2 * update_image.c - Update a WIM image.
6 * Copyright (C) 2013 Eric Biggers
8 * This file is part of wimlib, a library for working with WIM files.
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)
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
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/.
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"
34 # include "wimlib/ntfs_3g.h" /* for do_ntfs_umount() */
36 #include "wimlib/paths.h"
37 #include "wimlib/xml.h"
41 /* Overlays @branch onto @target, both of which must be directories. */
43 do_overlay(struct wim_dentry *target, struct wim_dentry *branch)
45 struct rb_root *rb_root;
47 DEBUG("Doing overlay \"%"WS"\" => \"%"WS"\"",
48 branch->file_name, target->file_name);
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;
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;
62 /* Move @child to the directory @target */
64 existing = dentry_add_child(target, child);
66 /* File or directory with same name already exists */
69 ret = do_overlay(existing, child);
71 /* Overlay failed. Revert the changes. */
72 dentry_add_child(branch, child);
73 list_for_each_entry(child, &moved_children, tmp_list)
76 dentry_add_child(branch, child);
81 list_add(&child->tmp_list, &moved_children);
88 /* Attach or overlay a branch onto the WIM image.
91 * Pointer to the root of the WIM image, or pointer to NULL if it has not
96 * Path in the WIM image to add the branch, with leading and trailing
100 attach_branch(struct wim_dentry **root_p, struct wim_dentry *branch,
101 tchar *target_path, CASE_SENSITIVITY_TYPE case_type)
104 struct wim_dentry *dentry, *parent, *target;
107 DEBUG("Attaching branch \"%"WS"\" => \"%"TS"\"",
108 branch->file_name, target_path);
110 if (*target_path == T('\0')) {
111 /* Target: root directory */
113 /* Overlay on existing root */
114 return do_overlay(*root_p, branch);
116 if (!dentry_is_directory(branch)) {
117 ERROR("Cannot set non-directory as root of WIM image");
118 return WIMLIB_ERR_NOTDIR;
126 /* Adding a non-root branch. Create root if it hasn't been created
129 ret = new_filler_directory(T(""), root_p);
134 /* Walk the path to the branch, creating filler directories as needed.
137 while ((slash = tstrchr(target_path, WIM_PATH_SEPARATOR))) {
139 dentry = get_dentry_child_with_name(parent, target_path,
142 ret = new_filler_directory(target_path, &dentry);
145 dentry_add_child(parent, dentry);
149 /* Skip over slashes. Note: this cannot overrun the length of
150 * the string because the last character cannot be a slash, as
151 * trailing slashes were tripped. */
154 } while (*target_path == WIM_PATH_SEPARATOR);
157 /* If the target path already existed, overlay the branch onto it.
158 * Otherwise, set the branch as the target path. */
159 target = get_dentry_child_with_utf16le_name(parent, branch->file_name,
160 branch->file_name_nbytes,
163 return do_overlay(target, branch);
165 dentry_add_child(parent, branch);
171 execute_add_command(WIMStruct *wim,
172 const struct wimlib_update_command *add_cmd,
173 wimlib_progress_func_t progress_func)
177 tchar *fs_source_path;
178 tchar *wim_target_path;
179 struct wim_image_metadata *imd;
180 struct list_head unhashed_streams;
181 struct add_image_params params;
182 int (*capture_tree)(struct wim_dentry **,
184 struct add_image_params *);
185 struct wimlib_capture_config *config;
187 struct _ntfs_volume *ntfs_vol = NULL;
190 struct wim_dentry *branch;
191 bool rollback_sd = true;
193 wimlib_assert(add_cmd->op == WIMLIB_UPDATE_OP_ADD);
195 add_flags = add_cmd->add.add_flags;
196 fs_source_path = add_cmd->add.fs_source_path;
197 wim_target_path = add_cmd->add.wim_target_path;
198 config = add_cmd->add.config;
199 DEBUG("fs_source_path=\"%"TS"\", wim_target_path=\"%"TS"\", add_flags=%#x",
200 fs_source_path, wim_target_path, add_flags);
202 memset(¶ms, 0, sizeof(params));
204 imd = wim->image_metadata[wim->current_image - 1];
206 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
208 capture_tree = build_dentry_tree_ntfs;
209 extra_arg = &ntfs_vol;
210 if (imd->ntfs_vol != NULL) {
211 ERROR("NTFS volume already set");
212 ret = WIMLIB_ERR_INVALID_PARAM;
216 ret = WIMLIB_ERR_INVALID_PARAM;
221 capture_tree = win32_build_dentry_tree;
223 capture_tree = unix_build_dentry_tree;
229 ret = init_inode_table(¶ms.inode_table, 9001);
233 ret = init_sd_set(¶ms.sd_set, imd->security_data);
235 goto out_destroy_inode_table;
237 INIT_LIST_HEAD(&unhashed_streams);
238 wim->lookup_table->unhashed_streams = &unhashed_streams;
239 params.lookup_table = wim->lookup_table;
240 params.config = config;
241 params.add_flags = add_flags;
242 params.extra_arg = extra_arg;
244 params.progress_func = progress_func;
245 params.progress.scan.source = fs_source_path;
246 params.progress.scan.wim_target_path = wim_target_path;
248 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, ¶ms.progress);
250 config->_prefix = fs_source_path;
251 config->_prefix_num_tchars = tstrlen(fs_source_path);
254 if (wim_target_path[0] == T('\0'))
255 params.add_flags |= WIMLIB_ADD_FLAG_ROOT;
256 ret = (*capture_tree)(&branch, fs_source_path, ¶ms);
258 goto out_destroy_sd_set;
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));
268 goto out_ntfs_umount;
270 ret = attach_branch(&imd->root_dentry, branch, wim_target_path,
271 WIMLIB_CASE_PLATFORM_DEFAULT);
273 goto out_ntfs_umount;
276 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, ¶ms.progress);
277 list_splice_tail(&unhashed_streams, &imd->unhashed_streams);
279 imd->ntfs_vol = ntfs_vol;
281 inode_table_prepare_inode_list(¶ms.inode_table, &imd->inode_list);
284 if (add_flags & WIMLIB_ADD_FLAG_RPFIX)
285 wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
286 goto out_destroy_sd_set;
290 do_ntfs_umount(ntfs_vol);
292 free_dentry_tree(branch, wim->lookup_table);
294 destroy_sd_set(¶ms.sd_set, rollback_sd);
295 out_destroy_inode_table:
296 destroy_inode_table(¶ms.inode_table);
302 execute_delete_command(WIMStruct *wim,
303 const struct wimlib_update_command *delete_cmd)
306 const tchar *wim_path;
307 struct wim_dentry *tree;
310 wimlib_assert(delete_cmd->op == WIMLIB_UPDATE_OP_DELETE);
311 flags = delete_cmd->delete_.delete_flags;
312 wim_path = delete_cmd->delete_.wim_path;
314 DEBUG("Deleting WIM path \"%"TS"\" (flags=%#x)", wim_path, flags);
316 tree = get_dentry(wim, wim_path, WIMLIB_CASE_PLATFORM_DEFAULT);
318 /* Path to delete does not exist in the WIM. */
319 if (flags & WIMLIB_DELETE_FLAG_FORCE) {
322 ERROR("Path \"%"TS"\" does not exist in WIM image %d",
323 wim_path, wim->current_image);
324 return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
328 if (dentry_is_directory(tree) && !(flags & WIMLIB_DELETE_FLAG_RECURSIVE)) {
329 ERROR("Path \"%"TS"\" in WIM image %d is a directory "
330 "but a recursive delete was not requested",
331 wim_path, wim->current_image);
332 return WIMLIB_ERR_IS_DIRECTORY;
335 is_root = dentry_is_root(tree);
337 free_dentry_tree(tree, wim->lookup_table);
339 wim->image_metadata[wim->current_image - 1]->root_dentry = NULL;
344 execute_rename_command(WIMStruct *wim,
345 const struct wimlib_update_command *rename_cmd)
349 wimlib_assert(rename_cmd->op == WIMLIB_UPDATE_OP_RENAME);
351 ret = rename_wim_path(wim, rename_cmd->rename.wim_source_path,
352 rename_cmd->rename.wim_target_path,
353 WIMLIB_CASE_PLATFORM_DEFAULT);
357 ERROR_WITH_ERRNO("Can't rename \"%"TS"\" to \"%"TS"\"",
358 rename_cmd->rename.wim_source_path,
359 rename_cmd->rename.wim_target_path);
362 ret = WIMLIB_ERR_NOMEM;
365 ret = WIMLIB_ERR_NOTDIR;
368 ret = WIMLIB_ERR_NOTEMPTY;
371 ret = WIMLIB_ERR_IS_DIRECTORY;
375 ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
382 static inline const tchar *
383 update_op_to_str(int op)
386 case WIMLIB_UPDATE_OP_ADD:
388 case WIMLIB_UPDATE_OP_DELETE:
390 case WIMLIB_UPDATE_OP_RENAME:
399 execute_update_commands(WIMStruct *wim,
400 const struct wimlib_update_command *cmds,
403 wimlib_progress_func_t progress_func)
406 union wimlib_progress_info info;
407 info.update.completed_commands = 0;
408 info.update.total_commands = num_cmds;
409 for (size_t i = 0; i < num_cmds; i++) {
410 DEBUG("Executing update command %zu of %zu (op=%"TS")",
411 i + 1, num_cmds, update_op_to_str(cmds[i].op));
412 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
415 info.update.command = &cmds[i];
416 (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_BEGIN_COMMAND,
419 switch (cmds[i].op) {
420 case WIMLIB_UPDATE_OP_ADD:
421 ret = execute_add_command(wim, &cmds[i], progress_func);
423 case WIMLIB_UPDATE_OP_DELETE:
424 ret = execute_delete_command(wim, &cmds[i]);
426 case WIMLIB_UPDATE_OP_RENAME:
427 ret = execute_rename_command(wim, &cmds[i]);
434 info.update.completed_commands++;
435 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
438 (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_END_COMMAND,
450 T("/System Volume Information"),
455 static const struct wimlib_capture_config winconfig = {
457 .num_pats = ARRAY_LEN(winpats),
463 check_add_command(struct wimlib_update_command *cmd,
464 const struct wim_header *hdr)
466 int add_flags = cmd->add.add_flags;
468 /* Are we adding the entire image or not? An empty wim_target_path
469 * indicates that the tree we're adding is to be placed in the root of
470 * the image. We consider this to be capturing the entire image,
471 * although it could potentially be an overlay on an existing root as
473 bool is_entire_image = cmd->add.wim_target_path[0] == T('\0');
476 /* Check for flags not supported on Windows */
477 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
478 ERROR("wimlib was compiled without support for NTFS-3g, so");
479 ERROR("we cannot capture a WIM image directly from a NTFS volume");
480 return WIMLIB_ERR_UNSUPPORTED;
482 if (add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
483 ERROR("Capturing UNIX-specific data is not supported on Windows");
484 return WIMLIB_ERR_UNSUPPORTED;
486 if (add_flags & WIMLIB_ADD_FLAG_DEREFERENCE) {
487 ERROR("Dereferencing symbolic links is not supported on Windows");
488 return WIMLIB_ERR_UNSUPPORTED;
492 /* VERBOSE implies EXCLUDE_VERBOSE */
493 if (add_flags & WIMLIB_ADD_FLAG_VERBOSE)
494 add_flags |= WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE;
496 /* Check for contradictory reparse point fixup flags */
497 if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
498 WIMLIB_ADD_FLAG_NORPFIX)) ==
499 (WIMLIB_ADD_FLAG_RPFIX |
500 WIMLIB_ADD_FLAG_NORPFIX))
502 ERROR("Cannot specify RPFIX and NORPFIX flags "
503 "at the same time!");
504 return WIMLIB_ERR_INVALID_PARAM;
507 /* Set default behavior on reparse point fixups if requested */
508 if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
509 WIMLIB_ADD_FLAG_NORPFIX)) == 0)
511 /* Do reparse-point fixups by default if we are capturing an
512 * entire image and either the header flag is set from previous
513 * images, or if this is the first image being added. */
514 if (is_entire_image &&
515 ((hdr->flags & WIM_HDR_FLAG_RP_FIX) || hdr->image_count == 1))
516 add_flags |= WIMLIB_ADD_FLAG_RPFIX;
519 if (!is_entire_image) {
520 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
521 ERROR("Cannot add directly from a NTFS volume "
522 "when not capturing a full image!");
523 return WIMLIB_ERR_INVALID_PARAM;
526 if (add_flags & WIMLIB_ADD_FLAG_RPFIX) {
527 ERROR("Cannot do reparse point fixups when "
528 "not capturing a full image!");
529 return WIMLIB_ERR_INVALID_PARAM;
532 /* We may have modified the add flags. */
533 cmd->add.add_flags = add_flags;
538 check_update_command(struct wimlib_update_command *cmd,
539 const struct wim_header *hdr)
542 case WIMLIB_UPDATE_OP_ADD:
543 return check_add_command(cmd, hdr);
544 case WIMLIB_UPDATE_OP_DELETE:
545 case WIMLIB_UPDATE_OP_RENAME:
552 check_update_commands(struct wimlib_update_command *cmds, size_t num_cmds,
553 const struct wim_header *hdr)
556 for (size_t i = 0; i < num_cmds; i++) {
557 ret = check_update_command(&cmds[i], hdr);
566 free_update_commands(struct wimlib_update_command *cmds, size_t num_cmds)
569 for (size_t i = 0; i < num_cmds; i++) {
570 switch (cmds[i].op) {
571 case WIMLIB_UPDATE_OP_ADD:
572 FREE(cmds[i].add.fs_source_path);
573 FREE(cmds[i].add.wim_target_path);
574 free_capture_config(cmds[i].add.config);
576 case WIMLIB_UPDATE_OP_DELETE:
577 FREE(cmds[i].delete_.wim_path);
579 case WIMLIB_UPDATE_OP_RENAME:
580 FREE(cmds[i].rename.wim_source_path);
581 FREE(cmds[i].rename.wim_target_path);
590 copy_update_commands(const struct wimlib_update_command *cmds,
592 struct wimlib_update_command **cmds_copy_ret)
595 struct wimlib_update_command *cmds_copy;
596 const struct wimlib_capture_config *config;
598 cmds_copy = CALLOC(num_cmds, sizeof(cmds[0]));
602 for (size_t i = 0; i < num_cmds; i++) {
603 cmds_copy[i].op = cmds[i].op;
604 switch (cmds[i].op) {
605 case WIMLIB_UPDATE_OP_ADD:
606 cmds_copy[i].add.fs_source_path =
607 canonicalize_fs_path(cmds[i].add.fs_source_path);
608 cmds_copy[i].add.wim_target_path =
609 canonicalize_wim_path(cmds[i].add.wim_target_path);
610 if (!cmds_copy[i].add.fs_source_path ||
611 !cmds_copy[i].add.wim_target_path)
613 config = cmds[i].add.config;
614 if (cmds[i].add.add_flags & WIMLIB_ADD_FLAG_WINCONFIG)
617 ret = copy_and_canonicalize_capture_config(config,
618 &cmds_copy[i].add.config);
622 cmds_copy[i].add.add_flags = cmds[i].add.add_flags;
624 case WIMLIB_UPDATE_OP_DELETE:
625 cmds_copy[i].delete_.wim_path =
626 canonicalize_wim_path(cmds[i].delete_.wim_path);
627 if (!cmds_copy[i].delete_.wim_path)
629 cmds_copy[i].delete_.delete_flags = cmds[i].delete_.delete_flags;
631 case WIMLIB_UPDATE_OP_RENAME:
632 cmds_copy[i].rename.wim_source_path =
633 canonicalize_wim_path(cmds[i].rename.wim_source_path);
634 cmds_copy[i].rename.wim_target_path =
635 canonicalize_wim_path(cmds[i].rename.wim_target_path);
636 if (!cmds_copy[i].rename.wim_source_path ||
637 !cmds_copy[i].rename.wim_target_path)
641 ERROR("Unknown update operation %u", cmds[i].op);
642 ret = WIMLIB_ERR_INVALID_PARAM;
646 *cmds_copy_ret = cmds_copy;
651 ret = WIMLIB_ERR_NOMEM;
653 free_update_commands(cmds_copy, num_cmds);
657 /* API function documented in wimlib.h */
659 wimlib_update_image(WIMStruct *wim,
661 const struct wimlib_update_command *cmds,
664 wimlib_progress_func_t progress_func)
667 struct wimlib_update_command *cmds_copy;
668 bool deletion_requested = false;
670 DEBUG("Updating image %d with %zu commands", image, num_cmds);
672 for (size_t i = 0; i < num_cmds; i++)
673 if (cmds[i].op == WIMLIB_UPDATE_OP_DELETE)
674 deletion_requested = true;
676 if (deletion_requested)
677 ret = can_delete_from_wim(wim);
679 ret = can_modify_wim(wim);
684 /* Load the metadata for the image to modify (if not loaded already) */
685 ret = select_wim_image(wim, image);
689 /* Short circuit a successful return if no commands were specified.
690 * Avoids problems with trying to allocate 0 bytes of memory. */
694 DEBUG("Preparing %zu update commands", num_cmds);
696 /* Make a copy of the update commands, in the process doing certain
697 * canonicalizations on paths (e.g. translating backslashes to forward
698 * slashes). This is done to avoid modifying the caller's copy of the
700 ret = copy_update_commands(cmds, num_cmds, &cmds_copy);
704 /* Perform additional checks on the update commands before we execute
706 ret = check_update_commands(cmds_copy, num_cmds, &wim->hdr);
708 goto out_free_cmds_copy;
710 /* Actually execute the update commands. */
711 DEBUG("Executing %zu update commands", num_cmds);
712 ret = execute_update_commands(wim, cmds_copy, num_cmds, update_flags,
715 goto out_free_cmds_copy;
717 wim->image_metadata[image - 1]->modified = 1;
719 /* Statistics about the WIM image, such as the numbers of files and
720 * directories, may have changed. Call xml_update_image_info() to
721 * recalculate these statistics. */
722 xml_update_image_info(wim, image);
724 free_update_commands(cmds_copy, num_cmds);