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_image_metadata *imd;
 172         struct list_head unhashed_streams;
 173         struct add_image_params params;
 174         int (*capture_tree)(struct wim_dentry **,
 175                             const tchar *,
 176                             struct add_image_params *);
 177         union wimlib_progress_info progress;
 178         struct wimlib_capture_config *config;
 179 #ifdef WITH_NTFS_3G
 180         struct _ntfs_volume *ntfs_vol = NULL;
 181 #endif
 182         void *extra_arg;
 183         struct wim_dentry *branch;
 184         bool rollback_sd = true;
 185
 186         wimlib_assert(add_cmd->op == WIMLIB_UPDATE_OP_ADD);
 187         add_flags = add_cmd->add.add_flags;
 188         fs_source_path = add_cmd->add.fs_source_path;
 189         wim_target_path = add_cmd->add.wim_target_path;
 190         config = add_cmd->add.config;
 191         DEBUG("fs_source_path=\"%"TS"\", wim_target_path=\"%"TS"\", add_flags=%#x",
 192               fs_source_path, wim_target_path, add_flags);
 193
 194         imd = wim->image_metadata[wim->current_image - 1];
 195
 196         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 197         #ifdef WITH_NTFS_3G
 198                 capture_tree = build_dentry_tree_ntfs;
 199                 extra_arg = &ntfs_vol;
 200                 if (imd->ntfs_vol != NULL) {
 201                         ERROR("NTFS volume already set");
 202                         ret = WIMLIB_ERR_INVALID_PARAM;
 203                         goto out;
 204                 }
 205         #else
 206                 ret = WIMLIB_ERR_INVALID_PARAM;
 207                 goto out;
 208         #endif
 209         } else {
 210         #ifdef __WIN32__
 211                 capture_tree = win32_build_dentry_tree;
 212         #else
 213                 capture_tree = unix_build_dentry_tree;
 214         #endif
 215                 extra_arg = NULL;
 216         }
 217
 218         ret = init_inode_table(&params.inode_table, 9001);
 219         if (ret)
 220                 goto out;
 221
 222         ret = init_sd_set(&params.sd_set, imd->security_data);
 223         if (ret)
 224                 goto out_destroy_inode_table;
 225
 226         INIT_LIST_HEAD(&unhashed_streams);
 227         wim->lookup_table->unhashed_streams = &unhashed_streams;
 228         params.lookup_table = wim->lookup_table;
 229         params.config = config;
 230         params.add_flags = add_flags;
 231         params.progress_func = progress_func;
 232         params.extra_arg = extra_arg;
 233
 234         if (progress_func) {
 235                 memset(&progress, 0, sizeof(progress));
 236                 progress.scan.source = fs_source_path;
 237                 progress.scan.wim_target_path = wim_target_path;
 238                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &progress);
 239         }
 240         config->_prefix = fs_source_path;
 241         config->_prefix_num_tchars = tstrlen(fs_source_path);
 242
 243         if (wim_target_path[0] == T('\0'))
 244                 add_flags |= WIMLIB_ADD_FLAG_ROOT;
 245         ret = (*capture_tree)(&branch, fs_source_path, &params);
 246         if (ret) {
 247                 ERROR("Failed to build dentry tree for \"%"TS"\"",
 248                       fs_source_path);
 249                 goto out_destroy_sd_set;
 250         }
 251         if (branch) {
 252                 /* Use the target name, not the source name, for
 253                  * the root of each branch from a capture
 254                  * source.  (This will also set the root dentry
 255                  * of the entire image to be unnamed.) */
 256                 ret = set_dentry_name(branch,
 257                                       path_basename(wim_target_path));
 258                 if (ret)
 259                         goto out_ntfs_umount;
 260
 261                 ret = attach_branch(&imd->root_dentry, branch, wim_target_path);
 262                 if (ret)
 263                         goto out_ntfs_umount;
 264         }
 265         if (progress_func)
 266                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &progress);
 267         list_splice_tail(&unhashed_streams, &imd->unhashed_streams);
 268 #ifdef WITH_NTFS_3G
 269         imd->ntfs_vol = ntfs_vol;
 270 #endif
 271         inode_table_prepare_inode_list(&params.inode_table, &imd->inode_list);
 272         ret = 0;
 273         rollback_sd = false;
 274         if (add_flags & WIMLIB_ADD_FLAG_RPFIX)
 275                 wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 276         goto out_destroy_sd_set;
 277 out_ntfs_umount:
 278 #ifdef WITH_NTFS_3G
 279         if (ntfs_vol)
 280                 do_ntfs_umount(ntfs_vol);
 281 #endif
 282         free_dentry_tree(branch, wim->lookup_table);
 283 out_destroy_sd_set:
 284         destroy_sd_set(&params.sd_set, rollback_sd);
 285 out_destroy_inode_table:
 286         destroy_inode_table(&params.inode_table);
 287 out:
 288         return ret;
 289 }
 290
 291 static int
 292 execute_delete_command(WIMStruct *wim,
 293                        const struct wimlib_update_command *delete_cmd)
 294 {
 295         int flags;
 296         const tchar *wim_path;
 297         struct wim_dentry *tree;
 298         bool is_root;
 299
 300         wimlib_assert(delete_cmd->op == WIMLIB_UPDATE_OP_DELETE);
 301         flags = delete_cmd->delete.delete_flags;
 302         wim_path = delete_cmd->delete.wim_path;
 303
 304         DEBUG("Deleting WIM path \"%"TS"\" (flags=%#x)", wim_path, flags);
 305
 306         tree = get_dentry(wim, wim_path);
 307         if (!tree) {
 308                 /* Path to delete does not exist in the WIM. */
 309                 if (flags & WIMLIB_DELETE_FLAG_FORCE) {
 310                         return 0;
 311                 } else {
 312                         ERROR("Path \"%"TS"\" does not exist in WIM image %d",
 313                               wim_path, wim->current_image);
 314                         return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 315                 }
 316         }
 317
 318         if (dentry_is_directory(tree) && !(flags & WIMLIB_DELETE_FLAG_RECURSIVE)) {
 319                 ERROR("Path \"%"TS"\" in WIM image %d is a directory "
 320                       "but a recursive delete was not requested",
 321                       wim_path, wim->current_image);
 322                 return WIMLIB_ERR_IS_DIRECTORY;
 323         }
 324
 325         is_root = dentry_is_root(tree);
 326         unlink_dentry(tree);
 327         free_dentry_tree(tree, wim->lookup_table);
 328         if (is_root)
 329                 wim->image_metadata[wim->current_image - 1]->root_dentry = NULL;
 330         return 0;
 331 }
 332
 333 static int
 334 free_dentry_full_path(struct wim_dentry *dentry, void *_ignore)
 335 {
 336         FREE(dentry->_full_path);
 337         dentry->_full_path = NULL;
 338         return 0;
 339 }
 340
 341 /*
 342  * Rename a file or directory in the WIM.
 343  *
 344  * This is also called from wimfs_rename() in the FUSE mount code.
 345  */
 346 int
 347 rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to)
 348 {
 349         struct wim_dentry *src;
 350         struct wim_dentry *dst;
 351         struct wim_dentry *parent_of_dst;
 352         int ret;
 353
 354         /* This rename() implementation currently only supports actual files
 355          * (not alternate data streams) */
 356
 357         src = get_dentry(wim, from);
 358         if (!src)
 359                 return -errno;
 360
 361         dst = get_dentry(wim, to);
 362
 363         if (dst) {
 364                 /* Destination file exists */
 365
 366                 if (src == dst) /* Same file */
 367                         return 0;
 368
 369                 if (!dentry_is_directory(src)) {
 370                         /* Cannot rename non-directory to directory. */
 371                         if (dentry_is_directory(dst))
 372                                 return -EISDIR;
 373                 } else {
 374                         /* Cannot rename directory to a non-directory or a non-empty
 375                          * directory */
 376                         if (!dentry_is_directory(dst))
 377                                 return -ENOTDIR;
 378                         if (inode_has_children(dst->d_inode))
 379                                 return -ENOTEMPTY;
 380                 }
 381                 parent_of_dst = dst->parent;
 382         } else {
 383                 /* Destination does not exist */
 384                 parent_of_dst = get_parent_dentry(wim, to);
 385                 if (!parent_of_dst)
 386                         return -errno;
 387
 388                 if (!dentry_is_directory(parent_of_dst))
 389                         return -ENOTDIR;
 390         }
 391
 392         ret = set_dentry_name(src, path_basename(to));
 393         if (ret)
 394                 return -ENOMEM;
 395         if (dst) {
 396                 unlink_dentry(dst);
 397                 free_dentry_tree(dst, wim->lookup_table);
 398         }
 399         unlink_dentry(src);
 400         dentry_add_child(parent_of_dst, src);
 401         if (src->_full_path)
 402                 for_dentry_in_tree(src, free_dentry_full_path, NULL);
 403         return 0;
 404 }
 405
 406
 407 static int
 408 execute_rename_command(WIMStruct *wim,
 409                        const struct wimlib_update_command *rename_cmd)
 410 {
 411         int ret;
 412
 413         wimlib_assert(rename_cmd->op == WIMLIB_UPDATE_OP_RENAME);
 414
 415         ret = rename_wim_path(wim, rename_cmd->rename.wim_source_path,
 416                               rename_cmd->rename.wim_target_path);
 417         if (ret) {
 418                 ret = -ret;
 419                 errno = ret;
 420                 ERROR_WITH_ERRNO("Can't rename \"%"TS"\" to \"%"TS"\"",
 421                                  rename_cmd->rename.wim_source_path,
 422                                  rename_cmd->rename.wim_target_path);
 423                 switch (ret) {
 424                 case ENOMEM:
 425                         ret = WIMLIB_ERR_NOMEM;
 426                         break;
 427                 case ENOTDIR:
 428                         ret = WIMLIB_ERR_NOTDIR;
 429                         break;
 430                 case ENOTEMPTY:
 431                         ret = WIMLIB_ERR_NOTEMPTY;
 432                         break;
 433                 case EISDIR:
 434                         ret = WIMLIB_ERR_IS_DIRECTORY;
 435                         break;
 436                 case ENOENT:
 437                 default:
 438                         ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 439                         break;
 440                 }
 441         }
 442         return ret;
 443 }
 444
 445 static inline const tchar *
 446 update_op_to_str(int op)
 447 {
 448         switch (op) {
 449         case WIMLIB_UPDATE_OP_ADD:
 450                 return T("add");
 451         case WIMLIB_UPDATE_OP_DELETE:
 452                 return T("delete");
 453         case WIMLIB_UPDATE_OP_RENAME:
 454                 return T("rename");
 455         default:
 456                 wimlib_assert(0);
 457         }
 458 }
 459
 460 static int
 461 execute_update_commands(WIMStruct *wim,
 462                         const struct wimlib_update_command *cmds,
 463                         size_t num_cmds,
 464                         wimlib_progress_func_t progress_func)
 465 {
 466         int ret = 0;
 467         for (size_t i = 0; i < num_cmds; i++) {
 468                 DEBUG("Executing update command %zu of %zu (op=%"TS")",
 469                       i + 1, num_cmds, update_op_to_str(cmds[i].op));
 470                 switch (cmds[i].op) {
 471                 case WIMLIB_UPDATE_OP_ADD:
 472                         ret = execute_add_command(wim, &cmds[i], progress_func);
 473                         break;
 474                 case WIMLIB_UPDATE_OP_DELETE:
 475                         ret = execute_delete_command(wim, &cmds[i]);
 476                         break;
 477                 case WIMLIB_UPDATE_OP_RENAME:
 478                         ret = execute_rename_command(wim, &cmds[i]);
 479                         break;
 480                 default:
 481                         wimlib_assert(0);
 482                 }
 483                 if (ret)
 484                         break;
 485         }
 486         return ret;
 487 }
 488
 489 static int
 490 check_add_command(struct wimlib_update_command *cmd,
 491                   const struct wim_header *hdr)
 492 {
 493         int add_flags = cmd->add.add_flags;
 494
 495         /* Are we adding the entire image or not?  An empty wim_target_path
 496          * indicates that the tree we're adding is to be placed in the root of
 497          * the image.  We consider this to be capturing the entire image,
 498          * although it could potentially be an overlay on an existing root as
 499          * well. */
 500         bool is_entire_image = cmd->add.wim_target_path[0] == T('\0');
 501
 502 #ifdef __WIN32__
 503         /* Check for flags not supported on Windows */
 504         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 505                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 506                 ERROR("we cannot capture a WIM image directly from a NTFS volume");
 507                 return WIMLIB_ERR_UNSUPPORTED;
 508         }
 509         if (add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
 510                 ERROR("Capturing UNIX-specific data is not supported on Windows");
 511                 return WIMLIB_ERR_UNSUPPORTED;
 512         }
 513         if (add_flags & WIMLIB_ADD_FLAG_DEREFERENCE) {
 514                 ERROR("Dereferencing symbolic links is not supported on Windows");
 515                 return WIMLIB_ERR_UNSUPPORTED;
 516         }
 517 #endif
 518
 519         /* VERBOSE implies EXCLUDE_VERBOSE */
 520         if (add_flags & WIMLIB_ADD_FLAG_VERBOSE)
 521                 add_flags |= WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE;
 522
 523         /* Check for contradictory reparse point fixup flags */
 524         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 525                           WIMLIB_ADD_FLAG_NORPFIX)) ==
 526                 (WIMLIB_ADD_FLAG_RPFIX |
 527                  WIMLIB_ADD_FLAG_NORPFIX))
 528         {
 529                 ERROR("Cannot specify RPFIX and NORPFIX flags "
 530                       "at the same time!");
 531                 return WIMLIB_ERR_INVALID_PARAM;
 532         }
 533
 534         /* Set default behavior on reparse point fixups if requested */
 535         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 536                           WIMLIB_ADD_FLAG_NORPFIX)) == 0)
 537         {
 538                 /* Do reparse-point fixups by default if we are capturing an
 539                  * entire image and either the header flag is set from previous
 540                  * images, or if this is the first image being added. */
 541                 if (is_entire_image &&
 542                     ((hdr->flags & WIM_HDR_FLAG_RP_FIX) || hdr->image_count == 1))
 543                         add_flags |= WIMLIB_ADD_FLAG_RPFIX;
 544         }
 545
 546         if (!is_entire_image) {
 547                 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 548                         ERROR("Cannot add directly from a NTFS volume "
 549                               "when not capturing a full image!");
 550                         return WIMLIB_ERR_INVALID_PARAM;
 551                 }
 552
 553                 if (add_flags & WIMLIB_ADD_FLAG_RPFIX) {
 554                         ERROR("Cannot do reparse point fixups when "
 555                               "not capturing a full image!");
 556                         return WIMLIB_ERR_INVALID_PARAM;
 557                 }
 558         }
 559         /* We may have modified the add flags. */
 560         cmd->add.add_flags = add_flags;
 561         return 0;
 562 }
 563
 564 static int
 565 check_update_command(struct wimlib_update_command *cmd,
 566                      const struct wim_header *hdr)
 567 {
 568         switch (cmd->op) {
 569         case WIMLIB_UPDATE_OP_ADD:
 570                 return check_add_command(cmd, hdr);
 571         case WIMLIB_UPDATE_OP_DELETE:
 572         case WIMLIB_UPDATE_OP_RENAME:
 573                 break;
 574         }
 575         return 0;
 576 }
 577
 578 static int
 579 check_update_commands(struct wimlib_update_command *cmds, size_t num_cmds,
 580                       const struct wim_header *hdr)
 581 {
 582         int ret = 0;
 583         for (size_t i = 0; i < num_cmds; i++) {
 584                 ret = check_update_command(&cmds[i], hdr);
 585                 if (ret)
 586                         break;
 587         }
 588         return ret;
 589 }
 590
 591
 592 extern void
 593 free_update_commands(struct wimlib_update_command *cmds, size_t num_cmds)
 594 {
 595         if (cmds) {
 596                 for (size_t i = 0; i < num_cmds; i++) {
 597                         switch (cmds[i].op) {
 598                         case WIMLIB_UPDATE_OP_ADD:
 599                                 FREE(cmds[i].add.fs_source_path);
 600                                 FREE(cmds[i].add.wim_target_path);
 601                                 free_capture_config(cmds[i].add.config);
 602                                 break;
 603                         case WIMLIB_UPDATE_OP_DELETE:
 604                                 FREE(cmds[i].delete.wim_path);
 605                                 break;
 606                         case WIMLIB_UPDATE_OP_RENAME:
 607                                 FREE(cmds[i].rename.wim_source_path);
 608                                 FREE(cmds[i].rename.wim_target_path);
 609                                 break;
 610                         }
 611                 }
 612                 FREE(cmds);
 613         }
 614 }
 615
 616 static int
 617 copy_update_commands(const struct wimlib_update_command *cmds,
 618                      size_t num_cmds,
 619                      struct wimlib_update_command **cmds_copy_ret)
 620 {
 621         int ret;
 622         struct wimlib_update_command *cmds_copy;
 623
 624         cmds_copy = CALLOC(num_cmds, sizeof(cmds[0]));
 625         if (!cmds_copy)
 626                 goto oom;
 627
 628         for (size_t i = 0; i < num_cmds; i++) {
 629                 cmds_copy[i].op = cmds[i].op;
 630                 switch (cmds[i].op) {
 631                 case WIMLIB_UPDATE_OP_ADD:
 632                         cmds_copy[i].add.fs_source_path =
 633                                 canonicalize_fs_path(cmds[i].add.fs_source_path);
 634                         cmds_copy[i].add.wim_target_path =
 635                                 canonicalize_wim_path(cmds[i].add.wim_target_path);
 636                         if (!cmds_copy[i].add.fs_source_path ||
 637                             !cmds_copy[i].add.wim_target_path)
 638                                 goto oom;
 639                         if (cmds[i].add.config) {
 640                                 ret = copy_and_canonicalize_capture_config(cmds[i].add.config,
 641                                                                            &cmds_copy[i].add.config);
 642                                 if (ret)
 643                                         goto err;
 644                         }
 645                         cmds_copy[i].add.add_flags = cmds[i].add.add_flags;
 646                         break;
 647                 case WIMLIB_UPDATE_OP_DELETE:
 648                         cmds_copy[i].delete.wim_path =
 649                                 canonicalize_wim_path(cmds[i].delete.wim_path);
 650                         if (!cmds_copy[i].delete.wim_path)
 651                                 goto oom;
 652                         cmds_copy[i].delete.delete_flags = cmds[i].delete.delete_flags;
 653                         break;
 654                 case WIMLIB_UPDATE_OP_RENAME:
 655                         cmds_copy[i].rename.wim_source_path =
 656                                 canonicalize_wim_path(cmds[i].rename.wim_source_path);
 657                         cmds_copy[i].rename.wim_target_path =
 658                                 canonicalize_wim_path(cmds[i].rename.wim_target_path);
 659                         if (!cmds_copy[i].rename.wim_source_path ||
 660                             !cmds_copy[i].rename.wim_target_path)
 661                                 goto oom;
 662                         break;
 663                 default:
 664                         ERROR("Unknown update operation %u", cmds[i].op);
 665                         ret = WIMLIB_ERR_INVALID_PARAM;
 666                         goto err;
 667                 }
 668         }
 669         *cmds_copy_ret = cmds_copy;
 670         ret = 0;
 671 out:
 672         return ret;
 673 oom:
 674         ret = WIMLIB_ERR_NOMEM;
 675 err:
 676         free_update_commands(cmds_copy, num_cmds);
 677         goto out;
 678 }
 679
 680 /*
 681  * Entry point for making a series of updates to a WIM image.
 682  */
 683 WIMLIBAPI int
 684 wimlib_update_image(WIMStruct *wim,
 685                     int image,
 686                     const struct wimlib_update_command *cmds,
 687                     size_t num_cmds,
 688                     int update_flags,
 689                     wimlib_progress_func_t progress_func)
 690 {
 691         int ret;
 692         struct wimlib_update_command *cmds_copy;
 693
 694         DEBUG("Updating image %d with %zu commands", image, num_cmds);
 695
 696         /* Refuse to update a split WIM. */
 697         if (wim->hdr.total_parts != 1) {
 698                 ERROR("Cannot update a split WIM!");
 699                 ret = WIMLIB_ERR_SPLIT_UNSUPPORTED;
 700                 goto out;
 701         }
 702
 703         /* Load the metadata for the image to modify (if not loaded already) */
 704         ret = select_wim_image(wim, image);
 705         if (ret)
 706                 goto out;
 707
 708         /* Short circuit a successful return if no commands were specified.
 709          * Avoids problems with trying to allocate 0 bytes of memory. */
 710         if (num_cmds == 0)
 711                 goto out;
 712
 713         DEBUG("Preparing %zu update commands", num_cmds);
 714
 715         /* Make a copy of the update commands, in the process doing certain
 716          * canonicalizations on paths (e.g. translating backslashes to forward
 717          * slashes).  This is done to avoid modifying the caller's copy of the
 718          * commands. */
 719         ret = copy_update_commands(cmds, num_cmds, &cmds_copy);
 720         if (ret)
 721                 goto out;
 722
 723         /* Perform additional checks on the update commands before we execute
 724          * them. */
 725         ret = check_update_commands(cmds_copy, num_cmds, &wim->hdr);
 726         if (ret)
 727                 goto out_free_cmds_copy;
 728
 729         /* Actually execute the update commands. */
 730         DEBUG("Executing %zu update commands", num_cmds);
 731         ret = execute_update_commands(wim, cmds_copy, num_cmds, progress_func);
 732         if (ret)
 733                 goto out_free_cmds_copy;
 734
 735         wim->image_metadata[image - 1]->modified = 1;
 736
 737         /* Statistics about the WIM image, such as the numbers of files and
 738          * directories, may have changed.  Call xml_update_image_info() to
 739          * recalculate these statistics. */
 740         xml_update_image_info(wim, image);
 741 out_free_cmds_copy:
 742         free_update_commands(cmds_copy, num_cmds);
 743 out:
 744         return ret;
 745 }