1 /* vi: set sw=4 ts=4: */
3 * Mini cpio implementation for busybox
5 * Copyright (C) 2001 by Glenn McGrath
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 * Only supports new ASCII and CRC formats
15 #include "unarchive.h"
17 #if ENABLE_FEATURE_CPIO_O
18 static off_t cpio_pad4(off_t size)
29 /* Return value will become exit code.
30 * It's ok to exit instead of return. */
31 static int cpio_o(void)
38 struct inodes_s *next;
43 struct inodes_s *links = NULL;
44 off_t bytes = 0; /* output bytes count */
51 line = xmalloc_fgetline(stdin);
54 /* Strip leading "./[./]..." from the filename */
56 while (name[0] == '.' && name[1] == '/') {
57 while (*++name == '/')
60 if (!*name) { /* line is empty */
64 if (lstat(name, &st)) {
66 bb_simple_perror_msg_and_die(name);
69 if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
70 st.st_size = 0; /* paranoia */
72 /* Store hardlinks for later processing, dont output them */
73 if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
77 /* Do we have this hardlink remembered? */
81 /* Not found: add new item to "links" list */
82 l = xzalloc(sizeof(*l));
88 if (l->st.st_ino == st.st_ino) {
94 /* Add new name to "l->names" list */
95 n = xmalloc(sizeof(*n) + strlen(name));
96 strcpy(n->name, name);
104 } else { /* line == NULL: EOF */
107 /* Output hardlink's data */
109 name = links->names->name;
110 links->names = links->names->next;
111 /* GNU cpio is reported to emit file data
112 * only for the last instance. Mimic that. */
113 if (links->names == NULL)
117 /* NB: we leak links->names and/or links,
118 * this is intended (we exit soon anyway) */
120 /* If no (more) hardlinks to output,
121 * output "trailer" entry */
123 /* st.st_size == 0 is a must, but for uniformity
124 * in the output, we zero out everything */
125 memset(&st, 0, sizeof(st));
126 /* st.st_nlink = 1; - GNU cpio does this */
130 bytes += printf("070701"
131 "%08X%08X%08X%08X%08X%08X%08X"
132 "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
133 /* strlen+1: */ "%08X"
134 /* chksum: */ "00000000" /* (only for "070702" files) */
135 /* name,NUL: */ "%s%c",
136 (unsigned)(uint32_t) st.st_ino,
137 (unsigned)(uint32_t) st.st_mode,
138 (unsigned)(uint32_t) st.st_uid,
139 (unsigned)(uint32_t) st.st_gid,
140 (unsigned)(uint32_t) st.st_nlink,
141 (unsigned)(uint32_t) st.st_mtime,
142 (unsigned)(uint32_t) st.st_size,
143 (unsigned)(uint32_t) major(st.st_dev),
144 (unsigned)(uint32_t) minor(st.st_dev),
145 (unsigned)(uint32_t) major(st.st_rdev),
146 (unsigned)(uint32_t) minor(st.st_rdev),
147 (unsigned)(strlen(name) + 1),
149 bytes = cpio_pad4(bytes);
152 if (S_ISLNK(st.st_mode)) {
153 char *lpath = xmalloc_readlink_or_warn(name);
156 bytes += printf("%s", lpath);
158 } else { /* S_ISREG */
159 int fd = xopen(name, O_RDONLY);
161 /* We must abort if file got shorter too! */
162 bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
166 bytes = cpio_pad4(bytes);
172 /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
177 } /* end of "while (1)" */
181 /* GNU cpio 2.9 --help (abridged):
184 -i, --extract Extract files from an archive
185 -o, --create Create the archive
186 -p, --pass-through Copy-pass mode [was ist das?!]
187 -t, --list List the archive
189 Options valid in any mode:
190 --block-size=SIZE I/O block size = SIZE * 512 bytes
191 -B I/O block size = 5120 bytes
192 -c Use the old portable (ASCII) archive format
193 -C, --io-size=NUMBER I/O block size in bytes
194 -f, --nonmatching Only copy files that do not match given pattern
195 -F, --file=FILE Use FILE instead of standard input or output
196 -H, --format=FORMAT Use given archive FORMAT
197 -M, --message=STRING Print STRING when the end of a volume of the
198 backup media is reached
199 -n, --numeric-uid-gid If -v, show numeric UID and GID
200 --quiet Do not print the number of blocks copied
201 --rsh-command=COMMAND Use remote COMMAND instead of rsh
202 -v, --verbose Verbosely list the files processed
203 -V, --dot Print a "." for each file processed
204 -W, --warning=FLAG Control warning display: 'none','truncate','all';
205 multiple options accumulate
207 Options valid only in --extract mode:
208 -b, --swap Swap both halfwords of words and bytes of
209 halfwords in the data (equivalent to -sS)
210 -r, --rename Interactively rename files
211 -s, --swap-bytes Swap the bytes of each halfword in the files
212 -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
213 --to-stdout Extract files to standard output
214 -E, --pattern-file=FILE Read additional patterns specifying filenames to
215 extract or list from FILE
216 --only-verify-crc Verify CRC's, don't actually extract the files
218 Options valid only in --create mode:
219 -A, --append Append to an existing archive
220 -O FILE File to use instead of standard output
222 Options valid only in --pass-through mode:
223 -l, --link Link files instead of copying them, when possible
225 Options valid in --extract and --create modes:
226 --absolute-filenames Do not strip file system prefix components from
228 --no-absolute-filenames Create all files relative to the current dir
230 Options valid in --create and --pass-through modes:
231 -0, --null A list of filenames is terminated by a NUL
232 -a, --reset-access-time Reset the access times of files after reading them
233 -I FILE File to use instead of standard input
234 -L, --dereference Dereference symbolic links (copy the files
235 that they point to instead of copying the links)
236 -R, --owner=[USER][:.][GROUP] Set owner of created files
238 Options valid in --extract and --pass-through modes:
239 -d, --make-directories Create leading directories where needed
240 -m, --preserve-modification-time Retain mtime when creating files
241 --no-preserve-owner Do not change the ownership of the files
242 --sparse Write files with blocks of zeros as sparse files
243 -u, --unconditional Replace all files unconditionally
246 int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
247 int cpio_main(int argc UNUSED_PARAM, char **argv)
249 archive_handle_t *archive_handle;
251 USE_FEATURE_CPIO_O(const char *cpio_fmt = "";)
254 CPIO_OPT_EXTRACT = (1 << 0),
255 CPIO_OPT_TEST = (1 << 1),
256 CPIO_OPT_UNCONDITIONAL = (1 << 2),
257 CPIO_OPT_VERBOSE = (1 << 3),
258 CPIO_OPT_FILE = (1 << 4),
259 CPIO_OPT_CREATE_LEADING_DIR = (1 << 5),
260 CPIO_OPT_PRESERVE_MTIME = (1 << 6),
261 CPIO_OPT_CREATE = (1 << 7),
262 CPIO_OPT_FORMAT = (1 << 8),
265 #if ENABLE_GETOPT_LONG
266 applet_long_options =
267 "extract\0" No_argument "i"
268 "list\0" No_argument "t"
269 #if ENABLE_FEATURE_CPIO_O
270 "create\0" No_argument "o"
271 "format\0" Required_argument "H"
277 archive_handle = init_handle();
278 archive_handle->src_fd = STDIN_FILENO;
279 archive_handle->seek = seek_by_read;
280 archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
282 #if ENABLE_FEATURE_CPIO_O
283 opt = getopt32(argv, "ituvF:dmoH:", &cpio_filename, &cpio_fmt);
285 if (opt & CPIO_OPT_CREATE) {
286 if (*cpio_fmt != 'n')
288 if (opt & CPIO_OPT_FILE) {
290 stdout = fopen_for_write(cpio_filename);
291 /* Paranoia: I don't trust libc that much */
292 xdup2(fileno(stdout), STDOUT_FILENO);
297 opt = getopt32(argv, "ituvF:dm", &cpio_filename);
301 /* One of either extract or test options must be given */
302 if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) {
306 if (opt & CPIO_OPT_TEST) {
307 /* if both extract and test options are given, ignore extract option */
308 if (opt & CPIO_OPT_EXTRACT) {
309 opt &= ~CPIO_OPT_EXTRACT;
311 archive_handle->action_header = header_list;
313 if (opt & CPIO_OPT_EXTRACT) {
314 archive_handle->action_data = data_extract_all;
316 if (opt & CPIO_OPT_UNCONDITIONAL) {
317 archive_handle->ah_flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
318 archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
320 if (opt & CPIO_OPT_VERBOSE) {
321 if (archive_handle->action_header == header_list) {
322 archive_handle->action_header = header_verbose_list;
324 archive_handle->action_header = header_list;
327 if (opt & CPIO_OPT_FILE) { /* -F */
328 archive_handle->src_fd = xopen(cpio_filename, O_RDONLY);
329 archive_handle->seek = seek_by_jump;
331 if (opt & CPIO_OPT_CREATE_LEADING_DIR) {
332 archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
334 if (opt & CPIO_OPT_PRESERVE_MTIME) {
335 archive_handle->ah_flags |= ARCHIVE_PRESERVE_DATE;
339 archive_handle->filter = filter_accept_list;
340 llist_add_to(&(archive_handle->accept), *argv);
344 /* see get_header_cpio */
345 archive_handle->ah_priv[2] = (void*) ~(ptrdiff_t)0;
346 while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
349 if (archive_handle->ah_priv[2] != (void*) ~(ptrdiff_t)0)
350 printf("%lu blocks\n", (unsigned long)(ptrdiff_t)(archive_handle->ah_priv[2]));