X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fexport_image.c;h=da638322ee06c32d19217986653be498eea4e63d;hp=6b241f3ae3491d777d80ea4aa7bf36fcd9460f1a;hb=ae7d142ac04cf51ba134750f3338f43af285a433;hpb=10a87017a0a82d34ed3981e1f5e586b5b8613e3f diff --git a/src/export_image.c b/src/export_image.c index 6b241f3a..da638322 100644 --- a/src/export_image.c +++ b/src/export_image.c @@ -3,271 +3,281 @@ */ /* - * Copyright (C) 2012, 2013 Biggers + * Copyright (C) 2012, 2013, 2014, 2015 Eric Biggers * - * This file is part of wimlib, a library for working with WIM files. + * This file is free software; you can redistribute it and/or modify it under + * the terms of the GNU Lesser General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at your option) any + * later version. * - * wimlib is free software; you can redistribute it and/or modify it under the - * terms of the GNU General Public License as published by the Free - * Software Foundation; either version 3 of the License, or (at your option) - * any later version. - * - * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY - * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR - * A PARTICULAR PURPOSE. See the GNU General Public License for more + * This file is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more * details. * - * You should have received a copy of the GNU General Public License - * along with wimlib; if not, see http://www.gnu.org/licenses/. + * You should have received a copy of the GNU Lesser General Public License + * along with this file; if not, see http://www.gnu.org/licenses/. */ -#include "wimlib_internal.h" -#include "dentry.h" -#include "lookup_table.h" -#include "xml.h" +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include "wimlib.h" +#include "wimlib/blob_table.h" +#include "wimlib/error.h" +#include "wimlib/inode.h" +#include "wimlib/metadata.h" +#include "wimlib/xml.h" -static int inode_allocate_needed_ltes(struct wim_inode *inode, - struct wim_lookup_table *src_lookup_table, - struct wim_lookup_table *dest_lookup_table, - struct list_head *lte_list_head) +static int +blob_set_not_exported(struct blob_descriptor *blob, void *_ignore) { - struct wim_lookup_table_entry *src_lte, *dest_lte; - unsigned i; + blob->out_refcnt = 0; + blob->was_exported = 0; + return 0; +} - inode_unresolve_ltes(inode); - for (i = 0; i <= inode->i_num_ads; i++) { - src_lte = inode_stream_lte_unresolved(inode, i, - src_lookup_table); - if (src_lte && src_lte->out_refcnt == 0) { - src_lte->out_refcnt = 1; - dest_lte = inode_stream_lte_unresolved(inode, i, - dest_lookup_table); - if (!dest_lte) { - dest_lte = clone_lookup_table_entry(src_lte); - if (!dest_lte) - return WIMLIB_ERR_NOMEM; - list_add_tail(&dest_lte->staging_list, lte_list_head); - } - } +static int +blob_rollback_export(struct blob_descriptor *blob, void *_blob_table) +{ + struct blob_table *blob_table = _blob_table; + + blob->refcnt -= blob->out_refcnt; + if (blob->was_exported) { + blob_table_unlink(blob_table, blob); + free_blob_descriptor(blob); } return 0; } -static void inode_move_ltes_to_table(struct wim_inode *inode, - struct wim_lookup_table *src_lookup_table, - struct wim_lookup_table *dest_lookup_table, - struct list_head *lte_list_head) +static int +inode_export_blobs(struct wim_inode *inode, struct blob_table *src_blob_table, + struct blob_table *dest_blob_table, bool gift) { - struct wim_lookup_table_entry *src_lte, *dest_lte; unsigned i; - struct wim_dentry *dentry; - - inode_for_each_dentry(dentry, inode) - dentry->refcnt++; - - for (i = 0; i <= inode->i_num_ads; i++) { - src_lte = inode_stream_lte_unresolved(inode, i, src_lookup_table); - if (src_lte) { - dest_lte = inode_stream_lte_unresolved(inode, i, - dest_lookup_table); - if (!dest_lte) { - struct list_head *next; - - wimlib_assert(!list_empty(lte_list_head)); - next = lte_list_head->next; - list_del(next); - dest_lte = container_of(next, - struct wim_lookup_table_entry, - staging_list); - dest_lte->part_number = 1; - dest_lte->refcnt = 0; - wimlib_assert(hashes_equal(dest_lte->hash, src_lte->hash)); - lookup_table_insert(dest_lookup_table, dest_lte); + const u8 *hash; + struct blob_descriptor *src_blob, *dest_blob; + + for (i = 0; i < inode->i_num_streams; i++) { + + /* Retrieve SHA-1 message digest of blob to export. */ + hash = stream_hash(&inode->i_streams[i]); + if (is_zero_hash(hash)) /* Empty stream? */ + continue; + + /* Search for the blob (via SHA-1 message digest) in the + * destination WIM. */ + dest_blob = lookup_blob(dest_blob_table, hash); + if (!dest_blob) { + /* Blob not yet present in destination WIM. Search for + * it in the source WIM, then export it into the + * destination WIM. */ + src_blob = stream_blob(&inode->i_streams[i], + src_blob_table); + if (!src_blob) + return blob_not_found_error(inode, hash); + + if (gift) { + dest_blob = src_blob; + blob_table_unlink(src_blob_table, src_blob); + } else { + dest_blob = clone_blob_descriptor(src_blob); + if (!dest_blob) + return WIMLIB_ERR_NOMEM; } - dest_lte->refcnt += inode->i_nlink; + dest_blob->refcnt = 0; + dest_blob->out_refcnt = 0; + dest_blob->was_exported = 1; + blob_table_insert(dest_blob_table, dest_blob); } + + /* Blob is present in destination WIM (either pre-existing, + * already exported, or just exported above). Increment its + * reference count appropriately. Note: we use 'refcnt' for + * the raw reference count, but 'out_refcnt' for references + * arising just from the export operation; this is used to roll + * back a failed export if needed. */ + dest_blob->refcnt += inode->i_nlink; + dest_blob->out_refcnt += inode->i_nlink; } + return 0; } -/* - * Copies an image, or all the images, from a WIM file, into another WIM file. - */ -WIMLIBAPI int wimlib_export_image(WIMStruct *src_wim, - int src_image, - WIMStruct *dest_wim, - const char *dest_name, - const char *dest_description, - int export_flags, - WIMStruct **additional_swms, - unsigned num_additional_swms, - wimlib_progress_func_t progress_func) +/* API function documented in wimlib.h */ +WIMLIBAPI int +wimlib_export_image(WIMStruct *src_wim, + int src_image, + WIMStruct *dest_wim, + const tchar *dest_name, + const tchar *dest_description, + int export_flags) { int ret; - struct wim_security_data *sd; - struct wim_lookup_table *joined_tab, *src_wim_tab_save; - struct wim_image_metadata *src_imd; - struct hlist_node *cur_node; - struct list_head lte_list_head; - struct wim_inode *inode; - - if (dest_wim->hdr.total_parts != 1) { - ERROR("Exporting an image to a split WIM is " - "unsupported"); - return WIMLIB_ERR_SPLIT_UNSUPPORTED; - } + int start_src_image; + int end_src_image; + int orig_dest_image_count; + int image; + bool all_images = (src_image == WIMLIB_ALL_IMAGES); - if (src_image == WIMLIB_ALL_IMAGES) { - if (src_wim->hdr.image_count > 1) { - - /* multi-image export. */ - - if ((export_flags & WIMLIB_EXPORT_FLAG_BOOT) && - (src_wim->hdr.boot_idx == 0)) - { - /* Specifying the boot flag on a multi-image - * source WIM makes the boot index default to - * the bootable image in the source WIM. It is - * an error if there is no such bootable image. - * */ - ERROR("Cannot specify `boot' flag when " - "exporting multiple images from a WIM " - "with no bootable images"); - return WIMLIB_ERR_INVALID_PARAM; - } - if (dest_name || dest_description) { - ERROR("Image name or image description was " - "specified, but we are exporting " - "multiple images"); - return WIMLIB_ERR_INVALID_PARAM; - } - for (int i = 1; i <= src_wim->hdr.image_count; i++) { - int new_flags = export_flags; - - if (i != src_wim->hdr.boot_idx) - new_flags &= ~WIMLIB_EXPORT_FLAG_BOOT; - - ret = wimlib_export_image(src_wim, i, dest_wim, - NULL, NULL, - new_flags, - additional_swms, - num_additional_swms, - progress_func); - if (ret != 0) - return ret; - } - return 0; - } else if (src_wim->hdr.image_count == 1) { - src_image = 1; - } else { - return 0; + /* Check for sane parameters. */ + if (export_flags & ~(WIMLIB_EXPORT_FLAG_BOOT | + WIMLIB_EXPORT_FLAG_NO_NAMES | + WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS | + WIMLIB_EXPORT_FLAG_GIFT | + WIMLIB_EXPORT_FLAG_WIMBOOT)) + return WIMLIB_ERR_INVALID_PARAM; + + if (!src_wim || !dest_wim) + return WIMLIB_ERR_INVALID_PARAM; + + if (!wim_has_metadata(src_wim) || !wim_has_metadata(dest_wim)) + return WIMLIB_ERR_METADATA_NOT_FOUND; + + if (all_images) { + /* Multi-image export. */ + if ((!(export_flags & WIMLIB_EXPORT_FLAG_NO_NAMES) && + dest_name) || + (!(export_flags & WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS) && + dest_description)) + { + ERROR("Image name and description must be " + "left NULL for multi-image export"); + return WIMLIB_ERR_INVALID_PARAM; } + start_src_image = 1; + end_src_image = src_wim->hdr.image_count; + } else { + start_src_image = src_image; + end_src_image = src_image; } + orig_dest_image_count = dest_wim->hdr.image_count; - if (!dest_name) { - dest_name = wimlib_get_image_name(src_wim, src_image); - DEBUG("Using name `%s' for source image %d", - dest_name, src_image); + /* We don't yet support having a single WIMStruct contain duplicate + * 'image_metadata' structures, so we must forbid this from happening. + * A duplication is possible if 'src_wim == dest_wim', if the same image + * is exported to the same destination WIMStruct multiple times, or if + * an image is exported in an A => B => A manner. */ + for (src_image = start_src_image; + src_image <= end_src_image; src_image++) + { + const struct wim_image_metadata *src_imd = + src_wim->image_metadata[src_image - 1]; + for (int i = 0; i < dest_wim->hdr.image_count; i++) + if (dest_wim->image_metadata[i] == src_imd) + return WIMLIB_ERR_DUPLICATE_EXPORTED_IMAGE; } - if (!dest_description) { - dest_description = wimlib_get_image_description(src_wim, - src_image); - DEBUG("Using description `%s' for source image %d", - dest_description, src_image); - } + /* Blob checksums must be known before proceeding. */ + ret = wim_checksum_unhashed_blobs(src_wim); + if (ret) + return ret; + ret = wim_checksum_unhashed_blobs(dest_wim); + if (ret) + return ret; - DEBUG("Exporting image %d from `%s'", src_image, src_wim->filename); + /* Enable rollbacks */ + for_blob_in_table(dest_wim->blob_table, blob_set_not_exported, NULL); - if (wimlib_image_name_in_use(dest_wim, dest_name)) { - ERROR("There is already an image named `%s' in the " - "destination WIM", dest_name); - return WIMLIB_ERR_IMAGE_NAME_COLLISION; - } + /* Export each requested image. */ + for (src_image = start_src_image; + src_image <= end_src_image; + src_image++) + { + const tchar *next_dest_name, *next_dest_description; + struct wim_image_metadata *src_imd; + struct wim_inode *inode; - ret = verify_swm_set(src_wim, additional_swms, num_additional_swms); - if (ret != 0) - return ret; + /* Determine destination image name and description. */ - if (num_additional_swms) { - ret = new_joined_lookup_table(src_wim, additional_swms, - num_additional_swms, - &joined_tab); - if (ret != 0) - return ret; - src_wim_tab_save = src_wim->lookup_table; - src_wim->lookup_table = joined_tab; - } + if (export_flags & WIMLIB_EXPORT_FLAG_NO_NAMES) + next_dest_name = NULL; + else if (dest_name) + next_dest_name = dest_name; + else + next_dest_name = wimlib_get_image_name(src_wim, src_image); - ret = select_wim_image(src_wim, src_image); - if (ret != 0) { - ERROR("Could not select image %d from the WIM `%s' " - "to export it", src_image, src_wim->filename); - goto out; - } + if (export_flags & WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS) + next_dest_description = NULL; + else if (dest_description) + next_dest_description = dest_description; + else + next_dest_description = wimlib_get_image_description(src_wim, src_image); - /* Pre-allocate the new lookup table entries that will be needed. This - * way, it's not possible to run out of memory part-way through - * modifying the lookup table of the destination WIM. */ - INIT_LIST_HEAD(<e_list_head); - for_lookup_table_entry(src_wim->lookup_table, lte_zero_out_refcnt, NULL); - src_imd = wim_get_current_image_metadata(src_wim); - - hlist_for_each_entry(inode, cur_node, &src_imd->inode_list, i_hlist) { - ret = inode_allocate_needed_ltes(inode, - src_wim->lookup_table, - dest_wim->lookup_table, - <e_list_head); - if (ret != 0) - goto out_free_ltes; - } + /* Check for name conflict. */ + if (wimlib_image_name_in_use(dest_wim, next_dest_name)) { + ERROR("There is already an image named \"%"TS"\" " + "in the destination WIM", next_dest_name); + ret = WIMLIB_ERR_IMAGE_NAME_COLLISION; + goto out_rollback; + } - ret = xml_export_image(src_wim->wim_info, src_image, - &dest_wim->wim_info, dest_name, - dest_description); - if (ret != 0) - goto out_free_ltes; - - sd = src_imd->security_data; - ret = add_new_dentry_tree(dest_wim, src_imd->root_dentry, sd); - if (ret != 0) - goto out_xml_delete_image; - - dest_wim->image_metadata[ - dest_wim->hdr.image_count - 1].inode_list = src_imd->inode_list; - if (src_imd->inode_list.first) - src_imd->inode_list.first->pprev = NULL; - - /* All memory allocations have been taken care of, so it's no longer - * possible for this function to fail. Go ahead and increment the - * reference counts of the dentry tree and security data, then update - * the lookup table of the destination WIM and the boot index, if - * needed. */ - sd->refcnt++; - hlist_for_each_entry(inode, cur_node, &src_imd->inode_list, i_hlist) { - inode_move_ltes_to_table(inode, - src_wim->lookup_table, - dest_wim->lookup_table, - <e_list_head); + /* Load metadata for source image into memory. */ + ret = select_wim_image(src_wim, src_image); + if (ret) + goto out_rollback; + + src_imd = wim_get_current_image_metadata(src_wim); + + /* Iterate through inodes in the source image and export their + * blobs into the destination WIM. */ + image_for_each_inode(inode, src_imd) { + ret = inode_export_blobs(inode, + src_wim->blob_table, + dest_wim->blob_table, + export_flags & WIMLIB_EXPORT_FLAG_GIFT); + if (ret) + goto out_rollback; + } + + /* Export XML information into the destination WIM. */ + ret = xml_export_image(src_wim->xml_info, src_image, + dest_wim->xml_info, next_dest_name, + next_dest_description, + export_flags & WIMLIB_EXPORT_FLAG_WIMBOOT); + if (ret) + goto out_rollback; + + /* Reference the source image metadata from the destination WIM. + */ + ret = append_image_metadata(dest_wim, src_imd); + if (ret) + goto out_rollback; + src_imd->refcnt++; } - if (export_flags & WIMLIB_EXPORT_FLAG_BOOT) - wimlib_set_boot_idx(dest_wim, dest_wim->hdr.image_count); - ret = 0; - goto out; + /* Image export complete. Finish by setting any needed special metadata + * on the destination WIM. */ + + if (src_wim->hdr.flags & WIM_HDR_FLAG_RP_FIX) + dest_wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX; -out_xml_delete_image: - xml_delete_image(&dest_wim->wim_info, dest_wim->hdr.image_count); -out_free_ltes: + for (src_image = start_src_image; + src_image <= end_src_image; + src_image++) { - struct wim_lookup_table_entry *lte, *tmp; - list_for_each_entry_safe(lte, tmp, <e_list_head, staging_list) - free_lookup_table_entry(lte); + int dst_image = orig_dest_image_count + 1 + + (src_image - start_src_image); + + if ((export_flags & WIMLIB_EXPORT_FLAG_BOOT) && + (!all_images || src_image == src_wim->hdr.boot_idx)) + dest_wim->hdr.boot_idx = dst_image; } -out: - if (num_additional_swms) { - free_lookup_table(src_wim->lookup_table); - src_wim->lookup_table = src_wim_tab_save; + return 0; + +out_rollback: + while ((image = xml_get_image_count(dest_wim->xml_info)) + > orig_dest_image_count) + { + xml_delete_image(dest_wim->xml_info, image); + } + while (dest_wim->hdr.image_count > orig_dest_image_count) + { + put_image_metadata(dest_wim->image_metadata[ + --dest_wim->hdr.image_count], NULL); } + for_blob_in_table(dest_wim->blob_table, blob_rollback_export, + dest_wim->blob_table); return ret; }