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

   1 /* A tar (tape archiver) program.
   2
   3    Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000,
   4    2001, 2003, 2004 Free Software Foundation, Inc.
   5
   6    Written by John Gilmore, starting 1985-08-25.
   7
   8    This program is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by the
  10    Free Software Foundation; either version 2, or (at your option) any later
  11    version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  16    Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License along
  19    with this program; if not, write to the Free Software Foundation, Inc.,
  20    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #include <system.h>
  23
  24 #include <fnmatch.h>
  25 #include <argp.h>
  26
  27 #include <signal.h>
  28 #if ! defined SIGCHLD && defined SIGCLD
  29 # define SIGCHLD SIGCLD
  30 #endif
  31
  32 /* The following causes "common.h" to produce definitions of all the global
  33    variables, rather than just "extern" declarations of them.  GNU tar does
  34    depend on the system loader to preset all GLOBAL variables to neutral (or
  35    zero) values; explicit initialization is usually not done.  */
  36 #define GLOBAL
  37 #include "common.h"
  38
  39 #include <getdate.h>
  40 #include <localedir.h>
  41 #include <rmt.h>
  42 #include <prepargs.h>
  43 #include <quotearg.h>
  44 #include <xstrtol.h>
  45
  46 /* Local declarations.  */
  47
  48 #ifndef DEFAULT_ARCHIVE_FORMAT
  49 # define DEFAULT_ARCHIVE_FORMAT GNU_FORMAT
  50 #endif
  51
  52 #ifndef DEFAULT_ARCHIVE
  53 # define DEFAULT_ARCHIVE "tar.out"
  54 #endif
  55
  56 #ifndef DEFAULT_BLOCKING
  57 # define DEFAULT_BLOCKING 20
  58 #endif
  59
  60 \f
  61 /* Miscellaneous.  */
  62
  63 /* Name of option using stdin.  */
  64 static const char *stdin_used_by;
  65
  66 /* Doesn't return if stdin already requested.  */
  67 void
  68 request_stdin (const char *option)
  69 {
  70   if (stdin_used_by)
  71     USAGE_ERROR ((0, 0, _("Options `-%s' and `-%s' both want standard input"),
  72                   stdin_used_by, option));
  73
  74   stdin_used_by = option;
  75 }
  76
  77 /* Returns true if and only if the user typed 'y' or 'Y'.  */
  78 int
  79 confirm (const char *message_action, const char *message_name)
  80 {
  81   static FILE *confirm_file;
  82   static int confirm_file_EOF;
  83
  84   if (!confirm_file)
  85     {
  86       if (archive == 0 || stdin_used_by)
  87         {
  88           confirm_file = fopen (TTY_NAME, "r");
  89           if (! confirm_file)
  90             open_fatal (TTY_NAME);
  91         }
  92       else
  93         {
  94           request_stdin ("-w");
  95           confirm_file = stdin;
  96         }
  97     }
  98
  99   fprintf (stdlis, "%s %s?", message_action, quote (message_name));
 100   fflush (stdlis);
 101
 102   {
 103     int reply = confirm_file_EOF ? EOF : getc (confirm_file);
 104     int character;
 105
 106     for (character = reply;
 107          character != '\n';
 108          character = getc (confirm_file))
 109       if (character == EOF)
 110         {
 111           confirm_file_EOF = 1;
 112           fputc ('\n', stdlis);
 113           fflush (stdlis);
 114           break;
 115         }
 116     return reply == 'y' || reply == 'Y';
 117   }
 118 }
 119
 120 static struct fmttab {
 121   char const *name;
 122   enum archive_format fmt;
 123 } const fmttab[] = {
 124   { "v7",      V7_FORMAT },
 125   { "oldgnu",  OLDGNU_FORMAT },
 126   { "ustar",   USTAR_FORMAT },
 127   { "posix",   POSIX_FORMAT },
 128 #if 0 /* not fully supported yet */
 129   { "star",    STAR_FORMAT },
 130 #endif
 131   { "gnu",     GNU_FORMAT },
 132   { "pax",     POSIX_FORMAT }, /* An alias for posix */
 133   { NULL,        0 }
 134 };
 135
 136 static void
 137 set_archive_format (char const *name)
 138 {
 139   struct fmttab const *p;
 140
 141   for (p = fmttab; strcmp (p->name, name) != 0; )
 142     if (! (++p)->name)
 143       USAGE_ERROR ((0, 0, _("%s: Invalid archive format"),
 144                     quotearg_colon (name)));
 145
 146   archive_format = p->fmt;
 147 }
 148
 149 static const char *
 150 archive_format_string (enum archive_format fmt)
 151 {
 152   struct fmttab const *p;
 153
 154   for (p = fmttab; p->name; p++)
 155     if (p->fmt == fmt)
 156       return p->name;
 157   return "unknown?";
 158 }
 159
 160 #define FORMAT_MASK(n) (1<<(n))
 161
 162 static void
 163 assert_format(unsigned fmt_mask)
 164 {
 165   if ((FORMAT_MASK(archive_format) & fmt_mask) == 0)
 166     USAGE_ERROR ((0, 0,
 167                   _("GNU features wanted on incompatible archive format")));
 168 }
 169
 170
 171 \f
 172 /* Options.  */
 173
 174 /* For long options that unconditionally set a single flag, we have getopt
 175    do it.  For the others, we share the code for the equivalent short
 176    named option, the name of which is stored in the otherwise-unused `val'
 177    field of the `struct option'; for long options that have no equivalent
 178    short option, we use non-characters as pseudo short options,
 179    starting at CHAR_MAX + 1 and going upwards.  */
 180
 181 enum
 182 {
 183   ANCHORED_OPTION = CHAR_MAX + 1,
 184   ATIME_PRESERVE_OPTION,
 185   BACKUP_OPTION,
 186   CHECKPOINT_OPTION,
 187   CHECK_LINKS_OPTION,
 188   DELETE_OPTION,
 189   EXCLUDE_OPTION,
 190   EXCLUDE_CACHES_OPTION,
 191   FORCE_LOCAL_OPTION,
 192   GROUP_OPTION,
 193   HANG_OPTION,
 194   IGNORE_CASE_OPTION,
 195   IGNORE_COMMAND_ERROR_OPTION,
 196   IGNORE_FAILED_READ_OPTION,
 197   INDEX_FILE_OPTION,
 198   KEEP_NEWER_FILES_OPTION,
 199   LICENSE_OPTION,
 200   MODE_OPTION,
 201   NEWER_MTIME_OPTION,
 202   NO_ANCHORED_OPTION,
 203   NO_IGNORE_CASE_OPTION,
 204   NO_IGNORE_COMMAND_ERROR_OPTION,
 205   NO_OVERWRITE_DIR_OPTION,
 206   NO_RECURSION_OPTION,
 207   NO_SAME_OWNER_OPTION,
 208   NO_SAME_PERMISSIONS_OPTION,
 209   NO_UNQUOTE_OPTION,
 210   NO_WILDCARDS_OPTION,
 211   NO_WILDCARDS_MATCH_SLASH_OPTION,
 212   NULL_OPTION,
 213   NUMERIC_OWNER_OPTION,
 214   OCCURRENCE_OPTION,
 215   OLD_ARCHIVE_OPTION,
 216   ONE_FILE_SYSTEM_OPTION,
 217   OVERWRITE_OPTION,
 218   OWNER_OPTION,
 219   PAX_OPTION,
 220   POSIX_OPTION,
 221   PRESERVE_OPTION,
 222   RECORD_SIZE_OPTION,
 223   RECURSION_OPTION,
 224   RECURSIVE_UNLINK_OPTION,
 225   REMOVE_FILES_OPTION,
 226   RMT_COMMAND_OPTION,
 227   RSH_COMMAND_OPTION,
 228   SAME_OWNER_OPTION,
 229   SHOW_DEFAULTS_OPTION,
 230   SHOW_OMITTED_DIRS_OPTION,
 231   STRIP_COMPONENTS_OPTION,
 232   SUFFIX_OPTION,
 233   TO_COMMAND_OPTION,
 234   TOTALS_OPTION,
 235   UNQUOTE_OPTION,
 236   USAGE_OPTION,
 237   USE_COMPRESS_PROGRAM_OPTION,
 238   UTC_OPTION,
 239   VERSION_OPTION,
 240   VOLNO_FILE_OPTION,
 241   WILDCARDS_OPTION,
 242   WILDCARDS_MATCH_SLASH_OPTION
 243 };
 244
 245 const char *argp_program_version = "tar (" PACKAGE_NAME ") " VERSION;
 246 const char *argp_program_bug_address = "<" PACKAGE_BUGREPORT ">";
 247 static char doc[] = N_("GNU `tar' saves many files together into a single tape or disk archive, and can restore individual files from the archive.\n\
 248 \n\
 249 Examples:\n\
 250   tar -cf archive.tar foo bar  # Create archive.tar from files foo and bar.\n\
 251   tar -tvf archive.tar         # List all files in archive.tar verbosely.\n\
 252   tar -xf archive.tar          # Extract all files from archive.tar.\n\
 253 \vThe backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
 254 The version control may be set with --backup or VERSION_CONTROL, values are:\n\n\
 255   none, off       never make backups\n\
 256   t, numbered     make numbered backups\n\
 257   nil, existing   numbered if numbered backups exist, simple otherwise\n\
 258   never, simple   always make simple backups\n");
 259
 260
 261 /* NOTE:
 262
 263    Available option letters are DEIJQY and aeqy. Consider the following
 264    assignments:
 265
 266    [For Solaris tar compatibility]
 267    e  exit immediately with a nonzero exit status if unexpected errors occur
 268    E  use extended headers (--format=posix)
 269    [q  alias for --occurrence=1 =/= this would better be used for quiet?]
 270    [I  same as T =/= will harm star compatibility]
 271
 272    y  per-file gzip compression
 273    Y  per-block gzip compression */
 274
 275 static struct argp_option options[] = {
 276   {NULL, 0, NULL, 0,
 277    N_("Main operation mode:"), 0},
 278
 279   {"list", 't', 0, 0,
 280    N_("list the contents of an archive"), 10 },
 281   {"extract", 'x', 0, 0,
 282    N_("extract files from an archive"), 10 },
 283   {"get", 0, 0, OPTION_ALIAS, NULL, 0 },
 284   {"create", 'c', 0, 0,
 285    N_("create a new archive"), 10 },
 286   {"diff", 'd', 0, 0,
 287    N_("find differences between archive and file system"), 10 },
 288   {"compare", 0, 0, OPTION_ALIAS, NULL, 10},
 289   {"append", 'r', 0, 0,
 290    N_("append files to the end of an archive"), 10 },
 291   {"update", 'u', 0, 0,
 292    N_("only append files newer than copy in archive"), 10 },
 293   {"catenate", 'A', 0, 0,
 294    N_("append tar files to an archive"), 10 },
 295   {"concatenate", 0, 0, OPTION_ALIAS, NULL, 10},
 296   {"delete", DELETE_OPTION, 0, 0,
 297    N_("delete from the archive (not on mag tapes!)"), 10 },
 298
 299   {NULL, 0, NULL, 0,
 300    N_("Operation modifiers:"), 20},
 301
 302   {"sparse", 'S', 0, 0,
 303    N_("handle sparse files efficiently"), 21 },
 304   {"incremental", 'G', 0, 0,
 305    N_("handle old GNU-format incremental backup"), 21 },
 306   {"listed-incremental", 'g', N_("FILE"), 0,
 307    N_("handle new GNU-format incremental backup"), 21 },
 308   {"ignore-failed-read", IGNORE_FAILED_READ_OPTION, 0, 0,
 309    N_("do not exit with nonzero on unreadable files"), 21 },
 310   {"occurrence", OCCURRENCE_OPTION, N_("NUMBER"), OPTION_ARG_OPTIONAL,
 311    N_("process only the NUMBERth occurrence of each file in the archive. This option is valid only in conjunction with one of the subcommands --delete, --diff, --extract or --list and when a list of files is given either on the command line or via -T option. NUMBER defaults to 1."), 21 },
 312   {"seek", 'n', NULL, 0,
 313    N_("archive is seekable"), 21 },
 314
 315   {NULL, 0, NULL, 0,
 316    N_("Overwrite control:"), 30},
 317
 318   {"verify", 'W', 0, 0,
 319    N_("attempt to verify the archive after writing it"), 31 },
 320   {"remove-files", REMOVE_FILES_OPTION, 0, 0,
 321    N_("remove files after adding them to the archive"), 31 },
 322   {"keep-old-files", 'k', 0, 0,
 323    N_("don't replace existing files when extracting"), 31 },
 324   {"keep-newer-files", KEEP_NEWER_FILES_OPTION, 0, 0,
 325    N_("don't replace existing files that are newer than their archive copies"), 31 },
 326   {"overwrite", OVERWRITE_OPTION, 0, 0,
 327    N_("overwrite existing files when extracting"), 31 },
 328   {"unlink-first", 'U', 0, 0,
 329    N_("remove each file prior to extracting over it"), 31 },
 330   {"recursive-unlink", RECURSIVE_UNLINK_OPTION, 0, 0,
 331    N_("empty hierarchies prior to extracting directory"), 31 },
 332   {"no-overwrite-dir", NO_OVERWRITE_DIR_OPTION, 0, 0,
 333    N_("preserve metadata of existing directories"), 31 },
 334
 335   {NULL, 0, NULL, 0,
 336    N_("Select output stream:"), 40},
 337
 338   {"to-stdout", 'O', 0, 0,
 339    N_("extract files to standard output"), 41 },
 340   {"to-command", TO_COMMAND_OPTION, N_("COMMAND"), 0,
 341    N_("pipe extracted files to another program"), 41 },
 342   {"ignore-command-error", IGNORE_COMMAND_ERROR_OPTION, 0, 0,
 343    N_("ignore exit codes of children"), 41 },
 344   {"no-ignore-command-error", NO_IGNORE_COMMAND_ERROR_OPTION, 0, 0,
 345    N_("treat non-zero exit codes of children as error"), 41 },
 346
 347   {NULL, 0, NULL, 0,
 348    N_("Handling of file attributes:"), 50 },
 349
 350   {"owner", OWNER_OPTION, N_("NAME"), 0,
 351    N_("force NAME as owner for added files"), 51 },
 352   {"group", GROUP_OPTION, N_("NAME"), 0,
 353    N_("force NAME as group for added files"), 51 },
 354   {"mode", MODE_OPTION, N_("CHANGES"), 0,
 355    N_("force (symbolic) mode CHANGES for added files"), 51 },
 356   {"atime-preserve", ATIME_PRESERVE_OPTION, 0, 0,
 357    N_("don't change access times on dumped files"), 51 },
 358   {"touch", 'm', 0, 0,
 359    N_("don't extract file modified time"), 51 },
 360   {"same-owner", SAME_OWNER_OPTION, 0, 0,
 361    N_("try extracting files with the same ownership"), 51 },
 362   {"no-same-owner", NO_SAME_OWNER_OPTION, 0, 0,
 363    N_("extract files as yourself"), 51 },
 364   {"numeric-owner", NUMERIC_OWNER_OPTION, 0, 0,
 365    N_("always use numbers for user/group names"), 51 },
 366   {"preserve-permissions", 'p', 0, 0,
 367    N_("extract information about file permissions (default for superuser)"),
 368    51 },
 369   {"same-permissions", 0, 0, OPTION_ALIAS, NULL, 51 },
 370   {"no-same-permissions", NO_SAME_PERMISSIONS_OPTION, 0, 0,
 371    N_("apply the user's umask when extracting permissions from the archive (default for ordinary users)"), 51 },
 372   {"preserve-order", 's', 0, 0,
 373    N_("sort names to extract to match archive"), 51 },
 374   {"same-order", 0, 0, OPTION_ALIAS, NULL, 51 },
 375   {"preserve", PRESERVE_OPTION, 0, 0,
 376    N_("same as both -p and -s"), 51 },
 377
 378   {NULL, 0, NULL, 0,
 379    N_("Device selection and switching:"), 60 },
 380
 381   {"file", 'f', N_("ARCHIVE"), 0,
 382    N_("use archive file or device ARCHIVE"), 61 },
 383   {"force-local", FORCE_LOCAL_OPTION, 0, 0,
 384    N_("archive file is local even if it has a colon"), 61 },
 385   {"rmt-command", RMT_COMMAND_OPTION, N_("COMMAND"), 0,
 386    N_("use given rmt COMMAND instead of rmt"), 61 },
 387   {"rsh-command", RSH_COMMAND_OPTION, N_("COMMAND"), 0,
 388    N_("use remote COMMAND instead of rsh"), 61 },
 389 #ifdef DEVICE_PREFIX
 390   {"-[0-7][lmh]", 0, NULL, OPTION_DOC, /* It is OK, since `name' will never be
 391                                           translated */
 392    N_("specify drive and density"), 61 },
 393 #endif
 394   {NULL, '0', NULL, OPTION_HIDDEN, NULL, 61 },
 395   {NULL, '1', NULL, OPTION_HIDDEN, NULL, 61 },
 396   {NULL, '2', NULL, OPTION_HIDDEN, NULL, 61 },
 397   {NULL, '3', NULL, OPTION_HIDDEN, NULL, 61 },
 398   {NULL, '4', NULL, OPTION_HIDDEN, NULL, 61 },
 399   {NULL, '5', NULL, OPTION_HIDDEN, NULL, 61 },
 400   {NULL, '6', NULL, OPTION_HIDDEN, NULL, 61 },
 401   {NULL, '7', NULL, OPTION_HIDDEN, NULL, 61 },
 402   {NULL, '8', NULL, OPTION_HIDDEN, NULL, 61 },
 403   {NULL, '9', NULL, OPTION_HIDDEN, NULL, 61 },
 404
 405   {"multi-volume", 'M', 0, 0,
 406    N_("create/list/extract multi-volume archive"), 61 },
 407   {"tape-length", 'L', N_("NUMBER"), 0,
 408    N_("change tape after writing NUMBER x 1024 bytes"), 61 },
 409   {"info-script", 'F', N_("NAME"), 0,
 410    N_("run script at end of each tape (implies -M)"), 61 },
 411   {"new-volume-script", 0, 0, OPTION_ALIAS, NULL, 61 },
 412   {"volno-file", VOLNO_FILE_OPTION, N_("FILE"), 0,
 413    N_("use/update the volume number in FILE"), 61 },
 414
 415   {NULL, 0, NULL, 0,
 416    N_("Device blocking:"), 70 },
 417
 418   {"blocking-factor", 'b', N_("BLOCKS"), 0,
 419    N_("BLOCKS x 512 bytes per record"), 71 },
 420   {"record-size", RECORD_SIZE_OPTION, N_("NUMBER"), 0,
 421    N_("NUMBER of bytes per record, multiple of 512"), 71 },
 422   {"ignore-zeros", 'i', 0, 0,
 423    N_("ignore zeroed blocks in archive (means EOF)"), 71 },
 424   {"read-full-records", 'B', 0, 0,
 425    N_("reblock as we read (for 4.2BSD pipes)"), 71 },
 426
 427   {NULL, 0, NULL, 0,
 428    N_("Archive format selection:"), 80 },
 429
 430   {"format", 'H', N_("FORMAT"), 0,
 431    N_("create archive of the given format."), 81 },
 432
 433   {NULL, 0, NULL, 0, N_("FORMAT is one of the following:"), 82 },
 434   {"  v7", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("old V7 tar format"), 83},
 435   {"  oldgnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 436    N_("GNU format as per tar <= 1.12"), 83},
 437   {"  gnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 438    N_("GNU tar 1.13.x format"), 83},
 439   {"  ustar", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 440    N_("POSIX 1003.1-1988 (ustar) format"), 83 },
 441   {"  pax", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 442    N_("POSIX 1003.1-2001 (pax) format"), 83 },
 443   {"  posix", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("same as pax"), 83 },
 444
 445   {"old-archive", OLD_ARCHIVE_OPTION, 0, 0, /* FIXME */
 446    N_("same as --format=v7"), 88 },
 447   {"portability", 0, 0, OPTION_ALIAS, NULL, 88 },
 448   {"posix", POSIX_OPTION, 0, 0,
 449    N_("same as --format=posix"), 88 },
 450   {"pax-option", PAX_OPTION, N_("keyword[[:]=value][,keyword[[:]=value], ...]"), 0,
 451    N_("control pax keywords"), 88 },
 452   {"label", 'V', N_("TEXT"), 0,
 453    N_("create archive with volume name TEXT. At list/extract time, use TEXT as a globbing pattern for volume name"), 88 },
 454   {"bzip2", 'j', 0, 0,
 455    N_("filter the archive through bzip2"), 88 },
 456   {"gzip", 'z', 0, 0,
 457    N_("filter the archive through gzip"), 88 },
 458   {"gunzip", 0, 0, OPTION_ALIAS, NULL, 88 },
 459   {"ungzip", 0, 0, OPTION_ALIAS, NULL, 88 },
 460   {"compress", 'Z', 0, 0,
 461    N_("filter the archive through compress"), 88 },
 462   {"uncompress", 0, 0, OPTION_ALIAS, NULL, 88 },
 463   {"use-compress-program", USE_COMPRESS_PROGRAM_OPTION, N_("PROG"), 0,
 464    N_("filter through PROG (must accept -d)"), 88 },
 465
 466   {NULL, 0, NULL, 0,
 467    N_("Local file selection:"), 90 },
 468
 469   {"add-file", ARGP_KEY_ARG, N_("FILE"), 0,
 470    N_("add given FILE to the archive (useful if its name starts with a dash)"), 91},
 471   {"directory", 'C', N_("DIR"), 0,
 472    N_("change to directory DIR"), 91 },
 473   {"files-from", 'T', N_("FILE"), 0,
 474    N_("get names to extract or create from FILE"), 91 },
 475   {"null", NULL_OPTION, 0, 0,
 476    N_("-T reads null-terminated names, disable -C"), 91 },
 477   {"unquote", UNQUOTE_OPTION, 0, 0,
 478    N_("unquote filenames read with -T (default)"), 91 },
 479   {"no-unquote", NO_UNQUOTE_OPTION, 0, 0,
 480    N_("do not unquote filenames read with -T"), 91 },
 481   {"exclude", EXCLUDE_OPTION, N_("PATTERN"), 0,
 482    N_("exclude files, given as a PATTERN"), 91 },
 483   {"exclude-from", 'X', N_("FILE"), 0,
 484    N_("exclude patterns listed in FILE"), 91 },
 485   {"exclude-caches", EXCLUDE_CACHES_OPTION, 0, 0,
 486    N_("exclude directories containing a cache tag"), 91 },
 487   {"ignore-case", IGNORE_CASE_OPTION, 0, 0,
 488    N_("exclusion ignores case"), 91 },
 489   {"anchored", ANCHORED_OPTION, 0, 0,
 490    N_("exclude patterns match file name start"), 91 },
 491   {"no-anchored", NO_ANCHORED_OPTION, 0, 0,
 492    N_("exclude patterns match after any `/' (default)"), 91 },
 493   {"no-ignore-case", NO_IGNORE_CASE_OPTION, 0, 0,
 494    N_("exclusion is case sensitive (default)"), 91 },
 495   {"no-wildcards", NO_WILDCARDS_OPTION, 0, 0,
 496    N_("exclude patterns are plain strings"), 91 },
 497   {"no-wildcards-match-slash", NO_WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
 498    N_("exclude pattern wildcards do not match `/'"), 91 },
 499   {"no-recursion", NO_RECURSION_OPTION, 0, 0,
 500    N_("avoid descending automatically in directories"), 91 },
 501   {"one-file-system", ONE_FILE_SYSTEM_OPTION, 0, 0,
 502    N_("stay in local file system when creating archive"), 91 },
 503   {NULL, 'l', 0, OPTION_HIDDEN, "", 91},
 504   {"recursion", RECURSION_OPTION, 0, 0,
 505    N_("recurse into directories (default)"), 91 },
 506   {"absolute-names", 'P', 0, 0,
 507    N_("don't strip leading `/'s from file names"), 91 },
 508   {"dereference", 'h', 0, 0,
 509    N_("follow symlinks; archive and dump the files they point to"), 91 },
 510   {"starting-file", 'K', N_("MEMBER-NAME"), 0,
 511    N_("begin at member MEMBER-NAME in the archive"), 91 },
 512   {"strip-components", STRIP_COMPONENTS_OPTION, N_("NUMBER"), 0,
 513    N_("strip NUMBER leading components from file names"), 91 },
 514   {"newer", 'N', N_("DATE-OR-FILE"), 0,
 515    N_("only store files newer than DATE-OR-FILE"), 91 },
 516   {"newer-mtime", NEWER_MTIME_OPTION, N_("DATE"), 0,
 517    N_("compare date and time when data changed only"), 91 },
 518   {"after-date", 'N', N_("DATE"), 0,
 519    N_("same as -N"), 91 },
 520   {"backup", BACKUP_OPTION, N_("CONTROL"), OPTION_ARG_OPTIONAL,
 521    N_("backup before removal, choose version CONTROL"), 91 },
 522   {"suffix", SUFFIX_OPTION, N_("STRING"), 0,
 523    N_("backup before removal, override usual suffix ('~' unless overridden by environment variable SIMPLE_BACKUP_SUFFIX)"), 91 },
 524   {"wildcards", WILDCARDS_OPTION, 0, 0,
 525    N_("exclude patterns use wildcards (default)"), 91 },
 526   {"wildcards-match-slash", WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
 527    N_("exclude pattern wildcards match `/' (default)"), 91 },
 528
 529   {NULL, 0, NULL, 0,
 530    N_("Informative output:"), 100 },
 531
 532   {"verbose", 'v', 0, 0,
 533    N_("verbosely list files processed"), 101 },
 534   {"checkpoint", CHECKPOINT_OPTION, 0, 0,
 535    N_("display progress messages every 10th record"), 101 },
 536   {"check-links", CHECK_LINKS_OPTION, 0, 0,
 537    N_("print a message if not all links are dumped"), 102 },
 538   {"totals", TOTALS_OPTION, 0, 0,
 539    N_("print total bytes written while creating archive"), 102 },
 540   {"utc", UTC_OPTION, 0, 0,
 541    N_("print file modification dates in UTC"), 102 },
 542   {"index-file", INDEX_FILE_OPTION, N_("FILE"), 0,
 543    N_("send verbose output to FILE"), 102 },
 544   {"block-number", 'R', 0, 0,
 545    N_("show block number within archive with each message"), 102 },
 546   {"interactive", 'w', 0, 0,
 547    N_("ask for confirmation for every action"), 102 },
 548   {"confirmation", 0, 0, OPTION_ALIAS, NULL, 102 },
 549   {"show-defaults", SHOW_DEFAULTS_OPTION, 0, 0,
 550    N_("Show tar defaults"), 102 },
 551   {"show-omitted-dirs", SHOW_OMITTED_DIRS_OPTION, 0, 0,
 552    N_("When listing or extracting, list each directory that does not match search criteria"), 102 },
 553
 554   {NULL, 0, NULL, 0,
 555    N_("Compatibility options:"), 110 },
 556
 557   {NULL, 'o', 0, 0,
 558    N_("when creating, same as --old-archive. When extracting, same as --no-same-owner"), 111 },
 559
 560   {NULL, 0, NULL, 0,
 561    N_("Other options:"), 120 },
 562
 563   {"help",  '?', 0, 0,  N_("Give this help list"), -1},
 564   {"usage", USAGE_OPTION, 0, 0,  N_("Give a short usage message"), -1},
 565   {"license", LICENSE_OPTION, 0, 0, N_("Print license and exit"), -1},
 566   {"version", VERSION_OPTION, 0, 0,  N_("Print program version"), -1},
 567   /* FIXME -V (--label) conflicts with the default short option for
 568      --version */
 569   {"HANG",        HANG_OPTION,    "SECS", OPTION_ARG_OPTIONAL | OPTION_HIDDEN,
 570    N_("Hang for SECS seconds (default 3600)"), 0},
 571   {0, 0, 0, 0, 0, 0}
 572 };
 573
 574 struct tar_args {
 575   char const *textual_date_option;
 576   int exclude_options;
 577   bool o_option;
 578   int pax_option;
 579   char const *backup_suffix_string;
 580   char const *version_control_string;
 581   int input_files;
 582 };
 583
 584 static void
 585 show_default_settings (FILE *stream)
 586 {
 587   fprintf (stream,
 588            "--format=%s -f%s -b%d --rmt-command=%s",
 589            archive_format_string (DEFAULT_ARCHIVE_FORMAT),
 590            DEFAULT_ARCHIVE, DEFAULT_BLOCKING,
 591            DEFAULT_RMT_COMMAND);
 592 #ifdef REMOTE_SHELL
 593   fprintf (stream, " --rsh-command=%s", REMOTE_SHELL);
 594 #endif
 595   fprintf (stream, "\n");
 596 }
 597
 598 static void
 599 set_subcommand_option (enum subcommand subcommand)
 600 {
 601   if (subcommand_option != UNKNOWN_SUBCOMMAND
 602       && subcommand_option != subcommand)
 603     USAGE_ERROR ((0, 0,
 604                   _("You may not specify more than one `-Acdtrux' option")));
 605
 606   subcommand_option = subcommand;
 607 }
 608
 609 static void
 610 set_use_compress_program_option (const char *string)
 611 {
 612   if (use_compress_program_option
 613       && strcmp (use_compress_program_option, string) != 0)
 614     USAGE_ERROR ((0, 0, _("Conflicting compression options")));
 615
 616   use_compress_program_option = string;
 617 }
 618
 619 void
 620 license ()
 621 {
 622   printf ("tar (%s) %s\n%s\n", PACKAGE_NAME, PACKAGE_VERSION,
 623           "Copyright (C) 2004 Free Software Foundation, Inc.\n");
 624   puts (_("Based on the work of John Gilmore and Jay Fenlason. See AUTHORS\n\
 625 for complete list of authors.\n"));
 626   printf (_("   GNU tar is free software; you can redistribute it and/or modify\n"
 627     "   it under the terms of the GNU General Public License as published by\n"
 628     "   the Free Software Foundation; either version 2 of the License, or\n"
 629     "   (at your option) any later version.\n"
 630     "\n"
 631     "   GNU tar is distributed in the hope that it will be useful,\n"
 632     "   but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
 633     "   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
 634     "   GNU General Public License for more details.\n"
 635     "\n"
 636     "   You should have received a copy of the GNU General Public License\n"
 637     "   along with GNU tar; if not, write to the Free Software\n"
 638     "   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA\n\n"));
 639   exit (0);
 640 }
 641
 642 static volatile int _argp_hang;
 643
 644 static bool
 645 read_name_from_file (FILE *fp, struct obstack *stk)
 646 {
 647   int c;
 648   size_t counter = 0;
 649
 650   for (c = getc (fp); c != EOF && c != filename_terminator; c = getc (fp))
 651     {
 652       if (c == 0)
 653         FATAL_ERROR((0, 0, N_("file name contains null character")));
 654       obstack_1grow (stk, c);
 655       counter++;
 656     }
 657
 658   obstack_1grow (stk, 0);
 659
 660   return !(counter == 0 && c == EOF);
 661 }
 662
 663 \f
 664 static bool files_from_option;  /* When set, tar will not refuse to create
 665                                    empty archives */
 666 static struct obstack argv_stk; /* Storage for additional command line options
 667                                    read using -T option */
 668
 669 /* Prevent recursive inclusion of the same file */
 670 struct file_id_list
 671 {
 672   struct file_id_list *next;
 673   ino_t ino;
 674   dev_t dev;
 675 };
 676
 677 static struct file_id_list *file_id_list;
 678
 679 static void
 680 add_file_id (const char *filename)
 681 {
 682   struct file_id_list *p;
 683   struct stat st;
 684
 685   if (stat (filename, &st))
 686     stat_fatal (filename);
 687   for (p = file_id_list; p; p = p->next)
 688     if (p->ino == st.st_ino && p->dev == st.st_dev)
 689       {
 690         FATAL_ERROR ((0, 0, _("%s: file list already read"),
 691                       quotearg_colon (filename)));
 692       }
 693   p = xmalloc (sizeof *p);
 694   p->next = file_id_list;
 695   p->ino = st.st_ino;
 696   p->dev = st.st_dev;
 697   file_id_list = p;
 698 }
 699
 700 static void
 701 update_argv (const char *filename, struct argp_state *state)
 702 {
 703   FILE *fp;
 704   size_t count = 0, i;
 705   char *start, *p;
 706   char **new_argv;
 707   size_t new_argc;
 708   bool is_stdin = false;
 709
 710   if (!strcmp (filename, "-"))
 711     {
 712       is_stdin = true;
 713       request_stdin ("-T");
 714       fp = stdin;
 715     }
 716   else
 717     {
 718       add_file_id (filename);
 719       if ((fp = fopen (filename, "r")) == NULL)
 720         open_fatal (filename);
 721     }
 722
 723   while (read_name_from_file (fp, &argv_stk))
 724     count++;
 725
 726   if (!is_stdin)
 727     fclose (fp);
 728
 729   if (count == 0)
 730     return;
 731
 732   start = obstack_finish (&argv_stk);
 733
 734   if (filename_terminator == 0)
 735     for (p = start; *p; p += strlen (p) + 1)
 736       if (p[0] == '-')
 737         count++;
 738
 739   new_argc = state->argc + count;
 740   new_argv = xmalloc (sizeof (state->argv[0]) * (new_argc + 1));
 741   memcpy (new_argv, state->argv, sizeof (state->argv[0]) * (state->argc + 1));
 742   state->argv = new_argv;
 743   memmove (&state->argv[state->next + count], &state->argv[state->next],
 744            (state->argc - state->next + 1) * sizeof (state->argv[0]));
 745
 746   state->argc = new_argc;
 747
 748   for (i = state->next, p = start; *p; p += strlen (p) + 1, i++)
 749     {
 750       if (filename_terminator == 0 && p[0] == '-')
 751         state->argv[i++] = "--add-file";
 752       state->argv[i] = p;
 753     }
 754 }
 755
 756 \f
 757 static error_t
 758 parse_opt (int key, char *arg, struct argp_state *state)
 759 {
 760   struct tar_args *args = state->input;
 761
 762   switch (key)
 763     {
 764       case ARGP_KEY_ARG:
 765         /* File name or non-parsed option, because of ARGP_IN_ORDER */
 766         name_add (arg);
 767         args->input_files++;
 768         break;
 769
 770     case 'A':
 771       set_subcommand_option (CAT_SUBCOMMAND);
 772       break;
 773
 774     case 'b':
 775       {
 776         uintmax_t u;
 777         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
 778                && u == (blocking_factor = u)
 779                && 0 < blocking_factor
 780                && u == (record_size = u * BLOCKSIZE) / BLOCKSIZE))
 781           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
 782                         _("Invalid blocking factor")));
 783       }
 784       break;
 785
 786     case 'B':
 787       /* Try to reblock input records.  For reading 4.2BSD pipes.  */
 788
 789       /* It would surely make sense to exchange -B and -R, but it seems
 790          that -B has been used for a long while in Sun tar and most
 791          BSD-derived systems.  This is a consequence of the block/record
 792          terminology confusion.  */
 793
 794       read_full_records_option = true;
 795       break;
 796
 797     case 'c':
 798       set_subcommand_option (CREATE_SUBCOMMAND);
 799       break;
 800
 801     case 'C':
 802       name_add ("-C");
 803       name_add (arg);
 804       break;
 805
 806     case 'd':
 807       set_subcommand_option (DIFF_SUBCOMMAND);
 808       break;
 809
 810     case 'f':
 811       if (archive_names == allocated_archive_names)
 812         {
 813           allocated_archive_names *= 2;
 814           archive_name_array =
 815             xrealloc (archive_name_array,
 816                       sizeof (const char *) * allocated_archive_names);
 817         }
 818       archive_name_array[archive_names++] = arg;
 819       break;
 820
 821     case 'F':
 822       /* Since -F is only useful with -M, make it implied.  Run this
 823          script at the end of each tape.  */
 824
 825       info_script_option = arg;
 826       multi_volume_option = true;
 827       break;
 828
 829     case 'g':
 830       listed_incremental_option = arg;
 831       after_date_option = true;
 832       /* Fall through.  */
 833
 834     case 'G':
 835       /* We are making an incremental dump (FIXME: are we?); save
 836          directories at the beginning of the archive, and include in each
 837          directory its contents.  */
 838
 839       incremental_option = true;
 840       break;
 841
 842     case 'h':
 843       /* Follow symbolic links.  */
 844       dereference_option = true;
 845       break;
 846
 847     case 'i':
 848       /* Ignore zero blocks (eofs).  This can't be the default,
 849          because Unix tar writes two blocks of zeros, then pads out
 850          the record with garbage.  */
 851
 852       ignore_zeros_option = true;
 853       break;
 854
 855     case 'I':
 856       USAGE_ERROR ((0, 0,
 857                     _("Warning: the -I option is not supported;"
 858                       " perhaps you meant -j or -T?")));
 859       break;
 860
 861     case 'j':
 862       set_use_compress_program_option ("bzip2");
 863       break;
 864
 865     case 'k':
 866       /* Don't replace existing files.  */
 867       old_files_option = KEEP_OLD_FILES;
 868       break;
 869
 870     case 'K':
 871       starting_file_option = true;
 872       addname (arg, 0);
 873       break;
 874
 875     case 'l':
 876       /* Historically equivalent to --one-file-system. This usage is
 877          incompatible with UNIX98 and POSIX specs and therefore is
 878          deprecated. The semantics of -l option will be changed in
 879          future versions. See TODO.
 880       */
 881       WARN ((0, 0,
 882              _("Semantics of -l option will change in the future releases.")));
 883       WARN ((0, 0,
 884              _("Please use --one-file-system option instead.")));
 885       /* FALL THROUGH */
 886     case ONE_FILE_SYSTEM_OPTION:
 887       /* When dumping directories, don't dump files/subdirectories
 888          that are on other filesystems. */
 889       one_file_system_option = true;
 890       break;
 891
 892     case 'L':
 893       {
 894         uintmax_t u;
 895         if (xstrtoumax (arg, 0, 10, &u, "") != LONGINT_OK)
 896           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
 897                         _("Invalid tape length")));
 898         tape_length_option = 1024 * (tarlong) u;
 899         multi_volume_option = true;
 900       }
 901       break;
 902
 903     case 'm':
 904       touch_option = true;
 905       break;
 906
 907     case 'M':
 908       /* Make multivolume archive: when we can't write any more into
 909          the archive, re-open it, and continue writing.  */
 910
 911       multi_volume_option = true;
 912       break;
 913
 914     case 'n':
 915       seekable_archive = true;
 916       break;
 917
 918 #if !MSDOS
 919     case 'N':
 920       after_date_option = true;
 921       /* Fall through.  */
 922
 923     case NEWER_MTIME_OPTION:
 924       if (NEWER_OPTION_INITIALIZED (newer_mtime_option))
 925         USAGE_ERROR ((0, 0, _("More than one threshold date")));
 926
 927       if (FILE_SYSTEM_PREFIX_LEN (arg) != 0
 928           || ISSLASH (*arg)
 929           || *arg == '.')
 930         {
 931           struct stat st;
 932           if (deref_stat (dereference_option, arg, &st) != 0)
 933             {
 934               stat_error (arg);
 935               USAGE_ERROR ((0, 0, _("Date sample file not found")));
 936             }
 937           newer_mtime_option.tv_sec = st.st_mtime;
 938           newer_mtime_option.tv_nsec = TIMESPEC_NS (st.st_mtim);
 939         }
 940       else
 941         {
 942           if (! get_date (&newer_mtime_option, arg, NULL))
 943             {
 944               WARN ((0, 0, _("Substituting %s for unknown date format %s"),
 945                      tartime (newer_mtime_option.tv_sec), quote (arg)));
 946               newer_mtime_option.tv_nsec = 0;
 947             }
 948           else
 949             args->textual_date_option = arg;
 950         }
 951
 952       break;
 953 #endif /* not MSDOS */
 954
 955     case 'o':
 956       args->o_option = true;
 957       break;
 958
 959     case 'O':
 960       to_stdout_option = true;
 961       break;
 962
 963     case 'p':
 964       same_permissions_option = true;
 965       break;
 966
 967     case 'P':
 968       absolute_names_option = true;
 969       break;
 970
 971     case 'r':
 972       set_subcommand_option (APPEND_SUBCOMMAND);
 973       break;
 974
 975     case 'R':
 976       /* Print block numbers for debugging bad tar archives.  */
 977
 978       /* It would surely make sense to exchange -B and -R, but it seems
 979          that -B has been used for a long while in Sun tar ans most
 980          BSD-derived systems.  This is a consequence of the block/record
 981          terminology confusion.  */
 982
 983       block_number_option = true;
 984       break;
 985
 986     case 's':
 987       /* Names to extr are sorted.  */
 988
 989       same_order_option = true;
 990       break;
 991
 992     case 'S':
 993       sparse_option = true;
 994       break;
 995
 996     case 't':
 997       set_subcommand_option (LIST_SUBCOMMAND);
 998       verbose_option++;
 999       break;
1000
1001     case 'T':
1002       update_argv (arg, state);
1003       /* Indicate we've been given -T option. This is for backward
1004          compatibility only, so that `tar cfT archive /dev/null will
1005          succeed */
1006       files_from_option = true;
1007       break;
1008
1009     case 'u':
1010       set_subcommand_option (UPDATE_SUBCOMMAND);
1011       break;
1012
1013     case 'U':
1014       old_files_option = UNLINK_FIRST_OLD_FILES;
1015       break;
1016
1017     case UTC_OPTION:
1018       utc_option = true;
1019       break;
1020
1021     case 'v':
1022       verbose_option++;
1023       break;
1024
1025     case 'V':
1026       volume_label_option = arg;
1027       break;
1028
1029     case 'w':
1030       interactive_option = true;
1031       break;
1032
1033     case 'W':
1034       verify_option = true;
1035       break;
1036
1037     case 'x':
1038       set_subcommand_option (EXTRACT_SUBCOMMAND);
1039       break;
1040
1041     case 'X':
1042       if (add_exclude_file (add_exclude, excluded, arg,
1043                             args->exclude_options | recursion_option, '\n')
1044           != 0)
1045         {
1046           int e = errno;
1047           FATAL_ERROR ((0, e, "%s", quotearg_colon (arg)));
1048         }
1049       break;
1050
1051     case 'y':
1052       USAGE_ERROR ((0, 0,
1053                     _("Warning: the -y option is not supported;"
1054                       " perhaps you meant -j?")));
1055       break;
1056
1057     case 'z':
1058       set_use_compress_program_option ("gzip");
1059       break;
1060
1061     case 'Z':
1062       set_use_compress_program_option ("compress");
1063       break;
1064
1065     case ANCHORED_OPTION:
1066       args->exclude_options |= EXCLUDE_ANCHORED;
1067       break;
1068
1069     case ATIME_PRESERVE_OPTION:
1070       atime_preserve_option = true;
1071       break;
1072
1073     case CHECKPOINT_OPTION:
1074       checkpoint_option = true;
1075       break;
1076
1077     case BACKUP_OPTION:
1078       backup_option = true;
1079       if (arg)
1080         args->version_control_string = arg;
1081       break;
1082
1083     case DELETE_OPTION:
1084       set_subcommand_option (DELETE_SUBCOMMAND);
1085       break;
1086
1087     case EXCLUDE_OPTION:
1088       add_exclude (excluded, arg, args->exclude_options | recursion_option);
1089       break;
1090
1091     case EXCLUDE_CACHES_OPTION:
1092       exclude_caches_option = true;
1093       break;
1094
1095     case FORCE_LOCAL_OPTION:
1096       force_local_option = true;
1097       break;
1098
1099     case 'H':
1100       set_archive_format (arg);
1101       break;
1102
1103     case INDEX_FILE_OPTION:
1104       index_file_name = arg;
1105       break;
1106
1107     case IGNORE_CASE_OPTION:
1108       args->exclude_options |= FNM_CASEFOLD;
1109       break;
1110
1111     case IGNORE_COMMAND_ERROR_OPTION:
1112       ignore_command_error_option = true;
1113       break;
1114
1115     case IGNORE_FAILED_READ_OPTION:
1116       ignore_failed_read_option = true;
1117       break;
1118
1119     case KEEP_NEWER_FILES_OPTION:
1120       old_files_option = KEEP_NEWER_FILES;
1121       break;
1122
1123     case GROUP_OPTION:
1124       if (! (strlen (arg) < GNAME_FIELD_SIZE
1125              && gname_to_gid (arg, &group_option)))
1126         {
1127           uintmax_t g;
1128           if (xstrtoumax (arg, 0, 10, &g, "") == LONGINT_OK
1129               && g == (gid_t) g)
1130             group_option = g;
1131           else
1132             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1133                           _("%s: Invalid group")));
1134         }
1135       break;
1136
1137     case MODE_OPTION:
1138       mode_option
1139         = mode_compile (arg,
1140                         MODE_MASK_EQUALS | MODE_MASK_PLUS | MODE_MASK_MINUS);
1141       if (mode_option == MODE_INVALID)
1142         FATAL_ERROR ((0, 0, _("Invalid mode given on option")));
1143       if (mode_option == MODE_MEMORY_EXHAUSTED)
1144         xalloc_die ();
1145       break;
1146
1147     case NO_ANCHORED_OPTION:
1148       args->exclude_options &= ~ EXCLUDE_ANCHORED;
1149       break;
1150
1151     case NO_IGNORE_CASE_OPTION:
1152       args->exclude_options &= ~ FNM_CASEFOLD;
1153       break;
1154
1155     case NO_IGNORE_COMMAND_ERROR_OPTION:
1156       ignore_command_error_option = false;
1157       break;
1158
1159     case NO_OVERWRITE_DIR_OPTION:
1160       old_files_option = NO_OVERWRITE_DIR_OLD_FILES;
1161       break;
1162
1163     case NO_WILDCARDS_OPTION:
1164       args->exclude_options &= ~ EXCLUDE_WILDCARDS;
1165       break;
1166
1167     case NO_WILDCARDS_MATCH_SLASH_OPTION:
1168       args->exclude_options |= FNM_FILE_NAME;
1169       break;
1170
1171     case NULL_OPTION:
1172       filename_terminator = '\0';
1173       break;
1174
1175     case NUMERIC_OWNER_OPTION:
1176       numeric_owner_option = true;
1177       break;
1178
1179     case OCCURRENCE_OPTION:
1180       if (!arg)
1181         occurrence_option = 1;
1182       else
1183         {
1184           uintmax_t u;
1185           if (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK)
1186             occurrence_option = u;
1187           else
1188             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1189                           _("Invalid number")));
1190         }
1191       break;
1192
1193     case OVERWRITE_OPTION:
1194       old_files_option = OVERWRITE_OLD_FILES;
1195       break;
1196
1197     case OWNER_OPTION:
1198       if (! (strlen (arg) < UNAME_FIELD_SIZE
1199              && uname_to_uid (arg, &owner_option)))
1200         {
1201           uintmax_t u;
1202           if (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1203               && u == (uid_t) u)
1204             owner_option = u;
1205           else
1206             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1207                           _("Invalid owner")));
1208         }
1209       break;
1210
1211     case PAX_OPTION:
1212       args->pax_option++;
1213       xheader_set_option (arg);
1214       break;
1215
1216     case POSIX_OPTION:
1217       set_archive_format ("posix");
1218       break;
1219
1220     case PRESERVE_OPTION:
1221       same_permissions_option = true;
1222       same_order_option = true;
1223       break;
1224
1225     case RECORD_SIZE_OPTION:
1226       {
1227         uintmax_t u;
1228         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1229                && u == (size_t) u))
1230           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1231                         _("Invalid record size")));
1232         record_size = u;
1233         if (record_size % BLOCKSIZE != 0)
1234           USAGE_ERROR ((0, 0, _("Record size must be a multiple of %d."),
1235                         BLOCKSIZE));
1236         blocking_factor = record_size / BLOCKSIZE;
1237       }
1238       break;
1239
1240     case RECURSIVE_UNLINK_OPTION:
1241       recursive_unlink_option = true;
1242       break;
1243
1244     case REMOVE_FILES_OPTION:
1245       remove_files_option = true;
1246       break;
1247
1248     case RMT_COMMAND_OPTION:
1249       rmt_command = arg;
1250       break;
1251
1252     case RSH_COMMAND_OPTION:
1253       rsh_command_option = arg;
1254       break;
1255
1256     case SHOW_DEFAULTS_OPTION:
1257       show_default_settings (stdout);
1258       exit(0);
1259
1260     case STRIP_COMPONENTS_OPTION:
1261       {
1262         uintmax_t u;
1263         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1264                && u == (size_t) u))
1265           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1266                         _("Invalid number of elements")));
1267         strip_name_components = u;
1268       }
1269       break;
1270
1271     case SHOW_OMITTED_DIRS_OPTION:
1272       show_omitted_dirs_option = true;
1273       break;
1274
1275     case SUFFIX_OPTION:
1276       backup_option = true;
1277       args->backup_suffix_string = arg;
1278       break;
1279
1280     case TO_COMMAND_OPTION:
1281       if (to_command_option)
1282         USAGE_ERROR ((0, 0, _("Only one --to-command option allowed")));
1283       to_command_option = arg;
1284       break;
1285
1286     case TOTALS_OPTION:
1287       totals_option = true;
1288       break;
1289
1290     case USE_COMPRESS_PROGRAM_OPTION:
1291       set_use_compress_program_option (arg);
1292       break;
1293
1294     case VOLNO_FILE_OPTION:
1295       volno_file_option = arg;
1296       break;
1297
1298     case WILDCARDS_OPTION:
1299       args->exclude_options |= EXCLUDE_WILDCARDS;
1300       break;
1301
1302     case WILDCARDS_MATCH_SLASH_OPTION:
1303       args->exclude_options &= ~ FNM_FILE_NAME;
1304       break;
1305
1306     case CHECK_LINKS_OPTION:
1307       check_links_option = 1;
1308       break;
1309
1310     case NO_RECURSION_OPTION:
1311       recursion_option = 0;
1312       break;
1313
1314     case NO_SAME_OWNER_OPTION:
1315       same_owner_option = -1;
1316       break;
1317
1318     case NO_SAME_PERMISSIONS_OPTION:
1319       same_permissions_option = -1;
1320       break;
1321
1322     case RECURSION_OPTION:
1323       recursion_option = FNM_LEADING_DIR;
1324       break;
1325
1326     case SAME_OWNER_OPTION:
1327       same_owner_option = 1;
1328       break;
1329
1330     case UNQUOTE_OPTION:
1331       unquote_option = true;
1332       break;
1333
1334     case NO_UNQUOTE_OPTION:
1335       unquote_option = false;
1336       break;
1337
1338     case '0':
1339     case '1':
1340     case '2':
1341     case '3':
1342     case '4':
1343     case '5':
1344     case '6':
1345     case '7':
1346
1347 #ifdef DEVICE_PREFIX
1348       {
1349         int device = key - '0';
1350         int density;
1351         static char buf[sizeof DEVICE_PREFIX + 10];
1352         char *cursor;
1353
1354         if (arg[1])
1355           argp_error (state, _("Malformed density argument: %s"), quote (arg));
1356
1357         strcpy (buf, DEVICE_PREFIX);
1358         cursor = buf + strlen (buf);
1359
1360 #ifdef DENSITY_LETTER
1361
1362         sprintf (cursor, "%d%c", device, arg[0]);
1363
1364 #else /* not DENSITY_LETTER */
1365
1366         switch (arg[0])
1367           {
1368           case 'l':
1369 #ifdef LOW_NUM
1370             device += LOW_NUM;
1371 #endif
1372             break;
1373
1374           case 'm':
1375 #ifdef MID_NUM
1376             device += MID_NUM;
1377 #else
1378             device += 8;
1379 #endif
1380             break;
1381
1382           case 'h':
1383 #ifdef HGH_NUM
1384             device += HGH_NUM;
1385 #else
1386             device += 16;
1387 #endif
1388             break;
1389
1390           default:
1391             argp_error (state, _("Unknown density: `%c'"), arg[0]);
1392           }
1393         sprintf (cursor, "%d", device);
1394
1395 #endif /* not DENSITY_LETTER */
1396
1397         if (archive_names == allocated_archive_names)
1398           {
1399             allocated_archive_names *= 2;
1400             archive_name_array =
1401               xrealloc (archive_name_array,
1402                         sizeof (const char *) * allocated_archive_names);
1403           }
1404         archive_name_array[archive_names++] = xstrdup (buf);
1405       }
1406       break;
1407
1408 #else /* not DEVICE_PREFIX */
1409
1410       argp_error (state,
1411                   _("Options `-[0-7][lmh]' not supported by *this* tar"));
1412
1413 #endif /* not DEVICE_PREFIX */
1414
1415     case '?':
1416       state->flags |= ARGP_NO_EXIT;
1417       argp_state_help (state, state->out_stream,
1418                        ARGP_HELP_STD_HELP & ~ARGP_HELP_BUG_ADDR);
1419       fprintf (state->out_stream, _("\n*This* tar defaults to:\n"));
1420       show_default_settings (state->out_stream);
1421       fprintf (state->out_stream, "\n");
1422       fprintf (state->out_stream, _("Report bugs to %s.\n"),
1423                argp_program_bug_address);
1424       exit (0);
1425
1426     case USAGE_OPTION:
1427       argp_state_help (state, state->out_stream,
1428                        ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
1429       break;
1430
1431     case VERSION_OPTION:
1432       fprintf (state->out_stream, "%s\n", argp_program_version);
1433       exit (0);
1434
1435     case LICENSE_OPTION:
1436       license ();
1437       break;
1438
1439     case HANG_OPTION:
1440       _argp_hang = atoi (arg ? arg : "3600");
1441       while (_argp_hang-- > 0)
1442         sleep (1);
1443       break;
1444
1445     default:
1446       return ARGP_ERR_UNKNOWN;
1447     }
1448   return 0;
1449 }
1450
1451 static struct argp argp = {
1452   options,
1453   parse_opt,
1454   N_("[FILE]..."),
1455   doc,
1456   NULL,
1457   NULL,
1458   NULL
1459 };
1460
1461 void
1462 usage (int status)
1463 {
1464   argp_help (&argp, stderr, ARGP_HELP_SEE, (char*) program_name);
1465   exit (status);
1466 }
1467
1468 /* Parse the options for tar.  */
1469
1470 static struct argp_option *
1471 find_argp_option (struct argp_option *options, int letter)
1472 {
1473   for (;
1474        !(options->name == NULL
1475          && options->key == 0
1476          && options->arg == 0
1477          && options->flags == 0
1478          && options->doc == NULL); options++)
1479     if (options->key == letter)
1480       return options;
1481   return NULL;
1482 }
1483
1484 static void
1485 decode_options (int argc, char **argv)
1486 {
1487   int index;
1488   struct tar_args args;
1489
1490   /* Set some default option values.  */
1491   args.textual_date_option = NULL;
1492   args.exclude_options = EXCLUDE_WILDCARDS;
1493   args.o_option = 0;
1494   args.pax_option = 0;
1495   args.backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
1496   args.version_control_string = 0;
1497   args.input_files = 0;
1498
1499   subcommand_option = UNKNOWN_SUBCOMMAND;
1500   archive_format = DEFAULT_FORMAT;
1501   blocking_factor = DEFAULT_BLOCKING;
1502   record_size = DEFAULT_BLOCKING * BLOCKSIZE;
1503   excluded = new_exclude ();
1504   newer_mtime_option.tv_sec = TYPE_MINIMUM (time_t);
1505   newer_mtime_option.tv_nsec = -1;
1506   recursion_option = FNM_LEADING_DIR;
1507   unquote_option = true;
1508
1509   owner_option = -1;
1510   group_option = -1;
1511
1512   /* Convert old-style tar call by exploding option element and rearranging
1513      options accordingly.  */
1514
1515   if (argc > 1 && argv[1][0] != '-')
1516     {
1517       int new_argc;             /* argc value for rearranged arguments */
1518       char **new_argv;          /* argv value for rearranged arguments */
1519       char *const *in;          /* cursor into original argv */
1520       char **out;               /* cursor into rearranged argv */
1521       const char *letter;       /* cursor into old option letters */
1522       char buffer[3];           /* constructed option buffer */
1523
1524       /* Initialize a constructed option.  */
1525
1526       buffer[0] = '-';
1527       buffer[2] = '\0';
1528
1529       /* Allocate a new argument array, and copy program name in it.  */
1530
1531       new_argc = argc - 1 + strlen (argv[1]);
1532       new_argv = xmalloc ((new_argc + 1) * sizeof (char *));
1533       in = argv;
1534       out = new_argv;
1535       *out++ = *in++;
1536
1537       /* Copy each old letter option as a separate option, and have the
1538          corresponding argument moved next to it.  */
1539
1540       for (letter = *in++; *letter; letter++)
1541         {
1542           struct argp_option *opt;
1543
1544           buffer[1] = *letter;
1545           *out++ = xstrdup (buffer);
1546           opt = find_argp_option (options, *letter);
1547           if (opt && opt->arg)
1548             {
1549               if (in < argv + argc)
1550                 *out++ = *in++;
1551               else
1552                 USAGE_ERROR ((0, 0, _("Old option `%c' requires an argument."),
1553                               *letter));
1554             }
1555         }
1556
1557       /* Copy all remaining options.  */
1558
1559       while (in < argv + argc)
1560         *out++ = *in++;
1561       *out = 0;
1562
1563       /* Replace the old option list by the new one.  */
1564
1565       argc = new_argc;
1566       argv = new_argv;
1567     }
1568
1569   /* Parse all options and non-options as they appear.  */
1570
1571   prepend_default_options (getenv ("TAR_OPTIONS"), &argc, &argv);
1572
1573   if (argp_parse (&argp, argc, argv, ARGP_IN_ORDER|ARGP_NO_HELP,
1574                   &index, &args))
1575     exit (1);
1576
1577
1578   /* Special handling for 'o' option:
1579
1580      GNU tar used to say "output old format".
1581      UNIX98 tar says don't chown files after extracting (we use
1582      "--no-same-owner" for this).
1583
1584      The old GNU tar semantics is retained when used with --create
1585      option, otherwise UNIX98 semantics is assumed */
1586
1587   if (args.o_option)
1588     {
1589       if (subcommand_option == CREATE_SUBCOMMAND)
1590         {
1591           /* GNU Tar <= 1.13 compatibility */
1592           set_archive_format ("v7");
1593         }
1594       else
1595         {
1596           /* UNIX98 compatibility */
1597           same_owner_option = -1;
1598         }
1599     }
1600
1601   /* Handle operands after any "--" argument.  */
1602   for (; index < argc; index++)
1603     {
1604       name_add (argv[index]);
1605       args.input_files++;
1606     }
1607
1608   /* Derive option values and check option consistency.  */
1609
1610   if (archive_format == DEFAULT_FORMAT)
1611     {
1612       if (args.pax_option)
1613         archive_format = POSIX_FORMAT;
1614       else
1615         archive_format = DEFAULT_ARCHIVE_FORMAT;
1616     }
1617
1618   if (volume_label_option && subcommand_option == CREATE_SUBCOMMAND)
1619     assert_format (FORMAT_MASK (OLDGNU_FORMAT)
1620                    | FORMAT_MASK (GNU_FORMAT));
1621
1622
1623   if (incremental_option || multi_volume_option)
1624     assert_format (FORMAT_MASK (OLDGNU_FORMAT) | FORMAT_MASK (GNU_FORMAT));
1625
1626   if (sparse_option)
1627     assert_format (FORMAT_MASK (OLDGNU_FORMAT)
1628                    | FORMAT_MASK (GNU_FORMAT)
1629                    | FORMAT_MASK (POSIX_FORMAT));
1630
1631   if (occurrence_option)
1632     {
1633       if (!args.input_files)
1634         USAGE_ERROR ((0, 0,
1635                       _("--occurrence is meaningless without a file list")));
1636       if (subcommand_option != DELETE_SUBCOMMAND
1637           && subcommand_option != DIFF_SUBCOMMAND
1638           && subcommand_option != EXTRACT_SUBCOMMAND
1639           && subcommand_option != LIST_SUBCOMMAND)
1640             USAGE_ERROR ((0, 0,
1641                           _("--occurrence cannot be used in the requested operation mode")));
1642     }
1643
1644   if (seekable_archive && subcommand_option == DELETE_SUBCOMMAND)
1645     {
1646       /* The current code in delete.c is based on the assumption that
1647          skip_member() reads all data from the archive. So, we should
1648          make sure it won't use seeks. On the other hand, the same code
1649          depends on the ability to backspace a record in the archive,
1650          so setting seekable_archive to false is technically incorrect.
1651          However, it is tested only in skip_member(), so it's not a
1652          problem. */
1653       seekable_archive = false;
1654     }
1655
1656   if (archive_names == 0)
1657     {
1658       /* If no archive file name given, try TAPE from the environment, or
1659          else, DEFAULT_ARCHIVE from the configuration process.  */
1660
1661       archive_names = 1;
1662       archive_name_array[0] = getenv ("TAPE");
1663       if (! archive_name_array[0])
1664         archive_name_array[0] = DEFAULT_ARCHIVE;
1665     }
1666
1667   /* Allow multiple archives only with `-M'.  */
1668
1669   if (archive_names > 1 && !multi_volume_option)
1670     USAGE_ERROR ((0, 0,
1671                   _("Multiple archive files require `-M' option")));
1672
1673   if (listed_incremental_option
1674       && NEWER_OPTION_INITIALIZED (newer_mtime_option))
1675     USAGE_ERROR ((0, 0,
1676                   _("Cannot combine --listed-incremental with --newer")));
1677
1678   if (volume_label_option)
1679     {
1680       size_t volume_label_max_len =
1681         (sizeof current_header->header.name
1682          - 1 /* for trailing '\0' */
1683          - (multi_volume_option
1684             ? (sizeof " Volume "
1685                - 1 /* for null at end of " Volume " */
1686                + INT_STRLEN_BOUND (int) /* for volume number */
1687                - 1 /* for sign, as 0 <= volno */)
1688             : 0));
1689       if (volume_label_max_len < strlen (volume_label_option))
1690         USAGE_ERROR ((0, 0,
1691                       ngettext ("%s: Volume label is too long (limit is %lu byte)",
1692                                 "%s: Volume label is too long (limit is %lu bytes)",
1693                                 volume_label_max_len),
1694                       quotearg_colon (volume_label_option),
1695                       (unsigned long) volume_label_max_len));
1696     }
1697
1698   if (verify_option)
1699     {
1700       if (multi_volume_option)
1701         USAGE_ERROR ((0, 0, _("Cannot verify multi-volume archives")));
1702       if (use_compress_program_option)
1703         USAGE_ERROR ((0, 0, _("Cannot verify compressed archives")));
1704     }
1705
1706   if (use_compress_program_option)
1707     {
1708       if (multi_volume_option)
1709         USAGE_ERROR ((0, 0, _("Cannot use multi-volume compressed archives")));
1710       if (subcommand_option == UPDATE_SUBCOMMAND)
1711         USAGE_ERROR ((0, 0, _("Cannot update compressed archives")));
1712     }
1713
1714   /* It is no harm to use --pax-option on non-pax archives in archive
1715      reading mode. It may even be useful, since it allows to override
1716      file attributes from tar headers. Therefore I allow such usage.
1717      --gray */
1718   if (args.pax_option
1719       && archive_format != POSIX_FORMAT
1720       && (subcommand_option != EXTRACT_SUBCOMMAND
1721           || subcommand_option != DIFF_SUBCOMMAND
1722           || subcommand_option != LIST_SUBCOMMAND))
1723     USAGE_ERROR ((0, 0, _("--pax-option can be used only on POSIX archives")));
1724
1725   /* If ready to unlink hierarchies, so we are for simpler files.  */
1726   if (recursive_unlink_option)
1727     old_files_option = UNLINK_FIRST_OLD_FILES;
1728
1729   if (utc_option)
1730     verbose_option = 2;
1731
1732   /* Forbid using -c with no input files whatsoever.  Check that `-f -',
1733      explicit or implied, is used correctly.  */
1734
1735   switch (subcommand_option)
1736     {
1737     case CREATE_SUBCOMMAND:
1738       if (args.input_files == 0 && !files_from_option)
1739         USAGE_ERROR ((0, 0,
1740                       _("Cowardly refusing to create an empty archive")));
1741       break;
1742
1743     case EXTRACT_SUBCOMMAND:
1744     case LIST_SUBCOMMAND:
1745     case DIFF_SUBCOMMAND:
1746       for (archive_name_cursor = archive_name_array;
1747            archive_name_cursor < archive_name_array + archive_names;
1748            archive_name_cursor++)
1749         if (!strcmp (*archive_name_cursor, "-"))
1750           request_stdin ("-f");
1751       break;
1752
1753     case CAT_SUBCOMMAND:
1754     case UPDATE_SUBCOMMAND:
1755     case APPEND_SUBCOMMAND:
1756       for (archive_name_cursor = archive_name_array;
1757            archive_name_cursor < archive_name_array + archive_names;
1758            archive_name_cursor++)
1759         if (!strcmp (*archive_name_cursor, "-"))
1760           USAGE_ERROR ((0, 0,
1761                         _("Options `-Aru' are incompatible with `-f -'")));
1762
1763     default:
1764       break;
1765     }
1766
1767   archive_name_cursor = archive_name_array;
1768
1769   /* Prepare for generating backup names.  */
1770
1771   if (args.backup_suffix_string)
1772     simple_backup_suffix = xstrdup (args.backup_suffix_string);
1773
1774   if (backup_option)
1775     {
1776       backup_type = xget_version ("--backup", args.version_control_string);
1777       /* No backup is needed either if explicitely disabled or if
1778          the extracted files are not being written to disk. */
1779       if (backup_type == no_backups || EXTRACT_OVER_PIPE)
1780         backup_option = false;
1781     }
1782
1783   if (verbose_option && args.textual_date_option)
1784     {
1785       /* FIXME: tartime should support nanoseconds, too, so that this
1786          comparison doesn't complain about lost nanoseconds.  */
1787       char const *treated_as = tartime (newer_mtime_option.tv_sec);
1788       if (strcmp (args.textual_date_option, treated_as) != 0)
1789         WARN ((0, 0,
1790                ngettext ("Treating date `%s' as %s + %ld nanosecond",
1791                          "Treating date `%s' as %s + %ld nanoseconds",
1792                          newer_mtime_option.tv_nsec),
1793                args.textual_date_option, treated_as,
1794                newer_mtime_option.tv_nsec));
1795     }
1796 }
1797
1798 \f
1799 /* Tar proper.  */
1800
1801 /* Main routine for tar.  */
1802 int
1803 main (int argc, char **argv)
1804 {
1805   set_start_time ();
1806   program_name = argv[0];
1807
1808   setlocale (LC_ALL, "");
1809   bindtextdomain (PACKAGE, LOCALEDIR);
1810   textdomain (PACKAGE);
1811
1812   exit_status = TAREXIT_SUCCESS;
1813   filename_terminator = '\n';
1814   set_quoting_style (0, escape_quoting_style);
1815
1816   /* Pre-allocate a few structures.  */
1817
1818   allocated_archive_names = 10;
1819   archive_name_array =
1820     xmalloc (sizeof (const char *) * allocated_archive_names);
1821   archive_names = 0;
1822
1823   obstack_init (&argv_stk);
1824
1825 #ifdef SIGCHLD
1826   /* System V fork+wait does not work if SIGCHLD is ignored.  */
1827   signal (SIGCHLD, SIG_DFL);
1828 #endif
1829
1830   init_names ();
1831
1832   /* Decode options.  */
1833
1834   decode_options (argc, argv);
1835   name_init ();
1836
1837   /* Main command execution.  */
1838
1839   if (volno_file_option)
1840     init_volume_number ();
1841
1842   switch (subcommand_option)
1843     {
1844     case UNKNOWN_SUBCOMMAND:
1845       USAGE_ERROR ((0, 0,
1846                     _("You must specify one of the `-Acdtrux' options")));
1847
1848     case CAT_SUBCOMMAND:
1849     case UPDATE_SUBCOMMAND:
1850     case APPEND_SUBCOMMAND:
1851       update_archive ();
1852       break;
1853
1854     case DELETE_SUBCOMMAND:
1855       delete_archive_members ();
1856       break;
1857
1858     case CREATE_SUBCOMMAND:
1859       create_archive ();
1860       if (totals_option)
1861         print_total_written ();
1862       break;
1863
1864     case EXTRACT_SUBCOMMAND:
1865       extr_init ();
1866       read_and (extract_archive);
1867
1868       /* FIXME: should extract_finish () even if an ordinary signal is
1869          received.  */
1870       extract_finish ();
1871
1872       break;
1873
1874     case LIST_SUBCOMMAND:
1875       read_and (list_archive);
1876       break;
1877
1878     case DIFF_SUBCOMMAND:
1879       diff_init ();
1880       read_and (diff_archive);
1881       break;
1882     }
1883
1884   if (check_links_option)
1885     check_links ();
1886
1887   if (volno_file_option)
1888     closeout_volume_number ();
1889
1890   /* Dispose of allocated memory, and return.  */
1891
1892   free (archive_name_array);
1893   name_term ();
1894
1895   if (stdlis != stderr && (ferror (stdlis) || fclose (stdlis) != 0))
1896     FATAL_ERROR ((0, 0, _("Error in writing to standard output")));
1897   if (exit_status == TAREXIT_FAILURE)
1898     error (0, 0, _("Error exit delayed from previous errors"));
1899   if (ferror (stderr) || fclose (stderr) != 0)
1900     exit_status = TAREXIT_FAILURE;
1901   return exit_status;
1902 }
1903
1904 void
1905 tar_stat_init (struct tar_stat_info *st)
1906 {
1907   memset (st, 0, sizeof (*st));
1908 }
1909
1910 void
1911 tar_stat_destroy (struct tar_stat_info *st)
1912 {
1913   free (st->orig_file_name);
1914   free (st->file_name);
1915   free (st->link_name);
1916   free (st->uname);
1917   free (st->gname);
1918   free (st->sparse_map);
1919   memset (st, 0, sizeof (*st));
1920 }