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 #include "wimlib_internal.h"
  25 #include "dentry.h"
  26 #include "lookup_table.h"
  27 #include "security.h"
  28 #include "xml.h"
  29 #include <errno.h>
  30
  31 #ifdef __WIN32__
  32 #  include "win32.h"
  33 #endif
  34
  35 /* Overlays @branch onto @target, both of which must be directories. */
  36 static int
  37 do_overlay(struct wim_dentry *target, struct wim_dentry *branch)
  38 {
  39         struct rb_root *rb_root;
  40
  41         DEBUG("Doing overlay \"%"WS"\" => \"%"WS"\"",
  42               branch->file_name, target->file_name);
  43
  44         if (!dentry_is_directory(branch) || !dentry_is_directory(target)) {
  45                 ERROR("Cannot overlay \"%"WS"\" onto existing dentry: "
  46                       "is not directory-on-directory!", branch->file_name);
  47                 return WIMLIB_ERR_INVALID_OVERLAY;
  48         }
  49
  50         rb_root = &branch->d_inode->i_children;
  51         LIST_HEAD(moved_children);
  52         while (rb_root->rb_node) { /* While @branch has children... */
  53                 struct wim_dentry *child = rbnode_dentry(rb_root->rb_node);
  54                 struct wim_dentry *existing;
  55
  56                 /* Move @child to the directory @target */
  57                 unlink_dentry(child);
  58                 existing = dentry_add_child(target, child);
  59
  60                 /* File or directory with same name already exists */
  61                 if (existing) {
  62                         int ret;
  63                         ret = do_overlay(existing, child);
  64                         if (ret) {
  65                                 /* Overlay failed.  Revert the changes. */
  66                                 dentry_add_child(branch, child);
  67                                 list_for_each_entry(child, &moved_children, tmp_list)
  68                                 {
  69                                         unlink_dentry(child);
  70                                         dentry_add_child(branch, child);
  71                                 }
  72                                 return ret;
  73                         }
  74                 } else {
  75                         list_add(&child->tmp_list, &moved_children);
  76                 }
  77         }
  78         free_dentry(branch);
  79         return 0;
  80 }
  81
  82 /* Attach or overlay a branch onto the WIM image.
  83  *
  84  * @root_p:
  85  *      Pointer to the root of the WIM image, or pointer to NULL if it has not
  86  *      been created yet.
  87  * @branch
  88  *      Branch to add.
  89  * @target_path:
  90  *      Path in the WIM image to add the branch, with leading and trailing
  91  *      slashes stripped.
  92  */
  93 static int
  94 attach_branch(struct wim_dentry **root_p, struct wim_dentry *branch,
  95               tchar *target_path)
  96 {
  97         tchar *slash;
  98         struct wim_dentry *dentry, *parent, *target;
  99         int ret;
 100
 101         DEBUG("Attaching branch \"%"WS"\" => \"%"TS"\"",
 102               branch->file_name, target_path);
 103
 104         if (*target_path == T('\0')) {
 105                 /* Target: root directory */
 106                 if (*root_p) {
 107                         /* Overlay on existing root */
 108                         return do_overlay(*root_p, branch);
 109                 } else {
 110                         if (!dentry_is_directory(branch)) {
 111                                 ERROR("Cannot set non-directory as root of WIM image");
 112                                 return WIMLIB_ERR_NOTDIR;
 113                         }
 114                         /* Set as root */
 115                         *root_p = branch;
 116                         return 0;
 117                 }
 118         }
 119
 120         /* Adding a non-root branch.  Create root if it hasn't been created
 121          * already. */
 122         if (!*root_p) {
 123                 ret  = new_filler_directory(T(""), root_p);
 124                 if (ret)
 125                         return ret;
 126         }
 127
 128         /* Walk the path to the branch, creating filler directories as needed.
 129          * */
 130         parent = *root_p;
 131         while ((slash = tstrchr(target_path, T('/')))) {
 132                 *slash = T('\0');
 133                 dentry = get_dentry_child_with_name(parent, target_path);
 134                 if (!dentry) {
 135                         ret = new_filler_directory(target_path, &dentry);
 136                         if (ret)
 137                                 return ret;
 138                         dentry_add_child(parent, dentry);
 139                 }
 140                 parent = dentry;
 141                 target_path = slash;
 142                 /* Skip over slashes.  Note: this cannot overrun the length of
 143                  * the string because the last character cannot be a slash, as
 144                  * trailing slashes were tripped.  */
 145                 do {
 146                         ++target_path;
 147                 } while (*target_path == T('/'));
 148         }
 149
 150         /* If the target path already existed, overlay the branch onto it.
 151          * Otherwise, set the branch as the target path. */
 152         target = get_dentry_child_with_utf16le_name(parent, branch->file_name,
 153                                                     branch->file_name_nbytes);
 154         if (target) {
 155                 return do_overlay(target, branch);
 156         } else {
 157                 dentry_add_child(parent, branch);
 158                 return 0;
 159         }
 160 }
 161
 162 static int
 163 execute_add_command(WIMStruct *wim,
 164                     const struct wimlib_update_command *add_cmd,
 165                     wimlib_progress_func_t progress_func)
 166 {
 167         int ret;
 168         int add_flags;
 169         tchar *fs_source_path;
 170         tchar *wim_target_path;
 171         struct wim_inode_table inode_table;
 172         struct sd_set sd_set;
 173         struct wim_image_metadata *imd;
 174         struct list_head unhashed_streams;
 175         struct add_image_params params;
 176         int (*capture_tree)(struct wim_dentry **,
 177                             const tchar *,
 178                             struct add_image_params *);
 179         union wimlib_progress_info progress;
 180         struct wimlib_capture_config *config;
 181 #ifdef WITH_NTFS_3G
 182         struct _ntfs_volume *ntfs_vol = NULL;
 183 #endif
 184         void *extra_arg;
 185         struct wim_dentry *branch;
 186         bool rollback_sd = true;
 187
 188         wimlib_assert(add_cmd->op == WIMLIB_UPDATE_OP_ADD);
 189         add_flags = add_cmd->add.add_flags;
 190         fs_source_path = add_cmd->add.fs_source_path;
 191         wim_target_path = add_cmd->add.wim_target_path;
 192         config = add_cmd->add.config;
 193         DEBUG("fs_source_path=\"%"TS"\", wim_target_path=\"%"TS"\", add_flags=%#x",
 194               fs_source_path, wim_target_path, add_flags);
 195
 196         imd = wim->image_metadata[wim->current_image - 1];
 197
 198         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 199         #ifdef WITH_NTFS_3G
 200                 capture_tree = build_dentry_tree_ntfs;
 201                 extra_arg = &ntfs_vol;
 202                 if (imd->ntfs_vol != NULL) {
 203                         ERROR("NTFS volume already set");
 204                         ret = WIMLIB_ERR_INVALID_PARAM;
 205                         goto out;
 206                 }
 207         #else
 208                 ret = WIMLIB_ERR_INVALID_PARAM;
 209                 goto out;
 210         #endif
 211         } else {
 212         #ifdef __WIN32__
 213                 capture_tree = win32_build_dentry_tree;
 214         #else
 215                 capture_tree = unix_build_dentry_tree;
 216         #endif
 217                 extra_arg = NULL;
 218         }
 219
 220         ret = init_inode_table(&inode_table, 9001);
 221         if (ret)
 222                 goto out;
 223
 224         ret = init_sd_set(&sd_set, imd->security_data);
 225         if (ret)
 226                 goto out_destroy_inode_table;
 227
 228         INIT_LIST_HEAD(&unhashed_streams);
 229         wim->lookup_table->unhashed_streams = &unhashed_streams;
 230         params.lookup_table = wim->lookup_table;
 231         params.inode_table = &inode_table;
 232         params.sd_set = &sd_set;
 233         params.config = config;
 234         params.add_flags = add_flags;
 235         params.progress_func = progress_func;
 236         params.extra_arg = extra_arg;
 237
 238         if (progress_func) {
 239                 memset(&progress, 0, sizeof(progress));
 240                 progress.scan.source = fs_source_path;
 241                 progress.scan.wim_target_path = wim_target_path;
 242                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &progress);
 243         }
 244         config->_prefix = fs_source_path;
 245         config->_prefix_num_tchars = tstrlen(fs_source_path);
 246
 247         if (wim_target_path[0] == T('\0'))
 248                 add_flags |= WIMLIB_ADD_FLAG_ROOT;
 249         ret = (*capture_tree)(&branch, fs_source_path, &params);
 250         if (ret) {
 251                 ERROR("Failed to build dentry tree for \"%"TS"\"",
 252                       fs_source_path);
 253                 goto out_destroy_sd_set;
 254         }
 255         if (branch) {
 256                 /* Use the target name, not the source name, for
 257                  * the root of each branch from a capture
 258                  * source.  (This will also set the root dentry
 259                  * of the entire image to be unnamed.) */
 260                 ret = set_dentry_name(branch,
 261                                       path_basename(wim_target_path));
 262                 if (ret)
 263                         goto out_ntfs_umount;
 264
 265                 ret = attach_branch(&imd->root_dentry, branch, wim_target_path);
 266                 if (ret)
 267                         goto out_ntfs_umount;
 268         }
 269         if (progress_func)
 270                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &progress);
 271         list_splice_tail(&unhashed_streams, &imd->unhashed_streams);
 272 #ifdef WITH_NTFS_3G
 273         imd->ntfs_vol = ntfs_vol;
 274 #endif
 275         inode_table_prepare_inode_list(&inode_table, &imd->inode_list);
 276         ret = 0;
 277         rollback_sd = false;
 278         if (add_flags & WIMLIB_ADD_FLAG_RPFIX)
 279                 wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 280         goto out_destroy_sd_set;
 281 out_ntfs_umount:
 282 #ifdef WITH_NTFS_3G
 283         if (ntfs_vol)
 284                 do_ntfs_umount(ntfs_vol);
 285 #endif
 286         free_dentry_tree(branch, wim->lookup_table);
 287 out_destroy_sd_set:
 288         destroy_sd_set(&sd_set, rollback_sd);
 289 out_destroy_inode_table:
 290         destroy_inode_table(&inode_table);
 291 out:
 292         return ret;
 293 }
 294
 295 static int
 296 execute_delete_command(WIMStruct *wim,
 297                        const struct wimlib_update_command *delete_cmd)
 298 {
 299         int flags;
 300         const tchar *wim_path;
 301         struct wim_dentry *tree;
 302         bool is_root;
 303
 304         wimlib_assert(delete_cmd->op == WIMLIB_UPDATE_OP_DELETE);
 305         flags = delete_cmd->delete.delete_flags;
 306         wim_path = delete_cmd->delete.wim_path;
 307
 308         DEBUG("Deleting WIM path \"%"TS"\" (flags=%#x)", wim_path, flags);
 309
 310         tree = get_dentry(wim, wim_path);
 311         if (!tree) {
 312                 /* Path to delete does not exist in the WIM. */
 313                 if (flags & WIMLIB_DELETE_FLAG_FORCE) {
 314                         return 0;
 315                 } else {
 316                         ERROR("Path \"%"TS"\" does not exist in WIM image %d",
 317                               wim_path, wim->current_image);
 318                         return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 319                 }
 320         }
 321
 322         if (dentry_is_directory(tree) && !(flags & WIMLIB_DELETE_FLAG_RECURSIVE)) {
 323                 ERROR("Path \"%"TS"\" in WIM image %d is a directory "
 324                       "but a recursive delete was not requested",
 325                       wim_path, wim->current_image);
 326                 return WIMLIB_ERR_IS_DIRECTORY;
 327         }
 328
 329         is_root = dentry_is_root(tree);
 330         unlink_dentry(tree);
 331         free_dentry_tree(tree, wim->lookup_table);
 332         if (is_root)
 333                 wim->image_metadata[wim->current_image - 1]->root_dentry = NULL;
 334         return 0;
 335 }
 336
 337 /*
 338  * Rename a file or directory in the WIM.
 339  *
 340  * This is also called from wimfs_rename() in the FUSE mount code.
 341  */
 342 int
 343 rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to)
 344 {
 345         struct wim_dentry *src;
 346         struct wim_dentry *dst;
 347         struct wim_dentry *parent_of_dst;
 348         int ret;
 349
 350         /* This rename() implementation currently only supports actual files
 351          * (not alternate data streams) */
 352
 353         src = get_dentry(wim, from);
 354         if (!src)
 355                 return -errno;
 356
 357         dst = get_dentry(wim, to);
 358
 359         if (dst) {
 360                 /* Destination file exists */
 361
 362                 if (src == dst) /* Same file */
 363                         return 0;
 364
 365                 if (!dentry_is_directory(src)) {
 366                         /* Cannot rename non-directory to directory. */
 367                         if (dentry_is_directory(dst))
 368                                 return -EISDIR;
 369                 } else {
 370                         /* Cannot rename directory to a non-directory or a non-empty
 371                          * directory */
 372                         if (!dentry_is_directory(dst))
 373                                 return -ENOTDIR;
 374                         if (inode_has_children(dst->d_inode))
 375                                 return -ENOTEMPTY;
 376                 }
 377                 parent_of_dst = dst->parent;
 378         } else {
 379                 /* Destination does not exist */
 380                 parent_of_dst = get_parent_dentry(wim, to);
 381                 if (!parent_of_dst)
 382                         return -errno;
 383
 384                 if (!dentry_is_directory(parent_of_dst))
 385                         return -ENOTDIR;
 386         }
 387
 388         ret = set_dentry_name(src, path_basename(to));
 389         if (ret)
 390                 return -ENOMEM;
 391         if (dst) {
 392                 unlink_dentry(dst);
 393                 free_dentry_tree(dst, wim->lookup_table);
 394         }
 395         unlink_dentry(src);
 396         dentry_add_child(parent_of_dst, src);
 397         return 0;
 398 }
 399
 400
 401 static int
 402 execute_rename_command(WIMStruct *wim,
 403                        const struct wimlib_update_command *rename_cmd)
 404 {
 405         int ret;
 406
 407         wimlib_assert(rename_cmd->op == WIMLIB_UPDATE_OP_RENAME);
 408
 409         ret = rename_wim_path(wim, rename_cmd->rename.wim_source_path,
 410                               rename_cmd->rename.wim_target_path);
 411         if (ret) {
 412                 ret = -ret;
 413                 errno = ret;
 414                 ERROR_WITH_ERRNO("Can't rename \"%"TS"\" to \"%"TS"\"",
 415                                  rename_cmd->rename.wim_source_path,
 416                                  rename_cmd->rename.wim_target_path);
 417                 switch (ret) {
 418                 case ENOMEM:
 419                         ret = WIMLIB_ERR_NOMEM;
 420                         break;
 421                 case ENOTDIR:
 422                         ret = WIMLIB_ERR_NOTDIR;
 423                         break;
 424                 case ENOTEMPTY:
 425                         ret = WIMLIB_ERR_NOTEMPTY;
 426                         break;
 427                 case EISDIR:
 428                         ret = WIMLIB_ERR_IS_DIRECTORY;
 429                         break;
 430                 case ENOENT:
 431                 default:
 432                         ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 433                         break;
 434                 }
 435         }
 436         return ret;
 437 }
 438
 439 static inline const tchar *
 440 update_op_to_str(int op)
 441 {
 442         switch (op) {
 443         case WIMLIB_UPDATE_OP_ADD:
 444                 return T("add");
 445         case WIMLIB_UPDATE_OP_DELETE:
 446                 return T("delete");
 447         case WIMLIB_UPDATE_OP_RENAME:
 448                 return T("rename");
 449         default:
 450                 wimlib_assert(0);
 451         }
 452 }
 453
 454 static int
 455 execute_update_commands(WIMStruct *wim,
 456                         const struct wimlib_update_command *cmds,
 457                         size_t num_cmds,
 458                         wimlib_progress_func_t progress_func)
 459 {
 460         int ret = 0;
 461         for (size_t i = 0; i < num_cmds; i++) {
 462                 DEBUG("Executing update command %zu of %zu (op=%"TS")",
 463                       i + 1, num_cmds, update_op_to_str(cmds[i].op));
 464                 switch (cmds[i].op) {
 465                 case WIMLIB_UPDATE_OP_ADD:
 466                         ret = execute_add_command(wim, &cmds[i], progress_func);
 467                         break;
 468                 case WIMLIB_UPDATE_OP_DELETE:
 469                         ret = execute_delete_command(wim, &cmds[i]);
 470                         break;
 471                 case WIMLIB_UPDATE_OP_RENAME:
 472                         ret = execute_rename_command(wim, &cmds[i]);
 473                         break;
 474                 default:
 475                         wimlib_assert(0);
 476                 }
 477                 if (ret)
 478                         break;
 479         }
 480         return ret;
 481 }
 482
 483 static int
 484 check_add_command(struct wimlib_update_command *cmd,
 485                   const struct wim_header *hdr)
 486 {
 487         int add_flags = cmd->add.add_flags;
 488
 489         /* Are we adding the entire image or not?  An empty wim_target_path
 490          * indicates that the tree we're adding is to be placed in the root of
 491          * the image.  We consider this to be capturing the entire image,
 492          * although it could potentially be an overlay on an existing root as
 493          * well. */
 494         bool is_entire_image = cmd->add.wim_target_path[0] == T('\0');
 495
 496 #ifdef __WIN32__
 497         /* Check for flags not supported on Windows */
 498         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 499                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 500                 ERROR("we cannot capture a WIM image directly from a NTFS volume");
 501                 return WIMLIB_ERR_UNSUPPORTED;
 502         }
 503         if (add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
 504                 ERROR("Capturing UNIX-specific data is not supported on Windows");
 505                 return WIMLIB_ERR_UNSUPPORTED;
 506         }
 507         if (add_flags & WIMLIB_ADD_FLAG_DEREFERENCE) {
 508                 ERROR("Dereferencing symbolic links is not supported on Windows");
 509                 return WIMLIB_ERR_UNSUPPORTED;
 510         }
 511 #endif
 512
 513         /* VERBOSE implies EXCLUDE_VERBOSE */
 514         if (add_flags & WIMLIB_ADD_FLAG_VERBOSE)
 515                 add_flags |= WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE;
 516
 517         /* Check for contradictory reparse point fixup flags */
 518         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 519                           WIMLIB_ADD_FLAG_NORPFIX)) ==
 520                 (WIMLIB_ADD_FLAG_RPFIX |
 521                  WIMLIB_ADD_FLAG_NORPFIX))
 522         {
 523                 ERROR("Cannot specify RPFIX and NORPFIX flags "
 524                       "at the same time!");
 525                 return WIMLIB_ERR_INVALID_PARAM;
 526         }
 527
 528         /* Set default behavior on reparse point fixups if requested */
 529         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 530                           WIMLIB_ADD_FLAG_NORPFIX)) == 0)
 531         {
 532                 /* Do reparse-point fixups by default if we are capturing an
 533                  * entire image and either the header flag is set from previous
 534                  * images, or if this is the first image being added. */
 535                 if (is_entire_image &&
 536                     ((hdr->flags & WIM_HDR_FLAG_RP_FIX) || hdr->image_count == 1))
 537                         add_flags |= WIMLIB_ADD_FLAG_RPFIX;
 538         }
 539
 540         if (!is_entire_image) {
 541                 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 542                         ERROR("Cannot add directly from a NTFS volume "
 543                               "when not capturing a full image!");
 544                         return WIMLIB_ERR_INVALID_PARAM;
 545                 }
 546
 547                 if (add_flags & WIMLIB_ADD_FLAG_RPFIX) {
 548                         ERROR("Cannot do reparse point fixups when "
 549                               "not capturing a full image!");
 550                         return WIMLIB_ERR_INVALID_PARAM;
 551                 }
 552         }
 553         /* We may have modified the add flags. */
 554         cmd->add.add_flags = add_flags;
 555         return 0;
 556 }
 557
 558 static int
 559 check_update_command(struct wimlib_update_command *cmd,
 560                      const struct wim_header *hdr)
 561 {
 562         switch (cmd->op) {
 563         case WIMLIB_UPDATE_OP_ADD:
 564                 return check_add_command(cmd, hdr);
 565         case WIMLIB_UPDATE_OP_DELETE:
 566         case WIMLIB_UPDATE_OP_RENAME:
 567                 break;
 568         }
 569         return 0;
 570 }
 571
 572 static int
 573 check_update_commands(struct wimlib_update_command *cmds, size_t num_cmds,
 574                       const struct wim_header *hdr)
 575 {
 576         int ret = 0;
 577         for (size_t i = 0; i < num_cmds; i++) {
 578                 ret = check_update_command(&cmds[i], hdr);
 579                 if (ret)
 580                         break;
 581         }
 582         return ret;
 583 }
 584
 585
 586 extern void
 587 free_update_commands(struct wimlib_update_command *cmds, size_t num_cmds)
 588 {
 589         if (cmds) {
 590                 for (size_t i = 0; i < num_cmds; i++) {
 591                         switch (cmds[i].op) {
 592                         case WIMLIB_UPDATE_OP_ADD:
 593                                 FREE(cmds[i].add.fs_source_path);
 594                                 FREE(cmds[i].add.wim_target_path);
 595                                 free_capture_config(cmds[i].add.config);
 596                                 break;
 597                         case WIMLIB_UPDATE_OP_DELETE:
 598                                 FREE(cmds[i].delete.wim_path);
 599                                 break;
 600                         case WIMLIB_UPDATE_OP_RENAME:
 601                                 FREE(cmds[i].rename.wim_source_path);
 602                                 FREE(cmds[i].rename.wim_target_path);
 603                                 break;
 604                         }
 605                 }
 606                 FREE(cmds);
 607         }
 608 }
 609
 610 static int
 611 copy_update_commands(const struct wimlib_update_command *cmds,
 612                      size_t num_cmds,
 613                      struct wimlib_update_command **cmds_copy_ret)
 614 {
 615         int ret;
 616         struct wimlib_update_command *cmds_copy;
 617
 618         cmds_copy = CALLOC(num_cmds, sizeof(cmds[0]));
 619         if (!cmds_copy)
 620                 goto oom;
 621
 622         for (size_t i = 0; i < num_cmds; i++) {
 623                 cmds_copy[i].op = cmds[i].op;
 624                 switch (cmds[i].op) {
 625                 case WIMLIB_UPDATE_OP_ADD:
 626                         cmds_copy[i].add.fs_source_path =
 627                                 canonicalize_fs_path(cmds[i].add.fs_source_path);
 628                         cmds_copy[i].add.wim_target_path =
 629                                 canonicalize_wim_path(cmds[i].add.wim_target_path);
 630                         if (!cmds_copy[i].add.fs_source_path ||
 631                             !cmds_copy[i].add.wim_target_path)
 632                                 goto oom;
 633                         if (cmds[i].add.config) {
 634                                 ret = copy_and_canonicalize_capture_config(cmds[i].add.config,
 635                                                                            &cmds_copy[i].add.config);
 636                                 if (ret)
 637                                         goto err;
 638                         }
 639                         cmds_copy[i].add.add_flags = cmds[i].add.add_flags;
 640                         break;
 641                 case WIMLIB_UPDATE_OP_DELETE:
 642                         cmds_copy[i].delete.wim_path =
 643                                 canonicalize_wim_path(cmds[i].delete.wim_path);
 644                         if (!cmds_copy[i].delete.wim_path)
 645                                 goto oom;
 646                         cmds_copy[i].delete.delete_flags = cmds[i].delete.delete_flags;
 647                         break;
 648                 case WIMLIB_UPDATE_OP_RENAME:
 649                         cmds_copy[i].rename.wim_source_path =
 650                                 canonicalize_wim_path(cmds[i].rename.wim_source_path);
 651                         cmds_copy[i].rename.wim_target_path =
 652                                 canonicalize_wim_path(cmds[i].rename.wim_target_path);
 653                         if (!cmds_copy[i].rename.wim_source_path ||
 654                             !cmds_copy[i].rename.wim_target_path)
 655                                 goto oom;
 656                         break;
 657                 default:
 658                         ERROR("Unknown update operation %u", cmds[i].op);
 659                         ret = WIMLIB_ERR_INVALID_PARAM;
 660                         goto err;
 661                 }
 662         }
 663         *cmds_copy_ret = cmds_copy;
 664         ret = 0;
 665 out:
 666         return ret;
 667 oom:
 668         ret = WIMLIB_ERR_NOMEM;
 669 err:
 670         free_update_commands(cmds_copy, num_cmds);
 671         goto out;
 672 }
 673
 674 /*
 675  * Entry point for making a series of updates to a WIM image.
 676  */
 677 WIMLIBAPI int
 678 wimlib_update_image(WIMStruct *wim,
 679                     int image,
 680                     const struct wimlib_update_command *cmds,
 681                     size_t num_cmds,
 682                     int update_flags,
 683                     wimlib_progress_func_t progress_func)
 684 {
 685         int ret;
 686         struct wimlib_update_command *cmds_copy;
 687
 688         DEBUG("Updating image %d with %zu commands", image, num_cmds);
 689
 690         /* Refuse to update a split WIM. */
 691         if (wim->hdr.total_parts != 1) {
 692                 ERROR("Cannot update a split WIM!");
 693                 ret = WIMLIB_ERR_SPLIT_UNSUPPORTED;
 694                 goto out;
 695         }
 696
 697         /* Load the metadata for the image to modify (if not loaded already) */
 698         ret = select_wim_image(wim, image);
 699         if (ret)
 700                 goto out;
 701
 702         /* Short circuit a successful return if no commands were specified.
 703          * Avoids problems with trying to allocate 0 bytes of memory. */
 704         if (num_cmds == 0)
 705                 goto out;
 706
 707         DEBUG("Preparing %zu update commands", num_cmds);
 708
 709         /* Make a copy of the update commands, in the process doing certain
 710          * canonicalizations on paths (e.g. translating backslashes to forward
 711          * slashes).  This is done to avoid modifying the caller's copy of the
 712          * commands. */
 713         ret = copy_update_commands(cmds, num_cmds, &cmds_copy);
 714         if (ret)
 715                 goto out;
 716
 717         /* Perform additional checks on the update commands before we execute
 718          * them. */
 719         ret = check_update_commands(cmds_copy, num_cmds, &wim->hdr);
 720         if (ret)
 721                 goto out_free_cmds_copy;
 722
 723         /* Actually execute the update commands. */
 724         DEBUG("Executing %zu update commands", num_cmds);
 725         ret = execute_update_commands(wim, cmds_copy, num_cmds, progress_func);
 726         if (ret)
 727                 goto out_free_cmds_copy;
 728
 729         wim->image_metadata[image - 1]->modified = 1;
 730
 731         /* Statistics about the WIM image, such as the numbers of files and
 732          * directories, may have changed.  Call xml_update_image_info() to
 733          * recalculate these statistics. */
 734         xml_update_image_info(wim, image);
 735 out_free_cmds_copy:
 736         free_update_commands(cmds_copy, num_cmds);
 737 out:
 738         return ret;
 739 }