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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 image 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 General Public License as published by the Free
  17  * Software Foundation; either version 3 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 General Public License for more
  23  * details.
  24  *
  25  * You should have received a copy of the GNU 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 "timestamp.h"
  36 #include <sys/stat.h>
  37 #include <dirent.h>
  38 #include <string.h>
  39 #include <errno.h>
  40 #include <fnmatch.h>
  41 #include <ctype.h>
  42 #include <unistd.h>
  43
  44 /** Private flag: Used to mark that we currently adding the root directory of
  45  * the WIM image. */
  46 #define WIMLIB_ADD_IMAGE_FLAG_ROOT 0x80000000
  47
  48 void destroy_image_metadata(struct image_metadata *imd,
  49                             struct lookup_table *table)
  50 {
  51         free_dentry_tree(imd->root_dentry, table);
  52         free_security_data(imd->security_data);
  53
  54         /* Get rid of the lookup table entry for this image's metadata resource
  55          * */
  56         if (table) {
  57                 lookup_table_unlink(table, imd->metadata_lte);
  58                 free_lookup_table_entry(imd->metadata_lte);
  59         }
  60 }
  61
  62 /*
  63  * Recursively builds a dentry tree from a directory tree on disk, outside the
  64  * WIM file.
  65  *
  66  * @root_ret:   Place to return a pointer to the root of the dentry tree.  Only
  67  *              modified if successful.  NULL if the file or directory was
  68  *              excluded from capture.
  69  *
  70  * @root_disk_path:  The path to the root of the directory tree on disk.
  71  *
  72  * @lookup_table: The lookup table for the WIM file.  For each file added to the
  73  *              dentry tree being built, an entry is added to the lookup table,
  74  *              unless an identical stream is already in the lookup table.
  75  *              These lookup table entries that are added point to the path of
  76  *              the file on disk.
  77  *
  78  * @sd:         Ignored.  (Security data only captured in NTFS mode.)
  79  *
  80  * @capture_config:
  81  *              Configuration for files to be excluded from capture.
  82  *
  83  * @add_flags:  Bitwise or of WIMLIB_ADD_IMAGE_FLAG_*
  84  *
  85  * @extra_arg:  Ignored. (Only used in NTFS mode.)
  86  *
  87  * @return:     0 on success, nonzero on failure.  It is a failure if any of
  88  *              the files cannot be `stat'ed, or if any of the needed
  89  *              directories cannot be opened or read.  Failure to add the files
  90  *              to the WIM may still occur later when trying to actually read
  91  *              the on-disk files during a call to wimlib_write() or
  92  *              wimlib_overwrite().
  93  */
  94 static int build_dentry_tree(struct dentry **root_ret,
  95                              const char *root_disk_path,
  96                              struct lookup_table *lookup_table,
  97                              struct wim_security_data *sd,
  98                              const struct capture_config *config,
  99                              int add_flags,
 100                              void *extra_arg)
 101 {
 102         struct stat root_stbuf;
 103         int ret = 0;
 104         int (*stat_fn)(const char *restrict, struct stat *restrict);
 105         struct dentry *root;
 106         const char *filename;
 107         struct inode *inode;
 108
 109         if (exclude_path(root_disk_path, config, true)) {
 110                 if (add_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) {
 111                         ERROR("Cannot exclude the root directory from capture");
 112                         return WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 113                 }
 114                 if (add_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 115                         printf("Excluding file `%s' from capture\n",
 116                                root_disk_path);
 117                 *root_ret = NULL;
 118                 return 0;
 119         }
 120
 121
 122         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)
 123                 stat_fn = stat;
 124         else
 125                 stat_fn = lstat;
 126
 127         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 128                 printf("Scanning `%s'\n", root_disk_path);
 129
 130         ret = (*stat_fn)(root_disk_path, &root_stbuf);
 131         if (ret != 0) {
 132                 ERROR_WITH_ERRNO("Failed to stat `%s'", root_disk_path);
 133                 return WIMLIB_ERR_STAT;
 134         }
 135
 136         if ((add_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) &&
 137               !S_ISDIR(root_stbuf.st_mode)) {
 138                 ERROR("`%s' is not a directory", root_disk_path);
 139                 return WIMLIB_ERR_NOTDIR;
 140         }
 141         if (!S_ISREG(root_stbuf.st_mode) && !S_ISDIR(root_stbuf.st_mode)
 142             && !S_ISLNK(root_stbuf.st_mode)) {
 143                 ERROR("`%s' is not a regular file, directory, or symbolic link.",
 144                       root_disk_path);
 145                 return WIMLIB_ERR_SPECIAL_FILE;
 146         }
 147
 148         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT)
 149                 filename = "";
 150         else
 151                 filename = path_basename(root_disk_path);
 152
 153         root = new_dentry_with_timeless_inode(filename);
 154         if (!root)
 155                 return WIMLIB_ERR_NOMEM;
 156
 157         inode = root->d_inode;
 158
 159         inode->creation_time = timespec_to_wim_timestamp(&root_stbuf.st_mtim);
 160         inode->last_write_time = timespec_to_wim_timestamp(&root_stbuf.st_mtim);
 161         inode->last_access_time = timespec_to_wim_timestamp(&root_stbuf.st_atim);
 162         if (sizeof(ino_t) >= 8)
 163                 inode->ino = (u64)root_stbuf.st_ino;
 164         else
 165                 inode->ino = (u64)root_stbuf.st_ino |
 166                                    ((u64)root_stbuf.st_dev << ((sizeof(ino_t) * 8) & 63));
 167
 168         add_flags &= ~WIMLIB_ADD_IMAGE_FLAG_ROOT;
 169         inode->resolved = true;
 170
 171         if (S_ISREG(root_stbuf.st_mode)) { /* Archiving a regular file */
 172
 173                 struct lookup_table_entry *lte;
 174                 u8 hash[SHA1_HASH_SIZE];
 175
 176                 inode->attributes = FILE_ATTRIBUTE_NORMAL;
 177
 178                 /* Empty files do not have to have a lookup table entry. */
 179                 if (root_stbuf.st_size == 0)
 180                         goto out;
 181
 182                 /* For each regular file, we must check to see if the file is in
 183                  * the lookup table already; if it is, we increment its refcnt;
 184                  * otherwise, we create a new lookup table entry and insert it.
 185                  * */
 186
 187                 ret = sha1sum(root_disk_path, hash);
 188                 if (ret != 0)
 189                         goto out;
 190
 191                 lte = __lookup_resource(lookup_table, hash);
 192                 if (lte) {
 193                         lte->refcnt++;
 194                         DEBUG("Add lte reference %u for `%s'", lte->refcnt,
 195                               root_disk_path);
 196                 } else {
 197                         char *file_on_disk = STRDUP(root_disk_path);
 198                         if (!file_on_disk) {
 199                                 ERROR("Failed to allocate memory for file path");
 200                                 ret = WIMLIB_ERR_NOMEM;
 201                                 goto out;
 202                         }
 203                         lte = new_lookup_table_entry();
 204                         if (!lte) {
 205                                 FREE(file_on_disk);
 206                                 ret = WIMLIB_ERR_NOMEM;
 207                                 goto out;
 208                         }
 209                         lte->file_on_disk = file_on_disk;
 210                         lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 211                         lte->resource_entry.original_size = root_stbuf.st_size;
 212                         lte->resource_entry.size = root_stbuf.st_size;
 213                         copy_hash(lte->hash, hash);
 214                         lookup_table_insert(lookup_table, lte);
 215                 }
 216                 root->d_inode->lte = lte;
 217         } else if (S_ISDIR(root_stbuf.st_mode)) { /* Archiving a directory */
 218
 219                 inode->attributes = FILE_ATTRIBUTE_DIRECTORY;
 220
 221                 DIR *dir;
 222                 struct dirent *p;
 223                 struct dentry *child;
 224
 225                 dir = opendir(root_disk_path);
 226                 if (!dir) {
 227                         ERROR_WITH_ERRNO("Failed to open the directory `%s'",
 228                                          root_disk_path);
 229                         ret = WIMLIB_ERR_OPEN;
 230                         goto out;
 231                 }
 232
 233                 /* Buffer for names of files in directory. */
 234                 size_t len = strlen(root_disk_path);
 235                 char name[len + 1 + FILENAME_MAX + 1];
 236                 memcpy(name, root_disk_path, len);
 237                 name[len] = '/';
 238
 239                 /* Create a dentry for each entry in the directory on disk, and recurse
 240                  * to any subdirectories. */
 241                 while (1) {
 242                         errno = 0;
 243                         p = readdir(dir);
 244                         if (p == NULL) {
 245                                 if (errno) {
 246                                         ret = WIMLIB_ERR_READ;
 247                                         ERROR_WITH_ERRNO("Error reading the "
 248                                                          "directory `%s'",
 249                                                          root_disk_path);
 250                                 }
 251                                 break;
 252                         }
 253                         if (p->d_name[0] == '.' && (p->d_name[1] == '\0'
 254                               || (p->d_name[1] == '.' && p->d_name[2] == '\0')))
 255                                         continue;
 256                         strcpy(name + len + 1, p->d_name);
 257                         ret = build_dentry_tree(&child, name, lookup_table,
 258                                                 NULL, config,
 259                                                 add_flags, NULL);
 260                         if (ret != 0)
 261                                 break;
 262                         if (child)
 263                                 dentry_add_child(root, child);
 264                 }
 265                 closedir(dir);
 266         } else { /* Archiving a symbolic link */
 267                 inode->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
 268                 inode->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
 269
 270                 /* The idea here is to call readlink() to get the UNIX target of
 271                  * the symbolic link, then turn the target into a reparse point
 272                  * data buffer that contains a relative or absolute symbolic
 273                  * link (NOT a junction point or *full* path symbolic link with
 274                  * drive letter).
 275                  */
 276
 277                 char deref_name_buf[4096];
 278                 ssize_t deref_name_len;
 279
 280                 deref_name_len = readlink(root_disk_path, deref_name_buf,
 281                                           sizeof(deref_name_buf) - 1);
 282                 if (deref_name_len >= 0) {
 283                         deref_name_buf[deref_name_len] = '\0';
 284                         DEBUG("Read symlink `%s'", deref_name_buf);
 285                         ret = inode_set_symlink(root->d_inode, deref_name_buf,
 286                                                 lookup_table, NULL);
 287                         if (ret == 0) {
 288                                 /*
 289                                  * Unfortunately, Windows seems to have the
 290                                  * concept of "file" symbolic links as being
 291                                  * different from "directory" symbolic links...
 292                                  * so FILE_ATTRIBUTE_DIRECTORY needs to be set
 293                                  * on the symbolic link if the *target* of the
 294                                  * symbolic link is a directory.
 295                                  */
 296                                 struct stat stbuf;
 297                                 if (stat(root_disk_path, &stbuf) == 0 &&
 298                                     S_ISDIR(stbuf.st_mode))
 299                                 {
 300                                         inode->attributes |= FILE_ATTRIBUTE_DIRECTORY;
 301                                 }
 302                         }
 303                 } else {
 304                         ERROR_WITH_ERRNO("Failed to read target of "
 305                                          "symbolic link `%s'", root_disk_path);
 306                         ret = WIMLIB_ERR_READLINK;
 307                 }
 308         }
 309 out:
 310         if (ret == 0)
 311                 *root_ret = root;
 312         else
 313                 free_dentry_tree(root, lookup_table);
 314         return ret;
 315 }
 316
 317 struct wim_pair {
 318         WIMStruct *src_wim;
 319         WIMStruct *dest_wim;
 320         struct list_head lte_list_head;
 321 };
 322
 323 static int allocate_lte_if_needed(struct dentry *dentry, void *arg)
 324 {
 325         const WIMStruct *src_wim, *dest_wim;
 326         struct list_head *lte_list_head;
 327         struct inode *inode;
 328
 329         src_wim = ((struct wim_pair*)arg)->src_wim;
 330         dest_wim = ((struct wim_pair*)arg)->dest_wim;
 331         lte_list_head = &((struct wim_pair*)arg)->lte_list_head;
 332         inode = dentry->d_inode;
 333
 334         wimlib_assert(!inode->resolved);
 335
 336         for (unsigned i = 0; i <= inode->num_ads; i++) {
 337                 struct lookup_table_entry *src_lte, *dest_lte;
 338                 src_lte = inode_stream_lte_unresolved(inode, i,
 339                                                       src_wim->lookup_table);
 340
 341                 if (src_lte && ++src_lte->out_refcnt == 1) {
 342                         dest_lte = inode_stream_lte_unresolved(inode, i,
 343                                                                dest_wim->lookup_table);
 344
 345                         if (!dest_lte) {
 346                                 dest_lte = clone_lookup_table_entry(src_lte);
 347                                 if (!dest_lte)
 348                                         return WIMLIB_ERR_NOMEM;
 349                                 list_add_tail(&dest_lte->staging_list, lte_list_head);
 350                         }
 351                 }
 352         }
 353         return 0;
 354 }
 355
 356 /*
 357  * This function takes in a dentry that was previously located only in image(s)
 358  * in @src_wim, but now is being added to @dest_wim.  For each stream associated
 359  * with the dentry, if there is already a lookup table entry for that stream in
 360  * the lookup table of the destination WIM file, its reference count is
 361  * incrementej.  Otherwise, a new lookup table entry is created that points back
 362  * to the stream in the source WIM file (through the @hash field combined with
 363  * the @wim field of the lookup table entry.)
 364  */
 365 static int add_lte_to_dest_wim(struct dentry *dentry, void *arg)
 366 {
 367         WIMStruct *src_wim, *dest_wim;
 368         struct inode *inode;
 369
 370         src_wim = ((struct wim_pair*)arg)->src_wim;
 371         dest_wim = ((struct wim_pair*)arg)->dest_wim;
 372         inode = dentry->d_inode;
 373
 374         wimlib_assert(!inode->resolved);
 375
 376         for (unsigned i = 0; i <= inode->num_ads; i++) {
 377                 struct lookup_table_entry *src_lte, *dest_lte;
 378                 src_lte = inode_stream_lte_unresolved(inode, i,
 379                                                       src_wim->lookup_table);
 380
 381                 if (!src_lte) /* Empty or nonexistent stream. */
 382                         continue;
 383
 384                 dest_lte = inode_stream_lte_unresolved(inode, i,
 385                                                        dest_wim->lookup_table);
 386                 if (dest_lte) {
 387                         dest_lte->refcnt++;
 388                 } else {
 389                         struct list_head *lte_list_head;
 390                         struct list_head *next;
 391
 392                         lte_list_head = &((struct wim_pair*)arg)->lte_list_head;
 393                         wimlib_assert(!list_empty(lte_list_head));
 394
 395                         next = lte_list_head->next;
 396                         list_del(next);
 397                         dest_lte = container_of(next, struct lookup_table_entry,
 398                                                 staging_list);
 399                         dest_lte->part_number = 1;
 400                         dest_lte->refcnt = 1;
 401                         wimlib_assert(hashes_equal(dest_lte->hash, src_lte->hash));
 402
 403                         lookup_table_insert(dest_wim->lookup_table, dest_lte);
 404                 }
 405         }
 406         return 0;
 407 }
 408
 409 /*
 410  * Adds an image (given by its dentry tree) to the image metadata array of a WIM
 411  * file, adds an entry to the lookup table for the image metadata, updates the
 412  * image count in the header, and selects the new image.
 413  *
 414  * Does not update the XML data.
 415  *
 416  * On failure, WIMLIB_ERR_NOMEM is returned and no changes are made.  Otherwise,
 417  * 0 is returned and the image metadata array of @w is modified.
 418  *
 419  * @w:            The WIMStruct for the WIM file.
 420  * @root_dentry:  The root of the directory tree for the image.
 421  * @sd:           The security data for the image.
 422  */
 423 static int add_new_dentry_tree(WIMStruct *w, struct dentry *root_dentry,
 424                                struct wim_security_data *sd)
 425 {
 426         struct lookup_table_entry *metadata_lte;
 427         struct image_metadata *imd;
 428         struct image_metadata *new_imd;
 429         int ret;
 430
 431         wimlib_assert(root_dentry != NULL);
 432
 433         DEBUG("Reallocating image metadata array for image_count = %u",
 434               w->hdr.image_count + 1);
 435         imd = CALLOC((w->hdr.image_count + 1), sizeof(struct image_metadata));
 436
 437         if (!imd) {
 438                 ERROR("Failed to allocate memory for new image metadata array");
 439                 goto err;
 440         }
 441
 442         memcpy(imd, w->image_metadata,
 443                w->hdr.image_count * sizeof(struct image_metadata));
 444
 445         metadata_lte = new_lookup_table_entry();
 446         if (!metadata_lte)
 447                 goto err_free_imd;
 448
 449         metadata_lte->resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
 450         random_hash(metadata_lte->hash);
 451         lookup_table_insert(w->lookup_table, metadata_lte);
 452
 453         new_imd = &imd[w->hdr.image_count];
 454
 455         new_imd->root_dentry    = root_dentry;
 456         new_imd->metadata_lte   = metadata_lte;
 457         new_imd->security_data  = sd;
 458         new_imd->modified       = true;
 459
 460         FREE(w->image_metadata);
 461         w->image_metadata       = imd;
 462         w->hdr.image_count++;
 463
 464         /* Change the current image to the new one.  There should not be any
 465          * ways for this to fail, since the image is valid and the dentry tree
 466          * is already in memory. */
 467         ret = select_wim_image(w, w->hdr.image_count);
 468         wimlib_assert(ret == 0);
 469         return ret;
 470 err_free_imd:
 471         FREE(imd);
 472 err:
 473         return WIMLIB_ERR_NOMEM;
 474
 475 }
 476
 477 /*
 478  * Copies an image, or all the images, from a WIM file, into another WIM file.
 479  */
 480 WIMLIBAPI int wimlib_export_image(WIMStruct *src_wim,
 481                                   int src_image,
 482                                   WIMStruct *dest_wim,
 483                                   const char *dest_name,
 484                                   const char *dest_description,
 485                                   int flags,
 486                                   WIMStruct **additional_swms,
 487                                   unsigned num_additional_swms)
 488 {
 489         int i;
 490         int ret;
 491         struct dentry *root;
 492         struct wim_pair wims;
 493         struct wim_security_data *sd;
 494         struct lookup_table *joined_tab, *src_wim_tab_save;
 495
 496         if (!src_wim || !dest_wim)
 497                 return WIMLIB_ERR_INVALID_PARAM;
 498
 499         if (dest_wim->hdr.total_parts != 1) {
 500                 ERROR("Exporting an image to a split WIM is "
 501                       "unsupported");
 502                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 503         }
 504
 505         if (src_image == WIM_ALL_IMAGES) {
 506                 if (src_wim->hdr.image_count > 1) {
 507
 508                         /* multi-image export. */
 509
 510                         if ((flags & WIMLIB_EXPORT_FLAG_BOOT) &&
 511                               (src_wim->hdr.boot_idx == 0))
 512                         {
 513                                 /* Specifying the boot flag on a multi-image
 514                                  * source WIM makes the boot index default to
 515                                  * the bootable image in the source WIM.  It is
 516                                  * an error if there is no such bootable image.
 517                                  * */
 518                                 ERROR("Cannot specify `boot' flag when "
 519                                       "exporting multiple images from a WIM "
 520                                       "with no bootable images");
 521                                 return WIMLIB_ERR_INVALID_PARAM;
 522                         }
 523                         if (dest_name || dest_description) {
 524                                 ERROR("Image name or image description was "
 525                                       "specified, but we are exporting "
 526                                       "multiple images");
 527                                 return WIMLIB_ERR_INVALID_PARAM;
 528                         }
 529                         for (i = 1; i <= src_wim->hdr.image_count; i++) {
 530                                 int export_flags = flags;
 531
 532                                 if (i != src_wim->hdr.boot_idx)
 533                                         export_flags &= ~WIMLIB_EXPORT_FLAG_BOOT;
 534
 535                                 ret = wimlib_export_image(src_wim, i, dest_wim,
 536                                                           NULL, NULL,
 537                                                           export_flags,
 538                                                           additional_swms,
 539                                                           num_additional_swms);
 540                                 if (ret != 0)
 541                                         return ret;
 542                         }
 543                         return 0;
 544                 } else if (src_wim->hdr.image_count == 1) {
 545                         src_image = 1;
 546                 } else {
 547                         return 0;
 548                 }
 549         }
 550
 551         if (!dest_name) {
 552                 dest_name = wimlib_get_image_name(src_wim, src_image);
 553                 DEBUG("Using name `%s' for source image %d",
 554                       dest_name, src_image);
 555         }
 556
 557         if (!dest_description) {
 558                 dest_description = wimlib_get_image_description(src_wim,
 559                                                                 src_image);
 560                 DEBUG("Using description `%s' for source image %d",
 561                       dest_description, src_image);
 562         }
 563
 564         DEBUG("Exporting image %d from `%s'", src_image, src_wim->filename);
 565
 566         if (wimlib_image_name_in_use(dest_wim, dest_name)) {
 567                 ERROR("There is already an image named `%s' in the "
 568                       "destination WIM", dest_name);
 569                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 570         }
 571
 572         ret = verify_swm_set(src_wim, additional_swms, num_additional_swms);
 573         if (ret != 0)
 574                 return ret;
 575
 576         if (num_additional_swms) {
 577                 ret = new_joined_lookup_table(src_wim, additional_swms,
 578                                               num_additional_swms,
 579                                               &joined_tab);
 580                 if (ret != 0)
 581                         return ret;
 582                 src_wim_tab_save = src_wim->lookup_table;
 583                 src_wim->lookup_table = joined_tab;
 584         }
 585
 586         ret = select_wim_image(src_wim, src_image);
 587         if (ret != 0) {
 588                 ERROR("Could not select image %d from the WIM `%s' "
 589                       "to export it", src_image, src_wim->filename);
 590                 goto out;
 591         }
 592
 593         /* Pre-allocate the new lookup table entries that will be needed.  This
 594          * way, it's not possible to run out of memory part-way through
 595          * modifying the lookup table of the destination WIM. */
 596         wims.src_wim = src_wim;
 597         wims.dest_wim = dest_wim;
 598         INIT_LIST_HEAD(&wims.lte_list_head);
 599         for_lookup_table_entry(src_wim->lookup_table, lte_zero_out_refcnt, NULL);
 600         root = wim_root_dentry(src_wim);
 601         for_dentry_in_tree(root, dentry_unresolve_ltes, NULL);
 602         ret = for_dentry_in_tree(root, allocate_lte_if_needed, &wims);
 603         if (ret != 0)
 604                 goto out_free_ltes;
 605
 606         ret = xml_export_image(src_wim->wim_info, src_image,
 607                                &dest_wim->wim_info, dest_name, dest_description);
 608         if (ret != 0)
 609                 goto out_free_ltes;
 610
 611         sd = wim_security_data(src_wim);
 612         ret = add_new_dentry_tree(dest_wim, root, sd);
 613         if (ret != 0)
 614                 goto out_xml_delete_image;
 615
 616
 617         /* All memory allocations have been taken care of, so it's no longer
 618          * possible for this function to fail.  Go ahead and increment the
 619          * reference counts of the dentry tree and security data, then update
 620          * the lookup table of the destination WIM and the boot index, if
 621          * needed. */
 622         for_dentry_in_tree(root, increment_dentry_refcnt, NULL);
 623         sd->refcnt++;
 624         for_dentry_in_tree(root, add_lte_to_dest_wim, &wims);
 625         wimlib_assert(list_empty(&wims.lte_list_head));
 626
 627         if (flags & WIMLIB_EXPORT_FLAG_BOOT) {
 628                 DEBUG("Setting boot_idx to %d", dest_wim->hdr.image_count);
 629                 dest_wim->hdr.boot_idx = dest_wim->hdr.image_count;
 630         }
 631         ret = 0;
 632         goto out;
 633
 634 out_xml_delete_image:
 635         xml_delete_image(&dest_wim->wim_info, dest_wim->hdr.image_count);
 636 out_free_ltes:
 637         {
 638                 struct lookup_table_entry *lte, *tmp;
 639                 list_for_each_entry_safe(lte, tmp, &wims.lte_list_head, staging_list)
 640                         free_lookup_table_entry(lte);
 641         }
 642
 643 out:
 644         if (num_additional_swms) {
 645                 free_lookup_table(src_wim->lookup_table);
 646                 src_wim->lookup_table = src_wim_tab_save;
 647         }
 648         return ret;
 649 }
 650
 651 /*
 652  * Deletes an image from the WIM.
 653  */
 654 WIMLIBAPI int wimlib_delete_image(WIMStruct *w, int image)
 655 {
 656         int i;
 657         int ret;
 658
 659         if (w->hdr.total_parts != 1) {
 660                 ERROR("Deleting an image from a split WIM is not supported.");
 661                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 662         }
 663
 664         if (image == WIM_ALL_IMAGES) {
 665                 for (i = w->hdr.image_count; i >= 1; i--) {
 666                         ret = wimlib_delete_image(w, i);
 667                         if (ret != 0)
 668                                 return ret;
 669                 }
 670                 return 0;
 671         }
 672
 673         DEBUG("Deleting image %d", image);
 674
 675         /* Even if the dentry tree is not allocated, we must select it (and
 676          * therefore allocate it) so that we can decrement the reference counts
 677          * in the lookup table.  */
 678         ret = select_wim_image(w, image);
 679         if (ret != 0)
 680                 return ret;
 681
 682         /* Free the dentry tree, any lookup table entries that have their
 683          * refcnt decremented to 0, and the security data. */
 684         destroy_image_metadata(&w->image_metadata[image - 1], w->lookup_table);
 685
 686         /* Get rid of the empty slot in the image metadata array. */
 687         memmove(&w->image_metadata[image - 1], &w->image_metadata[image],
 688                 (w->hdr.image_count - image) * sizeof(struct image_metadata));
 689
 690         /* Decrement the image count. */
 691         if (--w->hdr.image_count == 0) {
 692                 FREE(w->image_metadata);
 693                 w->image_metadata = NULL;
 694         }
 695
 696         /* Fix the boot index. */
 697         if (w->hdr.boot_idx == image)
 698                 w->hdr.boot_idx = 0;
 699         else if (w->hdr.boot_idx > image)
 700                 w->hdr.boot_idx--;
 701
 702         w->current_image = WIM_NO_IMAGE;
 703
 704         /* Remove the image from the XML information. */
 705         xml_delete_image(&w->wim_info, image);
 706
 707         w->deletion_occurred = true;
 708         return 0;
 709 }
 710
 711 enum pattern_type {
 712         NONE = 0,
 713         EXCLUSION_LIST,
 714         EXCLUSION_EXCEPTION,
 715         COMPRESSION_EXCLUSION_LIST,
 716         ALIGNMENT_LIST,
 717 };
 718
 719 /* Default capture configuration file when none is specified. */
 720 static const char *default_config =
 721 "[ExclusionList]\n"
 722 "\\$ntfs.log\n"
 723 "\\hiberfil.sys\n"
 724 "\\pagefile.sys\n"
 725 "\\System Volume Information\n"
 726 "\\RECYCLER\n"
 727 "\\Windows\\CSC\n"
 728 "\n"
 729 "[CompressionExclusionList]\n"
 730 "*.mp3\n"
 731 "*.zip\n"
 732 "*.cab\n"
 733 "\\WINDOWS\\inf\\*.pnf\n";
 734
 735 static void destroy_pattern_list(struct pattern_list *list)
 736 {
 737         FREE(list->pats);
 738 }
 739
 740 static void destroy_capture_config(struct capture_config *config)
 741 {
 742         destroy_pattern_list(&config->exclusion_list);
 743         destroy_pattern_list(&config->exclusion_exception);
 744         destroy_pattern_list(&config->compression_exclusion_list);
 745         destroy_pattern_list(&config->alignment_list);
 746         FREE(config->config_str);
 747         FREE(config->prefix);
 748         memset(config, 0, sizeof(*config));
 749 }
 750
 751 static int pattern_list_add_pattern(struct pattern_list *list,
 752                                     const char *pattern)
 753 {
 754         const char **pats;
 755         if (list->num_pats >= list->num_allocated_pats) {
 756                 pats = REALLOC(list->pats,
 757                                sizeof(list->pats[0]) * (list->num_allocated_pats + 8));
 758                 if (!pats)
 759                         return WIMLIB_ERR_NOMEM;
 760                 list->num_allocated_pats += 8;
 761                 list->pats = pats;
 762         }
 763         list->pats[list->num_pats++] = pattern;
 764         return 0;
 765 }
 766
 767 /* Parses the contents of the image capture configuration file and fills in a
 768  * `struct capture_config'. */
 769 static int init_capture_config(const char *_config_str, size_t config_len,
 770                                const char *_prefix, struct capture_config *config)
 771 {
 772         char *config_str;
 773         char *prefix;
 774         char *p;
 775         char *eol;
 776         char *next_p;
 777         size_t bytes_remaining;
 778         enum pattern_type type = NONE;
 779         int ret;
 780         unsigned long line_no = 0;
 781
 782         DEBUG("config_len = %zu", config_len);
 783         bytes_remaining = config_len;
 784         memset(config, 0, sizeof(*config));
 785         config_str = MALLOC(config_len);
 786         if (!config_str) {
 787                 ERROR("Could not duplicate capture config string");
 788                 return WIMLIB_ERR_NOMEM;
 789         }
 790         prefix = STRDUP(_prefix);
 791         if (!prefix) {
 792                 FREE(config_str);
 793                 return WIMLIB_ERR_NOMEM;
 794         }
 795
 796         memcpy(config_str, _config_str, config_len);
 797         next_p = config_str;
 798         config->config_str = config_str;
 799         config->prefix = prefix;
 800         config->prefix_len = strlen(prefix);
 801         while (bytes_remaining) {
 802                 line_no++;
 803                 p = next_p;
 804                 eol = memchr(p, '\n', bytes_remaining);
 805                 if (!eol) {
 806                         ERROR("Expected end-of-line in capture config file on "
 807                               "line %lu", line_no);
 808                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 809                         goto out_destroy;
 810                 }
 811
 812                 next_p = eol + 1;
 813                 bytes_remaining -= (next_p - p);
 814                 if (eol == p)
 815                         continue;
 816
 817                 if (*(eol - 1) == '\r')
 818                         eol--;
 819                 *eol = '\0';
 820
 821                 /* Translate backslash to forward slash */
 822                 for (char *pp = p; pp != eol; pp++)
 823                         if (*pp == '\\')
 824                                 *pp = '/';
 825
 826                 /* Remove drive letter */
 827                 if (eol - p > 2 && isalpha(*p) && *(p + 1) == ':')
 828                         p += 2;
 829
 830                 ret = 0;
 831                 if (strcmp(p, "[ExclusionList]") == 0)
 832                         type = EXCLUSION_LIST;
 833                 else if (strcmp(p, "[ExclusionException]") == 0)
 834                         type = EXCLUSION_EXCEPTION;
 835                 else if (strcmp(p, "[CompressionExclusionList]") == 0)
 836                         type = COMPRESSION_EXCLUSION_LIST;
 837                 else if (strcmp(p, "[AlignmentList]") == 0)
 838                         type = ALIGNMENT_LIST;
 839                 else if (p[0] == '[' && strrchr(p, ']')) {
 840                         ERROR("Unknown capture configuration section `%s'", p);
 841                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 842                 } else switch (type) {
 843                 case EXCLUSION_LIST:
 844                         DEBUG("Adding pattern \"%s\" to exclusion list", p);
 845                         ret = pattern_list_add_pattern(&config->exclusion_list, p);
 846                         break;
 847                 case EXCLUSION_EXCEPTION:
 848                         DEBUG("Adding pattern \"%s\" to exclusion exception list", p);
 849                         ret = pattern_list_add_pattern(&config->exclusion_exception, p);
 850                         break;
 851                 case COMPRESSION_EXCLUSION_LIST:
 852                         DEBUG("Adding pattern \"%s\" to compression exclusion list", p);
 853                         ret = pattern_list_add_pattern(&config->compression_exclusion_list, p);
 854                         break;
 855                 case ALIGNMENT_LIST:
 856                         DEBUG("Adding pattern \"%s\" to alignment list", p);
 857                         ret = pattern_list_add_pattern(&config->alignment_list, p);
 858                         break;
 859                 default:
 860                         ERROR("Line %lu of capture configuration is not "
 861                               "in a block (such as [ExclusionList])",
 862                               line_no);
 863                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 864                         break;
 865                 }
 866                 if (ret != 0)
 867                         goto out_destroy;
 868         }
 869         return 0;
 870 out_destroy:
 871         destroy_capture_config(config);
 872         return ret;
 873 }
 874
 875 static bool match_pattern(const char *path, const char *path_basename,
 876                           const struct pattern_list *list)
 877 {
 878         for (size_t i = 0; i < list->num_pats; i++) {
 879                 const char *pat = list->pats[i];
 880                 const char *string;
 881                 if (pat[0] == '/')
 882                         /* Absolute path from root of capture */
 883                         string = path;
 884                 else {
 885                         if (strchr(pat, '/'))
 886                                 /* Relative path from root of capture */
 887                                 string = path + 1;
 888                         else
 889                                 /* A file name pattern */
 890                                 string = path_basename;
 891                 }
 892                 if (fnmatch(pat, string, FNM_PATHNAME
 893                         #ifdef FNM_CASEFOLD
 894                                         | FNM_CASEFOLD
 895                         #endif
 896                         ) == 0)
 897                 {
 898                         DEBUG("`%s' matches the pattern \"%s\"",
 899                               string, pat);
 900                         return true;
 901                 }
 902         }
 903         return false;
 904 }
 905
 906 static void print_pattern_list(const struct pattern_list *list)
 907 {
 908         for (size_t i = 0; i < list->num_pats; i++)
 909                 printf("    %s\n", list->pats[i]);
 910 }
 911
 912 static void print_capture_config(const struct capture_config *config)
 913 {
 914         if (config->exclusion_list.num_pats) {
 915                 puts("Files or folders excluded from image capture:");
 916                 print_pattern_list(&config->exclusion_list);
 917                 putchar('\n');
 918         }
 919 }
 920
 921 /* Return true if the image capture configuration file indicates we should
 922  * exclude the filename @path from capture.
 923  *
 924  * If @exclude_prefix is %true, the part of the path up and including the name
 925  * of the directory being captured is not included in the path for matching
 926  * purposes.  This allows, for example, a pattern like /hiberfil.sys to match a
 927  * file /mnt/windows7/hiberfil.sys if we are capturing the /mnt/windows7
 928  * directory.
 929  */
 930 bool exclude_path(const char *path, const struct capture_config *config,
 931                   bool exclude_prefix)
 932 {
 933         const char *basename = path_basename(path);
 934         if (exclude_prefix) {
 935                 wimlib_assert(strlen(path) >= config->prefix_len);
 936                 if (memcmp(config->prefix, path, config->prefix_len) == 0
 937                      && path[config->prefix_len] == '/')
 938                         path += config->prefix_len;
 939         }
 940         return match_pattern(path, basename, &config->exclusion_list) &&
 941                 !match_pattern(path, basename, &config->exclusion_exception);
 942
 943 }
 944
 945
 946
 947 /*
 948  * Adds an image to the WIM, delegating the capture of the dentry tree and
 949  * security data to the function @capture_tree passed as a parameter.
 950  * Currently, @capture_tree may be build_dentry_tree() for capturing a "regular"
 951  * directory tree on disk, or build_dentry_tree_ntfs() for capturing a WIM image
 952  * directory from a NTFS volume using libntfs-3g.
 953  *
 954  * The @capture_tree function is also expected to create lookup table entries
 955  * for all the file streams it captures and insert them into @lookup_table,
 956  * being careful to look for identical entries that already exist and simply
 957  * increment the reference count for them rather than duplicating the entry.
 958  */
 959 int do_add_image(WIMStruct *w, const char *dir, const char *name,
 960                  const char *config_str, size_t config_len,
 961                  int flags,
 962                  int (*capture_tree)(struct dentry **, const char *,
 963                                      struct lookup_table *,
 964                                      struct wim_security_data *,
 965                                      const struct capture_config *,
 966                                      int, void *),
 967                  void *extra_arg)
 968 {
 969         struct dentry *root_dentry = NULL;
 970         struct wim_security_data *sd;
 971         struct capture_config config;
 972         struct inode_table inode_tab;
 973         struct hlist_head inode_list;
 974         int ret;
 975
 976         DEBUG("Adding dentry tree from directory or NTFS volume `%s'.", dir);
 977
 978         if (!name || !*name) {
 979                 ERROR("Must specify a non-empty string for the image name");
 980                 return WIMLIB_ERR_INVALID_PARAM;
 981         }
 982         if (!dir) {
 983                 ERROR("Must specify the name of a directory or NTFS volume");
 984                 return WIMLIB_ERR_INVALID_PARAM;
 985         }
 986
 987         if (w->hdr.total_parts != 1) {
 988                 ERROR("Cannot add an image to a split WIM");
 989                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 990         }
 991
 992         if (wimlib_image_name_in_use(w, name)) {
 993                 ERROR("There is already an image named \"%s\" in `%s'",
 994                       name, w->filename);
 995                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 996         }
 997
 998         DEBUG("Initializing capture configuration");
 999         if (!config_str) {
1000                 DEBUG("Using default capture configuration");
1001                 config_str = default_config;
1002                 config_len = strlen(default_config);
1003         }
1004         ret = init_capture_config(config_str, config_len, dir, &config);
1005         if (ret != 0)
1006                 return ret;
1007         print_capture_config(&config);
1008
1009         DEBUG("Allocating security data");
1010
1011         sd = CALLOC(1, sizeof(struct wim_security_data));
1012         if (!sd) {
1013                 ret = WIMLIB_ERR_NOMEM;
1014                 goto out_destroy_config;
1015         }
1016         sd->total_length = 8;
1017         sd->refcnt = 1;
1018
1019         DEBUG("Building dentry tree.");
1020         if (flags & WIMLIB_ADD_IMAGE_FLAG_SHOW_PROGRESS) {
1021                 printf("Scanning `%s'...\n", dir);
1022         }
1023         ret = (*capture_tree)(&root_dentry, dir, w->lookup_table, sd,
1024                               &config, flags | WIMLIB_ADD_IMAGE_FLAG_ROOT,
1025                               extra_arg);
1026         destroy_capture_config(&config);
1027
1028         if (ret != 0) {
1029                 ERROR("Failed to build dentry tree for `%s'", dir);
1030                 goto out_free_security_data;
1031         }
1032
1033         DEBUG("Calculating full paths of dentries.");
1034         ret = for_dentry_in_tree(root_dentry, calculate_dentry_full_path, NULL);
1035         if (ret != 0)
1036                 goto out_free_dentry_tree;
1037
1038         ret = add_new_dentry_tree(w, root_dentry, sd);
1039         if (ret != 0)
1040                 goto out_free_dentry_tree;
1041
1042         DEBUG("Inserting dentries into inode table");
1043         ret = init_inode_table(&inode_tab, 9001);
1044         if (ret != 0)
1045                 goto out_destroy_imd;
1046
1047         for_dentry_in_tree(root_dentry, inode_table_insert, &inode_tab);
1048
1049         DEBUG("Cleaning up the hard link groups");
1050         ret = fix_inodes(&inode_tab, &inode_list);
1051         destroy_inode_table(&inode_tab);
1052         if (ret != 0)
1053                 goto out_destroy_imd;
1054
1055         DEBUG("Assigning hard link group IDs");
1056         assign_inode_numbers(&inode_list);
1057
1058         ret = xml_add_image(w, name);
1059         if (ret != 0)
1060                 goto out_destroy_imd;
1061
1062         if (flags & WIMLIB_ADD_IMAGE_FLAG_BOOT)
1063                 w->hdr.boot_idx = w->hdr.image_count;
1064
1065         return 0;
1066 out_destroy_imd:
1067         destroy_image_metadata(&w->image_metadata[w->hdr.image_count - 1],
1068                                w->lookup_table);
1069         w->hdr.image_count--;
1070         return ret;
1071 out_free_dentry_tree:
1072         free_dentry_tree(root_dentry, w->lookup_table);
1073 out_free_security_data:
1074         free_security_data(sd);
1075 out_destroy_config:
1076         destroy_capture_config(&config);
1077         return ret;
1078 }
1079
1080 /*
1081  * Adds an image to a WIM file from a directory tree on disk.
1082  */
1083 WIMLIBAPI int wimlib_add_image(WIMStruct *w, const char *dir,
1084                                const char *name, const char *config_str,
1085                                size_t config_len, int flags)
1086 {
1087         return do_add_image(w, dir, name, config_str, config_len, flags,
1088                             build_dentry_tree, NULL);
1089 }