X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fextract.c;h=da637d2e55593345e06a1cc908d40511a9111b27;hp=4663df072569918cbb3b78189d487d8d4281bcd2;hb=150fd376ac944f0fdc22c0df7beaa8dbd076061c;hpb=ecdb6a689808479505db2761337493955269737b diff --git a/src/extract.c b/src/extract.c index 4663df07..da637d2e 100644 --- a/src/extract.c +++ b/src/extract.c @@ -24,57 +24,45 @@ * along with wimlib; if not, see http://www.gnu.org/licenses/. */ -#include "wimlib_internal.h" + +#include +#include +#include +#include +#include +#include +#include + +#include "config.h" #include "dentry.h" #include "lookup_table.h" +#include "timestamp.h" +#include "wimlib_internal.h" #include "xml.h" -#include -#include -#include -#include -#include -#include #ifdef WITH_NTFS_3G #include #include #endif + /* Internal */ #define WIMLIB_EXTRACT_FLAG_MULTI_IMAGE 0x80000000 -/* Sets and creates the directory to which files are to be extracted when - * extracting files from the WIM. */ -static int make_output_dir(const char *dir) -{ - char *p; - DEBUG("Setting output directory to `%s'", dir); - - if (mkdir(dir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) != 0) { - if (errno == EEXIST) { - DEBUG("`%s' already exists", dir); - return 0; - } - ERROR_WITH_ERRNO("Cannot create directory `%s'", dir); - return WIMLIB_ERR_MKDIR; - } else { - DEBUG("Created directory `%s'", dir); - } - return 0; -} - 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); + if (extract_flags & WIMLIB_EXTRACT_FLAG_HARDLINK) { if (link(lte->file_on_disk, output_path) != 0) { ERROR_WITH_ERRNO("Failed to hard link " @@ -90,6 +78,8 @@ static int extract_regular_file_linked(const struct dentry *dentry, 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 = @@ -127,15 +117,50 @@ static int extract_regular_file_linked(const struct dentry *dentry, } static int extract_regular_file_unlinked(WIMStruct *w, - const struct dentry *dentry, + struct dentry *dentry, const char *output_path, int extract_flags, struct lookup_table_entry *lte) { + /* Normal mode of extraction. Regular files and hard links are + * extracted in the way that they appear in the WIM. */ + int out_fd; const struct resource_entry *res_entry; int ret; - /* Otherwise, we must actually extract the file contents. */ + const struct list_head *head = &dentry->link_group_list; + + if (head->next != head) { + /* 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 + * already-extracted directory. Otherwise, extract the + * file, and set the dentry->extracted_file field so that other + * dentries in the hard link group can link to it. */ + struct dentry *other; + list_for_each_entry(other, head, link_group_list) { + if (other->extracted_file) { + DEBUG("Extracting hard link `%s' => `%s'", + output_path, other->extracted_file); + if (link(other->extracted_file, output_path) != 0) { + ERROR_WITH_ERRNO("Failed to hard link " + "`%s' to `%s'", + output_path, + other->extracted_file); + return WIMLIB_ERR_LINK; + } + return 0; + } + } + FREE(dentry->extracted_file); + dentry->extracted_file = STRDUP(output_path); + if (!dentry->extracted_file) { + ERROR("Failed to allocate memory for filename"); + return WIMLIB_ERR_NOMEM; + } + } + + /* Extract the contents of the file to @output_path. */ out_fd = open(output_path, O_WRONLY | O_CREAT | O_TRUNC, 0644); if (out_fd == -1) { @@ -144,13 +169,14 @@ static int extract_regular_file_unlinked(WIMStruct *w, return WIMLIB_ERR_OPEN; } - /* Extract empty file, with no lookup table entry... */ if (!lte) { + /* Empty file with no lookup table entry */ DEBUG("Empty file `%s'.", output_path); ret = 0; goto done; } + res_entry = <e->resource_entry; ret = extract_resource_to_fd(w, res_entry, out_fd, @@ -161,14 +187,20 @@ static int extract_regular_file_unlinked(WIMStruct *w, goto done; } - /* 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; + 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: - close(out_fd); + if (close(out_fd) != 0) { + ERROR_WITH_ERRNO("Failed to close file `%s'", output_path); + ret = WIMLIB_ERR_WRITE; + } return ret; } @@ -176,26 +208,28 @@ done: * Extracts a regular file from the WIM archive. */ static int extract_regular_file(WIMStruct *w, - const struct dentry *dentry, + 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)); + lte = dentry_first_lte(dentry, w->lookup_table); + + if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | + WIMLIB_EXTRACT_FLAG_HARDLINK)) && lte) { + if (lte->out_refcnt++ != 0) + return extract_regular_file_linked(dentry, output_dir, + output_path, + extract_flags, lte); + lte->file_on_disk = STRDUP(output_path); + if (!lte->file_on_disk) + return WIMLIB_ERR_NOMEM; + } - /* 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); + return extract_regular_file_unlinked(w, dentry, output_path, + extract_flags, lte); } @@ -225,22 +259,32 @@ 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(struct dentry *dentry, 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; } @@ -255,11 +299,8 @@ 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) { @@ -268,25 +309,48 @@ 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)) { - if (!dentry_is_root(dentry)) /* Root doesn't need to be extracted. */ - ret = extract_directory(dentry, 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; +} + +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; } @@ -309,7 +373,12 @@ 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); + } @@ -327,6 +396,10 @@ 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, true); + if (ret != 0) + return ret; + memcpy(buf, output_dir, output_path_len); buf[output_path_len] = '/'; for (image = 1; image <= w->hdr.image_count; image++) { @@ -338,9 +411,6 @@ static int extract_all_images(WIMStruct *w, const char *output_dir, /* Image name is empty. Use image number instead */ sprintf(buf + output_path_len + 1, "%d", image); } - ret = make_output_dir(buf); - if (ret != 0) - goto done; ret = extract_single_image(w, image, buf, extract_flags); if (ret != 0) goto done; @@ -355,52 +425,58 @@ 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; - if (image == WIM_ALL_IMAGES) + for_lookup_table_entry(w->lookup_table, zero_out_refcnts, NULL); + + if (image == WIM_ALL_IMAGES) { flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE; - else + return extract_all_images(w, output_dir, flags); + } else { flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE; - - ret = make_output_dir(output_dir); + return extract_single_image(w, image, output_dir, flags); + } + +} + +WIMLIBAPI int wimlib_apply_image_to_ntfs_volume(WIMStruct *w, int image, + const char *device, int flags) +{ +#ifdef WITH_NTFS_3G + int ret; + + if (!device) + return WIMLIB_ERR_INVALID_PARAM; + if (image == WIM_ALL_IMAGES) { + ERROR("Can only apply a single image when applying " + "directly to a NTFS volume"); + return WIMLIB_ERR_INVALID_PARAM; + } + if (flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) { + ERROR("Cannot specifcy symlink or hardlink flags when applying "); + ERROR("directly to a NTFS volume"); + return WIMLIB_ERR_INVALID_PARAM; + } + ret = wimlib_select_image(w, image); if (ret != 0) return ret; - 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; + if (getuid() != 0) { + ERROR("We are not root, but NTFS-3g requires root privileges to set arbitrary"); + ERROR("security data on the NTFS filesystem. Please run this program as root"); + ERROR("if you want to extract a WIM image while preserving NTFS-specific"); + ERROR("information."); + return WIMLIB_ERR_NOT_ROOT; + } +#else /* WITH_NTFS_3G */ + ERROR("wimlib was compiled without support for NTFS-3g, so"); + ERROR("we cannot apply a WIM image directly to a NTFS volume"); + return WIMLIB_ERR_UNSUPPORTED; +#endif /* !WITH_NTFS_3G */ }