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