source: MondoRescue/branches/2.2.9/mindi-busybox/archival/cpio.c@ 3320

Last change on this file since 3320 was 3320, checked in by Bruno Cornec, 9 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 13.0 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 */
14#include "libbb.h"
15#include "archive.h"
16
17/* GNU cpio 2.9 --help (abridged):
18
19 Modes:
20 -t, --list List the archive
21 -i, --extract Extract files from an archive
22 -o, --create Create the archive
23 -p, --pass-through Copy-pass mode [was ist das?!]
24
25 Options valid in any mode:
26 --block-size=SIZE I/O block size = SIZE * 512 bytes
27 -B I/O block size = 5120 bytes
28 -c Use the old portable (ASCII) archive format
29 -C, --io-size=NUMBER I/O block size in bytes
30 -f, --nonmatching Only copy files that do not match given pattern
31 -F, --file=FILE Use FILE instead of standard input or output
32 -H, --format=FORMAT Use given archive FORMAT
33 -M, --message=STRING Print STRING when the end of a volume of the
34 backup media is reached
35 -n, --numeric-uid-gid If -v, show numeric UID and GID
36 --quiet Do not print the number of blocks copied
37 --rsh-command=COMMAND Use remote COMMAND instead of rsh
38 -v, --verbose Verbosely list the files processed
39 -V, --dot Print a "." for each file processed
40 -W, --warning=FLAG Control warning display: 'none','truncate','all';
41 multiple options accumulate
42
43 Options valid only in --extract mode:
44 -b, --swap Swap both halfwords of words and bytes of
45 halfwords in the data (equivalent to -sS)
46 -r, --rename Interactively rename files
47 -s, --swap-bytes Swap the bytes of each halfword in the files
48 -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
49 --to-stdout Extract files to standard output
50 -E, --pattern-file=FILE Read additional patterns specifying filenames to
51 extract or list from FILE
52 --only-verify-crc Verify CRC's, don't actually extract the files
53
54 Options valid only in --create mode:
55 -A, --append Append to an existing archive
56 -O FILE File to use instead of standard output
57
58 Options valid only in --pass-through mode:
59 -l, --link Link files instead of copying them, when possible
60
61 Options valid in --extract and --create modes:
62 --absolute-filenames Do not strip file system prefix components from
63 the file names
64 --no-absolute-filenames Create all files relative to the current dir
65
66 Options valid in --create and --pass-through modes:
67 -0, --null A list of filenames is terminated by a NUL
68 -a, --reset-access-time Reset the access times of files after reading them
69 -I FILE File to use instead of standard input
70 -L, --dereference Dereference symbolic links (copy the files
71 that they point to instead of copying the links)
72 -R, --owner=[USER][:.][GROUP] Set owner of created files
73
74 Options valid in --extract and --pass-through modes:
75 -d, --make-directories Create leading directories where needed
76 -m, --preserve-modification-time Retain mtime when creating files
77 --no-preserve-owner Do not change the ownership of the files
78 --sparse Write files with blocks of zeros as sparse files
79 -u, --unconditional Replace all files unconditionally
80 */
81enum {
82 CPIO_OPT_EXTRACT = (1 << 0),
83 CPIO_OPT_TEST = (1 << 1),
84 CPIO_OPT_NUL_TERMINATED = (1 << 2),
85 CPIO_OPT_UNCONDITIONAL = (1 << 3),
86 CPIO_OPT_VERBOSE = (1 << 4),
87 CPIO_OPT_CREATE_LEADING_DIR = (1 << 5),
88 CPIO_OPT_PRESERVE_MTIME = (1 << 6),
89 CPIO_OPT_DEREF = (1 << 7),
90 CPIO_OPT_FILE = (1 << 8),
91 OPTBIT_FILE = 8,
92 IF_FEATURE_CPIO_O(OPTBIT_CREATE ,)
93 IF_FEATURE_CPIO_O(OPTBIT_FORMAT ,)
94 IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,)
95 IF_LONG_OPTS( OPTBIT_QUIET ,)
96 IF_LONG_OPTS( OPTBIT_2STDOUT ,)
97 CPIO_OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0,
98 CPIO_OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0,
99 CPIO_OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0,
100 CPIO_OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0,
101 CPIO_OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0,
102};
103
104#define OPTION_STR "it0uvdmLF:"
105
106#if ENABLE_FEATURE_CPIO_O
107static off_t cpio_pad4(off_t size)
108{
109 int i;
110
111 i = (- size) & 3;
112 size += i;
113 while (--i >= 0)
114 bb_putchar('\0');
115 return size;
116}
117
118/* Return value will become exit code.
119 * It's ok to exit instead of return. */
120static NOINLINE int cpio_o(void)
121{
122 static const char trailer[] ALIGN1 = "TRAILER!!!";
123 struct name_s {
124 struct name_s *next;
125 char name[1];
126 };
127 struct inodes_s {
128 struct inodes_s *next;
129 struct name_s *names;
130 struct stat st;
131 };
132
133 struct inodes_s *links = NULL;
134 off_t bytes = 0; /* output bytes count */
135
136 while (1) {
137 const char *name;
138 char *line;
139 struct stat st;
140
141 line = (option_mask32 & CPIO_OPT_NUL_TERMINATED)
142 ? bb_get_chunk_from_file(stdin, NULL)
143 : xmalloc_fgetline(stdin);
144
145 if (line) {
146 /* Strip leading "./[./]..." from the filename */
147 name = line;
148 while (name[0] == '.' && name[1] == '/') {
149 while (*++name == '/')
150 continue;
151 }
152 if (!*name) { /* line is empty */
153 free(line);
154 continue;
155 }
156 if ((option_mask32 & CPIO_OPT_DEREF)
157 ? stat(name, &st)
158 : lstat(name, &st)
159 ) {
160 abort_cpio_o:
161 bb_simple_perror_msg_and_die(name);
162 }
163
164 if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
165 st.st_size = 0; /* paranoia */
166
167 /* Store hardlinks for later processing, dont output them */
168 if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
169 struct name_s *n;
170 struct inodes_s *l;
171
172 /* Do we have this hardlink remembered? */
173 l = links;
174 while (1) {
175 if (l == NULL) {
176 /* Not found: add new item to "links" list */
177 l = xzalloc(sizeof(*l));
178 l->st = st;
179 l->next = links;
180 links = l;
181 break;
182 }
183 if (l->st.st_ino == st.st_ino) {
184 /* found */
185 break;
186 }
187 l = l->next;
188 }
189 /* Add new name to "l->names" list */
190 n = xmalloc(sizeof(*n) + strlen(name));
191 strcpy(n->name, name);
192 n->next = l->names;
193 l->names = n;
194
195 free(line);
196 continue;
197 }
198
199 } else { /* line == NULL: EOF */
200 next_link:
201 if (links) {
202 /* Output hardlink's data */
203 st = links->st;
204 name = links->names->name;
205 links->names = links->names->next;
206 /* GNU cpio is reported to emit file data
207 * only for the last instance. Mimic that. */
208 if (links->names == NULL)
209 links = links->next;
210 else
211 st.st_size = 0;
212 /* NB: we leak links->names and/or links,
213 * this is intended (we exit soon anyway) */
214 } else {
215 /* If no (more) hardlinks to output,
216 * output "trailer" entry */
217 name = trailer;
218 /* st.st_size == 0 is a must, but for uniformity
219 * in the output, we zero out everything */
220 memset(&st, 0, sizeof(st));
221 /* st.st_nlink = 1; - GNU cpio does this */
222 }
223 }
224
225 bytes += printf("070701"
226 "%08X%08X%08X%08X%08X%08X%08X"
227 "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
228 /* strlen+1: */ "%08X"
229 /* chksum: */ "00000000" /* (only for "070702" files) */
230 /* name,NUL: */ "%s%c",
231 (unsigned)(uint32_t) st.st_ino,
232 (unsigned)(uint32_t) st.st_mode,
233 (unsigned)(uint32_t) st.st_uid,
234 (unsigned)(uint32_t) st.st_gid,
235 (unsigned)(uint32_t) st.st_nlink,
236 (unsigned)(uint32_t) st.st_mtime,
237 (unsigned)(uint32_t) st.st_size,
238 (unsigned)(uint32_t) major(st.st_dev),
239 (unsigned)(uint32_t) minor(st.st_dev),
240 (unsigned)(uint32_t) major(st.st_rdev),
241 (unsigned)(uint32_t) minor(st.st_rdev),
242 (unsigned)(strlen(name) + 1),
243 name, '\0');
244 bytes = cpio_pad4(bytes);
245
246 if (st.st_size) {
247 if (S_ISLNK(st.st_mode)) {
248 char *lpath = xmalloc_readlink_or_warn(name);
249 if (!lpath)
250 goto abort_cpio_o;
251 bytes += printf("%s", lpath);
252 free(lpath);
253 } else { /* S_ISREG */
254 int fd = xopen(name, O_RDONLY);
255 fflush_all();
256 /* We must abort if file got shorter too! */
257 bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
258 bytes += st.st_size;
259 close(fd);
260 }
261 bytes = cpio_pad4(bytes);
262 }
263
264 if (!line) {
265 if (name != trailer)
266 goto next_link;
267 /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
268 return EXIT_SUCCESS;
269 }
270
271 free(line);
272 } /* end of "while (1)" */
273}
274#endif
275
276int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
277int cpio_main(int argc UNUSED_PARAM, char **argv)
278{
279 archive_handle_t *archive_handle;
280 char *cpio_filename;
281 IF_FEATURE_CPIO_O(const char *cpio_fmt = "";)
282 unsigned opt;
283
284#if ENABLE_LONG_OPTS
285 applet_long_options =
286 "extract\0" No_argument "i"
287 "list\0" No_argument "t"
288#if ENABLE_FEATURE_CPIO_O
289 "create\0" No_argument "o"
290 "format\0" Required_argument "H"
291#if ENABLE_FEATURE_CPIO_P
292 "pass-through\0" No_argument "p"
293#endif
294#endif
295 "verbose\0" No_argument "v"
296 "quiet\0" No_argument "\xff"
297 "to-stdout\0" No_argument "\xfe"
298 ;
299#endif
300
301 archive_handle = init_handle();
302 /* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */
303 archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
304
305 /* As of now we do not enforce this: */
306 /* -i,-t,-o,-p are mutually exclusive */
307 /* -u,-d,-m make sense only with -i or -p */
308 /* -L makes sense only with -o or -p */
309
310#if !ENABLE_FEATURE_CPIO_O
311 opt = getopt32(argv, OPTION_STR, &cpio_filename);
312 argv += optind;
313 if (opt & CPIO_OPT_FILE) { /* -F */
314 xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
315 }
316#else
317 opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt);
318 argv += optind;
319 if ((opt & (CPIO_OPT_FILE|CPIO_OPT_CREATE)) == CPIO_OPT_FILE) { /* -F without -o */
320 xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
321 }
322 if (opt & CPIO_OPT_PASSTHROUGH) {
323 pid_t pid;
324 struct fd_pair pp;
325
326 if (argv[0] == NULL)
327 bb_show_usage();
328 if (opt & CPIO_OPT_CREATE_LEADING_DIR)
329 mkdir(argv[0], 0777);
330 /* Crude existence check:
331 * close(xopen(argv[0], O_RDONLY | O_DIRECTORY));
332 * We can also xopen, fstat, IS_DIR, later fchdir.
333 * This would check for existence earlier and cleaner.
334 * As it stands now, if we fail xchdir later,
335 * child dies on EPIPE, unless it caught
336 * a diffrerent problem earlier.
337 * This is good enough for now.
338 */
339#if !BB_MMU
340 pp.rd = 3;
341 pp.wr = 4;
342 if (!re_execed) {
343 close(3);
344 close(4);
345 xpiped_pair(pp);
346 }
347#else
348 xpiped_pair(pp);
349#endif
350 pid = fork_or_rexec(argv - optind);
351 if (pid == 0) { /* child */
352 close(pp.rd);
353 xmove_fd(pp.wr, STDOUT_FILENO);
354 goto dump;
355 }
356 /* parent */
357 xchdir(*argv++);
358 close(pp.wr);
359 xmove_fd(pp.rd, STDIN_FILENO);
360 //opt &= ~CPIO_OPT_PASSTHROUGH;
361 opt |= CPIO_OPT_EXTRACT;
362 goto skip;
363 }
364 /* -o */
365 if (opt & CPIO_OPT_CREATE) {
366 if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */
367 bb_show_usage();
368 if (opt & CPIO_OPT_FILE) {
369 xmove_fd(xopen(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
370 }
371 dump:
372 return cpio_o();
373 }
374 skip:
375#endif
376
377 /* One of either extract or test options must be given */
378 if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) {
379 bb_show_usage();
380 }
381
382 if (opt & CPIO_OPT_TEST) {
383 /* if both extract and test options are given, ignore extract option */
384 opt &= ~CPIO_OPT_EXTRACT;
385 archive_handle->action_header = header_list;
386 }
387 if (opt & CPIO_OPT_EXTRACT) {
388 archive_handle->action_data = data_extract_all;
389 if (opt & CPIO_OPT_2STDOUT)
390 archive_handle->action_data = data_extract_to_stdout;
391 }
392 if (opt & CPIO_OPT_UNCONDITIONAL) {
393 archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD;
394 archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
395 }
396 if (opt & CPIO_OPT_VERBOSE) {
397 if (archive_handle->action_header == header_list) {
398 archive_handle->action_header = header_verbose_list;
399 } else {
400 archive_handle->action_header = header_list;
401 }
402 }
403 if (opt & CPIO_OPT_CREATE_LEADING_DIR) {
404 archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
405 }
406 if (opt & CPIO_OPT_PRESERVE_MTIME) {
407 archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
408 }
409
410 while (*argv) {
411 archive_handle->filter = filter_accept_list;
412 llist_add_to(&archive_handle->accept, *argv);
413 argv++;
414 }
415
416 /* see get_header_cpio */
417 archive_handle->cpio__blocks = (off_t)-1;
418 while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
419 continue;
420
421 if (archive_handle->cpio__blocks != (off_t)-1
422 && !(opt & CPIO_OPT_QUIET)
423 ) {
424 fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks);
425 }
426
427 return EXIT_SUCCESS;
428}
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