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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         const char *filename;
  89
  90         if (exclude_path(root_disk_path, config, true)) {
  91                 if (add_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
  92                         printf("Excluding file `%s' from capture\n",
  93                                root_disk_path);
  94                 *root_ret = NULL;
  95                 return 0;
  96         }
  97
  98
  99         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)
 100                 stat_fn = stat;
 101         else
 102                 stat_fn = lstat;
 103
 104         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 105                 printf("Scanning `%s'\n", root_disk_path);
 106
 107
 108         ret = (*stat_fn)(root_disk_path, &root_stbuf);
 109         if (ret != 0) {
 110                 ERROR_WITH_ERRNO("Failed to stat `%s'", root_disk_path);
 111                 return WIMLIB_ERR_STAT;
 112         }
 113
 114         if ((add_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) &&
 115               !S_ISDIR(root_stbuf.st_mode)) {
 116                 ERROR("`%s' is not a directory", root_disk_path);
 117                 return WIMLIB_ERR_NOTDIR;
 118         }
 119         if (!S_ISREG(root_stbuf.st_mode) && !S_ISDIR(root_stbuf.st_mode)
 120             && !S_ISLNK(root_stbuf.st_mode)) {
 121                 ERROR("`%s' is not a regular file, directory, or symbolic link.",
 122                       root_disk_path);
 123                 return WIMLIB_ERR_SPECIAL_FILE;
 124         }
 125
 126         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT)
 127                 filename = "";
 128         else
 129                 filename = path_basename(root_disk_path);
 130
 131         root = new_dentry(filename);
 132         if (!root)
 133                 return WIMLIB_ERR_NOMEM;
 134
 135         stbuf_to_dentry(&root_stbuf, root);
 136         add_flags &= ~WIMLIB_ADD_IMAGE_FLAG_ROOT;
 137         root->resolved = true;
 138
 139         if (dentry_is_directory(root)) {
 140                 /* Open the directory on disk */
 141                 DIR *dir;
 142                 struct dirent *p;
 143                 struct dentry *child;
 144
 145                 dir = opendir(root_disk_path);
 146                 if (!dir) {
 147                         ERROR_WITH_ERRNO("Failed to open the directory `%s'",
 148                                          root_disk_path);
 149                         return WIMLIB_ERR_OPEN;
 150                 }
 151
 152                 /* Buffer for names of files in directory. */
 153                 size_t len = strlen(root_disk_path);
 154                 char name[len + 1 + FILENAME_MAX + 1];
 155                 memcpy(name, root_disk_path, len);
 156                 name[len] = '/';
 157
 158                 /* Create a dentry for each entry in the directory on disk, and recurse
 159                  * to any subdirectories. */
 160                 while ((p = readdir(dir)) != NULL) {
 161                         if (p->d_name[0] == '.' && (p->d_name[1] == '\0'
 162                               || (p->d_name[1] == '.' && p->d_name[2] == '\0')))
 163                                         continue;
 164                         strcpy(name + len + 1, p->d_name);
 165                         ret = build_dentry_tree(&child, name, lookup_table,
 166                                                 sd, config,
 167                                                 add_flags, extra_arg);
 168                         if (ret != 0)
 169                                 break;
 170                         if (child)
 171                                 link_dentry(child, root);
 172                 }
 173                 closedir(dir);
 174         } else if (dentry_is_symlink(root)) {
 175                 /* Archiving a symbolic link */
 176                 char deref_name_buf[4096];
 177                 ssize_t deref_name_len;
 178
 179                 deref_name_len = readlink(root_disk_path, deref_name_buf,
 180                                           sizeof(deref_name_buf) - 1);
 181                 if (deref_name_len == -1) {
 182                         ERROR_WITH_ERRNO("Failed to read target of "
 183                                          "symbolic link `%s'", root_disk_path);
 184                         return WIMLIB_ERR_READLINK;
 185                 }
 186                 deref_name_buf[deref_name_len] = '\0';
 187                 DEBUG("Read symlink `%s'", deref_name_buf);
 188                 ret = dentry_set_symlink(root, deref_name_buf,
 189                                          lookup_table, NULL);
 190         } else {
 191                 /* Regular file */
 192                 struct lookup_table_entry *lte;
 193                 u8 hash[SHA1_HASH_SIZE];
 194
 195                 /* Empty files do not have to have a lookup table entry. */
 196                 if (root_stbuf.st_size == 0)
 197                         goto out;
 198
 199                 /* For each regular file, we must check to see if the file is in
 200                  * the lookup table already; if it is, we increment its refcnt;
 201                  * otherwise, we create a new lookup table entry and insert it.
 202                  * */
 203                 ret = sha1sum(root_disk_path, hash);
 204                 if (ret != 0)
 205                         return ret;
 206
 207                 lte = __lookup_resource(lookup_table, hash);
 208                 if (lte) {
 209                         lte->refcnt++;
 210                         DEBUG("Add lte reference %u for `%s'", lte->refcnt,
 211                               root_disk_path);
 212                 } else {
 213                         char *file_on_disk = STRDUP(root_disk_path);
 214                         if (!file_on_disk) {
 215                                 ERROR("Failed to allocate memory for file path");
 216                                 return WIMLIB_ERR_NOMEM;
 217                         }
 218                         lte = new_lookup_table_entry();
 219                         if (!lte) {
 220                                 FREE(file_on_disk);
 221                                 return WIMLIB_ERR_NOMEM;
 222                         }
 223                         lte->file_on_disk = file_on_disk;
 224                         lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 225                         lte->resource_entry.original_size = root_stbuf.st_size;
 226                         lte->resource_entry.size = root_stbuf.st_size;
 227                         copy_hash(lte->hash, hash);
 228                         lookup_table_insert(lookup_table, lte);
 229                 }
 230                 root->lte = lte;
 231         }
 232 out:
 233         *root_ret = root;
 234         return ret;
 235 }
 236
 237 struct wim_pair {
 238         WIMStruct *src_wim;
 239         WIMStruct *dest_wim;
 240 };
 241
 242 /*
 243  * This function takes in a dentry that was previously located only in image(s)
 244  * in @src_wim, but now is being added to @dest_wim. If there is in fact already a
 245  * lookup table entry for this file in the lookup table of the destination WIM
 246  * file, we simply increment its reference count.  Otherwise, a new lookup table
 247  * entry is created that references the location of the file resource in the
 248  * source WIM file through the other_wim_fp field of the lookup table entry.
 249  */
 250 static int add_lte_to_dest_wim(struct dentry *dentry, void *arg)
 251 {
 252         WIMStruct *src_wim, *dest_wim;
 253
 254         src_wim = ((struct wim_pair*)arg)->src_wim;
 255         dest_wim = ((struct wim_pair*)arg)->dest_wim;
 256
 257         wimlib_assert(!dentry->resolved);
 258
 259         for (unsigned i = 0; i < (unsigned)dentry->num_ads + 1; i++) {
 260                 struct lookup_table_entry *src_lte, *dest_lte;
 261                 src_lte = dentry_stream_lte_unresolved(dentry, i,
 262                                                        src_wim->lookup_table);
 263                 if (!src_lte)
 264                         continue;
 265                 dest_lte = dentry_stream_lte_unresolved(dentry, i,
 266                                                         dest_wim->lookup_table);
 267                 if (dest_lte) {
 268                         dest_lte->refcnt++;
 269                 } else {
 270                         dest_lte = new_lookup_table_entry();
 271                         if (!dest_lte)
 272                                 return WIMLIB_ERR_NOMEM;
 273                         dest_lte->resource_location = RESOURCE_IN_WIM;
 274                         dest_lte->wim = src_wim;
 275                         memcpy(&dest_lte->resource_entry,
 276                                &src_lte->resource_entry,
 277                                sizeof(struct resource_entry));
 278                         copy_hash(dest_lte->hash,
 279                                   dentry_stream_hash_unresolved(dentry, i));
 280                         lookup_table_insert(dest_wim->lookup_table, dest_lte);
 281                 }
 282         }
 283         return 0;
 284 }
 285
 286 /*
 287  * Adds an image (given by its dentry tree) to the image metadata array of a WIM
 288  * file, adds an entry to the lookup table for the image metadata, updates the
 289  * image count in the header, and selects the new image.
 290  *
 291  * Does not update the XML data.
 292  *
 293  * @w:            The WIMStruct for the WIM file.
 294  * @root_dentry:  The root of the directory tree for the image.
 295  * @sd:           The security data for the image.
 296  */
 297 static int add_new_dentry_tree(WIMStruct *w, struct dentry *root_dentry,
 298                                struct wim_security_data *sd)
 299 {
 300         struct lookup_table_entry *metadata_lte;
 301         struct image_metadata *imd;
 302         struct image_metadata *new_imd;
 303         struct link_group_table *lgt;
 304
 305         DEBUG("Reallocating image metadata array for image_count = %u",
 306               w->hdr.image_count + 1);
 307         imd = CALLOC((w->hdr.image_count + 1), sizeof(struct image_metadata));
 308
 309         if (!imd) {
 310                 ERROR("Failed to allocate memory for new image metadata array");
 311                 return WIMLIB_ERR_NOMEM;
 312         }
 313
 314         memcpy(imd, w->image_metadata,
 315                w->hdr.image_count * sizeof(struct image_metadata));
 316
 317         metadata_lte = new_lookup_table_entry();
 318         if (!metadata_lte)
 319                 goto out_free_imd;
 320
 321         lgt = new_link_group_table(9001);
 322         if (!lgt)
 323                 goto out_free_metadata_lte;
 324
 325         metadata_lte->resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
 326         random_hash(metadata_lte->hash);
 327         lookup_table_insert(w->lookup_table, metadata_lte);
 328
 329         new_imd = &imd[w->hdr.image_count];
 330
 331         new_imd->root_dentry    = root_dentry;
 332         new_imd->metadata_lte   = metadata_lte;
 333         new_imd->security_data  = sd;
 334         new_imd->lgt            = lgt;
 335         new_imd->modified       = true;
 336
 337         FREE(w->image_metadata);
 338         w->image_metadata       = imd;
 339         w->hdr.image_count++;
 340
 341         /* Change the current image to the new one. */
 342         return wimlib_select_image(w, w->hdr.image_count);
 343 out_free_metadata_lte:
 344         FREE(metadata_lte);
 345 out_free_imd:
 346         FREE(imd);
 347         return WIMLIB_ERR_NOMEM;
 348
 349 }
 350
 351 /*
 352  * Copies an image, or all the images, from a WIM file, into another WIM file.
 353  */
 354 WIMLIBAPI int wimlib_export_image(WIMStruct *src_wim,
 355                                   int src_image,
 356                                   WIMStruct *dest_wim,
 357                                   const char *dest_name,
 358                                   const char *dest_description,
 359                                   int flags)
 360 {
 361         int i;
 362         int ret;
 363         struct dentry *root;
 364         struct wim_pair wims;
 365         struct wim_security_data *sd;
 366
 367         if (src_image == WIM_ALL_IMAGES) {
 368                 if (src_wim->hdr.image_count > 1) {
 369
 370                         /* multi-image export. */
 371
 372                         if ((flags & WIMLIB_EXPORT_FLAG_BOOT) &&
 373                               (src_wim->hdr.boot_idx == 0))
 374                         {
 375                                 /* Specifying the boot flag on a multi-image
 376                                  * source WIM makes the boot index default to
 377                                  * the bootable image in the source WIM.  It is
 378                                  * an error if there is no such bootable image.
 379                                  * */
 380                                 ERROR("Cannot specify `boot' flag when "
 381                                       "exporting multiple images from a WIM "
 382                                       "with no bootable images");
 383                                 return WIMLIB_ERR_INVALID_PARAM;
 384                         }
 385                         if (dest_name || dest_description) {
 386                                 ERROR("Image name or image description was "
 387                                       "specified, but we are exporting "
 388                                       "multiple images");
 389                                 return WIMLIB_ERR_INVALID_PARAM;
 390                         }
 391                         for (i = 1; i <= src_wim->hdr.image_count; i++) {
 392                                 int export_flags = flags;
 393
 394                                 if (i != src_wim->hdr.boot_idx)
 395                                         export_flags &= ~WIMLIB_EXPORT_FLAG_BOOT;
 396
 397                                 ret = wimlib_export_image(src_wim, i, dest_wim,
 398                                                           NULL,
 399                                                           dest_description,
 400                                                           export_flags);
 401                                 if (ret != 0)
 402                                         return ret;
 403                         }
 404                         return 0;
 405                 } else {
 406                         src_image = 1;
 407                 }
 408         }
 409
 410         ret = wimlib_select_image(src_wim, src_image);
 411         if (ret != 0) {
 412                 ERROR("Could not select image %d from the WIM `%s' "
 413                       "to export it", src_image, src_wim->filename);
 414                 return ret;
 415         }
 416
 417         if (!dest_name) {
 418                 dest_name = wimlib_get_image_name(src_wim, src_image);
 419                 DEBUG("Using name `%s' for source image %d",
 420                       dest_name, src_image);
 421         }
 422
 423         DEBUG("Exporting image %d from `%s'", src_image, src_wim->filename);
 424
 425         if (wimlib_image_name_in_use(dest_wim, dest_name)) {
 426                 ERROR("There is already an image named `%s' in the "
 427                       "destination WIM", dest_name);
 428                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 429         }
 430
 431
 432         /* Cleaning up here on failure would be hard.  For example, we could
 433          * fail to allocate memory in add_lte_to_dest_wim(),
 434          * leaving the lookup table entries in the destination WIM in an
 435          * inconsistent state.  Until these issues can be resolved,
 436          * wimlib_export_image() is documented as leaving dest_wim is an
 437          * indeterminate state.  */
 438         root = wim_root_dentry(src_wim);
 439         sd = wim_security_data(src_wim);
 440         for_dentry_in_tree(root, increment_dentry_refcnt, NULL);
 441         wims.src_wim = src_wim;
 442         wims.dest_wim = dest_wim;
 443         ret = for_dentry_in_tree(root, add_lte_to_dest_wim, &wims);
 444         if (ret != 0)
 445                 return ret;
 446         ret = add_new_dentry_tree(dest_wim, root, sd);
 447         if (ret != 0)
 448                 return ret;
 449         sd->refcnt++;
 450
 451         if (flags & WIMLIB_EXPORT_FLAG_BOOT) {
 452                 DEBUG("Setting boot_idx to %d", dest_wim->hdr.image_count);
 453                 dest_wim->hdr.boot_idx = dest_wim->hdr.image_count;
 454         }
 455
 456         return xml_export_image(src_wim->wim_info, src_image, &dest_wim->wim_info,
 457                                 dest_name, dest_description);
 458 }
 459
 460 /*
 461  * Deletes an image from the WIM.
 462  */
 463 WIMLIBAPI int wimlib_delete_image(WIMStruct *w, int image)
 464 {
 465         int num_images;
 466         int i;
 467         int ret;
 468
 469         if (image == WIM_ALL_IMAGES) {
 470                 num_images = w->hdr.image_count;
 471                 for (i = 1; i <= num_images; i++) {
 472                         /* Always delete the first image, since by the end
 473                          * there won't be any more than that!  */
 474                         ret = wimlib_delete_image(w, 1);
 475                         if (ret != 0)
 476                                 return ret;
 477                 }
 478                 return 0;
 479         }
 480
 481         DEBUG("Deleting image %d", image);
 482
 483         /* Even if the dentry tree is not allocated, we must select it (and
 484          * therefore allocate it) so that we can decrement the reference counts
 485          * in the lookup table.  */
 486         ret = wimlib_select_image(w, image);
 487         if (ret != 0)
 488                 return ret;
 489
 490         /* Free the dentry tree, any lookup table entries that have their
 491          * refcnt decremented to 0, and the security data. */
 492         destroy_image_metadata(wim_get_current_image_metadata(w),
 493                                w->lookup_table);
 494
 495         /* Get rid of the empty slot in the image metadata array. */
 496         memmove(&w->image_metadata[image - 1], &w->image_metadata[image],
 497                 (w->hdr.image_count - image) * sizeof(struct image_metadata));
 498
 499         /* Decrement the image count. */
 500         if (--w->hdr.image_count == 0) {
 501                 FREE(w->image_metadata);
 502                 w->image_metadata = NULL;
 503         }
 504
 505         /* Fix the boot index. */
 506         if (w->hdr.boot_idx == image)
 507                 w->hdr.boot_idx = 0;
 508         else if (w->hdr.boot_idx > image)
 509                 w->hdr.boot_idx--;
 510
 511         w->current_image = WIM_NO_IMAGE;
 512
 513         /* Remove the image from the XML information. */
 514         xml_delete_image(&w->wim_info, image);
 515         return 0;
 516 }
 517
 518 enum pattern_type {
 519         NONE = 0,
 520         EXCLUSION_LIST,
 521         EXCLUSION_EXCEPTION,
 522         COMPRESSION_EXCLUSION_LIST,
 523         ALIGNMENT_LIST,
 524 };
 525
 526 static const char *default_config =
 527 "[ExclusionList]\n"
 528 "\\$ntfs.log\n"
 529 "\\hiberfil.sys\n"
 530 "\\pagefile.sys\n"
 531 "\\System Volume Information\n"
 532 "\\RECYCLER\n"
 533 "\\Windows\\CSC\n"
 534 "\n"
 535 "[CompressionExclusionList]\n"
 536 "*.mp3\n"
 537 "*.zip\n"
 538 "*.cab\n"
 539 "\\WINDOWS\\inf\\*.pnf\n";
 540
 541 static void destroy_pattern_list(struct pattern_list *list)
 542 {
 543         FREE(list->pats);
 544 }
 545
 546 static void destroy_capture_config(struct capture_config *config)
 547 {
 548         destroy_pattern_list(&config->exclusion_list);
 549         destroy_pattern_list(&config->exclusion_exception);
 550         destroy_pattern_list(&config->compression_exclusion_list);
 551         destroy_pattern_list(&config->alignment_list);
 552         FREE(config->config_str);
 553         FREE(config->prefix);
 554         memset(config, 0, sizeof(*config));
 555 }
 556
 557 static int pattern_list_add_pattern(struct pattern_list *list,
 558                                     const char *pattern)
 559 {
 560         const char **pats;
 561         if (list->num_pats >= list->num_allocated_pats) {
 562                 pats = REALLOC(list->pats,
 563                                sizeof(list->pats[0]) * (list->num_allocated_pats + 8));
 564                 if (!pats)
 565                         return WIMLIB_ERR_NOMEM;
 566                 list->num_allocated_pats += 8;
 567                 list->pats = pats;
 568         }
 569         list->pats[list->num_pats++] = pattern;
 570         return 0;
 571 }
 572
 573 static int init_capture_config(const char *_config_str, size_t config_len,
 574                                const char *_prefix, struct capture_config *config)
 575 {
 576         char *config_str;
 577         char *prefix;
 578         char *p;
 579         char *eol;
 580         char *next_p;
 581         size_t bytes_remaining;
 582         enum pattern_type type = NONE;
 583         int ret;
 584         unsigned long line_no = 0;
 585
 586         DEBUG("config_len = %zu", config_len);
 587         bytes_remaining = config_len;
 588         memset(config, 0, sizeof(*config));
 589         config_str = MALLOC(config_len);
 590         if (!config_str) {
 591                 ERROR("Could not duplicate capture config string");
 592                 return WIMLIB_ERR_NOMEM;
 593         }
 594         prefix = STRDUP(_prefix);
 595         if (!prefix) {
 596                 FREE(config_str);
 597                 return WIMLIB_ERR_NOMEM;
 598         }
 599
 600         memcpy(config_str, _config_str, config_len);
 601         next_p = config_str;
 602         config->config_str = config_str;
 603         config->prefix = prefix;
 604         config->prefix_len = strlen(prefix);
 605         while (bytes_remaining) {
 606                 line_no++;
 607                 p = next_p;
 608                 eol = memchr(p, '\n', bytes_remaining);
 609                 if (!eol) {
 610                         ERROR("Expected end-of-line in capture config file on "
 611                               "line %lu", line_no);
 612                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 613                         goto out_destroy;
 614                 }
 615
 616                 next_p = eol + 1;
 617                 bytes_remaining -= (eol - p) + 1;
 618                 if (eol == p)
 619                         continue;
 620
 621                 if (*(eol - 1) == '\r')
 622                         eol--;
 623                 *eol = '\0';
 624
 625                 /* Translate backslash to forward slash */
 626                 for (char *pp = p; pp != eol; pp++)
 627                         if (*pp == '\\')
 628                                 *pp = '/';
 629
 630                 /* Remove drive letter */
 631                 if (eol - p > 2 && isalpha(*p) && *(p + 1) == ':')
 632                         p += 2;
 633
 634                 ret = 0;
 635                 if (strcmp(p, "[ExclusionList]") == 0)
 636                         type = EXCLUSION_LIST;
 637                 else if (strcmp(p, "[ExclusionException]") == 0)
 638                         type = EXCLUSION_EXCEPTION;
 639                 else if (strcmp(p, "[CompressionExclusionList]") == 0)
 640                         type = COMPRESSION_EXCLUSION_LIST;
 641                 else if (strcmp(p, "[AlignmentList]") == 0)
 642                         type = ALIGNMENT_LIST;
 643                 else if (p[0] == '[' && strrchr(p, ']')) {
 644                         ERROR("Unknown capture configuration section `%s'", p);
 645                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 646                         goto out_destroy;
 647                 } else switch (type) {
 648                 case EXCLUSION_LIST:
 649                         DEBUG("Adding pattern \"%s\" to exclusion list", p);
 650                         ret = pattern_list_add_pattern(&config->exclusion_list, p);
 651                         break;
 652                 case EXCLUSION_EXCEPTION:
 653                         DEBUG("Adding pattern \"%s\" to exclusion exception list", p);
 654                         ret = pattern_list_add_pattern(&config->exclusion_exception, p);
 655                         break;
 656                 case COMPRESSION_EXCLUSION_LIST:
 657                         DEBUG("Adding pattern \"%s\" to compression exclusion list", p);
 658                         ret = pattern_list_add_pattern(&config->compression_exclusion_list, p);
 659                         break;
 660                 case ALIGNMENT_LIST:
 661                         DEBUG("Adding pattern \"%s\" to alignment list", p);
 662                         ret = pattern_list_add_pattern(&config->alignment_list, p);
 663                         break;
 664                 default:
 665                         ERROR("Line %lu of capture configuration is not "
 666                               "in a block (such as [ExclusionList])",
 667                               line_no);
 668                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 669                         goto out_destroy;
 670                 }
 671                 if (ret != 0)
 672                         goto out_destroy;
 673         }
 674         return 0;
 675 out_destroy:
 676         destroy_capture_config(config);
 677         return ret;
 678 }
 679
 680 static bool match_pattern(const char *path, const char *path_basename,
 681                           const struct pattern_list *list)
 682 {
 683         for (size_t i = 0; i < list->num_pats; i++) {
 684                 const char *pat = list->pats[i];
 685                 const char *string;
 686                 if (pat[0] == '/')
 687                         /* Absolute path from root of capture */
 688                         string = path;
 689                 else {
 690                         if (strchr(pat, '/'))
 691                                 /* Relative path from root of capture */
 692                                 string = path + 1;
 693                         else
 694                                 /* A file name pattern */
 695                                 string = path_basename;
 696                 }
 697                 if (fnmatch(pat, string, FNM_PATHNAME
 698                         #ifdef FNM_CASEFOLD
 699                                         | FNM_CASEFOLD
 700                         #endif
 701                         ) == 0)
 702                 {
 703                         DEBUG("`%s' matches the pattern \"%s\"",
 704                               string, pat);
 705                         return true;
 706                 }
 707         }
 708         return false;
 709 }
 710
 711 static void print_pattern_list(const struct pattern_list *list)
 712 {
 713         for (size_t i = 0; i < list->num_pats; i++)
 714                 printf("    %s\n", list->pats[i]);
 715 }
 716
 717 static void print_capture_config(const struct capture_config *config)
 718 {
 719         if (config->exclusion_list.num_pats) {
 720                 puts("Files or folders excluded from image capture:");
 721                 print_pattern_list(&config->exclusion_list);
 722                 putchar('\n');
 723         }
 724 }
 725
 726 bool exclude_path(const char *path, const struct capture_config *config,
 727                   bool exclude_prefix)
 728 {
 729         const char *basename = path_basename(path);
 730         if (exclude_prefix) {
 731                 wimlib_assert(strlen(path) >= config->prefix_len);
 732                 if (memcmp(config->prefix, path, config->prefix_len) == 0
 733                      && path[config->prefix_len] == '/')
 734                         path += config->prefix_len;
 735         }
 736         return match_pattern(path, basename, &config->exclusion_list) &&
 737                 !match_pattern(path, basename, &config->exclusion_exception);
 738
 739 }
 740
 741
 742
 743 int do_add_image(WIMStruct *w, const char *dir, const char *name,
 744                  const char *config_str, size_t config_len,
 745                  int flags,
 746                  int (*capture_tree)(struct dentry **, const char *,
 747                                      struct lookup_table *,
 748                                      struct wim_security_data *,
 749                                      const struct capture_config *,
 750                                      int, void *),
 751                  void *extra_arg)
 752 {
 753         struct dentry *root_dentry = NULL;
 754         struct wim_security_data *sd;
 755         struct capture_config config;
 756         struct link_group_table *lgt;
 757         int ret;
 758
 759         DEBUG("Adding dentry tree from dir `%s'.", dir);
 760
 761         if (!name || !*name) {
 762                 ERROR("Must specify a non-empty string for the image name");
 763                 return WIMLIB_ERR_INVALID_PARAM;
 764         }
 765         if (!dir) {
 766                 ERROR("Must specify the name of a directory");
 767                 return WIMLIB_ERR_INVALID_PARAM;
 768         }
 769
 770         if (wimlib_image_name_in_use(w, name)) {
 771                 ERROR("There is already an image named \"%s\" in `%s'",
 772                       name, w->filename);
 773                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 774         }
 775
 776         DEBUG("Initializing capture configuration");
 777         if (!config_str) {
 778                 DEBUG("Using default capture configuration");
 779                 config_str = default_config;
 780                 config_len = strlen(default_config);
 781         }
 782         ret = init_capture_config(config_str, config_len, dir, &config);
 783         if (ret != 0)
 784                 return ret;
 785         print_capture_config(&config);
 786
 787         DEBUG("Allocating security data");
 788
 789         sd = CALLOC(1, sizeof(struct wim_security_data));
 790         if (!sd)
 791                 goto out_destroy_config;
 792         sd->total_length = 8;
 793         sd->refcnt = 1;
 794
 795         DEBUG("Building dentry tree.");
 796         ret = (*capture_tree)(&root_dentry, dir, w->lookup_table, sd,
 797                               &config, flags | WIMLIB_ADD_IMAGE_FLAG_ROOT,
 798                               extra_arg);
 799         destroy_capture_config(&config);
 800
 801         if (ret != 0) {
 802                 ERROR("Failed to build dentry tree for `%s'", dir);
 803                 goto out_free_dentry_tree;
 804         }
 805
 806         DEBUG("Calculating full paths of dentries.");
 807         ret = for_dentry_in_tree(root_dentry, calculate_dentry_full_path, NULL);
 808         if (ret != 0)
 809                 goto out_free_dentry_tree;
 810
 811         ret = add_new_dentry_tree(w, root_dentry, sd);
 812         if (ret != 0)
 813                 goto out_free_dentry_tree;
 814
 815         lgt = w->image_metadata[w->hdr.image_count - 1].lgt;
 816         DEBUG("Inserting dentries into hard link group table");
 817         ret = for_dentry_in_tree(root_dentry, link_group_table_insert, lgt);
 818
 819         if (ret != 0)
 820                 goto out_destroy_imd;
 821
 822         DEBUG("Cleanup up the hard link groups");
 823         ret = fix_link_groups(lgt);
 824         if (ret != 0)
 825                 goto out_destroy_imd;
 826
 827         DEBUG("Assigning hard link group IDs");
 828         assign_link_group_ids(w->image_metadata[w->hdr.image_count - 1].lgt);
 829
 830         if (flags & WIMLIB_ADD_IMAGE_FLAG_BOOT)
 831                 wimlib_set_boot_idx(w, w->hdr.image_count);
 832
 833         ret = xml_add_image(w, root_dentry, name);
 834         if (ret != 0)
 835                 goto out_destroy_imd;
 836
 837         return 0;
 838 out_destroy_imd:
 839         destroy_image_metadata(&w->image_metadata[w->hdr.image_count - 1],
 840                                w->lookup_table);
 841         w->hdr.image_count--;
 842         return ret;
 843 out_free_dentry_tree:
 844         free_dentry_tree(root_dentry, w->lookup_table);
 845         free_security_data(sd);
 846 out_destroy_config:
 847         destroy_capture_config(&config);
 848         return ret;
 849 }
 850
 851 /*
 852  * Adds an image to a WIM file from a directory tree on disk.
 853  */
 854 WIMLIBAPI int wimlib_add_image(WIMStruct *w, const char *dir,
 855                                const char *name, const char *config_str,
 856                                size_t config_len, int flags)
 857 {
 858         return do_add_image(w, dir, name, config_str, config_len, flags,
 859                             build_dentry_tree, NULL);
 860 }