blob: 94303389e6ec5abb3ead46a10ac345e0efebb858 [file] [log] [blame]
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +00001/* vi: set sw=4 ts=4: */
2/*
3 * Mini cpio implementation for busybox
4 *
Eric Andersenc7bda1c2004-03-15 08:29:22 +00005 * Copyright (C) 2001 by Glenn McGrath
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +00006 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02007 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +00008 *
9 * Limitations:
Denis Vlasenko261f2372008-04-05 00:07:46 +000010 * Doesn't check CRC's
11 * Only supports new ASCII and CRC formats
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +000012 */
Denys Vlasenkof6beef62013-11-14 11:39:00 +010013//config:config CPIO
Denys Vlasenkob097a842018-12-28 03:20:17 +010014//config: bool "cpio (15 kb)"
Denys Vlasenkof6beef62013-11-14 11:39:00 +010015//config: default y
16//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020017//config: cpio is an archival utility program used to create, modify, and
18//config: extract contents from archives.
19//config: cpio has 110 bytes of overheads for every stored file.
Denys Vlasenkof6beef62013-11-14 11:39:00 +010020//config:
Denys Vlasenko72089cf2017-07-21 09:50:55 +020021//config: This implementation of cpio can extract cpio archives created in the
22//config: "newc" or "crc" format.
Denys Vlasenkof6beef62013-11-14 11:39:00 +010023//config:
Denys Vlasenko72089cf2017-07-21 09:50:55 +020024//config: Unless you have a specific application which requires cpio, you
25//config: should probably say N here.
Denys Vlasenkof6beef62013-11-14 11:39:00 +010026//config:
27//config:config FEATURE_CPIO_O
Denys Vlasenkof5604222017-01-10 14:58:54 +010028//config: bool "Support archive creation"
Denys Vlasenkof6beef62013-11-14 11:39:00 +010029//config: default y
30//config: depends on CPIO
31//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020032//config: This implementation of cpio can create cpio archives in the "newc"
33//config: format only.
Denys Vlasenkof6beef62013-11-14 11:39:00 +010034//config:
35//config:config FEATURE_CPIO_P
Denys Vlasenkof5604222017-01-10 14:58:54 +010036//config: bool "Support passthrough mode"
Denys Vlasenkof6beef62013-11-14 11:39:00 +010037//config: default y
38//config: depends on FEATURE_CPIO_O
39//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020040//config: Passthrough mode. Rarely used.
Denys Vlasenkof6beef62013-11-14 11:39:00 +010041
Denys Vlasenko36184a42013-11-14 09:54:24 +010042//applet:IF_CPIO(APPLET(cpio, BB_DIR_BIN, BB_SUID_DROP))
Denys Vlasenko0c4dbd42017-09-18 16:28:43 +020043
Denys Vlasenko66620fa2013-11-14 09:53:52 +010044//kbuild:lib-$(CONFIG_CPIO) += cpio.o
45
Denys Vlasenko1f937d62010-12-26 02:22:51 +010046//usage:#define cpio_trivial_usage
Aaro Koskinen2735bc02015-10-16 17:24:46 +020047//usage: "[-dmvu] [-F FILE] [-R USER[:GRP]]" IF_FEATURE_CPIO_O(" [-H newc]")
Denys Vlasenko1f937d62010-12-26 02:22:51 +010048//usage: " [-ti"IF_FEATURE_CPIO_O("o")"]" IF_FEATURE_CPIO_P(" [-p DIR]")
49//usage: " [EXTR_FILE]..."
50//usage:#define cpio_full_usage "\n\n"
Denys Vlasenkod2f42412016-07-08 12:52:24 +020051//usage: "Extract (-i) or list (-t) files from a cpio archive"
Denys Vlasenko1f937d62010-12-26 02:22:51 +010052//usage: IF_FEATURE_CPIO_O(", or"
Denys Vlasenkod2f42412016-07-08 12:52:24 +020053//usage: "\ntake file list from stdin and create an archive (-o)"
54//usage: IF_FEATURE_CPIO_P(" or copy files (-p)")
Denys Vlasenko1f937d62010-12-26 02:22:51 +010055//usage: )
56//usage: "\n"
57//usage: "\nMain operation mode:"
58//usage: "\n -t List"
59//usage: "\n -i Extract EXTR_FILEs (or all)"
60//usage: IF_FEATURE_CPIO_O(
61//usage: "\n -o Create (requires -H newc)"
62//usage: )
63//usage: IF_FEATURE_CPIO_P(
64//usage: "\n -p DIR Copy files to DIR"
65//usage: )
Denys Vlasenko184b2662014-06-30 17:19:17 +020066//usage: "\nOptions:"
Denys Vlasenko4d0e2d52018-07-06 20:49:08 +020067//usage: IF_FEATURE_CPIO_O(
68//usage: "\n -H newc Archive format"
69//usage: )
Denys Vlasenko1f937d62010-12-26 02:22:51 +010070//usage: "\n -d Make leading directories"
Denys Vlasenkoa2f18d92020-12-18 04:12:51 +010071//usage: "\n -m Restore mtime"
Denys Vlasenko1f937d62010-12-26 02:22:51 +010072//usage: "\n -v Verbose"
73//usage: "\n -u Overwrite"
74//usage: "\n -F FILE Input (-t,-i,-p) or output (-o) file"
Aaro Koskinen2735bc02015-10-16 17:24:46 +020075//usage: "\n -R USER[:GRP] Set owner of created files"
Denys Vlasenko4d0e2d52018-07-06 20:49:08 +020076//usage: "\n -L Dereference symlinks"
77//usage: "\n -0 Input is separated by NULs"
Denys Vlasenko1f937d62010-12-26 02:22:51 +010078
Denis Vlasenko05af8322009-03-20 23:01:48 +000079/* GNU cpio 2.9 --help (abridged):
80
81 Modes:
82 -t, --list List the archive
83 -i, --extract Extract files from an archive
84 -o, --create Create the archive
Denys Vlasenko1f937d62010-12-26 02:22:51 +010085 -p, --pass-through Copy-pass mode
Denis Vlasenko05af8322009-03-20 23:01:48 +000086
87 Options valid in any mode:
88 --block-size=SIZE I/O block size = SIZE * 512 bytes
89 -B I/O block size = 5120 bytes
90 -c Use the old portable (ASCII) archive format
91 -C, --io-size=NUMBER I/O block size in bytes
92 -f, --nonmatching Only copy files that do not match given pattern
93 -F, --file=FILE Use FILE instead of standard input or output
94 -H, --format=FORMAT Use given archive FORMAT
95 -M, --message=STRING Print STRING when the end of a volume of the
96 backup media is reached
97 -n, --numeric-uid-gid If -v, show numeric UID and GID
98 --quiet Do not print the number of blocks copied
99 --rsh-command=COMMAND Use remote COMMAND instead of rsh
100 -v, --verbose Verbosely list the files processed
101 -V, --dot Print a "." for each file processed
102 -W, --warning=FLAG Control warning display: 'none','truncate','all';
103 multiple options accumulate
104
105 Options valid only in --extract mode:
106 -b, --swap Swap both halfwords of words and bytes of
107 halfwords in the data (equivalent to -sS)
108 -r, --rename Interactively rename files
109 -s, --swap-bytes Swap the bytes of each halfword in the files
110 -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
111 --to-stdout Extract files to standard output
112 -E, --pattern-file=FILE Read additional patterns specifying filenames to
113 extract or list from FILE
114 --only-verify-crc Verify CRC's, don't actually extract the files
115
116 Options valid only in --create mode:
117 -A, --append Append to an existing archive
118 -O FILE File to use instead of standard output
119
120 Options valid only in --pass-through mode:
121 -l, --link Link files instead of copying them, when possible
122
123 Options valid in --extract and --create modes:
124 --absolute-filenames Do not strip file system prefix components from
125 the file names
126 --no-absolute-filenames Create all files relative to the current dir
127
128 Options valid in --create and --pass-through modes:
129 -0, --null A list of filenames is terminated by a NUL
130 -a, --reset-access-time Reset the access times of files after reading them
131 -I FILE File to use instead of standard input
132 -L, --dereference Dereference symbolic links (copy the files
133 that they point to instead of copying the links)
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200134 -R, --owner=[USER][:.][GRP] Set owner of created files
Denis Vlasenko05af8322009-03-20 23:01:48 +0000135
136 Options valid in --extract and --pass-through modes:
137 -d, --make-directories Create leading directories where needed
138 -m, --preserve-modification-time Retain mtime when creating files
139 --no-preserve-owner Do not change the ownership of the files
140 --sparse Write files with blocks of zeros as sparse files
141 -u, --unconditional Replace all files unconditionally
142 */
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100143
Denys Vlasenko0c4dbd42017-09-18 16:28:43 +0200144#include "libbb.h"
145#include "common_bufsiz.h"
146#include "bb_archive.h"
147
Denis Vlasenko05af8322009-03-20 23:01:48 +0000148enum {
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100149 OPT_EXTRACT = (1 << 0),
150 OPT_TEST = (1 << 1),
151 OPT_NUL_TERMINATED = (1 << 2),
152 OPT_UNCONDITIONAL = (1 << 3),
153 OPT_VERBOSE = (1 << 4),
154 OPT_CREATE_LEADING_DIR = (1 << 5),
155 OPT_PRESERVE_MTIME = (1 << 6),
156 OPT_DEREF = (1 << 7),
157 OPT_FILE = (1 << 8),
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200158 OPT_OWNER = (1 << 9),
159 OPTBIT_OWNER = 9,
Denys Vlasenkod30b89c2009-06-26 01:55:45 +0200160 IF_FEATURE_CPIO_O(OPTBIT_CREATE ,)
161 IF_FEATURE_CPIO_O(OPTBIT_FORMAT ,)
162 IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,)
163 IF_LONG_OPTS( OPTBIT_QUIET ,)
164 IF_LONG_OPTS( OPTBIT_2STDOUT ,)
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100165 OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0,
166 OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0,
167 OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0,
168 OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0,
169 OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0,
Denis Vlasenko05af8322009-03-20 23:01:48 +0000170};
171
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200172#define OPTION_STR "it0uvdmLF:R:"
173
174struct globals {
175 struct bb_uidgid_t owner_ugid;
176} FIX_ALIASING;
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +0200177#define G (*(struct globals*)bb_common_bufsiz1)
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200178void BUG_cpio_globals_too_big(void);
179#define INIT_G() do { \
Denys Vlasenko47cfbf32016-04-21 18:18:48 +0200180 setup_common_bufsiz(); \
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200181 G.owner_ugid.uid = -1L; \
182 G.owner_ugid.gid = -1L; \
183} while (0)
Denis Vlasenko05af8322009-03-20 23:01:48 +0000184
Denis Vlasenko261f2372008-04-05 00:07:46 +0000185#if ENABLE_FEATURE_CPIO_O
186static off_t cpio_pad4(off_t size)
187{
188 int i;
189
190 i = (- size) & 3;
191 size += i;
192 while (--i >= 0)
193 bb_putchar('\0');
194 return size;
195}
196
197/* Return value will become exit code.
198 * It's ok to exit instead of return. */
Denys Vlasenkoa7bb3c12009-10-08 12:28:08 +0200199static NOINLINE int cpio_o(void)
Denis Vlasenko261f2372008-04-05 00:07:46 +0000200{
201 struct name_s {
202 struct name_s *next;
203 char name[1];
204 };
205 struct inodes_s {
206 struct inodes_s *next;
207 struct name_s *names;
208 struct stat st;
209 };
210
211 struct inodes_s *links = NULL;
212 off_t bytes = 0; /* output bytes count */
213
214 while (1) {
215 const char *name;
216 char *line;
217 struct stat st;
218
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100219 line = (option_mask32 & OPT_NUL_TERMINATED)
Denis Vlasenko05af8322009-03-20 23:01:48 +0000220 ? bb_get_chunk_from_file(stdin, NULL)
221 : xmalloc_fgetline(stdin);
Denis Vlasenko261f2372008-04-05 00:07:46 +0000222
223 if (line) {
224 /* Strip leading "./[./]..." from the filename */
225 name = line;
226 while (name[0] == '.' && name[1] == '/') {
227 while (*++name == '/')
228 continue;
229 }
230 if (!*name) { /* line is empty */
231 free(line);
232 continue;
233 }
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100234 if ((option_mask32 & OPT_DEREF)
Denis Vlasenko05af8322009-03-20 23:01:48 +0000235 ? stat(name, &st)
236 : lstat(name, &st)
237 ) {
Denis Vlasenko261f2372008-04-05 00:07:46 +0000238 abort_cpio_o:
239 bb_simple_perror_msg_and_die(name);
240 }
241
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200242 if (G.owner_ugid.uid != (uid_t)-1L)
243 st.st_uid = G.owner_ugid.uid;
244 if (G.owner_ugid.gid != (gid_t)-1L)
245 st.st_gid = G.owner_ugid.gid;
246
Denis Vlasenko261f2372008-04-05 00:07:46 +0000247 if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
248 st.st_size = 0; /* paranoia */
249
250 /* Store hardlinks for later processing, dont output them */
251 if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
252 struct name_s *n;
253 struct inodes_s *l;
254
255 /* Do we have this hardlink remembered? */
256 l = links;
257 while (1) {
258 if (l == NULL) {
259 /* Not found: add new item to "links" list */
260 l = xzalloc(sizeof(*l));
261 l->st = st;
262 l->next = links;
263 links = l;
264 break;
265 }
266 if (l->st.st_ino == st.st_ino) {
267 /* found */
268 break;
269 }
270 l = l->next;
271 }
272 /* Add new name to "l->names" list */
273 n = xmalloc(sizeof(*n) + strlen(name));
274 strcpy(n->name, name);
275 n->next = l->names;
276 l->names = n;
277
278 free(line);
279 continue;
280 }
Denis Vlasenko261f2372008-04-05 00:07:46 +0000281 } else { /* line == NULL: EOF */
282 next_link:
283 if (links) {
284 /* Output hardlink's data */
285 st = links->st;
286 name = links->names->name;
287 links->names = links->names->next;
288 /* GNU cpio is reported to emit file data
289 * only for the last instance. Mimic that. */
290 if (links->names == NULL)
291 links = links->next;
292 else
293 st.st_size = 0;
294 /* NB: we leak links->names and/or links,
295 * this is intended (we exit soon anyway) */
296 } else {
297 /* If no (more) hardlinks to output,
298 * output "trailer" entry */
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200299 name = cpio_TRAILER;
Denis Vlasenko261f2372008-04-05 00:07:46 +0000300 /* st.st_size == 0 is a must, but for uniformity
301 * in the output, we zero out everything */
302 memset(&st, 0, sizeof(st));
303 /* st.st_nlink = 1; - GNU cpio does this */
304 }
305 }
306
307 bytes += printf("070701"
Denys Vlasenko60cb48c2013-01-14 15:57:44 +0100308 "%08X%08X%08X%08X%08X%08X%08X"
309 "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
Denis Vlasenko261f2372008-04-05 00:07:46 +0000310 /* strlen+1: */ "%08X"
311 /* chksum: */ "00000000" /* (only for "070702" files) */
312 /* name,NUL: */ "%s%c",
Denys Vlasenko60cb48c2013-01-14 15:57:44 +0100313 (unsigned)(uint32_t) st.st_ino,
314 (unsigned)(uint32_t) st.st_mode,
315 (unsigned)(uint32_t) st.st_uid,
316 (unsigned)(uint32_t) st.st_gid,
317 (unsigned)(uint32_t) st.st_nlink,
318 (unsigned)(uint32_t) st.st_mtime,
319 (unsigned)(uint32_t) st.st_size,
320 (unsigned)(uint32_t) major(st.st_dev),
321 (unsigned)(uint32_t) minor(st.st_dev),
322 (unsigned)(uint32_t) major(st.st_rdev),
323 (unsigned)(uint32_t) minor(st.st_rdev),
324 (unsigned)(strlen(name) + 1),
325 name, '\0');
Denis Vlasenko261f2372008-04-05 00:07:46 +0000326 bytes = cpio_pad4(bytes);
327
328 if (st.st_size) {
329 if (S_ISLNK(st.st_mode)) {
330 char *lpath = xmalloc_readlink_or_warn(name);
331 if (!lpath)
332 goto abort_cpio_o;
333 bytes += printf("%s", lpath);
334 free(lpath);
335 } else { /* S_ISREG */
336 int fd = xopen(name, O_RDONLY);
Denys Vlasenko8131eea2009-11-02 14:19:51 +0100337 fflush_all();
Denis Vlasenko261f2372008-04-05 00:07:46 +0000338 /* We must abort if file got shorter too! */
Denis Vlasenko1af00ed2008-04-05 02:44:30 +0000339 bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
Denis Vlasenko261f2372008-04-05 00:07:46 +0000340 bytes += st.st_size;
341 close(fd);
342 }
343 bytes = cpio_pad4(bytes);
344 }
345
346 if (!line) {
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200347 if (name != cpio_TRAILER)
Denis Vlasenko261f2372008-04-05 00:07:46 +0000348 goto next_link;
349 /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
350 return EXIT_SUCCESS;
351 }
352
353 free(line);
354 } /* end of "while (1)" */
355}
356#endif
Glenn L McGrath10b78132004-02-25 09:30:06 +0000357
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +0000358int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000359int cpio_main(int argc UNUSED_PARAM, char **argv)
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +0000360{
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000361 archive_handle_t *archive_handle;
Denis Vlasenko261f2372008-04-05 00:07:46 +0000362 char *cpio_filename;
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200363 char *cpio_owner;
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000364 IF_FEATURE_CPIO_O(const char *cpio_fmt = "";)
Denis Vlasenko67b23e62006-10-03 21:00:06 +0000365 unsigned opt;
Denys Vlasenkof3b92d32009-06-19 12:10:38 +0200366#if ENABLE_LONG_OPTS
Denys Vlasenko036585a2017-08-08 16:38:18 +0200367 const char *long_opts =
Denis Vlasenko2b407b12008-07-11 21:42:12 +0000368 "extract\0" No_argument "i"
369 "list\0" No_argument "t"
370#if ENABLE_FEATURE_CPIO_O
371 "create\0" No_argument "o"
372 "format\0" Required_argument "H"
Denis Vlasenko83518d12009-03-20 22:17:13 +0000373#if ENABLE_FEATURE_CPIO_P
374 "pass-through\0" No_argument "p"
375#endif
Denis Vlasenko2b407b12008-07-11 21:42:12 +0000376#endif
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200377 "owner\0" Required_argument "R"
Denys Vlasenkod30b89c2009-06-26 01:55:45 +0200378 "verbose\0" No_argument "v"
Denys Vlasenko9be4d4f2018-07-06 20:50:30 +0200379 "null\0" No_argument "0"
Denys Vlasenkod30b89c2009-06-26 01:55:45 +0200380 "quiet\0" No_argument "\xff"
381 "to-stdout\0" No_argument "\xfe"
Denis Vlasenko2b407b12008-07-11 21:42:12 +0000382 ;
383#endif
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000384
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200385 INIT_G();
Denys Vlasenko607f65d2010-01-09 20:23:03 +0100386 archive_handle = init_handle();
387 /* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */
388 archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
389
Denis Vlasenko83518d12009-03-20 22:17:13 +0000390 /* As of now we do not enforce this: */
391 /* -i,-t,-o,-p are mutually exclusive */
392 /* -u,-d,-m make sense only with -i or -p */
Denis Vlasenko05af8322009-03-20 23:01:48 +0000393 /* -L makes sense only with -o or -p */
394
Denis Vlasenko83518d12009-03-20 22:17:13 +0000395#if !ENABLE_FEATURE_CPIO_O
Denys Vlasenko036585a2017-08-08 16:38:18 +0200396 opt = getopt32long(argv, OPTION_STR, long_opts, &cpio_filename, &cpio_owner);
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200397#else
Denys Vlasenko036585a2017-08-08 16:38:18 +0200398 opt = getopt32long(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), long_opts,
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200399 &cpio_filename, &cpio_owner, &cpio_fmt);
400#endif
Denys Vlasenkoff0e8752010-05-10 04:16:43 +0200401 argv += optind;
Aaro Koskinen2735bc02015-10-16 17:24:46 +0200402 if (opt & OPT_OWNER) { /* -R */
403 parse_chown_usergroup_or_die(&G.owner_ugid, cpio_owner);
404 archive_handle->cpio__owner = G.owner_ugid;
405 }
406#if !ENABLE_FEATURE_CPIO_O
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100407 if (opt & OPT_FILE) { /* -F */
Denys Vlasenko02dd96f2010-01-09 20:25:42 +0100408 xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
Denys Vlasenko607f65d2010-01-09 20:23:03 +0100409 }
Denis Vlasenko83518d12009-03-20 22:17:13 +0000410#else
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100411 if ((opt & (OPT_FILE|OPT_CREATE)) == OPT_FILE) { /* -F without -o */
Denys Vlasenko607f65d2010-01-09 20:23:03 +0100412 xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
413 }
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100414 if (opt & OPT_PASSTHROUGH) {
Denis Vlasenko83518d12009-03-20 22:17:13 +0000415 pid_t pid;
416 struct fd_pair pp;
Glenn L McGrath10b78132004-02-25 09:30:06 +0000417
Denys Vlasenko40e5a302010-01-04 14:30:37 +0100418 if (argv[0] == NULL)
Denis Vlasenko83518d12009-03-20 22:17:13 +0000419 bb_show_usage();
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100420 if (opt & OPT_CREATE_LEADING_DIR)
Denys Vlasenko40e5a302010-01-04 14:30:37 +0100421 mkdir(argv[0], 0777);
Denis Vlasenko83518d12009-03-20 22:17:13 +0000422 /* Crude existence check:
Denys Vlasenko40e5a302010-01-04 14:30:37 +0100423 * close(xopen(argv[0], O_RDONLY | O_DIRECTORY));
Denis Vlasenko83518d12009-03-20 22:17:13 +0000424 * We can also xopen, fstat, IS_DIR, later fchdir.
425 * This would check for existence earlier and cleaner.
426 * As it stands now, if we fail xchdir later,
427 * child dies on EPIPE, unless it caught
428 * a diffrerent problem earlier.
429 * This is good enough for now.
430 */
431#if !BB_MMU
432 pp.rd = 3;
433 pp.wr = 4;
434 if (!re_execed) {
435 close(3);
436 close(4);
437 xpiped_pair(pp);
438 }
439#else
440 xpiped_pair(pp);
441#endif
Denys Vlasenko40e5a302010-01-04 14:30:37 +0100442 pid = fork_or_rexec(argv - optind);
Denis Vlasenko83518d12009-03-20 22:17:13 +0000443 if (pid == 0) { /* child */
444 close(pp.rd);
445 xmove_fd(pp.wr, STDOUT_FILENO);
446 goto dump;
447 }
448 /* parent */
Denys Vlasenkod2277e22011-11-22 17:19:26 +0100449 USE_FOR_NOMMU(argv[-optind][0] &= 0x7f); /* undo fork_or_rexec() damage */
Denys Vlasenko40e5a302010-01-04 14:30:37 +0100450 xchdir(*argv++);
Denis Vlasenko83518d12009-03-20 22:17:13 +0000451 close(pp.wr);
452 xmove_fd(pp.rd, STDIN_FILENO);
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100453 //opt &= ~OPT_PASSTHROUGH;
454 opt |= OPT_EXTRACT;
Denis Vlasenko83518d12009-03-20 22:17:13 +0000455 goto skip;
456 }
457 /* -o */
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100458 if (opt & OPT_CREATE) {
Denys Vlasenko93ac7d82010-01-09 19:56:15 +0100459 if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */
Denis Vlasenko261f2372008-04-05 00:07:46 +0000460 bb_show_usage();
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100461 if (opt & OPT_FILE) {
Denys Vlasenkoc05387d2010-10-18 02:38:27 +0200462 xmove_fd(xopen(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
Denis Vlasenko261f2372008-04-05 00:07:46 +0000463 }
Denis Vlasenko83518d12009-03-20 22:17:13 +0000464 dump:
Denis Vlasenko261f2372008-04-05 00:07:46 +0000465 return cpio_o();
466 }
Denis Vlasenko83518d12009-03-20 22:17:13 +0000467 skip:
Denis Vlasenko261f2372008-04-05 00:07:46 +0000468#endif
Glenn L McGrath10b78132004-02-25 09:30:06 +0000469
470 /* One of either extract or test options must be given */
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100471 if ((opt & (OPT_TEST | OPT_EXTRACT)) == 0) {
Glenn L McGrath10b78132004-02-25 09:30:06 +0000472 bb_show_usage();
473 }
474
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100475 if (opt & OPT_TEST) {
Rob Landleyb7128c62005-09-11 01:05:30 +0000476 /* if both extract and test options are given, ignore extract option */
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100477 opt &= ~OPT_EXTRACT;
Glenn L McGrath10b78132004-02-25 09:30:06 +0000478 archive_handle->action_header = header_list;
479 }
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100480 if (opt & OPT_EXTRACT) {
Glenn L McGrath10b78132004-02-25 09:30:06 +0000481 archive_handle->action_data = data_extract_all;
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100482 if (opt & OPT_2STDOUT)
Denys Vlasenkod30b89c2009-06-26 01:55:45 +0200483 archive_handle->action_data = data_extract_to_stdout;
Glenn L McGrath10b78132004-02-25 09:30:06 +0000484 }
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100485 if (opt & OPT_UNCONDITIONAL) {
Denys Vlasenkod57d6262009-09-17 02:43:14 +0200486 archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD;
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000487 archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
Glenn L McGrath10b78132004-02-25 09:30:06 +0000488 }
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100489 if (opt & OPT_VERBOSE) {
Glenn L McGrath10b78132004-02-25 09:30:06 +0000490 if (archive_handle->action_header == header_list) {
491 archive_handle->action_header = header_verbose_list;
492 } else {
493 archive_handle->action_header = header_list;
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +0000494 }
495 }
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100496 if (opt & OPT_CREATE_LEADING_DIR) {
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000497 archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
Glenn L McGrath10b78132004-02-25 09:30:06 +0000498 }
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100499 if (opt & OPT_PRESERVE_MTIME) {
Denys Vlasenkod57d6262009-09-17 02:43:14 +0200500 archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
Denis Vlasenkobbd55c92008-06-27 15:52:07 +0000501 }
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +0000502
Denis Vlasenko261f2372008-04-05 00:07:46 +0000503 while (*argv) {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000504 archive_handle->filter = filter_accept_list;
Denys Vlasenko40e5a302010-01-04 14:30:37 +0100505 llist_add_to(&archive_handle->accept, *argv);
Denis Vlasenko261f2372008-04-05 00:07:46 +0000506 argv++;
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +0000507 }
508
Denis Vlasenkocf4dd072008-10-17 14:11:04 +0000509 /* see get_header_cpio */
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100510 archive_handle->cpio__blocks = (off_t)-1;
Denis Vlasenko261f2372008-04-05 00:07:46 +0000511 while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
512 continue;
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000513
Harald van Dijk8c24af92018-05-22 17:34:31 +0200514 create_links_from_list(archive_handle->link_placeholders);
Natanael Copad9503222018-03-30 20:18:12 +0200515
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100516 if (archive_handle->cpio__blocks != (off_t)-1
Denys Vlasenko1f937d62010-12-26 02:22:51 +0100517 && !(opt & OPT_QUIET)
Denys Vlasenko607f65d2010-01-09 20:23:03 +0100518 ) {
Denys Vlasenko7c443d12020-06-24 00:27:37 +0200519 fflush_all();
Matheus Izvekov4640ccc2010-04-26 13:53:57 +0200520 fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks);
Denys Vlasenko607f65d2010-01-09 20:23:03 +0100521 }
Denis Vlasenkod83676e2008-10-17 14:03:56 +0000522
Denis Vlasenko079f8af2006-11-27 16:49:31 +0000523 return EXIT_SUCCESS;
Glenn L McGrath8f5b63e2001-06-22 09:22:06 +0000524}