X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fextract.c;h=70384329455a1cba7ef60570b0e7bce40e31dce9;hp=8873683f48302efbbeebb5bd7ef92ae0e4ae5595;hb=9c2a1f4f09bd6a532bba490764ae47f9c6acd1e2;hpb=6f77434ea6ff1407603410e28d1edb966c40e568 diff --git a/src/extract.c b/src/extract.c index 8873683f..70384329 100644 --- a/src/extract.c +++ b/src/extract.c @@ -35,108 +35,98 @@ #include #include - -/* - * Extracts a regular file from the WIM archive. - * - * @dentry: The directory entry for the file, which must be a - * regular file. - * @output_path: The path to which the file is to be extracted. - * @lookup_table: The lookup table for the WIM file. - * @wim_fp: The FILE* for the WIM, opened for reading. - * @wim_ctype: The type of compression used in the WIM. - * @link_type: One of WIM_LINK_TYPE_*; specifies what to do with - * files that are hard-linked inside the WIM. - * @is_multi_image_extraction: - * True if the image currently being extracted is just one - * image of a multi-image extraction. This is needed so - * that cross-image symbolic links can be created - * correctly. - */ -static int extract_regular_file(WIMStruct *w, - const struct dentry *dentry, - const char *output_path) +#ifdef WITH_NTFS_3G +#include +#include +#endif + +/* Internal */ +#define WIMLIB_EXTRACT_FLAG_MULTI_IMAGE 0x80000000 + +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 *lookup_table; - int link_type; - bool is_multi_image_extraction; - struct lookup_table_entry *lte; - int ret; - int out_fd; - const struct resource_entry *res_entry; - - lookup_table = w->lookup_table; - link_type = w->link_type; - is_multi_image_extraction = w->is_multi_image_extraction; - lte = lookup_resource(lookup_table, dentry->hash); + /* 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); + + if (extract_flags & WIMLIB_EXTRACT_FLAG_HARDLINK) { + if (link(lte->file_on_disk, output_path) != 0) { + ERROR_WITH_ERRNO("Failed to hard link " + "`%s' to `%s'", + output_path, lte->file_on_disk); + return WIMLIB_ERR_LINK; + } + } else { + int num_path_components; + int num_output_dir_path_components; + size_t file_on_disk_len; + char *p; + const char *p2; + size_t i; + + num_path_components = + get_num_path_components(dentry->full_path_utf8) - 1; + num_output_dir_path_components = + get_num_path_components(output_dir); + + if (extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE) { + num_path_components++; + num_output_dir_path_components--; + } + file_on_disk_len = strlen(lte->file_on_disk); - /* If we already extracted the same file or a hard link copy of it, we - * may be able to simply create a link. The exact action is specified - * by the current @link_type. */ - if (link_type != WIM_LINK_TYPE_NONE && lte && lte->out_refcnt != 0) { - wimlib_assert(lte->file_on_disk); - - if (link_type == WIM_LINK_TYPE_HARD) { - if (link(lte->file_on_disk, output_path) != 0) { - ERROR("Failed to hard link `%s' to `%s': %m\n", - output_path, lte->file_on_disk); - return WIMLIB_ERR_LINK; - } - } else { - int num_path_components; - int num_output_dir_path_components; - size_t file_on_disk_len; - char *p; - const char *p2; - size_t i; - - num_path_components = - get_num_path_components(dentry->full_path_utf8) - 1; - num_output_dir_path_components = - get_num_path_components(w->output_dir); - - if (is_multi_image_extraction) { - num_path_components++; - num_output_dir_path_components--; - } - file_on_disk_len = strlen(lte->file_on_disk); - - char buf[file_on_disk_len + 3 * num_path_components + 1]; - p = &buf[0]; - - for (i = 0; i < num_path_components; i++) { - *p++ = '.'; - *p++ = '.'; - *p++ = '/'; - } - p2 = lte->file_on_disk; - while (*p2 == '/') - p2++; - while (num_output_dir_path_components--) - p2 = path_next_part(p2, NULL); - strcpy(p, p2); - if (symlink(buf, output_path) != 0) { - ERROR("Failed to symlink `%s' to `%s': %m\n", - buf, lte->file_on_disk); - return WIMLIB_ERR_LINK; - } + char buf[file_on_disk_len + 3 * num_path_components + 1]; + p = &buf[0]; + for (i = 0; i < num_path_components; i++) { + *p++ = '.'; + *p++ = '.'; + *p++ = '/'; + } + p2 = lte->file_on_disk; + while (*p2 == '/') + p2++; + while (num_output_dir_path_components--) + p2 = path_next_part(p2, NULL); + strcpy(p, p2); + if (symlink(buf, output_path) != 0) { + ERROR_WITH_ERRNO("Failed to symlink `%s' to " + "`%s'", + buf, lte->file_on_disk); + return WIMLIB_ERR_LINK; } - return 0; - } + } + return 0; +} + +static int extract_regular_file_unlinked(WIMStruct *w, + const struct dentry *dentry, + const char *output_path, + int extract_flags, + struct lookup_table_entry *lte) +{ + int out_fd; + const struct resource_entry *res_entry; + int ret; /* Otherwise, we must actually extract the file contents. */ out_fd = open(output_path, O_WRONLY | O_CREAT | O_TRUNC, 0644); if (out_fd == -1) { - ERROR("Failed to open the file `%s' for writing: " - "%m\n", output_path); + ERROR_WITH_ERRNO("Failed to open the file `%s' for writing", + output_path); return WIMLIB_ERR_OPEN; } /* Extract empty file, with no lookup table entry... */ if (!lte) { - DEBUG("Empty file `%s'\n", output_path); + DEBUG("Empty file `%s'.", output_path); ret = 0; goto done; } @@ -147,7 +137,7 @@ static int extract_regular_file(WIMStruct *w, res_entry->original_size); if (ret != 0) { - ERROR("Failed to extract resource to `%s'!\n", output_path); + ERROR("Failed to extract resource to `%s'", output_path); goto done; } @@ -155,15 +145,59 @@ static int extract_regular_file(WIMStruct *w, lte->out_refcnt++; FREE(lte->file_on_disk); lte->file_on_disk = STRDUP(output_path); - if (lte->file_on_disk) - ret = 0; - else + if (!lte->file_on_disk) ret = WIMLIB_ERR_NOMEM; done: close(out_fd); return ret; } +/* + * Extracts a regular file from the WIM archive. + */ +static int extract_regular_file(WIMStruct *w, + const struct dentry *dentry, + const char *output_dir, + const char *output_path, + int extract_flags) +{ + struct lookup_table_entry *lte; + + lte = __lookup_resource(w->lookup_table, dentry_hash(dentry)); + + /* If we already extracted the same file or a hard link copy of it, we + * may be able to simply create a link. The exact action is specified + * by the current @link_type. */ + 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); + +} + +static int extract_symlink(const struct dentry *dentry, const char *output_path, + const WIMStruct *w) +{ + char target[4096]; + ssize_t ret = dentry_readlink(dentry, target, sizeof(target), w); + if (ret <= 0) { + ERROR("Could not read the symbolic link from dentry `%s'", + dentry->full_path_utf8); + return WIMLIB_ERR_INVALID_DENTRY; + } + ret = symlink(target, output_path); + if (ret != 0) { + ERROR_WITH_ERRNO("Failed to symlink `%s' to `%s'", + output_path, target); + return WIMLIB_ERR_LINK; + } + return 0; +} + /* * Extracts a directory from the WIM archive. * @@ -183,14 +217,22 @@ static int extract_directory(struct dentry *dentry, const char *output_path) itself. */ return 0; default: - ERROR("Cannot create directory `%s': %m\n", - output_path); + ERROR_WITH_ERRNO("Cannot create directory `%s'", + output_path); return WIMLIB_ERR_MKDIR; } } return 0; } +struct extract_args { + WIMStruct *w; + int extract_flags; + const char *output_dir; +#ifdef WITH_NTFS_3G + struct SECURITY_API *scapi; +#endif +}; /* * Extracts a file or directory from the WIM archive. For use in @@ -199,145 +241,138 @@ static int extract_directory(struct dentry *dentry, const char *output_path) * @dentry: The dentry to extract. * @arg: A pointer to the WIMStruct for the WIM file. */ -static int extract_regular_file_or_directory(struct dentry *dentry, void *arg) +static int extract_dentry(struct dentry *dentry, void *arg) { - WIMStruct *w = (WIMStruct*)arg; - size_t len = strlen(w->output_dir); + struct extract_args *args = arg; + WIMStruct *w = args->w; + 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; - if (w->verbose) + if (extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) puts(dentry->full_path_utf8); - memcpy(output_path, w->output_dir, len); + 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_regular_file(dentry)) { - return extract_regular_file(w, dentry, output_path); + if (dentry_is_symlink(dentry)) { + ret = extract_symlink(dentry, output_path, w); + } else if (dentry_is_directory(dentry)) { + ret = extract_directory(dentry, output_path); } else { - if (dentry_is_root(dentry)) /* Root doesn't need to be extracted. */ - return 0; - else - return extract_directory(dentry, output_path); + ret = extract_regular_file(w, dentry, args->output_dir, + output_path, extract_flags); } + return ret; } -static int extract_single_image(WIMStruct *w, int image) + +static int extract_single_image(WIMStruct *w, int image, + const char *output_dir, int extract_flags) { - DEBUG("Extracting image %d\n", image); + DEBUG("Extracting image %d", image); int ret; ret = wimlib_select_image(w, image); if (ret != 0) return ret; - return for_dentry_in_tree(wim_root_dentry(w), - extract_regular_file_or_directory, w); + struct extract_args args = { + .w = w, + .extract_flags = extract_flags, + .output_dir = output_dir, + #ifdef WITH_NTFS_3G + .scapi = NULL + #endif + }; + + return for_dentry_in_tree(wim_root_dentry(w), extract_dentry, &args); } -/* Extracts all images from the WIM to w->output_dir, with the images placed in +/* Extracts all images from the WIM to @output_dir, with the images placed in * subdirectories named by their image names. */ -static int extract_all_images(WIMStruct *w) +static int extract_all_images(WIMStruct *w, const char *output_dir, + int extract_flags) { size_t image_name_max_len = max(xml_get_max_image_name_len(w), 20); - size_t output_path_len = strlen(w->output_dir); + size_t output_path_len = strlen(output_dir); char buf[output_path_len + 1 + image_name_max_len + 1]; int ret; int image; const char *image_name; - DEBUG("Attempting to extract all images from `%s'\n", w->filename); + DEBUG("Attempting to extract all images from `%s'", w->filename); - memcpy(buf, w->output_dir, output_path_len); + memcpy(buf, output_dir, output_path_len); buf[output_path_len] = '/'; for (image = 1; image <= w->hdr.image_count; image++) { - buf[output_path_len + 1] = '\0'; image_name = wimlib_get_image_name(w, image); if (*image_name) { - strncat(buf + output_path_len + 1, image_name, - image_name_max_len); + strcpy(buf + output_path_len + 1, image_name); } else { /* Image name is empty. Use image number instead */ sprintf(buf + output_path_len + 1, "%d", image); } - ret = wimlib_set_output_dir(w, buf); - if (ret != 0) - goto done; - ret = extract_single_image(w, image); + ret = extract_single_image(w, image, buf, extract_flags); if (ret != 0) goto done; } - ret = 0; done: + /* Restore original output directory */ buf[output_path_len + 1] = '\0'; - wimlib_set_output_dir(w, buf); - return ret; + return 0; } /* Extracts a single image or all images from a WIM file. */ -WIMLIBAPI int wimlib_extract_image(WIMStruct *w, int image) -{ - if (!w->output_dir) { - ERROR("No output directory selected.\n"); - return WIMLIB_ERR_NOTDIR; - } - if (image == WIM_ALL_IMAGES) { - w->is_multi_image_extraction = true; - return extract_all_images(w); - } else { - w->is_multi_image_extraction = false; - return extract_single_image(w, image); - } - -} - -/* Set the output directory for WIM extraction. The directory is created using - * mkdir(). Fails if directory cannot be created or already exists. */ -WIMLIBAPI int wimlib_set_output_dir(WIMStruct *w, const char *dir) +WIMLIBAPI int wimlib_extract_image(WIMStruct *w, int image, + const char *output_dir, int flags) { - char *p; - DEBUG("Setting output directory to `%s'\n", dir); - - if (!dir) { - ERROR("Must specify a directory!\n"); + 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; - } - p = STRDUP(dir); - if (!p) { - ERROR("Out of memory!\n"); - return WIMLIB_ERR_NOMEM; - } - if (mkdir(dir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) != 0) { - if (errno == EEXIST) { - DEBUG("`%s' already exists\n", dir); - goto done; + if (image == WIM_ALL_IMAGES) + flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE; + else + flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE; + + 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; } - ERROR("Cannot create directory `%s': %m\n", dir); - FREE(p); - return WIMLIB_ERR_MKDIR; - } else { - DEBUG("Created directory `%s'\n", dir); + 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 } -done: - FREE(w->output_dir); - w->output_dir = p; - return 0; -} + 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; -WIMLIBAPI int wimlib_set_link_type(WIMStruct *w, int link_type) -{ - switch (link_type) { - case WIM_LINK_TYPE_NONE: - case WIM_LINK_TYPE_HARD: - case WIM_LINK_TYPE_SYMBOLIC: - w->link_type = link_type; - return 0; - default: - return WIMLIB_ERR_INVALID_PARAM; - } } -