Dogcows Code - chaz/tar/blob - src/tar.c

   1 /* A tar (tape archiver) program.
   2    Copyright (C) 1988, 92,93,94,95,96,97, 1999 Free Software Foundation, Inc.
   3    Written by John Gilmore, starting 1985-08-25.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 2, or (at your option) any later
   8    version.
   9
  10    This program is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  13    Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with this program; if not, write to the Free Software Foundation, Inc.,
  17    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #include "system.h"
  20
  21 #include <getopt.h>
  22
  23 #include <signal.h>
  24 #if ! defined SIGCHLD && defined SIGCLD
  25 # define SIGCHLD SIGCLD
  26 #endif
  27
  28 /* The following causes "common.h" to produce definitions of all the global
  29    variables, rather than just "extern" declarations of them.  GNU tar does
  30    depend on the system loader to preset all GLOBAL variables to neutral (or
  31    zero) values, explicit initialisation is usually not done.  */
  32 #define GLOBAL
  33 #include "common.h"
  34
  35 #include "xstrtol.h"
  36
  37 time_t get_date ();
  38
  39 /* Local declarations.  */
  40
  41 #ifndef DEFAULT_ARCHIVE
  42 # define DEFAULT_ARCHIVE "tar.out"
  43 #endif
  44
  45 #ifndef DEFAULT_BLOCKING
  46 # define DEFAULT_BLOCKING 20
  47 #endif
  48
  49 static void usage PARAMS ((int));
  50 \f
  51 /* Miscellaneous.  */
  52
  53 /*----------------------------------------------.
  54 | Doesn't return if stdin already requested.    |
  55 `----------------------------------------------*/
  56
  57 /* Name of option using stdin.  */
  58 static const char *stdin_used_by = NULL;
  59
  60 void
  61 request_stdin (const char *option)
  62 {
  63   if (stdin_used_by)
  64     USAGE_ERROR ((0, 0, _("Options `-%s' and `-%s' both want standard input"),
  65                   stdin_used_by, option));
  66
  67   stdin_used_by = option;
  68 }
  69
  70 /*--------------------------------------------------------.
  71 | Returns true if and only if the user typed 'y' or 'Y'.  |
  72 `--------------------------------------------------------*/
  73
  74 int
  75 confirm (const char *message_action, const char *message_name)
  76 {
  77   static FILE *confirm_file = NULL;
  78
  79   if (!confirm_file)
  80     {
  81       if (archive == 0 || stdin_used_by)
  82         confirm_file = fopen (TTY_NAME, "r");
  83       else
  84         {
  85           request_stdin ("-w");
  86           confirm_file = stdin;
  87         }
  88
  89       if (!confirm_file)
  90         FATAL_ERROR ((0, 0, _("Cannot read confirmation from user")));
  91     }
  92
  93   fprintf (stdlis, "%s %s?", message_action, message_name);
  94   fflush (stdlis);
  95
  96   {
  97     int reply = getc (confirm_file);
  98     int character;
  99
 100     for (character = reply;
 101          character != '\n' && character != EOF;
 102          character = getc (confirm_file))
 103       continue;
 104     return reply == 'y' || reply == 'Y';
 105   }
 106 }
 107 \f
 108 /* Options.  */
 109
 110 /* For long options that unconditionally set a single flag, we have getopt
 111    do it.  For the others, we share the code for the equivalent short
 112    named option, the name of which is stored in the otherwise-unused `val'
 113    field of the `struct option'; for long options that have no equivalent
 114    short option, we use non-characters as pseudo short options,
 115    starting at CHAR_MAX + 1 and going upwards.  */
 116
 117 enum
 118 {
 119   BACKUP_OPTION = CHAR_MAX + 1,
 120   DELETE_OPTION,
 121   EXCLUDE_OPTION,
 122   GROUP_OPTION,
 123   MODE_OPTION,
 124   NEWER_MTIME_OPTION,
 125   NO_RECURSE_OPTION,
 126   NULL_OPTION,
 127   OWNER_OPTION,
 128   POSIX_OPTION,
 129   PRESERVE_OPTION,
 130   RECORD_SIZE_OPTION,
 131   RSH_COMMAND_OPTION,
 132   SUFFIX_OPTION,
 133   USE_COMPRESS_PROGRAM_OPTION,
 134   VOLNO_FILE_OPTION,
 135
 136   /* Some cleanup is being made in GNU tar long options.  Using old names is
 137      allowed for a while, but will also send a warning to stderr.  Take old
 138      names out in 1.14, or in summer 1997, whichever happens last.  */
 139
 140   OBSOLETE_ABSOLUTE_NAMES,
 141   OBSOLETE_BLOCK_COMPRESS,
 142   OBSOLETE_BLOCKING_FACTOR,
 143   OBSOLETE_BLOCK_NUMBER,
 144   OBSOLETE_READ_FULL_RECORDS,
 145   OBSOLETE_TOUCH,
 146   OBSOLETE_VERSION_CONTROL
 147 };
 148
 149 /* If nonzero, display usage information and exit.  */
 150 static int show_help = 0;
 151
 152 /* If nonzero, print the version on standard output and exit.  */
 153 static int show_version = 0;
 154
 155 struct option long_options[] =
 156 {
 157   {"absolute-names", no_argument, NULL, 'P'},
 158   {"absolute-paths", no_argument, NULL, OBSOLETE_ABSOLUTE_NAMES},
 159   {"after-date", required_argument, NULL, 'N'},
 160   {"append", no_argument, NULL, 'r'},
 161   {"atime-preserve", no_argument, &atime_preserve_option, 1},
 162   {"backup", optional_argument, NULL, BACKUP_OPTION},
 163   {"block-compress", no_argument, NULL, OBSOLETE_BLOCK_COMPRESS},
 164   {"block-number", no_argument, NULL, 'R'},
 165   {"block-size", required_argument, NULL, OBSOLETE_BLOCKING_FACTOR},
 166   {"blocking-factor", required_argument, NULL, 'b'},
 167   {"bzip2", no_argument, NULL, 'y'},
 168   {"catenate", no_argument, NULL, 'A'},
 169   {"checkpoint", no_argument, &checkpoint_option, 1},
 170   {"compare", no_argument, NULL, 'd'},
 171   {"compress", no_argument, NULL, 'Z'},
 172   {"concatenate", no_argument, NULL, 'A'},
 173   {"confirmation", no_argument, NULL, 'w'},
 174   /* FIXME: --selective as a synonym for --confirmation?  */
 175   {"create", no_argument, NULL, 'c'},
 176   {"delete", no_argument, NULL, DELETE_OPTION},
 177   {"dereference", no_argument, NULL, 'h'},
 178   {"diff", no_argument, NULL, 'd'},
 179   {"directory", required_argument, NULL, 'C'},
 180   {"exclude", required_argument, NULL, EXCLUDE_OPTION},
 181   {"exclude-from", required_argument, NULL, 'X'},
 182   {"extract", no_argument, NULL, 'x'},
 183   {"file", required_argument, NULL, 'f'},
 184   {"files-from", required_argument, NULL, 'T'},
 185   {"force-local", no_argument, &force_local_option, 1},
 186   {"get", no_argument, NULL, 'x'},
 187   {"group", required_argument, NULL, GROUP_OPTION},
 188   {"gunzip", no_argument, NULL, 'z'},
 189   {"gzip", no_argument, NULL, 'z'},
 190   {"help", no_argument, &show_help, 1},
 191   {"ignore-failed-read", no_argument, &ignore_failed_read_option, 1},
 192   {"ignore-zeros", no_argument, NULL, 'i'},
 193   /* FIXME: --ignore-end as a new name for --ignore-zeros?  */
 194   {"incremental", no_argument, NULL, 'G'},
 195   {"info-script", required_argument, NULL, 'F'},
 196   {"interactive", no_argument, NULL, 'w'},
 197   {"keep-old-files", no_argument, NULL, 'k'},
 198   {"label", required_argument, NULL, 'V'},
 199   {"list", no_argument, NULL, 't'},
 200   {"listed-incremental", required_argument, NULL, 'g'},
 201   {"mode", required_argument, NULL, MODE_OPTION},
 202   {"modification-time", no_argument, NULL, OBSOLETE_TOUCH},
 203   {"multi-volume", no_argument, NULL, 'M'},
 204   {"new-volume-script", required_argument, NULL, 'F'},
 205   {"newer", required_argument, NULL, 'N'},
 206   {"newer-mtime", required_argument, NULL, NEWER_MTIME_OPTION},
 207   {"null", no_argument, NULL, NULL_OPTION},
 208   {"no-recursion", no_argument, NULL, NO_RECURSE_OPTION},
 209   {"numeric-owner", no_argument, &numeric_owner_option, 1},
 210   {"old-archive", no_argument, NULL, 'o'},
 211   {"one-file-system", no_argument, NULL, 'l'},
 212   {"owner", required_argument, NULL, OWNER_OPTION},
 213   {"portability", no_argument, NULL, 'o'},
 214   {"posix", no_argument, NULL, POSIX_OPTION},
 215   {"preserve", no_argument, NULL, PRESERVE_OPTION},
 216   {"preserve-order", no_argument, NULL, 's'},
 217   {"preserve-permissions", no_argument, NULL, 'p'},
 218   {"recursive-unlink", no_argument, &recursive_unlink_option, 1},
 219   {"read-full-blocks", no_argument, NULL, OBSOLETE_READ_FULL_RECORDS},
 220   {"read-full-records", no_argument, NULL, 'B'},
 221   /* FIXME: --partial-blocks might be a synonym for --read-full-records?  */
 222   {"record-number", no_argument, NULL, OBSOLETE_BLOCK_NUMBER},
 223   {"record-size", required_argument, NULL, RECORD_SIZE_OPTION},
 224   {"remove-files", no_argument, &remove_files_option, 1},
 225   {"rsh-command", required_argument, NULL, RSH_COMMAND_OPTION},
 226   {"same-order", no_argument, NULL, 's'},
 227   {"same-owner", no_argument, &same_owner_option, 1},
 228   {"same-permissions", no_argument, NULL, 'p'},
 229   {"show-omitted-dirs", no_argument, &show_omitted_dirs_option, 1},
 230   {"sparse", no_argument, NULL, 'S'},
 231   {"starting-file", required_argument, NULL, 'K'},
 232   {"suffix", required_argument, NULL, SUFFIX_OPTION},
 233   {"tape-length", required_argument, NULL, 'L'},
 234   {"to-stdout", no_argument, NULL, 'O'},
 235   {"totals", no_argument, &totals_option, 1},
 236   {"touch", no_argument, NULL, 'm'},
 237   {"uncompress", no_argument, NULL, 'Z'},
 238   {"ungzip", no_argument, NULL, 'z'},
 239   {"unlink-first", no_argument, NULL, 'U'},
 240   {"update", no_argument, NULL, 'u'},
 241   {"use-compress-program", required_argument, NULL, USE_COMPRESS_PROGRAM_OPTION},
 242   {"verbose", no_argument, NULL, 'v'},
 243   {"verify", no_argument, NULL, 'W'},
 244   {"version", no_argument, &show_version, 1},
 245   {"version-control", required_argument, NULL, OBSOLETE_VERSION_CONTROL},
 246   {"volno-file", required_argument, NULL, VOLNO_FILE_OPTION},
 247
 248   {0, 0, 0, 0}
 249 };
 250
 251 /*---------------------------------------------.
 252 | Print a usage message and exit with STATUS.  |
 253 `---------------------------------------------*/
 254
 255 static void
 256 usage (int status)
 257 {
 258   if (status != TAREXIT_SUCCESS)
 259     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 260              program_name);
 261   else
 262     {
 263       fputs (_("\
 264 GNU `tar' saves many files together into a single tape or disk archive, and\n\
 265 can restore individual files from the archive.\n"),
 266              stdout);
 267       printf (_("\nUsage: %s [OPTION]... [FILE]...\n"), program_name);
 268       fputs (_("\
 269 \n\
 270 If a long option shows an argument as mandatory, then it is mandatory\n\
 271 for the equivalent short option also.  Similarly for optional arguments.\n"),
 272              stdout);
 273       fputs(_("\
 274 \n\
 275 Main operation mode:\n\
 276   -t, --list              list the contents of an archive\n\
 277   -x, --extract, --get    extract files from an archive\n\
 278   -c, --create            create a new archive\n\
 279   -d, --diff, --compare   find differences between archive and file system\n\
 280   -r, --append            append files to the end of an archive\n\
 281   -u, --update            only append files newer than copy in archive\n\
 282   -A, --catenate          append tar files to an archive\n\
 283       --concatenate       same as -A\n\
 284       --delete            delete from the archive (not on mag tapes!)\n"),
 285             stdout);
 286       fputs (_("\
 287 \n\
 288 Operation modifiers:\n\
 289   -W, --verify               attempt to verify the archive after writing it\n\
 290       --remove-files         remove files after adding them to the archive\n\
 291   -k, --keep-old-files       don't overwrite existing files when extracting\n\
 292   -U, --unlink-first         remove each file prior to extracting over it\n\
 293       --recursive-unlink     empty hierarchies prior to extracting directory\n\
 294   -S, --sparse               handle sparse files efficiently\n\
 295   -O, --to-stdout            extract files to standard output\n\
 296   -G, --incremental          handle old GNU-format incremental backup\n\
 297   -g, --listed-incremental   handle new GNU-format incremental backup\n\
 298       --ignore-failed-read   do not exit with nonzero on unreadable files\n"),
 299              stdout);
 300       fputs (_("\
 301 \n\
 302 Handling of file attributes:\n\
 303       --owner=NAME             force NAME as owner for added files\n\
 304       --group=NAME             force NAME as group for added files\n\
 305       --mode=CHANGES           force (symbolic) mode CHANGES for added files\n\
 306       --atime-preserve         don't change access times on dumped files\n\
 307   -m, --modification-time      don't extract file modified time\n\
 308       --same-owner             try extracting files with the same ownership\n\
 309       --numeric-owner          always use numbers for user/group names\n\
 310   -p, --same-permissions       extract all protection information\n\
 311       --preserve-permissions   same as -p\n\
 312   -s, --same-order             sort names to extract to match archive\n\
 313       --preserve-order         same as -s\n\
 314       --preserve               same as both -p and -s\n"),
 315              stdout);
 316       fputs (_("\
 317 \n\
 318 Device selection and switching:\n\
 319   -f, --file=ARCHIVE             use archive file or device ARCHIVE\n\
 320       --force-local              archive file is local even if has a colon\n\
 321       --rsh-command=COMMAND      use remote COMMAND instead of rsh\n\
 322   -[0-7][lmh]                    specify drive and density\n\
 323   -M, --multi-volume             create/list/extract multi-volume archive\n\
 324   -L, --tape-length=NUM          change tape after writing NUM x 1024 bytes\n\
 325   -F, --info-script=FILE         run script at end of each tape (implies -M)\n\
 326       --new-volume-script=FILE   same as -F FILE\n\
 327       --volno-file=FILE          use/update the volume number in FILE\n"),
 328              stdout);
 329       fputs (_("\
 330 \n\
 331 Device blocking:\n\
 332   -b, --blocking-factor=BLOCKS   BLOCKS x 512 bytes per record\n\
 333       --record-size=SIZE         SIZE bytes per record, multiple of 512\n\
 334   -i, --ignore-zeros             ignore zeroed blocks in archive (means EOF)\n\
 335   -B, --read-full-records        reblock as we read (for 4.2BSD pipes)\n"),
 336              stdout);
 337       fputs (_("\
 338 \n\
 339 Archive format selection:\n\
 340   -V, --label=NAME                   create archive with volume name NAME\n\
 341               PATTERN                at list/extract time, a globbing PATTERN\n\
 342   -o, --old-archive, --portability   write a V7 format archive\n\
 343       --posix                        write a POSIX conformant archive\n\
 344   -y, --bzip2                        filter the archive through bzip2\n\
 345   -z, --gzip, --ungzip               filter the archive through gzip\n\
 346   -Z, --compress, --uncompress       filter the archive through compress\n\
 347       --use-compress-program=PROG    filter through PROG (must accept -d)\n"),
 348              stdout);
 349       fputs (_("\
 350 \n\
 351 Local file selection:\n\
 352   -C, --directory=DIR          change to directory DIR\n\
 353   -T, --files-from=NAME        get names to extract or create from file NAME\n\
 354       --null                   -T reads null-terminated names, disable -C\n\
 355       --exclude=PATTERN        exclude files, given as a globbing PATTERN\n\
 356   -X, --exclude-from=FILE      exclude globbing patterns listed in FILE\n\
 357   -P, --absolute-names         don't strip leading `/'s from file names\n\
 358   -h, --dereference            dump instead the files symlinks point to\n\
 359       --no-recursion           avoid descending automatically in directories\n\
 360   -l, --one-file-system        stay in local file system when creating archive\n\
 361   -K, --starting-file=NAME     begin at file NAME in the archive\n"),
 362              stdout);
 363 #if !MSDOS
 364       fputs (_("\
 365   -N, --newer=DATE             only store files newer than DATE\n\
 366       --newer-mtime            compare date and time when data changed only\n\
 367       --after-date=DATE        same as -N\n"),
 368              stdout);
 369 #endif
 370       fputs (_("\
 371       --backup[=CONTROL]       backup before removal, choose version control\n\
 372       --suffix=SUFFIX          backup before removel, override usual suffix\n"),
 373              stdout);
 374       fputs (_("\
 375 \n\
 376 Informative output:\n\
 377       --help            print this help, then exit\n\
 378       --version         print tar program version number, then exit\n\
 379   -v, --verbose         verbosely list files processed\n\
 380       --checkpoint      print directory names while reading the archive\n\
 381       --totals          print total bytes written while creating archive\n\
 382   -R, --block-number    show block number within archive with each message\n\
 383   -w, --interactive     ask for confirmation for every action\n\
 384       --confirmation    same as -w\n"),
 385              stdout);
 386       fputs (_("\
 387 \n\
 388 The backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
 389 The version control may be set with --backup or VERSION_CONTROL, values are:\n\
 390 \n\
 391   t, numbered     make numbered backups\n\
 392   nil, existing   numbered if numbered backups exist, simple otherwise\n\
 393   never, simple   always make simple backups\n"),
 394              stdout);
 395       printf (_("\
 396 \n\
 397 GNU tar cannot read nor produce `--posix' archives.  If POSIXLY_CORRECT\n\
 398 is set in the environment, GNU extensions are disallowed with `--posix'.\n\
 399 Support for POSIX is only partially implemented, don't count on it yet.\n\
 400 ARCHIVE may be FILE, HOST:FILE or USER@HOST:FILE; and FILE may be a file\n\
 401 or a device.  *This* `tar' defaults to `-f%s -b%d'.\n"),
 402               DEFAULT_ARCHIVE, DEFAULT_BLOCKING);
 403       fputs (_("\
 404 \n\
 405 Report bugs to <bug-tar@gnu.org>.\n"),
 406                stdout);
 407     }
 408   exit (status);
 409 }
 410
 411 /*----------------------------.
 412 | Parse the options for tar.  |
 413 `----------------------------*/
 414
 415 /* Available option letters are DEHIJQY and aejnqy.  Some are reserved:
 416
 417    y  per-file gzip compression
 418    Y  per-block gzip compression */
 419
 420 #define OPTION_STRING \
 421   "-01234567ABC:F:GK:L:MN:OPRST:UV:WX:Zb:cdf:g:hiklmoprstuvwxyz"
 422
 423 static void
 424 set_subcommand_option (enum subcommand subcommand)
 425 {
 426   if (subcommand_option != UNKNOWN_SUBCOMMAND
 427       && subcommand_option != subcommand)
 428     USAGE_ERROR ((0, 0,
 429                   _("You may not specify more than one `-Acdtrux' option")));
 430
 431   subcommand_option = subcommand;
 432 }
 433
 434 static void
 435 set_use_compress_program_option (const char *string)
 436 {
 437   if (use_compress_program_option && strcmp (use_compress_program_option, string) != 0)
 438     USAGE_ERROR ((0, 0, _("Conflicting compression options")));
 439
 440   use_compress_program_option = string;
 441 }
 442
 443 /* Ignore DUMMY (which will always be null in practice), and add
 444    PATTERN to the proper set of patterns to be excluded -- either
 445    patterns with slashes, or patterns without.  */
 446 static void
 447 add_filtered_exclude (struct exclude *dummy, char const *pattern)
 448 {
 449   add_exclude ((strchr (pattern, '/')
 450                 ? excluded_with_slash
 451                 : excluded_without_slash),
 452                pattern);
 453 }
 454
 455 static void
 456 decode_options (int argc, char *const *argv)
 457 {
 458   int optchar;                  /* option letter */
 459   int input_files;              /* number of input files */
 460   const char *backup_suffix_string;
 461   const char *version_control_string = NULL;
 462
 463   /* Set some default option values.  */
 464
 465   subcommand_option = UNKNOWN_SUBCOMMAND;
 466   archive_format = DEFAULT_FORMAT;
 467   blocking_factor = DEFAULT_BLOCKING;
 468   record_size = DEFAULT_BLOCKING * BLOCKSIZE;
 469   excluded_with_slash = new_exclude ();
 470   excluded_without_slash = new_exclude ();
 471   newer_mtime_option = TYPE_MINIMUM (time_t);
 472
 473   owner_option = -1;
 474   group_option = -1;
 475
 476   backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
 477
 478   /* Convert old-style tar call by exploding option element and rearranging
 479      options accordingly.  */
 480
 481   if (argc > 1 && argv[1][0] != '-')
 482     {
 483       int new_argc;             /* argc value for rearranged arguments */
 484       char **new_argv;          /* argv value for rearranged arguments */
 485       char *const *in;          /* cursor into original argv */
 486       char **out;               /* cursor into rearranged argv */
 487       const char *letter;       /* cursor into old option letters */
 488       char buffer[3];           /* constructed option buffer */
 489       const char *cursor;       /* cursor in OPTION_STRING */
 490
 491       /* Initialize a constructed option.  */
 492
 493       buffer[0] = '-';
 494       buffer[2] = '\0';
 495
 496       /* Allocate a new argument array, and copy program name in it.  */
 497
 498       new_argc = argc - 1 + strlen (argv[1]);
 499       new_argv = (char **) xmalloc (new_argc * sizeof (char *));
 500       in = argv;
 501       out = new_argv;
 502       *out++ = *in++;
 503
 504       /* Copy each old letter option as a separate option, and have the
 505          corresponding argument moved next to it.  */
 506
 507       for (letter = *in++; *letter; letter++)
 508         {
 509           buffer[1] = *letter;
 510           *out++ = xstrdup (buffer);
 511           cursor = strchr (OPTION_STRING, *letter);
 512           if (cursor && cursor[1] == ':')
 513             {
 514               if (in < argv + argc)
 515                 *out++ = *in++;
 516               else
 517                 USAGE_ERROR ((0, 0, _("Old option `%c' requires an argument."),
 518                               *letter));
 519             }
 520         }
 521
 522       /* Copy all remaining options.  */
 523
 524       while (in < argv + argc)
 525         *out++ = *in++;
 526
 527       /* Replace the old option list by the new one.  */
 528
 529       argc = new_argc;
 530       argv = new_argv;
 531     }
 532
 533   /* Parse all options and non-options as they appear.  */
 534
 535   input_files = 0;
 536
 537   while (optchar = getopt_long (argc, argv, OPTION_STRING, long_options, NULL),
 538          optchar != EOF)
 539     switch (optchar)
 540       {
 541       case '?':
 542         usage (TAREXIT_FAILURE);
 543
 544       case 0:
 545         break;
 546
 547       case 1:
 548         /* File name or non-parsed option, because of RETURN_IN_ORDER
 549            ordering triggerred by the leading dash in OPTION_STRING.  */
 550
 551         name_add (optarg);
 552         input_files++;
 553         break;
 554
 555       case 'A':
 556         set_subcommand_option (CAT_SUBCOMMAND);
 557         break;
 558
 559       case OBSOLETE_BLOCK_COMPRESS:
 560         WARN ((0, 0, _("Obsolete option, now implied by --blocking-factor")));
 561         break;
 562
 563       case OBSOLETE_BLOCKING_FACTOR:
 564         WARN ((0, 0, _("Obsolete option name replaced by --blocking-factor")));
 565         /* Fall through.  */
 566
 567       case 'b':
 568         {
 569           uintmax_t u;
 570           if (! (xstrtoumax (optarg, (char **) 0, 10, &u, "") == LONGINT_OK
 571                  && u == (blocking_factor = u)
 572                  && 0 < blocking_factor
 573                  && u == (record_size = u * (size_t) BLOCKSIZE) / BLOCKSIZE))
 574             USAGE_ERROR ((0, 0, _("Invalid blocking factor")));
 575         }
 576         break;
 577
 578       case OBSOLETE_READ_FULL_RECORDS:
 579         WARN ((0, 0,
 580                _("Obsolete option name replaced by --read-full-records")));
 581         /* Fall through.  */
 582
 583       case 'B':
 584         /* Try to reblock input records.  For reading 4.2BSD pipes.  */
 585
 586         /* It would surely make sense to exchange -B and -R, but it seems
 587            that -B has been used for a long while in Sun tar ans most
 588            BSD-derived systems.  This is a consequence of the block/record
 589            terminology confusion.  */
 590
 591         read_full_records_option = 1;
 592         break;
 593
 594       case 'c':
 595         set_subcommand_option (CREATE_SUBCOMMAND);
 596         break;
 597
 598       case 'C':
 599         name_add ("-C");
 600         name_add (optarg);
 601         break;
 602
 603       case 'd':
 604         set_subcommand_option (DIFF_SUBCOMMAND);
 605         break;
 606
 607       case 'f':
 608         if (archive_names == allocated_archive_names)
 609           {
 610             allocated_archive_names *= 2;
 611             archive_name_array = (const char **)
 612               xrealloc (archive_name_array,
 613                         sizeof (const char *) * allocated_archive_names);
 614           }
 615         archive_name_array[archive_names++] = optarg;
 616         break;
 617
 618       case 'F':
 619         /* Since -F is only useful with -M, make it implied.  Run this
 620            script at the end of each tape.  */
 621
 622         info_script_option = optarg;
 623         multi_volume_option = 1;
 624         break;
 625
 626       case 'g':
 627         listed_incremental_option = optarg;
 628         /* Fall through.  */
 629
 630       case 'G':
 631         /* We are making an incremental dump (FIXME: are we?); save
 632            directories at the beginning of the archive, and include in each
 633            directory its contents.  */
 634
 635         incremental_option = 1;
 636         break;
 637
 638       case 'h':
 639         /* Follow symbolic links.  */
 640
 641         dereference_option = 1;
 642         break;
 643
 644       case 'i':
 645         /* Ignore zero blocks (eofs).  This can't be the default,
 646            because Unix tar writes two blocks of zeros, then pads out
 647            the record with garbage.  */
 648
 649         ignore_zeros_option = 1;
 650         break;
 651
 652       case 'k':
 653         /* Don't overwrite existing files.  */
 654
 655         keep_old_files_option = 1;
 656         break;
 657
 658       case 'K':
 659         starting_file_option = 1;
 660         addname (optarg);
 661         break;
 662
 663       case 'l':
 664         /* When dumping directories, don't dump files/subdirectories
 665            that are on other filesystems.  */
 666
 667         one_file_system_option = 1;
 668         break;
 669
 670       case 'L':
 671         {
 672           uintmax_t u;
 673           if (xstrtoumax (optarg, (char **) 0, 10, &u, "") != LONG_MAX)
 674             USAGE_ERROR ((0, 0, _("Invalid tape length")));
 675           tape_length_option = 1024 * (tarlong) u;
 676           multi_volume_option = 1;
 677         }
 678         break;
 679
 680       case OBSOLETE_TOUCH:
 681         WARN ((0, 0, _("Obsolete option name replaced by --touch")));
 682         /* Fall through.  */
 683
 684       case 'm':
 685         touch_option = 1;
 686         break;
 687
 688       case 'M':
 689         /* Make multivolume archive: when we can't write any more into
 690            the archive, re-open it, and continue writing.  */
 691
 692         multi_volume_option = 1;
 693         break;
 694
 695 #if !MSDOS
 696       case 'N':
 697         after_date_option = 1;
 698         /* Fall through.  */
 699
 700       case NEWER_MTIME_OPTION:
 701         if (newer_mtime_option != TYPE_MINIMUM (time_t))
 702           USAGE_ERROR ((0, 0, _("More than one threshold date")));
 703
 704         newer_mtime_option = get_date (optarg, (voidstar) 0);
 705         if (newer_mtime_option == (time_t) -1)
 706           USAGE_ERROR ((0, 0, _("Invalid date format `%s'"), optarg));
 707
 708         break;
 709 #endif /* not MSDOS */
 710
 711       case 'o':
 712         if (archive_format == DEFAULT_FORMAT)
 713           archive_format = V7_FORMAT;
 714         else if (archive_format != V7_FORMAT)
 715           USAGE_ERROR ((0, 0, _("Conflicting archive format options")));
 716         break;
 717
 718       case 'O':
 719         to_stdout_option = 1;
 720         break;
 721
 722       case 'p':
 723         same_permissions_option = 1;
 724         break;
 725
 726       case OBSOLETE_ABSOLUTE_NAMES:
 727         WARN ((0, 0, _("Obsolete option name replaced by --absolute-names")));
 728         /* Fall through.  */
 729
 730       case 'P':
 731         absolute_names_option = 1;
 732         break;
 733
 734       case 'r':
 735         set_subcommand_option (APPEND_SUBCOMMAND);
 736         break;
 737
 738       case OBSOLETE_BLOCK_NUMBER:
 739         WARN ((0, 0, _("Obsolete option name replaced by --block-number")));
 740         /* Fall through.  */
 741
 742       case 'R':
 743         /* Print block numbers for debugging bad tar archives.  */
 744
 745         /* It would surely make sense to exchange -B and -R, but it seems
 746            that -B has been used for a long while in Sun tar ans most
 747            BSD-derived systems.  This is a consequence of the block/record
 748            terminology confusion.  */
 749
 750         block_number_option = 1;
 751         break;
 752
 753       case 's':
 754         /* Names to extr are sorted.  */
 755
 756         same_order_option = 1;
 757         break;
 758
 759       case 'S':
 760         sparse_option = 1;
 761         break;
 762
 763       case 't':
 764         set_subcommand_option (LIST_SUBCOMMAND);
 765         verbose_option++;
 766         break;
 767
 768       case 'T':
 769         files_from_option = optarg;
 770         break;
 771
 772       case 'u':
 773         set_subcommand_option (UPDATE_SUBCOMMAND);
 774         break;
 775
 776       case 'U':
 777         unlink_first_option = 1;
 778         break;
 779
 780       case 'v':
 781         verbose_option++;
 782         break;
 783
 784       case 'V':
 785         volume_label_option = optarg;
 786         break;
 787
 788       case 'w':
 789         interactive_option = 1;
 790         break;
 791
 792       case 'W':
 793         verify_option = 1;
 794         break;
 795
 796       case 'x':
 797         set_subcommand_option (EXTRACT_SUBCOMMAND);
 798         break;
 799
 800       case 'X':
 801         if (add_exclude_file (add_filtered_exclude, NULL, optarg, '\n') != 0)
 802           FATAL_ERROR ((0, errno, "%s", optarg));
 803         break;
 804
 805       case 'y':
 806         set_use_compress_program_option ("bzip2");
 807         break;
 808
 809       case 'z':
 810         set_use_compress_program_option ("gzip");
 811         break;
 812
 813       case 'Z':
 814         set_use_compress_program_option ("compress");
 815         break;
 816
 817       case OBSOLETE_VERSION_CONTROL:
 818         WARN ((0, 0, _("Obsolete option name replaced by --backup")));
 819         /* Fall through.  */
 820
 821       case BACKUP_OPTION:
 822         backup_option = 1;
 823         if (optarg)
 824           version_control_string = optarg;
 825         break;
 826
 827       case DELETE_OPTION:
 828         set_subcommand_option (DELETE_SUBCOMMAND);
 829         break;
 830
 831       case EXCLUDE_OPTION:
 832         add_filtered_exclude (NULL, optarg);
 833         break;
 834
 835       case GROUP_OPTION:
 836         if (! (strlen (optarg) < GNAME_FIELD_SIZE
 837                && gname_to_gid (optarg, &group_option)))
 838           {
 839             uintmax_t g;
 840             if (xstrtoumax (optarg, (char **) 0, 10, &g, "") == LONGINT_OK
 841                 && g == (gid_t) g)
 842               group_option = g;
 843             else
 844               FATAL_ERROR ((0, 0, _("Invalid group given on option")));
 845           }
 846         break;
 847
 848       case MODE_OPTION:
 849         mode_option
 850           = mode_compile (optarg,
 851                           MODE_MASK_EQUALS | MODE_MASK_PLUS | MODE_MASK_MINUS);
 852         if (mode_option == MODE_INVALID)
 853           FATAL_ERROR ((0, 0, _("Invalid mode given on option")));
 854         if (mode_option == MODE_MEMORY_EXHAUSTED)
 855           FATAL_ERROR ((0, 0, _("Memory exhausted")));
 856         break;
 857
 858       case NO_RECURSE_OPTION:
 859         no_recurse_option = 1;
 860         break;
 861
 862       case NULL_OPTION:
 863         filename_terminator = '\0';
 864         break;
 865
 866       case OWNER_OPTION:
 867         if (! (strlen (optarg) < UNAME_FIELD_SIZE
 868                && uname_to_uid (optarg, &owner_option)))
 869           {
 870             uintmax_t u;
 871             if (xstrtoumax (optarg, (char **) 0, 10, &u, "") == LONGINT_OK
 872                 && u == (uid_t) u)
 873               owner_option = u;
 874             else
 875               FATAL_ERROR ((0, 0, _("Invalid owner given on option")));
 876           }
 877         break;
 878
 879       case POSIX_OPTION:
 880 #if OLDGNU_COMPATIBILITY
 881         if (archive_format == DEFAULT_FORMAT)
 882           archive_format = GNU_FORMAT;
 883         else if (archive_format != GNU_FORMAT)
 884           USAGE_ERROR ((0, 0, _("Conflicting archive format options")));
 885 #else
 886         if (archive_format == DEFAULT_FORMAT)
 887           archive_format = POSIX_FORMAT;
 888         else if (archive_format != POSIX_FORMAT)
 889           USAGE_ERROR ((0, 0, _("Conflicting archive format options")));
 890 #endif
 891         break;
 892
 893       case PRESERVE_OPTION:
 894         same_permissions_option = 1;
 895         same_order_option = 1;
 896         break;
 897
 898       case RECORD_SIZE_OPTION:
 899         {
 900           uintmax_t u;
 901           if (! (xstrtoumax (optarg, (char **) 0, 10, &u, "") == LONG_MAX
 902                  && u == (size_t) u))
 903             USAGE_ERROR ((0, 0, _("Invalid record size")));
 904           record_size = u;
 905           if (record_size % BLOCKSIZE != 0)
 906             USAGE_ERROR ((0, 0, _("Record size must be a multiple of %d."),
 907                           BLOCKSIZE));
 908           blocking_factor = record_size / BLOCKSIZE;
 909         }
 910         break;
 911
 912       case RSH_COMMAND_OPTION:
 913         rsh_command_option = optarg;
 914         break;
 915
 916       case SUFFIX_OPTION:
 917         backup_option = 1;
 918         backup_suffix_string = optarg;
 919         break;
 920
 921       case VOLNO_FILE_OPTION:
 922         volno_file_option = optarg;
 923         break;
 924
 925       case USE_COMPRESS_PROGRAM_OPTION:
 926         set_use_compress_program_option (optarg);
 927         break;
 928
 929       case '0':
 930       case '1':
 931       case '2':
 932       case '3':
 933       case '4':
 934       case '5':
 935       case '6':
 936       case '7':
 937
 938 #ifdef DEVICE_PREFIX
 939         {
 940           int device = optchar - '0';
 941           int density;
 942           static char buf[sizeof DEVICE_PREFIX + 10];
 943           char *cursor;
 944
 945           density = getopt_long (argc, argv, "lmh", NULL, NULL);
 946           strcpy (buf, DEVICE_PREFIX);
 947           cursor = buf + strlen (buf);
 948
 949 #ifdef DENSITY_LETTER
 950
 951           sprintf (cursor, "%d%c", device, density);
 952
 953 #else /* not DENSITY_LETTER */
 954
 955           switch (density)
 956             {
 957             case 'l':
 958 #ifdef LOW_NUM
 959               device += LOW_NUM;
 960 #endif
 961               break;
 962
 963             case 'm':
 964 #ifdef MID_NUM
 965               device += MID_NUM;
 966 #else
 967               device += 8;
 968 #endif
 969               break;
 970
 971             case 'h':
 972 #ifdef HGH_NUM
 973               device += HGH_NUM;
 974 #else
 975               device += 16;
 976 #endif
 977               break;
 978
 979             default:
 980               usage (TAREXIT_FAILURE);
 981             }
 982           sprintf (cursor, "%d", device);
 983
 984 #endif /* not DENSITY_LETTER */
 985
 986           if (archive_names == allocated_archive_names)
 987             {
 988               allocated_archive_names *= 2;
 989               archive_name_array = (const char **)
 990                 xrealloc (archive_name_array,
 991                           sizeof (const char *) * allocated_archive_names);
 992             }
 993           archive_name_array[archive_names++] = buf;
 994
 995           /* FIXME: How comes this works for many archives when buf is
 996              not xstrdup'ed?  */
 997         }
 998         break;
 999
1000 #else /* not DEVICE_PREFIX */
1001
1002         USAGE_ERROR ((0, 0,
1003                       _("Options `-[0-7][lmh]' not supported by *this* tar")));
1004
1005 #endif /* not DEVICE_PREFIX */
1006       }
1007
1008   /* Process trivial options.  */
1009
1010   if (show_version)
1011     {
1012       printf ("tar (GNU %s) %s\n", PACKAGE, VERSION);
1013       fputs (_("\
1014 \n\
1015 Copyright (C) 1988, 92,93,94,95,96,97,98, 1999 Free Software Foundation, Inc.\n"),
1016              stdout);
1017       fputs (_("\
1018 This is free software; see the source for copying conditions.  There is NO\n\
1019 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"),
1020              stdout);
1021       fputs (_("\
1022 \n\
1023 Written by John Gilmore and Jay Fenlason.\n"),
1024              stdout);
1025       exit (TAREXIT_SUCCESS);
1026     }
1027
1028   if (show_help)
1029     usage (TAREXIT_SUCCESS);
1030
1031   /* Derive option values and check option consistency.  */
1032
1033   if (archive_format == DEFAULT_FORMAT)
1034     {
1035 #if OLDGNU_COMPATIBILITY
1036       archive_format = OLDGNU_FORMAT;
1037 #else
1038       archive_format = GNU_FORMAT;
1039 #endif
1040     }
1041
1042   if (archive_format == GNU_FORMAT && getenv ("POSIXLY_CORRECT"))
1043     archive_format = POSIX_FORMAT;
1044
1045   if ((volume_label_option != NULL
1046        || incremental_option || multi_volume_option || sparse_option)
1047       && archive_format != OLDGNU_FORMAT && archive_format != GNU_FORMAT)
1048     USAGE_ERROR ((0, 0,
1049                   _("GNU features wanted on incompatible archive format")));
1050
1051   if (archive_names == 0)
1052     {
1053       /* If no archive file name given, try TAPE from the environment, or
1054          else, DEFAULT_ARCHIVE from the configuration process.  */
1055
1056       archive_names = 1;
1057       archive_name_array[0] = getenv ("TAPE");
1058       if (archive_name_array[0] == NULL)
1059         archive_name_array[0] = DEFAULT_ARCHIVE;
1060     }
1061
1062   /* Allow multiple archives only with `-M'.  */
1063
1064   if (archive_names > 1 && !multi_volume_option)
1065     USAGE_ERROR ((0, 0,
1066                   _("Multiple archive files requires `-M' option")));
1067
1068   /* If ready to unlink hierarchies, so we are for simpler files.  */
1069   if (recursive_unlink_option)
1070     unlink_first_option = 1;
1071
1072   /* Forbid using -c with no input files whatsoever.  Check that `-f -',
1073      explicit or implied, is used correctly.  */
1074
1075   switch (subcommand_option)
1076     {
1077     case CREATE_SUBCOMMAND:
1078       if (input_files == 0 && !files_from_option)
1079         USAGE_ERROR ((0, 0,
1080                       _("Cowardly refusing to create an empty archive")));
1081       break;
1082
1083     case EXTRACT_SUBCOMMAND:
1084     case LIST_SUBCOMMAND:
1085     case DIFF_SUBCOMMAND:
1086       for (archive_name_cursor = archive_name_array;
1087            archive_name_cursor < archive_name_array + archive_names;
1088            archive_name_cursor++)
1089         if (!strcmp (*archive_name_cursor, "-"))
1090           request_stdin ("-f");
1091       break;
1092
1093     case CAT_SUBCOMMAND:
1094     case UPDATE_SUBCOMMAND:
1095     case APPEND_SUBCOMMAND:
1096       for (archive_name_cursor = archive_name_array;
1097            archive_name_cursor < archive_name_array + archive_names;
1098            archive_name_cursor++)
1099         if (!strcmp (*archive_name_cursor, "-"))
1100           USAGE_ERROR ((0, 0,
1101                         _("Options `-Aru' are incompatible with `-f -'")));
1102
1103     default:
1104       break;
1105     }
1106
1107   archive_name_cursor = archive_name_array;
1108
1109   /* Prepare for generating backup names.  */
1110
1111   if (backup_suffix_string)
1112     simple_backup_suffix = xstrdup (backup_suffix_string);
1113
1114   if (backup_option)
1115     backup_type = xget_version ("--backup", version_control_string);
1116 }
1117 \f
1118 /* Tar proper.  */
1119
1120 /*-----------------------.
1121 | Main routine for tar.  |
1122 `-----------------------*/
1123
1124 int
1125 main (int argc, char *const *argv)
1126 {
1127   program_name = argv[0];
1128   setlocale (LC_ALL, "");
1129   bindtextdomain (PACKAGE, LOCALEDIR);
1130   textdomain (PACKAGE);
1131
1132   exit_status = TAREXIT_SUCCESS;
1133   filename_terminator = '\n';
1134
1135   /* Pre-allocate a few structures.  */
1136
1137   allocated_archive_names = 10;
1138   archive_name_array = (const char **)
1139     xmalloc (sizeof (const char *) * allocated_archive_names);
1140   archive_names = 0;
1141
1142 #ifdef SIGCHLD
1143   /* System V fork+wait does not work if SIGCHLD is ignored.  */
1144   signal (SIGCHLD, SIG_DFL);
1145 #endif
1146
1147   init_names ();
1148
1149   /* Decode options.  */
1150
1151   decode_options (argc, argv);
1152   name_init (argc, argv);
1153
1154   /* Main command execution.  */
1155
1156   if (volno_file_option)
1157     init_volume_number ();
1158
1159   switch (subcommand_option)
1160     {
1161     case UNKNOWN_SUBCOMMAND:
1162       USAGE_ERROR ((0, 0,
1163                     _("You must specify one of the `-Acdtrux' options")));
1164
1165     case CAT_SUBCOMMAND:
1166     case UPDATE_SUBCOMMAND:
1167     case APPEND_SUBCOMMAND:
1168       update_archive ();
1169       break;
1170
1171     case DELETE_SUBCOMMAND:
1172       delete_archive_members ();
1173       break;
1174
1175     case CREATE_SUBCOMMAND:
1176       create_archive ();
1177       name_close ();
1178
1179       if (totals_option)
1180         print_total_written ();
1181       break;
1182
1183     case EXTRACT_SUBCOMMAND:
1184       extr_init ();
1185       read_and (extract_archive);
1186       break;
1187
1188     case LIST_SUBCOMMAND:
1189       read_and (list_archive);
1190       break;
1191
1192     case DIFF_SUBCOMMAND:
1193       diff_init ();
1194       read_and (diff_archive);
1195       break;
1196     }
1197
1198   if (volno_file_option)
1199     closeout_volume_number ();
1200
1201   /* Dispose of allocated memory, and return.  */
1202
1203   free (archive_name_array);
1204   name_term ();
1205
1206   if (exit_status == TAREXIT_FAILURE)
1207     error (0, 0, _("Error exit delayed from previous errors"));
1208   exit (exit_status);
1209 }