Contents of /trunk/mkinitrd-magellan/busybox/archival/tar.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: 34472 byte(s)
-updated to busybox-1.17.1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini tar implementation for busybox |
4 | * |
5 | * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg |
6 | * by Glenn McGrath |
7 | * |
8 | * Note, that as of BusyBox-0.43, tar has been completely rewritten from the |
9 | * ground up. It still has remnants of the old code lying about, but it is |
10 | * very different now (i.e., cleaner, less global variables, etc.) |
11 | * |
12 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
13 | * |
14 | * Based in part in the tar implementation in sash |
15 | * Copyright (c) 1999 by David I. Bell |
16 | * Permission is granted to use, distribute, or modify this source, |
17 | * provided that this copyright notice remains intact. |
18 | * Permission to distribute sash derived code under the GPL has been granted. |
19 | * |
20 | * Based in part on the tar implementation from busybox-0.28 |
21 | * Copyright (C) 1995 Bruce Perens |
22 | * |
23 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
24 | */ |
25 | |
26 | #include <fnmatch.h> |
27 | #include "libbb.h" |
28 | #include "unarchive.h" |
29 | /* FIXME: Stop using this non-standard feature */ |
30 | #ifndef FNM_LEADING_DIR |
31 | # define FNM_LEADING_DIR 0 |
32 | #endif |
33 | |
34 | |
35 | //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__) |
36 | #define DBG(...) ((void)0) |
37 | |
38 | |
39 | #define block_buf bb_common_bufsiz1 |
40 | |
41 | |
42 | #if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2 |
43 | /* Do not pass gzip flag to writeTarFile() */ |
44 | #define writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude, gzip) \ |
45 | writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude) |
46 | #endif |
47 | |
48 | |
49 | #if ENABLE_FEATURE_TAR_CREATE |
50 | |
51 | /* |
52 | ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are |
53 | ** the only functions that deal with the HardLinkInfo structure. |
54 | ** Even these functions use the xxxHardLinkInfo() functions. |
55 | */ |
56 | typedef struct HardLinkInfo { |
57 | struct HardLinkInfo *next; /* Next entry in list */ |
58 | dev_t dev; /* Device number */ |
59 | ino_t ino; /* Inode number */ |
60 | // short linkCount; /* (Hard) Link Count */ |
61 | char name[1]; /* Start of filename (must be last) */ |
62 | } HardLinkInfo; |
63 | |
64 | /* Some info to be carried along when creating a new tarball */ |
65 | typedef struct TarBallInfo { |
66 | int tarFd; /* Open-for-write file descriptor |
67 | * for the tarball */ |
68 | int verboseFlag; /* Whether to print extra stuff or not */ |
69 | const llist_t *excludeList; /* List of files to not include */ |
70 | HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */ |
71 | HardLinkInfo *hlInfo; /* Hard Link Info for the current file */ |
72 | //TODO: save only st_dev + st_ino |
73 | struct stat tarFileStatBuf; /* Stat info for the tarball, letting |
74 | * us know the inode and device that the |
75 | * tarball lives, so we can avoid trying |
76 | * to include the tarball into itself */ |
77 | } TarBallInfo; |
78 | |
79 | /* A nice enum with all the possible tar file content types */ |
80 | enum { |
81 | REGTYPE = '0', /* regular file */ |
82 | REGTYPE0 = '\0', /* regular file (ancient bug compat) */ |
83 | LNKTYPE = '1', /* hard link */ |
84 | SYMTYPE = '2', /* symbolic link */ |
85 | CHRTYPE = '3', /* character special */ |
86 | BLKTYPE = '4', /* block special */ |
87 | DIRTYPE = '5', /* directory */ |
88 | FIFOTYPE = '6', /* FIFO special */ |
89 | CONTTYPE = '7', /* reserved */ |
90 | GNULONGLINK = 'K', /* GNU long (>100 chars) link name */ |
91 | GNULONGNAME = 'L', /* GNU long (>100 chars) file name */ |
92 | }; |
93 | |
94 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ |
95 | static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr, |
96 | struct stat *statbuf, |
97 | const char *fileName) |
98 | { |
99 | /* Note: hlInfoHeadPtr can never be NULL! */ |
100 | HardLinkInfo *hlInfo; |
101 | |
102 | hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName)); |
103 | hlInfo->next = *hlInfoHeadPtr; |
104 | *hlInfoHeadPtr = hlInfo; |
105 | hlInfo->dev = statbuf->st_dev; |
106 | hlInfo->ino = statbuf->st_ino; |
107 | // hlInfo->linkCount = statbuf->st_nlink; |
108 | strcpy(hlInfo->name, fileName); |
109 | } |
110 | |
111 | static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr) |
112 | { |
113 | HardLinkInfo *hlInfo; |
114 | HardLinkInfo *hlInfoNext; |
115 | |
116 | if (hlInfoHeadPtr) { |
117 | hlInfo = *hlInfoHeadPtr; |
118 | while (hlInfo) { |
119 | hlInfoNext = hlInfo->next; |
120 | free(hlInfo); |
121 | hlInfo = hlInfoNext; |
122 | } |
123 | *hlInfoHeadPtr = NULL; |
124 | } |
125 | } |
126 | |
127 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */ |
128 | static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf) |
129 | { |
130 | while (hlInfo) { |
131 | if (statbuf->st_ino == hlInfo->ino |
132 | && statbuf->st_dev == hlInfo->dev |
133 | ) { |
134 | DBG("found hardlink:'%s'", hlInfo->name); |
135 | break; |
136 | } |
137 | hlInfo = hlInfo->next; |
138 | } |
139 | return hlInfo; |
140 | } |
141 | |
142 | /* Put an octal string into the specified buffer. |
143 | * The number is zero padded and possibly null terminated. |
144 | * Stores low-order bits only if whole value does not fit. */ |
145 | static void putOctal(char *cp, int len, off_t value) |
146 | { |
147 | char tempBuffer[sizeof(off_t)*3 + 1]; |
148 | char *tempString = tempBuffer; |
149 | int width; |
150 | |
151 | width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value); |
152 | tempString += (width - len); |
153 | |
154 | /* If string has leading zeroes, we can drop one */ |
155 | /* and field will have trailing '\0' */ |
156 | /* (increases chances of compat with other tars) */ |
157 | if (tempString[0] == '0') |
158 | tempString++; |
159 | |
160 | /* Copy the string to the field */ |
161 | memcpy(cp, tempString, len); |
162 | } |
163 | #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b)) |
164 | |
165 | static void chksum_and_xwrite(int fd, struct tar_header_t* hp) |
166 | { |
167 | /* POSIX says that checksum is done on unsigned bytes |
168 | * (Sun and HP-UX gets it wrong... more details in |
169 | * GNU tar source) */ |
170 | const unsigned char *cp; |
171 | int chksum, size; |
172 | |
173 | strcpy(hp->magic, "ustar "); |
174 | |
175 | /* Calculate and store the checksum (i.e., the sum of all of the bytes of |
176 | * the header). The checksum field must be filled with blanks for the |
177 | * calculation. The checksum field is formatted differently from the |
178 | * other fields: it has 6 digits, a null, then a space -- rather than |
179 | * digits, followed by a null like the other fields... */ |
180 | memset(hp->chksum, ' ', sizeof(hp->chksum)); |
181 | cp = (const unsigned char *) hp; |
182 | chksum = 0; |
183 | size = sizeof(*hp); |
184 | do { chksum += *cp++; } while (--size); |
185 | putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum); |
186 | |
187 | /* Now write the header out to disk */ |
188 | xwrite(fd, hp, sizeof(*hp)); |
189 | } |
190 | |
191 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
192 | static void writeLongname(int fd, int type, const char *name, int dir) |
193 | { |
194 | static const struct { |
195 | char mode[8]; /* 100-107 */ |
196 | char uid[8]; /* 108-115 */ |
197 | char gid[8]; /* 116-123 */ |
198 | char size[12]; /* 124-135 */ |
199 | char mtime[12]; /* 136-147 */ |
200 | } prefilled = { |
201 | "0000000", |
202 | "0000000", |
203 | "0000000", |
204 | "00000000000", |
205 | "00000000000", |
206 | }; |
207 | struct tar_header_t header; |
208 | int size; |
209 | |
210 | dir = !!dir; /* normalize: 0/1 */ |
211 | size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */ |
212 | /* + dir: account for possible '/' */ |
213 | |
214 | memset(&header, 0, sizeof(header)); |
215 | strcpy(header.name, "././@LongLink"); |
216 | memcpy(header.mode, prefilled.mode, sizeof(prefilled)); |
217 | PUT_OCTAL(header.size, size); |
218 | header.typeflag = type; |
219 | chksum_and_xwrite(fd, &header); |
220 | |
221 | /* Write filename[/] and pad the block. */ |
222 | /* dir=0: writes 'name<NUL>', pads */ |
223 | /* dir=1: writes 'name', writes '/<NUL>', pads */ |
224 | dir *= 2; |
225 | xwrite(fd, name, size - dir); |
226 | xwrite(fd, "/", dir); |
227 | size = (-size) & (TAR_BLOCK_SIZE-1); |
228 | memset(&header, 0, size); |
229 | xwrite(fd, &header, size); |
230 | } |
231 | #endif |
232 | |
233 | /* Write out a tar header for the specified file/directory/whatever */ |
234 | static int writeTarHeader(struct TarBallInfo *tbInfo, |
235 | const char *header_name, const char *fileName, struct stat *statbuf) |
236 | { |
237 | struct tar_header_t header; |
238 | |
239 | memset(&header, 0, sizeof(header)); |
240 | |
241 | strncpy(header.name, header_name, sizeof(header.name)); |
242 | |
243 | /* POSIX says to mask mode with 07777. */ |
244 | PUT_OCTAL(header.mode, statbuf->st_mode & 07777); |
245 | PUT_OCTAL(header.uid, statbuf->st_uid); |
246 | PUT_OCTAL(header.gid, statbuf->st_gid); |
247 | memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */ |
248 | PUT_OCTAL(header.mtime, statbuf->st_mtime); |
249 | |
250 | /* Enter the user and group names */ |
251 | safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname)); |
252 | safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname)); |
253 | |
254 | if (tbInfo->hlInfo) { |
255 | /* This is a hard link */ |
256 | header.typeflag = LNKTYPE; |
257 | strncpy(header.linkname, tbInfo->hlInfo->name, |
258 | sizeof(header.linkname)); |
259 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
260 | /* Write out long linkname if needed */ |
261 | if (header.linkname[sizeof(header.linkname)-1]) |
262 | writeLongname(tbInfo->tarFd, GNULONGLINK, |
263 | tbInfo->hlInfo->name, 0); |
264 | #endif |
265 | } else if (S_ISLNK(statbuf->st_mode)) { |
266 | char *lpath = xmalloc_readlink_or_warn(fileName); |
267 | if (!lpath) |
268 | return FALSE; |
269 | header.typeflag = SYMTYPE; |
270 | strncpy(header.linkname, lpath, sizeof(header.linkname)); |
271 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
272 | /* Write out long linkname if needed */ |
273 | if (header.linkname[sizeof(header.linkname)-1]) |
274 | writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0); |
275 | #else |
276 | /* If it is larger than 100 bytes, bail out */ |
277 | if (header.linkname[sizeof(header.linkname)-1]) { |
278 | free(lpath); |
279 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
280 | return FALSE; |
281 | } |
282 | #endif |
283 | free(lpath); |
284 | } else if (S_ISDIR(statbuf->st_mode)) { |
285 | header.typeflag = DIRTYPE; |
286 | /* Append '/' only if there is a space for it */ |
287 | if (!header.name[sizeof(header.name)-1]) |
288 | header.name[strlen(header.name)] = '/'; |
289 | } else if (S_ISCHR(statbuf->st_mode)) { |
290 | header.typeflag = CHRTYPE; |
291 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
292 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
293 | } else if (S_ISBLK(statbuf->st_mode)) { |
294 | header.typeflag = BLKTYPE; |
295 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
296 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
297 | } else if (S_ISFIFO(statbuf->st_mode)) { |
298 | header.typeflag = FIFOTYPE; |
299 | } else if (S_ISREG(statbuf->st_mode)) { |
300 | if (sizeof(statbuf->st_size) > 4 |
301 | && statbuf->st_size > (off_t)0777777777777LL |
302 | ) { |
303 | bb_error_msg_and_die("can't store file '%s' " |
304 | "of size %"OFF_FMT"u, aborting", |
305 | fileName, statbuf->st_size); |
306 | } |
307 | header.typeflag = REGTYPE; |
308 | PUT_OCTAL(header.size, statbuf->st_size); |
309 | } else { |
310 | bb_error_msg("%s: unknown file type", fileName); |
311 | return FALSE; |
312 | } |
313 | |
314 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
315 | /* Write out long name if needed */ |
316 | /* (we, like GNU tar, output long linkname *before* long name) */ |
317 | if (header.name[sizeof(header.name)-1]) |
318 | writeLongname(tbInfo->tarFd, GNULONGNAME, |
319 | header_name, S_ISDIR(statbuf->st_mode)); |
320 | #endif |
321 | |
322 | /* Now write the header out to disk */ |
323 | chksum_and_xwrite(tbInfo->tarFd, &header); |
324 | |
325 | /* Now do the verbose thing (or not) */ |
326 | if (tbInfo->verboseFlag) { |
327 | FILE *vbFd = stdout; |
328 | |
329 | /* If archive goes to stdout, verbose goes to stderr */ |
330 | if (tbInfo->tarFd == STDOUT_FILENO) |
331 | vbFd = stderr; |
332 | /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */ |
333 | /* We don't have such excesses here: for us "v" == "vv" */ |
334 | /* '/' is probably a GNUism */ |
335 | fprintf(vbFd, "%s%s\n", header_name, |
336 | S_ISDIR(statbuf->st_mode) ? "/" : ""); |
337 | } |
338 | |
339 | return TRUE; |
340 | } |
341 | |
342 | #if ENABLE_FEATURE_TAR_FROM |
343 | static int exclude_file(const llist_t *excluded_files, const char *file) |
344 | { |
345 | while (excluded_files) { |
346 | if (excluded_files->data[0] == '/') { |
347 | if (fnmatch(excluded_files->data, file, |
348 | FNM_PATHNAME | FNM_LEADING_DIR) == 0) |
349 | return 1; |
350 | } else { |
351 | const char *p; |
352 | |
353 | for (p = file; p[0] != '\0'; p++) { |
354 | if ((p == file || p[-1] == '/') |
355 | && p[0] != '/' |
356 | && fnmatch(excluded_files->data, p, |
357 | FNM_PATHNAME | FNM_LEADING_DIR) == 0 |
358 | ) { |
359 | return 1; |
360 | } |
361 | } |
362 | } |
363 | excluded_files = excluded_files->link; |
364 | } |
365 | |
366 | return 0; |
367 | } |
368 | #else |
369 | # define exclude_file(excluded_files, file) 0 |
370 | #endif |
371 | |
372 | static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf, |
373 | void *userData, int depth UNUSED_PARAM) |
374 | { |
375 | struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; |
376 | const char *header_name; |
377 | int inputFileFd = -1; |
378 | |
379 | DBG("writeFileToTarball('%s')", fileName); |
380 | |
381 | /* Strip leading '/' (must be before memorizing hardlink's name) */ |
382 | header_name = fileName; |
383 | while (header_name[0] == '/') { |
384 | static smallint warned; |
385 | |
386 | if (!warned) { |
387 | bb_error_msg("removing leading '/' from member names"); |
388 | warned = 1; |
389 | } |
390 | header_name++; |
391 | } |
392 | |
393 | if (header_name[0] == '\0') |
394 | return TRUE; |
395 | |
396 | /* It is against the rules to archive a socket */ |
397 | if (S_ISSOCK(statbuf->st_mode)) { |
398 | bb_error_msg("%s: socket ignored", fileName); |
399 | return TRUE; |
400 | } |
401 | |
402 | /* |
403 | * Check to see if we are dealing with a hard link. |
404 | * If so - |
405 | * Treat the first occurance of a given dev/inode as a file while |
406 | * treating any additional occurances as hard links. This is done |
407 | * by adding the file information to the HardLinkInfo linked list. |
408 | */ |
409 | tbInfo->hlInfo = NULL; |
410 | if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) { |
411 | DBG("'%s': st_nlink > 1", header_name); |
412 | tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf); |
413 | if (tbInfo->hlInfo == NULL) { |
414 | DBG("'%s': addHardLinkInfo", header_name); |
415 | addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name); |
416 | } |
417 | } |
418 | |
419 | /* It is a bad idea to store the archive we are in the process of creating, |
420 | * so check the device and inode to be sure that this particular file isn't |
421 | * the new tarball */ |
422 | if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev |
423 | && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino |
424 | ) { |
425 | bb_error_msg("%s: file is the archive; skipping", fileName); |
426 | return TRUE; |
427 | } |
428 | |
429 | if (exclude_file(tbInfo->excludeList, header_name)) |
430 | return SKIP; |
431 | |
432 | #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
433 | if (strlen(header_name) >= NAME_SIZE) { |
434 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
435 | return TRUE; |
436 | } |
437 | #endif |
438 | |
439 | /* Is this a regular file? */ |
440 | if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) { |
441 | /* open the file we want to archive, and make sure all is well */ |
442 | inputFileFd = open_or_warn(fileName, O_RDONLY); |
443 | if (inputFileFd < 0) { |
444 | return FALSE; |
445 | } |
446 | } |
447 | |
448 | /* Add an entry to the tarball */ |
449 | if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) { |
450 | return FALSE; |
451 | } |
452 | |
453 | /* If it was a regular file, write out the body */ |
454 | if (inputFileFd >= 0) { |
455 | size_t readSize; |
456 | /* Write the file to the archive. */ |
457 | /* We record size into header first, */ |
458 | /* and then write out file. If file shrinks in between, */ |
459 | /* tar will be corrupted. So we don't allow for that. */ |
460 | /* NB: GNU tar 1.16 warns and pads with zeroes */ |
461 | /* or even seeks back and updates header */ |
462 | bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
463 | ////off_t readSize; |
464 | ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
465 | ////if (readSize != statbuf->st_size && readSize >= 0) { |
466 | //// bb_error_msg_and_die("short read from %s, aborting", fileName); |
467 | ////} |
468 | |
469 | /* Check that file did not grow in between? */ |
470 | /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */ |
471 | |
472 | close(inputFileFd); |
473 | |
474 | /* Pad the file up to the tar block size */ |
475 | /* (a few tricks here in the name of code size) */ |
476 | readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1); |
477 | memset(block_buf, 0, readSize); |
478 | xwrite(tbInfo->tarFd, block_buf, readSize); |
479 | } |
480 | |
481 | return TRUE; |
482 | } |
483 | |
484 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
485 | # if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2) |
486 | # define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd) |
487 | # endif |
488 | /* Don't inline: vfork scares gcc and pessimizes code */ |
489 | static void NOINLINE vfork_compressor(int tar_fd, int gzip) |
490 | { |
491 | pid_t gzipPid; |
492 | # if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2 |
493 | const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; |
494 | # elif ENABLE_FEATURE_SEAMLESS_GZ |
495 | const char *zip_exec = "gzip"; |
496 | # else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */ |
497 | const char *zip_exec = "bzip2"; |
498 | # endif |
499 | // On Linux, vfork never unpauses parent early, although standard |
500 | // allows for that. Do we want to waste bytes checking for it? |
501 | # define WAIT_FOR_CHILD 0 |
502 | volatile int vfork_exec_errno = 0; |
503 | struct fd_pair gzipDataPipe; |
504 | # if WAIT_FOR_CHILD |
505 | struct fd_pair gzipStatusPipe; |
506 | xpiped_pair(gzipStatusPipe); |
507 | # endif |
508 | xpiped_pair(gzipDataPipe); |
509 | |
510 | signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ |
511 | |
512 | # if defined(__GNUC__) && __GNUC__ |
513 | /* Avoid vfork clobbering */ |
514 | (void) &zip_exec; |
515 | # endif |
516 | |
517 | gzipPid = xvfork(); |
518 | |
519 | if (gzipPid == 0) { |
520 | /* child */ |
521 | /* NB: close _first_, then move fds! */ |
522 | close(gzipDataPipe.wr); |
523 | # if WAIT_FOR_CHILD |
524 | close(gzipStatusPipe.rd); |
525 | /* gzipStatusPipe.wr will close only on exec - |
526 | * parent waits for this close to happen */ |
527 | fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC); |
528 | # endif |
529 | xmove_fd(gzipDataPipe.rd, 0); |
530 | xmove_fd(tar_fd, 1); |
531 | /* exec gzip/bzip2 program/applet */ |
532 | BB_EXECLP(zip_exec, zip_exec, "-f", NULL); |
533 | vfork_exec_errno = errno; |
534 | _exit(EXIT_FAILURE); |
535 | } |
536 | |
537 | /* parent */ |
538 | xmove_fd(gzipDataPipe.wr, tar_fd); |
539 | close(gzipDataPipe.rd); |
540 | # if WAIT_FOR_CHILD |
541 | close(gzipStatusPipe.wr); |
542 | while (1) { |
543 | char buf; |
544 | int n; |
545 | |
546 | /* Wait until child execs (or fails to) */ |
547 | n = full_read(gzipStatusPipe.rd, &buf, 1); |
548 | if (n < 0 /* && errno == EAGAIN */) |
549 | continue; /* try it again */ |
550 | } |
551 | close(gzipStatusPipe.rd); |
552 | # endif |
553 | if (vfork_exec_errno) { |
554 | errno = vfork_exec_errno; |
555 | bb_perror_msg_and_die("can't execute '%s'", zip_exec); |
556 | } |
557 | } |
558 | #endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */ |
559 | |
560 | |
561 | /* gcc 4.2.1 inlines it, making code bigger */ |
562 | static NOINLINE int writeTarFile(int tar_fd, int verboseFlag, |
563 | int dereferenceFlag, const llist_t *include, |
564 | const llist_t *exclude, int gzip) |
565 | { |
566 | int errorFlag = FALSE; |
567 | struct TarBallInfo tbInfo; |
568 | |
569 | tbInfo.hlInfoHead = NULL; |
570 | tbInfo.tarFd = tar_fd; |
571 | tbInfo.verboseFlag = verboseFlag; |
572 | |
573 | /* Store the stat info for the tarball's file, so |
574 | * can avoid including the tarball into itself.... */ |
575 | if (fstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf) < 0) |
576 | bb_perror_msg_and_die("can't stat tar file"); |
577 | |
578 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
579 | if (gzip) |
580 | vfork_compressor(tbInfo.tarFd, gzip); |
581 | #endif |
582 | |
583 | tbInfo.excludeList = exclude; |
584 | |
585 | /* Read the directory/files and iterate over them one at a time */ |
586 | while (include) { |
587 | if (!recursive_action(include->data, ACTION_RECURSE | |
588 | (dereferenceFlag ? ACTION_FOLLOWLINKS : 0), |
589 | writeFileToTarball, writeFileToTarball, &tbInfo, 0) |
590 | ) { |
591 | errorFlag = TRUE; |
592 | } |
593 | include = include->link; |
594 | } |
595 | /* Write two empty blocks to the end of the archive */ |
596 | memset(block_buf, 0, 2*TAR_BLOCK_SIZE); |
597 | xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE); |
598 | |
599 | /* To be pedantically correct, we would check if the tarball |
600 | * is smaller than 20 tar blocks, and pad it if it was smaller, |
601 | * but that isn't necessary for GNU tar interoperability, and |
602 | * so is considered a waste of space */ |
603 | |
604 | /* Close so the child process (if any) will exit */ |
605 | close(tbInfo.tarFd); |
606 | |
607 | /* Hang up the tools, close up shop, head home */ |
608 | if (ENABLE_FEATURE_CLEAN_UP) |
609 | freeHardLinkInfo(&tbInfo.hlInfoHead); |
610 | |
611 | if (errorFlag) |
612 | bb_error_msg("error exit delayed from previous errors"); |
613 | |
614 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
615 | if (gzip) { |
616 | int status; |
617 | if (safe_waitpid(-1, &status, 0) == -1) |
618 | bb_perror_msg("waitpid"); |
619 | else if (!WIFEXITED(status) || WEXITSTATUS(status)) |
620 | /* gzip was killed or has exited with nonzero! */ |
621 | errorFlag = TRUE; |
622 | } |
623 | #endif |
624 | return errorFlag; |
625 | } |
626 | #else |
627 | int writeTarFile(int tar_fd, int verboseFlag, |
628 | int dereferenceFlag, const llist_t *include, |
629 | const llist_t *exclude, int gzip); |
630 | #endif /* FEATURE_TAR_CREATE */ |
631 | |
632 | #if ENABLE_FEATURE_TAR_FROM |
633 | static llist_t *append_file_list_to_list(llist_t *list) |
634 | { |
635 | FILE *src_stream; |
636 | char *line; |
637 | llist_t *newlist = NULL; |
638 | |
639 | while (list) { |
640 | src_stream = xfopen_for_read(llist_pop(&list)); |
641 | while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
642 | /* kill trailing '/' unless the string is just "/" */ |
643 | char *cp = last_char_is(line, '/'); |
644 | if (cp > line) |
645 | *cp = '\0'; |
646 | llist_add_to(&newlist, line); |
647 | } |
648 | fclose(src_stream); |
649 | } |
650 | return newlist; |
651 | } |
652 | #else |
653 | # define append_file_list_to_list(x) 0 |
654 | #endif |
655 | |
656 | #if ENABLE_FEATURE_SEAMLESS_Z |
657 | static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle) |
658 | { |
659 | /* Can't lseek over pipes */ |
660 | archive_handle->seek = seek_by_read; |
661 | |
662 | /* do the decompression, and cleanup */ |
663 | if (xread_char(archive_handle->src_fd) != 0x1f |
664 | || xread_char(archive_handle->src_fd) != 0x9d |
665 | ) { |
666 | bb_error_msg_and_die("invalid magic"); |
667 | } |
668 | |
669 | open_transformer(archive_handle->src_fd, unpack_Z_stream, "uncompress"); |
670 | archive_handle->offset = 0; |
671 | while (get_header_tar(archive_handle) == EXIT_SUCCESS) |
672 | continue; |
673 | |
674 | /* Can only do one file at a time */ |
675 | return EXIT_FAILURE; |
676 | } |
677 | #else |
678 | # define get_header_tar_Z NULL |
679 | #endif |
680 | |
681 | #ifdef CHECK_FOR_CHILD_EXITCODE |
682 | /* Looks like it isn't needed - tar detects malformed (truncated) |
683 | * archive if e.g. bunzip2 fails */ |
684 | static int child_error; |
685 | |
686 | static void handle_SIGCHLD(int status) |
687 | { |
688 | /* Actually, 'status' is a signo. We reuse it for other needs */ |
689 | |
690 | /* Wait for any child without blocking */ |
691 | if (wait_any_nohang(&status) < 0) |
692 | /* wait failed?! I'm confused... */ |
693 | return; |
694 | |
695 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) |
696 | /* child exited with 0 */ |
697 | return; |
698 | /* Cannot happen? |
699 | if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */ |
700 | child_error = 1; |
701 | } |
702 | #endif |
703 | |
704 | //usage:#define tar_trivial_usage |
705 | //usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt" IF_FEATURE_SEAMLESS_GZ("z") |
706 | //usage: IF_FEATURE_SEAMLESS_BZ2("j") IF_FEATURE_SEAMLESS_LZMA("a") |
707 | //usage: IF_FEATURE_SEAMLESS_Z("Z") IF_FEATURE_TAR_NOPRESERVE_TIME("m") "vO] " |
708 | //usage: IF_FEATURE_TAR_FROM("[-X FILE] ") |
709 | //usage: "[-f TARFILE] [-C DIR] [FILE]..." |
710 | //usage:#define tar_full_usage "\n\n" |
711 | //usage: IF_FEATURE_TAR_CREATE("Create, extract, ") |
712 | //usage: IF_NOT_FEATURE_TAR_CREATE("Extract ") |
713 | //usage: "or list files from a tar file\n" |
714 | //usage: "\nOperation:" |
715 | //usage: IF_FEATURE_TAR_CREATE( |
716 | //usage: "\n c Create" |
717 | //usage: ) |
718 | //usage: "\n x Extract" |
719 | //usage: "\n t List" |
720 | //usage: "\nOptions:" |
721 | //usage: "\n f Name of TARFILE ('-' for stdin/out)" |
722 | //usage: "\n C Change to DIR before operation" |
723 | //usage: "\n v Verbose" |
724 | //usage: IF_FEATURE_SEAMLESS_GZ( |
725 | //usage: "\n z (De)compress using gzip" |
726 | //usage: ) |
727 | //usage: IF_FEATURE_SEAMLESS_BZ2( |
728 | //usage: "\n j (De)compress using bzip2" |
729 | //usage: ) |
730 | //usage: IF_FEATURE_SEAMLESS_LZMA( |
731 | //usage: "\n a (De)compress using lzma" |
732 | //usage: ) |
733 | //usage: IF_FEATURE_SEAMLESS_Z( |
734 | //usage: "\n Z (De)compress using compress" |
735 | //usage: ) |
736 | //usage: "\n O Extract to stdout" |
737 | //usage: IF_FEATURE_TAR_CREATE( |
738 | //usage: "\n h Follow symlinks" |
739 | //usage: ) |
740 | //usage: IF_FEATURE_TAR_NOPRESERVE_TIME( |
741 | //usage: "\n m Don't restore mtime" |
742 | //usage: ) |
743 | //usage: IF_FEATURE_TAR_FROM( |
744 | //usage: IF_FEATURE_TAR_LONG_OPTIONS( |
745 | //usage: "\n exclude File to exclude" |
746 | //usage: ) |
747 | //usage: "\n X File with names to exclude" |
748 | //usage: "\n T File with names to include" |
749 | //usage: ) |
750 | //usage: |
751 | //usage:#define tar_example_usage |
752 | //usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n" |
753 | //usage: "$ tar -cf /tmp/tarball.tar /usr/local\n" |
754 | |
755 | // Supported but aren't in --help: |
756 | // o no-same-owner |
757 | // p same-permissions |
758 | // k keep-old |
759 | // numeric-owner |
760 | // no-same-permissions |
761 | // overwrite |
762 | //IF_FEATURE_TAR_TO_COMMAND( |
763 | // to-command |
764 | //) |
765 | |
766 | enum { |
767 | OPTBIT_KEEP_OLD = 8, |
768 | IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,) |
769 | IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,) |
770 | IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,) |
771 | IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,) |
772 | IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,) |
773 | IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,) |
774 | IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,) |
775 | IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,) // 16th bit |
776 | IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,) |
777 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
778 | IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,) |
779 | OPTBIT_NUMERIC_OWNER, |
780 | OPTBIT_NOPRESERVE_PERM, |
781 | OPTBIT_OVERWRITE, |
782 | #endif |
783 | OPT_TEST = 1 << 0, // t |
784 | OPT_EXTRACT = 1 << 1, // x |
785 | OPT_BASEDIR = 1 << 2, // C |
786 | OPT_TARNAME = 1 << 3, // f |
787 | OPT_2STDOUT = 1 << 4, // O |
788 | OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner |
789 | OPT_P = 1 << 6, // p |
790 | OPT_VERBOSE = 1 << 7, // v |
791 | OPT_KEEP_OLD = 1 << 8, // k |
792 | OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c |
793 | OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h |
794 | OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j |
795 | OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a |
796 | OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T |
797 | OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X |
798 | OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z |
799 | OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z |
800 | OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m |
801 | OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command |
802 | OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner |
803 | OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions |
804 | OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite |
805 | }; |
806 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
807 | static const char tar_longopts[] ALIGN1 = |
808 | "list\0" No_argument "t" |
809 | "extract\0" No_argument "x" |
810 | "directory\0" Required_argument "C" |
811 | "file\0" Required_argument "f" |
812 | "to-stdout\0" No_argument "O" |
813 | /* do not restore owner */ |
814 | /* Note: GNU tar handles 'o' as no-same-owner only on extract, |
815 | * on create, 'o' is --old-archive. We do not support --old-archive. */ |
816 | "no-same-owner\0" No_argument "o" |
817 | "same-permissions\0" No_argument "p" |
818 | "verbose\0" No_argument "v" |
819 | "keep-old\0" No_argument "k" |
820 | # if ENABLE_FEATURE_TAR_CREATE |
821 | "create\0" No_argument "c" |
822 | "dereference\0" No_argument "h" |
823 | # endif |
824 | # if ENABLE_FEATURE_SEAMLESS_BZ2 |
825 | "bzip2\0" No_argument "j" |
826 | # endif |
827 | # if ENABLE_FEATURE_SEAMLESS_LZMA |
828 | "lzma\0" No_argument "a" |
829 | # endif |
830 | # if ENABLE_FEATURE_TAR_FROM |
831 | "files-from\0" Required_argument "T" |
832 | "exclude-from\0" Required_argument "X" |
833 | # endif |
834 | # if ENABLE_FEATURE_SEAMLESS_GZ |
835 | "gzip\0" No_argument "z" |
836 | # endif |
837 | # if ENABLE_FEATURE_SEAMLESS_Z |
838 | "compress\0" No_argument "Z" |
839 | # endif |
840 | # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME |
841 | "touch\0" No_argument "m" |
842 | # endif |
843 | # if ENABLE_FEATURE_TAR_TO_COMMAND |
844 | "to-command\0" Required_argument "\xfb" |
845 | # endif |
846 | /* use numeric uid/gid from tar header, not textual */ |
847 | "numeric-owner\0" No_argument "\xfc" |
848 | /* do not restore mode */ |
849 | "no-same-permissions\0" No_argument "\xfd" |
850 | /* on unpack, open with O_TRUNC and !O_EXCL */ |
851 | "overwrite\0" No_argument "\xfe" |
852 | /* --exclude takes next bit position in option mask, */ |
853 | /* therefore we have to put it _after_ --no-same-permissions */ |
854 | # if ENABLE_FEATURE_TAR_FROM |
855 | "exclude\0" Required_argument "\xff" |
856 | # endif |
857 | ; |
858 | #endif |
859 | |
860 | int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
861 | int tar_main(int argc UNUSED_PARAM, char **argv) |
862 | { |
863 | char FAST_FUNC (*get_header_ptr)(archive_handle_t *) = get_header_tar; |
864 | archive_handle_t *tar_handle; |
865 | char *base_dir = NULL; |
866 | const char *tar_filename = "-"; |
867 | unsigned opt; |
868 | int verboseFlag = 0; |
869 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
870 | llist_t *excludes = NULL; |
871 | #endif |
872 | |
873 | /* Initialise default values */ |
874 | tar_handle = init_handle(); |
875 | tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS |
876 | | ARCHIVE_RESTORE_DATE |
877 | | ARCHIVE_UNLINK_OLD; |
878 | |
879 | /* Apparently only root's tar preserves perms (see bug 3844) */ |
880 | if (getuid() != 0) |
881 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
882 | |
883 | /* Prepend '-' to the first argument if required */ |
884 | opt_complementary = "--:" // first arg is options |
885 | "tt:vv:" // count -t,-v |
886 | "?:" // bail out with usage instead of error return |
887 | "X::T::" // cumulative lists |
888 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
889 | "\xff::" // cumulative lists for --exclude |
890 | #endif |
891 | IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd |
892 | IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive |
893 | IF_NOT_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive |
894 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
895 | applet_long_options = tar_longopts; |
896 | #endif |
897 | #if ENABLE_DESKTOP |
898 | if (argv[1] && argv[1][0] != '-') { |
899 | /* Compat: |
900 | * 1st argument without dash handles options with parameters |
901 | * differently from dashed one: it takes *next argv[i]* |
902 | * as paramenter even if there are more chars in 1st argument: |
903 | * "tar fx TARFILE" - "x" is not taken as f's param |
904 | * but is interpreted as -x option |
905 | * "tar -xf TARFILE" - dashed equivalent of the above |
906 | * "tar -fx ..." - "x" is taken as f's param |
907 | * getopt32 wouldn't handle 1st command correctly. |
908 | * Unfortunately, people do use such commands. |
909 | * We massage argv[1] to work around it by moving 'f' |
910 | * to the end of the string. |
911 | * More contrived "tar fCx TARFILE DIR" still fails, |
912 | * but such commands are much less likely to be used. |
913 | */ |
914 | char *f = strchr(argv[1], 'f'); |
915 | if (f) { |
916 | while (f[1] != '\0') { |
917 | *f = f[1]; |
918 | f++; |
919 | } |
920 | *f = 'f'; |
921 | } |
922 | } |
923 | #endif |
924 | opt = getopt32(argv, |
925 | "txC:f:Oopvk" |
926 | IF_FEATURE_TAR_CREATE( "ch" ) |
927 | IF_FEATURE_SEAMLESS_BZ2( "j" ) |
928 | IF_FEATURE_SEAMLESS_LZMA("a" ) |
929 | IF_FEATURE_TAR_FROM( "T:X:") |
930 | IF_FEATURE_SEAMLESS_GZ( "z" ) |
931 | IF_FEATURE_SEAMLESS_Z( "Z" ) |
932 | IF_FEATURE_TAR_NOPRESERVE_TIME("m") |
933 | , &base_dir // -C dir |
934 | , &tar_filename // -f filename |
935 | IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T |
936 | IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X |
937 | IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command |
938 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
939 | , &excludes // --exclude |
940 | #endif |
941 | , &verboseFlag // combined count for -t and -v |
942 | , &verboseFlag // combined count for -t and -v |
943 | ); |
944 | //bb_error_msg("opt:%08x", opt); |
945 | argv += optind; |
946 | |
947 | if (verboseFlag) tar_handle->action_header = header_verbose_list; |
948 | if (verboseFlag == 1) tar_handle->action_header = header_list; |
949 | |
950 | if (opt & OPT_EXTRACT) |
951 | tar_handle->action_data = data_extract_all; |
952 | |
953 | if (opt & OPT_2STDOUT) |
954 | tar_handle->action_data = data_extract_to_stdout; |
955 | |
956 | if (opt & OPT_2COMMAND) { |
957 | putenv((char*)"TAR_FILETYPE=f"); |
958 | signal(SIGPIPE, SIG_IGN); |
959 | tar_handle->action_data = data_extract_to_command; |
960 | } |
961 | |
962 | if (opt & OPT_KEEP_OLD) |
963 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; |
964 | |
965 | if (opt & OPT_NUMERIC_OWNER) |
966 | tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER; |
967 | |
968 | if (opt & OPT_NOPRESERVE_OWNER) |
969 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER; |
970 | |
971 | if (opt & OPT_NOPRESERVE_PERM) |
972 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
973 | |
974 | if (opt & OPT_OVERWRITE) { |
975 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; |
976 | tar_handle->ah_flags |= ARCHIVE_O_TRUNC; |
977 | } |
978 | |
979 | if (opt & OPT_GZIP) |
980 | get_header_ptr = get_header_tar_gz; |
981 | |
982 | if (opt & OPT_BZIP2) |
983 | get_header_ptr = get_header_tar_bz2; |
984 | |
985 | if (opt & OPT_LZMA) |
986 | get_header_ptr = get_header_tar_lzma; |
987 | |
988 | if (opt & OPT_COMPRESS) |
989 | get_header_ptr = get_header_tar_Z; |
990 | |
991 | if (opt & OPT_NOPRESERVE_TIME) |
992 | tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE; |
993 | |
994 | #if ENABLE_FEATURE_TAR_FROM |
995 | tar_handle->reject = append_file_list_to_list(tar_handle->reject); |
996 | # if ENABLE_FEATURE_TAR_LONG_OPTIONS |
997 | /* Append excludes to reject */ |
998 | while (excludes) { |
999 | llist_t *next = excludes->link; |
1000 | excludes->link = tar_handle->reject; |
1001 | tar_handle->reject = excludes; |
1002 | excludes = next; |
1003 | } |
1004 | # endif |
1005 | tar_handle->accept = append_file_list_to_list(tar_handle->accept); |
1006 | #endif |
1007 | |
1008 | /* Setup an array of filenames to work with */ |
1009 | /* TODO: This is the same as in ar, make a separate function? */ |
1010 | while (*argv) { |
1011 | /* kill trailing '/' unless the string is just "/" */ |
1012 | char *cp = last_char_is(*argv, '/'); |
1013 | if (cp > *argv) |
1014 | *cp = '\0'; |
1015 | llist_add_to_end(&tar_handle->accept, *argv); |
1016 | argv++; |
1017 | } |
1018 | |
1019 | if (tar_handle->accept || tar_handle->reject) |
1020 | tar_handle->filter = filter_accept_reject_list; |
1021 | |
1022 | /* Open the tar file */ |
1023 | { |
1024 | int tar_fd = STDIN_FILENO; |
1025 | int flags = O_RDONLY; |
1026 | |
1027 | if (opt & OPT_CREATE) { |
1028 | /* Make sure there is at least one file to tar up */ |
1029 | if (tar_handle->accept == NULL) |
1030 | bb_error_msg_and_die("empty archive"); |
1031 | |
1032 | tar_fd = STDOUT_FILENO; |
1033 | /* Mimicking GNU tar 1.15.1: */ |
1034 | flags = O_WRONLY | O_CREAT | O_TRUNC; |
1035 | } |
1036 | |
1037 | if (LONE_DASH(tar_filename)) { |
1038 | tar_handle->src_fd = tar_fd; |
1039 | tar_handle->seek = seek_by_read; |
1040 | } else { |
1041 | if (ENABLE_FEATURE_TAR_AUTODETECT && flags == O_RDONLY) { |
1042 | get_header_ptr = get_header_tar; |
1043 | tar_handle->src_fd = open_zipped(tar_filename); |
1044 | if (tar_handle->src_fd < 0) |
1045 | bb_perror_msg_and_die("can't open '%s'", tar_filename); |
1046 | } else { |
1047 | tar_handle->src_fd = xopen(tar_filename, flags); |
1048 | } |
1049 | } |
1050 | } |
1051 | |
1052 | if (base_dir) |
1053 | xchdir(base_dir); |
1054 | |
1055 | #ifdef CHECK_FOR_CHILD_EXITCODE |
1056 | /* We need to know whether child (gzip/bzip/etc) exits abnormally */ |
1057 | signal(SIGCHLD, handle_SIGCHLD); |
1058 | #endif |
1059 | |
1060 | /* Create an archive */ |
1061 | if (opt & OPT_CREATE) { |
1062 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
1063 | int zipMode = 0; |
1064 | if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP)) |
1065 | zipMode = 1; |
1066 | if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2)) |
1067 | zipMode = 2; |
1068 | #endif |
1069 | /* NB: writeTarFile() closes tar_handle->src_fd */ |
1070 | return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE, |
1071 | tar_handle->accept, |
1072 | tar_handle->reject, zipMode); |
1073 | } |
1074 | |
1075 | while (get_header_ptr(tar_handle) == EXIT_SUCCESS) |
1076 | continue; |
1077 | |
1078 | /* Check that every file that should have been extracted was */ |
1079 | while (tar_handle->accept) { |
1080 | if (!find_list_entry(tar_handle->reject, tar_handle->accept->data) |
1081 | && !find_list_entry(tar_handle->passed, tar_handle->accept->data) |
1082 | ) { |
1083 | bb_error_msg_and_die("%s: not found in archive", |
1084 | tar_handle->accept->data); |
1085 | } |
1086 | tar_handle->accept = tar_handle->accept->link; |
1087 | } |
1088 | if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */) |
1089 | close(tar_handle->src_fd); |
1090 | |
1091 | return EXIT_SUCCESS; |
1092 | } |