Contents of /tags/mkinitrd-6_2_0/busybox/archival/tar.c
Parent Directory | Revision Log
Revision 996 -
(show annotations)
(download)
Sun May 30 11:54:28 2010 UTC (14 years, 3 months ago) by niro
File MIME type: text/plain
File size: 33252 byte(s)
Sun May 30 11:54:28 2010 UTC (14 years, 3 months ago) by niro
File MIME type: text/plain
File size: 33252 byte(s)
tagged 'mkinitrd-6_2_0'
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 | /* Tar file constants */ |
52 | |
53 | #define TAR_BLOCK_SIZE 512 |
54 | |
55 | /* POSIX tar Header Block, from POSIX 1003.1-1990 */ |
56 | #define NAME_SIZE 100 |
57 | #define NAME_SIZE_STR "100" |
58 | typedef struct TarHeader { /* byte offset */ |
59 | char name[NAME_SIZE]; /* 0-99 */ |
60 | char mode[8]; /* 100-107 */ |
61 | char uid[8]; /* 108-115 */ |
62 | char gid[8]; /* 116-123 */ |
63 | char size[12]; /* 124-135 */ |
64 | char mtime[12]; /* 136-147 */ |
65 | char chksum[8]; /* 148-155 */ |
66 | char typeflag; /* 156-156 */ |
67 | char linkname[NAME_SIZE]; /* 157-256 */ |
68 | /* POSIX: "ustar" NUL "00" */ |
69 | /* GNU tar: "ustar " NUL */ |
70 | /* Normally it's defined as magic[6] followed by |
71 | * version[2], but we put them together to save code. |
72 | */ |
73 | char magic[8]; /* 257-264 */ |
74 | char uname[32]; /* 265-296 */ |
75 | char gname[32]; /* 297-328 */ |
76 | char devmajor[8]; /* 329-336 */ |
77 | char devminor[8]; /* 337-344 */ |
78 | char prefix[155]; /* 345-499 */ |
79 | char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */ |
80 | } TarHeader; |
81 | |
82 | /* |
83 | ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are |
84 | ** the only functions that deal with the HardLinkInfo structure. |
85 | ** Even these functions use the xxxHardLinkInfo() functions. |
86 | */ |
87 | typedef struct HardLinkInfo { |
88 | struct HardLinkInfo *next; /* Next entry in list */ |
89 | dev_t dev; /* Device number */ |
90 | ino_t ino; /* Inode number */ |
91 | // short linkCount; /* (Hard) Link Count */ |
92 | char name[1]; /* Start of filename (must be last) */ |
93 | } HardLinkInfo; |
94 | |
95 | /* Some info to be carried along when creating a new tarball */ |
96 | typedef struct TarBallInfo { |
97 | int tarFd; /* Open-for-write file descriptor |
98 | * for the tarball */ |
99 | int verboseFlag; /* Whether to print extra stuff or not */ |
100 | const llist_t *excludeList; /* List of files to not include */ |
101 | HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */ |
102 | HardLinkInfo *hlInfo; /* Hard Link Info for the current file */ |
103 | //TODO: save only st_dev + st_ino |
104 | struct stat tarFileStatBuf; /* Stat info for the tarball, letting |
105 | * us know the inode and device that the |
106 | * tarball lives, so we can avoid trying |
107 | * to include the tarball into itself */ |
108 | } TarBallInfo; |
109 | |
110 | /* A nice enum with all the possible tar file content types */ |
111 | enum { |
112 | REGTYPE = '0', /* regular file */ |
113 | REGTYPE0 = '\0', /* regular file (ancient bug compat) */ |
114 | LNKTYPE = '1', /* hard link */ |
115 | SYMTYPE = '2', /* symbolic link */ |
116 | CHRTYPE = '3', /* character special */ |
117 | BLKTYPE = '4', /* block special */ |
118 | DIRTYPE = '5', /* directory */ |
119 | FIFOTYPE = '6', /* FIFO special */ |
120 | CONTTYPE = '7', /* reserved */ |
121 | GNULONGLINK = 'K', /* GNU long (>100 chars) link name */ |
122 | GNULONGNAME = 'L', /* GNU long (>100 chars) file name */ |
123 | }; |
124 | |
125 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ |
126 | static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr, |
127 | struct stat *statbuf, |
128 | const char *fileName) |
129 | { |
130 | /* Note: hlInfoHeadPtr can never be NULL! */ |
131 | HardLinkInfo *hlInfo; |
132 | |
133 | hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName)); |
134 | hlInfo->next = *hlInfoHeadPtr; |
135 | *hlInfoHeadPtr = hlInfo; |
136 | hlInfo->dev = statbuf->st_dev; |
137 | hlInfo->ino = statbuf->st_ino; |
138 | // hlInfo->linkCount = statbuf->st_nlink; |
139 | strcpy(hlInfo->name, fileName); |
140 | } |
141 | |
142 | static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr) |
143 | { |
144 | HardLinkInfo *hlInfo; |
145 | HardLinkInfo *hlInfoNext; |
146 | |
147 | if (hlInfoHeadPtr) { |
148 | hlInfo = *hlInfoHeadPtr; |
149 | while (hlInfo) { |
150 | hlInfoNext = hlInfo->next; |
151 | free(hlInfo); |
152 | hlInfo = hlInfoNext; |
153 | } |
154 | *hlInfoHeadPtr = NULL; |
155 | } |
156 | } |
157 | |
158 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */ |
159 | static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf) |
160 | { |
161 | while (hlInfo) { |
162 | if (statbuf->st_ino == hlInfo->ino |
163 | && statbuf->st_dev == hlInfo->dev |
164 | ) { |
165 | DBG("found hardlink:'%s'", hlInfo->name); |
166 | break; |
167 | } |
168 | hlInfo = hlInfo->next; |
169 | } |
170 | return hlInfo; |
171 | } |
172 | |
173 | /* Put an octal string into the specified buffer. |
174 | * The number is zero padded and possibly null terminated. |
175 | * Stores low-order bits only if whole value does not fit. */ |
176 | static void putOctal(char *cp, int len, off_t value) |
177 | { |
178 | char tempBuffer[sizeof(off_t)*3 + 1]; |
179 | char *tempString = tempBuffer; |
180 | int width; |
181 | |
182 | width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value); |
183 | tempString += (width - len); |
184 | |
185 | /* If string has leading zeroes, we can drop one */ |
186 | /* and field will have trailing '\0' */ |
187 | /* (increases chances of compat with other tars) */ |
188 | if (tempString[0] == '0') |
189 | tempString++; |
190 | |
191 | /* Copy the string to the field */ |
192 | memcpy(cp, tempString, len); |
193 | } |
194 | #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b)) |
195 | |
196 | static void chksum_and_xwrite(int fd, struct TarHeader* hp) |
197 | { |
198 | /* POSIX says that checksum is done on unsigned bytes |
199 | * (Sun and HP-UX gets it wrong... more details in |
200 | * GNU tar source) */ |
201 | const unsigned char *cp; |
202 | int chksum, size; |
203 | |
204 | strcpy(hp->magic, "ustar "); |
205 | |
206 | /* Calculate and store the checksum (i.e., the sum of all of the bytes of |
207 | * the header). The checksum field must be filled with blanks for the |
208 | * calculation. The checksum field is formatted differently from the |
209 | * other fields: it has 6 digits, a null, then a space -- rather than |
210 | * digits, followed by a null like the other fields... */ |
211 | memset(hp->chksum, ' ', sizeof(hp->chksum)); |
212 | cp = (const unsigned char *) hp; |
213 | chksum = 0; |
214 | size = sizeof(*hp); |
215 | do { chksum += *cp++; } while (--size); |
216 | putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum); |
217 | |
218 | /* Now write the header out to disk */ |
219 | xwrite(fd, hp, sizeof(*hp)); |
220 | } |
221 | |
222 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
223 | static void writeLongname(int fd, int type, const char *name, int dir) |
224 | { |
225 | static const struct { |
226 | char mode[8]; /* 100-107 */ |
227 | char uid[8]; /* 108-115 */ |
228 | char gid[8]; /* 116-123 */ |
229 | char size[12]; /* 124-135 */ |
230 | char mtime[12]; /* 136-147 */ |
231 | } prefilled = { |
232 | "0000000", |
233 | "0000000", |
234 | "0000000", |
235 | "00000000000", |
236 | "00000000000", |
237 | }; |
238 | struct TarHeader header; |
239 | int size; |
240 | |
241 | dir = !!dir; /* normalize: 0/1 */ |
242 | size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */ |
243 | /* + dir: account for possible '/' */ |
244 | |
245 | memset(&header, 0, sizeof(header)); |
246 | strcpy(header.name, "././@LongLink"); |
247 | memcpy(header.mode, prefilled.mode, sizeof(prefilled)); |
248 | PUT_OCTAL(header.size, size); |
249 | header.typeflag = type; |
250 | chksum_and_xwrite(fd, &header); |
251 | |
252 | /* Write filename[/] and pad the block. */ |
253 | /* dir=0: writes 'name<NUL>', pads */ |
254 | /* dir=1: writes 'name', writes '/<NUL>', pads */ |
255 | dir *= 2; |
256 | xwrite(fd, name, size - dir); |
257 | xwrite(fd, "/", dir); |
258 | size = (-size) & (TAR_BLOCK_SIZE-1); |
259 | memset(&header, 0, size); |
260 | xwrite(fd, &header, size); |
261 | } |
262 | #endif |
263 | |
264 | /* Write out a tar header for the specified file/directory/whatever */ |
265 | void BUG_tar_header_size(void); |
266 | static int writeTarHeader(struct TarBallInfo *tbInfo, |
267 | const char *header_name, const char *fileName, struct stat *statbuf) |
268 | { |
269 | struct TarHeader header; |
270 | |
271 | if (sizeof(header) != 512) |
272 | BUG_tar_header_size(); |
273 | |
274 | memset(&header, 0, sizeof(struct TarHeader)); |
275 | |
276 | strncpy(header.name, header_name, sizeof(header.name)); |
277 | |
278 | /* POSIX says to mask mode with 07777. */ |
279 | PUT_OCTAL(header.mode, statbuf->st_mode & 07777); |
280 | PUT_OCTAL(header.uid, statbuf->st_uid); |
281 | PUT_OCTAL(header.gid, statbuf->st_gid); |
282 | memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */ |
283 | PUT_OCTAL(header.mtime, statbuf->st_mtime); |
284 | |
285 | /* Enter the user and group names */ |
286 | safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname)); |
287 | safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname)); |
288 | |
289 | if (tbInfo->hlInfo) { |
290 | /* This is a hard link */ |
291 | header.typeflag = LNKTYPE; |
292 | strncpy(header.linkname, tbInfo->hlInfo->name, |
293 | sizeof(header.linkname)); |
294 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
295 | /* Write out long linkname if needed */ |
296 | if (header.linkname[sizeof(header.linkname)-1]) |
297 | writeLongname(tbInfo->tarFd, GNULONGLINK, |
298 | tbInfo->hlInfo->name, 0); |
299 | #endif |
300 | } else if (S_ISLNK(statbuf->st_mode)) { |
301 | char *lpath = xmalloc_readlink_or_warn(fileName); |
302 | if (!lpath) |
303 | return FALSE; |
304 | header.typeflag = SYMTYPE; |
305 | strncpy(header.linkname, lpath, sizeof(header.linkname)); |
306 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
307 | /* Write out long linkname if needed */ |
308 | if (header.linkname[sizeof(header.linkname)-1]) |
309 | writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0); |
310 | #else |
311 | /* If it is larger than 100 bytes, bail out */ |
312 | if (header.linkname[sizeof(header.linkname)-1]) { |
313 | free(lpath); |
314 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
315 | return FALSE; |
316 | } |
317 | #endif |
318 | free(lpath); |
319 | } else if (S_ISDIR(statbuf->st_mode)) { |
320 | header.typeflag = DIRTYPE; |
321 | /* Append '/' only if there is a space for it */ |
322 | if (!header.name[sizeof(header.name)-1]) |
323 | header.name[strlen(header.name)] = '/'; |
324 | } else if (S_ISCHR(statbuf->st_mode)) { |
325 | header.typeflag = CHRTYPE; |
326 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
327 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
328 | } else if (S_ISBLK(statbuf->st_mode)) { |
329 | header.typeflag = BLKTYPE; |
330 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
331 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
332 | } else if (S_ISFIFO(statbuf->st_mode)) { |
333 | header.typeflag = FIFOTYPE; |
334 | } else if (S_ISREG(statbuf->st_mode)) { |
335 | if (sizeof(statbuf->st_size) > 4 |
336 | && statbuf->st_size > (off_t)0777777777777LL |
337 | ) { |
338 | bb_error_msg_and_die("can't store file '%s' " |
339 | "of size %"OFF_FMT"u, aborting", |
340 | fileName, statbuf->st_size); |
341 | } |
342 | header.typeflag = REGTYPE; |
343 | PUT_OCTAL(header.size, statbuf->st_size); |
344 | } else { |
345 | bb_error_msg("%s: unknown file type", fileName); |
346 | return FALSE; |
347 | } |
348 | |
349 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
350 | /* Write out long name if needed */ |
351 | /* (we, like GNU tar, output long linkname *before* long name) */ |
352 | if (header.name[sizeof(header.name)-1]) |
353 | writeLongname(tbInfo->tarFd, GNULONGNAME, |
354 | header_name, S_ISDIR(statbuf->st_mode)); |
355 | #endif |
356 | |
357 | /* Now write the header out to disk */ |
358 | chksum_and_xwrite(tbInfo->tarFd, &header); |
359 | |
360 | /* Now do the verbose thing (or not) */ |
361 | if (tbInfo->verboseFlag) { |
362 | FILE *vbFd = stdout; |
363 | |
364 | /* If archive goes to stdout, verbose goes to stderr */ |
365 | if (tbInfo->tarFd == STDOUT_FILENO) |
366 | vbFd = stderr; |
367 | /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */ |
368 | /* We don't have such excesses here: for us "v" == "vv" */ |
369 | /* '/' is probably a GNUism */ |
370 | fprintf(vbFd, "%s%s\n", header_name, |
371 | S_ISDIR(statbuf->st_mode) ? "/" : ""); |
372 | } |
373 | |
374 | return TRUE; |
375 | } |
376 | |
377 | #if ENABLE_FEATURE_TAR_FROM |
378 | static int exclude_file(const llist_t *excluded_files, const char *file) |
379 | { |
380 | while (excluded_files) { |
381 | if (excluded_files->data[0] == '/') { |
382 | if (fnmatch(excluded_files->data, file, |
383 | FNM_PATHNAME | FNM_LEADING_DIR) == 0) |
384 | return 1; |
385 | } else { |
386 | const char *p; |
387 | |
388 | for (p = file; p[0] != '\0'; p++) { |
389 | if ((p == file || p[-1] == '/') |
390 | && p[0] != '/' |
391 | && fnmatch(excluded_files->data, p, |
392 | FNM_PATHNAME | FNM_LEADING_DIR) == 0 |
393 | ) { |
394 | return 1; |
395 | } |
396 | } |
397 | } |
398 | excluded_files = excluded_files->link; |
399 | } |
400 | |
401 | return 0; |
402 | } |
403 | #else |
404 | # define exclude_file(excluded_files, file) 0 |
405 | #endif |
406 | |
407 | static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf, |
408 | void *userData, int depth UNUSED_PARAM) |
409 | { |
410 | struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; |
411 | const char *header_name; |
412 | int inputFileFd = -1; |
413 | |
414 | DBG("writeFileToTarball('%s')", fileName); |
415 | |
416 | /* Strip leading '/' (must be before memorizing hardlink's name) */ |
417 | header_name = fileName; |
418 | while (header_name[0] == '/') { |
419 | static smallint warned; |
420 | |
421 | if (!warned) { |
422 | bb_error_msg("removing leading '/' from member names"); |
423 | warned = 1; |
424 | } |
425 | header_name++; |
426 | } |
427 | |
428 | if (header_name[0] == '\0') |
429 | return TRUE; |
430 | |
431 | /* It is against the rules to archive a socket */ |
432 | if (S_ISSOCK(statbuf->st_mode)) { |
433 | bb_error_msg("%s: socket ignored", fileName); |
434 | return TRUE; |
435 | } |
436 | |
437 | /* |
438 | * Check to see if we are dealing with a hard link. |
439 | * If so - |
440 | * Treat the first occurance of a given dev/inode as a file while |
441 | * treating any additional occurances as hard links. This is done |
442 | * by adding the file information to the HardLinkInfo linked list. |
443 | */ |
444 | tbInfo->hlInfo = NULL; |
445 | if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) { |
446 | DBG("'%s': st_nlink > 1", header_name); |
447 | tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf); |
448 | if (tbInfo->hlInfo == NULL) { |
449 | DBG("'%s': addHardLinkInfo", header_name); |
450 | addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name); |
451 | } |
452 | } |
453 | |
454 | /* It is a bad idea to store the archive we are in the process of creating, |
455 | * so check the device and inode to be sure that this particular file isn't |
456 | * the new tarball */ |
457 | if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev |
458 | && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino |
459 | ) { |
460 | bb_error_msg("%s: file is the archive; skipping", fileName); |
461 | return TRUE; |
462 | } |
463 | |
464 | if (exclude_file(tbInfo->excludeList, header_name)) |
465 | return SKIP; |
466 | |
467 | #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
468 | if (strlen(header_name) >= NAME_SIZE) { |
469 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
470 | return TRUE; |
471 | } |
472 | #endif |
473 | |
474 | /* Is this a regular file? */ |
475 | if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) { |
476 | /* open the file we want to archive, and make sure all is well */ |
477 | inputFileFd = open_or_warn(fileName, O_RDONLY); |
478 | if (inputFileFd < 0) { |
479 | return FALSE; |
480 | } |
481 | } |
482 | |
483 | /* Add an entry to the tarball */ |
484 | if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) { |
485 | return FALSE; |
486 | } |
487 | |
488 | /* If it was a regular file, write out the body */ |
489 | if (inputFileFd >= 0) { |
490 | size_t readSize; |
491 | /* Write the file to the archive. */ |
492 | /* We record size into header first, */ |
493 | /* and then write out file. If file shrinks in between, */ |
494 | /* tar will be corrupted. So we don't allow for that. */ |
495 | /* NB: GNU tar 1.16 warns and pads with zeroes */ |
496 | /* or even seeks back and updates header */ |
497 | bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
498 | ////off_t readSize; |
499 | ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
500 | ////if (readSize != statbuf->st_size && readSize >= 0) { |
501 | //// bb_error_msg_and_die("short read from %s, aborting", fileName); |
502 | ////} |
503 | |
504 | /* Check that file did not grow in between? */ |
505 | /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */ |
506 | |
507 | close(inputFileFd); |
508 | |
509 | /* Pad the file up to the tar block size */ |
510 | /* (a few tricks here in the name of code size) */ |
511 | readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1); |
512 | memset(block_buf, 0, readSize); |
513 | xwrite(tbInfo->tarFd, block_buf, readSize); |
514 | } |
515 | |
516 | return TRUE; |
517 | } |
518 | |
519 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
520 | # if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2) |
521 | # define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd) |
522 | # endif |
523 | /* Don't inline: vfork scares gcc and pessimizes code */ |
524 | static void NOINLINE vfork_compressor(int tar_fd, int gzip) |
525 | { |
526 | pid_t gzipPid; |
527 | # if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2 |
528 | const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; |
529 | # elif ENABLE_FEATURE_SEAMLESS_GZ |
530 | const char *zip_exec = "gzip"; |
531 | # else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */ |
532 | const char *zip_exec = "bzip2"; |
533 | # endif |
534 | // On Linux, vfork never unpauses parent early, although standard |
535 | // allows for that. Do we want to waste bytes checking for it? |
536 | # define WAIT_FOR_CHILD 0 |
537 | volatile int vfork_exec_errno = 0; |
538 | struct fd_pair gzipDataPipe; |
539 | # if WAIT_FOR_CHILD |
540 | struct fd_pair gzipStatusPipe; |
541 | xpiped_pair(gzipStatusPipe); |
542 | # endif |
543 | xpiped_pair(gzipDataPipe); |
544 | |
545 | signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ |
546 | |
547 | # if defined(__GNUC__) && __GNUC__ |
548 | /* Avoid vfork clobbering */ |
549 | (void) &zip_exec; |
550 | # endif |
551 | |
552 | gzipPid = vfork(); |
553 | if (gzipPid < 0) |
554 | bb_perror_msg_and_die("vfork"); |
555 | |
556 | if (gzipPid == 0) { |
557 | /* child */ |
558 | /* NB: close _first_, then move fds! */ |
559 | close(gzipDataPipe.wr); |
560 | # if WAIT_FOR_CHILD |
561 | close(gzipStatusPipe.rd); |
562 | /* gzipStatusPipe.wr will close only on exec - |
563 | * parent waits for this close to happen */ |
564 | fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC); |
565 | # endif |
566 | xmove_fd(gzipDataPipe.rd, 0); |
567 | xmove_fd(tar_fd, 1); |
568 | /* exec gzip/bzip2 program/applet */ |
569 | BB_EXECLP(zip_exec, zip_exec, "-f", NULL); |
570 | vfork_exec_errno = errno; |
571 | _exit(EXIT_FAILURE); |
572 | } |
573 | |
574 | /* parent */ |
575 | xmove_fd(gzipDataPipe.wr, tar_fd); |
576 | close(gzipDataPipe.rd); |
577 | # if WAIT_FOR_CHILD |
578 | close(gzipStatusPipe.wr); |
579 | while (1) { |
580 | char buf; |
581 | int n; |
582 | |
583 | /* Wait until child execs (or fails to) */ |
584 | n = full_read(gzipStatusPipe.rd, &buf, 1); |
585 | if (n < 0 /* && errno == EAGAIN */) |
586 | continue; /* try it again */ |
587 | } |
588 | close(gzipStatusPipe.rd); |
589 | # endif |
590 | if (vfork_exec_errno) { |
591 | errno = vfork_exec_errno; |
592 | bb_perror_msg_and_die("can't execute '%s'", zip_exec); |
593 | } |
594 | } |
595 | #endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */ |
596 | |
597 | |
598 | /* gcc 4.2.1 inlines it, making code bigger */ |
599 | static NOINLINE int writeTarFile(int tar_fd, int verboseFlag, |
600 | int dereferenceFlag, const llist_t *include, |
601 | const llist_t *exclude, int gzip) |
602 | { |
603 | int errorFlag = FALSE; |
604 | struct TarBallInfo tbInfo; |
605 | |
606 | tbInfo.hlInfoHead = NULL; |
607 | tbInfo.tarFd = tar_fd; |
608 | tbInfo.verboseFlag = verboseFlag; |
609 | |
610 | /* Store the stat info for the tarball's file, so |
611 | * can avoid including the tarball into itself.... */ |
612 | if (fstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf) < 0) |
613 | bb_perror_msg_and_die("can't stat tar file"); |
614 | |
615 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
616 | if (gzip) |
617 | vfork_compressor(tbInfo.tarFd, gzip); |
618 | #endif |
619 | |
620 | tbInfo.excludeList = exclude; |
621 | |
622 | /* Read the directory/files and iterate over them one at a time */ |
623 | while (include) { |
624 | if (!recursive_action(include->data, ACTION_RECURSE | |
625 | (dereferenceFlag ? ACTION_FOLLOWLINKS : 0), |
626 | writeFileToTarball, writeFileToTarball, &tbInfo, 0) |
627 | ) { |
628 | errorFlag = TRUE; |
629 | } |
630 | include = include->link; |
631 | } |
632 | /* Write two empty blocks to the end of the archive */ |
633 | memset(block_buf, 0, 2*TAR_BLOCK_SIZE); |
634 | xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE); |
635 | |
636 | /* To be pedantically correct, we would check if the tarball |
637 | * is smaller than 20 tar blocks, and pad it if it was smaller, |
638 | * but that isn't necessary for GNU tar interoperability, and |
639 | * so is considered a waste of space */ |
640 | |
641 | /* Close so the child process (if any) will exit */ |
642 | close(tbInfo.tarFd); |
643 | |
644 | /* Hang up the tools, close up shop, head home */ |
645 | if (ENABLE_FEATURE_CLEAN_UP) |
646 | freeHardLinkInfo(&tbInfo.hlInfoHead); |
647 | |
648 | if (errorFlag) |
649 | bb_error_msg("error exit delayed from previous errors"); |
650 | |
651 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
652 | if (gzip) { |
653 | int status; |
654 | if (safe_waitpid(-1, &status, 0) == -1) |
655 | bb_perror_msg("waitpid"); |
656 | else if (!WIFEXITED(status) || WEXITSTATUS(status)) |
657 | /* gzip was killed or has exited with nonzero! */ |
658 | errorFlag = TRUE; |
659 | } |
660 | #endif |
661 | return errorFlag; |
662 | } |
663 | #else |
664 | int writeTarFile(int tar_fd, int verboseFlag, |
665 | int dereferenceFlag, const llist_t *include, |
666 | const llist_t *exclude, int gzip); |
667 | #endif /* FEATURE_TAR_CREATE */ |
668 | |
669 | #if ENABLE_FEATURE_TAR_FROM |
670 | static llist_t *append_file_list_to_list(llist_t *list) |
671 | { |
672 | FILE *src_stream; |
673 | char *line; |
674 | llist_t *newlist = NULL; |
675 | |
676 | while (list) { |
677 | src_stream = xfopen_for_read(llist_pop(&list)); |
678 | while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
679 | /* kill trailing '/' unless the string is just "/" */ |
680 | char *cp = last_char_is(line, '/'); |
681 | if (cp > line) |
682 | *cp = '\0'; |
683 | llist_add_to(&newlist, line); |
684 | } |
685 | fclose(src_stream); |
686 | } |
687 | return newlist; |
688 | } |
689 | #else |
690 | # define append_file_list_to_list(x) 0 |
691 | #endif |
692 | |
693 | #if ENABLE_FEATURE_SEAMLESS_Z |
694 | static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle) |
695 | { |
696 | /* Can't lseek over pipes */ |
697 | archive_handle->seek = seek_by_read; |
698 | |
699 | /* do the decompression, and cleanup */ |
700 | if (xread_char(archive_handle->src_fd) != 0x1f |
701 | || xread_char(archive_handle->src_fd) != 0x9d |
702 | ) { |
703 | bb_error_msg_and_die("invalid magic"); |
704 | } |
705 | |
706 | open_transformer(archive_handle->src_fd, unpack_Z_stream, "uncompress"); |
707 | archive_handle->offset = 0; |
708 | while (get_header_tar(archive_handle) == EXIT_SUCCESS) |
709 | continue; |
710 | |
711 | /* Can only do one file at a time */ |
712 | return EXIT_FAILURE; |
713 | } |
714 | #else |
715 | # define get_header_tar_Z NULL |
716 | #endif |
717 | |
718 | #ifdef CHECK_FOR_CHILD_EXITCODE |
719 | /* Looks like it isn't needed - tar detects malformed (truncated) |
720 | * archive if e.g. bunzip2 fails */ |
721 | static int child_error; |
722 | |
723 | static void handle_SIGCHLD(int status) |
724 | { |
725 | /* Actually, 'status' is a signo. We reuse it for other needs */ |
726 | |
727 | /* Wait for any child without blocking */ |
728 | if (wait_any_nohang(&status) < 0) |
729 | /* wait failed?! I'm confused... */ |
730 | return; |
731 | |
732 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) |
733 | /* child exited with 0 */ |
734 | return; |
735 | /* Cannot happen? |
736 | if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */ |
737 | child_error = 1; |
738 | } |
739 | #endif |
740 | |
741 | enum { |
742 | OPTBIT_KEEP_OLD = 8, |
743 | IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,) |
744 | IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,) |
745 | IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,) |
746 | IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,) |
747 | IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,) |
748 | IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,) |
749 | IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,) |
750 | IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,) // 16th bit |
751 | IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,) |
752 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
753 | OPTBIT_NUMERIC_OWNER, |
754 | OPTBIT_NOPRESERVE_PERM, |
755 | OPTBIT_OVERWRITE, |
756 | #endif |
757 | OPT_TEST = 1 << 0, // t |
758 | OPT_EXTRACT = 1 << 1, // x |
759 | OPT_BASEDIR = 1 << 2, // C |
760 | OPT_TARNAME = 1 << 3, // f |
761 | OPT_2STDOUT = 1 << 4, // O |
762 | OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner |
763 | OPT_P = 1 << 6, // p |
764 | OPT_VERBOSE = 1 << 7, // v |
765 | OPT_KEEP_OLD = 1 << 8, // k |
766 | OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c |
767 | OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h |
768 | OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j |
769 | OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a |
770 | OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T |
771 | OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X |
772 | OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z |
773 | OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z |
774 | OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m |
775 | OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner |
776 | OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions |
777 | OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite |
778 | }; |
779 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
780 | static const char tar_longopts[] ALIGN1 = |
781 | "list\0" No_argument "t" |
782 | "extract\0" No_argument "x" |
783 | "directory\0" Required_argument "C" |
784 | "file\0" Required_argument "f" |
785 | "to-stdout\0" No_argument "O" |
786 | /* do not restore owner */ |
787 | /* Note: GNU tar handles 'o' as no-same-owner only on extract, |
788 | * on create, 'o' is --old-archive. We do not support --old-archive. */ |
789 | "no-same-owner\0" No_argument "o" |
790 | "same-permissions\0" No_argument "p" |
791 | "verbose\0" No_argument "v" |
792 | "keep-old\0" No_argument "k" |
793 | # if ENABLE_FEATURE_TAR_CREATE |
794 | "create\0" No_argument "c" |
795 | "dereference\0" No_argument "h" |
796 | # endif |
797 | # if ENABLE_FEATURE_SEAMLESS_BZ2 |
798 | "bzip2\0" No_argument "j" |
799 | # endif |
800 | # if ENABLE_FEATURE_SEAMLESS_LZMA |
801 | "lzma\0" No_argument "a" |
802 | # endif |
803 | # if ENABLE_FEATURE_TAR_FROM |
804 | "files-from\0" Required_argument "T" |
805 | "exclude-from\0" Required_argument "X" |
806 | # endif |
807 | # if ENABLE_FEATURE_SEAMLESS_GZ |
808 | "gzip\0" No_argument "z" |
809 | # endif |
810 | # if ENABLE_FEATURE_SEAMLESS_Z |
811 | "compress\0" No_argument "Z" |
812 | # endif |
813 | # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME |
814 | "touch\0" No_argument "m" |
815 | # endif |
816 | /* use numeric uid/gid from tar header, not textual */ |
817 | "numeric-owner\0" No_argument "\xfc" |
818 | /* do not restore mode */ |
819 | "no-same-permissions\0" No_argument "\xfd" |
820 | /* on unpack, open with O_TRUNC and !O_EXCL */ |
821 | "overwrite\0" No_argument "\xfe" |
822 | /* --exclude takes next bit position in option mask, */ |
823 | /* therefore we have to put it _after_ --no-same-permissions */ |
824 | # if ENABLE_FEATURE_TAR_FROM |
825 | "exclude\0" Required_argument "\xff" |
826 | # endif |
827 | ; |
828 | #endif |
829 | |
830 | int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
831 | int tar_main(int argc UNUSED_PARAM, char **argv) |
832 | { |
833 | char FAST_FUNC (*get_header_ptr)(archive_handle_t *) = get_header_tar; |
834 | archive_handle_t *tar_handle; |
835 | char *base_dir = NULL; |
836 | const char *tar_filename = "-"; |
837 | unsigned opt; |
838 | int verboseFlag = 0; |
839 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
840 | llist_t *excludes = NULL; |
841 | #endif |
842 | |
843 | /* Initialise default values */ |
844 | tar_handle = init_handle(); |
845 | tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS |
846 | | ARCHIVE_RESTORE_DATE |
847 | | ARCHIVE_UNLINK_OLD; |
848 | |
849 | /* Apparently only root's tar preserves perms (see bug 3844) */ |
850 | if (getuid() != 0) |
851 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
852 | |
853 | /* Prepend '-' to the first argument if required */ |
854 | opt_complementary = "--:" // first arg is options |
855 | "tt:vv:" // count -t,-v |
856 | "?:" // bail out with usage instead of error return |
857 | "X::T::" // cumulative lists |
858 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
859 | "\xff::" // cumulative lists for --exclude |
860 | #endif |
861 | IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd |
862 | IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive |
863 | IF_NOT_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive |
864 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
865 | applet_long_options = tar_longopts; |
866 | #endif |
867 | #if ENABLE_DESKTOP |
868 | if (argv[1] && argv[1][0] != '-') { |
869 | /* Compat: |
870 | * 1st argument without dash handles options with parameters |
871 | * differently from dashed one: it takes *next argv[i]* |
872 | * as paramenter even if there are more chars in 1st argument: |
873 | * "tar fx TARFILE" - "x" is not taken as f's param |
874 | * but is interpreted as -x option |
875 | * "tar -xf TARFILE" - dashed equivalent of the above |
876 | * "tar -fx ..." - "x" is taken as f's param |
877 | * getopt32 wouldn't handle 1st command correctly. |
878 | * Unfortunately, people do use such commands. |
879 | * We massage argv[1] to work around it by moving 'f' |
880 | * to the end of the string. |
881 | * More contrived "tar fCx TARFILE DIR" still fails, |
882 | * but such commands are much less likely to be used. |
883 | */ |
884 | char *f = strchr(argv[1], 'f'); |
885 | if (f) { |
886 | while (f[1] != '\0') { |
887 | *f = f[1]; |
888 | f++; |
889 | } |
890 | *f = 'f'; |
891 | } |
892 | } |
893 | #endif |
894 | opt = getopt32(argv, |
895 | "txC:f:Oopvk" |
896 | IF_FEATURE_TAR_CREATE( "ch" ) |
897 | IF_FEATURE_SEAMLESS_BZ2( "j" ) |
898 | IF_FEATURE_SEAMLESS_LZMA("a" ) |
899 | IF_FEATURE_TAR_FROM( "T:X:") |
900 | IF_FEATURE_SEAMLESS_GZ( "z" ) |
901 | IF_FEATURE_SEAMLESS_Z( "Z" ) |
902 | IF_FEATURE_TAR_NOPRESERVE_TIME("m") |
903 | , &base_dir // -C dir |
904 | , &tar_filename // -f filename |
905 | IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T |
906 | IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X |
907 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
908 | , &excludes // --exclude |
909 | #endif |
910 | , &verboseFlag // combined count for -t and -v |
911 | , &verboseFlag // combined count for -t and -v |
912 | ); |
913 | //bb_error_msg("opt:%08x", opt); |
914 | argv += optind; |
915 | |
916 | if (verboseFlag) tar_handle->action_header = header_verbose_list; |
917 | if (verboseFlag == 1) tar_handle->action_header = header_list; |
918 | |
919 | if (opt & OPT_EXTRACT) |
920 | tar_handle->action_data = data_extract_all; |
921 | |
922 | if (opt & OPT_2STDOUT) |
923 | tar_handle->action_data = data_extract_to_stdout; |
924 | |
925 | if (opt & OPT_KEEP_OLD) |
926 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; |
927 | |
928 | if (opt & OPT_NUMERIC_OWNER) |
929 | tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER; |
930 | |
931 | if (opt & OPT_NOPRESERVE_OWNER) |
932 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER; |
933 | |
934 | if (opt & OPT_NOPRESERVE_PERM) |
935 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
936 | |
937 | if (opt & OPT_OVERWRITE) { |
938 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; |
939 | tar_handle->ah_flags |= ARCHIVE_O_TRUNC; |
940 | } |
941 | |
942 | if (opt & OPT_GZIP) |
943 | get_header_ptr = get_header_tar_gz; |
944 | |
945 | if (opt & OPT_BZIP2) |
946 | get_header_ptr = get_header_tar_bz2; |
947 | |
948 | if (opt & OPT_LZMA) |
949 | get_header_ptr = get_header_tar_lzma; |
950 | |
951 | if (opt & OPT_COMPRESS) |
952 | get_header_ptr = get_header_tar_Z; |
953 | |
954 | if (opt & OPT_NOPRESERVE_TIME) |
955 | tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE; |
956 | |
957 | #if ENABLE_FEATURE_TAR_FROM |
958 | tar_handle->reject = append_file_list_to_list(tar_handle->reject); |
959 | # if ENABLE_FEATURE_TAR_LONG_OPTIONS |
960 | /* Append excludes to reject */ |
961 | while (excludes) { |
962 | llist_t *next = excludes->link; |
963 | excludes->link = tar_handle->reject; |
964 | tar_handle->reject = excludes; |
965 | excludes = next; |
966 | } |
967 | # endif |
968 | tar_handle->accept = append_file_list_to_list(tar_handle->accept); |
969 | #endif |
970 | |
971 | /* Setup an array of filenames to work with */ |
972 | /* TODO: This is the same as in ar, make a separate function? */ |
973 | while (*argv) { |
974 | /* kill trailing '/' unless the string is just "/" */ |
975 | char *cp = last_char_is(*argv, '/'); |
976 | if (cp > *argv) |
977 | *cp = '\0'; |
978 | llist_add_to_end(&tar_handle->accept, *argv); |
979 | argv++; |
980 | } |
981 | |
982 | if (tar_handle->accept || tar_handle->reject) |
983 | tar_handle->filter = filter_accept_reject_list; |
984 | |
985 | /* Open the tar file */ |
986 | { |
987 | int tar_fd = STDIN_FILENO; |
988 | int flags = O_RDONLY; |
989 | |
990 | if (opt & OPT_CREATE) { |
991 | /* Make sure there is at least one file to tar up */ |
992 | if (tar_handle->accept == NULL) |
993 | bb_error_msg_and_die("empty archive"); |
994 | |
995 | tar_fd = STDOUT_FILENO; |
996 | /* Mimicking GNU tar 1.15.1: */ |
997 | flags = O_WRONLY | O_CREAT | O_TRUNC; |
998 | } |
999 | |
1000 | if (LONE_DASH(tar_filename)) { |
1001 | tar_handle->src_fd = tar_fd; |
1002 | tar_handle->seek = seek_by_read; |
1003 | } else { |
1004 | if (ENABLE_FEATURE_TAR_AUTODETECT && flags == O_RDONLY) { |
1005 | get_header_ptr = get_header_tar; |
1006 | tar_handle->src_fd = open_zipped(tar_filename); |
1007 | if (tar_handle->src_fd < 0) |
1008 | bb_perror_msg_and_die("can't open '%s'", tar_filename); |
1009 | } else { |
1010 | tar_handle->src_fd = xopen(tar_filename, flags); |
1011 | } |
1012 | } |
1013 | } |
1014 | |
1015 | if (base_dir) |
1016 | xchdir(base_dir); |
1017 | |
1018 | #ifdef CHECK_FOR_CHILD_EXITCODE |
1019 | /* We need to know whether child (gzip/bzip/etc) exits abnormally */ |
1020 | signal(SIGCHLD, handle_SIGCHLD); |
1021 | #endif |
1022 | |
1023 | /* Create an archive */ |
1024 | if (opt & OPT_CREATE) { |
1025 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
1026 | int zipMode = 0; |
1027 | if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP)) |
1028 | zipMode = 1; |
1029 | if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2)) |
1030 | zipMode = 2; |
1031 | #endif |
1032 | /* NB: writeTarFile() closes tar_handle->src_fd */ |
1033 | return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE, |
1034 | tar_handle->accept, |
1035 | tar_handle->reject, zipMode); |
1036 | } |
1037 | |
1038 | while (get_header_ptr(tar_handle) == EXIT_SUCCESS) |
1039 | continue; |
1040 | |
1041 | /* Check that every file that should have been extracted was */ |
1042 | while (tar_handle->accept) { |
1043 | if (!find_list_entry(tar_handle->reject, tar_handle->accept->data) |
1044 | && !find_list_entry(tar_handle->passed, tar_handle->accept->data) |
1045 | ) { |
1046 | bb_error_msg_and_die("%s: not found in archive", |
1047 | tar_handle->accept->data); |
1048 | } |
1049 | tar_handle->accept = tar_handle->accept->link; |
1050 | } |
1051 | if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */) |
1052 | close(tar_handle->src_fd); |
1053 | |
1054 | return EXIT_SUCCESS; |
1055 | } |