': /* SUSv2 */
 444                         bsdtar->option_interactive = 1;
 445                         break;
 446                 case 'X': /* GNU tar */
 447                         if (exclude_from_file(bsdtar, optarg))
 448                                 bsdtar_errc(bsdtar, 1, 0,
 449                                     "failed to process exclusions from file %s",
 450                                     optarg);
 451                         break;
 452                 case 'x': /* SUSv2 */
 453                         set_mode(bsdtar, opt);
 454                         break;
 455                 case 'y': /* FreeBSD version of GNU tar */
 456 #if HAVE_LIBBZ2
 457                         if (bsdtar->create_compression != '\0')
 458                                 bsdtar_errc(bsdtar, 1, 0,
 459                                     "Can't specify both -%c and -%c", opt,
 460                                     bsdtar->create_compression);
 461                         bsdtar->create_compression = opt;
 462 #else
 463                         bsdtar_warnc(bsdtar, 0, "-y compression not supported by this version of bsdtar");
 464                         usage(bsdtar);
 465 #endif
 466                         break;
 467                 case 'Z': /* GNU tar */
 468                         if (bsdtar->create_compression != '\0')
 469                                 bsdtar_errc(bsdtar, 1, 0,
 470                                     "Can't specify both -%c and -%c", opt,
 471                                     bsdtar->create_compression);
 472                         bsdtar->create_compression = opt;
 473                         break;
 474                 case 'z': /* GNU tar, star, many others */
 475 #if HAVE_LIBZ
 476                         if (bsdtar->create_compression != '\0')
 477                                 bsdtar_errc(bsdtar, 1, 0,
 478                                     "Can't specify both -%c and -%c", opt,
 479                                     bsdtar->create_compression);
 480                         bsdtar->create_compression = opt;
 481 #else
 482                         bsdtar_warnc(bsdtar, 0, "-z compression not supported by this version of bsdtar");
 483                         usage(bsdtar);
 484 #endif
 485                         break;
 486                 default:
 487                         usage(bsdtar);
 488                 }
 489         }
 490
 491         /*
 492          * Sanity-check options.
 493          */
 494         if ((bsdtar->mode == '\0') && possible_help_request) {
 495                 long_help(bsdtar);
 496                 exit(0);
 497         }
 498
 499         if (bsdtar->mode == '\0')
 500                 bsdtar_errc(bsdtar, 1, 0,
 501                     "Must specify one of -c, -r, -t, -u, -x");
 502
 503         /* Check boolean options only permitted in certain modes. */
 504         if (bsdtar->option_dont_traverse_mounts)
 505                 only_mode(bsdtar, "-X", "cru");
 506         if (bsdtar->option_fast_read)
 507                 only_mode(bsdtar, "--fast-read", "xt");
 508         if (bsdtar->option_honor_nodump)
 509                 only_mode(bsdtar, "--nodump", "cru");
 510         if (option_o > 0) {
 511                 switch (bsdtar->mode) {
 512                 case 'c':
 513                         /*
 514                          * In GNU tar, -o means "old format."  The
 515                          * "ustar" format is the closest thing
 516                          * supported by libarchive.
 517                          */
 518                         bsdtar->create_format = "ustar";
 519                         /* TODO: bsdtar->create_format = "v7"; */
 520                         break;
 521                 case 'x':
 522                         /* POSIX-compatible behavior. */
 523                         bsdtar->option_no_owner = 1;
 524                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
 525                         break;
 526                 default:
 527                         only_mode(bsdtar, "-o", "xc");
 528                         break;
 529                 }
 530         }
 531         if (bsdtar->option_no_subdirs)
 532                 only_mode(bsdtar, "-n", "cru");
 533         if (bsdtar->option_stdout)
 534                 only_mode(bsdtar, "-O", "xt");
 535         if (bsdtar->option_warn_links)
 536                 only_mode(bsdtar, "--check-links", "cr");
 537
 538         /* Check other parameters only permitted in certain modes. */
 539         if (bsdtar->create_compression == 'Z' && bsdtar->mode == 'c') {
 540                 bsdtar_warnc(bsdtar, 0, ".Z compression not supported");
 541                 usage(bsdtar);
 542         }
 543         if (bsdtar->create_compression != '\0') {
 544                 strcpy(buff, "-?");
 545                 buff[1] = bsdtar->create_compression;
 546                 only_mode(bsdtar, buff, "cxt");
 547         }
 548         if (bsdtar->create_format != NULL)
 549                 only_mode(bsdtar, "--format", "c");
 550         if (bsdtar->symlink_mode != '\0') {
 551                 strcpy(buff, "-?");
 552                 buff[1] = bsdtar->symlink_mode;
 553                 only_mode(bsdtar, buff, "cru");
 554         }
 555
 556         bsdtar->argc -= optind;
 557         bsdtar->argv += optind;
 558
 559         switch(bsdtar->mode) {
 560         case 'c':
 561                 tar_mode_c(bsdtar);
 562                 break;
 563         case 'r':
 564                 tar_mode_r(bsdtar);
 565                 break;
 566         case 't':
 567                 tar_mode_t(bsdtar);
 568                 break;
 569         case 'u':
 570                 tar_mode_u(bsdtar);
 571                 break;
 572         case 'x':
 573                 tar_mode_x(bsdtar);
 574                 break;
 575         }
 576
 577         cleanup_exclusions(bsdtar);
 578         return (bsdtar->return_value);
 579 }
 580
 581 static void
 582 set_mode(struct bsdtar *bsdtar, char opt)
 583 {
 584         if (bsdtar->mode != '\0' && bsdtar->mode != opt)
 585                 bsdtar_errc(bsdtar, 1, 0,
 586                     "Can't specify both -%c and -%c", opt, bsdtar->mode);
 587         bsdtar->mode = opt;
 588 }
 589
 590 /*
 591  * Verify that the mode is correct.
 592  */
 593 static void
 594 only_mode(struct bsdtar *bsdtar, const char *opt, const char *valid_modes)
 595 {
 596         if (strchr(valid_modes, bsdtar->mode) == NULL)
 597                 bsdtar_errc(bsdtar, 1, 0,
 598                     "Option %s is not permitted in mode -%c",
 599                     opt, bsdtar->mode);
 600 }
 601
 602
 603 /*-
 604  * Convert traditional tar arguments into new-style.
 605  * For example,
 606  *     tar tvfb file.tar 32 --exclude FOO
 607  * will be converted to
 608  *     tar -t -v -f file.tar -b 32 --exclude FOO
 609  *
 610  * This requires building a new argv array.  The initial bundled word
 611  * gets expanded into a new string that looks like "-t\0-v\0-f\0-b\0".
 612  * The new argv array has pointers into this string intermingled with
 613  * pointers to the existing arguments.  Arguments are moved to
 614  * immediately follow their options.
 615  *
 616  * The optstring argument here is the same one passed to getopt(3).
 617  * It is used to determine which option letters have trailing arguments.
 618  */
 619 char **
 620 rewrite_argv(struct bsdtar *bsdtar, int *argc, char **src_argv,
 621     const char *optstring)
 622 {
 623         char **new_argv, **dest_argv;
 624         const char *p;
 625         char *src, *dest;
 626
 627         if (src_argv[0] == NULL ||
 628             src_argv[1] == NULL || src_argv[1][0] == '-')
 629                 return (src_argv);
 630
 631         *argc += strlen(src_argv[1]) - 1;
 632         new_argv = malloc((*argc + 1) * sizeof(new_argv[0]));
 633         if (new_argv == NULL)
 634                 bsdtar_errc(bsdtar, 1, errno, "No Memory");
 635
 636         dest_argv = new_argv;
 637         *dest_argv++ = *src_argv++;
 638
 639         dest = malloc(strlen(*src_argv) * 3);
 640         if (dest == NULL)
 641                 bsdtar_errc(bsdtar, 1, errno, "No memory");
 642         for (src = *src_argv++; *src != '\0'; src++) {
 643                 *dest_argv++ = dest;
 644                 *dest++ = '-';
 645                 *dest++ = *src;
 646                 *dest++ = '\0';
 647                 /* If option takes an argument, insert that into the list. */
 648                 for (p = optstring; p != NULL && *p != '\0'; p++) {
 649                         if (*p != *src)
 650                                 continue;
 651                         if (p[1] != ':')        /* No arg required, done. */
 652                                 break;
 653                         if (*src_argv == NULL)  /* No arg available? Error. */
 654                                 bsdtar_errc(bsdtar, 1, 0,
 655                                     "Option %c requires an argument",
 656                                     *src);
 657                         *dest_argv++ = *src_argv++;
 658                         break;
 659                 }
 660         }
 661
 662         /* Copy remaining arguments, including trailing NULL. */
 663         while ((*dest_argv++ = *src_argv++) != NULL)
 664                 ;
 665
 666         return (new_argv);
 667 }
 668
 669 void
 670 usage(struct bsdtar *bsdtar)
 671 {
 672         const char      *p;
 673
 674         p = bsdtar->progname;
 675
 676         fprintf(stderr, "Usage:\n");
 677         fprintf(stderr, "  List:    %s -tf <archive-filename>\n", p);
 678         fprintf(stderr, "  Extract: %s -xf <archive-filename>\n", p);
 679         fprintf(stderr, "  Create:  %s -cf <archive-filename> [filenames...]\n", p);
 680 #ifdef HAVE_GETOPT_LONG
 681         fprintf(stderr, "  Help:    %s --help\n", p);
 682 #else
 683         fprintf(stderr, "  Help:    %s -h\n", p);
 684 #endif
 685         exit(1);
 686 }
 687
 688 static void
 689 version(void)
 690 {
 691         printf("bsdtar %s - %s\n", PACKAGE_VERSION, archive_version());
 692         exit(1);
 693 }
 694
 695 static const char *long_help_msg =
 696         "First option must be a mode specifier:\n"
 697         "  -c Create  -r Add/Replace  -t List  -u Update  -x Extract\n"
 698         "Common Options:\n"
 699         "  -b #  Use # 512-byte records per I/O block\n"
 700         "  -f <filename>  Location of archive (default " _PATH_DEFTAPE ")\n"
 701         "  -v    Verbose\n"
 702         "  -w    Interactive\n"
 703         "Create: %p -c [options] [<file> | <dir> | @<archive> | -C <dir> ]\n"
 704         "  <file>, <dir>  add these items to archive\n"
 705         "  -z, -j  Compress archive with gzip/bzip2\n"
 706         "  --format {ustar|pax|cpio|shar}  Select archive format\n"
 707 #ifdef HAVE_GETOPT_LONG
 708         "  --exclude <pattern>  Skip files that match pattern\n"
 709 #else
 710         "  -W exclude=<pattern>  Skip files that match pattern\n"
 711 #endif
 712         "  -C <dir>  Change to <dir> before processing remaining files\n"
 713         "  @<archive>  Add entries from <archive> to output\n"
 714         "List: %p -t [options] [<patterns>]\n"
 715         "  <patterns>  If specified, list only entries that match\n"
 716         "Extract: %p -x [options] [<patterns>]\n"
 717         "  <patterns>  If specified, extract only entries that match\n"
 718         "  -k    Keep (don't overwrite) existing files\n"
 719         "  -m    Don't restore modification times\n"
 720         "  -O    Write entries to stdout, don't restore to disk\n"
 721         "  -p    Restore permissions (including ACLs, owner, file flags)\n";
 722
 723
 724 /*
 725  * Note that the word 'bsdtar' will always appear in the first line
 726  * of output.
 727  *
 728  * In particular, /bin/sh scripts that need to test for the presence
 729  * of bsdtar can use the following template:
 730  *
 731  * if (tar --help 2>&1 | grep bsdtar >/dev/null 2>&1 ) then \
 732  *          echo bsdtar; else echo not bsdtar; fi
 733  */
 734 static void
 735 long_help(struct bsdtar *bsdtar)
 736 {
 737         const char      *prog;
 738         const char      *p;
 739
 740         prog = bsdtar->progname;
 741
 742         fflush(stderr);
 743
 744         p = (strcmp(prog,"bsdtar") != 0) ? "(bsdtar)" : "";
 745         printf("%s%s: manipulate archive files\n", prog, p);
 746
 747         for (p = long_help_msg; *p != '\0'; p++) {
 748                 if (*p == '%') {
 749                         if (p[1] == 'p') {
 750                                 fputs(prog, stdout);
 751                                 p++;
 752                         } else
 753                                 putchar('%');
 754                 } else
 755                         putchar(*p);
 756         }
 757         version();
 758 }
 759
 760 static int
 761 bsdtar_getopt(struct bsdtar *bsdtar, const char *optstring,
 762     const struct option **poption)
 763 {
 764         char *p, *q;
 765         const struct option *option;
 766         int opt;
 767         int option_index;
 768         size_t option_length;
 769
 770         option_index = -1;
 771         *poption = NULL;
 772
 773 #ifdef HAVE_GETOPT_LONG
 774         opt = getopt_long(bsdtar->argc, bsdtar->argv, optstring,
 775             tar_longopts, &option_index);
 776         if (option_index > -1)
 777                 *poption = tar_longopts + option_index;
 778 #else
 779         opt = getopt(bsdtar->argc, bsdtar->argv, optstring);
 780 #endif
 781
 782         /* Support long options through -W longopt=value */
 783         if (opt == 'W') {
 784                 p = optarg;
 785                 q = strchr(optarg, '=');
 786                 if (q != NULL) {
 787                         option_length = (size_t)(q - p);
 788                         optarg = q + 1;
 789                 } else {
 790                         option_length = strlen(p);
 791                         optarg = NULL;
 792                 }
 793                 option = tar_longopts;
 794                 while (option->name != NULL &&
 795                     (strlen(option->name) < option_length ||
 796                     strncmp(p, option->name, option_length) != 0 )) {
 797                         option++;
 798                 }
 799
 800                 if (option->name != NULL) {
 801                         *poption = option;
 802                         opt = option->val;
 803
 804                         /* If the first match was exact, we're done. */
 805                         if (strncmp(p, option->name, strlen(option->name)) == 0) {
 806                                 while (option->name != NULL)
 807                                         option++;
 808                         } else {
 809                                 /* Check if there's another match. */
 810                                 option++;
 811                                 while (option->name != NULL &&
 812                                     (strlen(option->name) < option_length ||
 813                                     strncmp(p, option->name, option_length) != 0)) {
 814                                         option++;
 815                                 }
 816                         }
 817                         if (option->name != NULL)
 818                                 bsdtar_errc(bsdtar, 1, 0,
 819                                     "Ambiguous option %s "
 820                                     "(matches both %s and %s)",
 821                                     p, (*poption)->name, option->name);
 822
 823                 } else {
 824                         opt = '?';
 825                         /* TODO: Set up a fake 'struct option' for
 826                          * error reporting... ? ? ? */
 827                 }
 828         }
 829
 830         return (opt);
 831 }