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https://github.com/sheumann/hush.git
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120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include "unarchive.h"
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void data_extract_all(archive_handle_t *archive_handle)
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{
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file_header_t *file_header = archive_handle->file_header;
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int dst_fd;
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int res;
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if (archive_handle->flags & ARCHIVE_CREATE_LEADING_DIRS) {
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char *name = xstrdup(file_header->name);
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bb_make_directory(dirname(name), -1, FILEUTILS_RECUR);
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free(name);
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}
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/* Check if the file already exists */
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if (archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
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/* Remove the existing entry if it exists */
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if (((file_header->mode & S_IFMT) != S_IFDIR)
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&& (unlink(file_header->name) == -1)
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&& (errno != ENOENT)
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) {
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bb_perror_msg_and_die("cannot remove old file");
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}
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}
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else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
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/* Remove the existing entry if its older than the extracted entry */
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struct stat statbuf;
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if (lstat(file_header->name, &statbuf) == -1) {
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if (errno != ENOENT) {
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bb_perror_msg_and_die("cannot stat old file");
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}
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}
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else if (statbuf.st_mtime <= file_header->mtime) {
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if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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bb_error_msg("%s not created: newer or "
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"same age file exists", file_header->name);
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}
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data_skip(archive_handle);
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return;
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}
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else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
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bb_perror_msg_and_die("cannot remove old file %s",
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file_header->name);
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}
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}
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/* Handle hard links separately
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* We identified hard links as regular files of size 0 with a symlink */
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if (S_ISREG(file_header->mode) && (file_header->link_name)
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&& (file_header->size == 0)
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) {
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/* hard link */
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res = link(file_header->link_name, file_header->name);
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if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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bb_perror_msg("cannot create hard link");
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}
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} else {
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/* Create the filesystem entry */
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switch (file_header->mode & S_IFMT) {
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case S_IFREG: {
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/* Regular file */
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dst_fd = xopen3(file_header->name, O_WRONLY | O_CREAT | O_EXCL,
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file_header->mode);
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bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
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close(dst_fd);
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break;
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}
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case S_IFDIR:
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res = mkdir(file_header->name, file_header->mode);
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if ((errno != EISDIR) && (res == -1)
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&& !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
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) {
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bb_perror_msg("extract_archive: %s", file_header->name);
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}
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break;
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case S_IFLNK:
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/* Symlink */
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res = symlink(file_header->link_name, file_header->name);
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if ((res == -1)
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&& !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
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) {
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bb_perror_msg("cannot create symlink "
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"from %s to '%s'",
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file_header->name,
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file_header->link_name);
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}
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break;
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case S_IFSOCK:
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case S_IFBLK:
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case S_IFCHR:
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case S_IFIFO:
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res = mknod(file_header->name, file_header->mode, file_header->device);
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if ((res == -1)
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&& !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
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) {
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bb_perror_msg("cannot create node %s", file_header->name);
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}
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break;
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default:
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bb_error_msg_and_die("unrecognized file type");
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}
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}
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if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
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lchown(file_header->name, file_header->uid, file_header->gid);
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}
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if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
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struct utimbuf t;
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t.actime = t.modtime = file_header->mtime;
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utime(file_header->name, &t);
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}
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}
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