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

   1 /*
   2  * add_image.c
   3  */
   4
   5 /*
   6  * Copyright (C) 2012 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #include "wimlib_internal.h"
  25 #include "dentry.h"
  26 #include "timestamp.h"
  27 #include "lookup_table.h"
  28 #include "xml.h"
  29 #include <string.h>
  30 #include <fnmatch.h>
  31 #include <ctype.h>
  32 #include <sys/stat.h>
  33 #include <dirent.h>
  34 #include <errno.h>
  35 #include <unistd.h>
  36
  37 /** Private flag: Used to mark that we currently adding the root directory of
  38  * the WIM image. */
  39 #define WIMLIB_ADD_IMAGE_FLAG_ROOT 0x80000000
  40
  41 /*
  42  * Adds the dentry tree and security data for a new image to the image metadata
  43  * array of the WIMStruct.
  44  */
  45 int add_new_dentry_tree(WIMStruct *w, struct wim_dentry *root_dentry,
  46                         struct wim_security_data *sd)
  47 {
  48         struct wim_lookup_table_entry *metadata_lte;
  49         struct wim_image_metadata *imd;
  50         struct wim_image_metadata *new_imd;
  51
  52         wimlib_assert(root_dentry != NULL);
  53
  54         DEBUG("Reallocating image metadata array for image_count = %u",
  55               w->hdr.image_count + 1);
  56         imd = CALLOC((w->hdr.image_count + 1), sizeof(struct wim_image_metadata));
  57
  58         if (!imd) {
  59                 ERROR("Failed to allocate memory for new image metadata array");
  60                 goto err;
  61         }
  62
  63         memcpy(imd, w->image_metadata,
  64                w->hdr.image_count * sizeof(struct wim_image_metadata));
  65
  66         metadata_lte = new_lookup_table_entry();
  67         if (!metadata_lte)
  68                 goto err_free_imd;
  69
  70         metadata_lte->resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
  71         random_hash(metadata_lte->hash);
  72         lookup_table_insert(w->lookup_table, metadata_lte);
  73
  74         new_imd = &imd[w->hdr.image_count];
  75
  76         new_imd->root_dentry    = root_dentry;
  77         new_imd->metadata_lte   = metadata_lte;
  78         new_imd->security_data  = sd;
  79         new_imd->modified       = 1;
  80
  81         FREE(w->image_metadata);
  82         w->image_metadata = imd;
  83         w->hdr.image_count++;
  84         return 0;
  85 err_free_imd:
  86         FREE(imd);
  87 err:
  88         return WIMLIB_ERR_NOMEM;
  89
  90 }
  91
  92
  93 /*
  94  * build_dentry_tree():
  95  *      Recursively builds a tree of WIM dentries from an on-disk directory
  96  *      tree.
  97  *
  98  * @root_ret:   Place to return a pointer to the root of the dentry tree.  Only
  99  *              modified if successful.  Set to NULL if the file or directory was
 100  *              excluded from capture.
 101  *
 102  * @root_disk_path:  The path to the root of the directory tree on disk.
 103  *
 104  * @lookup_table: The lookup table for the WIM file.  For each file added to the
 105  *              dentry tree being built, an entry is added to the lookup table,
 106  *              unless an identical stream is already in the lookup table.
 107  *              These lookup table entries that are added point to the path of
 108  *              the file on disk.
 109  *
 110  * @sd:         Ignored.  (Security data only captured in NTFS mode.)
 111  *
 112  * @capture_config:
 113  *              Configuration for files to be excluded from capture.
 114  *
 115  * @add_flags:  Bitwise or of WIMLIB_ADD_IMAGE_FLAG_*
 116  *
 117  * @extra_arg:  Ignored. (Only used in NTFS mode.)
 118  *
 119  * @return:     0 on success, nonzero on failure.  It is a failure if any of
 120  *              the files cannot be `stat'ed, or if any of the needed
 121  *              directories cannot be opened or read.  Failure to add the files
 122  *              to the WIM may still occur later when trying to actually read
 123  *              the on-disk files during a call to wimlib_write() or
 124  *              wimlib_overwrite().
 125  */
 126 static int build_dentry_tree(struct wim_dentry **root_ret,
 127                              const char *root_disk_path,
 128                              struct wim_lookup_table *lookup_table,
 129                              struct wim_security_data *sd,
 130                              const struct capture_config *config,
 131                              int add_image_flags,
 132                              wimlib_progress_func_t progress_func,
 133                              void *extra_arg)
 134 {
 135         struct stat root_stbuf;
 136         int ret = 0;
 137         int (*stat_fn)(const char *restrict, struct stat *restrict);
 138         struct wim_dentry *root;
 139         const char *filename;
 140         struct wim_inode *inode;
 141
 142         if (exclude_path(root_disk_path, config, true)) {
 143                 if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) {
 144                         ERROR("Cannot exclude the root directory from capture");
 145                         return WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 146                 }
 147                 if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 148                     && progress_func)
 149                 {
 150                         union wimlib_progress_info info;
 151                         info.scan.cur_path = root_disk_path;
 152                         info.scan.excluded = true;
 153                         progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 154                 }
 155                 *root_ret = NULL;
 156                 return 0;
 157         }
 158
 159         if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 160             && progress_func)
 161         {
 162                 union wimlib_progress_info info;
 163                 info.scan.cur_path = root_disk_path;
 164                 info.scan.excluded = false;
 165                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 166         }
 167
 168         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)
 169                 stat_fn = stat;
 170         else
 171                 stat_fn = lstat;
 172
 173         ret = (*stat_fn)(root_disk_path, &root_stbuf);
 174         if (ret != 0) {
 175                 ERROR_WITH_ERRNO("Failed to stat `%s'", root_disk_path);
 176                 return WIMLIB_ERR_STAT;
 177         }
 178
 179         if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) &&
 180               !S_ISDIR(root_stbuf.st_mode))
 181         {
 182                 /* Do a dereference-stat in case the root is a symbolic link.
 183                  * This case is allowed, provided that the symbolic link points
 184                  * to a directory. */
 185                 ret = stat(root_disk_path, &root_stbuf);
 186                 if (ret != 0) {
 187                         ERROR_WITH_ERRNO("Failed to stat `%s'", root_disk_path);
 188                         return WIMLIB_ERR_STAT;
 189                 }
 190                 if (!S_ISDIR(root_stbuf.st_mode)) {
 191                         ERROR("`%s' is not a directory", root_disk_path);
 192                         return WIMLIB_ERR_NOTDIR;
 193                 }
 194         }
 195         if (!S_ISREG(root_stbuf.st_mode) && !S_ISDIR(root_stbuf.st_mode)
 196             && !S_ISLNK(root_stbuf.st_mode)) {
 197                 ERROR("`%s' is not a regular file, directory, or symbolic link.",
 198                       root_disk_path);
 199                 return WIMLIB_ERR_SPECIAL_FILE;
 200         }
 201
 202         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT)
 203                 filename = "";
 204         else
 205                 filename = path_basename(root_disk_path);
 206
 207         root = new_dentry_with_timeless_inode(filename);
 208         if (!root) {
 209                 if (errno == EILSEQ)
 210                         return WIMLIB_ERR_INVALID_UTF8_STRING;
 211                 else if (errno == ENOMEM)
 212                         return WIMLIB_ERR_NOMEM;
 213                 else
 214                         return WIMLIB_ERR_ICONV_NOT_AVAILABLE;
 215         }
 216
 217         inode = root->d_inode;
 218
 219 #ifdef HAVE_STAT_NANOSECOND_PRECISION
 220         inode->i_creation_time = timespec_to_wim_timestamp(&root_stbuf.st_mtim);
 221         inode->i_last_write_time = timespec_to_wim_timestamp(&root_stbuf.st_mtim);
 222         inode->i_last_access_time = timespec_to_wim_timestamp(&root_stbuf.st_atim);
 223 #else
 224         inode->i_creation_time = unix_timestamp_to_wim(root_stbuf.st_mtime);
 225         inode->i_last_write_time = unix_timestamp_to_wim(root_stbuf.st_mtime);
 226         inode->i_last_access_time = unix_timestamp_to_wim(root_stbuf.st_atime);
 227 #endif
 228         if (sizeof(ino_t) >= 8)
 229                 inode->i_ino = (u64)root_stbuf.st_ino;
 230         else
 231                 inode->i_ino = (u64)root_stbuf.st_ino |
 232                                    ((u64)root_stbuf.st_dev << ((sizeof(ino_t) * 8) & 63));
 233         inode->i_resolved = 1;
 234         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) {
 235                 ret = inode_set_unix_data(inode, root_stbuf.st_uid,
 236                                           root_stbuf.st_gid,
 237                                           root_stbuf.st_mode,
 238                                           lookup_table,
 239                                           UNIX_DATA_ALL | UNIX_DATA_CREATE);
 240                 if (ret)
 241                         goto out;
 242         }
 243         add_image_flags &= ~WIMLIB_ADD_IMAGE_FLAG_ROOT;
 244         if (S_ISREG(root_stbuf.st_mode)) { /* Archiving a regular file */
 245
 246                 struct wim_lookup_table_entry *lte;
 247                 u8 hash[SHA1_HASH_SIZE];
 248
 249                 inode->i_attributes = FILE_ATTRIBUTE_NORMAL;
 250
 251                 /* Empty files do not have to have a lookup table entry. */
 252                 if (root_stbuf.st_size == 0)
 253                         goto out;
 254
 255                 /* For each regular file, we must check to see if the file is in
 256                  * the lookup table already; if it is, we increment its refcnt;
 257                  * otherwise, we create a new lookup table entry and insert it.
 258                  * */
 259
 260                 ret = sha1sum(root_disk_path, hash);
 261                 if (ret != 0)
 262                         goto out;
 263
 264                 lte = __lookup_resource(lookup_table, hash);
 265                 if (lte) {
 266                         lte->refcnt++;
 267                         DEBUG("Add lte reference %u for `%s'", lte->refcnt,
 268                               root_disk_path);
 269                 } else {
 270                         char *file_on_disk = STRDUP(root_disk_path);
 271                         if (!file_on_disk) {
 272                                 ERROR("Failed to allocate memory for file path");
 273                                 ret = WIMLIB_ERR_NOMEM;
 274                                 goto out;
 275                         }
 276                         lte = new_lookup_table_entry();
 277                         if (!lte) {
 278                                 FREE(file_on_disk);
 279                                 ret = WIMLIB_ERR_NOMEM;
 280                                 goto out;
 281                         }
 282                         lte->file_on_disk = file_on_disk;
 283                         lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 284                         lte->resource_entry.original_size = root_stbuf.st_size;
 285                         lte->resource_entry.size = root_stbuf.st_size;
 286                         copy_hash(lte->hash, hash);
 287                         lookup_table_insert(lookup_table, lte);
 288                 }
 289                 root->d_inode->i_lte = lte;
 290         } else if (S_ISDIR(root_stbuf.st_mode)) { /* Archiving a directory */
 291
 292                 inode->i_attributes = FILE_ATTRIBUTE_DIRECTORY;
 293
 294                 DIR *dir;
 295                 struct dirent entry, *result;
 296                 struct wim_dentry *child;
 297
 298                 dir = opendir(root_disk_path);
 299                 if (!dir) {
 300                         ERROR_WITH_ERRNO("Failed to open the directory `%s'",
 301                                          root_disk_path);
 302                         ret = WIMLIB_ERR_OPEN;
 303                         goto out;
 304                 }
 305
 306                 /* Buffer for names of files in directory. */
 307                 size_t len = strlen(root_disk_path);
 308                 char name[len + 1 + FILENAME_MAX + 1];
 309                 memcpy(name, root_disk_path, len);
 310                 name[len] = '/';
 311
 312                 /* Create a dentry for each entry in the directory on disk, and recurse
 313                  * to any subdirectories. */
 314                 while (1) {
 315                         errno = 0;
 316                         ret = readdir_r(dir, &entry, &result);
 317                         if (ret != 0) {
 318                                 ret = WIMLIB_ERR_READ;
 319                                 ERROR_WITH_ERRNO("Error reading the "
 320                                                  "directory `%s'",
 321                                                  root_disk_path);
 322                                 break;
 323                         }
 324                         if (result == NULL)
 325                                 break;
 326                         if (result->d_name[0] == '.' && (result->d_name[1] == '\0'
 327                               || (result->d_name[1] == '.' && result->d_name[2] == '\0')))
 328                                         continue;
 329                         strcpy(name + len + 1, result->d_name);
 330                         ret = build_dentry_tree(&child, name, lookup_table,
 331                                                 NULL, config, add_image_flags,
 332                                                 progress_func, NULL);
 333                         if (ret != 0)
 334                                 break;
 335                         if (child)
 336                                 dentry_add_child(root, child);
 337                 }
 338                 closedir(dir);
 339         } else { /* Archiving a symbolic link */
 340                 inode->i_attributes = FILE_ATTRIBUTE_REPARSE_POINT;
 341                 inode->i_reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
 342
 343                 /* The idea here is to call readlink() to get the UNIX target of
 344                  * the symbolic link, then turn the target into a reparse point
 345                  * data buffer that contains a relative or absolute symbolic
 346                  * link (NOT a junction point or *full* path symbolic link with
 347                  * drive letter).
 348                  */
 349
 350                 char deref_name_buf[4096];
 351                 ssize_t deref_name_len;
 352
 353                 deref_name_len = readlink(root_disk_path, deref_name_buf,
 354                                           sizeof(deref_name_buf) - 1);
 355                 if (deref_name_len >= 0) {
 356                         deref_name_buf[deref_name_len] = '\0';
 357                         DEBUG("Read symlink `%s'", deref_name_buf);
 358                         ret = inode_set_symlink(root->d_inode, deref_name_buf,
 359                                                 lookup_table, NULL);
 360                         if (ret == 0) {
 361                                 /*
 362                                  * Unfortunately, Windows seems to have the
 363                                  * concept of "file" symbolic links as being
 364                                  * different from "directory" symbolic links...
 365                                  * so FILE_ATTRIBUTE_DIRECTORY needs to be set
 366                                  * on the symbolic link if the *target* of the
 367                                  * symbolic link is a directory.
 368                                  */
 369                                 struct stat stbuf;
 370                                 if (stat(root_disk_path, &stbuf) == 0 &&
 371                                     S_ISDIR(stbuf.st_mode))
 372                                 {
 373                                         inode->i_attributes |= FILE_ATTRIBUTE_DIRECTORY;
 374                                 }
 375                         }
 376                 } else {
 377                         ERROR_WITH_ERRNO("Failed to read target of "
 378                                          "symbolic link `%s'", root_disk_path);
 379                         ret = WIMLIB_ERR_READLINK;
 380                 }
 381         }
 382 out:
 383         if (ret == 0)
 384                 *root_ret = root;
 385         else
 386                 free_dentry_tree(root, lookup_table);
 387         return ret;
 388 }
 389
 390
 391 enum pattern_type {
 392         NONE = 0,
 393         EXCLUSION_LIST,
 394         EXCLUSION_EXCEPTION,
 395         COMPRESSION_EXCLUSION_LIST,
 396         ALIGNMENT_LIST,
 397 };
 398
 399 /* Default capture configuration file when none is specified. */
 400 static const char *default_config =
 401 "[ExclusionList]\n"
 402 "\\$ntfs.log\n"
 403 "\\hiberfil.sys\n"
 404 "\\pagefile.sys\n"
 405 "\\System Volume Information\n"
 406 "\\RECYCLER\n"
 407 "\\Windows\\CSC\n"
 408 "\n"
 409 "[CompressionExclusionList]\n"
 410 "*.mp3\n"
 411 "*.zip\n"
 412 "*.cab\n"
 413 "\\WINDOWS\\inf\\*.pnf\n";
 414
 415 static void destroy_pattern_list(struct pattern_list *list)
 416 {
 417         FREE(list->pats);
 418 }
 419
 420 static void destroy_capture_config(struct capture_config *config)
 421 {
 422         destroy_pattern_list(&config->exclusion_list);
 423         destroy_pattern_list(&config->exclusion_exception);
 424         destroy_pattern_list(&config->compression_exclusion_list);
 425         destroy_pattern_list(&config->alignment_list);
 426         FREE(config->config_str);
 427         FREE(config->prefix);
 428         memset(config, 0, sizeof(*config));
 429 }
 430
 431 static int pattern_list_add_pattern(struct pattern_list *list,
 432                                     const char *pattern)
 433 {
 434         const char **pats;
 435         if (list->num_pats >= list->num_allocated_pats) {
 436                 pats = REALLOC(list->pats,
 437                                sizeof(list->pats[0]) * (list->num_allocated_pats + 8));
 438                 if (!pats)
 439                         return WIMLIB_ERR_NOMEM;
 440                 list->num_allocated_pats += 8;
 441                 list->pats = pats;
 442         }
 443         list->pats[list->num_pats++] = pattern;
 444         return 0;
 445 }
 446
 447 /* Parses the contents of the image capture configuration file and fills in a
 448  * `struct capture_config'. */
 449 static int init_capture_config(const char *_config_str, size_t config_len,
 450                                const char *_prefix, struct capture_config *config)
 451 {
 452         char *config_str;
 453         char *prefix;
 454         char *p;
 455         char *eol;
 456         char *next_p;
 457         size_t bytes_remaining;
 458         enum pattern_type type = NONE;
 459         int ret;
 460         unsigned long line_no = 0;
 461
 462         DEBUG("config_len = %zu", config_len);
 463         bytes_remaining = config_len;
 464         memset(config, 0, sizeof(*config));
 465         config_str = MALLOC(config_len);
 466         if (!config_str) {
 467                 ERROR("Could not duplicate capture config string");
 468                 return WIMLIB_ERR_NOMEM;
 469         }
 470         prefix = STRDUP(_prefix);
 471         if (!prefix) {
 472                 FREE(config_str);
 473                 return WIMLIB_ERR_NOMEM;
 474         }
 475
 476         memcpy(config_str, _config_str, config_len);
 477         next_p = config_str;
 478         config->config_str = config_str;
 479         config->prefix = prefix;
 480         config->prefix_len = strlen(prefix);
 481         while (bytes_remaining) {
 482                 line_no++;
 483                 p = next_p;
 484                 eol = memchr(p, '\n', bytes_remaining);
 485                 if (!eol) {
 486                         ERROR("Expected end-of-line in capture config file on "
 487                               "line %lu", line_no);
 488                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 489                         goto out_destroy;
 490                 }
 491
 492                 next_p = eol + 1;
 493                 bytes_remaining -= (next_p - p);
 494                 if (eol == p)
 495                         continue;
 496
 497                 if (*(eol - 1) == '\r')
 498                         eol--;
 499                 *eol = '\0';
 500
 501                 /* Translate backslash to forward slash */
 502                 for (char *pp = p; pp != eol; pp++)
 503                         if (*pp == '\\')
 504                                 *pp = '/';
 505
 506                 /* Remove drive letter */
 507                 if (eol - p > 2 && isalpha(*p) && *(p + 1) == ':')
 508                         p += 2;
 509
 510                 ret = 0;
 511                 if (strcmp(p, "[ExclusionList]") == 0)
 512                         type = EXCLUSION_LIST;
 513                 else if (strcmp(p, "[ExclusionException]") == 0)
 514                         type = EXCLUSION_EXCEPTION;
 515                 else if (strcmp(p, "[CompressionExclusionList]") == 0)
 516                         type = COMPRESSION_EXCLUSION_LIST;
 517                 else if (strcmp(p, "[AlignmentList]") == 0)
 518                         type = ALIGNMENT_LIST;
 519                 else if (p[0] == '[' && strrchr(p, ']')) {
 520                         ERROR("Unknown capture configuration section `%s'", p);
 521                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 522                 } else switch (type) {
 523                 case EXCLUSION_LIST:
 524                         DEBUG("Adding pattern \"%s\" to exclusion list", p);
 525                         ret = pattern_list_add_pattern(&config->exclusion_list, p);
 526                         break;
 527                 case EXCLUSION_EXCEPTION:
 528                         DEBUG("Adding pattern \"%s\" to exclusion exception list", p);
 529                         ret = pattern_list_add_pattern(&config->exclusion_exception, p);
 530                         break;
 531                 case COMPRESSION_EXCLUSION_LIST:
 532                         DEBUG("Adding pattern \"%s\" to compression exclusion list", p);
 533                         ret = pattern_list_add_pattern(&config->compression_exclusion_list, p);
 534                         break;
 535                 case ALIGNMENT_LIST:
 536                         DEBUG("Adding pattern \"%s\" to alignment list", p);
 537                         ret = pattern_list_add_pattern(&config->alignment_list, p);
 538                         break;
 539                 default:
 540                         ERROR("Line %lu of capture configuration is not "
 541                               "in a block (such as [ExclusionList])",
 542                               line_no);
 543                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 544                         break;
 545                 }
 546                 if (ret != 0)
 547                         goto out_destroy;
 548         }
 549         return 0;
 550 out_destroy:
 551         destroy_capture_config(config);
 552         return ret;
 553 }
 554
 555 static bool match_pattern(const char *path, const char *path_basename,
 556                           const struct pattern_list *list)
 557 {
 558         for (size_t i = 0; i < list->num_pats; i++) {
 559                 const char *pat = list->pats[i];
 560                 const char *string;
 561                 if (pat[0] == '/')
 562                         /* Absolute path from root of capture */
 563                         string = path;
 564                 else {
 565                         if (strchr(pat, '/'))
 566                                 /* Relative path from root of capture */
 567                                 string = path + 1;
 568                         else
 569                                 /* A file name pattern */
 570                                 string = path_basename;
 571                 }
 572                 if (fnmatch(pat, string, FNM_PATHNAME
 573                         #ifdef FNM_CASEFOLD
 574                                         | FNM_CASEFOLD
 575                         #endif
 576                         ) == 0)
 577                 {
 578                         DEBUG("`%s' matches the pattern \"%s\"",
 579                               string, pat);
 580                         return true;
 581                 }
 582         }
 583         return false;
 584 }
 585
 586 static void print_pattern_list(const struct pattern_list *list)
 587 {
 588         for (size_t i = 0; i < list->num_pats; i++)
 589                 printf("    %s\n", list->pats[i]);
 590 }
 591
 592 static void print_capture_config(const struct capture_config *config)
 593 {
 594         if (config->exclusion_list.num_pats) {
 595                 puts("Files or folders excluded from image capture:");
 596                 print_pattern_list(&config->exclusion_list);
 597                 putchar('\n');
 598         }
 599 }
 600
 601 /* Return true if the image capture configuration file indicates we should
 602  * exclude the filename @path from capture.
 603  *
 604  * If @exclude_prefix is %true, the part of the path up and including the name
 605  * of the directory being captured is not included in the path for matching
 606  * purposes.  This allows, for example, a pattern like /hiberfil.sys to match a
 607  * file /mnt/windows7/hiberfil.sys if we are capturing the /mnt/windows7
 608  * directory.
 609  */
 610 bool exclude_path(const char *path, const struct capture_config *config,
 611                   bool exclude_prefix)
 612 {
 613         const char *basename = path_basename(path);
 614         if (exclude_prefix) {
 615                 wimlib_assert(strlen(path) >= config->prefix_len);
 616                 if (memcmp(config->prefix, path, config->prefix_len) == 0
 617                      && path[config->prefix_len] == '/')
 618                         path += config->prefix_len;
 619         }
 620         return match_pattern(path, basename, &config->exclusion_list) &&
 621                 !match_pattern(path, basename, &config->exclusion_exception);
 622
 623 }
 624
 625 WIMLIBAPI int wimlib_add_image(WIMStruct *w, const char *source,
 626                                const char *name, const char *config_str,
 627                                size_t config_len, int add_image_flags,
 628                                wimlib_progress_func_t progress_func)
 629 {
 630         int (*capture_tree)(struct wim_dentry **, const char *,
 631                             struct wim_lookup_table *,
 632                             struct wim_security_data *,
 633                             const struct capture_config *,
 634                             int, wimlib_progress_func_t, void *);
 635         void *extra_arg;
 636
 637         struct wim_dentry *root_dentry = NULL;
 638         struct wim_security_data *sd;
 639         struct capture_config config;
 640         struct wim_image_metadata *imd;
 641         int ret;
 642
 643         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_NTFS) {
 644 #ifdef WITH_NTFS_3G
 645                 if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE) {
 646                         ERROR("Cannot dereference files when capturing directly from NTFS");
 647                         return WIMLIB_ERR_INVALID_PARAM;
 648                 }
 649                 if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) {
 650                         ERROR("Capturing UNIX owner and mode not supported "
 651                               "when capturing directly from NTFS");
 652                         return WIMLIB_ERR_INVALID_PARAM;
 653                 }
 654                 capture_tree = build_dentry_tree_ntfs;
 655                 extra_arg = &w->ntfs_vol;
 656 #else
 657                 ERROR("wimlib was compiled without support for NTFS-3g, so\n"
 658                       "        cannot capture a WIM image directly from a NTFS volume!");
 659                 return WIMLIB_ERR_UNSUPPORTED;
 660 #endif
 661         } else {
 662                 capture_tree = build_dentry_tree;
 663                 extra_arg = NULL;
 664         }
 665
 666         DEBUG("Adding dentry tree from directory or NTFS volume `%s'.", source);
 667
 668         if (!name || !*name) {
 669                 ERROR("Must specify a non-empty string for the image name");
 670                 return WIMLIB_ERR_INVALID_PARAM;
 671         }
 672         if (!source || !*source) {
 673                 ERROR("Must specify the name of a directory or NTFS volume");
 674                 return WIMLIB_ERR_INVALID_PARAM;
 675         }
 676
 677         if (w->hdr.total_parts != 1) {
 678                 ERROR("Cannot add an image to a split WIM");
 679                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 680         }
 681
 682         if (wimlib_image_name_in_use(w, name)) {
 683                 ERROR("There is already an image named \"%s\" in `%s'",
 684                       name, w->filename);
 685                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 686         }
 687
 688         DEBUG("Initializing capture configuration");
 689         if (!config_str) {
 690                 DEBUG("Using default capture configuration");
 691                 config_str = default_config;
 692                 config_len = strlen(default_config);
 693         }
 694         ret = init_capture_config(config_str, config_len, source, &config);
 695         if (ret != 0)
 696                 return ret;
 697         print_capture_config(&config);
 698
 699         DEBUG("Allocating security data");
 700
 701         sd = CALLOC(1, sizeof(struct wim_security_data));
 702         if (!sd) {
 703                 ret = WIMLIB_ERR_NOMEM;
 704                 goto out_destroy_config;
 705         }
 706         sd->total_length = 8;
 707         sd->refcnt = 1;
 708
 709         if (progress_func) {
 710                 union wimlib_progress_info progress;
 711                 progress.scan.source = source;
 712                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &progress);
 713         }
 714
 715         DEBUG("Building dentry tree.");
 716         ret = (*capture_tree)(&root_dentry, source, w->lookup_table, sd,
 717                               &config, add_image_flags | WIMLIB_ADD_IMAGE_FLAG_ROOT,
 718                               progress_func, extra_arg);
 719         destroy_capture_config(&config);
 720
 721         if (ret != 0) {
 722                 ERROR("Failed to build dentry tree for `%s'", source);
 723                 goto out_free_security_data;
 724         }
 725
 726         if (progress_func) {
 727                 union wimlib_progress_info progress;
 728                 progress.scan.source = source;
 729                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &progress);
 730         }
 731
 732         DEBUG("Calculating full paths of dentries.");
 733         ret = for_dentry_in_tree(root_dentry, calculate_dentry_full_path, NULL);
 734         if (ret != 0)
 735                 goto out_free_dentry_tree;
 736
 737         ret = add_new_dentry_tree(w, root_dentry, sd);
 738         if (ret != 0)
 739                 goto out_free_dentry_tree;
 740
 741         imd = &w->image_metadata[w->hdr.image_count - 1];
 742
 743         ret = dentry_tree_fix_inodes(root_dentry, &imd->inode_list);
 744         if (ret != 0)
 745                 goto out_destroy_imd;
 746
 747         DEBUG("Assigning hard link group IDs");
 748         assign_inode_numbers(&imd->inode_list);
 749
 750         ret = xml_add_image(w, name);
 751         if (ret != 0)
 752                 goto out_destroy_imd;
 753
 754         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_BOOT)
 755                 wimlib_set_boot_idx(w, w->hdr.image_count);
 756         return 0;
 757 out_destroy_imd:
 758         destroy_image_metadata(&w->image_metadata[w->hdr.image_count - 1],
 759                                w->lookup_table);
 760         w->hdr.image_count--;
 761         return ret;
 762 out_free_dentry_tree:
 763         free_dentry_tree(root_dentry, w->lookup_table);
 764 out_free_security_data:
 765         free_security_data(sd);
 766 out_destroy_config:
 767         destroy_capture_config(&config);
 768         return ret;
 769 }