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

   1 /*
   2  * add_image.c
   3  */
   4
   5 /*
   6  * Copyright (C) 2012, 2013 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 "config.h"
  25
  26 #ifdef __WIN32__
  27 #  include "win32.h"
  28 #else
  29 #  include <dirent.h>
  30 #  include <sys/stat.h>
  31 #  include <fnmatch.h>
  32 #  include "timestamp.h"
  33 #endif
  34
  35 #include "wimlib_internal.h"
  36 #include "dentry.h"
  37 #include "lookup_table.h"
  38 #include "xml.h"
  39 #include "security.h"
  40
  41 #include <ctype.h>
  42 #include <errno.h>
  43 #include <stdlib.h>
  44 #include <limits.h>
  45 #include <string.h>
  46
  47 #include <unistd.h>
  48
  49 #ifdef HAVE_ALLOCA_H
  50 #  include <alloca.h>
  51 #endif
  52
  53 /*
  54  * Adds the dentry tree and security data for a new image to the image metadata
  55  * array of the WIMStruct.
  56  */
  57 static int
  58 add_new_dentry_tree(WIMStruct *w, struct wim_dentry *root_dentry,
  59                     struct wim_security_data *sd)
  60 {
  61         struct wim_image_metadata *new_imd;
  62         struct wim_lookup_table_entry *metadata_lte;
  63         int ret;
  64
  65         metadata_lte = new_lookup_table_entry();
  66         if (!metadata_lte)
  67                 return WIMLIB_ERR_NOMEM;
  68
  69         metadata_lte->resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
  70         metadata_lte->unhashed = 1;
  71
  72         new_imd = new_image_metadata();
  73         if (!new_imd) {
  74                 free_lookup_table_entry(metadata_lte);
  75                 return WIMLIB_ERR_NOMEM;
  76         }
  77
  78         new_imd->root_dentry    = root_dentry;
  79         new_imd->metadata_lte   = metadata_lte;
  80         new_imd->security_data  = sd;
  81         new_imd->modified       = 1;
  82
  83         ret = append_image_metadata(w, new_imd);
  84         if (ret)
  85                 put_image_metadata(new_imd, NULL);
  86         return ret;
  87
  88 }
  89
  90 #ifndef __WIN32__
  91
  92 static int
  93 unix_capture_regular_file(const char *path,
  94                           u64 size,
  95                           struct wim_inode *inode,
  96                           struct wim_lookup_table *lookup_table)
  97 {
  98         inode->i_attributes = FILE_ATTRIBUTE_NORMAL;
  99
 100         /* Empty files do not have to have a lookup table entry. */
 101         if (size != 0) {
 102                 struct wim_lookup_table_entry *lte;
 103                 char *file_on_disk;
 104
 105                 file_on_disk = STRDUP(path);
 106                 if (!file_on_disk)
 107                         return WIMLIB_ERR_NOMEM;
 108                 lte = new_lookup_table_entry();
 109                 if (!lte) {
 110                         FREE(file_on_disk);
 111                         return WIMLIB_ERR_NOMEM;
 112                 }
 113                 lte->file_on_disk = file_on_disk;
 114                 lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
 115                 lte->resource_entry.original_size = size;
 116                 lookup_table_insert_unhashed(lookup_table, lte, inode, 0);
 117                 inode->i_lte = lte;
 118         }
 119         return 0;
 120 }
 121
 122 static int
 123 unix_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 124                                  char *path,
 125                                  size_t path_len,
 126                                  struct add_image_params *params);
 127
 128 static int
 129 unix_capture_directory(struct wim_dentry *dir_dentry,
 130                        char *path,
 131                        size_t path_len,
 132                        struct add_image_params *params)
 133 {
 134
 135         DIR *dir;
 136         struct dirent *entry;
 137         struct wim_dentry *child;
 138         int ret;
 139
 140         dir_dentry->d_inode->i_attributes = FILE_ATTRIBUTE_DIRECTORY;
 141         dir = opendir(path);
 142         if (!dir) {
 143                 ERROR_WITH_ERRNO("Failed to open the directory `%s'",
 144                                  path);
 145                 return WIMLIB_ERR_OPEN;
 146         }
 147
 148         /* Recurse on directory contents */
 149         for (;;) {
 150                 errno = 0;
 151                 entry = readdir(dir);
 152                 if (!entry) {
 153                         if (errno) {
 154                                 ret = WIMLIB_ERR_READ;
 155                                 ERROR_WITH_ERRNO("Error reading the "
 156                                                  "directory `%s'", path);
 157                         }
 158                         break;
 159                 }
 160
 161                 if (entry->d_name[0] == '.' && (entry->d_name[1] == '\0'
 162                       || (entry->d_name[1] == '.' && entry->d_name[2] == '\0')))
 163                                 continue;
 164
 165                 size_t name_len = strlen(entry->d_name);
 166
 167                 path[path_len] = '/';
 168                 memcpy(&path[path_len + 1], entry->d_name, name_len + 1);
 169                 ret = unix_build_dentry_tree_recursive(&child,
 170                                                        path,
 171                                                        path_len + 1 + name_len,
 172                                                        params);
 173                 if (ret)
 174                         break;
 175                 if (child)
 176                         dentry_add_child(dir_dentry, child);
 177         }
 178         closedir(dir);
 179         return ret;
 180 }
 181
 182 static int
 183 unix_capture_symlink(struct wim_dentry **root_p,
 184                      const char *path,
 185                      struct wim_inode *inode,
 186                      struct add_image_params *params)
 187 {
 188         char deref_name_buf[4096];
 189         ssize_t deref_name_len;
 190         int ret;
 191
 192         inode->i_attributes = FILE_ATTRIBUTE_REPARSE_POINT;
 193         inode->i_reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
 194
 195         /* The idea here is to call readlink() to get the UNIX target of
 196          * the symbolic link, then turn the target into a reparse point
 197          * data buffer that contains a relative or absolute symbolic
 198          * link (NOT a junction point or *full* path symbolic link with
 199          * drive letter).
 200          */
 201         deref_name_len = readlink(path, deref_name_buf,
 202                                   sizeof(deref_name_buf) - 1);
 203         if (deref_name_len >= 0) {
 204                 char *dest = deref_name_buf;
 205
 206                 dest[deref_name_len] = '\0';
 207                 DEBUG("Read symlink `%s'", dest);
 208
 209                 if ((params->add_image_flags & WIMLIB_ADD_IMAGE_FLAG_RPFIX) &&
 210                      dest[0] == '/')
 211                 {
 212                         dest = fixup_symlink(dest,
 213                                              params->capture_root_ino,
 214                                              params->capture_root_dev);
 215                         if (!dest) {
 216                                 WARNING("Ignoring out of tree absolute symlink "
 217                                         "\"%s\" -> \"%s\"\n"
 218                                         "          (Use --norpfix to capture "
 219                                         "absolute symlinks as-is)",
 220                                         path, deref_name_buf);
 221                                 free_dentry(*root_p);
 222                                 *root_p = NULL;
 223                                 return 0;
 224                         }
 225                         inode->i_not_rpfixed = 0;
 226                 }
 227                 ret = inode_set_symlink(inode, dest,
 228                                         params->lookup_table, NULL);
 229                 if (ret == 0) {
 230                         /* Unfortunately, Windows seems to have the concept of
 231                          * "file" symbolic links as being different from
 232                          * "directory" symbolic links...  so
 233                          * FILE_ATTRIBUTE_DIRECTORY needs to be set on the
 234                          * symbolic link if the *target* of the symbolic link is
 235                          * a directory.  */
 236                         struct stat stbuf;
 237                         if (stat(path, &stbuf) == 0 && S_ISDIR(stbuf.st_mode))
 238                                 inode->i_attributes |= FILE_ATTRIBUTE_DIRECTORY;
 239                 }
 240         } else {
 241                 ERROR_WITH_ERRNO("Failed to read target of "
 242                                  "symbolic link `%s'", path);
 243                 ret = WIMLIB_ERR_READLINK;
 244         }
 245         return ret;
 246 }
 247
 248 static int
 249 unix_build_dentry_tree_recursive(struct wim_dentry **root_ret,
 250                                  char *path,
 251                                  size_t path_len,
 252                                  struct add_image_params *params)
 253 {
 254         struct wim_dentry *root = NULL;
 255         int ret = 0;
 256         struct wim_inode *inode;
 257
 258         if (exclude_path(path, path_len, params->config, true)) {
 259                 if ((params->add_image_flags & WIMLIB_ADD_IMAGE_FLAG_EXCLUDE_VERBOSE)
 260                     && params->progress_func)
 261                 {
 262                         union wimlib_progress_info info;
 263                         info.scan.cur_path = path;
 264                         info.scan.excluded = true;
 265                         params->progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 266                 }
 267                 goto out;
 268         }
 269
 270         if ((params->add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 271             && params->progress_func)
 272         {
 273                 union wimlib_progress_info info;
 274                 info.scan.cur_path = path;
 275                 info.scan.excluded = false;
 276                 params->progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 277         }
 278
 279         struct stat stbuf;
 280         int (*stat_fn)(const char *restrict, struct stat *restrict);
 281         if ((params->add_image_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE) ||
 282             (params->add_image_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT))
 283                 stat_fn = stat;
 284         else
 285                 stat_fn = lstat;
 286
 287         ret = (*stat_fn)(path, &stbuf);
 288         if (ret != 0) {
 289                 ERROR_WITH_ERRNO("Failed to stat `%s'", path);
 290                 goto out;
 291         }
 292         if (!S_ISREG(stbuf.st_mode) && !S_ISDIR(stbuf.st_mode)
 293             && !S_ISLNK(stbuf.st_mode)) {
 294                 ERROR("`%s' is not a regular file, directory, or symbolic link.",
 295                       path);
 296                 ret = WIMLIB_ERR_SPECIAL_FILE;
 297                 goto out;
 298         }
 299
 300         ret = inode_table_new_dentry(params->inode_table,
 301                                      path_basename_with_len(path, path_len),
 302                                      stbuf.st_ino,
 303                                      stbuf.st_dev,
 304                                      &root);
 305         if (ret)
 306                 goto out;
 307
 308         inode = root->d_inode;
 309
 310         if (inode->i_nlink > 1) /* Already captured this inode? */
 311                 goto out;
 312
 313 #ifdef HAVE_STAT_NANOSECOND_PRECISION
 314         inode->i_creation_time = timespec_to_wim_timestamp(stbuf.st_mtim);
 315         inode->i_last_write_time = timespec_to_wim_timestamp(stbuf.st_mtim);
 316         inode->i_last_access_time = timespec_to_wim_timestamp(stbuf.st_atim);
 317 #else
 318         inode->i_creation_time = unix_timestamp_to_wim(stbuf.st_mtime);
 319         inode->i_last_write_time = unix_timestamp_to_wim(stbuf.st_mtime);
 320         inode->i_last_access_time = unix_timestamp_to_wim(stbuf.st_atime);
 321 #endif
 322         inode->i_resolved = 1;
 323         if (params->add_image_flags & WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) {
 324                 ret = inode_set_unix_data(inode, stbuf.st_uid,
 325                                           stbuf.st_gid,
 326                                           stbuf.st_mode,
 327                                           params->lookup_table,
 328                                           UNIX_DATA_ALL | UNIX_DATA_CREATE);
 329                 if (ret)
 330                         goto out;
 331         }
 332         params->add_image_flags &=
 333                 ~(WIMLIB_ADD_IMAGE_FLAG_ROOT | WIMLIB_ADD_IMAGE_FLAG_SOURCE);
 334         if (S_ISREG(stbuf.st_mode))
 335                 ret = unix_capture_regular_file(path, stbuf.st_size,
 336                                                 inode, params->lookup_table);
 337         else if (S_ISDIR(stbuf.st_mode))
 338                 ret = unix_capture_directory(root, path, path_len, params);
 339         else
 340                 ret = unix_capture_symlink(&root, path, inode, params);
 341 out:
 342         if (ret == 0)
 343                 *root_ret = root;
 344         else
 345                 free_dentry_tree(root, params->lookup_table);
 346         return ret;
 347 }
 348
 349 /*
 350  * unix_build_dentry_tree():
 351  *      Builds a tree of WIM dentries from an on-disk directory tree (UNIX
 352  *      version; no NTFS-specific data is captured).
 353  *
 354  * @root_ret:   Place to return a pointer to the root of the dentry tree.  Only
 355  *              modified if successful.  Set to NULL if the file or directory was
 356  *              excluded from capture.
 357  *
 358  * @root_disk_path:  The path to the root of the directory tree on disk.
 359  *
 360  * @params:     See doc for `struct add_image_params'.
 361  *
 362  * @return:     0 on success, nonzero on failure.  It is a failure if any of
 363  *              the files cannot be `stat'ed, or if any of the needed
 364  *              directories cannot be opened or read.  Failure to add the files
 365  *              to the WIM may still occur later when trying to actually read
 366  *              the on-disk files during a call to wimlib_write() or
 367  *              wimlib_overwrite().
 368  */
 369 static int
 370 unix_build_dentry_tree(struct wim_dentry **root_ret,
 371                        const char *root_disk_path,
 372                        struct add_image_params *params)
 373 {
 374         char *path_buf;
 375         int ret;
 376         size_t path_len;
 377         size_t path_bufsz;
 378
 379         {
 380                 struct stat root_stbuf;
 381                 if (stat(root_disk_path, &root_stbuf)) {
 382                         ERROR_WITH_ERRNO("Failed to stat \"%s\"", root_disk_path);
 383                         return WIMLIB_ERR_STAT;
 384                 }
 385
 386                 if ((params->add_image_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) &&
 387                     !S_ISDIR(root_stbuf.st_mode))
 388                 {
 389                         ERROR("Root of capture \"%s\" is not a directory",
 390                               root_disk_path);
 391                         return WIMLIB_ERR_NOTDIR;
 392                 }
 393                 params->capture_root_ino = root_stbuf.st_ino;
 394                 params->capture_root_dev = root_stbuf.st_dev;
 395         }
 396
 397         path_bufsz = min(32790, PATH_MAX + 1);
 398         path_len = strlen(root_disk_path);
 399
 400         if (path_len >= path_bufsz)
 401                 return WIMLIB_ERR_INVALID_PARAM;
 402
 403         path_buf = MALLOC(path_bufsz);
 404         if (!path_buf)
 405                 return WIMLIB_ERR_NOMEM;
 406         memcpy(path_buf, root_disk_path, path_len + 1);
 407
 408         ret = unix_build_dentry_tree_recursive(root_ret, path_buf,
 409                                                path_len, params);
 410         FREE(path_buf);
 411         return ret;
 412 }
 413 #endif /* !__WIN32__ */
 414
 415 static bool
 416 match_pattern(const tchar *path,
 417               const tchar *path_basename,
 418               const struct wimlib_pattern_list *list)
 419 {
 420         for (size_t i = 0; i < list->num_pats; i++) {
 421
 422                 const tchar *pat = list->pats[i];
 423                 const tchar *string;
 424
 425                 if (*pat == T('/')) {
 426                         /* Absolute path from root of capture */
 427                         string = path;
 428                 } else {
 429                         if (tstrchr(pat, T('/')))
 430                                 /* Relative path from root of capture */
 431                                 string = path + 1;
 432                         else
 433                                 /* A file name pattern */
 434                                 string = path_basename;
 435                 }
 436
 437                 /* Warning: on Windows native builds, fnmatch() calls the
 438                  * replacement function in win32.c. */
 439                 if (fnmatch(pat, string, FNM_PATHNAME | FNM_NOESCAPE
 440                                 #ifdef FNM_CASEFOLD
 441                                         | FNM_CASEFOLD
 442                                 #endif
 443                             ) == 0)
 444                 {
 445                         DEBUG("\"%"TS"\" matches the pattern \"%"TS"\"",
 446                               string, pat);
 447                         return true;
 448                 } else {
 449                         DEBUG2("\"%"TS"\" does not match the pattern \"%"TS"\"",
 450                                string, pat);
 451                 }
 452         }
 453         return false;
 454 }
 455
 456 /* Return true if the image capture configuration file indicates we should
 457  * exclude the filename @path from capture.
 458  *
 459  * If @exclude_prefix is %true, the part of the path up and including the name
 460  * of the directory being captured is not included in the path for matching
 461  * purposes.  This allows, for example, a pattern like /hiberfil.sys to match a
 462  * file /mnt/windows7/hiberfil.sys if we are capturing the /mnt/windows7
 463  * directory.
 464  */
 465 bool
 466 exclude_path(const tchar *path, size_t path_len,
 467              const struct wimlib_capture_config *config, bool exclude_prefix)
 468 {
 469         const tchar *basename = path_basename_with_len(path, path_len);
 470         if (exclude_prefix) {
 471                 wimlib_assert(path_len >= config->_prefix_num_tchars);
 472                 if (!tmemcmp(config->_prefix, path, config->_prefix_num_tchars) &&
 473                     path[config->_prefix_num_tchars] == T('/'))
 474                 {
 475                         path += config->_prefix_num_tchars;
 476                 }
 477         }
 478         return match_pattern(path, basename, &config->exclusion_pats) &&
 479                 !match_pattern(path, basename, &config->exclusion_exception_pats);
 480
 481 }
 482
 483 /* Strip leading and trailing forward slashes from a string.  Modifies it in
 484  * place and returns the stripped string. */
 485 static const tchar *
 486 canonicalize_target_path(tchar *target_path)
 487 {
 488         tchar *p;
 489         if (target_path == NULL)
 490                 return T("");
 491         for (;;) {
 492                 if (*target_path == T('\0'))
 493                         return target_path;
 494                 else if (*target_path == T('/'))
 495                         target_path++;
 496                 else
 497                         break;
 498         }
 499
 500         p = tstrchr(target_path, T('\0')) - 1;
 501         while (*p == T('/'))
 502                 *p-- = T('\0');
 503         return target_path;
 504 }
 505
 506 /* Strip leading and trailing slashes from the target paths, and translate all
 507  * backslashes in the source and target paths into forward slashes. */
 508 static void
 509 canonicalize_sources_and_targets(struct wimlib_capture_source *sources,
 510                                  size_t num_sources)
 511 {
 512         while (num_sources--) {
 513                 DEBUG("Canonicalizing { source: \"%"TS"\", target=\"%"TS"\"}",
 514                       sources->fs_source_path,
 515                       sources->wim_target_path);
 516
 517                 /* The Windows API can handle forward slashes.  Just get rid of
 518                  * backslashes to avoid confusing other parts of the library
 519                  * code. */
 520                 zap_backslashes(sources->fs_source_path);
 521                 if (sources->wim_target_path)
 522                         zap_backslashes(sources->wim_target_path);
 523
 524                 sources->wim_target_path =
 525                         (tchar*)canonicalize_target_path(sources->wim_target_path);
 526                 DEBUG("Canonical target: \"%"TS"\"", sources->wim_target_path);
 527                 sources++;
 528         }
 529 }
 530
 531 static int
 532 capture_source_cmp(const void *p1, const void *p2)
 533 {
 534         const struct wimlib_capture_source *s1 = p1, *s2 = p2;
 535         return tstrcmp(s1->wim_target_path, s2->wim_target_path);
 536 }
 537
 538 /* Sorts the capture sources lexicographically by target path.  This occurs
 539  * after leading and trailing forward slashes are stripped.
 540  *
 541  * One purpose of this is to make sure that target paths that are inside other
 542  * target paths are added after the containing target paths. */
 543 static void
 544 sort_sources(struct wimlib_capture_source *sources, size_t num_sources)
 545 {
 546         qsort(sources, num_sources, sizeof(sources[0]), capture_source_cmp);
 547 }
 548
 549 static int
 550 check_sorted_sources(struct wimlib_capture_source *sources, size_t num_sources,
 551                      int add_image_flags)
 552 {
 553         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_NTFS) {
 554                 if (num_sources != 1) {
 555                         ERROR("Must specify exactly 1 capture source "
 556                               "(the NTFS volume) in NTFS mode!");
 557                         return WIMLIB_ERR_INVALID_PARAM;
 558                 }
 559                 if (sources[0].wim_target_path[0] != T('\0')) {
 560                         ERROR("In NTFS capture mode the target path inside "
 561                               "the image must be the root directory!");
 562                         return WIMLIB_ERR_INVALID_PARAM;
 563                 }
 564         } else if (num_sources != 0) {
 565                 /* This code is disabled because the current code
 566                  * unconditionally attempts to do overlays.  So, duplicate
 567                  * target paths are OK. */
 568         #if 0
 569                 if (num_sources > 1 && sources[0].wim_target_path[0] == '\0') {
 570                         ERROR("Cannot specify root target when using multiple "
 571                               "capture sources!");
 572                         return WIMLIB_ERR_INVALID_PARAM;
 573                 }
 574                 for (size_t i = 0; i < num_sources - 1; i++) {
 575                         size_t len = strlen(sources[i].wim_target_path);
 576                         size_t j = i + 1;
 577                         const char *target1 = sources[i].wim_target_path;
 578                         do {
 579                                 const char *target2 = sources[j].wim_target_path;
 580                                 DEBUG("target1=%s, target2=%s",
 581                                       target1,target2);
 582                                 if (strncmp(target1, target2, len) ||
 583                                     target2[len] > '/')
 584                                         break;
 585                                 if (target2[len] == '/') {
 586                                         ERROR("Invalid target `%s': is a prefix of `%s'",
 587                                               target1, target2);
 588                                         return WIMLIB_ERR_INVALID_PARAM;
 589                                 }
 590                                 if (target2[len] == '\0') {
 591                                         ERROR("Invalid target `%s': is a duplicate of `%s'",
 592                                               target1, target2);
 593                                         return WIMLIB_ERR_INVALID_PARAM;
 594                                 }
 595                         } while (++j != num_sources);
 596                 }
 597         #endif
 598         }
 599         return 0;
 600
 601 }
 602
 603 /* Creates a new directory to place in the WIM image.  This is to create parent
 604  * directories that are not part of any target as needed.  */
 605 static int
 606 new_filler_directory(const tchar *name, struct wim_dentry **dentry_ret)
 607 {
 608         int ret;
 609         struct wim_dentry *dentry;
 610
 611         DEBUG("Creating filler directory \"%"TS"\"", name);
 612         ret = new_dentry_with_inode(name, &dentry);
 613         if (ret == 0) {
 614                 /* Leave the inode number as 0; this is allowed for non
 615                  * hard-linked files. */
 616                 dentry->d_inode->i_resolved = 1;
 617                 dentry->d_inode->i_attributes = FILE_ATTRIBUTE_DIRECTORY;
 618                 *dentry_ret = dentry;
 619         }
 620         return ret;
 621 }
 622
 623 /* Transfers the children of @branch to @target.  It is an error if @target is
 624  * not a directory or if both @branch and @target contain a child dentry with
 625  * the same name. */
 626 static int
 627 do_overlay(struct wim_dentry *target, struct wim_dentry *branch)
 628 {
 629         struct rb_root *rb_root;
 630
 631         DEBUG("Doing overlay \"%"WS"\" => \"%"WS"\"",
 632               branch->file_name, target->file_name);
 633
 634         if (!dentry_is_directory(target)) {
 635                 ERROR("Cannot overlay directory \"%"WS"\" "
 636                       "over non-directory", branch->file_name);
 637                 return WIMLIB_ERR_INVALID_OVERLAY;
 638         }
 639
 640         rb_root = &branch->d_inode->i_children;
 641         while (rb_root->rb_node) { /* While @branch has children... */
 642                 struct wim_dentry *child = rbnode_dentry(rb_root->rb_node);
 643                 /* Move @child to the directory @target */
 644                 unlink_dentry(child);
 645                 if (!dentry_add_child(target, child)) {
 646                         /* Revert the change to avoid leaking the directory tree
 647                          * rooted at @child */
 648                         dentry_add_child(branch, child);
 649                         ERROR("Overlay error: file \"%"WS"\" already exists "
 650                               "as a child of \"%"WS"\"",
 651                               child->file_name, target->file_name);
 652                         return WIMLIB_ERR_INVALID_OVERLAY;
 653                 }
 654         }
 655         free_dentry(branch);
 656         return 0;
 657
 658 }
 659
 660 /* Attach or overlay a branch onto the WIM image.
 661  *
 662  * @root_p:
 663  *      Pointer to the root of the WIM image, or pointer to NULL if it has not
 664  *      been created yet.
 665  * @branch
 666  *      Branch to add.
 667  * @target_path:
 668  *      Path in the WIM image to add the branch, with leading and trailing
 669  *      slashes stripped.
 670  */
 671 static int
 672 attach_branch(struct wim_dentry **root_p, struct wim_dentry *branch,
 673               tchar *target_path)
 674 {
 675         tchar *slash;
 676         struct wim_dentry *dentry, *parent, *target;
 677         int ret;
 678
 679         DEBUG("Attaching branch \"%"WS"\" => \"%"TS"\"",
 680               branch->file_name, target_path);
 681
 682         if (*target_path == T('\0')) {
 683                 /* Target: root directory */
 684                 if (*root_p) {
 685                         /* Overlay on existing root */
 686                         return do_overlay(*root_p, branch);
 687                 } else  {
 688                         /* Set as root */
 689                         *root_p = branch;
 690                         return 0;
 691                 }
 692         }
 693
 694         /* Adding a non-root branch.  Create root if it hasn't been created
 695          * already. */
 696         if (!*root_p) {
 697                 ret  = new_filler_directory(T(""), root_p);
 698                 if (ret)
 699                         return ret;
 700         }
 701
 702         /* Walk the path to the branch, creating filler directories as needed.
 703          * */
 704         parent = *root_p;
 705         while ((slash = tstrchr(target_path, T('/')))) {
 706                 *slash = T('\0');
 707                 dentry = get_dentry_child_with_name(parent, target_path);
 708                 if (!dentry) {
 709                         ret = new_filler_directory(target_path, &dentry);
 710                         if (ret)
 711                                 return ret;
 712                         dentry_add_child(parent, dentry);
 713                 }
 714                 parent = dentry;
 715                 target_path = slash;
 716                 /* Skip over slashes.  Note: this cannot overrun the length of
 717                  * the string because the last character cannot be a slash, as
 718                  * trailing slashes were tripped.  */
 719                 do {
 720                         ++target_path;
 721                 } while (*target_path == T('/'));
 722         }
 723
 724         /* If the target path already existed, overlay the branch onto it.
 725          * Otherwise, set the branch as the target path. */
 726         target = get_dentry_child_with_utf16le_name(parent, branch->file_name,
 727                                                     branch->file_name_nbytes);
 728         if (target) {
 729                 return do_overlay(target, branch);
 730         } else {
 731                 dentry_add_child(parent, branch);
 732                 return 0;
 733         }
 734 }
 735
 736 static int
 737 canonicalize_pat(tchar **pat_p)
 738 {
 739         tchar *pat = *pat_p;
 740
 741         /* Turn all backslashes in the pattern into forward slashes. */
 742         zap_backslashes(pat);
 743
 744         if (*pat != T('/') && *pat != T('\0') && *(pat + 1) == T(':')) {
 745                 /* Pattern begins with drive letter */
 746                 if (*(pat + 2) != T('/')) {
 747                         /* Something like c:file, which is actually a path
 748                          * relative to the current working directory on the c:
 749                          * drive.  We require paths with drive letters to be
 750                          * absolute. */
 751                         ERROR("Invalid path \"%"TS"\"; paths including drive letters "
 752                               "must be absolute!", pat);
 753                         ERROR("Maybe try \"%"TC":/%"TS"\"?",
 754                               *pat, pat + 2);
 755                         return WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 756                 }
 757
 758                 WARNING("Pattern \"%"TS"\" starts with a drive letter, which is "
 759                         "being removed.", pat);
 760                 /* Strip the drive letter */
 761                 pat += 2;
 762                 *pat_p = pat;
 763         }
 764         return 0;
 765 }
 766
 767 static int
 768 canonicalize_pat_list(struct wimlib_pattern_list *pat_list)
 769 {
 770         int ret = 0;
 771         for (size_t i = 0; i < pat_list->num_pats; i++) {
 772                 ret = canonicalize_pat(&pat_list->pats[i]);
 773                 if (ret)
 774                         break;
 775         }
 776         return ret;
 777 }
 778
 779 static int
 780 canonicalize_capture_config(struct wimlib_capture_config *config)
 781 {
 782         int ret = canonicalize_pat_list(&config->exclusion_pats);
 783         if (ret)
 784                 return ret;
 785         return canonicalize_pat_list(&config->exclusion_exception_pats);
 786 }
 787
 788 WIMLIBAPI int
 789 wimlib_add_image_multisource(WIMStruct *w,
 790                              struct wimlib_capture_source *sources,
 791                              size_t num_sources,
 792                              const tchar *name,
 793                              struct wimlib_capture_config *config,
 794                              int add_image_flags,
 795                              wimlib_progress_func_t progress_func)
 796 {
 797         int (*capture_tree)(struct wim_dentry **,
 798                             const tchar *,
 799                             struct add_image_params *);
 800         void *extra_arg;
 801         struct wim_dentry *root_dentry;
 802         struct wim_dentry *branch;
 803         struct wim_security_data *sd;
 804         struct wim_image_metadata *imd;
 805         struct wim_inode_table inode_table;
 806         struct list_head unhashed_streams;
 807         struct add_image_params params;
 808         int ret;
 809         struct sd_set sd_set;
 810 #ifdef WITH_NTFS_3G
 811         struct _ntfs_volume *ntfs_vol = NULL;
 812 #endif
 813
 814         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_NTFS) {
 815 #ifdef WITH_NTFS_3G
 816                 if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE) {
 817                         ERROR("Cannot dereference files when capturing directly from NTFS");
 818                         return WIMLIB_ERR_INVALID_PARAM;
 819                 }
 820                 if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) {
 821                         ERROR("Capturing UNIX owner and mode not supported "
 822                               "when capturing directly from NTFS");
 823                         return WIMLIB_ERR_INVALID_PARAM;
 824                 }
 825                 capture_tree = build_dentry_tree_ntfs;
 826                 extra_arg = &ntfs_vol;
 827 #else
 828                 ERROR("wimlib was compiled without support for NTFS-3g, so\n"
 829                       "        cannot capture a WIM image directly from a NTFS volume!");
 830                 return WIMLIB_ERR_UNSUPPORTED;
 831 #endif
 832         } else {
 833         #ifdef __WIN32__
 834                 capture_tree = win32_build_dentry_tree;
 835         #else
 836                 capture_tree = unix_build_dentry_tree;
 837         #endif
 838                 extra_arg = NULL;
 839         }
 840
 841 #ifdef __WIN32__
 842         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) {
 843                 ERROR("Capturing UNIX-specific data is not supported on Windows");
 844                 return WIMLIB_ERR_INVALID_PARAM;
 845         }
 846         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE) {
 847                 ERROR("Dereferencing symbolic links is not supported on Windows");
 848                 return WIMLIB_ERR_INVALID_PARAM;
 849         }
 850 #endif
 851
 852         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 853                 add_image_flags |= WIMLIB_ADD_IMAGE_FLAG_EXCLUDE_VERBOSE;
 854
 855         if ((add_image_flags & (WIMLIB_ADD_IMAGE_FLAG_RPFIX |
 856                                 WIMLIB_ADD_IMAGE_FLAG_RPFIX)) ==
 857                 (WIMLIB_ADD_IMAGE_FLAG_RPFIX | WIMLIB_ADD_IMAGE_FLAG_NORPFIX))
 858         {
 859                 ERROR("Cannot specify RPFIX and NORPFIX flags at the same time!");
 860                 return WIMLIB_ERR_INVALID_PARAM;
 861         }
 862
 863         if ((add_image_flags & (WIMLIB_ADD_IMAGE_FLAG_RPFIX |
 864                                 WIMLIB_ADD_IMAGE_FLAG_NORPFIX)) == 0)
 865         {
 866                 /* Do reparse-point fixups by default if the header flag is set
 867                  * from previous images, or if this is the first image being
 868                  * added. */
 869                 if ((w->hdr.flags & WIM_HDR_FLAG_RP_FIX) || w->hdr.image_count == 0)
 870                         add_image_flags |= WIMLIB_ADD_IMAGE_FLAG_RPFIX;
 871         }
 872
 873         if (!name || !*name) {
 874                 ERROR("Must specify a non-empty string for the image name");
 875                 return WIMLIB_ERR_INVALID_PARAM;
 876         }
 877
 878         if (w->hdr.total_parts != 1) {
 879                 ERROR("Cannot add an image to a split WIM");
 880                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 881         }
 882
 883         if (wimlib_image_name_in_use(w, name)) {
 884                 ERROR("There is already an image named \"%"TS"\" in the WIM!",
 885                       name);
 886                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
 887         }
 888
 889         if (!config) {
 890                 DEBUG("Capture config not provided; using empty config");
 891                 config = alloca(sizeof(*config));
 892                 memset(config, 0, sizeof(*config));
 893         }
 894
 895         ret = canonicalize_capture_config(config);
 896         if (ret)
 897                 goto out;
 898
 899         ret = init_inode_table(&inode_table, 9001);
 900         if (ret)
 901                 goto out;
 902
 903         DEBUG("Allocating security data");
 904         sd = CALLOC(1, sizeof(struct wim_security_data));
 905         if (!sd) {
 906                 ret = WIMLIB_ERR_NOMEM;
 907                 goto out_destroy_inode_table;
 908         }
 909         sd->total_length = 8;
 910
 911         sd_set.sd = sd;
 912         sd_set.rb_root.rb_node = NULL;
 913
 914
 915         DEBUG("Using %zu capture sources", num_sources);
 916         canonicalize_sources_and_targets(sources, num_sources);
 917         sort_sources(sources, num_sources);
 918         ret = check_sorted_sources(sources, num_sources, add_image_flags);
 919         if (ret) {
 920                 ret = WIMLIB_ERR_INVALID_PARAM;
 921                 goto out_free_security_data;
 922         }
 923
 924         INIT_LIST_HEAD(&unhashed_streams);
 925         w->lookup_table->unhashed_streams = &unhashed_streams;
 926         root_dentry = NULL;
 927
 928         params.lookup_table = w->lookup_table;
 929         params.inode_table = &inode_table;
 930         params.sd_set = &sd_set;
 931         params.config = config;
 932         params.add_image_flags = add_image_flags;
 933         params.progress_func = progress_func;
 934         params.extra_arg = extra_arg;
 935         for (size_t i = 0; i < num_sources; i++) {
 936                 int flags;
 937                 union wimlib_progress_info progress;
 938
 939                 DEBUG("Building dentry tree for source %zu of %zu "
 940                       "(\"%"TS"\" => \"%"TS"\")", i + 1, num_sources,
 941                       sources[i].fs_source_path,
 942                       sources[i].wim_target_path);
 943                 if (progress_func) {
 944                         memset(&progress, 0, sizeof(progress));
 945                         progress.scan.source = sources[i].fs_source_path;
 946                         progress.scan.wim_target_path = sources[i].wim_target_path;
 947                         progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &progress);
 948                 }
 949                 config->_prefix = sources[i].fs_source_path;
 950                 config->_prefix_num_tchars = tstrlen(sources[i].fs_source_path);
 951                 flags = add_image_flags | WIMLIB_ADD_IMAGE_FLAG_SOURCE;
 952                 if (!*sources[i].wim_target_path)
 953                         flags |= WIMLIB_ADD_IMAGE_FLAG_ROOT;
 954                 ret = (*capture_tree)(&branch, sources[i].fs_source_path,
 955                                       &params);
 956                 if (ret) {
 957                         ERROR("Failed to build dentry tree for `%"TS"'",
 958                               sources[i].fs_source_path);
 959                         goto out_free_dentry_tree;
 960                 }
 961                 if (branch) {
 962                         /* Use the target name, not the source name, for
 963                          * the root of each branch from a capture
 964                          * source.  (This will also set the root dentry
 965                          * of the entire image to be unnamed.) */
 966                         ret = set_dentry_name(branch,
 967                                               path_basename(sources[i].wim_target_path));
 968                         if (ret)
 969                                 goto out_free_branch;
 970
 971                         ret = attach_branch(&root_dentry, branch,
 972                                             sources[i].wim_target_path);
 973                         if (ret)
 974                                 goto out_free_branch;
 975                 }
 976                 if (progress_func)
 977                         progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &progress);
 978         }
 979
 980         if (root_dentry == NULL) {
 981                 ret = new_filler_directory(T(""), &root_dentry);
 982                 if (ret)
 983                         goto out_free_dentry_tree;
 984         }
 985
 986         ret = add_new_dentry_tree(w, root_dentry, sd);
 987
 988         if (ret) {
 989 #ifdef WITH_NTFS_3G
 990                 if (ntfs_vol)
 991                         do_ntfs_umount(ntfs_vol);
 992 #endif
 993                 goto out_free_dentry_tree;
 994         }
 995
 996         imd = w->image_metadata[w->hdr.image_count - 1];
 997         list_transfer(&unhashed_streams, &imd->unhashed_streams);
 998
 999 #ifdef WITH_NTFS_3G
1000         imd->ntfs_vol = ntfs_vol;
1001 #endif
1002
1003         DEBUG("Assigning hard link group IDs");
1004         inode_table_prepare_inode_list(&inode_table, &imd->inode_list);
1005
1006         ret = xml_add_image(w, name);
1007         if (ret)
1008                 goto out_put_imd;
1009
1010         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_BOOT)
1011                 wimlib_set_boot_idx(w, w->hdr.image_count);
1012
1013         if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_RPFIX)
1014                 w->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
1015
1016         ret = 0;
1017         goto out_destroy_inode_table;
1018 out_put_imd:
1019         put_image_metadata(w->image_metadata[--w->hdr.image_count],
1020                            w->lookup_table);
1021         goto out_destroy_inode_table;
1022 out_free_branch:
1023         free_dentry_tree(branch, w->lookup_table);
1024 out_free_dentry_tree:
1025         free_dentry_tree(root_dentry, w->lookup_table);
1026 out_free_security_data:
1027         free_security_data(sd);
1028 out_destroy_inode_table:
1029         destroy_inode_table(&inode_table);
1030         destroy_sd_set(&sd_set);
1031 out:
1032         return ret;
1033 }
1034
1035 WIMLIBAPI int
1036 wimlib_add_image(WIMStruct *w,
1037                  const tchar *source,
1038                  const tchar *name,
1039                  struct wimlib_capture_config *config,
1040                  int add_image_flags,
1041                  wimlib_progress_func_t progress_func)
1042 {
1043         if (!source || !*source)
1044                 return WIMLIB_ERR_INVALID_PARAM;
1045
1046         tchar *fs_source_path = TSTRDUP(source);
1047         int ret;
1048         struct wimlib_capture_source capture_src = {
1049                 .fs_source_path = fs_source_path,
1050                 .wim_target_path = NULL,
1051                 .reserved = 0,
1052         };
1053         ret = wimlib_add_image_multisource(w, &capture_src, 1, name,
1054                                            config, add_image_flags,
1055                                            progress_func);
1056         FREE(fs_source_path);
1057         return ret;
1058 }