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, WIM_PATH_SEPARATOR))) {
 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 == WIM_PATH_SEPARATOR);
 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         struct wimlib_capture_config *config;
 184 #ifdef WITH_NTFS_3G
 185         struct _ntfs_volume *ntfs_vol = NULL;
 186 #endif
 187         void *extra_arg;
 188         struct wim_dentry *branch;
 189         bool rollback_sd = true;
 190
 191         wimlib_assert(add_cmd->op == WIMLIB_UPDATE_OP_ADD);
 192
 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         memset(&params, 0, sizeof(params));
 201
 202         imd = wim->image_metadata[wim->current_image - 1];
 203
 204         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 205         #ifdef WITH_NTFS_3G
 206                 capture_tree = build_dentry_tree_ntfs;
 207                 extra_arg = &ntfs_vol;
 208                 if (imd->ntfs_vol != NULL) {
 209                         ERROR("NTFS volume already set");
 210                         ret = WIMLIB_ERR_INVALID_PARAM;
 211                         goto out;
 212                 }
 213         #else
 214                 ret = WIMLIB_ERR_INVALID_PARAM;
 215                 goto out;
 216         #endif
 217         } else {
 218         #ifdef __WIN32__
 219                 capture_tree = win32_build_dentry_tree;
 220         #else
 221                 capture_tree = unix_build_dentry_tree;
 222         #endif
 223                 extra_arg = NULL;
 224         }
 225
 226
 227         ret = init_inode_table(&params.inode_table, 9001);
 228         if (ret)
 229                 goto out;
 230
 231         ret = init_sd_set(&params.sd_set, imd->security_data);
 232         if (ret)
 233                 goto out_destroy_inode_table;
 234
 235         INIT_LIST_HEAD(&unhashed_streams);
 236         wim->lookup_table->unhashed_streams = &unhashed_streams;
 237         params.lookup_table = wim->lookup_table;
 238         params.config = config;
 239         params.add_flags = add_flags;
 240         params.extra_arg = extra_arg;
 241
 242         params.progress_func = progress_func;
 243         params.progress.scan.source = fs_source_path;
 244         params.progress.scan.wim_target_path = wim_target_path;
 245         if (progress_func)
 246                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &params.progress);
 247         if (config) {
 248                 config->_prefix = fs_source_path;
 249                 config->_prefix_num_tchars = tstrlen(fs_source_path);
 250         }
 251
 252         if (wim_target_path[0] == T('\0'))
 253                 params.add_flags |= WIMLIB_ADD_FLAG_ROOT;
 254         ret = (*capture_tree)(&branch, fs_source_path, &params);
 255         if (ret) {
 256                 ERROR("Failed to build dentry tree for \"%"TS"\"",
 257                       fs_source_path);
 258                 goto out_destroy_sd_set;
 259         }
 260         if (branch) {
 261                 /* Use the target name, not the source name, for
 262                  * the root of each branch from a capture
 263                  * source.  (This will also set the root dentry
 264                  * of the entire image to be unnamed.) */
 265                 ret = set_dentry_name(branch,
 266                                       path_basename(wim_target_path));
 267                 if (ret)
 268                         goto out_ntfs_umount;
 269
 270                 ret = attach_branch(&imd->root_dentry, branch, wim_target_path);
 271                 if (ret)
 272                         goto out_ntfs_umount;
 273         }
 274         if (progress_func)
 275                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &params.progress);
 276         list_splice_tail(&unhashed_streams, &imd->unhashed_streams);
 277 #ifdef WITH_NTFS_3G
 278         imd->ntfs_vol = ntfs_vol;
 279 #endif
 280         inode_table_prepare_inode_list(&params.inode_table, &imd->inode_list);
 281         ret = 0;
 282         rollback_sd = false;
 283         if (add_flags & WIMLIB_ADD_FLAG_RPFIX)
 284                 wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 285         goto out_destroy_sd_set;
 286 out_ntfs_umount:
 287 #ifdef WITH_NTFS_3G
 288         if (ntfs_vol)
 289                 do_ntfs_umount(ntfs_vol);
 290 #endif
 291         free_dentry_tree(branch, wim->lookup_table);
 292 out_destroy_sd_set:
 293         destroy_sd_set(&params.sd_set, rollback_sd);
 294 out_destroy_inode_table:
 295         destroy_inode_table(&params.inode_table);
 296 out:
 297         return ret;
 298 }
 299
 300 static int
 301 execute_delete_command(WIMStruct *wim,
 302                        const struct wimlib_update_command *delete_cmd)
 303 {
 304         int flags;
 305         const tchar *wim_path;
 306         struct wim_dentry *tree;
 307         bool is_root;
 308
 309         wimlib_assert(delete_cmd->op == WIMLIB_UPDATE_OP_DELETE);
 310         flags = delete_cmd->delete.delete_flags;
 311         wim_path = delete_cmd->delete.wim_path;
 312
 313         DEBUG("Deleting WIM path \"%"TS"\" (flags=%#x)", wim_path, flags);
 314
 315         tree = get_dentry(wim, wim_path);
 316         if (!tree) {
 317                 /* Path to delete does not exist in the WIM. */
 318                 if (flags & WIMLIB_DELETE_FLAG_FORCE) {
 319                         return 0;
 320                 } else {
 321                         ERROR("Path \"%"TS"\" does not exist in WIM image %d",
 322                               wim_path, wim->current_image);
 323                         return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 324                 }
 325         }
 326
 327         if (dentry_is_directory(tree) && !(flags & WIMLIB_DELETE_FLAG_RECURSIVE)) {
 328                 ERROR("Path \"%"TS"\" in WIM image %d is a directory "
 329                       "but a recursive delete was not requested",
 330                       wim_path, wim->current_image);
 331                 return WIMLIB_ERR_IS_DIRECTORY;
 332         }
 333
 334         is_root = dentry_is_root(tree);
 335         unlink_dentry(tree);
 336         free_dentry_tree(tree, wim->lookup_table);
 337         if (is_root)
 338                 wim->image_metadata[wim->current_image - 1]->root_dentry = NULL;
 339         return 0;
 340 }
 341
 342 static int
 343 free_dentry_full_path(struct wim_dentry *dentry, void *_ignore)
 344 {
 345         FREE(dentry->_full_path);
 346         dentry->_full_path = NULL;
 347         return 0;
 348 }
 349
 350 /*
 351  * Rename a file or directory in the WIM.
 352  *
 353  * This is also called from wimfs_rename() in the FUSE mount code.
 354  */
 355 int
 356 rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to)
 357 {
 358         struct wim_dentry *src;
 359         struct wim_dentry *dst;
 360         struct wim_dentry *parent_of_dst;
 361         int ret;
 362
 363         /* This rename() implementation currently only supports actual files
 364          * (not alternate data streams) */
 365
 366         src = get_dentry(wim, from);
 367         if (!src)
 368                 return -errno;
 369
 370         dst = get_dentry(wim, to);
 371
 372         if (dst) {
 373                 /* Destination file exists */
 374
 375                 if (src == dst) /* Same file */
 376                         return 0;
 377
 378                 if (!dentry_is_directory(src)) {
 379                         /* Cannot rename non-directory to directory. */
 380                         if (dentry_is_directory(dst))
 381                                 return -EISDIR;
 382                 } else {
 383                         /* Cannot rename directory to a non-directory or a non-empty
 384                          * directory */
 385                         if (!dentry_is_directory(dst))
 386                                 return -ENOTDIR;
 387                         if (inode_has_children(dst->d_inode))
 388                                 return -ENOTEMPTY;
 389                 }
 390                 parent_of_dst = dst->parent;
 391         } else {
 392                 /* Destination does not exist */
 393                 parent_of_dst = get_parent_dentry(wim, to);
 394                 if (!parent_of_dst)
 395                         return -errno;
 396
 397                 if (!dentry_is_directory(parent_of_dst))
 398                         return -ENOTDIR;
 399         }
 400
 401         ret = set_dentry_name(src, path_basename(to));
 402         if (ret)
 403                 return -ENOMEM;
 404         if (dst) {
 405                 unlink_dentry(dst);
 406                 free_dentry_tree(dst, wim->lookup_table);
 407         }
 408         unlink_dentry(src);
 409         dentry_add_child(parent_of_dst, src);
 410         if (src->_full_path)
 411                 for_dentry_in_tree(src, free_dentry_full_path, NULL);
 412         return 0;
 413 }
 414
 415
 416 static int
 417 execute_rename_command(WIMStruct *wim,
 418                        const struct wimlib_update_command *rename_cmd)
 419 {
 420         int ret;
 421
 422         wimlib_assert(rename_cmd->op == WIMLIB_UPDATE_OP_RENAME);
 423
 424         ret = rename_wim_path(wim, rename_cmd->rename.wim_source_path,
 425                               rename_cmd->rename.wim_target_path);
 426         if (ret) {
 427                 ret = -ret;
 428                 errno = ret;
 429                 ERROR_WITH_ERRNO("Can't rename \"%"TS"\" to \"%"TS"\"",
 430                                  rename_cmd->rename.wim_source_path,
 431                                  rename_cmd->rename.wim_target_path);
 432                 switch (ret) {
 433                 case ENOMEM:
 434                         ret = WIMLIB_ERR_NOMEM;
 435                         break;
 436                 case ENOTDIR:
 437                         ret = WIMLIB_ERR_NOTDIR;
 438                         break;
 439                 case ENOTEMPTY:
 440                         ret = WIMLIB_ERR_NOTEMPTY;
 441                         break;
 442                 case EISDIR:
 443                         ret = WIMLIB_ERR_IS_DIRECTORY;
 444                         break;
 445                 case ENOENT:
 446                 default:
 447                         ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 448                         break;
 449                 }
 450         }
 451         return ret;
 452 }
 453
 454 static inline const tchar *
 455 update_op_to_str(int op)
 456 {
 457         switch (op) {
 458         case WIMLIB_UPDATE_OP_ADD:
 459                 return T("add");
 460         case WIMLIB_UPDATE_OP_DELETE:
 461                 return T("delete");
 462         case WIMLIB_UPDATE_OP_RENAME:
 463                 return T("rename");
 464         default:
 465                 wimlib_assert(0);
 466                 return NULL;
 467         }
 468 }
 469
 470 static int
 471 execute_update_commands(WIMStruct *wim,
 472                         const struct wimlib_update_command *cmds,
 473                         size_t num_cmds,
 474                         int update_flags,
 475                         wimlib_progress_func_t progress_func)
 476 {
 477         int ret = 0;
 478         union wimlib_progress_info info;
 479         info.update.completed_commands = 0;
 480         info.update.total_commands = num_cmds;
 481         for (size_t i = 0; i < num_cmds; i++) {
 482                 DEBUG("Executing update command %zu of %zu (op=%"TS")",
 483                       i + 1, num_cmds, update_op_to_str(cmds[i].op));
 484                 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
 485                     progress_func)
 486                 {
 487                         info.update.command = &cmds[i];
 488                         (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_BEGIN_COMMAND,
 489                                          &info);
 490                 }
 491                 switch (cmds[i].op) {
 492                 case WIMLIB_UPDATE_OP_ADD:
 493                         ret = execute_add_command(wim, &cmds[i], progress_func);
 494                         break;
 495                 case WIMLIB_UPDATE_OP_DELETE:
 496                         ret = execute_delete_command(wim, &cmds[i]);
 497                         break;
 498                 case WIMLIB_UPDATE_OP_RENAME:
 499                         ret = execute_rename_command(wim, &cmds[i]);
 500                         break;
 501                 default:
 502                         wimlib_assert(0);
 503                 }
 504                 if (ret)
 505                         break;
 506                 info.update.completed_commands++;
 507                 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
 508                     progress_func)
 509                 {
 510                         (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_END_COMMAND,
 511                                          &info);
 512                 }
 513         }
 514         return ret;
 515 }
 516
 517
 518 tchar *winpats[] = {
 519         T("/$ntfs.log"),
 520         T("/hiberfil.sys"),
 521         T("/pagefile.sys"),
 522         T("/System Volume Information"),
 523         T("/RECYCLER"),
 524         T("/Windows/CSC"),
 525 };
 526
 527 static const struct wimlib_capture_config winconfig = {
 528         .exclusion_pats = {
 529                 .num_pats = ARRAY_LEN(winpats),
 530                 .pats = winpats,
 531         },
 532 };
 533
 534 static int
 535 check_add_command(struct wimlib_update_command *cmd,
 536                   const struct wim_header *hdr)
 537 {
 538         int add_flags = cmd->add.add_flags;
 539
 540         /* Are we adding the entire image or not?  An empty wim_target_path
 541          * indicates that the tree we're adding is to be placed in the root of
 542          * the image.  We consider this to be capturing the entire image,
 543          * although it could potentially be an overlay on an existing root as
 544          * well. */
 545         bool is_entire_image = cmd->add.wim_target_path[0] == T('\0');
 546
 547 #ifdef __WIN32__
 548         /* Check for flags not supported on Windows */
 549         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 550                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 551                 ERROR("we cannot capture a WIM image directly from a NTFS volume");
 552                 return WIMLIB_ERR_UNSUPPORTED;
 553         }
 554         if (add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
 555                 ERROR("Capturing UNIX-specific data is not supported on Windows");
 556                 return WIMLIB_ERR_UNSUPPORTED;
 557         }
 558         if (add_flags & WIMLIB_ADD_FLAG_DEREFERENCE) {
 559                 ERROR("Dereferencing symbolic links is not supported on Windows");
 560                 return WIMLIB_ERR_UNSUPPORTED;
 561         }
 562 #endif
 563
 564         /* VERBOSE implies EXCLUDE_VERBOSE */
 565         if (add_flags & WIMLIB_ADD_FLAG_VERBOSE)
 566                 add_flags |= WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE;
 567
 568         /* Check for contradictory reparse point fixup flags */
 569         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 570                           WIMLIB_ADD_FLAG_NORPFIX)) ==
 571                 (WIMLIB_ADD_FLAG_RPFIX |
 572                  WIMLIB_ADD_FLAG_NORPFIX))
 573         {
 574                 ERROR("Cannot specify RPFIX and NORPFIX flags "
 575                       "at the same time!");
 576                 return WIMLIB_ERR_INVALID_PARAM;
 577         }
 578
 579         /* Set default behavior on reparse point fixups if requested */
 580         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
 581                           WIMLIB_ADD_FLAG_NORPFIX)) == 0)
 582         {
 583                 /* Do reparse-point fixups by default if we are capturing an
 584                  * entire image and either the header flag is set from previous
 585                  * images, or if this is the first image being added. */
 586                 if (is_entire_image &&
 587                     ((hdr->flags & WIM_HDR_FLAG_RP_FIX) || hdr->image_count == 1))
 588                         add_flags |= WIMLIB_ADD_FLAG_RPFIX;
 589         }
 590
 591         if (!is_entire_image) {
 592                 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 593                         ERROR("Cannot add directly from a NTFS volume "
 594                               "when not capturing a full image!");
 595                         return WIMLIB_ERR_INVALID_PARAM;
 596                 }
 597
 598                 if (add_flags & WIMLIB_ADD_FLAG_RPFIX) {
 599                         ERROR("Cannot do reparse point fixups when "
 600                               "not capturing a full image!");
 601                         return WIMLIB_ERR_INVALID_PARAM;
 602                 }
 603         }
 604         /* We may have modified the add flags. */
 605         cmd->add.add_flags = add_flags;
 606         return 0;
 607 }
 608
 609 static int
 610 check_update_command(struct wimlib_update_command *cmd,
 611                      const struct wim_header *hdr)
 612 {
 613         switch (cmd->op) {
 614         case WIMLIB_UPDATE_OP_ADD:
 615                 return check_add_command(cmd, hdr);
 616         case WIMLIB_UPDATE_OP_DELETE:
 617         case WIMLIB_UPDATE_OP_RENAME:
 618                 break;
 619         }
 620         return 0;
 621 }
 622
 623 static int
 624 check_update_commands(struct wimlib_update_command *cmds, size_t num_cmds,
 625                       const struct wim_header *hdr)
 626 {
 627         int ret = 0;
 628         for (size_t i = 0; i < num_cmds; i++) {
 629                 ret = check_update_command(&cmds[i], hdr);
 630                 if (ret)
 631                         break;
 632         }
 633         return ret;
 634 }
 635
 636
 637 static void
 638 free_update_commands(struct wimlib_update_command *cmds, size_t num_cmds)
 639 {
 640         if (cmds) {
 641                 for (size_t i = 0; i < num_cmds; i++) {
 642                         switch (cmds[i].op) {
 643                         case WIMLIB_UPDATE_OP_ADD:
 644                                 FREE(cmds[i].add.fs_source_path);
 645                                 FREE(cmds[i].add.wim_target_path);
 646                                 free_capture_config(cmds[i].add.config);
 647                                 break;
 648                         case WIMLIB_UPDATE_OP_DELETE:
 649                                 FREE(cmds[i].delete.wim_path);
 650                                 break;
 651                         case WIMLIB_UPDATE_OP_RENAME:
 652                                 FREE(cmds[i].rename.wim_source_path);
 653                                 FREE(cmds[i].rename.wim_target_path);
 654                                 break;
 655                         }
 656                 }
 657                 FREE(cmds);
 658         }
 659 }
 660
 661 static int
 662 copy_update_commands(const struct wimlib_update_command *cmds,
 663                      size_t num_cmds,
 664                      struct wimlib_update_command **cmds_copy_ret)
 665 {
 666         int ret;
 667         struct wimlib_update_command *cmds_copy;
 668         const struct wimlib_capture_config *config;
 669
 670         cmds_copy = CALLOC(num_cmds, sizeof(cmds[0]));
 671         if (!cmds_copy)
 672                 goto oom;
 673
 674         for (size_t i = 0; i < num_cmds; i++) {
 675                 cmds_copy[i].op = cmds[i].op;
 676                 switch (cmds[i].op) {
 677                 case WIMLIB_UPDATE_OP_ADD:
 678                         cmds_copy[i].add.fs_source_path =
 679                                 canonicalize_fs_path(cmds[i].add.fs_source_path);
 680                         cmds_copy[i].add.wim_target_path =
 681                                 canonicalize_wim_path(cmds[i].add.wim_target_path);
 682                         if (!cmds_copy[i].add.fs_source_path ||
 683                             !cmds_copy[i].add.wim_target_path)
 684                                 goto oom;
 685                         config = cmds[i].add.config;
 686                         if (cmds[i].add.add_flags & WIMLIB_ADD_FLAG_WINCONFIG)
 687                                 config = &winconfig;
 688                         if (config) {
 689                                 ret = copy_and_canonicalize_capture_config(config,
 690                                                                            &cmds_copy[i].add.config);
 691                                 if (ret)
 692                                         goto err;
 693                         }
 694                         cmds_copy[i].add.add_flags = cmds[i].add.add_flags;
 695                         break;
 696                 case WIMLIB_UPDATE_OP_DELETE:
 697                         cmds_copy[i].delete.wim_path =
 698                                 canonicalize_wim_path(cmds[i].delete.wim_path);
 699                         if (!cmds_copy[i].delete.wim_path)
 700                                 goto oom;
 701                         cmds_copy[i].delete.delete_flags = cmds[i].delete.delete_flags;
 702                         break;
 703                 case WIMLIB_UPDATE_OP_RENAME:
 704                         cmds_copy[i].rename.wim_source_path =
 705                                 canonicalize_wim_path(cmds[i].rename.wim_source_path);
 706                         cmds_copy[i].rename.wim_target_path =
 707                                 canonicalize_wim_path(cmds[i].rename.wim_target_path);
 708                         if (!cmds_copy[i].rename.wim_source_path ||
 709                             !cmds_copy[i].rename.wim_target_path)
 710                                 goto oom;
 711                         break;
 712                 default:
 713                         ERROR("Unknown update operation %u", cmds[i].op);
 714                         ret = WIMLIB_ERR_INVALID_PARAM;
 715                         goto err;
 716                 }
 717         }
 718         *cmds_copy_ret = cmds_copy;
 719         ret = 0;
 720 out:
 721         return ret;
 722 oom:
 723         ret = WIMLIB_ERR_NOMEM;
 724 err:
 725         free_update_commands(cmds_copy, num_cmds);
 726         goto out;
 727 }
 728
 729 /* API function documented in wimlib.h  */
 730 WIMLIBAPI int
 731 wimlib_update_image(WIMStruct *wim,
 732                     int image,
 733                     const struct wimlib_update_command *cmds,
 734                     size_t num_cmds,
 735                     int update_flags,
 736                     wimlib_progress_func_t progress_func)
 737 {
 738         int ret;
 739         struct wimlib_update_command *cmds_copy;
 740         bool deletion_requested = false;
 741
 742         DEBUG("Updating image %d with %zu commands", image, num_cmds);
 743
 744         for (size_t i = 0; i < num_cmds; i++)
 745                 if (cmds[i].op == WIMLIB_UPDATE_OP_DELETE)
 746                         deletion_requested = true;
 747
 748         if (deletion_requested)
 749                 ret = can_delete_from_wim(wim);
 750         else
 751                 ret = can_modify_wim(wim);
 752
 753         if (ret)
 754                 goto out;
 755
 756         /* Load the metadata for the image to modify (if not loaded already) */
 757         ret = select_wim_image(wim, image);
 758         if (ret)
 759                 goto out;
 760
 761         /* Short circuit a successful return if no commands were specified.
 762          * Avoids problems with trying to allocate 0 bytes of memory. */
 763         if (num_cmds == 0)
 764                 goto out;
 765
 766         DEBUG("Preparing %zu update commands", num_cmds);
 767
 768         /* Make a copy of the update commands, in the process doing certain
 769          * canonicalizations on paths (e.g. translating backslashes to forward
 770          * slashes).  This is done to avoid modifying the caller's copy of the
 771          * commands. */
 772         ret = copy_update_commands(cmds, num_cmds, &cmds_copy);
 773         if (ret)
 774                 goto out;
 775
 776         /* Perform additional checks on the update commands before we execute
 777          * them. */
 778         ret = check_update_commands(cmds_copy, num_cmds, &wim->hdr);
 779         if (ret)
 780                 goto out_free_cmds_copy;
 781
 782         /* Actually execute the update commands. */
 783         DEBUG("Executing %zu update commands", num_cmds);
 784         ret = execute_update_commands(wim, cmds_copy, num_cmds, update_flags,
 785                                       progress_func);
 786         if (ret)
 787                 goto out_free_cmds_copy;
 788
 789         wim->image_metadata[image - 1]->modified = 1;
 790
 791         /* Statistics about the WIM image, such as the numbers of files and
 792          * directories, may have changed.  Call xml_update_image_info() to
 793          * recalculate these statistics. */
 794         xml_update_image_info(wim, image);
 795 out_free_cmds_copy:
 796         free_update_commands(cmds_copy, num_cmds);
 797 out:
 798         return ret;
 799 }