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   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                 /* For each regular file, we must check to see if the file is in
 190                  * the lookup table already; if it is, we increment its refcnt;
 191                  * otherwise, we create a new lookup table entry and insert it.
 192                  * */
 193                 ret = sha1sum(root_disk_path, hash);
 194                 if (ret != 0)
 195                         return ret;
 196
 197                 lte = __lookup_resource(lookup_table, hash);
 198                 if (lte) {
 199                         lte->refcnt++;
 200                         DEBUG("Add lte reference %u for `%s'", lte->refcnt,
 201                               root_disk_path);
 202                 } else {
 203                         char *file_on_disk = STRDUP(root_disk_path);
 204                         if (!file_on_disk) {
 205                                 ERROR("Failed to allocate memory for file path");
 206                                 return WIMLIB_ERR_NOMEM;
 207                         }
 208                         lte = new_lookup_table_entry();
 209                         if (!lte) {
 210                                 FREE(file_on_disk);
 211                                 return WIMLIB_ERR_NOMEM;
 212                         }
 213                         lte->file_on_disk = file_on_disk;
 214                         lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 215                         lte->resource_entry.original_size = root_stbuf.st_size;
 216                         lte->resource_entry.size = root_stbuf.st_size;
 217                         copy_hash(lte->hash, hash);
 218                         lookup_table_insert(lookup_table, lte);
 219                 }
 220                 root->lte = lte;
 221         }
 222         *root_ret = root;
 223         return ret;
 224 }
 225
 226 struct wim_pair {
 227         WIMStruct *src_wim;
 228         WIMStruct *dest_wim;
 229 };
 230
 231 /*
 232  * This function takes in a dentry that was previously located only in image(s)
 233  * in @src_wim, but now is being added to @dest_wim. If there is in fact already a
 234  * lookup table entry for this file in the lookup table of the destination WIM
 235  * file, we simply increment its reference count.  Otherwise, a new lookup table
 236  * entry is created that references the location of the file resource in the
 237  * source WIM file through the other_wim_fp field of the lookup table entry.
 238  */
 239 static int add_lte_to_dest_wim(struct dentry *dentry, void *arg)
 240 {
 241         WIMStruct *src_wim, *dest_wim;
 242
 243         src_wim = ((struct wim_pair*)arg)->src_wim;
 244         dest_wim = ((struct wim_pair*)arg)->dest_wim;
 245
 246         wimlib_assert(!dentry->resolved);
 247
 248         for (unsigned i = 0; i < (unsigned)dentry->num_ads + 1; i++) {
 249                 struct lookup_table_entry *src_lte, *dest_lte;
 250                 src_lte = dentry_stream_lte_unresolved(dentry, i,
 251                                                        src_wim->lookup_table);
 252                 if (!src_lte)
 253                         continue;
 254                 dest_lte = dentry_stream_lte_unresolved(dentry, i,
 255                                                         dest_wim->lookup_table);
 256                 if (dest_lte) {
 257                         dest_lte->refcnt++;
 258                 } else {
 259                         dest_lte = new_lookup_table_entry();
 260                         if (!dest_lte)
 261                                 return WIMLIB_ERR_NOMEM;
 262                         dest_lte->resource_location = RESOURCE_IN_WIM;
 263                         dest_lte->wim = src_wim;
 264                         memcpy(&dest_lte->resource_entry,
 265                                &src_lte->resource_entry,
 266                                sizeof(struct resource_entry));
 267                         copy_hash(dest_lte->hash,
 268                                   dentry_stream_hash_unresolved(dentry, i));
 269                         lookup_table_insert(dest_wim->lookup_table, dest_lte);
 270                 }
 271         }
 272         return 0;
 273 }
 274
 275 /*
 276  * Adds an image (given by its dentry tree) to the image metadata array of a WIM
 277  * file, adds an entry to the lookup table for the image metadata, updates the
 278  * image count in the header, and selects the new image.
 279  *
 280  * Does not update the XML data.
 281  *
 282  * @w:            The WIMStruct for the WIM file.
 283  * @root_dentry:  The root of the directory tree for the image.
 284  */
 285 static int add_new_dentry_tree(WIMStruct *w, struct dentry *root_dentry,
 286                                struct wim_security_data *sd)
 287 {
 288         struct lookup_table_entry *metadata_lte;
 289         struct image_metadata *imd;
 290         struct image_metadata *new_imd;
 291         struct link_group_table *lgt;
 292
 293         DEBUG("Reallocating image metadata array for image_count = %u",
 294               w->hdr.image_count + 1);
 295         imd = CALLOC((w->hdr.image_count + 1), sizeof(struct image_metadata));
 296
 297         if (!imd) {
 298                 ERROR("Failed to allocate memory for new image metadata array");
 299                 return WIMLIB_ERR_NOMEM;
 300         }
 301
 302         memcpy(imd, w->image_metadata,
 303                w->hdr.image_count * sizeof(struct image_metadata));
 304
 305         metadata_lte = new_lookup_table_entry();
 306         if (!metadata_lte)
 307                 goto out_free_imd;
 308
 309         lgt = new_link_group_table(9001);
 310         if (!lgt)
 311                 goto out_free_security_data;
 312
 313         metadata_lte->resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
 314         random_hash(metadata_lte->hash);
 315         lookup_table_insert(w->lookup_table, metadata_lte);
 316
 317         new_imd = &imd[w->hdr.image_count];
 318
 319         new_imd->root_dentry    = root_dentry;
 320         new_imd->metadata_lte   = metadata_lte;
 321         new_imd->security_data  = sd;
 322         new_imd->lgt            = lgt;
 323         new_imd->modified       = true;
 324
 325         FREE(w->image_metadata);
 326         w->image_metadata       = imd;
 327         w->hdr.image_count++;
 328
 329         /* Change the current image to the new one. */
 330         return wimlib_select_image(w, w->hdr.image_count);
 331 out_free_security_data:
 332         FREE(sd);
 333 out_free_metadata_lte:
 334         FREE(metadata_lte);
 335 out_free_imd:
 336         FREE(imd);
 337         return WIMLIB_ERR_NOMEM;
 338
 339 }
 340
 341 /*
 342  * Copies an image, or all the images, from a WIM file, into another WIM file.
 343  */
 344 WIMLIBAPI int wimlib_export_image(WIMStruct *src_wim,
 345                                   int src_image,
 346                                   WIMStruct *dest_wim,
 347                                   const char *dest_name,
 348                                   const char *dest_description,
 349                                   int flags)
 350 {
 351         int i;
 352         int ret;
 353         struct dentry *root;
 354         struct wim_pair wims;
 355         struct wim_security_data *sd;
 356
 357         if (src_image == WIM_ALL_IMAGES) {
 358                 if (src_wim->hdr.image_count > 1) {
 359
 360                         /* multi-image export. */
 361
 362                         if ((flags & WIMLIB_EXPORT_FLAG_BOOT) &&
 363                               (src_wim->hdr.boot_idx == 0))
 364                         {
 365                                 /* Specifying the boot flag on a multi-image
 366                                  * source WIM makes the boot index default to
 367                                  * the bootable image in the source WIM.  It is
 368                                  * an error if there is no such bootable image.
 369                                  * */
 370                                 ERROR("Cannot specify `boot' flag when "
 371                                       "exporting multiple images from a WIM "
 372                                       "with no bootable images");
 373                                 return WIMLIB_ERR_INVALID_PARAM;
 374                         }
 375                         if (dest_name || dest_description) {
 376                                 ERROR("Image name or image description was "
 377                                       "specified, but we are exporting "
 378                                       "multiple images");
 379                                 return WIMLIB_ERR_INVALID_PARAM;
 380                         }
 381                         for (i = 1; i <= src_wim->hdr.image_count; i++) {
 382                                 int export_flags = flags;
 383
 384                                 if (i != src_wim->hdr.boot_idx)
 385                                         export_flags &= ~WIMLIB_EXPORT_FLAG_BOOT;
 386
 387                                 ret = wimlib_export_image(src_wim, i, dest_wim,
 388                                                           NULL,
 389                                                           dest_description,
 390                                                           export_flags);
 391                                 if (ret != 0)
 392                                         return ret;
 393                         }
 394                         return 0;
 395                 } else {
 396                         src_image = 1;
 397                 }
 398         }
 399
 400         ret = wimlib_select_image(src_wim, src_image);
 401         if (ret != 0) {
 402                 ERROR("Could not select image %d from the WIM `%s' "
 403                       "to export it", src_image, src_wim->filename);
 404                 return ret;
 405         }
 406
 407         if (!dest_name) {
 408                 dest_name = wimlib_get_image_name(src_wim, src_image);
 409                 DEBUG("Using name `%s' for source image %d",
 410                       dest_name, src_image);
 411         }
 412
 413         DEBUG("Exporting image %d from `%s'", src_image, src_wim->filename);
 414
 415         if (wimlib_image_name_in_use(dest_wim, dest_name)) {
 416                 ERROR("There is already an image named `%s' in the "
 417                       "destination WIM", dest_name);
 418                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 419         }
 420
 421
 422         /* Cleaning up here on failure would be hard.  For example, we could
 423          * fail to allocate memory in add_lte_to_dest_wim(),
 424          * leaving the lookup table entries in the destination WIM in an
 425          * inconsistent state.  Until these issues can be resolved,
 426          * wimlib_export_image() is documented as leaving dest_wim is an
 427          * indeterminate state.  */
 428         root = wim_root_dentry(src_wim);
 429         sd = wim_security_data(src_wim);
 430         for_dentry_in_tree(root, increment_dentry_refcnt, NULL);
 431         wims.src_wim = src_wim;
 432         wims.dest_wim = dest_wim;
 433         ret = for_dentry_in_tree(root, add_lte_to_dest_wim, &wims);
 434         if (ret != 0)
 435                 return ret;
 436         ret = add_new_dentry_tree(dest_wim, root, sd);
 437         if (ret != 0)
 438                 return ret;
 439         sd->refcnt++;
 440
 441         if (flags & WIMLIB_EXPORT_FLAG_BOOT) {
 442                 DEBUG("Setting boot_idx to %d", dest_wim->hdr.image_count);
 443                 dest_wim->hdr.boot_idx = dest_wim->hdr.image_count;
 444         }
 445
 446         return xml_export_image(src_wim->wim_info, src_image, &dest_wim->wim_info,
 447                                 dest_name, dest_description);
 448 }
 449
 450 /*
 451  * Deletes an image from the WIM.
 452  */
 453 WIMLIBAPI int wimlib_delete_image(WIMStruct *w, int image)
 454 {
 455         int num_images;
 456         int i;
 457         int ret;
 458
 459         if (image == WIM_ALL_IMAGES) {
 460                 num_images = w->hdr.image_count;
 461                 for (i = 1; i <= num_images; i++) {
 462                         /* Always delete the first image, since by the end
 463                          * there won't be any more than that!  */
 464                         ret = wimlib_delete_image(w, 1);
 465                         if (ret != 0)
 466                                 return ret;
 467                 }
 468                 return 0;
 469         }
 470
 471         DEBUG("Deleting image %d", image);
 472
 473         /* Even if the dentry tree is not allocated, we must select it (and
 474          * therefore allocate it) so that we can decrement the reference counts
 475          * in the lookup table.  */
 476         ret = wimlib_select_image(w, image);
 477         if (ret != 0)
 478                 return ret;
 479
 480         /* Free the dentry tree, any lookup table entries that have their
 481          * refcnt decremented to 0, and the security data. */
 482         destroy_image_metadata(wim_get_current_image_metadata(w),
 483                                w->lookup_table);
 484
 485         /* Get rid of the empty slot in the image metadata array. */
 486         memmove(&w->image_metadata[image - 1], &w->image_metadata[image],
 487                 (w->hdr.image_count - image) * sizeof(struct image_metadata));
 488
 489         /* Decrement the image count. */
 490         if (--w->hdr.image_count == 0) {
 491                 FREE(w->image_metadata);
 492                 w->image_metadata = NULL;
 493         }
 494
 495         /* Fix the boot index. */
 496         if (w->hdr.boot_idx == image)
 497                 w->hdr.boot_idx = 0;
 498         else if (w->hdr.boot_idx > image)
 499                 w->hdr.boot_idx--;
 500
 501         w->current_image = WIM_NO_IMAGE;
 502
 503         /* Remove the image from the XML information. */
 504         xml_delete_image(&w->wim_info, image);
 505         return 0;
 506 }
 507
 508 enum pattern_type {
 509         NONE = 0,
 510         EXCLUSION_LIST,
 511         EXCLUSION_EXCEPTION,
 512         COMPRESSION_EXCLUSION_LIST,
 513         ALIGNMENT_LIST,
 514 };
 515
 516 static const char *default_config =
 517 "[ExclusionList]\n"
 518 "\\$ntfs.log\n"
 519 "\\hiberfil.sys\n"
 520 "\\pagefile.sys\n"
 521 "\"\\System Volume Information\"\n"
 522 "\\RECYCLER\n"
 523 "\\Windows\\CSC\n"
 524 "\n"
 525 "[CompressionExclusionList]\n"
 526 "*.mp3\n"
 527 "*.zip\n"
 528 "*.cab\n"
 529 "\\WINDOWS\\inf\\*.pnf\n";
 530
 531 static void destroy_pattern_list(struct pattern_list *list)
 532 {
 533         FREE(list->pats);
 534 }
 535
 536 static void destroy_capture_config(struct capture_config *config)
 537 {
 538         destroy_pattern_list(&config->exclusion_list);
 539         destroy_pattern_list(&config->exclusion_exception);
 540         destroy_pattern_list(&config->compression_exclusion_list);
 541         destroy_pattern_list(&config->alignment_list);
 542         FREE(config->config_str);
 543         FREE(config->prefix);
 544         memset(config, 0, sizeof(*config));
 545 }
 546
 547 static int pattern_list_add_pattern(struct pattern_list *list,
 548                                     const char *pattern)
 549 {
 550         const char **pats;
 551         if (list->num_pats >= list->num_allocated_pats) {
 552                 pats = REALLOC(list->pats,
 553                                sizeof(list->pats[0]) * (list->num_allocated_pats + 8));
 554                 if (!pats)
 555                         return WIMLIB_ERR_NOMEM;
 556                 list->num_allocated_pats += 8;
 557                 list->pats = pats;
 558         }
 559         list->pats[list->num_pats++] = pattern;
 560         return 0;
 561 }
 562
 563 static int init_capture_config(const char *_config_str, size_t config_len,
 564                                const char *_prefix, struct capture_config *config)
 565 {
 566         char *config_str;
 567         char *prefix;
 568         char *p;
 569         char *eol;
 570         char *next_p;
 571         size_t next_bytes_remaining;
 572         size_t bytes_remaining;
 573         enum pattern_type type = NONE;
 574         int ret;
 575         unsigned long line_no = 0;
 576
 577         DEBUG("config_len = %zu", config_len);
 578         bytes_remaining = config_len;
 579         memset(config, 0, sizeof(*config));
 580         config_str = MALLOC(config_len);
 581         if (!config_str) {
 582                 ERROR("Could not duplicate capture config string");
 583                 return WIMLIB_ERR_NOMEM;
 584         }
 585         prefix = STRDUP(_prefix);
 586         if (!prefix) {
 587                 FREE(config_str);
 588                 return WIMLIB_ERR_NOMEM;
 589         }
 590
 591         memcpy(config_str, _config_str, config_len);
 592         next_p = config_str;
 593         config->config_str = config_str;
 594         config->prefix = prefix;
 595         config->prefix_len = strlen(prefix);
 596         while (bytes_remaining) {
 597                 line_no++;
 598                 p = next_p;
 599                 eol = memchr(p, '\n', bytes_remaining);
 600                 if (!eol) {
 601                         ERROR("Expected end-of-line in capture config file on "
 602                               "line %lu", line_no);
 603                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 604                         goto out_destroy;
 605                 }
 606
 607                 next_p = eol + 1;
 608                 bytes_remaining -= (eol - p) + 1;
 609                 if (eol == p)
 610                         continue;
 611
 612                 if (*(eol - 1) == '\r')
 613                         eol--;
 614                 *eol = '\0';
 615
 616                 /* Translate backslash to forward slash */
 617                 for (char *pp = p; pp != eol; pp++)
 618                         if (*pp == '\\')
 619                                 *pp = '/';
 620
 621                 /* Remove drive letter */
 622                 if (eol - p > 2 && isalpha(*p) && *(p + 1) == ':')
 623                         p += 2;
 624
 625                 if (strcmp(p, "[ExclusionList]") == 0)
 626                         type = EXCLUSION_LIST;
 627                 else if (strcmp(p, "[ExclusionException]") == 0)
 628                         type = EXCLUSION_EXCEPTION;
 629                 else if (strcmp(p, "[CompressionExclusionList]") == 0)
 630                         type = COMPRESSION_EXCLUSION_LIST;
 631                 else if (strcmp(p, "[AlignmentList]") == 0)
 632                         type = ALIGNMENT_LIST;
 633                 else switch (type) {
 634                 case EXCLUSION_LIST:
 635                         DEBUG("Adding pattern \"%s\" to exclusion list", p);
 636                         ret = pattern_list_add_pattern(&config->exclusion_list, p);
 637                         break;
 638                 case EXCLUSION_EXCEPTION:
 639                         DEBUG("Adding pattern \"%s\" to exclusion exception list", p);
 640                         ret = pattern_list_add_pattern(&config->exclusion_exception, p);
 641                         break;
 642                 case COMPRESSION_EXCLUSION_LIST:
 643                         DEBUG("Adding pattern \"%s\" to compression exclusion list", p);
 644                         ret = pattern_list_add_pattern(&config->compression_exclusion_list, p);
 645                         break;
 646                 case ALIGNMENT_LIST:
 647                         DEBUG("Adding pattern \"%s\" to alignment list", p);
 648                         ret = pattern_list_add_pattern(&config->alignment_list, p);
 649                         break;
 650                 default:
 651                         ERROR("Line %lu of capture configuration is not "
 652                               "in a block (such as [ExclusionList])",
 653                               line_no);
 654                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 655                         goto out_destroy;
 656                 }
 657                 if (ret != 0)
 658                         goto out_destroy;
 659         }
 660         return 0;
 661 out_destroy:
 662         destroy_capture_config(config);
 663         return ret;
 664 }
 665
 666 static bool match_pattern(const char *path, const char *path_basename,
 667                           const struct pattern_list *list)
 668 {
 669         for (size_t i = 0; i < list->num_pats; i++) {
 670                 const char *pat = list->pats[i];
 671                 const char *string;
 672                 if (pat[0] == '/')
 673                         /* Absolute path from root of capture */
 674                         string = path;
 675                 else {
 676                         if (strchr(pat, '/'))
 677                                 /* Relative path from root of capture */
 678                                 string = path + 1;
 679                         else
 680                                 /* A file name pattern */
 681                                 string = path_basename;
 682                 }
 683                 if (fnmatch(pat, string, FNM_PATHNAME
 684                         #ifdef FNM_CASEFOLD
 685                                         | FNM_CASEFOLD
 686                         #endif
 687                         ) == 0)
 688                 {
 689                         DEBUG("`%s' matches the pattern \"%s\"",
 690                               string, pat);
 691                         return true;
 692                 }
 693         }
 694         return false;
 695 }
 696
 697 static void print_pattern_list(const struct pattern_list *list)
 698 {
 699         for (size_t i = 0; i < list->num_pats; i++)
 700                 printf("    %s\n", list->pats[i]);
 701 }
 702
 703 static void print_capture_config(const struct capture_config *config)
 704 {
 705         if (config->exclusion_list.num_pats) {
 706                 puts("Files or folders excluded from image capture:");
 707                 print_pattern_list(&config->exclusion_list);
 708                 putchar('\n');
 709         }
 710 }
 711
 712 bool exclude_path(const char *path, const struct capture_config *config,
 713                   bool exclude_prefix)
 714 {
 715         const char *basename = path_basename(path);
 716         if (exclude_prefix) {
 717                 wimlib_assert(strlen(path) >= config->prefix_len);
 718                 if (memcmp(config->prefix, path, config->prefix_len) == 0
 719                      && path[config->prefix_len] == '/')
 720                         path += config->prefix_len;
 721         }
 722         return match_pattern(path, basename, &config->exclusion_list) &&
 723                 !match_pattern(path, basename, &config->exclusion_exception);
 724
 725 }
 726
 727
 728
 729 int do_add_image(WIMStruct *w, const char *dir, const char *name,
 730                  const char *config_str, size_t config_len,
 731                  int flags,
 732                  int (*capture_tree)(struct dentry **, const char *,
 733                                      struct lookup_table *,
 734                                      struct wim_security_data *,
 735                                      const struct capture_config *,
 736                                      int, void *),
 737                  void *extra_arg)
 738 {
 739         struct dentry *root_dentry = NULL;
 740         struct image_metadata *imd;
 741         struct wim_security_data *sd;
 742         struct capture_config config;
 743         int ret;
 744
 745         DEBUG("Adding dentry tree from dir `%s'.", dir);
 746
 747         if (!name || !*name) {
 748                 ERROR("Must specify a non-empty string for the image name");
 749                 return WIMLIB_ERR_INVALID_PARAM;
 750         }
 751         if (!dir) {
 752                 ERROR("Must specify the name of a directory");
 753                 return WIMLIB_ERR_INVALID_PARAM;
 754         }
 755
 756         if (wimlib_image_name_in_use(w, name)) {
 757                 ERROR("There is already an image named \"%s\" in `%s'",
 758                       name, w->filename);
 759                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 760         }
 761
 762         DEBUG("Initializing capture configuration");
 763         if (!config_str) {
 764                 DEBUG("Using default capture configuration");
 765                 config_str = default_config;
 766                 config_len = strlen(default_config);
 767         }
 768         ret = init_capture_config(config_str, config_len, dir, &config);
 769         if (ret != 0)
 770                 return ret;
 771         print_capture_config(&config);
 772
 773         DEBUG("Allocating security data");
 774
 775         sd = CALLOC(1, sizeof(struct wim_security_data));
 776         if (!sd)
 777                 goto out_destroy_config;
 778         sd->total_length = 8;
 779         sd->refcnt = 1;
 780
 781         DEBUG("Building dentry tree.");
 782         ret = (*capture_tree)(&root_dentry, dir, w->lookup_table, sd,
 783                               &config, flags | WIMLIB_ADD_IMAGE_FLAG_ROOT,
 784                               extra_arg);
 785         destroy_capture_config(&config);
 786
 787         if (ret != 0) {
 788                 ERROR("Failed to build dentry tree for `%s'", dir);
 789                 goto out_free_dentry_tree;
 790         }
 791
 792         DEBUG("Calculating full paths of dentries.");
 793         ret = for_dentry_in_tree(root_dentry, calculate_dentry_full_path, NULL);
 794         if (ret != 0)
 795                 goto out_free_dentry_tree;
 796
 797         ret = add_new_dentry_tree(w, root_dentry, sd);
 798         if (ret != 0)
 799                 goto out_free_dentry_tree;
 800
 801         DEBUG("Inserting dentries into hard link group table");
 802         ret = for_dentry_in_tree(root_dentry, link_group_table_insert,
 803                                  w->image_metadata[w->hdr.image_count - 1].lgt);
 804         if (ret != 0)
 805                 goto out_destroy_imd;
 806         DEBUG("Assigning hard link groups");
 807         assign_link_groups(w->image_metadata[w->hdr.image_count - 1].lgt);
 808
 809         if (flags & WIMLIB_ADD_IMAGE_FLAG_BOOT)
 810                 wimlib_set_boot_idx(w, w->hdr.image_count);
 811
 812         ret = xml_add_image(w, root_dentry, name);
 813         if (ret != 0)
 814                 goto out_destroy_imd;
 815
 816         return 0;
 817 out_destroy_imd:
 818         destroy_image_metadata(&w->image_metadata[w->hdr.image_count - 1],
 819                                w->lookup_table);
 820         w->hdr.image_count--;
 821         return ret;
 822 out_free_dentry_tree:
 823         free_dentry_tree(root_dentry, w->lookup_table);
 824 out_free_sd:
 825         free_security_data(sd);
 826 out_destroy_config:
 827         destroy_capture_config(&config);
 828         return ret;
 829 }
 830
 831 /*
 832  * Adds an image to a WIM file from a directory tree on disk.
 833  */
 834 WIMLIBAPI int wimlib_add_image(WIMStruct *w, const char *dir,
 835                                const char *name, const char *config_str,
 836                                size_t config_len, int flags)
 837 {
 838         return do_add_image(w, dir, name, config_str, config_len, flags,
 839                             build_dentry_tree, NULL);
 840 }