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