Contents of /trunk/mkinitrd-magellan/busybox/archival/cpio.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 13482 byte(s)
-updated to busybox-1.17.1
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 tarball for details. |
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 "unarchive.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 | */ |
81 | enum { |
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 |
107 | static 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. */ |
120 | static 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 | |
276 | int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
277 | int 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 | /* no parameters */ |
312 | opt_complementary = "=0"; |
313 | opt = getopt32(argv, OPTION_STR, &cpio_filename); |
314 | argv += optind; |
315 | if (opt & CPIO_OPT_FILE) { /* -F */ |
316 | xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO); |
317 | } |
318 | #else |
319 | /* _exactly_ one parameter for -p, thus <= 1 param if -p is allowed */ |
320 | opt_complementary = ENABLE_FEATURE_CPIO_P ? "?1" : "=0"; |
321 | opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt); |
322 | argv += optind; |
323 | if ((opt & (CPIO_OPT_FILE|CPIO_OPT_CREATE)) == CPIO_OPT_FILE) { /* -F without -o */ |
324 | xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO); |
325 | } |
326 | if (opt & CPIO_OPT_PASSTHROUGH) { |
327 | pid_t pid; |
328 | struct fd_pair pp; |
329 | |
330 | if (argv[0] == NULL) |
331 | bb_show_usage(); |
332 | if (opt & CPIO_OPT_CREATE_LEADING_DIR) |
333 | mkdir(argv[0], 0777); |
334 | /* Crude existence check: |
335 | * close(xopen(argv[0], O_RDONLY | O_DIRECTORY)); |
336 | * We can also xopen, fstat, IS_DIR, later fchdir. |
337 | * This would check for existence earlier and cleaner. |
338 | * As it stands now, if we fail xchdir later, |
339 | * child dies on EPIPE, unless it caught |
340 | * a diffrerent problem earlier. |
341 | * This is good enough for now. |
342 | */ |
343 | #if !BB_MMU |
344 | pp.rd = 3; |
345 | pp.wr = 4; |
346 | if (!re_execed) { |
347 | close(3); |
348 | close(4); |
349 | xpiped_pair(pp); |
350 | } |
351 | #else |
352 | xpiped_pair(pp); |
353 | #endif |
354 | pid = fork_or_rexec(argv - optind); |
355 | if (pid == 0) { /* child */ |
356 | close(pp.rd); |
357 | xmove_fd(pp.wr, STDOUT_FILENO); |
358 | goto dump; |
359 | } |
360 | /* parent */ |
361 | xchdir(*argv++); |
362 | close(pp.wr); |
363 | xmove_fd(pp.rd, STDIN_FILENO); |
364 | //opt &= ~CPIO_OPT_PASSTHROUGH; |
365 | opt |= CPIO_OPT_EXTRACT; |
366 | goto skip; |
367 | } |
368 | /* -o */ |
369 | if (opt & CPIO_OPT_CREATE) { |
370 | if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */ |
371 | bb_show_usage(); |
372 | if (opt & CPIO_OPT_FILE) { |
373 | xmove_fd(xopen3(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC, 0666), STDOUT_FILENO); |
374 | } |
375 | dump: |
376 | return cpio_o(); |
377 | } |
378 | skip: |
379 | #endif |
380 | |
381 | /* One of either extract or test options must be given */ |
382 | if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) { |
383 | bb_show_usage(); |
384 | } |
385 | |
386 | if (opt & CPIO_OPT_TEST) { |
387 | /* if both extract and test options are given, ignore extract option */ |
388 | opt &= ~CPIO_OPT_EXTRACT; |
389 | archive_handle->action_header = header_list; |
390 | } |
391 | if (opt & CPIO_OPT_EXTRACT) { |
392 | archive_handle->action_data = data_extract_all; |
393 | if (opt & CPIO_OPT_2STDOUT) |
394 | archive_handle->action_data = data_extract_to_stdout; |
395 | } |
396 | if (opt & CPIO_OPT_UNCONDITIONAL) { |
397 | archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD; |
398 | archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER; |
399 | } |
400 | if (opt & CPIO_OPT_VERBOSE) { |
401 | if (archive_handle->action_header == header_list) { |
402 | archive_handle->action_header = header_verbose_list; |
403 | } else { |
404 | archive_handle->action_header = header_list; |
405 | } |
406 | } |
407 | if (opt & CPIO_OPT_CREATE_LEADING_DIR) { |
408 | archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS; |
409 | } |
410 | if (opt & CPIO_OPT_PRESERVE_MTIME) { |
411 | archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE; |
412 | } |
413 | |
414 | while (*argv) { |
415 | archive_handle->filter = filter_accept_list; |
416 | llist_add_to(&archive_handle->accept, *argv); |
417 | argv++; |
418 | } |
419 | |
420 | /* see get_header_cpio */ |
421 | archive_handle->cpio__blocks = (off_t)-1; |
422 | while (get_header_cpio(archive_handle) == EXIT_SUCCESS) |
423 | continue; |
424 | |
425 | if (archive_handle->cpio__blocks != (off_t)-1 |
426 | && !(opt & CPIO_OPT_QUIET) |
427 | ) { |
428 | fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks); |
429 | } |
430 | |
431 | return EXIT_SUCCESS; |
432 | } |