wimlib.net Git - wimlib/blob - src/modify.c

   1 /*
   2  * modify.c
   3  *
   4  * Support for modifying WIM files with image-level operations (delete an image,
   5  * add an image, export an imagex from one WIM to another.)  There is nothing
   6  * here that lets you change individual files in the WIM; for that you will need
   7  * to look at the filesystem implementation in mount.c.
   8  */
   9
  10 /*
  11  * Copyright (C) 2012 Eric Biggers
  12  *
  13  * This file is part of wimlib, a library for working with WIM files.
  14  *
  15  * wimlib is free software; you can redistribute it and/or modify it under the
  16  * terms of the GNU Lesser General Public License as published by the Free
  17  * Software Foundation; either version 2.1 of the License, or (at your option)
  18  * any later version.
  19  *
  20  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  21  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  22  * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  23  * details.
  24  *
  25  * You should have received a copy of the GNU Lesser General Public License
  26  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  27  */
  28
  29 #include "wimlib_internal.h"
  30 #include "util.h"
  31 #include "sha1.h"
  32 #include "dentry.h"
  33 #include "xml.h"
  34 #include "lookup_table.h"
  35 #include <sys/stat.h>
  36 #include <dirent.h>
  37 #include <string.h>
  38 #include <errno.h>
  39 #include <fnmatch.h>
  40 #include <ctype.h>
  41 #include <unistd.h>
  42
  43 /** Private flag: Used to mark that we currently adding the root directory of
  44  * the WIM. */
  45 #define WIMLIB_ADD_IMAGE_FLAG_ROOT 0x80000000
  46
  47 void destroy_image_metadata(struct image_metadata *imd,struct lookup_table *lt)
  48 {
  49         free_dentry_tree(imd->root_dentry, lt);
  50         free_security_data(imd->security_data);
  51         free_link_group_table(imd->lgt);
  52
  53         /* Get rid of the lookup table entry for this image's metadata resource
  54          * */
  55         if (lt)
  56                 lookup_table_remove(lt, imd->metadata_lte);
  57 }
  58
  59 /*
  60  * Recursively builds a dentry tree from a directory tree on disk, outside the
  61  * WIM file.
  62  *
  63  * @root:  A dentry that has already been created for the root of the dentry
  64  *         tree.
  65  * @root_disk_path:  The path to the root of the tree on disk.
  66  * @lookup_table: The lookup table for the WIM file.  For each file added to the
  67  *              dentry tree being built, an entry is added to the lookup table,
  68  *              unless an identical file is already in the lookup table.  These
  69  *              lookup table entries that are added point to the file on disk.
  70  *
  71  * @return:     0 on success, nonzero on failure.  It is a failure if any of
  72  *              the files cannot be `stat'ed, or if any of the needed
  73  *              directories cannot be opened or read.  Failure to add the files
  74  *              to the WIM may still occur later when trying to actually read
  75  *              the regular files in the tree into the WIM as file resources.
  76  */
  77 static int build_dentry_tree(struct dentry **root_ret, const char *root_disk_path,
  78                              struct lookup_table *lookup_table,
  79                              struct wim_security_data *sd,
  80                              const struct capture_config *config,
  81                              int add_flags,
  82                              void *extra_arg)
  83 {
  84         struct stat root_stbuf;
  85         int ret = 0;
  86         int (*stat_fn)(const char *restrict, struct stat *restrict);
  87         struct dentry *root;
  88
  89         if (exclude_path(root_disk_path, config, true)) {
  90                 if (add_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
  91                         printf("Excluding file `%s' from capture\n",
  92                                root_disk_path);
  93                 *root_ret = NULL;
  94                 return 0;
  95         }
  96
  97
  98         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)
  99                 stat_fn = stat;
 100         else
 101                 stat_fn = lstat;
 102
 103         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 104                 printf("Scanning `%s'\n", root_disk_path);
 105
 106
 107         ret = (*stat_fn)(root_disk_path, &root_stbuf);
 108         if (ret != 0) {
 109                 ERROR_WITH_ERRNO("Failed to stat `%s'", root_disk_path);
 110                 return WIMLIB_ERR_STAT;
 111         }
 112
 113         if ((add_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) &&
 114               !S_ISDIR(root_stbuf.st_mode)) {
 115                 ERROR("`%s' is not a directory", root_disk_path);
 116                 return WIMLIB_ERR_NOTDIR;
 117         }
 118         if (!S_ISREG(root_stbuf.st_mode) && !S_ISDIR(root_stbuf.st_mode)
 119             && !S_ISLNK(root_stbuf.st_mode)) {
 120                 ERROR("`%s' is not a regular file, directory, or symbolic link.");
 121                 return WIMLIB_ERR_SPECIAL_FILE;
 122         }
 123
 124         root = new_dentry(path_basename(root_disk_path));
 125         if (!root)
 126                 return WIMLIB_ERR_NOMEM;
 127
 128         stbuf_to_dentry(&root_stbuf, root);
 129         add_flags &= ~WIMLIB_ADD_IMAGE_FLAG_ROOT;
 130         root->resolved = true;
 131
 132         if (dentry_is_directory(root)) {
 133                 /* Open the directory on disk */
 134                 DIR *dir;
 135                 struct dirent *p;
 136                 struct dentry *child;
 137
 138                 dir = opendir(root_disk_path);
 139                 if (!dir) {
 140                         ERROR_WITH_ERRNO("Failed to open the directory `%s'",
 141                                          root_disk_path);
 142                         return WIMLIB_ERR_OPEN;
 143                 }
 144
 145                 /* Buffer for names of files in directory. */
 146                 size_t len = strlen(root_disk_path);
 147                 char name[len + 1 + FILENAME_MAX + 1];
 148                 memcpy(name, root_disk_path, len);
 149                 name[len] = '/';
 150
 151                 /* Create a dentry for each entry in the directory on disk, and recurse
 152                  * to any subdirectories. */
 153                 while ((p = readdir(dir)) != NULL) {
 154                         if (p->d_name[0] == '.' && (p->d_name[1] == '\0'
 155                               || (p->d_name[1] == '.' && p->d_name[2] == '\0')))
 156                                         continue;
 157                         strcpy(name + len + 1, p->d_name);
 158                         ret = build_dentry_tree(&child, name, lookup_table,
 159                                                 sd, config,
 160                                                 add_flags, extra_arg);
 161                         if (ret != 0)
 162                                 break;
 163                         if (child)
 164                                 link_dentry(child, root);
 165                 }
 166                 closedir(dir);
 167         } else if (dentry_is_symlink(root)) {
 168                 /* Archiving a symbolic link */
 169                 size_t symlink_buf_len;
 170                 char deref_name_buf[4096];
 171                 ssize_t deref_name_len;
 172
 173                 deref_name_len = readlink(root_disk_path, deref_name_buf,
 174                                           sizeof(deref_name_buf) - 1);
 175                 if (deref_name_len == -1) {
 176                         ERROR_WITH_ERRNO("Failed to read target of "
 177                                          "symbolic link `%s'", root_disk_path);
 178                         return WIMLIB_ERR_READLINK;
 179                 }
 180                 deref_name_buf[deref_name_len] = '\0';
 181                 DEBUG("Read symlink `%s'", deref_name_buf);
 182                 ret = dentry_set_symlink(root, deref_name_buf,
 183                                          lookup_table, NULL);
 184         } else {
 185                 /* Regular file */
 186                 struct lookup_table_entry *lte;
 187                 u8 hash[SHA1_HASH_SIZE];
 188
 189                 /* Empty files do not have to have a lookup table entry. */
 190                 if (root_stbuf.st_size == 0)
 191                         goto out;
 192
 193                 /* For each regular file, we must check to see if the file is in
 194                  * the lookup table already; if it is, we increment its refcnt;
 195                  * otherwise, we create a new lookup table entry and insert it.
 196                  * */
 197                 ret = sha1sum(root_disk_path, hash);
 198                 if (ret != 0)
 199                         return ret;
 200
 201                 lte = __lookup_resource(lookup_table, hash);
 202                 if (lte) {
 203                         lte->refcnt++;
 204                         DEBUG("Add lte reference %u for `%s'", lte->refcnt,
 205                               root_disk_path);
 206                 } else {
 207                         char *file_on_disk = STRDUP(root_disk_path);
 208                         if (!file_on_disk) {
 209                                 ERROR("Failed to allocate memory for file path");
 210                                 return WIMLIB_ERR_NOMEM;
 211                         }
 212                         lte = new_lookup_table_entry();
 213                         if (!lte) {
 214                                 FREE(file_on_disk);
 215                                 return WIMLIB_ERR_NOMEM;
 216                         }
 217                         lte->file_on_disk = file_on_disk;
 218                         lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 219                         lte->resource_entry.original_size = root_stbuf.st_size;
 220                         lte->resource_entry.size = root_stbuf.st_size;
 221                         copy_hash(lte->hash, hash);
 222                         lookup_table_insert(lookup_table, lte);
 223                 }
 224                 root->lte = lte;
 225         }
 226 out:
 227         *root_ret = root;
 228         return ret;
 229 }
 230
 231 struct wim_pair {
 232         WIMStruct *src_wim;
 233         WIMStruct *dest_wim;
 234 };
 235
 236 /*
 237  * This function takes in a dentry that was previously located only in image(s)
 238  * in @src_wim, but now is being added to @dest_wim. If there is in fact already a
 239  * lookup table entry for this file in the lookup table of the destination WIM
 240  * file, we simply increment its reference count.  Otherwise, a new lookup table
 241  * entry is created that references the location of the file resource in the
 242  * source WIM file through the other_wim_fp field of the lookup table entry.
 243  */
 244 static int add_lte_to_dest_wim(struct dentry *dentry, void *arg)
 245 {
 246         WIMStruct *src_wim, *dest_wim;
 247
 248         src_wim = ((struct wim_pair*)arg)->src_wim;
 249         dest_wim = ((struct wim_pair*)arg)->dest_wim;
 250
 251         wimlib_assert(!dentry->resolved);
 252
 253         for (unsigned i = 0; i < (unsigned)dentry->num_ads + 1; i++) {
 254                 struct lookup_table_entry *src_lte, *dest_lte;
 255                 src_lte = dentry_stream_lte_unresolved(dentry, i,
 256                                                        src_wim->lookup_table);
 257                 if (!src_lte)
 258                         continue;
 259                 dest_lte = dentry_stream_lte_unresolved(dentry, i,
 260                                                         dest_wim->lookup_table);
 261                 if (dest_lte) {
 262                         dest_lte->refcnt++;
 263                 } else {
 264                         dest_lte = new_lookup_table_entry();
 265                         if (!dest_lte)
 266                                 return WIMLIB_ERR_NOMEM;
 267                         dest_lte->resource_location = RESOURCE_IN_WIM;
 268                         dest_lte->wim = src_wim;
 269                         memcpy(&dest_lte->resource_entry,
 270                                &src_lte->resource_entry,
 271                                sizeof(struct resource_entry));
 272                         copy_hash(dest_lte->hash,
 273                                   dentry_stream_hash_unresolved(dentry, i));
 274                         lookup_table_insert(dest_wim->lookup_table, dest_lte);
 275                 }
 276         }
 277         return 0;
 278 }
 279
 280 /*
 281  * Adds an image (given by its dentry tree) to the image metadata array of a WIM
 282  * file, adds an entry to the lookup table for the image metadata, updates the
 283  * image count in the header, and selects the new image.
 284  *
 285  * Does not update the XML data.
 286  *
 287  * @w:            The WIMStruct for the WIM file.
 288  * @root_dentry:  The root of the directory tree for the image.
 289  */
 290 static int add_new_dentry_tree(WIMStruct *w, struct dentry *root_dentry,
 291                                struct wim_security_data *sd)
 292 {
 293         struct lookup_table_entry *metadata_lte;
 294         struct image_metadata *imd;
 295         struct image_metadata *new_imd;
 296         struct link_group_table *lgt;
 297
 298         DEBUG("Reallocating image metadata array for image_count = %u",
 299               w->hdr.image_count + 1);
 300         imd = CALLOC((w->hdr.image_count + 1), sizeof(struct image_metadata));
 301
 302         if (!imd) {
 303                 ERROR("Failed to allocate memory for new image metadata array");
 304                 return WIMLIB_ERR_NOMEM;
 305         }
 306
 307         memcpy(imd, w->image_metadata,
 308                w->hdr.image_count * sizeof(struct image_metadata));
 309
 310         metadata_lte = new_lookup_table_entry();
 311         if (!metadata_lte)
 312                 goto out_free_imd;
 313
 314         lgt = new_link_group_table(9001);
 315         if (!lgt)
 316                 goto out_free_security_data;
 317
 318         metadata_lte->resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
 319         random_hash(metadata_lte->hash);
 320         lookup_table_insert(w->lookup_table, metadata_lte);
 321
 322         new_imd = &imd[w->hdr.image_count];
 323
 324         new_imd->root_dentry    = root_dentry;
 325         new_imd->metadata_lte   = metadata_lte;
 326         new_imd->security_data  = sd;
 327         new_imd->lgt            = lgt;
 328         new_imd->modified       = true;
 329
 330         FREE(w->image_metadata);
 331         w->image_metadata       = imd;
 332         w->hdr.image_count++;
 333
 334         /* Change the current image to the new one. */
 335         return wimlib_select_image(w, w->hdr.image_count);
 336 out_free_security_data:
 337         FREE(sd);
 338 out_free_metadata_lte:
 339         FREE(metadata_lte);
 340 out_free_imd:
 341         FREE(imd);
 342         return WIMLIB_ERR_NOMEM;
 343
 344 }
 345
 346 /*
 347  * Copies an image, or all the images, from a WIM file, into another WIM file.
 348  */
 349 WIMLIBAPI int wimlib_export_image(WIMStruct *src_wim,
 350                                   int src_image,
 351                                   WIMStruct *dest_wim,
 352                                   const char *dest_name,
 353                                   const char *dest_description,
 354                                   int flags)
 355 {
 356         int i;
 357         int ret;
 358         struct dentry *root;
 359         struct wim_pair wims;
 360         struct wim_security_data *sd;
 361
 362         if (src_image == WIM_ALL_IMAGES) {
 363                 if (src_wim->hdr.image_count > 1) {
 364
 365                         /* multi-image export. */
 366
 367                         if ((flags & WIMLIB_EXPORT_FLAG_BOOT) &&
 368                               (src_wim->hdr.boot_idx == 0))
 369                         {
 370                                 /* Specifying the boot flag on a multi-image
 371                                  * source WIM makes the boot index default to
 372                                  * the bootable image in the source WIM.  It is
 373                                  * an error if there is no such bootable image.
 374                                  * */
 375                                 ERROR("Cannot specify `boot' flag when "
 376                                       "exporting multiple images from a WIM "
 377                                       "with no bootable images");
 378                                 return WIMLIB_ERR_INVALID_PARAM;
 379                         }
 380                         if (dest_name || dest_description) {
 381                                 ERROR("Image name or image description was "
 382                                       "specified, but we are exporting "
 383                                       "multiple images");
 384                                 return WIMLIB_ERR_INVALID_PARAM;
 385                         }
 386                         for (i = 1; i <= src_wim->hdr.image_count; i++) {
 387                                 int export_flags = flags;
 388
 389                                 if (i != src_wim->hdr.boot_idx)
 390                                         export_flags &= ~WIMLIB_EXPORT_FLAG_BOOT;
 391
 392                                 ret = wimlib_export_image(src_wim, i, dest_wim,
 393                                                           NULL,
 394                                                           dest_description,
 395                                                           export_flags);
 396                                 if (ret != 0)
 397                                         return ret;
 398                         }
 399                         return 0;
 400                 } else {
 401                         src_image = 1;
 402                 }
 403         }
 404
 405         ret = wimlib_select_image(src_wim, src_image);
 406         if (ret != 0) {
 407                 ERROR("Could not select image %d from the WIM `%s' "
 408                       "to export it", src_image, src_wim->filename);
 409                 return ret;
 410         }
 411
 412         if (!dest_name) {
 413                 dest_name = wimlib_get_image_name(src_wim, src_image);
 414                 DEBUG("Using name `%s' for source image %d",
 415                       dest_name, src_image);
 416         }
 417
 418         DEBUG("Exporting image %d from `%s'", src_image, src_wim->filename);
 419
 420         if (wimlib_image_name_in_use(dest_wim, dest_name)) {
 421                 ERROR("There is already an image named `%s' in the "
 422                       "destination WIM", dest_name);
 423                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 424         }
 425
 426
 427         /* Cleaning up here on failure would be hard.  For example, we could
 428          * fail to allocate memory in add_lte_to_dest_wim(),
 429          * leaving the lookup table entries in the destination WIM in an
 430          * inconsistent state.  Until these issues can be resolved,
 431          * wimlib_export_image() is documented as leaving dest_wim is an
 432          * indeterminate state.  */
 433         root = wim_root_dentry(src_wim);
 434         sd = wim_security_data(src_wim);
 435         for_dentry_in_tree(root, increment_dentry_refcnt, NULL);
 436         wims.src_wim = src_wim;
 437         wims.dest_wim = dest_wim;
 438         ret = for_dentry_in_tree(root, add_lte_to_dest_wim, &wims);
 439         if (ret != 0)
 440                 return ret;
 441         ret = add_new_dentry_tree(dest_wim, root, sd);
 442         if (ret != 0)
 443                 return ret;
 444         sd->refcnt++;
 445
 446         if (flags & WIMLIB_EXPORT_FLAG_BOOT) {
 447                 DEBUG("Setting boot_idx to %d", dest_wim->hdr.image_count);
 448                 dest_wim->hdr.boot_idx = dest_wim->hdr.image_count;
 449         }
 450
 451         return xml_export_image(src_wim->wim_info, src_image, &dest_wim->wim_info,
 452                                 dest_name, dest_description);
 453 }
 454
 455 /*
 456  * Deletes an image from the WIM.
 457  */
 458 WIMLIBAPI int wimlib_delete_image(WIMStruct *w, int image)
 459 {
 460         int num_images;
 461         int i;
 462         int ret;
 463
 464         if (image == WIM_ALL_IMAGES) {
 465                 num_images = w->hdr.image_count;
 466                 for (i = 1; i <= num_images; i++) {
 467                         /* Always delete the first image, since by the end
 468                          * there won't be any more than that!  */
 469                         ret = wimlib_delete_image(w, 1);
 470                         if (ret != 0)
 471                                 return ret;
 472                 }
 473                 return 0;
 474         }
 475
 476         DEBUG("Deleting image %d", image);
 477
 478         /* Even if the dentry tree is not allocated, we must select it (and
 479          * therefore allocate it) so that we can decrement the reference counts
 480          * in the lookup table.  */
 481         ret = wimlib_select_image(w, image);
 482         if (ret != 0)
 483                 return ret;
 484
 485         /* Free the dentry tree, any lookup table entries that have their
 486          * refcnt decremented to 0, and the security data. */
 487         destroy_image_metadata(wim_get_current_image_metadata(w),
 488                                w->lookup_table);
 489
 490         /* Get rid of the empty slot in the image metadata array. */
 491         memmove(&w->image_metadata[image - 1], &w->image_metadata[image],
 492                 (w->hdr.image_count - image) * sizeof(struct image_metadata));
 493
 494         /* Decrement the image count. */
 495         if (--w->hdr.image_count == 0) {
 496                 FREE(w->image_metadata);
 497                 w->image_metadata = NULL;
 498         }
 499
 500         /* Fix the boot index. */
 501         if (w->hdr.boot_idx == image)
 502                 w->hdr.boot_idx = 0;
 503         else if (w->hdr.boot_idx > image)
 504                 w->hdr.boot_idx--;
 505
 506         w->current_image = WIM_NO_IMAGE;
 507
 508         /* Remove the image from the XML information. */
 509         xml_delete_image(&w->wim_info, image);
 510         return 0;
 511 }
 512
 513 enum pattern_type {
 514         NONE = 0,
 515         EXCLUSION_LIST,
 516         EXCLUSION_EXCEPTION,
 517         COMPRESSION_EXCLUSION_LIST,
 518         ALIGNMENT_LIST,
 519 };
 520
 521 static const char *default_config =
 522 "[ExclusionList]\n"
 523 "\\$ntfs.log\n"
 524 "\\hiberfil.sys\n"
 525 "\\pagefile.sys\n"
 526 "\\System Volume Information\n"
 527 "\\RECYCLER\n"
 528 "\\Windows\\CSC\n"
 529 "\n"
 530 "[CompressionExclusionList]\n"
 531 "*.mp3\n"
 532 "*.zip\n"
 533 "*.cab\n"
 534 "\\WINDOWS\\inf\\*.pnf\n";
 535
 536 static void destroy_pattern_list(struct pattern_list *list)
 537 {
 538         FREE(list->pats);
 539 }
 540
 541 static void destroy_capture_config(struct capture_config *config)
 542 {
 543         destroy_pattern_list(&config->exclusion_list);
 544         destroy_pattern_list(&config->exclusion_exception);
 545         destroy_pattern_list(&config->compression_exclusion_list);
 546         destroy_pattern_list(&config->alignment_list);
 547         FREE(config->config_str);
 548         FREE(config->prefix);
 549         memset(config, 0, sizeof(*config));
 550 }
 551
 552 static int pattern_list_add_pattern(struct pattern_list *list,
 553                                     const char *pattern)
 554 {
 555         const char **pats;
 556         if (list->num_pats >= list->num_allocated_pats) {
 557                 pats = REALLOC(list->pats,
 558                                sizeof(list->pats[0]) * (list->num_allocated_pats + 8));
 559                 if (!pats)
 560                         return WIMLIB_ERR_NOMEM;
 561                 list->num_allocated_pats += 8;
 562                 list->pats = pats;
 563         }
 564         list->pats[list->num_pats++] = pattern;
 565         return 0;
 566 }
 567
 568 static int init_capture_config(const char *_config_str, size_t config_len,
 569                                const char *_prefix, struct capture_config *config)
 570 {
 571         char *config_str;
 572         char *prefix;
 573         char *p;
 574         char *eol;
 575         char *next_p;
 576         size_t next_bytes_remaining;
 577         size_t bytes_remaining;
 578         enum pattern_type type = NONE;
 579         int ret;
 580         unsigned long line_no = 0;
 581
 582         DEBUG("config_len = %zu", config_len);
 583         bytes_remaining = config_len;
 584         memset(config, 0, sizeof(*config));
 585         config_str = MALLOC(config_len);
 586         if (!config_str) {
 587                 ERROR("Could not duplicate capture config string");
 588                 return WIMLIB_ERR_NOMEM;
 589         }
 590         prefix = STRDUP(_prefix);
 591         if (!prefix) {
 592                 FREE(config_str);
 593                 return WIMLIB_ERR_NOMEM;
 594         }
 595
 596         memcpy(config_str, _config_str, config_len);
 597         next_p = config_str;
 598         config->config_str = config_str;
 599         config->prefix = prefix;
 600         config->prefix_len = strlen(prefix);
 601         while (bytes_remaining) {
 602                 line_no++;
 603                 p = next_p;
 604                 eol = memchr(p, '\n', bytes_remaining);
 605                 if (!eol) {
 606                         ERROR("Expected end-of-line in capture config file on "
 607                               "line %lu", line_no);
 608                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 609                         goto out_destroy;
 610                 }
 611
 612                 next_p = eol + 1;
 613                 bytes_remaining -= (eol - p) + 1;
 614                 if (eol == p)
 615                         continue;
 616
 617                 if (*(eol - 1) == '\r')
 618                         eol--;
 619                 *eol = '\0';
 620
 621                 /* Translate backslash to forward slash */
 622                 for (char *pp = p; pp != eol; pp++)
 623                         if (*pp == '\\')
 624                                 *pp = '/';
 625
 626                 /* Remove drive letter */
 627                 if (eol - p > 2 && isalpha(*p) && *(p + 1) == ':')
 628                         p += 2;
 629
 630                 if (strcmp(p, "[ExclusionList]") == 0)
 631                         type = EXCLUSION_LIST;
 632                 else if (strcmp(p, "[ExclusionException]") == 0)
 633                         type = EXCLUSION_EXCEPTION;
 634                 else if (strcmp(p, "[CompressionExclusionList]") == 0)
 635                         type = COMPRESSION_EXCLUSION_LIST;
 636                 else if (strcmp(p, "[AlignmentList]") == 0)
 637                         type = ALIGNMENT_LIST;
 638                 else switch (type) {
 639                 case EXCLUSION_LIST:
 640                         DEBUG("Adding pattern \"%s\" to exclusion list", p);
 641                         ret = pattern_list_add_pattern(&config->exclusion_list, p);
 642                         break;
 643                 case EXCLUSION_EXCEPTION:
 644                         DEBUG("Adding pattern \"%s\" to exclusion exception list", p);
 645                         ret = pattern_list_add_pattern(&config->exclusion_exception, p);
 646                         break;
 647                 case COMPRESSION_EXCLUSION_LIST:
 648                         DEBUG("Adding pattern \"%s\" to compression exclusion list", p);
 649                         ret = pattern_list_add_pattern(&config->compression_exclusion_list, p);
 650                         break;
 651                 case ALIGNMENT_LIST:
 652                         DEBUG("Adding pattern \"%s\" to alignment list", p);
 653                         ret = pattern_list_add_pattern(&config->alignment_list, p);
 654                         break;
 655                 default:
 656                         ERROR("Line %lu of capture configuration is not "
 657                               "in a block (such as [ExclusionList])",
 658                               line_no);
 659                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 660                         goto out_destroy;
 661                 }
 662                 if (ret != 0)
 663                         goto out_destroy;
 664         }
 665         return 0;
 666 out_destroy:
 667         destroy_capture_config(config);
 668         return ret;
 669 }
 670
 671 static bool match_pattern(const char *path, const char *path_basename,
 672                           const struct pattern_list *list)
 673 {
 674         for (size_t i = 0; i < list->num_pats; i++) {
 675                 const char *pat = list->pats[i];
 676                 const char *string;
 677                 if (pat[0] == '/')
 678                         /* Absolute path from root of capture */
 679                         string = path;
 680                 else {
 681                         if (strchr(pat, '/'))
 682                                 /* Relative path from root of capture */
 683                                 string = path + 1;
 684                         else
 685                                 /* A file name pattern */
 686                                 string = path_basename;
 687                 }
 688                 if (fnmatch(pat, string, FNM_PATHNAME
 689                         #ifdef FNM_CASEFOLD
 690                                         | FNM_CASEFOLD
 691                         #endif
 692                         ) == 0)
 693                 {
 694                         DEBUG("`%s' matches the pattern \"%s\"",
 695                               string, pat);
 696                         return true;
 697                 }
 698         }
 699         return false;
 700 }
 701
 702 static void print_pattern_list(const struct pattern_list *list)
 703 {
 704         for (size_t i = 0; i < list->num_pats; i++)
 705                 printf("    %s\n", list->pats[i]);
 706 }
 707
 708 static void print_capture_config(const struct capture_config *config)
 709 {
 710         if (config->exclusion_list.num_pats) {
 711                 puts("Files or folders excluded from image capture:");
 712                 print_pattern_list(&config->exclusion_list);
 713                 putchar('\n');
 714         }
 715 }
 716
 717 bool exclude_path(const char *path, const struct capture_config *config,
 718                   bool exclude_prefix)
 719 {
 720         const char *basename = path_basename(path);
 721         if (exclude_prefix) {
 722                 wimlib_assert(strlen(path) >= config->prefix_len);
 723                 if (memcmp(config->prefix, path, config->prefix_len) == 0
 724                      && path[config->prefix_len] == '/')
 725                         path += config->prefix_len;
 726         }
 727         return match_pattern(path, basename, &config->exclusion_list) &&
 728                 !match_pattern(path, basename, &config->exclusion_exception);
 729
 730 }
 731
 732
 733
 734 int do_add_image(WIMStruct *w, const char *dir, const char *name,
 735                  const char *config_str, size_t config_len,
 736                  int flags,
 737                  int (*capture_tree)(struct dentry **, const char *,
 738                                      struct lookup_table *,
 739                                      struct wim_security_data *,
 740                                      const struct capture_config *,
 741                                      int, void *),
 742                  void *extra_arg)
 743 {
 744         struct dentry *root_dentry = NULL;
 745         struct image_metadata *imd;
 746         struct wim_security_data *sd;
 747         struct capture_config config;
 748         int ret;
 749
 750         DEBUG("Adding dentry tree from dir `%s'.", dir);
 751
 752         if (!name || !*name) {
 753                 ERROR("Must specify a non-empty string for the image name");
 754                 return WIMLIB_ERR_INVALID_PARAM;
 755         }
 756         if (!dir) {
 757                 ERROR("Must specify the name of a directory");
 758                 return WIMLIB_ERR_INVALID_PARAM;
 759         }
 760
 761         if (wimlib_image_name_in_use(w, name)) {
 762                 ERROR("There is already an image named \"%s\" in `%s'",
 763                       name, w->filename);
 764                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 765         }
 766
 767         DEBUG("Initializing capture configuration");
 768         if (!config_str) {
 769                 DEBUG("Using default capture configuration");
 770                 config_str = default_config;
 771                 config_len = strlen(default_config);
 772         }
 773         ret = init_capture_config(config_str, config_len, dir, &config);
 774         if (ret != 0)
 775                 return ret;
 776         print_capture_config(&config);
 777
 778         DEBUG("Allocating security data");
 779
 780         sd = CALLOC(1, sizeof(struct wim_security_data));
 781         if (!sd)
 782                 goto out_destroy_config;
 783         sd->total_length = 8;
 784         sd->refcnt = 1;
 785
 786         DEBUG("Building dentry tree.");
 787         ret = (*capture_tree)(&root_dentry, dir, w->lookup_table, sd,
 788                               &config, flags | WIMLIB_ADD_IMAGE_FLAG_ROOT,
 789                               extra_arg);
 790         destroy_capture_config(&config);
 791
 792         if (ret != 0) {
 793                 ERROR("Failed to build dentry tree for `%s'", dir);
 794                 goto out_free_dentry_tree;
 795         }
 796
 797         DEBUG("Calculating full paths of dentries.");
 798         ret = for_dentry_in_tree(root_dentry, calculate_dentry_full_path, NULL);
 799         if (ret != 0)
 800                 goto out_free_dentry_tree;
 801
 802         ret = add_new_dentry_tree(w, root_dentry, sd);
 803         if (ret != 0)
 804                 goto out_free_dentry_tree;
 805
 806         DEBUG("Inserting dentries into hard link group table");
 807         ret = for_dentry_in_tree(root_dentry, link_group_table_insert,
 808                                  w->image_metadata[w->hdr.image_count - 1].lgt);
 809         if (ret != 0)
 810                 goto out_destroy_imd;
 811         DEBUG("Assigning hard link groups");
 812         assign_link_groups(w->image_metadata[w->hdr.image_count - 1].lgt);
 813
 814         if (flags & WIMLIB_ADD_IMAGE_FLAG_BOOT)
 815                 wimlib_set_boot_idx(w, w->hdr.image_count);
 816
 817         ret = xml_add_image(w, root_dentry, name);
 818         if (ret != 0)
 819                 goto out_destroy_imd;
 820
 821         return 0;
 822 out_destroy_imd:
 823         destroy_image_metadata(&w->image_metadata[w->hdr.image_count - 1],
 824                                w->lookup_table);
 825         w->hdr.image_count--;
 826         return ret;
 827 out_free_dentry_tree:
 828         free_dentry_tree(root_dentry, w->lookup_table);
 829 out_free_sd:
 830         free_security_data(sd);
 831 out_destroy_config:
 832         destroy_capture_config(&config);
 833         return ret;
 834 }
 835
 836 /*
 837  * Adds an image to a WIM file from a directory tree on disk.
 838  */
 839 WIMLIBAPI int wimlib_add_image(WIMStruct *w, const char *dir,
 840                                const char *name, const char *config_str,
 841                                size_t config_len, int flags)
 842 {
 843         return do_add_image(w, dir, name, config_str, config_len, flags,
 844                             build_dentry_tree, NULL);
 845 }