1 /* vi: set sw=4 ts=4: */
3 * Mini cpio implementation for busybox
5 * Copyright (C) 2001 by Glenn McGrath
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Only supports new ASCII and CRC formats
31 #include "unarchive.h"
34 typedef struct hardlinks_s {
37 struct hardlinks_s *next;
40 extern int cpio_main(int argc, char **argv)
42 archive_handle_t *archive_handle;
46 archive_handle = init_handle();
47 archive_handle->src_fd = fileno(stdin);
48 archive_handle->seek = seek_by_char;
49 archive_handle->action_header = header_list;
51 while ((opt = getopt(argc, argv, "idmuvtF:")) != -1) {
53 case 'i': /* extract */
54 archive_handle->action_data = data_extract_all;
56 case 'd': /* create _leading_ directories */
57 archive_handle->flags |= ARCHIVE_CREATE_LEADING_DIRS;
59 case 'm': /* preserve modification time */
60 archive_handle->flags |= ARCHIVE_PRESERVE_DATE;
62 case 'v': /* verbosly list files */
63 archive_handle->action_header = header_verbose_list;
65 case 'u': /* unconditional */
66 archive_handle->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
68 case 't': /* list files */
69 archive_handle->action_header = header_list;
72 archive_handle->src_fd = xopen(optarg, O_RDONLY);
73 archive_handle->seek = seek_by_jump;
80 while (optind < argc) {
81 archive_handle->filter = filter_accept_list;
82 archive_handle->accept = llist_add_to(archive_handle->accept, argv[optind]);
87 static hardlinks_t *saved_hardlinks = NULL;
88 static unsigned short pending_hardlinks = 0;
89 file_header_t *file_header = archive_handle->file_header;
90 char cpio_header[110];
93 int major, minor, nlink, inode;
96 if (pending_hardlinks) { /* Deal with any pending hardlinks */
100 tmp = saved_hardlinks;
104 error_msg_and_die("need to fix this\n");
105 if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
106 file_header = tmp->entry;
108 oldtmp->next = tmp->next; /* Remove item from linked list */
110 saved_hardlinks = tmp->next;
118 pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
121 /* There can be padding before archive header */
122 data_align(archive_handle, 4);
124 if (archive_xread_all_eof(archive_handle, cpio_header, 110) == 0) {
125 return(EXIT_FAILURE);
127 archive_handle->offset += 110;
129 if (strncmp(&cpio_header[0], "07070", 5) != 0) {
130 printf("cpio header is %x-%x-%x-%x-%x\n",
136 error_msg_and_die("Unsupported cpio format");
139 if ((cpio_header[5] != '1') && (cpio_header[5] != '2')) {
140 error_msg_and_die("Unsupported cpio format, use newc or crc");
143 sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
144 dummy, &inode, (unsigned int*)&file_header->mode,
145 (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
146 &nlink, &file_header->mtime, &file_header->size,
147 dummy, &major, &minor, &namesize, dummy);
149 file_header->name = (char *) xmalloc(namesize + 1);
150 archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */
151 file_header->name[namesize] = '\0';
152 archive_handle->offset += namesize;
154 /* Update offset amount and skip padding before file contents */
155 data_align(archive_handle, 4);
157 if (strcmp(file_header->name, "TRAILER!!!") == 0) {
158 printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
159 if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
160 hardlinks_t *tmp = saved_hardlinks;
161 hardlinks_t *oldtmp = NULL;
163 error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
166 free (oldtmp->entry->name);
167 free (oldtmp->entry);
170 saved_hardlinks = NULL;
171 pending_hardlinks = 0;
173 return(EXIT_FAILURE);
176 if (S_ISLNK(file_header->mode)) {
177 file_header->link_name = (char *) xmalloc(file_header->size + 1);
178 archive_xread_all(archive_handle, file_header->link_name, file_header->size);
179 file_header->link_name[file_header->size] = '\0';
180 archive_handle->offset += file_header->size;
181 file_header->size = 0; /* Stop possible seeks in future */
183 if (nlink > 1 && !S_ISDIR(file_header->mode)) {
184 if (file_header->size == 0) { /* Put file on a linked list for later */
185 hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
186 new->next = saved_hardlinks;
188 new->entry = file_header;
189 saved_hardlinks = new;
191 } else { /* Found the file with data in */
192 hardlinks_t *tmp = saved_hardlinks;
193 pending_hardlinks = 1;
195 if (tmp->inode == inode) {
196 tmp->entry->link_name = xstrdup(file_header->name);
202 error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
206 file_header->device = (major << 8) | minor;
208 extract_flag = FALSE;
209 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
214 /* Check if the file already exists */
215 if (lstat (file_header->name, &statbuf) == 0) {
216 if ((archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) || (statbuf.st_mtime < file_header->mtime)) {
217 /* Remove file if flag set or its older than the file to be extracted */
218 if (unlink(file_header->name) == -1) {
219 perror_msg_and_die("Couldnt remove old file");
222 if (! archive_handle->flags & ARCHIVE_EXTRACT_QUIET) {
223 error_msg("%s not created: newer or same age file exists", file_header->name);
225 extract_flag = FALSE;
228 archive_handle->action_header(file_header);
231 archive_handle->action_header(file_header);
233 archive_handle->action_data(archive_handle);
235 data_skip(archive_handle);
237 archive_handle->offset += file_header->size;
240 return(EXIT_SUCCESS);