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 /* Creates a new directory to place in the WIM image.  This is to create parent
  32  * directories that are not part of any target as needed.  */
  33 static int
  34 new_filler_directory(const tchar *name, struct wim_dentry **dentry_ret)
  35 {
  36         int ret;
  37         struct wim_dentry *dentry;
  38
  39         DEBUG("Creating filler directory \"%"TS"\"", name);
  40         ret = new_dentry_with_inode(name, &dentry);
  41         if (ret)
  42                 goto out;
  43         /* Leave the inode number as 0; this is allowed for non
  44          * hard-linked files. */
  45         dentry->d_inode->i_resolved = 1;
  46         dentry->d_inode->i_attributes = FILE_ATTRIBUTE_DIRECTORY;
  47         *dentry_ret = dentry;
  48         ret = 0;
  49 out:
  50         return ret;
  51 }
  52
  53 /* Overlays @branch onto @target, both of which must be directories. */
  54 static int
  55 do_overlay(struct wim_dentry *target, struct wim_dentry *branch)
  56 {
  57         struct rb_root *rb_root;
  58
  59         DEBUG("Doing overlay \"%"WS"\" => \"%"WS"\"",
  60               branch->file_name, target->file_name);
  61
  62         if (!dentry_is_directory(branch) || !dentry_is_directory(target)) {
  63                 ERROR("Cannot overlay \"%"WS"\" onto existing dentry: "
  64                       "is not directory-on-directory!", branch->file_name);
  65                 return WIMLIB_ERR_INVALID_OVERLAY;
  66         }
  67
  68         rb_root = &branch->d_inode->i_children;
  69         while (rb_root->rb_node) { /* While @branch has children... */
  70                 struct wim_dentry *child = rbnode_dentry(rb_root->rb_node);
  71                 struct wim_dentry *existing;
  72
  73                 /* Move @child to the directory @target */
  74                 unlink_dentry(child);
  75                 existing = dentry_add_child(target, child);
  76
  77                 /* File or directory with same name already exists */
  78                 if (existing) {
  79                         int ret;
  80                         ret = do_overlay(existing, child);
  81                         if (ret) {
  82                                 /* Overlay failed.  Revert the change to avoid
  83                                  * leaking the directory tree rooted at @child.
  84                                  * */
  85                                 dentry_add_child(branch, child);
  86                                 return ret;
  87                         }
  88                 }
  89         }
  90         free_dentry(branch);
  91         return 0;
  92 }
  93
  94 /* Attach or overlay a branch onto the WIM image.
  95  *
  96  * @root_p:
  97  *      Pointer to the root of the WIM image, or pointer to NULL if it has not
  98  *      been created yet.
  99  * @branch
 100  *      Branch to add.
 101  * @target_path:
 102  *      Path in the WIM image to add the branch, with leading and trailing
 103  *      slashes stripped.
 104  */
 105 static int
 106 attach_branch(struct wim_dentry **root_p, struct wim_dentry *branch,
 107               tchar *target_path)
 108 {
 109         tchar *slash;
 110         struct wim_dentry *dentry, *parent, *target;
 111         int ret;
 112
 113         DEBUG("Attaching branch \"%"WS"\" => \"%"TS"\"",
 114               branch->file_name, target_path);
 115
 116         if (*target_path == T('\0')) {
 117                 /* Target: root directory */
 118                 if (*root_p) {
 119                         /* Overlay on existing root */
 120                         return do_overlay(*root_p, branch);
 121                 } else {
 122                         if (!dentry_is_directory(branch)) {
 123                                 ERROR("Cannot set non-directory as root of WIM image");
 124                                 return WIMLIB_ERR_NOTDIR;
 125                         }
 126                         /* Set as root */
 127                         *root_p = branch;
 128                         return 0;
 129                 }
 130         }
 131
 132         /* Adding a non-root branch.  Create root if it hasn't been created
 133          * already. */
 134         if (!*root_p) {
 135                 ret  = new_filler_directory(T(""), root_p);
 136                 if (ret)
 137                         return ret;
 138         }
 139
 140         /* Walk the path to the branch, creating filler directories as needed.
 141          * */
 142         parent = *root_p;
 143         while ((slash = tstrchr(target_path, T('/')))) {
 144                 *slash = T('\0');
 145                 dentry = get_dentry_child_with_name(parent, target_path);
 146                 if (!dentry) {
 147                         ret = new_filler_directory(target_path, &dentry);
 148                         if (ret)
 149                                 return ret;
 150                         dentry_add_child(parent, dentry);
 151                 }
 152                 parent = dentry;
 153                 target_path = slash;
 154                 /* Skip over slashes.  Note: this cannot overrun the length of
 155                  * the string because the last character cannot be a slash, as
 156                  * trailing slashes were tripped.  */
 157                 do {
 158                         ++target_path;
 159                 } while (*target_path == T('/'));
 160         }
 161
 162         /* If the target path already existed, overlay the branch onto it.
 163          * Otherwise, set the branch as the target path. */
 164         target = get_dentry_child_with_utf16le_name(parent, branch->file_name,
 165                                                     branch->file_name_nbytes);
 166         if (target) {
 167                 return do_overlay(target, branch);
 168         } else {
 169                 dentry_add_child(parent, branch);
 170                 return 0;
 171         }
 172 }
 173
 174 static int
 175 execute_add_command(WIMStruct *wim,
 176                     const struct wimlib_update_command *add_cmd,
 177                     wimlib_progress_func_t progress_func)
 178 {
 179         int ret;
 180         int add_flags;
 181         tchar *fs_source_path;
 182         tchar *wim_target_path;
 183         struct wim_inode_table inode_table;
 184         struct sd_set sd_set;
 185         struct wim_image_metadata *imd;
 186         struct list_head unhashed_streams;
 187         struct add_image_params params;
 188         int (*capture_tree)(struct wim_dentry **,
 189                             const tchar *,
 190                             struct add_image_params *);
 191         union wimlib_progress_info progress;
 192         struct wimlib_capture_config *config;
 193 #ifdef WITH_NTFS_3G
 194         struct _ntfs_volume *ntfs_vol = NULL;
 195 #endif
 196         void *extra_arg;
 197         struct wim_dentry *branch;
 198         bool rollback_sd = true;
 199
 200         wimlib_assert(add_cmd->op == WIMLIB_UPDATE_OP_ADD);
 201         add_flags = add_cmd->add.add_flags;
 202         fs_source_path = add_cmd->add.fs_source_path;
 203         wim_target_path = add_cmd->add.wim_target_path;
 204         config = add_cmd->add.config;
 205         DEBUG("fs_source_path=\"%"TS"\", wim_target_path=\"%"TS"\", add_flags=%#x",
 206               fs_source_path, wim_target_path, add_flags);
 207
 208         imd = wim->image_metadata[wim->current_image - 1];
 209
 210         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_NTFS) {
 211         #ifdef WITH_NTFS_3G
 212                 capture_tree = build_dentry_tree_ntfs;
 213                 extra_arg = &ntfs_vol;
 214                 if (imd->ntfs_vol != NULL) {
 215                         ERROR("NTFS volume already set");
 216                         ret = WIMLIB_ERR_INVALID_PARAM;
 217                         goto out;
 218                 }
 219         #else
 220                 ret = WIMLIB_ERR_INVALID_PARAM;
 221                 goto out;
 222         #endif
 223         } else {
 224         #ifdef __WIN32__
 225                 capture_tree = win32_build_dentry_tree;
 226         #else
 227                 capture_tree = unix_build_dentry_tree;
 228         #endif
 229                 extra_arg = NULL;
 230         }
 231
 232         ret = init_inode_table(&inode_table, 9001);
 233         if (ret)
 234                 goto out;
 235
 236         ret = init_sd_set(&sd_set, imd->security_data);
 237         if (ret)
 238                 goto out_destroy_inode_table;
 239
 240         INIT_LIST_HEAD(&unhashed_streams);
 241         wim->lookup_table->unhashed_streams = &unhashed_streams;
 242         params.lookup_table = wim->lookup_table;
 243         params.inode_table = &inode_table;
 244         params.sd_set = &sd_set;
 245         params.config = config;
 246         params.add_image_flags = add_flags;
 247         params.progress_func = progress_func;
 248         params.extra_arg = extra_arg;
 249
 250         if (progress_func) {
 251                 memset(&progress, 0, sizeof(progress));
 252                 progress.scan.source = fs_source_path;
 253                 progress.scan.wim_target_path = wim_target_path;
 254                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &progress);
 255         }
 256         config->_prefix = fs_source_path;
 257         config->_prefix_num_tchars = tstrlen(fs_source_path);
 258
 259         if (wim_target_path[0] == T('\0'))
 260                 add_flags |= WIMLIB_ADD_IMAGE_FLAG_ROOT;
 261         ret = (*capture_tree)(&branch, fs_source_path, &params);
 262         if (ret) {
 263                 ERROR("Failed to build dentry tree for \"%"TS"\"",
 264                       fs_source_path);
 265                 goto out_destroy_sd_set;
 266         }
 267         if (branch) {
 268                 /* Use the target name, not the source name, for
 269                  * the root of each branch from a capture
 270                  * source.  (This will also set the root dentry
 271                  * of the entire image to be unnamed.) */
 272                 ret = set_dentry_name(branch,
 273                                       path_basename(wim_target_path));
 274                 if (ret)
 275                         goto out_ntfs_umount;
 276
 277                 ret = attach_branch(&imd->root_dentry, branch, wim_target_path);
 278                 if (ret)
 279                         goto out_ntfs_umount;
 280         }
 281         if (progress_func)
 282                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &progress);
 283         list_splice_tail(&unhashed_streams, &imd->unhashed_streams);
 284 #ifdef WITH_NTFS_3G
 285         imd->ntfs_vol = ntfs_vol;
 286 #endif
 287         inode_table_prepare_inode_list(&inode_table, &imd->inode_list);
 288         ret = 0;
 289         rollback_sd = false;
 290         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_RPFIX)
 291                 wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 292         goto out_destroy_sd_set;
 293 out_ntfs_umount:
 294 #ifdef WITH_NTFS_3G
 295         if (ntfs_vol)
 296                 do_ntfs_umount(ntfs_vol);
 297 #endif
 298         free_dentry_tree(branch, wim->lookup_table);
 299 out_destroy_sd_set:
 300         destroy_sd_set(&sd_set, rollback_sd);
 301 out_destroy_inode_table:
 302         destroy_inode_table(&inode_table);
 303 out:
 304         return ret;
 305 }
 306
 307 static int
 308 execute_delete_command(WIMStruct *wim,
 309                        const struct wimlib_update_command *delete_cmd)
 310 {
 311         int flags;
 312         const tchar *wim_path;
 313         struct wim_dentry *tree;
 314         bool is_root;
 315
 316         wimlib_assert(delete_cmd->op == WIMLIB_UPDATE_OP_DELETE);
 317         flags = delete_cmd->delete.delete_flags;
 318         wim_path = delete_cmd->delete.wim_path;
 319
 320         tree = get_dentry(wim, wim_path);
 321         if (!tree) {
 322                 /* Path to delete does not exist in the WIM. */
 323                 if (flags & WIMLIB_DELETE_FLAG_FORCE) {
 324                         return 0;
 325                 } else {
 326                         ERROR("Path \"%"TS"\" does not exist in WIM image %d",
 327                               wim_path, wim->current_image);
 328                         return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 329                 }
 330         }
 331
 332         if (dentry_is_directory(tree) && !(flags & WIMLIB_DELETE_FLAG_RECURSIVE)) {
 333                 ERROR("Path \"%"TS"\" in WIM image %d is a directory "
 334                       "but a recursive delete was not requested",
 335                       wim_path, wim->current_image);
 336                 return WIMLIB_ERR_IS_DIRECTORY;
 337         }
 338
 339         is_root = dentry_is_root(tree);
 340         unlink_dentry(tree);
 341         free_dentry_tree(tree, wim->lookup_table);
 342         if (is_root)
 343                 wim->image_metadata[wim->current_image - 1]->root_dentry = NULL;
 344         return 0;
 345 }
 346
 347 /*
 348  * Rename a file or directory in the WIM.
 349  *
 350  * This is also called from wimfs_rename() in the FUSE mount code.
 351  */
 352 int
 353 rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to)
 354 {
 355         struct wim_dentry *src;
 356         struct wim_dentry *dst;
 357         struct wim_dentry *parent_of_dst;
 358         int ret;
 359
 360         /* This rename() implementation currently only supports actual files
 361          * (not alternate data streams) */
 362
 363         src = get_dentry(wim, from);
 364         if (!src)
 365                 return -errno;
 366
 367         dst = get_dentry(wim, to);
 368
 369         if (dst) {
 370                 /* Destination file exists */
 371
 372                 if (src == dst) /* Same file */
 373                         return 0;
 374
 375                 if (!dentry_is_directory(src)) {
 376                         /* Cannot rename non-directory to directory. */
 377                         if (dentry_is_directory(dst))
 378                                 return -EISDIR;
 379                 } else {
 380                         /* Cannot rename directory to a non-directory or a non-empty
 381                          * directory */
 382                         if (!dentry_is_directory(dst))
 383                                 return -ENOTDIR;
 384                         if (inode_has_children(dst->d_inode))
 385                                 return -ENOTEMPTY;
 386                 }
 387                 parent_of_dst = dst->parent;
 388         } else {
 389                 /* Destination does not exist */
 390                 parent_of_dst = get_parent_dentry(wim, to);
 391                 if (!parent_of_dst)
 392                         return -errno;
 393
 394                 if (!dentry_is_directory(parent_of_dst))
 395                         return -ENOTDIR;
 396         }
 397
 398         ret = set_dentry_name(src, path_basename(to));
 399         if (ret)
 400                 return -ENOMEM;
 401         if (dst) {
 402                 unlink_dentry(dst);
 403                 free_dentry_tree(dst, wim->lookup_table);
 404         }
 405         unlink_dentry(src);
 406         dentry_add_child(parent_of_dst, src);
 407         return 0;
 408 }
 409
 410
 411 static int
 412 execute_rename_command(WIMStruct *wim,
 413                        const struct wimlib_update_command *rename_cmd)
 414 {
 415         int ret;
 416
 417         wimlib_assert(rename_cmd->op == WIMLIB_UPDATE_OP_RENAME);
 418
 419         ret = rename_wim_path(wim, rename_cmd->rename.wim_source_path,
 420                               rename_cmd->rename.wim_target_path);
 421         if (ret) {
 422                 switch (ret) {
 423                 case -ENOMEM:
 424                         ret = WIMLIB_ERR_NOMEM;
 425                         break;
 426                 case -ENOTDIR:
 427                         ret = WIMLIB_ERR_NOTDIR;
 428                         break;
 429                 case -ENOTEMPTY:
 430                 case -EISDIR:
 431                         ret = WIMLIB_ERR_IS_DIRECTORY;
 432                         break;
 433                 case -ENOENT:
 434                 default:
 435                         ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 436                         break;
 437                 }
 438         }
 439         return ret;
 440 }
 441
 442 static inline const tchar *
 443 update_op_to_str(int op)
 444 {
 445         switch (op) {
 446         case WIMLIB_UPDATE_OP_ADD:
 447                 return T("add");
 448         case WIMLIB_UPDATE_OP_DELETE:
 449                 return T("delete");
 450         case WIMLIB_UPDATE_OP_RENAME:
 451                 return T("rename");
 452         default:
 453                 return T("???");
 454         }
 455 }
 456
 457 static int
 458 execute_update_commands(WIMStruct *wim,
 459                         const struct wimlib_update_command *cmds,
 460                         size_t num_cmds,
 461                         wimlib_progress_func_t progress_func)
 462 {
 463         int ret = 0;
 464         for (size_t i = 0; i < num_cmds; i++) {
 465                 DEBUG("Executing update command %zu of %zu (op=%"TS")",
 466                       i + 1, num_cmds, update_op_to_str(cmds[i].op));
 467                 switch (cmds[i].op) {
 468                 case WIMLIB_UPDATE_OP_ADD:
 469                         ret = execute_add_command(wim, &cmds[i], progress_func);
 470                         break;
 471                 case WIMLIB_UPDATE_OP_DELETE:
 472                         ret = execute_delete_command(wim, &cmds[i]);
 473                         if (ret == 0)
 474                                 wim->deletion_occurred = 1;
 475                         break;
 476                 case WIMLIB_UPDATE_OP_RENAME:
 477                         ret = execute_rename_command(wim, &cmds[i]);
 478                         break;
 479                 default:
 480                         ret = WIMLIB_ERR_INVALID_PARAM;
 481                         break;
 482                 }
 483                 if (ret)
 484                         break;
 485                 wim->image_metadata[wim->current_image - 1]->modified = 1;
 486         }
 487         return ret;
 488 }
 489
 490 static int
 491 check_add_command(struct wimlib_update_command *cmd,
 492                   const struct wim_header *hdr)
 493 {
 494         int add_flags = cmd->add.add_flags;
 495
 496         /* Are we adding the entire image or not?  An empty wim_target_path
 497          * indicates that the tree we're adding is to be placed in the root of
 498          * the image.  We consider this to be capturing the entire image,
 499          * although it could potentially be an overlay on an existing root as
 500          * well. */
 501         bool is_entire_image = cmd->add.wim_target_path[0] == T('\0');
 502
 503 #ifdef __WIN32__
 504         /* Check for flags not supported on Windows */
 505         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_NTFS) {
 506                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 507                 ERROR("we cannot capture a WIM image directly from a NTFS volume");
 508                 return WIMLIB_ERR_UNSUPPORTED;
 509         }
 510         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) {
 511                 ERROR("Capturing UNIX-specific data is not supported on Windows");
 512                 return WIMLIB_ERR_INVALID_PARAM;
 513         }
 514         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE) {
 515                 ERROR("Dereferencing symbolic links is not supported on Windows");
 516                 return WIMLIB_ERR_INVALID_PARAM;
 517         }
 518 #endif
 519
 520         /* VERBOSE implies EXCLUDE_VERBOSE */
 521         if (add_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 522                 add_flags |= WIMLIB_ADD_IMAGE_FLAG_EXCLUDE_VERBOSE;
 523
 524         /* Check for contradictory reparse point fixup flags */
 525         if ((add_flags & (WIMLIB_ADD_IMAGE_FLAG_RPFIX |
 526                           WIMLIB_ADD_IMAGE_FLAG_NORPFIX)) ==
 527                 (WIMLIB_ADD_IMAGE_FLAG_RPFIX |
 528                  WIMLIB_ADD_IMAGE_FLAG_NORPFIX))
 529         {
 530                 ERROR("Cannot specify RPFIX and NORPFIX flags "
 531                       "at the same time!");
 532                 return WIMLIB_ERR_INVALID_PARAM;
 533         }
 534
 535         /* Set default behavior on reparse point fixups if requested */
 536         if ((add_flags & (WIMLIB_ADD_IMAGE_FLAG_RPFIX |
 537                           WIMLIB_ADD_IMAGE_FLAG_NORPFIX)) == 0)
 538         {
 539                 /* Do reparse-point fixups by default if we are capturing an
 540                  * entire image and either the header flag is set from previous
 541                  * images, or if this is the first image being added. */
 542                 if (is_entire_image &&
 543                     ((hdr->flags & WIM_HDR_FLAG_RP_FIX) || hdr->image_count == 1))
 544                         add_flags |= WIMLIB_ADD_IMAGE_FLAG_RPFIX;
 545         }
 546
 547         if (!is_entire_image) {
 548                 if (add_flags & WIMLIB_ADD_IMAGE_FLAG_NTFS) {
 549                         ERROR("Cannot add directly from a NTFS volume "
 550                               "when not capturing a full image!");
 551                         return WIMLIB_ERR_INVALID_PARAM;
 552                 }
 553
 554                 if (add_flags & WIMLIB_ADD_IMAGE_FLAG_RPFIX) {
 555                         ERROR("Cannot do reparse point fixups when "
 556                               "not capturing a full image!");
 557                         return WIMLIB_ERR_INVALID_PARAM;
 558                 }
 559         }
 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->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         /* Statistics about the WIM image, such as the numbers of files and
 736          * directories, may have changed.  Call xml_update_image_info() to
 737          * recalculate these statistics. */
 738         xml_update_image_info(wim, wim->current_image);
 739 out_free_cmds_copy:
 740         free_update_commands(cmds_copy, num_cmds);
 741 out:
 742         return ret;
 743 }