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

   1 /*
   2  * update_image.c - Update a WIM image.
   3  */
   4
   5 /*
   6  * Copyright (C) 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 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include "wimlib/capture.h"
  29 #include "wimlib/dentry.h"
  30 #include "wimlib/error.h"
  31 #include "wimlib/lookup_table.h"
  32 #include "wimlib/metadata.h"
  33 #ifdef WITH_NTFS_3G
  34 #  include "wimlib/ntfs_3g.h" /* for do_ntfs_umount() */
  35 #endif
  36 #include "wimlib/paths.h"
  37 #include "wimlib/xml.h"
  38
  39 #include <errno.h>
  40
  41 /* Overlays @branch onto @target, both of which must be directories. */
  42 static int
  43 do_overlay(struct wim_dentry *target, struct wim_dentry *branch)
  44 {
  45         DEBUG("Doing overlay \"%"WS"\" => \"%"WS"\"",
  46               branch->file_name, target->file_name);
  47
  48         if (!dentry_is_directory(branch) || !dentry_is_directory(target)) {
  49                 ERROR("Cannot overlay \"%"WS"\" onto existing dentry: "
  50                       "is not directory-on-directory!", branch->file_name);
  51                 return WIMLIB_ERR_INVALID_OVERLAY;
  52         }
  53
  54         LIST_HEAD(moved_children);
  55         while (dentry_has_children(branch)) {
  56                 struct wim_dentry *child = dentry_any_child(branch);
  57                 struct wim_dentry *existing;
  58
  59                 /* Move @child to the directory @target */
  60                 unlink_dentry(child);
  61                 existing = dentry_add_child(target, child);
  62
  63                 /* File or directory with same name already exists */
  64                 if (existing) {
  65                         int ret;
  66                         ret = do_overlay(existing, child);
  67                         if (ret) {
  68                                 /* Overlay failed.  Revert the changes. */
  69                                 dentry_add_child(branch, child);
  70                                 list_for_each_entry(child, &moved_children, tmp_list)
  71                                 {
  72                                         unlink_dentry(child);
  73                                         dentry_add_child(branch, child);
  74                                 }
  75                                 return ret;
  76                         }
  77                 } else {
  78                         list_add(&child->tmp_list, &moved_children);
  79                 }
  80         }
  81         free_dentry(branch);
  82         return 0;
  83 }
  84
  85 /* Attach or overlay a branch onto the WIM image.
  86  *
  87  * @root_p:
  88  *      Pointer to the root of the WIM image, or pointer to NULL if it has not
  89  *      been created yet.
  90  * @branch
  91  *      Branch to add.
  92  * @target_path:
  93  *      Path in the WIM image to add the branch, with leading and trailing
  94  *      slashes stripped.
  95  */
  96 static int
  97 attach_branch(struct wim_dentry **root_p, struct wim_dentry *branch,
  98               tchar *target_path, CASE_SENSITIVITY_TYPE case_type)
  99 {
 100         tchar *slash;
 101         struct wim_dentry *dentry, *parent, *target;
 102         int ret;
 103
 104         DEBUG("Attaching branch \"%"WS"\" => \"%"TS"\"",
 105               branch->file_name, target_path);
 106
 107         if (*target_path == T('\0')) {
 108                 /* Target: root directory */
 109                 if (*root_p) {
 110                         /* Overlay on existing root */
 111                         return do_overlay(*root_p, branch);
 112                 } else {
 113                         if (!dentry_is_directory(branch)) {
 114                                 ERROR("Cannot set non-directory as root of WIM image");
 115                                 return WIMLIB_ERR_NOTDIR;
 116                         }
 117                         /* Set as root */
 118                         *root_p = branch;
 119                         return 0;
 120                 }
 121         }
 122
 123         /* Adding a non-root branch.  Create root if it hasn't been created
 124          * already. */
 125         if (!*root_p) {
 126                 ret  = new_filler_directory(T(""), root_p);
 127                 if (ret)
 128                         return ret;
 129         }
 130
 131         /* Walk the path to the branch, creating filler directories as needed.
 132          * */
 133         parent = *root_p;
 134         while ((slash = tstrchr(target_path, WIM_PATH_SEPARATOR))) {
 135                 *slash = T('\0');
 136                 dentry = get_dentry_child_with_name(parent, target_path,
 137                                                     case_type);
 138                 if (!dentry) {
 139                         ret = new_filler_directory(target_path, &dentry);
 140                         if (ret)
 141                                 return ret;
 142                         dentry_add_child(parent, dentry);
 143                 }
 144                 parent = dentry;
 145                 target_path = slash;
 146                 /* Skip over slashes.  Note: this cannot overrun the length of
 147                  * the string because the last character cannot be a slash, as
 148                  * trailing slashes were tripped.  */
 149                 do {
 150                         ++target_path;
 151                 } while (*target_path == WIM_PATH_SEPARATOR);
 152         }
 153
 154         /* If the target path already existed, overlay the branch onto it.
 155          * Otherwise, set the branch as the target path. */
 156         target = get_dentry_child_with_utf16le_name(parent, branch->file_name,
 157                                                     branch->file_name_nbytes,
 158                                                     case_type);
 159         if (target) {
 160                 return do_overlay(target, branch);
 161         } else {
 162                 dentry_add_child(parent, branch);
 163                 return 0;
 164         }
 165 }
 166
 167 static int
 168 execute_add_command(WIMStruct *wim,
 169                     const struct wimlib_update_command *add_cmd,
 170                     wimlib_progress_func_t progress_func)
 171 {
 172         int ret;
 173         int add_flags;
 174         tchar *fs_source_path;
 175         tchar *wim_target_path;
 176         struct wim_image_metadata *imd;
 177         struct list_head unhashed_streams;
 178         struct add_image_params params;
 179         int (*capture_tree)(struct wim_dentry **,
 180                             const tchar *,
 181                             struct add_image_params *);
 182         struct wimlib_capture_config *config;
 183 #ifdef WITH_NTFS_3G
 184         struct _ntfs_volume *ntfs_vol = NULL;
 185 #endif
 186         void *extra_arg;
 187         struct wim_dentry *branch;
 188         bool rollback_sd = true;
 189
 190         wimlib_assert(add_cmd->op == WIMLIB_UPDATE_OP_ADD);
 191
 192         add_flags = add_cmd->add.add_flags;
 193         fs_source_path = add_cmd->add.fs_source_path;
 194         wim_target_path = add_cmd->add.wim_target_path;
 195         config = add_cmd->add.config;
 196         DEBUG("fs_source_path=\"%"TS"\", wim_target_path=\"%"TS"\", add_flags=%#x",
 197               fs_source_path, wim_target_path, add_flags);
 198
 199         memset(&params, 0, sizeof(params));
 200
 201         imd = wim->image_metadata[wim->current_image - 1];
 202
 203         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 204         #ifdef WITH_NTFS_3G
 205                 capture_tree = build_dentry_tree_ntfs;
 206                 extra_arg = &ntfs_vol;
 207                 if (imd->ntfs_vol != NULL) {
 208                         ERROR("NTFS volume already set");
 209                         ret = WIMLIB_ERR_INVALID_PARAM;
 210                         goto out;
 211                 }
 212         #else
 213                 ret = WIMLIB_ERR_INVALID_PARAM;
 214                 goto out;
 215         #endif
 216         } else {
 217         #ifdef __WIN32__
 218                 capture_tree = win32_build_dentry_tree;
 219         #else
 220                 capture_tree = unix_build_dentry_tree;
 221         #endif
 222                 extra_arg = NULL;
 223         }
 224
 225
 226         ret = init_inode_table(&params.inode_table, 9001);
 227         if (ret)
 228                 goto out;
 229
 230         ret = init_sd_set(&params.sd_set, imd->security_data);
 231         if (ret)
 232                 goto out_destroy_inode_table;
 233
 234         INIT_LIST_HEAD(&unhashed_streams);
 235         params.lookup_table = wim->lookup_table;
 236         params.unhashed_streams = &unhashed_streams;
 237         params.config = config;
 238         params.add_flags = add_flags;
 239         params.extra_arg = extra_arg;
 240
 241         params.progress_func = progress_func;
 242         params.progress.scan.source = fs_source_path;
 243         params.progress.scan.wim_target_path = wim_target_path;
 244         if (progress_func)
 245                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &params.progress);
 246         if (config) {
 247                 config->_prefix = fs_source_path;
 248                 config->_prefix_num_tchars = tstrlen(fs_source_path);
 249         }
 250
 251         if (wim_target_path[0] == T('\0'))
 252                 params.add_flags |= WIMLIB_ADD_FLAG_ROOT;
 253         ret = (*capture_tree)(&branch, fs_source_path, &params);
 254         if (ret)
 255                 goto out_destroy_sd_set;
 256
 257         if (branch) {
 258                 /* Use the target name, not the source name, for
 259                  * the root of each branch from a capture
 260                  * source.  (This will also set the root dentry
 261                  * of the entire image to be unnamed.) */
 262                 ret = dentry_set_name(branch,
 263                                       path_basename(wim_target_path));
 264                 if (ret)
 265                         goto out_ntfs_umount;
 266
 267                 ret = attach_branch(&imd->root_dentry, branch, wim_target_path,
 268                                     WIMLIB_CASE_PLATFORM_DEFAULT);
 269                 if (ret)
 270                         goto out_ntfs_umount;
 271         }
 272         if (progress_func)
 273                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &params.progress);
 274         list_splice_tail(&unhashed_streams, &imd->unhashed_streams);
 275 #ifdef WITH_NTFS_3G
 276         imd->ntfs_vol = ntfs_vol;
 277 #endif
 278         inode_table_prepare_inode_list(&params.inode_table, &imd->inode_list);
 279         ret = 0;
 280         rollback_sd = false;
 281         if (add_flags & WIMLIB_ADD_FLAG_RPFIX)
 282                 wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 283         goto out_destroy_sd_set;
 284 out_ntfs_umount:
 285 #ifdef WITH_NTFS_3G
 286         if (ntfs_vol)
 287                 do_ntfs_umount(ntfs_vol);
 288 #endif
 289         free_dentry_tree(branch, wim->lookup_table);
 290 out_destroy_sd_set:
 291         destroy_sd_set(&params.sd_set, rollback_sd);
 292 out_destroy_inode_table:
 293         destroy_inode_table(&params.inode_table);
 294 out:
 295         return ret;
 296 }
 297
 298 static int
 299 execute_delete_command(WIMStruct *wim,
 300                        const struct wimlib_update_command *delete_cmd)
 301 {
 302         int flags;
 303         const tchar *wim_path;
 304         struct wim_dentry *tree;
 305         bool is_root;
 306
 307         wimlib_assert(delete_cmd->op == WIMLIB_UPDATE_OP_DELETE);
 308         flags = delete_cmd->delete_.delete_flags;
 309         wim_path = delete_cmd->delete_.wim_path;
 310
 311         DEBUG("Deleting WIM path \"%"TS"\" (flags=%#x)", wim_path, flags);
 312
 313         tree = get_dentry(wim, wim_path, WIMLIB_CASE_PLATFORM_DEFAULT);
 314         if (!tree) {
 315                 /* Path to delete does not exist in the WIM. */
 316                 if (flags & WIMLIB_DELETE_FLAG_FORCE) {
 317                         return 0;
 318                 } else {
 319                         ERROR("Path \"%"TS"\" does not exist in WIM image %d",
 320                               wim_path, wim->current_image);
 321                         return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 322                 }
 323         }
 324
 325         if (dentry_is_directory(tree) && !(flags & WIMLIB_DELETE_FLAG_RECURSIVE)) {
 326                 ERROR("Path \"%"TS"\" in WIM image %d is a directory "
 327                       "but a recursive delete was not requested",
 328                       wim_path, wim->current_image);
 329                 return WIMLIB_ERR_IS_DIRECTORY;
 330         }
 331
 332         is_root = dentry_is_root(tree);
 333         unlink_dentry(tree);
 334         free_dentry_tree(tree, wim->lookup_table);
 335         if (is_root)
 336                 wim->image_metadata[wim->current_image - 1]->root_dentry = NULL;
 337         return 0;
 338 }
 339
 340 static int
 341 execute_rename_command(WIMStruct *wim,
 342                        const struct wimlib_update_command *rename_cmd)
 343 {
 344         int ret;
 345
 346         wimlib_assert(rename_cmd->op == WIMLIB_UPDATE_OP_RENAME);
 347
 348         ret = rename_wim_path(wim, rename_cmd->rename.wim_source_path,
 349                               rename_cmd->rename.wim_target_path,
 350                               WIMLIB_CASE_PLATFORM_DEFAULT);
 351         if (ret) {
 352                 ret = -ret;
 353                 errno = ret;
 354                 ERROR_WITH_ERRNO("Can't rename \"%"TS"\" to \"%"TS"\"",
 355                                  rename_cmd->rename.wim_source_path,
 356                                  rename_cmd->rename.wim_target_path);
 357                 switch (ret) {
 358                 case ENOMEM:
 359                         ret = WIMLIB_ERR_NOMEM;
 360                         break;
 361                 case ENOTDIR:
 362                         ret = WIMLIB_ERR_NOTDIR;
 363                         break;
 364                 case ENOTEMPTY:
 365                         ret = WIMLIB_ERR_NOTEMPTY;
 366                         break;
 367                 case EISDIR:
 368                         ret = WIMLIB_ERR_IS_DIRECTORY;
 369                         break;
 370                 case ENOENT:
 371                 default:
 372                         ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 373                         break;
 374                 }
 375         }
 376         return ret;
 377 }
 378
 379 static inline const tchar *
 380 update_op_to_str(int op)
 381 {
 382         switch (op) {
 383         case WIMLIB_UPDATE_OP_ADD:
 384                 return T("add");
 385         case WIMLIB_UPDATE_OP_DELETE:
 386                 return T("delete");
 387         case WIMLIB_UPDATE_OP_RENAME:
 388                 return T("rename");
 389         default:
 390                 wimlib_assert(0);
 391                 return NULL;
 392         }
 393 }
 394
 395 static int
 396 execute_update_commands(WIMStruct *wim,
 397                         const struct wimlib_update_command *cmds,
 398                         size_t num_cmds,
 399                         int update_flags,
 400                         wimlib_progress_func_t progress_func)
 401 {
 402         int ret = 0;
 403         union wimlib_progress_info info;
 404         info.update.completed_commands = 0;
 405         info.update.total_commands = num_cmds;
 406         for (size_t i = 0; i < num_cmds; i++) {
 407                 DEBUG("Executing update command %zu of %zu (op=%"TS")",
 408                       i + 1, num_cmds, update_op_to_str(cmds[i].op));
 409                 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
 410                     progress_func)
 411                 {
 412                         info.update.command = &cmds[i];
 413                         (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_BEGIN_COMMAND,
 414                                          &info);
 415                 }
 416                 switch (cmds[i].op) {
 417                 case WIMLIB_UPDATE_OP_ADD:
 418                         ret = execute_add_command(wim, &cmds[i], progress_func);
 419                         break;
 420                 case WIMLIB_UPDATE_OP_DELETE:
 421                         ret = execute_delete_command(wim, &cmds[i]);
 422                         break;
 423                 case WIMLIB_UPDATE_OP_RENAME:
 424                         ret = execute_rename_command(wim, &cmds[i]);
 425                         break;
 426                 default:
 427                         wimlib_assert(0);
 428                 }
 429                 if (ret)
 430                         break;
 431                 info.update.completed_commands++;
 432                 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
 433                     progress_func)
 434                 {
 435                         (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_END_COMMAND,
 436                                          &info);
 437                 }
 438         }
 439         return ret;
 440 }
 441
 442
 443 tchar *winpats[] = {
 444         T("/$ntfs.log"),
 445         T("/hiberfil.sys"),
 446         T("/pagefile.sys"),
 447         T("/System Volume Information"),
 448         T("/RECYCLER"),
 449         T("/Windows/CSC"),
 450 };
 451
 452 static const struct wimlib_capture_config winconfig = {
 453         .exclusion_pats = {
 454                 .num_pats = ARRAY_LEN(winpats),
 455                 .pats = winpats,
 456         },
 457 };
 458
 459 static int
 460 check_add_command(struct wimlib_update_command *cmd,
 461                   const struct wim_header *hdr)
 462 {
 463         int add_flags = cmd->add.add_flags;
 464
 465         if (add_flags & ~(WIMLIB_ADD_FLAG_NTFS |
 466                           WIMLIB_ADD_FLAG_DEREFERENCE |
 467                           WIMLIB_ADD_FLAG_VERBOSE |
 468                           /* BOOT doesn't make sense for wimlib_update_image().
 469                            * Same with WIMBOOT.  */
 470                           /*WIMLIB_ADD_FLAG_BOOT |*/
 471                           /*WIMLIB_ADD_FLAG_WIMBOOT |*/
 472                           WIMLIB_ADD_FLAG_UNIX_DATA |
 473                           WIMLIB_ADD_FLAG_NO_ACLS |
 474                           WIMLIB_ADD_FLAG_STRICT_ACLS |
 475                           WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE |
 476                           WIMLIB_ADD_FLAG_RPFIX |
 477                           WIMLIB_ADD_FLAG_NORPFIX |
 478                           WIMLIB_ADD_FLAG_NO_UNSUPPORTED_EXCLUDE |
 479                           WIMLIB_ADD_FLAG_WINCONFIG))
 480                 return WIMLIB_ERR_INVALID_PARAM;
 481
 482         /* Are we adding the entire image or not?  An empty wim_target_path
 483          * indicates that the tree we're adding is to be placed in the root of
 484          * the image.  We consider this to be capturing the entire image,
 485          * although it could potentially be an overlay on an existing root as
 486          * well. */
 487         bool is_entire_image = cmd->add.wim_target_path[0] == T('\0');
 488
 489 #ifdef __WIN32__
 490         /* Check for flags not supported on Windows */
 491         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 492                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 493                 ERROR("we cannot capture a WIM image directly from a NTFS volume");
 494                 return WIMLIB_ERR_UNSUPPORTED;
 495         }
 496         if (add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
 497                 ERROR("Capturing UNIX-specific data is not supported on Windows");
 498                 return WIMLIB_ERR_UNSUPPORTED;
 499         }
 500         if (add_flags & WIMLIB_ADD_FLAG_DEREFERENCE) {
 501                 ERROR("Dereferencing symbolic links is not supported on Windows");
 502                 return WIMLIB_ERR_UNSUPPORTED;
 503         }
 504 #endif
 505
 506         /* VERBOSE implies EXCLUDE_VERBOSE */
 507         if (add_flags & WIMLIB_ADD_FLAG_VERBOSE)
 508                 add_flags |= WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE;
 509
 510         /* Check for contradictory reparse point fixup flags */
 511         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 512                           WIMLIB_ADD_FLAG_NORPFIX)) ==
 513                 (WIMLIB_ADD_FLAG_RPFIX |
 514                  WIMLIB_ADD_FLAG_NORPFIX))
 515         {
 516                 ERROR("Cannot specify RPFIX and NORPFIX flags "
 517                       "at the same time!");
 518                 return WIMLIB_ERR_INVALID_PARAM;
 519         }
 520
 521         /* Set default behavior on reparse point fixups if requested */
 522         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 523                           WIMLIB_ADD_FLAG_NORPFIX)) == 0)
 524         {
 525                 /* Do reparse-point fixups by default if we are capturing an
 526                  * entire image and either the header flag is set from previous
 527                  * images, or if this is the first image being added. */
 528                 if (is_entire_image &&
 529                     ((hdr->flags & WIM_HDR_FLAG_RP_FIX) || hdr->image_count == 1))
 530                         add_flags |= WIMLIB_ADD_FLAG_RPFIX;
 531         }
 532
 533         if (!is_entire_image) {
 534                 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 535                         ERROR("Cannot add directly from a NTFS volume "
 536                               "when not capturing a full image!");
 537                         return WIMLIB_ERR_INVALID_PARAM;
 538                 }
 539
 540                 if (add_flags & WIMLIB_ADD_FLAG_RPFIX) {
 541                         ERROR("Cannot do reparse point fixups when "
 542                               "not capturing a full image!");
 543                         return WIMLIB_ERR_INVALID_PARAM;
 544                 }
 545         }
 546         /* We may have modified the add flags. */
 547         cmd->add.add_flags = add_flags;
 548         return 0;
 549 }
 550
 551 static int
 552 check_delete_command(const struct wimlib_update_command *cmd)
 553 {
 554         if (cmd->delete_.delete_flags & ~(WIMLIB_DELETE_FLAG_FORCE |
 555                                           WIMLIB_DELETE_FLAG_RECURSIVE))
 556                 return WIMLIB_ERR_INVALID_PARAM;
 557         return 0;
 558 }
 559
 560 static int
 561 check_rename_command(const struct wimlib_update_command *cmd)
 562 {
 563         if (cmd->rename.rename_flags != 0)
 564                 return WIMLIB_ERR_INVALID_PARAM;
 565         return 0;
 566 }
 567
 568 static int
 569 check_update_command(struct wimlib_update_command *cmd,
 570                      const struct wim_header *hdr)
 571 {
 572         switch (cmd->op) {
 573         case WIMLIB_UPDATE_OP_ADD:
 574                 return check_add_command(cmd, hdr);
 575         case WIMLIB_UPDATE_OP_DELETE:
 576                 return check_delete_command(cmd);
 577         case WIMLIB_UPDATE_OP_RENAME:
 578                 return check_rename_command(cmd);
 579         }
 580         return 0;
 581 }
 582
 583 static int
 584 check_update_commands(struct wimlib_update_command *cmds, size_t num_cmds,
 585                       const struct wim_header *hdr)
 586 {
 587         int ret = 0;
 588         for (size_t i = 0; i < num_cmds; i++) {
 589                 ret = check_update_command(&cmds[i], hdr);
 590                 if (ret)
 591                         break;
 592         }
 593         return ret;
 594 }
 595
 596
 597 static void
 598 free_update_commands(struct wimlib_update_command *cmds, size_t num_cmds)
 599 {
 600         if (cmds) {
 601                 for (size_t i = 0; i < num_cmds; i++) {
 602                         switch (cmds[i].op) {
 603                         case WIMLIB_UPDATE_OP_ADD:
 604                                 FREE(cmds[i].add.fs_source_path);
 605                                 FREE(cmds[i].add.wim_target_path);
 606                                 free_capture_config(cmds[i].add.config);
 607                                 break;
 608                         case WIMLIB_UPDATE_OP_DELETE:
 609                                 FREE(cmds[i].delete_.wim_path);
 610                                 break;
 611                         case WIMLIB_UPDATE_OP_RENAME:
 612                                 FREE(cmds[i].rename.wim_source_path);
 613                                 FREE(cmds[i].rename.wim_target_path);
 614                                 break;
 615                         }
 616                 }
 617                 FREE(cmds);
 618         }
 619 }
 620
 621 static int
 622 copy_update_commands(const struct wimlib_update_command *cmds,
 623                      size_t num_cmds,
 624                      struct wimlib_update_command **cmds_copy_ret)
 625 {
 626         int ret;
 627         struct wimlib_update_command *cmds_copy;
 628         const struct wimlib_capture_config *config;
 629
 630         cmds_copy = CALLOC(num_cmds, sizeof(cmds[0]));
 631         if (!cmds_copy)
 632                 goto oom;
 633
 634         for (size_t i = 0; i < num_cmds; i++) {
 635                 cmds_copy[i].op = cmds[i].op;
 636                 switch (cmds[i].op) {
 637                 case WIMLIB_UPDATE_OP_ADD:
 638                         cmds_copy[i].add.fs_source_path =
 639                                 canonicalize_fs_path(cmds[i].add.fs_source_path);
 640                         cmds_copy[i].add.wim_target_path =
 641                                 canonicalize_wim_path(cmds[i].add.wim_target_path);
 642                         if (!cmds_copy[i].add.fs_source_path ||
 643                             !cmds_copy[i].add.wim_target_path)
 644                                 goto oom;
 645                         config = cmds[i].add.config;
 646                         if (cmds[i].add.add_flags & WIMLIB_ADD_FLAG_WINCONFIG)
 647                                 config = &winconfig;
 648                         if (config) {
 649                                 ret = copy_and_canonicalize_capture_config(config,
 650                                                                            &cmds_copy[i].add.config);
 651                                 if (ret)
 652                                         goto err;
 653                         }
 654                         cmds_copy[i].add.add_flags = cmds[i].add.add_flags;
 655                         break;
 656                 case WIMLIB_UPDATE_OP_DELETE:
 657                         cmds_copy[i].delete_.wim_path =
 658                                 canonicalize_wim_path(cmds[i].delete_.wim_path);
 659                         if (!cmds_copy[i].delete_.wim_path)
 660                                 goto oom;
 661                         cmds_copy[i].delete_.delete_flags = cmds[i].delete_.delete_flags;
 662                         break;
 663                 case WIMLIB_UPDATE_OP_RENAME:
 664                         cmds_copy[i].rename.wim_source_path =
 665                                 canonicalize_wim_path(cmds[i].rename.wim_source_path);
 666                         cmds_copy[i].rename.wim_target_path =
 667                                 canonicalize_wim_path(cmds[i].rename.wim_target_path);
 668                         if (!cmds_copy[i].rename.wim_source_path ||
 669                             !cmds_copy[i].rename.wim_target_path)
 670                                 goto oom;
 671                         break;
 672                 default:
 673                         ERROR("Unknown update operation %u", cmds[i].op);
 674                         ret = WIMLIB_ERR_INVALID_PARAM;
 675                         goto err;
 676                 }
 677         }
 678         *cmds_copy_ret = cmds_copy;
 679         ret = 0;
 680 out:
 681         return ret;
 682 oom:
 683         ret = WIMLIB_ERR_NOMEM;
 684 err:
 685         free_update_commands(cmds_copy, num_cmds);
 686         goto out;
 687 }
 688
 689 /* API function documented in wimlib.h  */
 690 WIMLIBAPI int
 691 wimlib_update_image(WIMStruct *wim,
 692                     int image,
 693                     const struct wimlib_update_command *cmds,
 694                     size_t num_cmds,
 695                     int update_flags,
 696                     wimlib_progress_func_t progress_func)
 697 {
 698         int ret;
 699         struct wimlib_update_command *cmds_copy;
 700         bool deletion_requested = false;
 701
 702         if (update_flags & ~WIMLIB_UPDATE_FLAG_SEND_PROGRESS)
 703                 return WIMLIB_ERR_INVALID_PARAM;
 704
 705         DEBUG("Updating image %d with %zu commands", image, num_cmds);
 706
 707         for (size_t i = 0; i < num_cmds; i++)
 708                 if (cmds[i].op == WIMLIB_UPDATE_OP_DELETE)
 709                         deletion_requested = true;
 710
 711         if (deletion_requested)
 712                 ret = can_delete_from_wim(wim);
 713         else
 714                 ret = can_modify_wim(wim);
 715
 716         if (ret)
 717                 goto out;
 718
 719         /* Load the metadata for the image to modify (if not loaded already) */
 720         ret = select_wim_image(wim, image);
 721         if (ret)
 722                 goto out;
 723
 724         /* Short circuit a successful return if no commands were specified.
 725          * Avoids problems with trying to allocate 0 bytes of memory. */
 726         if (num_cmds == 0)
 727                 goto out;
 728
 729         DEBUG("Preparing %zu update commands", num_cmds);
 730
 731         /* Make a copy of the update commands, in the process doing certain
 732          * canonicalizations on paths (e.g. translating backslashes to forward
 733          * slashes).  This is done to avoid modifying the caller's copy of the
 734          * commands. */
 735         ret = copy_update_commands(cmds, num_cmds, &cmds_copy);
 736         if (ret)
 737                 goto out;
 738
 739         /* Perform additional checks on the update commands before we execute
 740          * them. */
 741         ret = check_update_commands(cmds_copy, num_cmds, &wim->hdr);
 742         if (ret)
 743                 goto out_free_cmds_copy;
 744
 745         /* Actually execute the update commands. */
 746         DEBUG("Executing %zu update commands", num_cmds);
 747         ret = execute_update_commands(wim, cmds_copy, num_cmds, update_flags,
 748                                       progress_func);
 749         if (ret)
 750                 goto out_free_cmds_copy;
 751
 752         wim->image_metadata[image - 1]->modified = 1;
 753
 754         /* Statistics about the WIM image, such as the numbers of files and
 755          * directories, may have changed.  Call xml_update_image_info() to
 756          * recalculate these statistics. */
 757         xml_update_image_info(wim, image);
 758 out_free_cmds_copy:
 759         free_update_commands(cmds_copy, num_cmds);
 760 out:
 761         return ret;
 762 }