#include <ntfs-3g/security.h>
#endif
-/* Sets and creates the directory to which files are to be extracted when
- * extracting files from the WIM. */
-static int set_output_dir(WIMStruct *w, const char *dir)
+/* 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,
+ struct lookup_table_entry *lte)
{
- char *p;
- DEBUG("Setting output directory to `%s'", dir);
+ /* 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) */
- p = STRDUP(dir);
- if (!p) {
- ERROR("Out of memory");
- return WIMLIB_ERR_NOMEM;
- }
+ wimlib_assert(lte->file_on_disk);
- if (mkdir(dir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) != 0) {
- if (errno == EEXIST) {
- DEBUG("`%s' already exists", dir);
- goto done;
+
+ 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;
}
- ERROR_WITH_ERRNO("Cannot create directory `%s'", dir);
- FREE(p);
- return WIMLIB_ERR_MKDIR;
} else {
- DEBUG("Created directory `%s'", dir);
+ int num_path_components;
+ int num_output_dir_path_components;
+ size_t file_on_disk_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 =
+ 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);
+
+ 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;
+ }
+
}
-done:
- FREE(w->output_dir);
- w->output_dir = p;
return 0;
}
-/*
- * 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,
- int extract_flags)
+static int extract_regular_file_unlinked(WIMStruct *w,
+ struct dentry *dentry,
+ const char *output_path,
+ int extract_flags,
+ struct lookup_table_entry *lte)
{
- struct lookup_table_entry *lte;
- int ret;
+ /* 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;
-
- 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)
- {
- 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(w->output_dir);
-
- if (w->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_WITH_ERRNO("Failed to symlink `%s' to "
- "`%s'",
- buf, lte->file_on_disk);
- return WIMLIB_ERR_LINK;
+ int ret;
+ 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;
}
-
}
- 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;
+ }
+ }
- /* Otherwise, we must actually extract the file contents. */
+ /* 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) {
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,
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 = 0;
- else
- 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;
}
+/*
+ * Extracts a regular file from the WIM archive.
+ */
+static int extract_regular_file(WIMStruct *w,
+ struct dentry *dentry,
+ const char *output_dir,
+ const char *output_path,
+ int extract_flags)
+{
+ struct lookup_table_entry *lte;
+
+ 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;
+ }
+
+ 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.
*
* @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)
{
/* Compute the output path directory to the directory. */
if (mkdir(output_path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) != 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
- * 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_regular_file_or_directory(struct dentry *dentry, void *arg)
+static int extract_dentry(struct dentry *dentry, void *arg)
{
struct extract_args *args = arg;
WIMStruct *w = args->w;
int extract_flags = args->extract_flags;
- size_t len = strlen(w->output_dir);
+ size_t len = strlen(args->output_dir);
char output_path[len + dentry->full_path_utf8_len + 1];
- 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, 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, extract_flags);
- } else {
- if (dentry_is_root(dentry)) /* Root doesn't need to be extracted. */
- return 0;
- else
- return extract_directory(dentry, output_path);
- }
+ if (dentry_is_symlink(dentry))
+ return extract_symlink(dentry, output_path, w);
+ else if (dentry_is_directory(dentry))
+ return extract_directory(output_path);
+ else
+ return extract_regular_file(w, dentry, args->output_dir,
+ output_path, extract_flags);
}
-static int extract_single_image(WIMStruct *w, int image, int extract_flags)
+static int extract_single_image(WIMStruct *w, int image,
+ const char *output_dir, int extract_flags)
{
DEBUG("Extracting image %d", image);
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_regular_file_or_directory, &args);
+ 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, int extract_flags)
+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;
DEBUG("Attempting to extract all images from `%s'", w->filename);
- memcpy(buf, w->output_dir, output_path_len);
+ ret = extract_directory(output_dir);
+ 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++) {
/* Image name is empty. Use image number instead */
sprintf(buf + output_path_len + 1, "%d", image);
}
- ret = set_output_dir(w, buf);
- if (ret != 0)
- goto done;
- ret = extract_single_image(w, image, extract_flags);
+ ret = extract_single_image(w, image, buf, extract_flags);
if (ret != 0)
goto 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;
-
- ret = set_output_dir(w, output_dir);
- 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);
+ int 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);
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 "
return WIMLIB_ERR_UNSUPPORTED;
#endif
}
+
+ for_lookup_table_entry(w->lookup_table, zero_out_refcnts, NULL);
+
if (image == WIM_ALL_IMAGES) {
- w->is_multi_image_extraction = true;
- ret = extract_all_images(w, flags);
+ flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
+ return extract_all_images(w, output_dir, flags);
} else {
- w->is_multi_image_extraction = false;
- ret = extract_single_image(w, image, flags);
+ flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
+ return extract_single_image(w, image, output_dir, flags);
}
- return ret;
}
git://wimlib.net / wimlib / blobdiff