X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fexport_image.c;h=bfeef97ad6b41afc83970afd6315f072e991c4d3;hp=dfd9f058ffdd344a39022e0e44c4b8a5f20f982d;hb=cd433ce49f582175063141cc3673840bf321c453;hpb=276f9f9f9658f4a8bafd6216db46760abe8c848d diff --git a/src/export_image.c b/src/export_image.c index dfd9f058..bfeef97a 100644 --- a/src/export_image.c +++ b/src/export_image.c @@ -21,253 +21,259 @@ * along with wimlib; if not, see http://www.gnu.org/licenses/. */ -#include "wimlib_internal.h" -#include "dentry.h" -#include "lookup_table.h" -#include "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) +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include "wimlib.h" +#include "wimlib/dentry.h" +#include "wimlib/error.h" +#include "wimlib/inode.h" +#include "wimlib/lookup_table.h" +#include "wimlib/metadata.h" +#include "wimlib/xml.h" +#include + +static int +inode_export_streams(struct wim_inode *inode, + const struct wim_lookup_table *src_lookup_table, + struct wim_lookup_table *dest_lookup_table) { - struct wim_lookup_table_entry *src_lte, *dest_lte; unsigned i; + const u8 *hash; + struct wim_lookup_table_entry *src_lte, *dest_lte; - inode_unresolve_ltes(inode); + inode_unresolve_streams(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); - } + + /* Retrieve SHA1 message digest of stream to export. */ + hash = inode_stream_hash(inode, i); + if (is_zero_hash(hash)) /* Empty stream? */ + continue; + + /* Search for the stream (via SHA1 message digest) in the + * destination WIM. */ + dest_lte = lookup_stream(dest_lookup_table, hash); + if (!dest_lte) { + /* Stream not yet present in destination WIM. Search + * for it in the source WIM, then export it into the + * destination WIM. */ + src_lte = lookup_stream(src_lookup_table, hash); + if (!src_lte) + return stream_not_found_error(inode, hash); + + dest_lte = clone_lookup_table_entry(src_lte); + if (!dest_lte) + return WIMLIB_ERR_NOMEM; + dest_lte->refcnt = 0; + dest_lte->out_refcnt = 0; + lookup_table_insert(dest_lookup_table, dest_lte); } + + /* Stream 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_lte->refcnt += inode->i_nlink; + dest_lte->out_refcnt += inode->i_nlink; } 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 +lte_unexport(struct wim_lookup_table_entry *lte, void *_lookup_table) { - struct wim_lookup_table_entry *src_lte, *dest_lte; - unsigned i; - struct wim_dentry *dentry; - - inode_for_each_dentry(dentry, inode) - dentry->refcnt++; + struct wim_lookup_table *lookup_table = _lookup_table; - 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); - } - dest_lte->refcnt += inode->i_nlink; - } + lte->refcnt -= lte->out_refcnt; + if (lte->refcnt == 0) { + lookup_table_unlink(lookup_table, lte); + free_lookup_table_entry(lte); } + 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 tchar *dest_name, - const tchar *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, + wimlib_progress_func_t progress_func) { 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_image; + int end_image; + int image; + u32 orig_dest_boot_idx; + u32 orig_dest_image_count; + + /* Check for sane parameters. */ + if (export_flags & ~(WIMLIB_EXPORT_FLAG_BOOT | + WIMLIB_EXPORT_FLAG_NO_NAMES | + WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS)) + return WIMLIB_ERR_INVALID_PARAM; + + if (src_wim == NULL || dest_wim == NULL) + return WIMLIB_ERR_INVALID_PARAM; + + if (!wim_has_metadata(dest_wim)) + return WIMLIB_ERR_METADATA_NOT_FOUND; + + /* Destination WIM must be writable. */ + ret = can_modify_wim(dest_wim); + if (ret) + return ret; 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; + /* 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 or image description was " + "specified, but we are exporting " + "multiple images"); + return WIMLIB_ERR_INVALID_PARAM; } + start_image = 1; + end_image = src_wim->hdr.image_count; + } else { + start_image = src_image; + end_image = src_image; } - if (!dest_name) { - dest_name = wimlib_get_image_name(src_wim, src_image); - DEBUG("Using name `%"TS"' for source image %d", - dest_name, src_image); - } + /* Stream checksums must be known before proceeding. */ + ret = wim_checksum_unhashed_streams(src_wim); + if (ret) + return ret; + ret = wim_checksum_unhashed_streams(dest_wim); + if (ret) + return ret; - if (!dest_description) { - dest_description = wimlib_get_image_description(src_wim, - src_image); - DEBUG("Using description `%"TS"' for source image %d", - dest_description, src_image); - } + /* Zero 'out_refcnt' in all lookup table entries in the destination WIM; + * this tracks the number of references found from the source WIM + * image(s). */ + for_lookup_table_entry(dest_wim->lookup_table, lte_zero_out_refcnt, + NULL); - DEBUG("Exporting image %d from `%"TS"'", src_image, src_wim->filename); + /* Save the original count of images in the destination WIM and the boot + * index (used if rollback necessary). */ + orig_dest_image_count = dest_wim->hdr.image_count; + orig_dest_boot_idx = dest_wim->hdr.boot_idx; - if (wimlib_image_name_in_use(dest_wim, dest_name)) { - ERROR("There is already an image named `%"TS"' in the " - "destination WIM", dest_name); - return WIMLIB_ERR_IMAGE_NAME_COLLISION; - } + /* Export each requested image. */ + for (image = start_image; image <= end_image; 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; + DEBUG("Exporting image %d from \"%"TS"\"", + image, src_wim->filename); - 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; - } + /* Determine destination image name and description. */ - ret = select_wim_image(src_wim, src_image); - if (ret != 0) { - ERROR("Could not select image %d from the WIM `%"TS"' " - "to export it", src_image, src_wim->filename); - goto out; - } + if (export_flags & WIMLIB_EXPORT_FLAG_NO_NAMES) { + next_dest_name = T(""); + } else if (dest_name) { + next_dest_name = dest_name; + } else { + next_dest_name = wimlib_get_image_name(src_wim, + 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; - } + DEBUG("Using name \"%"TS"\"", next_dest_name); - 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); - } + if (export_flags & WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS) { + next_dest_description = T(""); + } else if (dest_description) { + next_dest_description = dest_description; + } else { + next_dest_description = wimlib_get_image_description( + src_wim, image); + } - if (export_flags & WIMLIB_EXPORT_FLAG_BOOT) - wimlib_set_boot_idx(dest_wim, dest_wim->hdr.image_count); - ret = 0; - goto out; + DEBUG("Using description \"%"TS"\"", next_dest_description); + + /* 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; + } + + /* Load metadata for source image into memory. */ + ret = select_wim_image(src_wim, 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 + * streams into the destination WIM. */ + image_for_each_inode(inode, src_imd) { + ret = inode_export_streams(inode, + src_wim->lookup_table, + dest_wim->lookup_table); + if (ret) + goto out_rollback; + } + + /* Export XML information into the destination WIM. */ + ret = xml_export_image(src_wim->wim_info, image, + &dest_wim->wim_info, next_dest_name, + next_dest_description); + 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++; + + /* Lock the metadata into memory. XXX: need better solution for + * this. */ + src_imd->modified = 1; + + /* Set boot index in destination WIM. */ + if ((export_flags & WIMLIB_EXPORT_FLAG_BOOT) && + (src_image != WIMLIB_ALL_IMAGES || + image == src_wim->hdr.boot_idx)) + { + DEBUG("Marking destination image %u as bootable.", + dest_wim->hdr.image_count); + dest_wim->hdr.boot_idx = dest_wim->hdr.image_count; + } -out_xml_delete_image: - xml_delete_image(&dest_wim->wim_info, dest_wim->hdr.image_count); -out_free_ltes: - { - struct wim_lookup_table_entry *lte, *tmp; - list_for_each_entry_safe(lte, tmp, <e_list_head, staging_list) - free_lookup_table_entry(lte); } + /* Set the reparse point fixup flag on the destination WIM if the flag + * is set on the source WIM. */ + if (src_wim->hdr.flags & WIM_HDR_FLAG_RP_FIX) + dest_wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX; + DEBUG("Export operation successful."); + return 0; -out: - if (num_additional_swms) { - free_lookup_table(src_wim->lookup_table); - src_wim->lookup_table = src_wim_tab_save; +out_rollback: + while ((image = wim_info_get_num_images(dest_wim->wim_info)) + > orig_dest_image_count) + { + xml_delete_image(&dest_wim->wim_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_lookup_table_entry(dest_wim->lookup_table, lte_unexport, + dest_wim->lookup_table); + dest_wim->hdr.boot_idx = orig_dest_boot_idx; return ret; }