X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fextract.c;h=b1b740f06a4f368bd40064ad3edc814fa0de3cd8;hp=0cb06b87edb11d802845d254fda12c083be75515;hb=60b8f54df8fed44136bdc8ec615ee62703d87b69;hpb=b3f993d2ece8fda5c989dc8c0311732fb20e3233 diff --git a/src/extract.c b/src/extract.c index 0cb06b87..b1b740f0 100644 --- a/src/extract.c +++ b/src/extract.c @@ -2,6 +2,11 @@ * extract.c * * Support for extracting WIM files. + * + * This code does NOT contain any filesystem-specific features. In particular, + * security information (i.e. file permissions) and alternate data streams are + * ignored, except possibly to read an alternate data stream that contains + * symbolic link data. */ /* @@ -11,34 +16,34 @@ * This file is part of wimlib, a library for working with WIM files. * * wimlib 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 2.1 of the License, or (at your option) + * 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 Lesser General Public License for more + * A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * - * You should have received a copy of the GNU Lesser General Public License + * You should have received a copy of the GNU General Public License * 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" -#include -#include -#include + #include -#include #include +#include +#include +#include +#include +#include -#ifdef WITH_NTFS_3G -#include -#include -#endif +#include "config.h" +#include "dentry.h" +#include "lookup_table.h" +#include "timestamp.h" +#include "wimlib_internal.h" +#include "xml.h" /* Internal */ #define WIMLIB_EXTRACT_FLAG_MULTI_IMAGE 0x80000000 @@ -47,30 +52,31 @@ static int extract_regular_file_linked(const struct dentry *dentry, const char *output_dir, const char *output_path, int extract_flags, - const struct lookup_table_entry *lte) + struct lookup_table_entry *lte) { /* This mode overrides the normal hard-link extraction and * instead either symlinks or hardlinks *all* identical files in * the WIM, even if they are in a different image (in the case * of a multi-image extraction) */ - - wimlib_assert(lte->file_on_disk); + wimlib_assert(lte->extracted_file); if (extract_flags & WIMLIB_EXTRACT_FLAG_HARDLINK) { - if (link(lte->file_on_disk, output_path) != 0) { + if (link(lte->extracted_file, output_path) != 0) { ERROR_WITH_ERRNO("Failed to hard link " "`%s' to `%s'", - output_path, lte->file_on_disk); + output_path, lte->extracted_file); return WIMLIB_ERR_LINK; } } else { int num_path_components; int num_output_dir_path_components; - size_t file_on_disk_len; + size_t extracted_file_len; char *p; const char *p2; size_t i; + wimlib_assert(extract_flags & WIMLIB_EXTRACT_FLAG_SYMLINK); + num_path_components = get_num_path_components(dentry->full_path_utf8) - 1; num_output_dir_path_components = @@ -80,9 +86,9 @@ static int extract_regular_file_linked(const struct dentry *dentry, num_path_components++; num_output_dir_path_components--; } - file_on_disk_len = strlen(lte->file_on_disk); + extracted_file_len = strlen(lte->extracted_file); - char buf[file_on_disk_len + 3 * num_path_components + 1]; + char buf[extracted_file_len + 3 * num_path_components + 1]; p = &buf[0]; for (i = 0; i < num_path_components; i++) { @@ -90,7 +96,7 @@ static int extract_regular_file_linked(const struct dentry *dentry, *p++ = '.'; *p++ = '/'; } - p2 = lte->file_on_disk; + p2 = lte->extracted_file; while (*p2 == '/') p2++; while (num_output_dir_path_components--) @@ -99,7 +105,7 @@ static int extract_regular_file_linked(const struct dentry *dentry, if (symlink(buf, output_path) != 0) { ERROR_WITH_ERRNO("Failed to symlink `%s' to " "`%s'", - buf, lte->file_on_disk); + buf, lte->extracted_file); return WIMLIB_ERR_LINK; } @@ -117,11 +123,12 @@ static int extract_regular_file_unlinked(WIMStruct *w, * extracted in the way that they appear in the WIM. */ int out_fd; - const struct resource_entry *res_entry; int ret; const struct list_head *head = &dentry->link_group_list; - if (head->next != head) { + if (head->next != head && + !(extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE)) + { /* This dentry is one of a hard link set of at least 2 dentries. * If one of the other dentries has already been extracted, make * a hard link to the file corresponding to this @@ -167,26 +174,12 @@ static int extract_regular_file_unlinked(WIMStruct *w, goto done; } - - res_entry = <e->resource_entry; - - ret = extract_resource_to_fd(w, res_entry, out_fd, - res_entry->original_size); - + ret = extract_full_wim_resource_to_fd(lte, out_fd); if (ret != 0) { ERROR("Failed to extract resource to `%s'", output_path); goto done; } - if (extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE) { - /* Mark the lookup table entry to indicate this file has been - * extracted. */ - lte->out_refcnt++; - FREE(lte->file_on_disk); - lte->file_on_disk = STRDUP(output_path); - if (!lte->file_on_disk) - ret = WIMLIB_ERR_NOMEM; - } done: if (close(out_fd) != 0) { ERROR_WITH_ERRNO("Failed to close file `%s'", output_path); @@ -206,16 +199,21 @@ static int extract_regular_file(WIMStruct *w, { struct lookup_table_entry *lte; - lte = __lookup_resource(w->lookup_table, dentry_hash(dentry)); + lte = dentry_unnamed_lte(dentry, w->lookup_table); - if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) && - lte && lte->out_refcnt != 0) - return extract_regular_file_linked(dentry, output_dir, - output_path, extract_flags, - lte); - else - return extract_regular_file_unlinked(w, dentry, output_path, - extract_flags, lte); + if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | + WIMLIB_EXTRACT_FLAG_HARDLINK)) && lte) { + if (++lte->out_refcnt != 1) + return extract_regular_file_linked(dentry, output_dir, + output_path, + extract_flags, lte); + lte->extracted_file = STRDUP(output_path); + if (!lte->extracted_file) + return WIMLIB_ERR_NOMEM; + } + + return extract_regular_file_unlinked(w, dentry, output_path, + extract_flags, lte); } @@ -245,22 +243,32 @@ static int extract_symlink(const struct dentry *dentry, const char *output_path, * @output_path: The path to which the directory is to be extracted to. * @return: True on success, false on failure. */ -static int extract_directory(const char *output_path) +static int extract_directory(const char *output_path, bool is_root) { - /* Compute the output path directory to the directory. */ - if (mkdir(output_path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) != 0) - { - switch (errno) { - case EEXIST: /* Already existing directory is OK */ - case EACCES: /* We may have permissions to extract files inside - the directory, but not for the directory - itself. */ + int ret; + struct stat stbuf; + ret = stat(output_path, &stbuf); + if (ret == 0) { + if (S_ISDIR(stbuf.st_mode)) { + if (!is_root) + WARNING("`%s' already exists", output_path); return 0; - default: - ERROR_WITH_ERRNO("Cannot create directory `%s'", - output_path); + } else { + ERROR("`%s' is not a directory", output_path); return WIMLIB_ERR_MKDIR; } + } else { + if (errno != ENOENT) { + ERROR_WITH_ERRNO("Failed to stat `%s'", output_path); + return WIMLIB_ERR_STAT; + } + } + /* Compute the output path directory to the directory. */ + if (mkdir(output_path, S_IRWXU | S_IRGRP | S_IXGRP | + S_IROTH | S_IXOTH) != 0) { + ERROR_WITH_ERRNO("Cannot create directory `%s'", + output_path); + return WIMLIB_ERR_MKDIR; } return 0; } @@ -275,11 +283,8 @@ struct extract_args { }; /* - * Extracts a file or directory from the WIM archive. For use in - * for_dentry_in_tree(). - * - * @dentry: The dentry to extract. - * @arg: A pointer to the WIMStruct for the WIM file. + * Extracts a file, directory, or symbolic link from the WIM archive. For use + * in for_dentry_in_tree(). */ static int extract_dentry(struct dentry *dentry, void *arg) { @@ -288,24 +293,49 @@ static int extract_dentry(struct dentry *dentry, void *arg) int extract_flags = args->extract_flags; size_t len = strlen(args->output_dir); char output_path[len + dentry->full_path_utf8_len + 1]; - int ret = 0; + int ret; - if (extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) + if (extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) { + wimlib_assert(dentry->full_path_utf8); puts(dentry->full_path_utf8); + } memcpy(output_path, args->output_dir, len); memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len); output_path[len + dentry->full_path_utf8_len] = '\0'; - if (dentry_is_symlink(dentry)) { + if (dentry_is_symlink(dentry)) ret = extract_symlink(dentry, output_path, w); - } else if (dentry_is_directory(dentry)) { - ret = extract_directory(output_path); - } else { + else if (dentry_is_directory(dentry)) + ret = extract_directory(output_path, dentry_is_root(dentry)); + else ret = extract_regular_file(w, dentry, args->output_dir, - output_path, extract_flags); + output_path, extract_flags); + if (ret != 0) + return ret; + + return 0; +} + +/* Apply timestamp to extracted file */ +static int apply_dentry_timestamps(struct dentry *dentry, void *arg) +{ + struct extract_args *args = arg; + size_t len = strlen(args->output_dir); + char output_path[len + dentry->full_path_utf8_len + 1]; + + memcpy(output_path, args->output_dir, len); + memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len); + output_path[len + dentry->full_path_utf8_len] = '\0'; + + struct timeval tv[2]; + wim_timestamp_to_timeval(dentry->last_access_time, &tv[0]); + wim_timestamp_to_timeval(dentry->last_write_time, &tv[1]); + if (lutimes(output_path, tv) != 0) { + WARNING("Failed to set timestamp on file `%s': %s", + output_path, strerror(errno)); } - return ret; + return 0; } @@ -328,7 +358,12 @@ static int extract_single_image(WIMStruct *w, int image, #endif }; - return for_dentry_in_tree(wim_root_dentry(w), extract_dentry, &args); + ret = for_dentry_in_tree(wim_root_dentry(w), extract_dentry, &args); + if (ret != 0) + return ret; + return for_dentry_in_tree_depth(wim_root_dentry(w), + apply_dentry_timestamps, &args); + } @@ -346,7 +381,7 @@ static int extract_all_images(WIMStruct *w, const char *output_dir, DEBUG("Attempting to extract all images from `%s'", w->filename); - ret = extract_directory(output_dir); + ret = extract_directory(output_dir, true); if (ret != 0) return ret; @@ -375,50 +410,21 @@ done: WIMLIBAPI int wimlib_extract_image(WIMStruct *w, int image, const char *output_dir, int flags) { - int ret; if (!output_dir) return WIMLIB_ERR_INVALID_PARAM; + if ((flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) == (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) return WIMLIB_ERR_INVALID_PARAM; + for_lookup_table_entry(w->lookup_table, zero_out_refcnts, NULL); + if (image == WIM_ALL_IMAGES) { flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE; - for_lookup_table_entry(w->lookup_table, zero_out_refcnts, NULL); + return extract_all_images(w, output_dir, flags); } else { flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE; + return extract_single_image(w, image, output_dir, flags); } - - if ((flags & WIMLIB_EXTRACT_FLAG_NTFS)) { - #ifdef WITH_NTFS_3G - unsigned long mnt_flags; - ret = ntfs_check_if_mounted(output_dir, &mnt_flags); - if (ret != 0) { - ERROR_WITH_ERRNO("NTFS-3g: Cannot determine if `%s' " - "is mounted", output_dir); - return WIMLIB_ERR_NTFS_3G; - } - if (!(mnt_flags & NTFS_MF_MOUNTED)) { - ERROR("NTFS-3g: Filesystem on `%s' is not mounted ", - output_dir); - return WIMLIB_ERR_NTFS_3G; - } - if (mnt_flags & NTFS_MF_READONLY) { - ERROR("NTFS-3g: Filesystem on `%s' is mounted " - "read-only", output_dir); - return WIMLIB_ERR_NTFS_3G; - } - #else - ERROR("wimlib was compiled without support for NTFS-3g, so"); - ERROR("we cannot extract a WIM image while preserving NTFS-"); - ERROR("specific information"); - return WIMLIB_ERR_UNSUPPORTED; - #endif - } - if (image == WIM_ALL_IMAGES) - ret = extract_all_images(w, output_dir, flags); - else - ret = extract_single_image(w, image, output_dir, flags); - return ret; }