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GeezerVison is showing github.com — gnu_tar/src/create.c at master · gitGNU/gnu_tar Expand file tree/ Copy pathcreate.cMore file actions 1976 lines (1706 loc) · 51.8 KB / Copy pathcreate.cFile metadata and controls1976 lines (1706 loc) · 51.8 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 /* Create a tar archive. Copyright 1985, 1992-1994, 1996-1997, 1999-2001, 2003-2007, 2009-2010, 2012-2014, 2016-2017 Free Software Foundation, Inc. This file is part of GNU tar. GNU tar is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. GNU tar is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. Written by John Gilmore, on 1985-08-25. */ #include <system.h> #include <areadlink.h> #include <quotearg.h> #include "common.h" #include <hash.h> /* Error number to use when an impostor is discovered. Pretend the impostor isn't there. */ enum { IMPOSTOR_ERRNO = ENOENT }; struct link { dev_t dev; ino_t ino; nlink_t nlink; char name[1]; }; struct exclusion_tag { const char *name; size_t length; enum exclusion_tag_type type; bool (*predicate) (int fd); struct exclusion_tag *next; }; static struct exclusion_tag *exclusion_tags; void add_exclusion_tag (const char *name, enum exclusion_tag_type type, bool (*predicate) (int fd)) { struct exclusion_tag *tag = xmalloc (sizeof tag[0]); tag->next = exclusion_tags; tag->name = name; tag->type = type; tag->predicate = predicate; tag->length = strlen (name); exclusion_tags = tag; } void exclusion_tag_warning (const char *dirname, const char *tagname, const char *message) { if (verbose_option) WARNOPT (WARN_CACHEDIR, (0, 0, _("%s: contains a cache directory tag %s; %s"), quotearg_colon (dirname), quotearg_n (1, tagname), message)); } enum exclusion_tag_type check_exclusion_tags (struct tar_stat_info const *st, char const **tag_file_name) { struct exclusion_tag *tag; for (tag = exclusion_tags; tag; tag = tag->next) { int tagfd = subfile_open (st, tag->name, open_read_flags); if (0 <= tagfd) { bool satisfied = !tag->predicate || tag->predicate (tagfd); close (tagfd); if (satisfied) { if (tag_file_name) *tag_file_name = tag->name; return tag->type; } } } return exclusion_tag_none; } /* Exclusion predicate to test if the named file (usually "CACHEDIR.TAG") contains a valid header, as described at: http://www.brynosaurus.com/cachedir Applications can write this file into directories they create for use as caches containing purely regenerable, non-precious data, allowing us to avoid archiving them if --exclude-caches is specified. */ #define CACHEDIR_SIGNATURE "Signature: 8a477f597d28d172789f06886806bc55" #define CACHEDIR_SIGNATURE_SIZE (sizeof CACHEDIR_SIGNATURE - 1) bool cachedir_file_p (int fd) { char tagbuf[CACHEDIR_SIGNATURE_SIZE]; return (read (fd, tagbuf, CACHEDIR_SIGNATURE_SIZE) == CACHEDIR_SIGNATURE_SIZE && memcmp (tagbuf, CACHEDIR_SIGNATURE, CACHEDIR_SIGNATURE_SIZE) == 0); } /* The maximum uintmax_t value that can be represented with DIGITS digits, assuming that each digit is BITS_PER_DIGIT wide. */ #define MAX_VAL_WITH_DIGITS(digits, bits_per_digit) \ ((digits) * (bits_per_digit) < sizeof (uintmax_t) * CHAR_BIT \ ? ((uintmax_t) 1 << ((digits) * (bits_per_digit))) - 1 \ : (uintmax_t) -1) /* The maximum uintmax_t value that can be represented with octal digits and a trailing NUL in BUFFER. */ #define MAX_OCTAL_VAL(buffer) MAX_VAL_WITH_DIGITS (sizeof (buffer) - 1, LG_8) /* Convert VALUE to an octal representation suitable for tar headers. Output to buffer WHERE with size SIZE. The result is undefined if SIZE is 0 or if VALUE is too large to fit. */ static void to_octal (uintmax_t value, char *where, size_t size) { uintmax_t v = value; size_t i = size; do { where[--i] = '0' + (v & ((1 << LG_8) - 1)); v >>= LG_8; } while (i); } /* Copy at most LEN bytes from the string SRC to DST. Terminate with NUL unless SRC is LEN or more bytes long. */ static void tar_copy_str (char *dst, const char *src, size_t len) { size_t i; for (i = 0; i < len; i++) if (! (dst[i] = src[i])) break; } /* Same as tar_copy_str, but always terminate with NUL if using is OLDGNU format */ static void tar_name_copy_str (char *dst, const char *src, size_t len) { tar_copy_str (dst, src, len); if (archive_format == OLDGNU_FORMAT) dst[len-1] = 0; } /* Convert NEGATIVE VALUE to a base-256 representation suitable for tar headers. NEGATIVE is 1 if VALUE was negative before being cast to uintmax_t, 0 otherwise. Output to buffer WHERE with size SIZE. The result is undefined if SIZE is 0 or if VALUE is too large to fit. */ static void to_base256 (int negative, uintmax_t value, char *where, size_t size) { uintmax_t v = value; uintmax_t propagated_sign_bits = ((uintmax_t) - negative << (CHAR_BIT * sizeof v - LG_256)); size_t i = size; do { where[--i] = v & ((1 << LG_256) - 1); v = propagated_sign_bits | (v >> LG_256); } while (i); } #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where)) #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where)) #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where)) #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where)) #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where)) #define UNAME_TO_CHARS(name, buf) string_to_chars (name, buf, sizeof (buf)) #define GNAME_TO_CHARS(name, buf) string_to_chars (name, buf, sizeof (buf)) static bool to_chars (int negative, uintmax_t value, size_t valsize, uintmax_t (*substitute) (int *), char *where, size_t size, const char *type); static bool to_chars_subst (int negative, int gnu_format, uintmax_t value, size_t valsize, uintmax_t (*substitute) (int *), char *where, size_t size, const char *type) { uintmax_t maxval = (gnu_format ? MAX_VAL_WITH_DIGITS (size - 1, LG_256) : MAX_VAL_WITH_DIGITS (size - 1, LG_8)); char valbuf[UINTMAX_STRSIZE_BOUND + 1]; char maxbuf[UINTMAX_STRSIZE_BOUND]; char minbuf[UINTMAX_STRSIZE_BOUND + 1]; char const *minval_string; char const *maxval_string = STRINGIFY_BIGINT (maxval, maxbuf); char const *value_string; if (gnu_format) { uintmax_t m = maxval + 1 ? maxval + 1 : maxval / 2 + 1; char *p = STRINGIFY_BIGINT (m, minbuf + 1); *--p = '-'; minval_string = p; } else minval_string = "0"; if (negative) { char *p = STRINGIFY_BIGINT (- value, valbuf + 1); *--p = '-'; value_string = p; } else value_string = STRINGIFY_BIGINT (value, valbuf); if (substitute) { int negsub; uintmax_t sub = substitute (&negsub) & maxval; /* NOTE: This is one of the few places where GNU_FORMAT differs from OLDGNU_FORMAT. The actual differences are: 1. In OLDGNU_FORMAT all strings in a tar header end in \0 2. Incremental archives use oldgnu_header. Apart from this they are completely identical. */ uintmax_t s = (negsub &= archive_format == GNU_FORMAT) ? - sub : sub; char subbuf[UINTMAX_STRSIZE_BOUND + 1]; char *sub_string = STRINGIFY_BIGINT (s, subbuf + 1); if (negsub) *--sub_string = '-'; WARN ((0, 0, _("value %s out of %s range %s..%s; substituting %s"), value_string, type, minval_string, maxval_string, sub_string)); return to_chars (negsub, s, valsize, 0, where, size, type); } else ERROR ((0, 0, _("value %s out of %s range %s..%s"), value_string, type, minval_string, maxval_string)); return false; } /* Convert NEGATIVE VALUE (which was originally of size VALSIZE) to external form, using SUBSTITUTE (...) if VALUE won't fit. Output to buffer WHERE with size SIZE. NEGATIVE is 1 iff VALUE was negative before being cast to uintmax_t; its original bitpattern can be deduced from VALSIZE, its original size before casting. TYPE is the kind of value being output (useful for diagnostics). Prefer the POSIX format of SIZE - 1 octal digits (with leading zero digits), followed by '\0'. If this won't work, and if GNU or OLDGNU format is allowed, use '\200' followed by base-256, or (if NEGATIVE is nonzero) '\377' followed by two's complement base-256. If neither format works, use SUBSTITUTE (...) instead. Pass to SUBSTITUTE the address of an 0-or-1 flag recording whether the substitute value is negative. */ static bool to_chars (int negative, uintmax_t value, size_t valsize, uintmax_t (*substitute) (int *), char *where, size_t size, const char *type) { int gnu_format = (archive_format == GNU_FORMAT || archive_format == OLDGNU_FORMAT); /* Generate the POSIX octal representation if the number fits. */ if (! negative && value <= MAX_VAL_WITH_DIGITS (size - 1, LG_8)) { where[size - 1] = '\0'; to_octal (value, where, size - 1); return true; } else if (gnu_format) { /* Try to cope with the number by using traditional GNU format methods */ /* Generate the base-256 representation if the number fits. */ if (((negative ? -1 - value : value) <= MAX_VAL_WITH_DIGITS (size - 1, LG_256))) { where[0] = negative ? -1 : 1 << (LG_256 - 1); to_base256 (negative, value, where + 1, size - 1); return true; } /* Otherwise, if the number is negative, and if it would not cause ambiguity on this host by confusing positive with negative values, then generate the POSIX octal representation of the value modulo 2**(field bits). The resulting tar file is machine-dependent, since it depends on the host word size. Yuck! But this is the traditional behavior. */ else if (negative && valsize * CHAR_BIT <= (size - 1) * LG_8) { static int warned_once; if (! warned_once) { warned_once = 1; WARN ((0, 0, _("Generating negative octal headers"))); } where[size - 1] = '\0'; to_octal (value & MAX_VAL_WITH_DIGITS (valsize * CHAR_BIT, 1), where, size - 1); return true; } /* Otherwise fall back to substitution, if possible: */ } else substitute = NULL; /* No substitution for formats, other than GNU */ return to_chars_subst (negative, gnu_format, value, valsize, substitute, where, size, type); } static uintmax_t gid_substitute (int *negative) { gid_t r; #ifdef GID_NOBODY r = GID_NOBODY; #else static gid_t gid_nobody; if (!gid_nobody && !gname_to_gid ("nobody", &gid_nobody)) gid_nobody = -2; r = gid_nobody; #endif *negative = r < 0; return r; } static bool gid_to_chars (gid_t v, char *p, size_t s) { return to_chars (v < 0, (uintmax_t) v, sizeof v, gid_substitute, p, s, "gid_t"); } static bool major_to_chars (major_t v, char *p, size_t s) { return to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "major_t"); } static bool minor_to_chars (minor_t v, char *p, size_t s) { return to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "minor_t"); } static bool mode_to_chars (mode_t v, char *p, size_t s) { /* In the common case where the internal and external mode bits are the same, and we are not using POSIX or GNU format, propagate all unknown bits to the external mode. This matches historical practice. Otherwise, just copy the bits we know about. */ int negative; uintmax_t u; if (S_ISUID == TSUID && S_ISGID == TSGID && S_ISVTX == TSVTX && S_IRUSR == TUREAD && S_IWUSR == TUWRITE && S_IXUSR == TUEXEC && S_IRGRP == TGREAD && S_IWGRP == TGWRITE && S_IXGRP == TGEXEC && S_IROTH == TOREAD && S_IWOTH == TOWRITE && S_IXOTH == TOEXEC && archive_format != POSIX_FORMAT && archive_format != USTAR_FORMAT && archive_format != GNU_FORMAT) { negative = v < 0; u = v; } else { negative = 0; u = ((v & S_ISUID ? TSUID : 0) | (v & S_ISGID ? TSGID : 0) | (v & S_ISVTX ? TSVTX : 0) | (v & S_IRUSR ? TUREAD : 0) | (v & S_IWUSR ? TUWRITE : 0) | (v & S_IXUSR ? TUEXEC : 0) | (v & S_IRGRP ? TGREAD : 0) | (v & S_IWGRP ? TGWRITE : 0) | (v & S_IXGRP ? TGEXEC : 0) | (v & S_IROTH ? TOREAD : 0) | (v & S_IWOTH ? TOWRITE : 0) | (v & S_IXOTH ? TOEXEC : 0)); } return to_chars (negative, u, sizeof v, 0, p, s, "mode_t"); } bool off_to_chars (off_t v, char *p, size_t s) { return to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "off_t"); } bool time_to_chars (time_t v, char *p, size_t s) { return to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "time_t"); } static uintmax_t uid_substitute (int *negative) { uid_t r; #ifdef UID_NOBODY r = UID_NOBODY; #else static uid_t uid_nobody; if (!uid_nobody && !uname_to_uid ("nobody", &uid_nobody)) uid_nobody = -2; r = uid_nobody; #endif *negative = r < 0; return r; } static bool uid_to_chars (uid_t v, char *p, size_t s) { return to_chars (v < 0, (uintmax_t) v, sizeof v, uid_substitute, p, s, "uid_t"); } static bool uintmax_to_chars (uintmax_t v, char *p, size_t s) { return to_chars (0, v, sizeof v, 0, p, s, "uintmax_t"); } static void string_to_chars (char const *str, char *p, size_t s) { tar_copy_str (p, str, s); p[s - 1] = '\0'; } /* A directory is always considered dumpable. Otherwise, only regular and contiguous files are considered dumpable. Such a file is dumpable if it is sparse and both --sparse and --totals are specified. Otherwise, it is dumpable unless any of the following conditions occur: a) it is empty *and* world-readable, or b) current archive is /dev/null */ static bool file_dumpable_p (struct stat const *st) { if (S_ISDIR (st->st_mode)) return true; if (! (S_ISREG (st->st_mode) || S_ISCTG (st->st_mode))) return false; if (dev_null_output) return totals_option && sparse_option && ST_IS_SPARSE (*st); return ! (st->st_size == 0 && (st->st_mode & MODE_R) == MODE_R); } /* Writing routines. */ /* Write the EOT block(s). Zero at least two blocks, through the end of the record. Old tar, as previous versions of GNU tar, writes garbage after two zeroed blocks. */ void write_eot (void) { union block *pointer = find_next_block (); memset (pointer->buffer, 0, BLOCKSIZE); set_next_block_after (pointer); pointer = find_next_block (); memset (pointer->buffer, 0, available_space_after (pointer)); set_next_block_after (pointer); } /* Write a "private" header */ union block * start_private_header (const char *name, size_t size, time_t t) { union block *header = find_next_block (); memset (header->buffer, 0, sizeof (union block)); tar_name_copy_str (header->header.name, name, NAME_FIELD_SIZE); OFF_TO_CHARS (size, header->header.size); TIME_TO_CHARS (t < 0 ? 0 : min (t, MAX_OCTAL_VAL (header->header.mtime)), header->header.mtime); MODE_TO_CHARS (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, header->header.mode); UID_TO_CHARS (0, header->header.uid); GID_TO_CHARS (0, header->header.gid); strncpy (header->header.magic, TMAGIC, TMAGLEN); strncpy (header->header.version, TVERSION, TVERSLEN); return header; } /* Create a new header and store there at most NAME_FIELD_SIZE bytes of the file name */ static union block * write_short_name (struct tar_stat_info *st) { union block *header = find_next_block (); memset (header->buffer, 0, sizeof (union block)); tar_name_copy_str (header->header.name, st->file_name, NAME_FIELD_SIZE); return header; } /* Write a GNUTYPE_LONGLINK or GNUTYPE_LONGNAME block. */ static void write_gnu_long_link (struct tar_stat_info *st, const char *p, char type) { size_t size = strlen (p) + 1; size_t bufsize; union block *header; header = start_private_header ("././@LongLink", size, 0); if (! numeric_owner_option) { static char *uname, *gname; if (!uname) { uid_to_uname (0, &uname); gid_to_gname (0, &gname); } UNAME_TO_CHARS (uname, header->header.uname); GNAME_TO_CHARS (gname, header->header.gname); } strcpy (header->buffer + offsetof (struct posix_header, magic), OLDGNU_MAGIC); header->header.typeflag = type; finish_header (st, header, -1); header = find_next_block (); bufsize = available_space_after (header); while (bufsize < size) { memcpy (header->buffer, p, bufsize); p += bufsize; size -= bufsize; set_next_block_after (header + (bufsize - 1) / BLOCKSIZE); header = find_next_block (); bufsize = available_space_after (header); } memcpy (header->buffer, p, size); memset (header->buffer + size, 0, bufsize - size); set_next_block_after (header + (size - 1) / BLOCKSIZE); } static size_t split_long_name (const char *name, size_t length) { size_t i; if (length > PREFIX_FIELD_SIZE + 1) length = PREFIX_FIELD_SIZE + 1; else if (ISSLASH (name[length - 1])) length--; for (i = length - 1; i > 0; i--) if (ISSLASH (name[i])) break; return i; } static union block * write_ustar_long_name (const char *name) { size_t length = strlen (name); size_t i, nlen; union block *header; if (length > PREFIX_FIELD_SIZE + NAME_FIELD_SIZE + 1) { ERROR ((0, 0, _("%s: file name is too long (max %d); not dumped"), quotearg_colon (name), PREFIX_FIELD_SIZE + NAME_FIELD_SIZE + 1)); return NULL; } i = split_long_name (name, length); if (i == 0 || (nlen = length - i - 1) > NAME_FIELD_SIZE || nlen == 0) { ERROR ((0, 0, _("%s: file name is too long (cannot be split); not dumped"), quotearg_colon (name))); return NULL; } header = find_next_block (); memset (header->buffer, 0, sizeof (header->buffer)); memcpy (header->header.prefix, name, i); memcpy (header->header.name, name + i + 1, length - i - 1); return header; } /* Write a long link name, depending on the current archive format */ static void write_long_link (struct tar_stat_info *st) { switch (archive_format) { case POSIX_FORMAT: xheader_store ("linkpath", st, NULL); break; case V7_FORMAT: /* old V7 tar format */ case USTAR_FORMAT: case STAR_FORMAT: ERROR ((0, 0, _("%s: link name is too long; not dumped"), quotearg_colon (st->link_name))); break; case OLDGNU_FORMAT: case GNU_FORMAT: write_gnu_long_link (st, st->link_name, GNUTYPE_LONGLINK); break; default: abort(); /*FIXME*/ } } static union block * write_long_name (struct tar_stat_info *st) { switch (archive_format) { case POSIX_FORMAT: xheader_store ("path", st, NULL); break; case V7_FORMAT: if (strlen (st->file_name) > NAME_FIELD_SIZE-1) { ERROR ((0, 0, _("%s: file name is too long (max %d); not dumped"), quotearg_colon (st->file_name), NAME_FIELD_SIZE - 1)); return NULL; } break; case USTAR_FORMAT: case STAR_FORMAT: return write_ustar_long_name (st->file_name); case OLDGNU_FORMAT: case GNU_FORMAT: write_gnu_long_link (st, st->file_name, GNUTYPE_LONGNAME); break; default: abort(); /*FIXME*/ } return write_short_name (st); } union block * write_extended (bool global, struct tar_stat_info *st, union block *old_header) { union block *header, hp; char *p; int type; time_t t; if (st->xhdr.buffer || st->xhdr.stk == NULL) return old_header; xheader_finish (&st->xhdr); memcpy (hp.buffer, old_header, sizeof (hp)); if (global) { type = XGLTYPE; p = xheader_ghdr_name (); t = start_time.tv_sec; } else { type = XHDTYPE; p = xheader_xhdr_name (st); t = set_mtime_option ? mtime_option.tv_sec : st->stat.st_mtime; } xheader_write (type, p, t, &st->xhdr); free (p); header = find_next_block (); memcpy (header, &hp.buffer, sizeof (hp.buffer)); return header; } static union block * write_header_name (struct tar_stat_info *st) { if (archive_format == POSIX_FORMAT && !string_ascii_p (st->file_name)) { xheader_store ("path", st, NULL); return write_short_name (st); } else if (NAME_FIELD_SIZE - (archive_format == OLDGNU_FORMAT) < strlen (st->file_name)) return write_long_name (st); else return write_short_name (st); } /* Header handling. */ /* Make a header block for the file whose stat info is st, and return its address. */ union block * start_header (struct tar_stat_info *st) { union block *header; char const *uname = NULL; char const *gname = NULL; header = write_header_name (st); if (!header) return NULL; /* Override some stat fields, if requested to do so. */ owner_map_translate (st->stat.st_uid, &st->stat.st_uid, &uname); group_map_translate (st->stat.st_gid, &st->stat.st_gid, &gname); if (mode_option) st->stat.st_mode = ((st->stat.st_mode & ~MODE_ALL) | mode_adjust (st->stat.st_mode, S_ISDIR (st->stat.st_mode) != 0, initial_umask, mode_option, NULL)); /* Paul Eggert tried the trivial test ($WRITER cf a b; $READER tvf a) for a few tars and came up with the following interoperability matrix: WRITER 1 2 3 4 5 6 7 8 9 READER . . . . . . . . . 1 = SunOS 4.2 tar # . . # # . . # # 2 = NEC SVR4.0.2 tar . . . # # . . # . 3 = Solaris 2.1 tar . . . . . . . . . 4 = GNU tar 1.11.1 . . . . . . . . . 5 = HP-UX 8.07 tar . . . . . . . . . 6 = Ultrix 4.1 . . . . . . . . . 7 = AIX 3.2 . . . . . . . . . 8 = Hitachi HI-UX 1.03 . . . . . . . . . 9 = Omron UNIOS-B 4.3BSD 1.60Beta . = works # = "impossible file type" The following mask for old archive removes the '#'s in column 4 above, thus making GNU tar both a universal donor and a universal acceptor for Paul's test. */ if (archive_format == V7_FORMAT || archive_format == USTAR_FORMAT) MODE_TO_CHARS (st->stat.st_mode & MODE_ALL, header->header.mode); else MODE_TO_CHARS (st->stat.st_mode, header->header.mode); { uid_t uid = st->stat.st_uid; if (archive_format == POSIX_FORMAT && MAX_OCTAL_VAL (header->header.uid) < uid) { xheader_store ("uid", st, NULL); uid = 0; } if (!UID_TO_CHARS (uid, header->header.uid)) return NULL; } { gid_t gid = st->stat.st_gid; if (archive_format == POSIX_FORMAT && MAX_OCTAL_VAL (header->header.gid) < gid) { xheader_store ("gid", st, NULL); gid = 0; } if (!GID_TO_CHARS (gid, header->header.gid)) return NULL; } { off_t size = st->stat.st_size; if (archive_format == POSIX_FORMAT && MAX_OCTAL_VAL (header->header.size) < size) { xheader_store ("size", st, NULL); size = 0; } if (!OFF_TO_CHARS (size, header->header.size)) return NULL; } { struct timespec mtime; switch (set_mtime_option) { case USE_FILE_MTIME: mtime = st->mtime; break; case FORCE_MTIME: mtime = mtime_option; break; case CLAMP_MTIME: mtime = timespec_cmp (st->mtime, mtime_option) > 0 ? mtime_option : st->mtime; break; } if (archive_format == POSIX_FORMAT) { if (MAX_OCTAL_VAL (header->header.mtime) < mtime.tv_sec || mtime.tv_nsec != 0) xheader_store ("mtime", st, &mtime); if (MAX_OCTAL_VAL (header->header.mtime) < mtime.tv_sec) mtime.tv_sec = 0; } if (!TIME_TO_CHARS (mtime.tv_sec, header->header.mtime)) return NULL; } /* FIXME */ if (S_ISCHR (st->stat.st_mode) || S_ISBLK (st->stat.st_mode)) { major_t devmajor = major (st->stat.st_rdev); minor_t devminor = minor (st->stat.st_rdev); if (archive_format == POSIX_FORMAT && MAX_OCTAL_VAL (header->header.devmajor) < devmajor) { xheader_store ("devmajor", st, NULL); devmajor = 0; } if (!MAJOR_TO_CHARS (devmajor, header->header.devmajor)) return NULL; if (archive_format == POSIX_FORMAT && MAX_OCTAL_VAL (header->header.devminor) < devminor) { xheader_store ("devminor", st, NULL); devminor = 0; } if (!MINOR_TO_CHARS (devminor, header->header.devminor)) return NULL; } else if (archive_format != GNU_FORMAT && archive_format != OLDGNU_FORMAT) { if (!(MAJOR_TO_CHARS (0, header->header.devmajor) && MINOR_TO_CHARS (0, header->header.devminor))) return NULL; } if (archive_format == POSIX_FORMAT) { xheader_store ("atime", st, NULL); xheader_store ("ctime", st, NULL); } else if (incremental_option) if (archive_format == OLDGNU_FORMAT || archive_format == GNU_FORMAT) { TIME_TO_CHARS (st->atime.tv_sec, header->oldgnu_header.atime); TIME_TO_CHARS (st->ctime.tv_sec, header->oldgnu_header.ctime); } header->header.typeflag = archive_format == V7_FORMAT ? AREGTYPE : REGTYPE; switch (archive_format) { case V7_FORMAT: break; case OLDGNU_FORMAT: case GNU_FORMAT: /*FIXME?*/ /* Overwrite header->header.magic and header.version in one blow. */ strcpy (header->buffer + offsetof (struct posix_header, magic), OLDGNU_MAGIC); break; case POSIX_FORMAT: case USTAR_FORMAT: strncpy (header->header.magic, TMAGIC, TMAGLEN); strncpy (header->header.version, TVERSION, TVERSLEN); break; default: abort (); } if (archive_format == V7_FORMAT || numeric_owner_option) { /* header->header.[ug]name are left as the empty string. */ } else { if (uname) st->uname = xstrdup (uname); else uid_to_uname (st->stat.st_uid, &st->uname); if (gname) st->gname = xstrdup (gname); else gid_to_gname (st->stat.st_gid, &st->gname); if (archive_format == POSIX_FORMAT && (strlen (st->uname) > UNAME_FIELD_SIZE || !string_ascii_p (st->uname))) xheader_store ("uname", st, NULL); UNAME_TO_CHARS (st->uname, header->header.uname); if (archive_format == POSIX_FORMAT && (strlen (st->gname) > GNAME_FIELD_SIZE || !string_ascii_p (st->gname))) xheader_store ("gname", st, NULL); GNAME_TO_CHARS (st->gname, header->header.gname); } if (archive_format == POSIX_FORMAT) { if (acls_option > 0) { if (st->acls_a_ptr) xheader_store ("SCHILY.acl.access", st, NULL); if (st->acls_d_ptr) xheader_store ("SCHILY.acl.default", st, NULL); } if ((selinux_context_option > 0) && st->cntx_name) xheader_store ("RHT.security.selinux", st, NULL); if (xattrs_option > 0) { size_t scan_xattr = 0; struct xattr_array *xattr_map = st->xattr_map; while (scan_xattr < st->xattr_map_size) { xheader_store (xattr_map[scan_xattr].xkey, st, &scan_xattr); ++scan_xattr; } } } return header; } void simple_finish_header (union block *header) { size_t i; int sum; char *p; memcpy (header->header.chksum, CHKBLANKS, sizeof header->header.chksum); sum = 0; p = header->buffer; for (i = sizeof *header; i-- != 0; ) /* We can't use unsigned char here because of old compilers, e.g. V7. */ sum += 0xFF & *p++; /* Fill in the checksum field. It's formatted differently from the other fields: it has [6] digits, a null, then a space -- rather than |
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