contrib/bsdtar/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 1.63 2005/04/17 19:43:37 kientzle Exp $");
  29
  30 #include <sys/param.h>
  31 #include <sys/stat.h>
  32 #include <archive.h>
  33 #include <archive_entry.h>
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #ifdef HAVE_GETOPT_LONG
  37 #include <getopt.h>
  38 #else
  39 struct option {
  40         const char *name;
  41         int has_arg;
  42         int *flag;
  43         int val;
  44 };
  45 #define no_argument 0
  46 #define required_argument 1
  47 #endif
  48 #ifdef HAVE_LANGINFO_H
  49 #include <langinfo.h>
  50 #endif
  51 #include <locale.h>
  52 #ifdef HAVE_PATHS_H
  53 #include <paths.h>
  54 #endif
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <time.h>
  59 #include <unistd.h>
  60 #if HAVE_ZLIB_H
  61 #include <zlib.h>
  62 #endif
  63
  64 #include "bsdtar.h"
  65
  66 #ifdef __linux
  67 #define _PATH_DEFTAPE "/dev/st0"
  68 #endif
  69
  70 #ifndef _PATH_DEFTAPE
  71 #define _PATH_DEFTAPE "/dev/tape"
  72 #endif
  73
  74 /* External function to parse a date/time string (from getdate.y) */
  75 time_t get_date(const char *);
  76
  77 static int               bsdtar_getopt(struct bsdtar *, const char *optstring,
  78     const struct option **poption);
  79 static void              long_help(struct bsdtar *);
  80 static void              only_mode(struct bsdtar *, const char *opt,
  81                              const char *valid);
  82 static char **           rewrite_argv(struct bsdtar *,
  83                              int *argc, char ** src_argv,
  84                              const char *optstring);
  85 static void              set_mode(struct bsdtar *, char opt);
  86 static void              version(void);
  87
  88 /*
  89  * The leading '+' here forces the GNU version of getopt() (as well as
  90  * both the GNU and BSD versions of getopt_long) to stop at the first
  91  * non-option.  Otherwise, GNU getopt() permutes the arguments and
  92  * screws up -C processing.
  93  */
  94 static const char *tar_opts = "+Bb:C:cF:f:HhI:jkLlmnOoPprtT:UuvW:wX:xyZz";
  95
  96 /*
  97  * Most of these long options are deliberately not documented.  They
  98  * are provided only to make life easier for people who also use GNU tar.
  99  * The only long options documented in the manual page are the ones
 100  * with no corresponding short option, such as --exclude, --nodump,
 101  * and --fast-read.
 102  *
 103  * On systems that lack getopt_long, long options can be specified
 104  * using -W longopt and -W longopt=value, e.g. "-W nodump" is the same
 105  * as "--nodump" and "-W exclude=pattern" is the same as "--exclude
 106  * pattern".  This does not rely the GNU getopt() "W;" extension, so
 107  * should work correctly on any system with a POSIX-compliant getopt().
 108  */
 109
 110 /* Fake short equivalents for long options that otherwise lack them. */
 111 enum {
 112         OPTION_CHECK_LINKS=1,
 113         OPTION_EXCLUDE,
 114         OPTION_FAST_READ,
 115         OPTION_FORMAT,
 116         OPTION_HELP,
 117         OPTION_INCLUDE,
 118         OPTION_NEWER_CTIME,
 119         OPTION_NEWER_CTIME_THAN,
 120         OPTION_NEWER_MTIME,
 121         OPTION_NEWER_MTIME_THAN,
 122         OPTION_NODUMP,
 123         OPTION_NO_SAME_PERMISSIONS,
 124         OPTION_NULL,
 125         OPTION_ONE_FILE_SYSTEM,
 126         OPTION_STRIP_COMPONENTS,
 127         OPTION_TOTALS,
 128         OPTION_VERSION
 129 };
 130
 131 /*
 132  * If you add anything, be very careful to keep this list properly
 133  * sorted, as the -W logic relies on it.
 134  */
 135 static const struct option tar_longopts[] = {
 136         { "absolute-paths",     no_argument,       NULL, 'P' },
 137         { "append",             no_argument,       NULL, 'r' },
 138         { "block-size",         required_argument, NULL, 'b' },
 139         { "bunzip2",            no_argument,       NULL, 'j' },
 140         { "bzip",               no_argument,       NULL, 'j' },
 141         { "bzip2",              no_argument,       NULL, 'j' },
 142         { "cd",                 required_argument, NULL, 'C' },
 143         { "check-links",        no_argument,       NULL, OPTION_CHECK_LINKS },
 144         { "confirmation",       no_argument,       NULL, 'w' },
 145         { "create",             no_argument,       NULL, 'c' },
 146         { "dereference",        no_argument,       NULL, 'L' },
 147         { "directory",          required_argument, NULL, 'C' },
 148         { "exclude",            required_argument, NULL, OPTION_EXCLUDE },
 149         { "exclude-from",       required_argument, NULL, 'X' },
 150         { "extract",            no_argument,       NULL, 'x' },
 151         { "fast-read",          no_argument,       NULL, OPTION_FAST_READ },
 152         { "file",               required_argument, NULL, 'f' },
 153         { "files-from",         required_argument, NULL, 'T' },
 154         { "format",             required_argument, NULL, OPTION_FORMAT },
 155         { "gunzip",             no_argument,       NULL, 'z' },
 156         { "gzip",               no_argument,       NULL, 'z' },
 157         { "help",               no_argument,       NULL, OPTION_HELP },
 158         { "include",            required_argument, NULL, OPTION_INCLUDE },
 159         { "interactive",        no_argument,       NULL, 'w' },
 160         { "keep-old-files",     no_argument,       NULL, 'k' },
 161         { "list",               no_argument,       NULL, 't' },
 162         { "modification-time",  no_argument,       NULL, 'm' },
 163         { "newer",              required_argument, NULL, OPTION_NEWER_CTIME },
 164         { "newer-ctime",        required_argument, NULL, OPTION_NEWER_CTIME },
 165         { "newer-ctime-than",   required_argument, NULL, OPTION_NEWER_CTIME_THAN },
 166         { "newer-mtime",        required_argument, NULL, OPTION_NEWER_MTIME },
 167         { "newer-mtime-than",   required_argument, NULL, OPTION_NEWER_MTIME_THAN },
 168         { "newer-than",         required_argument, NULL, OPTION_NEWER_CTIME_THAN },
 169         { "nodump",             no_argument,       NULL, OPTION_NODUMP },
 170         { "norecurse",          no_argument,       NULL, 'n' },
 171         { "no-recursion",       no_argument,       NULL, 'n' },
 172         { "no-same-owner",      no_argument,       NULL, 'o' },
 173         { "no-same-permissions",no_argument,       NULL, OPTION_NO_SAME_PERMISSIONS },
 174         { "null",               no_argument,       NULL, OPTION_NULL },
 175         { "one-file-system",    no_argument,       NULL, OPTION_ONE_FILE_SYSTEM },
 176         { "preserve-permissions", no_argument,     NULL, 'p' },
 177         { "read-full-blocks",   no_argument,       NULL, 'B' },
 178         { "same-permissions",   no_argument,       NULL, 'p' },
 179         { "strip-components",   required_argument, NULL, OPTION_STRIP_COMPONENTS },
 180         { "to-stdout",          no_argument,       NULL, 'O' },
 181         { "totals",             no_argument,       NULL, OPTION_TOTALS },
 182         { "unlink",             no_argument,       NULL, 'U' },
 183         { "unlink-first",       no_argument,       NULL, 'U' },
 184         { "update",             no_argument,       NULL, 'u' },
 185         { "verbose",            no_argument,       NULL, 'v' },
 186         { "version",            no_argument,       NULL, OPTION_VERSION },
 187         { NULL, 0, NULL, 0 }
 188 };
 189
 190 int
 191 main(int argc, char **argv)
 192 {
 193         struct bsdtar           *bsdtar, bsdtar_storage;
 194         const struct option     *option;
 195         int                      opt, t;
 196         char                     option_o;
 197         char                     possible_help_request;
 198         char                     buff[16];
 199
 200         /*
 201          * Use a pointer for consistency, but stack-allocated storage
 202          * for ease of cleanup.
 203          */
 204         bsdtar = &bsdtar_storage;
 205         memset(bsdtar, 0, sizeof(*bsdtar));
 206         bsdtar->fd = -1; /* Mark as "unused" */
 207         option_o = 0;
 208
 209         if (setlocale(LC_ALL, "") == NULL)
 210                 bsdtar_warnc(bsdtar, 0, "Failed to set default locale");
 211 #if defined(HAVE_NL_LANGINFO) && defined(HAVE_D_MD_ORDER)
 212         bsdtar->day_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 213 #endif
 214         possible_help_request = 0;
 215
 216         /* Look up uid of current user for future reference */
 217         bsdtar->user_uid = geteuid();
 218
 219         /* Default: open tape drive. */
 220         bsdtar->filename = getenv("TAPE");
 221         if (bsdtar->filename == NULL)
 222                 bsdtar->filename = _PATH_DEFTAPE;
 223
 224         /* Default: preserve mod time on extract */
 225         bsdtar->extract_flags = ARCHIVE_EXTRACT_TIME;
 226
 227         if (bsdtar->user_uid == 0)
 228                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
 229
 230         if (*argv == NULL)
 231                 bsdtar->progname = "bsdtar";
 232         else {
 233                 bsdtar->progname = strrchr(*argv, '/');
 234                 if (bsdtar->progname != NULL)
 235                         bsdtar->progname++;
 236                 else
 237                         bsdtar->progname = *argv;
 238         }
 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_FFLAGS;
 412                         break;
 413                 case 'r': /* SUSv2 */
 414                         set_mode(bsdtar, opt);
 415                         break;
 416                 case OPTION_STRIP_COMPONENTS: /* GNU tar 1.15 */
 417                         bsdtar->strip_components = atoi(optarg);
 418                         break;
 419                 case 'T': /* GNU tar */
 420                         bsdtar->names_from_file = optarg;
 421                         break;
 422                 case 't': /* SUSv2 */
 423                         set_mode(bsdtar, opt);
 424                         bsdtar->verbose++;
 425                         break;
 426                 case OPTION_TOTALS: /* GNU tar */
 427                         bsdtar->option_totals++;
 428                         break;
 429                 case 'U': /* GNU tar */
 430                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_UNLINK;
 431                         bsdtar->option_unlink_first = 1;
 432                         break;
 433                 case 'u': /* SUSv2 */
 434                         set_mode(bsdtar, opt);
 435                         break;
 436                 case 'v': /* SUSv2 */
 437                         bsdtar->verbose++;
 438                         break;
 439                 case OPTION_VERSION:
 440                         version();
 441                         break;
 442                 case 'w': /* SUSv2 */
 443                         bsdtar->option_interactive = 1;
 444                         break;
 445                 case 'X': /* GNU tar */
 446                         if (exclude_from_file(bsdtar, optarg))
 447                                 bsdtar_errc(bsdtar, 1, 0,
 448                                     "failed to process exclusions from file %s",
 449                                     optarg);
 450                         break;
 451                 case 'x': /* SUSv2 */
 452                         set_mode(bsdtar, opt);
 453                         break;
 454                 case 'y': /* FreeBSD version of GNU tar */
 455 #if HAVE_LIBBZ2
 456                         if (bsdtar->create_compression != '\0')
 457                                 bsdtar_errc(bsdtar, 1, 0,
 458                                     "Can't specify both -%c and -%c", opt,
 459                                     bsdtar->create_compression);
 460                         bsdtar->create_compression = opt;
 461 #else
 462                         bsdtar_warnc(bsdtar, 0, "-y compression not supported by this version of bsdtar");
 463                         usage(bsdtar);
 464 #endif
 465                         break;
 466                 case 'Z': /* GNU tar */
 467                         if (bsdtar->create_compression != '\0')
 468                                 bsdtar_errc(bsdtar, 1, 0,
 469                                     "Can't specify both -%c and -%c", opt,
 470                                     bsdtar->create_compression);
 471                         bsdtar->create_compression = opt;
 472                         break;
 473                 case 'z': /* GNU tar, star, many others */
 474 #if HAVE_LIBZ
 475                         if (bsdtar->create_compression != '\0')
 476                                 bsdtar_errc(bsdtar, 1, 0,
 477                                     "Can't specify both -%c and -%c", opt,
 478                                     bsdtar->create_compression);
 479                         bsdtar->create_compression = opt;
 480 #else
 481                         bsdtar_warnc(bsdtar, 0, "-z compression not supported by this version of bsdtar");
 482                         usage(bsdtar);
 483 #endif
 484                         break;
 485                 default:
 486                         usage(bsdtar);
 487                 }
 488         }
 489
 490         /*
 491          * Sanity-check options.
 492          */
 493         if ((bsdtar->mode == '\0') && possible_help_request) {
 494                 long_help(bsdtar);
 495                 exit(0);
 496         }
 497
 498         if (bsdtar->mode == '\0')
 499                 bsdtar_errc(bsdtar, 1, 0,
 500                     "Must specify one of -c, -r, -t, -u, -x");
 501
 502         /* Check boolean options only permitted in certain modes. */
 503         if (bsdtar->option_dont_traverse_mounts)
 504                 only_mode(bsdtar, "-X", "cru");
 505         if (bsdtar->option_fast_read)
 506                 only_mode(bsdtar, "--fast-read", "xt");
 507         if (bsdtar->option_honor_nodump)
 508                 only_mode(bsdtar, "--nodump", "cru");
 509         if (option_o > 0) {
 510                 switch (bsdtar->mode) {
 511                 case 'c':
 512                         /*
 513                          * In GNU tar, -o means "old format."  The
 514                          * "ustar" format is the closest thing
 515                          * supported by libarchive.
 516                          */
 517                         bsdtar->create_format = "ustar";
 518                         /* TODO: bsdtar->create_format = "v7"; */
 519                         break;
 520                 case 'x':
 521                         /* POSIX-compatible behavior. */
 522                         bsdtar->option_no_owner = 1;
 523                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
 524                         break;
 525                 default:
 526                         only_mode(bsdtar, "-o", "xc");
 527                         break;
 528                 }
 529         }
 530         if (bsdtar->option_no_subdirs)
 531                 only_mode(bsdtar, "-n", "cru");
 532         if (bsdtar->option_stdout)
 533                 only_mode(bsdtar, "-O", "xt");
 534         if (bsdtar->option_warn_links)
 535                 only_mode(bsdtar, "--check-links", "cr");
 536
 537         /* Check other parameters only permitted in certain modes. */
 538         if (bsdtar->create_compression == 'Z' && bsdtar->mode == 'c') {
 539                 bsdtar_warnc(bsdtar, 0, ".Z compression not supported");
 540                 usage(bsdtar);
 541         }
 542         if (bsdtar->create_compression != '\0') {
 543                 strcpy(buff, "-?");
 544                 buff[1] = bsdtar->create_compression;
 545                 only_mode(bsdtar, buff, "cxt");
 546         }
 547         if (bsdtar->create_format != NULL)
 548                 only_mode(bsdtar, "-F", "c");
 549         if (bsdtar->symlink_mode != '\0') {
 550                 strcpy(buff, "-?");
 551                 buff[1] = bsdtar->symlink_mode;
 552                 only_mode(bsdtar, buff, "cru");
 553         }
 554
 555         bsdtar->argc -= optind;
 556         bsdtar->argv += optind;
 557
 558         switch(bsdtar->mode) {
 559         case 'c':
 560                 tar_mode_c(bsdtar);
 561                 break;
 562         case 'r':
 563                 tar_mode_r(bsdtar);
 564                 break;
 565         case 't':
 566                 tar_mode_t(bsdtar);
 567                 break;
 568         case 'u':
 569                 tar_mode_u(bsdtar);
 570                 break;
 571         case 'x':
 572                 tar_mode_x(bsdtar);
 573                 break;
 574         }
 575
 576         cleanup_exclusions(bsdtar);
 577         return (bsdtar->return_value);
 578 }
 579
 580 static void
 581 set_mode(struct bsdtar *bsdtar, char opt)
 582 {
 583         if (bsdtar->mode != '\0' && bsdtar->mode != opt)
 584                 bsdtar_errc(bsdtar, 1, 0,
 585                     "Can't specify both -%c and -%c", opt, bsdtar->mode);
 586         bsdtar->mode = opt;
 587 }
 588
 589 /*
 590  * Verify that the mode is correct.
 591  */
 592 static void
 593 only_mode(struct bsdtar *bsdtar, const char *opt, const char *valid_modes)
 594 {
 595         if (strchr(valid_modes, bsdtar->mode) == NULL)
 596                 bsdtar_errc(bsdtar, 1, 0,
 597                     "Option %s is not permitted in mode -%c",
 598                     opt, bsdtar->mode);
 599 }
 600
 601
 602 /*-
 603  * Convert traditional tar arguments into new-style.
 604  * For example,
 605  *     tar tvfb file.tar 32 --exclude FOO
 606  * will be converted to
 607  *     tar -t -v -f file.tar -b 32 --exclude FOO
 608  *
 609  * This requires building a new argv array.  The initial bundled word
 610  * gets expanded into a new string that looks like "-t\0-v\0-f\0-b\0".
 611  * The new argv array has pointers into this string intermingled with
 612  * pointers to the existing arguments.  Arguments are moved to
 613  * immediately follow their options.
 614  *
 615  * The optstring argument here is the same one passed to getopt(3).
 616  * It is used to determine which option letters have trailing arguments.
 617  */
 618 char **
 619 rewrite_argv(struct bsdtar *bsdtar, int *argc, char **src_argv,
 620     const char *optstring)
 621 {
 622         char **new_argv, **dest_argv;
 623         const char *p;
 624         char *src, *dest;
 625
 626         if (src_argv[0] == NULL ||
 627             src_argv[1] == NULL || src_argv[1][0] == '-')
 628                 return (src_argv);
 629
 630         *argc += strlen(src_argv[1]) - 1;
 631         new_argv = malloc((*argc + 1) * sizeof(new_argv[0]));
 632         if (new_argv == NULL)
 633                 bsdtar_errc(bsdtar, 1, errno, "No Memory");
 634
 635         dest_argv = new_argv;
 636         *dest_argv++ = *src_argv++;
 637
 638         dest = malloc(strlen(*src_argv) * 3);
 639         if (dest == NULL)
 640                 bsdtar_errc(bsdtar, 1, errno, "No memory");
 641         for (src = *src_argv++; *src != '\0'; src++) {
 642                 *dest_argv++ = dest;
 643                 *dest++ = '-';
 644                 *dest++ = *src;
 645                 *dest++ = '\0';
 646                 /* If option takes an argument, insert that into the list. */
 647                 for (p = optstring; p != NULL && *p != '\0'; p++) {
 648                         if (*p != *src)
 649                                 continue;
 650                         if (p[1] != ':')        /* No arg required, done. */
 651                                 break;
 652                         if (*src_argv == NULL)  /* No arg available? Error. */
 653                                 bsdtar_errc(bsdtar, 1, 0,
 654                                     "Option %c requires an argument",
 655                                     *src);
 656                         *dest_argv++ = *src_argv++;
 657                         break;
 658                 }
 659         }
 660
 661         /* Copy remaining arguments, including trailing NULL. */
 662         while ((*dest_argv++ = *src_argv++) != NULL)
 663                 ;
 664
 665         return (new_argv);
 666 }
 667
 668 void
 669 usage(struct bsdtar *bsdtar)
 670 {
 671         const char      *p;
 672
 673         p = bsdtar->progname;
 674
 675         fprintf(stderr, "Usage:\n");
 676         fprintf(stderr, "  List:    %s -tf <archive-filename>\n", p);
 677         fprintf(stderr, "  Extract: %s -xf <archive-filename>\n", p);
 678         fprintf(stderr, "  Create:  %s -cf <archive-filename> [filenames...]\n", p);
 679 #ifdef HAVE_GETOPT_LONG
 680         fprintf(stderr, "  Help:    %s --help\n", p);
 681 #else
 682         fprintf(stderr, "  Help:    %s -h\n", p);
 683 #endif
 684         exit(1);
 685 }
 686
 687 static void
 688 version(void)
 689 {
 690         printf("bsdtar %s, ", PACKAGE_VERSION);
 691         printf("%s\n", archive_version());
 692         printf("Copyright (C) 2003-2005 Tim Kientzle\n");
 693         exit(1);
 694 }
 695
 696 static const char *long_help_msg =
 697         "First option must be a mode specifier:\n"
 698         "  -c Create  -r Add/Replace  -t List  -u Update  -x Extract\n"
 699         "Common Options:\n"
 700         "  -b #  Use # 512-byte records per I/O block\n"
 701         "  -f <filename>  Location of archive (default " _PATH_DEFTAPE ")\n"
 702         "  -v    Verbose\n"
 703         "  -w    Interactive\n"
 704         "Create: %p -c [options] [<file> | <dir> | @<archive> | -C <dir> ]\n"
 705         "  <file>, <dir>  add these items to archive\n"
 706         "  -z, -j  Compress archive with gzip/bzip2\n"
 707         "  --format {ustar|pax|cpio|shar}  Select archive format\n"
 708 #ifdef HAVE_GETOPT_LONG
 709         "  --exclude <pattern>  Skip files that match pattern\n"
 710 #else
 711         "  -W exclude=<pattern>  Skip files that match pattern\n"
 712 #endif
 713         "  -C <dir>  Change to <dir> before processing remaining files\n"
 714         "  @<archive>  Add entries from <archive> to output\n"
 715         "List: %p -t [options] [<patterns>]\n"
 716         "  <patterns>  If specified, list only entries that match\n"
 717         "Extract: %p -x [options] [<patterns>]\n"
 718         "  <patterns>  If specified, extract only entries that match\n"
 719         "  -k    Keep (don't overwrite) existing files\n"
 720         "  -m    Don't restore modification times\n"
 721         "  -O    Write entries to stdout, don't restore to disk\n"
 722         "  -p    Restore permissions (including ACLs, owner, file flags)\n";
 723
 724
 725 /*
 726  * Note that the word 'bsdtar' will always appear in the first line
 727  * of output.
 728  *
 729  * In particular, /bin/sh scripts that need to test for the presence
 730  * of bsdtar can use the following template:
 731  *
 732  * if (tar --help 2>&1 | grep bsdtar >/dev/null 2>&1 ) then \
 733  *          echo bsdtar; else echo not bsdtar; fi
 734  */
 735 static void
 736 long_help(struct bsdtar *bsdtar)
 737 {
 738         const char      *prog;
 739         const char      *p;
 740
 741         prog = bsdtar->progname;
 742
 743         fflush(stderr);
 744
 745         p = (strcmp(prog,"bsdtar") != 0) ? "(bsdtar)" : "";
 746         printf("%s%s: manipulate archive files\n", prog, p);
 747
 748         for (p = long_help_msg; *p != '\0'; p++) {
 749                 if (*p == '%') {
 750                         if (p[1] == 'p') {
 751                                 fputs(prog, stdout);
 752                                 p++;
 753                         } else
 754                                 putchar('%');
 755                 } else
 756                         putchar(*p);
 757         }
 758         fprintf(stdout, "\n%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
 759         fprintf(stdout, "%s\n", archive_version());
 760 }
 761
 762 static int
 763 bsdtar_getopt(struct bsdtar *bsdtar, const char *optstring,
 764     const struct option **poption)
 765 {
 766         char *p, *q;
 767         const struct option *option;
 768         int opt;
 769         int option_index;
 770         size_t option_length;
 771
 772         option_index = -1;
 773         *poption = NULL;
 774
 775 #ifdef HAVE_GETOPT_LONG
 776         opt = getopt_long(bsdtar->argc, bsdtar->argv, optstring,
 777             tar_longopts, &option_index);
 778         if (option_index > -1)
 779                 *poption = tar_longopts + option_index;
 780 #else
 781         opt = getopt(bsdtar->argc, bsdtar->argv, optstring);
 782 #endif
 783
 784         /* Support long options through -W longopt=value */
 785         if (opt == 'W') {
 786                 p = optarg;
 787                 q = strchr(optarg, '=');
 788                 if (q != NULL) {
 789                         option_length = (size_t)(q - p);
 790                         optarg = q + 1;
 791                 } else {
 792                         option_length = strlen(p);
 793                         optarg = NULL;
 794                 }
 795                 option = tar_longopts;
 796                 while (option->name != NULL &&
 797                     (strlen(option->name) < option_length ||
 798                     strncmp(p, option->name, option_length) != 0 )) {
 799                         option++;
 800                 }
 801
 802                 if (option->name != NULL) {
 803                         *poption = option;
 804                         opt = option->val;
 805
 806                         /* If the first match was exact, we're done. */
 807                         if (strncmp(p, option->name, strlen(option->name)) == 0) {
 808                                 while (option->name != NULL)
 809                                         option++;
 810                         } else {
 811                                 /* Check if there's another match. */
 812                                 option++;
 813                                 while (option->name != NULL &&
 814                                     (strlen(option->name) < option_length ||
 815                                     strncmp(p, option->name, option_length) != 0)) {
 816                                         option++;
 817                                 }
 818                         }
 819                         if (option->name != NULL)
 820                                 bsdtar_errc(bsdtar, 1, 0,
 821                                     "Ambiguous option %s "
 822                                     "(matches both %s and %s)",
 823                                     p, (*poption)->name, option->name);
 824
 825                 } else {
 826                         opt = '?';
 827                         /* TODO: Set up a fake 'struct option' for
 828                          * error reporting... ? ? ? */
 829                 }
 830         }
 831
 832         return (opt);
 833 }