1/*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "bsdtar_platform.h" 27__FBSDID("$FreeBSD: src/usr.bin/tar/write.c,v 1.79 2008/11/27 05:49:52 kientzle Exp $"); 28 29#ifdef HAVE_SYS_TYPES_H 30#include <sys/types.h> 31#endif 32#ifdef HAVE_SYS_IOCTL_H 33#include <sys/ioctl.h> 34#endif 35#ifdef HAVE_SYS_STAT_H 36#include <sys/stat.h> 37#endif 38#ifdef HAVE_ATTR_XATTR_H 39#include <attr/xattr.h> 40#endif 41#ifdef HAVE_ERRNO_H 42#include <errno.h> 43#endif 44#ifdef HAVE_FCNTL_H 45#include <fcntl.h> 46#endif 47#ifdef HAVE_GRP_H 48#include <grp.h> 49#endif 50#ifdef HAVE_IO_H 51#include <io.h> 52#endif 53#ifdef HAVE_LIMITS_H 54#include <limits.h> 55#endif 56#ifdef HAVE_LINUX_FS_H 57#include <linux/fs.h> /* for Linux file flags */ 58#endif 59/* 60 * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h. 61 * As the include guards don't agree, the order of include is important. 62 */ 63#ifdef HAVE_LINUX_EXT2_FS_H 64#include <linux/ext2_fs.h> /* for Linux file flags */ 65#endif 66#if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__) 67/* This header exists but is broken on Cygwin. */ 68#include <ext2fs/ext2_fs.h> 69#endif 70#ifdef HAVE_PWD_H 71#include <pwd.h> 72#endif 73#ifdef HAVE_STDINT_H 74#include <stdint.h> 75#endif 76#include <stdio.h> 77#ifdef HAVE_STDLIB_H 78#include <stdlib.h> 79#endif 80#ifdef HAVE_STRING_H 81#include <string.h> 82#endif 83#ifdef HAVE_UNISTD_H 84#include <unistd.h> 85#endif 86 87#include "bsdtar.h" 88#include "err.h" 89#include "line_reader.h" 90#include "tree.h" 91 92/* Size of buffer for holding file data prior to writing. */ 93#define FILEDATABUFLEN 65536 94 95/* Fixed size of uname/gname caches. */ 96#define name_cache_size 101 97 98#ifndef O_BINARY 99#define O_BINARY 0 100#endif 101 102static const char * const NO_NAME = "(noname)"; 103 104struct archive_dir_entry { 105 struct archive_dir_entry *next; 106 time_t mtime_sec; 107 int mtime_nsec; 108 char *name; 109}; 110 111struct archive_dir { 112 struct archive_dir_entry *head, *tail; 113}; 114 115struct name_cache { 116 int probes; 117 int hits; 118 size_t size; 119 struct { 120 id_t id; 121 const char *name; 122 } cache[name_cache_size]; 123}; 124 125static void add_dir_list(struct bsdtar *bsdtar, const char *path, 126 time_t mtime_sec, int mtime_nsec); 127static int append_archive(struct bsdtar *, struct archive *, 128 struct archive *ina); 129static int append_archive_filename(struct bsdtar *, 130 struct archive *, const char *fname); 131static void archive_names_from_file(struct bsdtar *bsdtar, 132 struct archive *a); 133static int copy_file_data(struct bsdtar *, struct archive *a, 134 struct archive *ina, struct archive_entry *); 135static int new_enough(struct bsdtar *, const char *path, 136 const struct stat *); 137static void report_write(struct bsdtar *, struct archive *, 138 struct archive_entry *, int64_t progress); 139static void test_for_append(struct bsdtar *); 140static void write_archive(struct archive *, struct bsdtar *); 141static void write_entry_backend(struct bsdtar *, struct archive *, 142 struct archive_entry *); 143static int write_file_data(struct bsdtar *, struct archive *, 144 struct archive_entry *, int fd); 145static void write_hierarchy(struct bsdtar *, struct archive *, 146 const char *); 147 148#if defined(_WIN32) && !defined(__CYGWIN__) 149/* Not a full lseek() emulation, but enough for our needs here. */ 150static int 151seek_file(int fd, int64_t offset, int whence) 152{ 153 LARGE_INTEGER distance; 154 (void)whence; /* UNUSED */ 155 distance.QuadPart = offset; 156 return (SetFilePointerEx((HANDLE)_get_osfhandle(fd), 157 distance, NULL, FILE_BEGIN) ? 1 : -1); 158} 159#define open _open 160#define close _close 161#define read _read 162#define lseek seek_file 163#endif 164 165void 166tar_mode_c(struct bsdtar *bsdtar) 167{ 168 struct archive *a; 169 int r; 170 171 if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL) 172 lafe_errc(1, 0, "no files or directories specified"); 173 174 a = archive_write_new(); 175 176 /* Support any format that the library supports. */ 177 if (bsdtar->create_format == NULL) { 178 r = archive_write_set_format_pax_restricted(a); 179 bsdtar->create_format = "pax restricted"; 180 } else { 181 r = archive_write_set_format_by_name(a, bsdtar->create_format); 182 } 183 if (r != ARCHIVE_OK) { 184 fprintf(stderr, "Can't use format %s: %s\n", 185 bsdtar->create_format, 186 archive_error_string(a)); 187 usage(); 188 } 189 190 /* 191 * If user explicitly set the block size, then assume they 192 * want the last block padded as well. Otherwise, use the 193 * default block size and accept archive_write_open_file()'s 194 * default padding decisions. 195 */ 196 if (bsdtar->bytes_per_block != 0) { 197 archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block); 198 archive_write_set_bytes_in_last_block(a, 199 bsdtar->bytes_per_block); 200 } else 201 archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK); 202 203 if (bsdtar->compress_program) { 204 archive_write_set_compression_program(a, bsdtar->compress_program); 205 } else { 206 switch (bsdtar->create_compression) { 207 case 0: 208 r = archive_write_set_compression_none(a); 209 break; 210 case 'j': case 'y': 211 r = archive_write_set_compression_bzip2(a); 212 break; 213 case 'J': 214 r = archive_write_set_compression_xz(a); 215 break; 216 case OPTION_LZMA: 217 r = archive_write_set_compression_lzma(a); 218 break; 219 case 'z': 220 r = archive_write_set_compression_gzip(a); 221 break; 222 case 'Z': 223 r = archive_write_set_compression_compress(a); 224 break; 225 default: 226 lafe_errc(1, 0, 227 "Unrecognized compression option -%c", 228 bsdtar->create_compression); 229 } 230 if (r != ARCHIVE_OK) { 231 lafe_errc(1, 0, 232 "Unsupported compression option -%c", 233 bsdtar->create_compression); 234 } 235 } 236 237 if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options)) 238 lafe_errc(1, 0, "%s", archive_error_string(a)); 239 if (ARCHIVE_OK != archive_write_open_file(a, bsdtar->filename)) 240 lafe_errc(1, 0, "%s", archive_error_string(a)); 241 write_archive(a, bsdtar); 242} 243 244/* 245 * Same as 'c', except we only support tar or empty formats in 246 * uncompressed files on disk. 247 */ 248void 249tar_mode_r(struct bsdtar *bsdtar) 250{ 251 int64_t end_offset; 252 int format; 253 struct archive *a; 254 struct archive_entry *entry; 255 int r; 256 257 /* Sanity-test some arguments and the file. */ 258 test_for_append(bsdtar); 259 260 format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; 261 262#if defined(__BORLANDC__) 263 bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY); 264#else 265 bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY, 0666); 266#endif 267 if (bsdtar->fd < 0) 268 lafe_errc(1, errno, 269 "Cannot open %s", bsdtar->filename); 270 271 a = archive_read_new(); 272 archive_read_support_compression_all(a); 273 archive_read_support_format_tar(a); 274 archive_read_support_format_gnutar(a); 275 r = archive_read_open_fd(a, bsdtar->fd, 10240); 276 if (r != ARCHIVE_OK) 277 lafe_errc(1, archive_errno(a), 278 "Can't read archive %s: %s", bsdtar->filename, 279 archive_error_string(a)); 280 while (0 == archive_read_next_header(a, &entry)) { 281 if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) { 282 archive_read_finish(a); 283 close(bsdtar->fd); 284 lafe_errc(1, 0, 285 "Cannot append to compressed archive."); 286 } 287 /* Keep going until we hit end-of-archive */ 288 format = archive_format(a); 289 } 290 291 end_offset = archive_read_header_position(a); 292 archive_read_finish(a); 293 294 /* Re-open archive for writing */ 295 a = archive_write_new(); 296 archive_write_set_compression_none(a); 297 /* 298 * Set the format to be used for writing. To allow people to 299 * extend empty files, we need to allow them to specify the format, 300 * which opens the possibility that they will specify a format that 301 * doesn't match the existing format. Hence, the following bit 302 * of arcane ugliness. 303 */ 304 305 if (bsdtar->create_format != NULL) { 306 /* If the user requested a format, use that, but ... */ 307 archive_write_set_format_by_name(a, 308 bsdtar->create_format); 309 /* ... complain if it's not compatible. */ 310 format &= ARCHIVE_FORMAT_BASE_MASK; 311 if (format != (int)(archive_format(a) & ARCHIVE_FORMAT_BASE_MASK) 312 && format != ARCHIVE_FORMAT_EMPTY) { 313 lafe_errc(1, 0, 314 "Format %s is incompatible with the archive %s.", 315 bsdtar->create_format, bsdtar->filename); 316 } 317 } else { 318 /* 319 * Just preserve the current format, with a little care 320 * for formats that libarchive can't write. 321 */ 322 if (format == ARCHIVE_FORMAT_TAR_GNUTAR) 323 /* TODO: When gtar supports pax, use pax restricted. */ 324 format = ARCHIVE_FORMAT_TAR_USTAR; 325 if (format == ARCHIVE_FORMAT_EMPTY) 326 format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; 327 archive_write_set_format(a, format); 328 } 329 if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0) 330 lafe_errc(1, errno, "Could not seek to archive end"); 331 if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options)) 332 lafe_errc(1, 0, "%s", archive_error_string(a)); 333 if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd)) 334 lafe_errc(1, 0, "%s", archive_error_string(a)); 335 336 write_archive(a, bsdtar); /* XXX check return val XXX */ 337 338 close(bsdtar->fd); 339 bsdtar->fd = -1; 340} 341 342void 343tar_mode_u(struct bsdtar *bsdtar) 344{ 345 int64_t end_offset; 346 struct archive *a; 347 struct archive_entry *entry; 348 int format; 349 struct archive_dir_entry *p; 350 struct archive_dir archive_dir; 351 352 bsdtar->archive_dir = &archive_dir; 353 memset(&archive_dir, 0, sizeof(archive_dir)); 354 355 format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; 356 357 /* Sanity-test some arguments and the file. */ 358 test_for_append(bsdtar); 359 360 bsdtar->fd = open(bsdtar->filename, O_RDWR | O_BINARY); 361 if (bsdtar->fd < 0) 362 lafe_errc(1, errno, 363 "Cannot open %s", bsdtar->filename); 364 365 a = archive_read_new(); 366 archive_read_support_compression_all(a); 367 archive_read_support_format_tar(a); 368 archive_read_support_format_gnutar(a); 369 if (archive_read_open_fd(a, bsdtar->fd, 370 bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block : 371 DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) { 372 lafe_errc(1, 0, 373 "Can't open %s: %s", bsdtar->filename, 374 archive_error_string(a)); 375 } 376 377 /* Build a list of all entries and their recorded mod times. */ 378 while (0 == archive_read_next_header(a, &entry)) { 379 if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) { 380 archive_read_finish(a); 381 close(bsdtar->fd); 382 lafe_errc(1, 0, 383 "Cannot append to compressed archive."); 384 } 385 add_dir_list(bsdtar, archive_entry_pathname(entry), 386 archive_entry_mtime(entry), 387 archive_entry_mtime_nsec(entry)); 388 /* Record the last format determination we see */ 389 format = archive_format(a); 390 /* Keep going until we hit end-of-archive */ 391 } 392 393 end_offset = archive_read_header_position(a); 394 archive_read_finish(a); 395 396 /* Re-open archive for writing. */ 397 a = archive_write_new(); 398 archive_write_set_compression_none(a); 399 /* 400 * Set format to same one auto-detected above, except that 401 * we don't write GNU tar format, so use ustar instead. 402 */ 403 if (format == ARCHIVE_FORMAT_TAR_GNUTAR) 404 format = ARCHIVE_FORMAT_TAR_USTAR; 405 archive_write_set_format(a, format); 406 if (bsdtar->bytes_per_block != 0) { 407 archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block); 408 archive_write_set_bytes_in_last_block(a, 409 bsdtar->bytes_per_block); 410 } else 411 archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK); 412 if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0) 413 lafe_errc(1, errno, "Could not seek to archive end"); 414 if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options)) 415 lafe_errc(1, 0, "%s", archive_error_string(a)); 416 if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd)) 417 lafe_errc(1, 0, "%s", archive_error_string(a)); 418 419 write_archive(a, bsdtar); 420 421 close(bsdtar->fd); 422 bsdtar->fd = -1; 423 424 while (bsdtar->archive_dir->head != NULL) { 425 p = bsdtar->archive_dir->head->next; 426 free(bsdtar->archive_dir->head->name); 427 free(bsdtar->archive_dir->head); 428 bsdtar->archive_dir->head = p; 429 } 430 bsdtar->archive_dir->tail = NULL; 431} 432 433 434/* 435 * Write user-specified files/dirs to opened archive. 436 */ 437static void 438write_archive(struct archive *a, struct bsdtar *bsdtar) 439{ 440 const char *arg; 441 struct archive_entry *entry, *sparse_entry; 442 443 /* Allocate a buffer for file data. */ 444 if ((bsdtar->buff = malloc(FILEDATABUFLEN)) == NULL) 445 lafe_errc(1, 0, "cannot allocate memory"); 446 447 if ((bsdtar->resolver = archive_entry_linkresolver_new()) == NULL) 448 lafe_errc(1, 0, "cannot create link resolver"); 449 archive_entry_linkresolver_set_strategy(bsdtar->resolver, 450 archive_format(a)); 451 if ((bsdtar->diskreader = archive_read_disk_new()) == NULL) 452 lafe_errc(1, 0, "Cannot create read_disk object"); 453 archive_read_disk_set_standard_lookup(bsdtar->diskreader); 454 455 if (bsdtar->names_from_file != NULL) 456 archive_names_from_file(bsdtar, a); 457 458 while (*bsdtar->argv) { 459 arg = *bsdtar->argv; 460 if (arg[0] == '-' && arg[1] == 'C') { 461 arg += 2; 462 if (*arg == '\0') { 463 bsdtar->argv++; 464 arg = *bsdtar->argv; 465 if (arg == NULL) { 466 lafe_warnc(0, "%s", 467 "Missing argument for -C"); 468 bsdtar->return_value = 1; 469 goto cleanup; 470 } 471 } 472 set_chdir(bsdtar, arg); 473 } else { 474 if (*arg != '/' && (arg[0] != '@' || arg[1] != '/')) 475 do_chdir(bsdtar); /* Handle a deferred -C */ 476 if (*arg == '@') { 477 if (append_archive_filename(bsdtar, a, 478 arg + 1) != 0) 479 break; 480 } else 481 write_hierarchy(bsdtar, a, arg); 482 } 483 bsdtar->argv++; 484 } 485 486 entry = NULL; 487 archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry); 488 while (entry != NULL) { 489 write_entry_backend(bsdtar, a, entry); 490 archive_entry_free(entry); 491 entry = NULL; 492 archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry); 493 } 494 495 if (archive_write_close(a)) { 496 lafe_warnc(0, "%s", archive_error_string(a)); 497 bsdtar->return_value = 1; 498 } 499 500cleanup: 501 /* Free file data buffer. */ 502 free(bsdtar->buff); 503 archive_entry_linkresolver_free(bsdtar->resolver); 504 bsdtar->resolver = NULL; 505 archive_read_finish(bsdtar->diskreader); 506 bsdtar->diskreader = NULL; 507 508 if (bsdtar->option_totals) { 509 fprintf(stderr, "Total bytes written: %s\n", 510 tar_i64toa(archive_position_compressed(a))); 511 } 512 513 archive_write_finish(a); 514} 515 516/* 517 * Archive names specified in file. 518 * 519 * Unless --null was specified, a line containing exactly "-C" will 520 * cause the next line to be a directory to pass to chdir(). If 521 * --null is specified, then a line "-C" is just another filename. 522 */ 523static void 524archive_names_from_file(struct bsdtar *bsdtar, struct archive *a) 525{ 526 struct lafe_line_reader *lr; 527 const char *line; 528 529 bsdtar->next_line_is_dir = 0; 530 531 lr = lafe_line_reader(bsdtar->names_from_file, bsdtar->option_null); 532 while ((line = lafe_line_reader_next(lr)) != NULL) { 533 if (bsdtar->next_line_is_dir) { 534 set_chdir(bsdtar, line); 535 bsdtar->next_line_is_dir = 0; 536 } else if (!bsdtar->option_null && strcmp(line, "-C") == 0) 537 bsdtar->next_line_is_dir = 1; 538 else { 539 if (*line != '/') 540 do_chdir(bsdtar); /* Handle a deferred -C */ 541 write_hierarchy(bsdtar, a, line); 542 } 543 } 544 lafe_line_reader_free(lr); 545 if (bsdtar->next_line_is_dir) 546 lafe_errc(1, errno, 547 "Unexpected end of filename list; " 548 "directory expected after -C"); 549} 550 551/* 552 * Copy from specified archive to current archive. Returns non-zero 553 * for write errors (which force us to terminate the entire archiving 554 * operation). If there are errors reading the input archive, we set 555 * bsdtar->return_value but return zero, so the overall archiving 556 * operation will complete and return non-zero. 557 */ 558static int 559append_archive_filename(struct bsdtar *bsdtar, struct archive *a, 560 const char *filename) 561{ 562 struct archive *ina; 563 int rc; 564 565 if (strcmp(filename, "-") == 0) 566 filename = NULL; /* Library uses NULL for stdio. */ 567 568 ina = archive_read_new(); 569 archive_read_support_format_all(ina); 570 archive_read_support_compression_all(ina); 571 if (archive_read_open_file(ina, filename, 10240)) { 572 lafe_warnc(0, "%s", archive_error_string(ina)); 573 bsdtar->return_value = 1; 574 return (0); 575 } 576 577 rc = append_archive(bsdtar, a, ina); 578 579 if (rc != ARCHIVE_OK) { 580 lafe_warnc(0, "Error reading archive %s: %s", 581 filename, archive_error_string(ina)); 582 bsdtar->return_value = 1; 583 } 584 archive_read_finish(ina); 585 586 return (rc); 587} 588 589static int 590append_archive(struct bsdtar *bsdtar, struct archive *a, struct archive *ina) 591{ 592 struct archive_entry *in_entry; 593 int e; 594 595 while (0 == archive_read_next_header(ina, &in_entry)) { 596 if (!new_enough(bsdtar, archive_entry_pathname(in_entry), 597 archive_entry_stat(in_entry))) 598 continue; 599 if (lafe_excluded(bsdtar->matching, archive_entry_pathname(in_entry))) 600 continue; 601 if (bsdtar->option_interactive && 602 !yes("copy '%s'", archive_entry_pathname(in_entry))) 603 continue; 604 if (bsdtar->verbose) 605 safe_fprintf(stderr, "a %s", 606 archive_entry_pathname(in_entry)); 607 if (need_report()) 608 report_write(bsdtar, a, in_entry, 0); 609 610 e = archive_write_header(a, in_entry); 611 if (e != ARCHIVE_OK) { 612 if (!bsdtar->verbose) 613 lafe_warnc(0, "%s: %s", 614 archive_entry_pathname(in_entry), 615 archive_error_string(a)); 616 else 617 fprintf(stderr, ": %s", archive_error_string(a)); 618 } 619 if (e == ARCHIVE_FATAL) 620 exit(1); 621 622 if (e >= ARCHIVE_WARN) { 623 if (archive_entry_size(in_entry) == 0) 624 archive_read_data_skip(ina); 625 else if (copy_file_data(bsdtar, a, ina, in_entry)) 626 exit(1); 627 } 628 629 if (bsdtar->verbose) 630 fprintf(stderr, "\n"); 631 } 632 633 /* Note: If we got here, we saw no write errors, so return success. */ 634 return (0); 635} 636 637/* Helper function to copy data between archives. */ 638static int 639copy_file_data(struct bsdtar *bsdtar, struct archive *a, 640 struct archive *ina, struct archive_entry *entry) 641{ 642 ssize_t bytes_read; 643 ssize_t bytes_written; 644 int64_t progress = 0; 645 646 bytes_read = archive_read_data(ina, bsdtar->buff, FILEDATABUFLEN); 647 while (bytes_read > 0) { 648 if (need_report()) 649 report_write(bsdtar, a, entry, progress); 650 651 bytes_written = archive_write_data(a, bsdtar->buff, 652 bytes_read); 653 if (bytes_written < bytes_read) { 654 lafe_warnc(0, "%s", archive_error_string(a)); 655 return (-1); 656 } 657 progress += bytes_written; 658 bytes_read = archive_read_data(ina, bsdtar->buff, 659 FILEDATABUFLEN); 660 } 661 662 return (0); 663} 664 665/* 666 * Add the file or dir hierarchy named by 'path' to the archive 667 */ 668static void 669write_hierarchy(struct bsdtar *bsdtar, struct archive *a, const char *path) 670{ 671 struct archive_entry *entry = NULL, *spare_entry = NULL; 672 struct tree *tree; 673 char symlink_mode = bsdtar->symlink_mode; 674 dev_t first_dev = 0; 675 int dev_recorded = 0; 676 int tree_ret; 677 678 tree = tree_open(path); 679 680 if (!tree) { 681 lafe_warnc(errno, "%s: Cannot open", path); 682 bsdtar->return_value = 1; 683 return; 684 } 685 686 while ((tree_ret = tree_next(tree)) != 0) { 687 int r; 688 const char *name = tree_current_path(tree); 689 const struct stat *st = NULL; /* info to use for this entry */ 690 const struct stat *lst = NULL; /* lstat() information */ 691 int descend; 692 693 if (tree_ret == TREE_ERROR_FATAL) 694 lafe_errc(1, tree_errno(tree), 695 "%s: Unable to continue traversing directory tree", 696 name); 697 if (tree_ret == TREE_ERROR_DIR) { 698 lafe_warnc(errno, 699 "%s: Couldn't visit directory", name); 700 bsdtar->return_value = 1; 701 } 702 if (tree_ret != TREE_REGULAR) 703 continue; 704 705 /* 706 * If this file/dir is excluded by a filename 707 * pattern, skip it. 708 */ 709 if (lafe_excluded(bsdtar->matching, name)) 710 continue; 711 712 /* 713 * Get lstat() info from the tree library. 714 */ 715 lst = tree_current_lstat(tree); 716 if (lst == NULL) { 717 /* Couldn't lstat(); must not exist. */ 718 lafe_warnc(errno, "%s: Cannot stat", name); 719 /* Return error if files disappear during traverse. */ 720 bsdtar->return_value = 1; 721 continue; 722 } 723 724 /* 725 * Distinguish 'L'/'P'/'H' symlink following. 726 */ 727 switch(symlink_mode) { 728 case 'H': 729 /* 'H': After the first item, rest like 'P'. */ 730 symlink_mode = 'P'; 731 /* 'H': First item (from command line) like 'L'. */ 732 /* FALLTHROUGH */ 733 case 'L': 734 /* 'L': Do descend through a symlink to dir. */ 735 descend = tree_current_is_dir(tree); 736 /* 'L': Follow symlinks to files. */ 737 archive_read_disk_set_symlink_logical(bsdtar->diskreader); 738 /* 'L': Archive symlinks as targets, if we can. */ 739 st = tree_current_stat(tree); 740 if (st != NULL) 741 break; 742 /* If stat fails, we have a broken symlink; 743 * in that case, don't follow the link. */ 744 /* FALLTHROUGH */ 745 default: 746 /* 'P': Don't descend through a symlink to dir. */ 747 descend = tree_current_is_physical_dir(tree); 748 /* 'P': Don't follow symlinks to files. */ 749 archive_read_disk_set_symlink_physical(bsdtar->diskreader); 750 /* 'P': Archive symlinks as symlinks. */ 751 st = lst; 752 break; 753 } 754 755 /* 756 * Are we about to cross to a new filesystem? 757 */ 758 if (!dev_recorded) { 759 /* This is the initial file system. */ 760 first_dev = lst->st_dev; 761 dev_recorded = 1; 762 } else if (lst->st_dev == first_dev) { 763 /* The starting file system is always acceptable. */ 764 } else if (descend == 0) { 765 /* We're not descending, so no need to check. */ 766 } else if (bsdtar->option_dont_traverse_mounts) { 767 /* User has asked us not to cross mount points. */ 768 descend = 0; 769 } else { 770 /* We're prepared to cross a mount point. */ 771 772 /* XXX TODO: check whether this filesystem is 773 * synthetic and/or local. Add a new 774 * --local-only option to skip non-local 775 * filesystems. Skip synthetic filesystems 776 * regardless. 777 * 778 * The results should be cached, since 779 * tree.c doesn't usually visit a directory 780 * and the directory contents together. A simple 781 * move-to-front list should perform quite well. 782 * 783 * This is going to be heavily OS dependent: 784 * FreeBSD's statfs() in conjunction with getvfsbyname() 785 * provides all of this; NetBSD's statvfs() does 786 * most of it; other systems will vary. 787 */ 788 } 789 790 /* 791 * In -u mode, check that the file is newer than what's 792 * already in the archive; in all modes, obey --newerXXX flags. 793 */ 794 if (!new_enough(bsdtar, name, st)) 795 continue; 796 797 archive_entry_free(entry); 798 entry = archive_entry_new(); 799 800 archive_entry_set_pathname(entry, name); 801 archive_entry_copy_sourcepath(entry, 802 tree_current_access_path(tree)); 803 804 /* Populate the archive_entry with metadata from the disk. */ 805 /* XXX TODO: Arrange to open a regular file before 806 * calling this so we can pass in an fd and shorten 807 * the race to query metadata. The linkify dance 808 * makes this more complex than it might sound. */ 809#if defined(_WIN32) && !defined(__CYGWIN__) 810 /* TODO: tree.c uses stat(), which is badly broken 811 * on Windows. To fix this, we should 812 * deprecate tree_current_stat() and provide a new 813 * call tree_populate_entry(t, entry). This call 814 * would use stat() internally on POSIX and 815 * GetInfoByFileHandle() internally on Windows. 816 * This would be another step towards a tree-walker 817 * that can be integrated deep into libarchive. 818 * For now, just set st to NULL on Windows; 819 * archive_read_disk_entry_from_file() should 820 * be smart enough to use platform-appropriate 821 * ways to probe file information. 822 */ 823 st = NULL; 824#endif 825 r = archive_read_disk_entry_from_file(bsdtar->diskreader, 826 entry, -1, st); 827 if (r != ARCHIVE_OK) 828 lafe_warnc(archive_errno(bsdtar->diskreader), 829 "%s", archive_error_string(bsdtar->diskreader)); 830 if (r < ARCHIVE_WARN) 831 continue; 832 833 /* XXX TODO: Just use flag data from entry; avoid the 834 * duplicate check here. */ 835 836 /* 837 * If this file/dir is flagged "nodump" and we're 838 * honoring such flags, skip this file/dir. 839 */ 840#if defined(HAVE_STRUCT_STAT_ST_FLAGS) && defined(UF_NODUMP) 841 /* BSD systems store flags in struct stat */ 842 if (bsdtar->option_honor_nodump && 843 (lst->st_flags & UF_NODUMP)) 844 continue; 845#endif 846 847#if defined(EXT2_IOC_GETFLAGS) && defined(EXT2_NODUMP_FL) 848 /* Linux uses ioctl to read flags. */ 849 if (bsdtar->option_honor_nodump) { 850 int fd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY); 851 if (fd >= 0) { 852 unsigned long fflags; 853 int r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags); 854 close(fd); 855 if (r >= 0 && (fflags & EXT2_NODUMP_FL)) 856 continue; 857 } 858 } 859#endif 860 861 /* 862 * If the user vetoes this file/directory, skip it. 863 * We want this to be fairly late; if some other 864 * check would veto this file, we shouldn't bother 865 * the user with it. 866 */ 867 if (bsdtar->option_interactive && 868 !yes("add '%s'", name)) 869 continue; 870 871 /* Note: if user vetoes, we won't descend. */ 872 if (descend && !bsdtar->option_no_subdirs) 873 tree_descend(tree); 874 875 /* 876 * Rewrite the pathname to be archived. If rewrite 877 * fails, skip the entry. 878 */ 879 if (edit_pathname(bsdtar, entry)) 880 continue; 881 882 /* Display entry as we process it. 883 * This format is required by SUSv2. */ 884 if (bsdtar->verbose) 885 safe_fprintf(stderr, "a %s", 886 archive_entry_pathname(entry)); 887 888 /* Non-regular files get archived with zero size. */ 889 if (archive_entry_filetype(entry) != AE_IFREG) 890 archive_entry_set_size(entry, 0); 891 892 archive_entry_linkify(bsdtar->resolver, &entry, &spare_entry); 893 894 while (entry != NULL) { 895 write_entry_backend(bsdtar, a, entry); 896 archive_entry_free(entry); 897 entry = spare_entry; 898 spare_entry = NULL; 899 } 900 901 if (bsdtar->verbose) 902 fprintf(stderr, "\n"); 903 } 904 archive_entry_free(entry); 905 tree_close(tree); 906} 907 908/* 909 * Backend for write_entry. 910 */ 911static void 912write_entry_backend(struct bsdtar *bsdtar, struct archive *a, 913 struct archive_entry *entry) 914{ 915 int fd = -1; 916 int e; 917 918 if (archive_entry_size(entry) > 0) { 919 const char *pathname = archive_entry_sourcepath(entry); 920 fd = open(pathname, O_RDONLY | O_BINARY); 921 if (fd == -1) { 922 if (!bsdtar->verbose) 923 lafe_warnc(errno, 924 "%s: could not open file", pathname); 925 else 926 fprintf(stderr, ": %s", strerror(errno)); 927 return; 928 } 929 } 930 931 e = archive_write_header(a, entry); 932 if (e != ARCHIVE_OK) { 933 if (!bsdtar->verbose) 934 lafe_warnc(0, "%s: %s", 935 archive_entry_pathname(entry), 936 archive_error_string(a)); 937 else 938 fprintf(stderr, ": %s", archive_error_string(a)); 939 } 940 941 if (e == ARCHIVE_FATAL) 942 exit(1); 943 944 /* 945 * If we opened a file earlier, write it out now. Note that 946 * the format handler might have reset the size field to zero 947 * to inform us that the archive body won't get stored. In 948 * that case, just skip the write. 949 */ 950 if (e >= ARCHIVE_WARN && fd >= 0 && archive_entry_size(entry) > 0) { 951 if (write_file_data(bsdtar, a, entry, fd)) 952 exit(1); 953 } 954 955 /* 956 * If we opened a file, close it now even if there was an error 957 * which made us decide not to write the archive body. 958 */ 959 if (fd >= 0) 960 close(fd); 961} 962 963static void 964report_write(struct bsdtar *bsdtar, struct archive *a, 965 struct archive_entry *entry, int64_t progress) 966{ 967 uint64_t comp, uncomp; 968 if (bsdtar->verbose) 969 fprintf(stderr, "\n"); 970 comp = archive_position_compressed(a); 971 uncomp = archive_position_uncompressed(a); 972 fprintf(stderr, "In: %d files, %s bytes;", 973 archive_file_count(a), tar_i64toa(uncomp)); 974 fprintf(stderr, 975 " Out: %s bytes, compression %d%%\n", 976 tar_i64toa(comp), (int)((uncomp - comp) * 100 / uncomp)); 977 /* Can't have two calls to tar_i64toa() pending, so split the output. */ 978 safe_fprintf(stderr, "Current: %s (%s", 979 archive_entry_pathname(entry), 980 tar_i64toa(progress)); 981 fprintf(stderr, "/%s bytes)\n", 982 tar_i64toa(archive_entry_size(entry))); 983} 984 985 986/* Helper function to copy file to archive. */ 987static int 988write_file_data(struct bsdtar *bsdtar, struct archive *a, 989 struct archive_entry *entry, int fd) 990{ 991 ssize_t bytes_read; 992 ssize_t bytes_written; 993 int64_t progress = 0; 994 995 bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN); 996 while (bytes_read > 0) { 997 if (need_report()) 998 report_write(bsdtar, a, entry, progress); 999 1000 bytes_written = archive_write_data(a, bsdtar->buff, 1001 bytes_read); 1002 if (bytes_written < 0) { 1003 /* Write failed; this is bad */ 1004 lafe_warnc(0, "%s", archive_error_string(a)); 1005 return (-1); 1006 } 1007 if (bytes_written < bytes_read) { 1008 /* Write was truncated; warn but continue. */ 1009 lafe_warnc(0, 1010 "%s: Truncated write; file may have grown while being archived.", 1011 archive_entry_pathname(entry)); 1012 return (0); 1013 } 1014 progress += bytes_written; 1015 bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN); 1016 } 1017 return 0; 1018} 1019 1020/* 1021 * Test if the specified file is new enough to include in the archive. 1022 */ 1023static int 1024new_enough(struct bsdtar *bsdtar, const char *path, const struct stat *st) 1025{ 1026 struct archive_dir_entry *p; 1027 1028 /* 1029 * If this file/dir is excluded by a time comparison, skip it. 1030 */ 1031 if (bsdtar->newer_ctime_sec > 0) { 1032 if (st->st_ctime < bsdtar->newer_ctime_sec) 1033 return (0); /* Too old, skip it. */ 1034 if (st->st_ctime == bsdtar->newer_ctime_sec 1035 && ARCHIVE_STAT_CTIME_NANOS(st) 1036 <= bsdtar->newer_ctime_nsec) 1037 return (0); /* Too old, skip it. */ 1038 } 1039 if (bsdtar->newer_mtime_sec > 0) { 1040 if (st->st_mtime < bsdtar->newer_mtime_sec) 1041 return (0); /* Too old, skip it. */ 1042 if (st->st_mtime == bsdtar->newer_mtime_sec 1043 && ARCHIVE_STAT_MTIME_NANOS(st) 1044 <= bsdtar->newer_mtime_nsec) 1045 return (0); /* Too old, skip it. */ 1046 } 1047 1048 /* 1049 * In -u mode, we only write an entry if it's newer than 1050 * what was already in the archive. 1051 */ 1052 if (bsdtar->archive_dir != NULL && 1053 bsdtar->archive_dir->head != NULL) { 1054 for (p = bsdtar->archive_dir->head; p != NULL; p = p->next) { 1055 if (pathcmp(path, p->name)==0) 1056 return (p->mtime_sec < st->st_mtime || 1057 (p->mtime_sec == st->st_mtime && 1058 p->mtime_nsec 1059 < ARCHIVE_STAT_MTIME_NANOS(st))); 1060 } 1061 } 1062 1063 /* If the file wasn't rejected, include it. */ 1064 return (1); 1065} 1066 1067/* 1068 * Add an entry to the dir list for 'u' mode. 1069 * 1070 * XXX TODO: Make this fast. 1071 */ 1072static void 1073add_dir_list(struct bsdtar *bsdtar, const char *path, 1074 time_t mtime_sec, int mtime_nsec) 1075{ 1076 struct archive_dir_entry *p; 1077 1078 /* 1079 * Search entire list to see if this file has appeared before. 1080 * If it has, override the timestamp data. 1081 */ 1082 p = bsdtar->archive_dir->head; 1083 while (p != NULL) { 1084 if (strcmp(path, p->name)==0) { 1085 p->mtime_sec = mtime_sec; 1086 p->mtime_nsec = mtime_nsec; 1087 return; 1088 } 1089 p = p->next; 1090 } 1091 1092 p = malloc(sizeof(*p)); 1093 if (p == NULL) 1094 lafe_errc(1, ENOMEM, "Can't read archive directory"); 1095 1096 p->name = strdup(path); 1097 if (p->name == NULL) 1098 lafe_errc(1, ENOMEM, "Can't read archive directory"); 1099 p->mtime_sec = mtime_sec; 1100 p->mtime_nsec = mtime_nsec; 1101 p->next = NULL; 1102 if (bsdtar->archive_dir->tail == NULL) { 1103 bsdtar->archive_dir->head = bsdtar->archive_dir->tail = p; 1104 } else { 1105 bsdtar->archive_dir->tail->next = p; 1106 bsdtar->archive_dir->tail = p; 1107 } 1108} 1109 1110static void 1111test_for_append(struct bsdtar *bsdtar) 1112{ 1113 struct stat s; 1114 1115 if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL) 1116 lafe_errc(1, 0, "no files or directories specified"); 1117 if (bsdtar->filename == NULL) 1118 lafe_errc(1, 0, "Cannot append to stdout."); 1119 1120 if (bsdtar->create_compression != 0) 1121 lafe_errc(1, 0, 1122 "Cannot append to %s with compression", bsdtar->filename); 1123 1124 if (stat(bsdtar->filename, &s) != 0) 1125 return; 1126 1127 if (!S_ISREG(s.st_mode) && !S_ISBLK(s.st_mode)) 1128 lafe_errc(1, 0, 1129 "Cannot append to %s: not a regular file.", 1130 bsdtar->filename); 1131 1132/* Is this an appropriate check here on Windows? */ 1133/* 1134 if (GetFileType(handle) != FILE_TYPE_DISK) 1135 lafe_errc(1, 0, "Cannot append"); 1136*/ 1137 1138} 1139