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)
33 static const char trailer[] ALIGN1 = "TRAILER!!!";
39 struct inodes_s *next;
44 struct inodes_s *links = NULL;
45 off_t bytes = 0; /* output bytes count */
52 line = xmalloc_fgetline(stdin);
55 /* Strip leading "./[./]..." from the filename */
57 while (name[0] == '.' && name[1] == '/') {
58 while (*++name == '/')
61 if (!*name) { /* line is empty */
65 if (lstat(name, &st)) {
67 bb_simple_perror_msg_and_die(name);
70 if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
71 st.st_size = 0; /* paranoia */
73 /* Store hardlinks for later processing, dont output them */
74 if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
78 /* Do we have this hardlink remembered? */
82 /* Not found: add new item to "links" list */
83 l = xzalloc(sizeof(*l));
89 if (l->st.st_ino == st.st_ino) {
95 /* Add new name to "l->names" list */
96 n = xmalloc(sizeof(*n) + strlen(name));
97 strcpy(n->name, name);
105 } else { /* line == NULL: EOF */
108 /* Output hardlink's data */
110 name = links->names->name;
111 links->names = links->names->next;
112 /* GNU cpio is reported to emit file data
113 * only for the last instance. Mimic that. */
114 if (links->names == NULL)
118 /* NB: we leak links->names and/or links,
119 * this is intended (we exit soon anyway) */
121 /* If no (more) hardlinks to output,
122 * output "trailer" entry */
124 /* st.st_size == 0 is a must, but for uniformity
125 * in the output, we zero out everything */
126 memset(&st, 0, sizeof(st));
127 /* st.st_nlink = 1; - GNU cpio does this */
131 bytes += printf("070701"
132 "%08X%08X%08X%08X%08X%08X%08X"
133 "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
134 /* strlen+1: */ "%08X"
135 /* chksum: */ "00000000" /* (only for "070702" files) */
136 /* name,NUL: */ "%s%c",
137 (unsigned)(uint32_t) st.st_ino,
138 (unsigned)(uint32_t) st.st_mode,
139 (unsigned)(uint32_t) st.st_uid,
140 (unsigned)(uint32_t) st.st_gid,
141 (unsigned)(uint32_t) st.st_nlink,
142 (unsigned)(uint32_t) st.st_mtime,
143 (unsigned)(uint32_t) st.st_size,
144 (unsigned)(uint32_t) major(st.st_dev),
145 (unsigned)(uint32_t) minor(st.st_dev),
146 (unsigned)(uint32_t) major(st.st_rdev),
147 (unsigned)(uint32_t) minor(st.st_rdev),
148 (unsigned)(strlen(name) + 1),
150 bytes = cpio_pad4(bytes);
153 if (S_ISLNK(st.st_mode)) {
154 char *lpath = xmalloc_readlink_or_warn(name);
157 bytes += printf("%s", lpath);
159 } else { /* S_ISREG */
160 int fd = xopen(name, O_RDONLY);
162 /* We must abort if file got shorter too! */
163 bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
167 bytes = cpio_pad4(bytes);
173 /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
178 } /* end of "while (1)" */
182 /* GNU cpio 2.9 --help (abridged):
185 -i, --extract Extract files from an archive
186 -o, --create Create the archive
187 -p, --pass-through Copy-pass mode [was ist das?!]
188 -t, --list List the archive
190 Options valid in any mode:
191 --block-size=SIZE I/O block size = SIZE * 512 bytes
192 -B I/O block size = 5120 bytes
193 -c Use the old portable (ASCII) archive format
194 -C, --io-size=NUMBER I/O block size in bytes
195 -f, --nonmatching Only copy files that do not match given pattern
196 -F, --file=FILE Use FILE instead of standard input or output
197 -H, --format=FORMAT Use given archive FORMAT
198 -M, --message=STRING Print STRING when the end of a volume of the
199 backup media is reached
200 -n, --numeric-uid-gid If -v, show numeric UID and GID
201 --quiet Do not print the number of blocks copied
202 --rsh-command=COMMAND Use remote COMMAND instead of rsh
203 -v, --verbose Verbosely list the files processed
204 -V, --dot Print a "." for each file processed
205 -W, --warning=FLAG Control warning display: 'none','truncate','all';
206 multiple options accumulate
208 Options valid only in --extract mode:
209 -b, --swap Swap both halfwords of words and bytes of
210 halfwords in the data (equivalent to -sS)
211 -r, --rename Interactively rename files
212 -s, --swap-bytes Swap the bytes of each halfword in the files
213 -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
214 --to-stdout Extract files to standard output
215 -E, --pattern-file=FILE Read additional patterns specifying filenames to
216 extract or list from FILE
217 --only-verify-crc Verify CRC's, don't actually extract the files
219 Options valid only in --create mode:
220 -A, --append Append to an existing archive
221 -O FILE File to use instead of standard output
223 Options valid only in --pass-through mode:
224 -l, --link Link files instead of copying them, when possible
226 Options valid in --extract and --create modes:
227 --absolute-filenames Do not strip file system prefix components from
229 --no-absolute-filenames Create all files relative to the current dir
231 Options valid in --create and --pass-through modes:
232 -0, --null A list of filenames is terminated by a NUL
233 -a, --reset-access-time Reset the access times of files after reading them
234 -I FILE File to use instead of standard input
235 -L, --dereference Dereference symbolic links (copy the files
236 that they point to instead of copying the links)
237 -R, --owner=[USER][:.][GROUP] Set owner of created files
239 Options valid in --extract and --pass-through modes:
240 -d, --make-directories Create leading directories where needed
241 -m, --preserve-modification-time Retain mtime when creating files
242 --no-preserve-owner Do not change the ownership of the files
243 --sparse Write files with blocks of zeros as sparse files
244 -u, --unconditional Replace all files unconditionally
247 int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
248 int cpio_main(int argc UNUSED_PARAM, char **argv)
250 archive_handle_t *archive_handle;
252 USE_FEATURE_CPIO_O(const char *cpio_fmt = "";)
255 CPIO_OPT_EXTRACT = (1 << 0),
256 CPIO_OPT_TEST = (1 << 1),
257 CPIO_OPT_UNCONDITIONAL = (1 << 2),
258 CPIO_OPT_VERBOSE = (1 << 3),
259 CPIO_OPT_FILE = (1 << 4),
260 CPIO_OPT_CREATE_LEADING_DIR = (1 << 5),
261 CPIO_OPT_PRESERVE_MTIME = (1 << 6),
262 CPIO_OPT_CREATE = (1 << 7),
263 CPIO_OPT_FORMAT = (1 << 8),
266 #if ENABLE_GETOPT_LONG
267 applet_long_options =
268 "extract\0" No_argument "i"
269 "list\0" No_argument "t"
270 #if ENABLE_FEATURE_CPIO_O
271 "create\0" No_argument "o"
272 "format\0" Required_argument "H"
278 archive_handle = init_handle();
279 archive_handle->src_fd = STDIN_FILENO;
280 archive_handle->seek = seek_by_read;
281 archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
283 #if ENABLE_FEATURE_CPIO_O
284 opt = getopt32(argv, "ituvF:dmoH:", &cpio_filename, &cpio_fmt);
286 if (opt & CPIO_OPT_CREATE) {
287 if (*cpio_fmt != 'n')
289 if (opt & CPIO_OPT_FILE) {
291 stdout = fopen_for_write(cpio_filename);
292 /* Paranoia: I don't trust libc that much */
293 xdup2(fileno(stdout), STDOUT_FILENO);
298 opt = getopt32(argv, "ituvF:dm", &cpio_filename);
302 /* One of either extract or test options must be given */
303 if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) {
307 if (opt & CPIO_OPT_TEST) {
308 /* if both extract and test options are given, ignore extract option */
309 if (opt & CPIO_OPT_EXTRACT) {
310 opt &= ~CPIO_OPT_EXTRACT;
312 archive_handle->action_header = header_list;
314 if (opt & CPIO_OPT_EXTRACT) {
315 archive_handle->action_data = data_extract_all;
317 if (opt & CPIO_OPT_UNCONDITIONAL) {
318 archive_handle->ah_flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
319 archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
321 if (opt & CPIO_OPT_VERBOSE) {
322 if (archive_handle->action_header == header_list) {
323 archive_handle->action_header = header_verbose_list;
325 archive_handle->action_header = header_list;
328 if (opt & CPIO_OPT_FILE) { /* -F */
329 archive_handle->src_fd = xopen(cpio_filename, O_RDONLY);
330 archive_handle->seek = seek_by_jump;
332 if (opt & CPIO_OPT_CREATE_LEADING_DIR) {
333 archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
335 if (opt & CPIO_OPT_PRESERVE_MTIME) {
336 archive_handle->ah_flags |= ARCHIVE_PRESERVE_DATE;
340 archive_handle->filter = filter_accept_list;
341 llist_add_to(&(archive_handle->accept), *argv);
345 /* see get_header_cpio */
346 archive_handle->ah_priv[2] = (void*) ~(ptrdiff_t)0;
347 while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
350 if (archive_handle->ah_priv[2] != (void*) ~(ptrdiff_t)0)
351 printf("%lu blocks\n", (unsigned long)(ptrdiff_t)(archive_handle->ah_priv[2]));