source: MondoRescue/branches/3.3/mindi-busybox/archival/cpio.c@ 3667

Last change on this file since 3667 was 3621, checked in by Bruno Cornec, 9 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 15.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini cpio implementation for busybox
4 *
5 * Copyright (C) 2001 by Glenn McGrath
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 *
9 * Limitations:
10 * Doesn't check CRC's
11 * Only supports new ASCII and CRC formats
12 */
13#include "libbb.h"
14#include "common_bufsiz.h"
15#include "bb_archive.h"
16
17//config:config CPIO
18//config: bool "cpio"
19//config: default y
20//config: help
21//config: cpio is an archival utility program used to create, modify, and
22//config: extract contents from archives.
23//config: cpio has 110 bytes of overheads for every stored file.
24//config:
25//config: This implementation of cpio can extract cpio archives created in the
26//config: "newc" or "crc" format, it cannot create or modify them.
27//config:
28//config: Unless you have a specific application which requires cpio, you
29//config: should probably say N here.
30//config:
31//config:config FEATURE_CPIO_O
32//config: bool "Support for archive creation"
33//config: default y
34//config: depends on CPIO
35//config: help
36//config: This implementation of cpio can create cpio archives in the "newc"
37//config: format only.
38//config:
39//config:config FEATURE_CPIO_P
40//config: bool "Support for passthrough mode"
41//config: default y
42//config: depends on FEATURE_CPIO_O
43//config: help
44//config: Passthrough mode. Rarely used.
45
46//applet:IF_CPIO(APPLET(cpio, BB_DIR_BIN, BB_SUID_DROP))
47//kbuild:lib-$(CONFIG_CPIO) += cpio.o
48
49//usage:#define cpio_trivial_usage
50//usage: "[-dmvu] [-F FILE] [-R USER[:GRP]]" IF_FEATURE_CPIO_O(" [-H newc]")
51//usage: " [-ti"IF_FEATURE_CPIO_O("o")"]" IF_FEATURE_CPIO_P(" [-p DIR]")
52//usage: " [EXTR_FILE]..."
53//usage:#define cpio_full_usage "\n\n"
54//usage: "Extract or list files from a cpio archive"
55//usage: IF_FEATURE_CPIO_O(", or"
56//usage: "\ncreate an archive" IF_FEATURE_CPIO_P(" (-o) or copy files (-p)")
57//usage: " using file list on stdin"
58//usage: )
59//usage: "\n"
60//usage: "\nMain operation mode:"
61//usage: "\n -t List"
62//usage: "\n -i Extract EXTR_FILEs (or all)"
63//usage: IF_FEATURE_CPIO_O(
64//usage: "\n -o Create (requires -H newc)"
65//usage: )
66//usage: IF_FEATURE_CPIO_P(
67//usage: "\n -p DIR Copy files to DIR"
68//usage: )
69//usage: "\nOptions:"
70//usage: "\n -d Make leading directories"
71//usage: "\n -m Preserve mtime"
72//usage: "\n -v Verbose"
73//usage: "\n -u Overwrite"
74//usage: "\n -F FILE Input (-t,-i,-p) or output (-o) file"
75//usage: "\n -R USER[:GRP] Set owner of created files"
76//usage: IF_FEATURE_CPIO_O(
77//usage: "\n -H newc Archive format"
78//usage: )
79
80/* GNU cpio 2.9 --help (abridged):
81
82 Modes:
83 -t, --list List the archive
84 -i, --extract Extract files from an archive
85 -o, --create Create the archive
86 -p, --pass-through Copy-pass mode
87
88 Options valid in any mode:
89 --block-size=SIZE I/O block size = SIZE * 512 bytes
90 -B I/O block size = 5120 bytes
91 -c Use the old portable (ASCII) archive format
92 -C, --io-size=NUMBER I/O block size in bytes
93 -f, --nonmatching Only copy files that do not match given pattern
94 -F, --file=FILE Use FILE instead of standard input or output
95 -H, --format=FORMAT Use given archive FORMAT
96 -M, --message=STRING Print STRING when the end of a volume of the
97 backup media is reached
98 -n, --numeric-uid-gid If -v, show numeric UID and GID
99 --quiet Do not print the number of blocks copied
100 --rsh-command=COMMAND Use remote COMMAND instead of rsh
101 -v, --verbose Verbosely list the files processed
102 -V, --dot Print a "." for each file processed
103 -W, --warning=FLAG Control warning display: 'none','truncate','all';
104 multiple options accumulate
105
106 Options valid only in --extract mode:
107 -b, --swap Swap both halfwords of words and bytes of
108 halfwords in the data (equivalent to -sS)
109 -r, --rename Interactively rename files
110 -s, --swap-bytes Swap the bytes of each halfword in the files
111 -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
112 --to-stdout Extract files to standard output
113 -E, --pattern-file=FILE Read additional patterns specifying filenames to
114 extract or list from FILE
115 --only-verify-crc Verify CRC's, don't actually extract the files
116
117 Options valid only in --create mode:
118 -A, --append Append to an existing archive
119 -O FILE File to use instead of standard output
120
121 Options valid only in --pass-through mode:
122 -l, --link Link files instead of copying them, when possible
123
124 Options valid in --extract and --create modes:
125 --absolute-filenames Do not strip file system prefix components from
126 the file names
127 --no-absolute-filenames Create all files relative to the current dir
128
129 Options valid in --create and --pass-through modes:
130 -0, --null A list of filenames is terminated by a NUL
131 -a, --reset-access-time Reset the access times of files after reading them
132 -I FILE File to use instead of standard input
133 -L, --dereference Dereference symbolic links (copy the files
134 that they point to instead of copying the links)
135 -R, --owner=[USER][:.][GRP] Set owner of created files
136
137 Options valid in --extract and --pass-through modes:
138 -d, --make-directories Create leading directories where needed
139 -m, --preserve-modification-time Retain mtime when creating files
140 --no-preserve-owner Do not change the ownership of the files
141 --sparse Write files with blocks of zeros as sparse files
142 -u, --unconditional Replace all files unconditionally
143 */
144
145enum {
146 OPT_EXTRACT = (1 << 0),
147 OPT_TEST = (1 << 1),
148 OPT_NUL_TERMINATED = (1 << 2),
149 OPT_UNCONDITIONAL = (1 << 3),
150 OPT_VERBOSE = (1 << 4),
151 OPT_CREATE_LEADING_DIR = (1 << 5),
152 OPT_PRESERVE_MTIME = (1 << 6),
153 OPT_DEREF = (1 << 7),
154 OPT_FILE = (1 << 8),
155 OPT_OWNER = (1 << 9),
156 OPTBIT_OWNER = 9,
157 IF_FEATURE_CPIO_O(OPTBIT_CREATE ,)
158 IF_FEATURE_CPIO_O(OPTBIT_FORMAT ,)
159 IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,)
160 IF_LONG_OPTS( OPTBIT_QUIET ,)
161 IF_LONG_OPTS( OPTBIT_2STDOUT ,)
162 OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0,
163 OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0,
164 OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0,
165 OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0,
166 OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0,
167};
168
169#define OPTION_STR "it0uvdmLF:R:"
170
171struct globals {
172 struct bb_uidgid_t owner_ugid;
173} FIX_ALIASING;
174#define G (*(struct globals*)bb_common_bufsiz1)
175void BUG_cpio_globals_too_big(void);
176#define INIT_G() do { \
177 setup_common_bufsiz(); \
178 G.owner_ugid.uid = -1L; \
179 G.owner_ugid.gid = -1L; \
180} while (0)
181
182#if ENABLE_FEATURE_CPIO_O
183static off_t cpio_pad4(off_t size)
184{
185 int i;
186
187 i = (- size) & 3;
188 size += i;
189 while (--i >= 0)
190 bb_putchar('\0');
191 return size;
192}
193
194/* Return value will become exit code.
195 * It's ok to exit instead of return. */
196static NOINLINE int cpio_o(void)
197{
198 struct name_s {
199 struct name_s *next;
200 char name[1];
201 };
202 struct inodes_s {
203 struct inodes_s *next;
204 struct name_s *names;
205 struct stat st;
206 };
207
208 struct inodes_s *links = NULL;
209 off_t bytes = 0; /* output bytes count */
210
211 while (1) {
212 const char *name;
213 char *line;
214 struct stat st;
215
216 line = (option_mask32 & OPT_NUL_TERMINATED)
217 ? bb_get_chunk_from_file(stdin, NULL)
218 : xmalloc_fgetline(stdin);
219
220 if (line) {
221 /* Strip leading "./[./]..." from the filename */
222 name = line;
223 while (name[0] == '.' && name[1] == '/') {
224 while (*++name == '/')
225 continue;
226 }
227 if (!*name) { /* line is empty */
228 free(line);
229 continue;
230 }
231 if ((option_mask32 & OPT_DEREF)
232 ? stat(name, &st)
233 : lstat(name, &st)
234 ) {
235 abort_cpio_o:
236 bb_simple_perror_msg_and_die(name);
237 }
238
239 if (G.owner_ugid.uid != (uid_t)-1L)
240 st.st_uid = G.owner_ugid.uid;
241 if (G.owner_ugid.gid != (gid_t)-1L)
242 st.st_gid = G.owner_ugid.gid;
243
244 if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
245 st.st_size = 0; /* paranoia */
246
247 /* Store hardlinks for later processing, dont output them */
248 if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
249 struct name_s *n;
250 struct inodes_s *l;
251
252 /* Do we have this hardlink remembered? */
253 l = links;
254 while (1) {
255 if (l == NULL) {
256 /* Not found: add new item to "links" list */
257 l = xzalloc(sizeof(*l));
258 l->st = st;
259 l->next = links;
260 links = l;
261 break;
262 }
263 if (l->st.st_ino == st.st_ino) {
264 /* found */
265 break;
266 }
267 l = l->next;
268 }
269 /* Add new name to "l->names" list */
270 n = xmalloc(sizeof(*n) + strlen(name));
271 strcpy(n->name, name);
272 n->next = l->names;
273 l->names = n;
274
275 free(line);
276 continue;
277 }
278 } else { /* line == NULL: EOF */
279 next_link:
280 if (links) {
281 /* Output hardlink's data */
282 st = links->st;
283 name = links->names->name;
284 links->names = links->names->next;
285 /* GNU cpio is reported to emit file data
286 * only for the last instance. Mimic that. */
287 if (links->names == NULL)
288 links = links->next;
289 else
290 st.st_size = 0;
291 /* NB: we leak links->names and/or links,
292 * this is intended (we exit soon anyway) */
293 } else {
294 /* If no (more) hardlinks to output,
295 * output "trailer" entry */
296 name = cpio_TRAILER;
297 /* st.st_size == 0 is a must, but for uniformity
298 * in the output, we zero out everything */
299 memset(&st, 0, sizeof(st));
300 /* st.st_nlink = 1; - GNU cpio does this */
301 }
302 }
303
304 bytes += printf("070701"
305 "%08X%08X%08X%08X%08X%08X%08X"
306 "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
307 /* strlen+1: */ "%08X"
308 /* chksum: */ "00000000" /* (only for "070702" files) */
309 /* name,NUL: */ "%s%c",
310 (unsigned)(uint32_t) st.st_ino,
311 (unsigned)(uint32_t) st.st_mode,
312 (unsigned)(uint32_t) st.st_uid,
313 (unsigned)(uint32_t) st.st_gid,
314 (unsigned)(uint32_t) st.st_nlink,
315 (unsigned)(uint32_t) st.st_mtime,
316 (unsigned)(uint32_t) st.st_size,
317 (unsigned)(uint32_t) major(st.st_dev),
318 (unsigned)(uint32_t) minor(st.st_dev),
319 (unsigned)(uint32_t) major(st.st_rdev),
320 (unsigned)(uint32_t) minor(st.st_rdev),
321 (unsigned)(strlen(name) + 1),
322 name, '\0');
323 bytes = cpio_pad4(bytes);
324
325 if (st.st_size) {
326 if (S_ISLNK(st.st_mode)) {
327 char *lpath = xmalloc_readlink_or_warn(name);
328 if (!lpath)
329 goto abort_cpio_o;
330 bytes += printf("%s", lpath);
331 free(lpath);
332 } else { /* S_ISREG */
333 int fd = xopen(name, O_RDONLY);
334 fflush_all();
335 /* We must abort if file got shorter too! */
336 bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
337 bytes += st.st_size;
338 close(fd);
339 }
340 bytes = cpio_pad4(bytes);
341 }
342
343 if (!line) {
344 if (name != cpio_TRAILER)
345 goto next_link;
346 /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
347 return EXIT_SUCCESS;
348 }
349
350 free(line);
351 } /* end of "while (1)" */
352}
353#endif
354
355int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
356int cpio_main(int argc UNUSED_PARAM, char **argv)
357{
358 archive_handle_t *archive_handle;
359 char *cpio_filename;
360 char *cpio_owner;
361 IF_FEATURE_CPIO_O(const char *cpio_fmt = "";)
362 unsigned opt;
363
364#if ENABLE_LONG_OPTS
365 applet_long_options =
366 "extract\0" No_argument "i"
367 "list\0" No_argument "t"
368#if ENABLE_FEATURE_CPIO_O
369 "create\0" No_argument "o"
370 "format\0" Required_argument "H"
371#if ENABLE_FEATURE_CPIO_P
372 "pass-through\0" No_argument "p"
373#endif
374#endif
375 "owner\0" Required_argument "R"
376 "verbose\0" No_argument "v"
377 "quiet\0" No_argument "\xff"
378 "to-stdout\0" No_argument "\xfe"
379 ;
380#endif
381
382 INIT_G();
383 archive_handle = init_handle();
384 /* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */
385 archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
386
387 /* As of now we do not enforce this: */
388 /* -i,-t,-o,-p are mutually exclusive */
389 /* -u,-d,-m make sense only with -i or -p */
390 /* -L makes sense only with -o or -p */
391
392#if !ENABLE_FEATURE_CPIO_O
393 opt = getopt32(argv, OPTION_STR, &cpio_filename, &cpio_owner);
394#else
395 opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"),
396 &cpio_filename, &cpio_owner, &cpio_fmt);
397#endif
398 argv += optind;
399 if (opt & OPT_OWNER) { /* -R */
400 parse_chown_usergroup_or_die(&G.owner_ugid, cpio_owner);
401 archive_handle->cpio__owner = G.owner_ugid;
402 }
403#if !ENABLE_FEATURE_CPIO_O
404 if (opt & OPT_FILE) { /* -F */
405 xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
406 }
407#else
408 if ((opt & (OPT_FILE|OPT_CREATE)) == OPT_FILE) { /* -F without -o */
409 xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
410 }
411 if (opt & OPT_PASSTHROUGH) {
412 pid_t pid;
413 struct fd_pair pp;
414
415 if (argv[0] == NULL)
416 bb_show_usage();
417 if (opt & OPT_CREATE_LEADING_DIR)
418 mkdir(argv[0], 0777);
419 /* Crude existence check:
420 * close(xopen(argv[0], O_RDONLY | O_DIRECTORY));
421 * We can also xopen, fstat, IS_DIR, later fchdir.
422 * This would check for existence earlier and cleaner.
423 * As it stands now, if we fail xchdir later,
424 * child dies on EPIPE, unless it caught
425 * a diffrerent problem earlier.
426 * This is good enough for now.
427 */
428#if !BB_MMU
429 pp.rd = 3;
430 pp.wr = 4;
431 if (!re_execed) {
432 close(3);
433 close(4);
434 xpiped_pair(pp);
435 }
436#else
437 xpiped_pair(pp);
438#endif
439 pid = fork_or_rexec(argv - optind);
440 if (pid == 0) { /* child */
441 close(pp.rd);
442 xmove_fd(pp.wr, STDOUT_FILENO);
443 goto dump;
444 }
445 /* parent */
446 USE_FOR_NOMMU(argv[-optind][0] &= 0x7f); /* undo fork_or_rexec() damage */
447 xchdir(*argv++);
448 close(pp.wr);
449 xmove_fd(pp.rd, STDIN_FILENO);
450 //opt &= ~OPT_PASSTHROUGH;
451 opt |= OPT_EXTRACT;
452 goto skip;
453 }
454 /* -o */
455 if (opt & OPT_CREATE) {
456 if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */
457 bb_show_usage();
458 if (opt & OPT_FILE) {
459 xmove_fd(xopen(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
460 }
461 dump:
462 return cpio_o();
463 }
464 skip:
465#endif
466
467 /* One of either extract or test options must be given */
468 if ((opt & (OPT_TEST | OPT_EXTRACT)) == 0) {
469 bb_show_usage();
470 }
471
472 if (opt & OPT_TEST) {
473 /* if both extract and test options are given, ignore extract option */
474 opt &= ~OPT_EXTRACT;
475 archive_handle->action_header = header_list;
476 }
477 if (opt & OPT_EXTRACT) {
478 archive_handle->action_data = data_extract_all;
479 if (opt & OPT_2STDOUT)
480 archive_handle->action_data = data_extract_to_stdout;
481 }
482 if (opt & OPT_UNCONDITIONAL) {
483 archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD;
484 archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
485 }
486 if (opt & OPT_VERBOSE) {
487 if (archive_handle->action_header == header_list) {
488 archive_handle->action_header = header_verbose_list;
489 } else {
490 archive_handle->action_header = header_list;
491 }
492 }
493 if (opt & OPT_CREATE_LEADING_DIR) {
494 archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
495 }
496 if (opt & OPT_PRESERVE_MTIME) {
497 archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
498 }
499
500 while (*argv) {
501 archive_handle->filter = filter_accept_list;
502 llist_add_to(&archive_handle->accept, *argv);
503 argv++;
504 }
505
506 /* see get_header_cpio */
507 archive_handle->cpio__blocks = (off_t)-1;
508 while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
509 continue;
510
511 if (archive_handle->cpio__blocks != (off_t)-1
512 && !(opt & OPT_QUIET)
513 ) {
514 fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks);
515 }
516
517 return EXIT_SUCCESS;
518}
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