Annotation of /trunk/mkinitrd-magellan/busybox/archival/tar.c
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Wed Aug 18 21:56:57 2010 UTC (13 years, 8 months ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (13 years, 8 months ago) by niro
File MIME type: text/plain
File size: 34472 byte(s)
-updated to busybox-1.17.1
1 | niro | 532 | /* 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 | niro | 816 | * by Glenn McGrath |
7 | niro | 532 | * |
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 | niro | 816 | #include "libbb.h" |
28 | niro | 532 | #include "unarchive.h" |
29 | niro | 816 | /* FIXME: Stop using this non-standard feature */ |
30 | #ifndef FNM_LEADING_DIR | ||
31 | niro | 984 | # define FNM_LEADING_DIR 0 |
32 | niro | 816 | #endif |
33 | |||
34 | |||
35 | niro | 984 | //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__) |
36 | #define DBG(...) ((void)0) | ||
37 | |||
38 | |||
39 | niro | 816 | #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 | niro | 532 | #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 | niro | 984 | 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 | niro | 532 | |
64 | /* Some info to be carried along when creating a new tarball */ | ||
65 | niro | 984 | typedef struct TarBallInfo { |
66 | niro | 816 | 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 | niro | 984 | //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 | niro | 532 | |
79 | /* A nice enum with all the possible tar file content types */ | ||
80 | niro | 984 | enum { |
81 | niro | 532 | 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 | niro | 816 | static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr, |
96 | niro | 532 | 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 | niro | 984 | // hlInfo->linkCount = statbuf->st_nlink; |
108 | niro | 532 | strcpy(hlInfo->name, fileName); |
109 | } | ||
110 | |||
111 | niro | 816 | static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr) |
112 | niro | 532 | { |
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 | niro | 984 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */ |
128 | niro | 816 | static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf) |
129 | niro | 532 | { |
130 | while (hlInfo) { | ||
131 | niro | 984 | if (statbuf->st_ino == hlInfo->ino |
132 | && statbuf->st_dev == hlInfo->dev | ||
133 | ) { | ||
134 | DBG("found hardlink:'%s'", hlInfo->name); | ||
135 | niro | 532 | break; |
136 | niro | 984 | } |
137 | niro | 532 | 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 | niro | 984 | char tempBuffer[sizeof(off_t)*3 + 1]; |
148 | niro | 532 | 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 | niro | 1123 | static void chksum_and_xwrite(int fd, struct tar_header_t* hp) |
166 | niro | 532 | { |
167 | niro | 816 | /* 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 | niro | 532 | 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 | niro | 1123 | struct tar_header_t header; |
208 | niro | 532 | 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 | niro | 1123 | struct tar_header_t header; |
238 | niro | 532 | |
239 | niro | 1123 | memset(&header, 0, sizeof(header)); |
240 | niro | 532 | |
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 | niro | 816 | char *lpath = xmalloc_readlink_or_warn(fileName); |
267 | if (!lpath) | ||
268 | niro | 532 | 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 | niro | 984 | bb_error_msg_and_die("can't store file '%s' " |
304 | "of size %"OFF_FMT"u, aborting", | ||
305 | niro | 532 | 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 | niro | 984 | /* If archive goes to stdout, verbose goes to stderr */ |
330 | if (tbInfo->tarFd == STDOUT_FILENO) | ||
331 | niro | 532 | 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 | niro | 984 | FNM_PATHNAME | FNM_LEADING_DIR) == 0) |
349 | niro | 532 | return 1; |
350 | } else { | ||
351 | const char *p; | ||
352 | |||
353 | for (p = file; p[0] != '\0'; p++) { | ||
354 | niro | 984 | if ((p == file || p[-1] == '/') |
355 | && p[0] != '/' | ||
356 | && fnmatch(excluded_files->data, p, | ||
357 | FNM_PATHNAME | FNM_LEADING_DIR) == 0 | ||
358 | ) { | ||
359 | niro | 532 | return 1; |
360 | niro | 984 | } |
361 | niro | 532 | } |
362 | } | ||
363 | excluded_files = excluded_files->link; | ||
364 | } | ||
365 | |||
366 | return 0; | ||
367 | } | ||
368 | #else | ||
369 | niro | 984 | # define exclude_file(excluded_files, file) 0 |
370 | niro | 532 | #endif |
371 | |||
372 | niro | 816 | static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf, |
373 | void *userData, int depth UNUSED_PARAM) | ||
374 | niro | 532 | { |
375 | struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; | ||
376 | const char *header_name; | ||
377 | int inputFileFd = -1; | ||
378 | |||
379 | niro | 984 | DBG("writeFileToTarball('%s')", fileName); |
380 | |||
381 | niro | 816 | /* 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 | niro | 532 | /* |
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 | niro | 984 | if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) { |
411 | DBG("'%s': st_nlink > 1", header_name); | ||
412 | niro | 532 | tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf); |
413 | niro | 984 | if (tbInfo->hlInfo == NULL) { |
414 | DBG("'%s': addHardLinkInfo", header_name); | ||
415 | niro | 816 | addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name); |
416 | niro | 984 | } |
417 | niro | 532 | } |
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 | niro | 984 | if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev |
423 | && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino | ||
424 | niro | 816 | ) { |
425 | niro | 532 | bb_error_msg("%s: file is the archive; skipping", fileName); |
426 | return TRUE; | ||
427 | } | ||
428 | |||
429 | niro | 816 | if (exclude_file(tbInfo->excludeList, header_name)) |
430 | return SKIP; | ||
431 | niro | 532 | |
432 | #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS | ||
433 | niro | 816 | if (strlen(header_name) >= NAME_SIZE) { |
434 | niro | 532 | 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 | niro | 816 | inputFileFd = open_or_warn(fileName, O_RDONLY); |
443 | niro | 532 | 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 | niro | 816 | /* Write the file to the archive. */ |
457 | niro | 532 | /* 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 | niro | 816 | memset(block_buf, 0, readSize); |
478 | xwrite(tbInfo->tarFd, block_buf, readSize); | ||
479 | niro | 532 | } |
480 | |||
481 | return TRUE; | ||
482 | } | ||
483 | |||
484 | niro | 816 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
485 | niro | 984 | # if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2) |
486 | # define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd) | ||
487 | # endif | ||
488 | niro | 816 | /* Don't inline: vfork scares gcc and pessimizes code */ |
489 | static void NOINLINE vfork_compressor(int tar_fd, int gzip) | ||
490 | niro | 532 | { |
491 | niro | 816 | pid_t gzipPid; |
492 | niro | 984 | # if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2 |
493 | niro | 816 | const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; |
494 | niro | 984 | # elif ENABLE_FEATURE_SEAMLESS_GZ |
495 | niro | 816 | const char *zip_exec = "gzip"; |
496 | niro | 984 | # else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */ |
497 | niro | 816 | const char *zip_exec = "bzip2"; |
498 | niro | 984 | # endif |
499 | niro | 816 | // On Linux, vfork never unpauses parent early, although standard |
500 | // allows for that. Do we want to waste bytes checking for it? | ||
501 | niro | 984 | # define WAIT_FOR_CHILD 0 |
502 | niro | 816 | volatile int vfork_exec_errno = 0; |
503 | struct fd_pair gzipDataPipe; | ||
504 | niro | 984 | # if WAIT_FOR_CHILD |
505 | niro | 816 | struct fd_pair gzipStatusPipe; |
506 | xpiped_pair(gzipStatusPipe); | ||
507 | niro | 984 | # endif |
508 | niro | 816 | xpiped_pair(gzipDataPipe); |
509 | |||
510 | signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ | ||
511 | |||
512 | niro | 984 | # if defined(__GNUC__) && __GNUC__ |
513 | niro | 816 | /* Avoid vfork clobbering */ |
514 | (void) &zip_exec; | ||
515 | niro | 984 | # endif |
516 | niro | 816 | |
517 | niro | 1123 | gzipPid = xvfork(); |
518 | niro | 816 | |
519 | if (gzipPid == 0) { | ||
520 | /* child */ | ||
521 | /* NB: close _first_, then move fds! */ | ||
522 | close(gzipDataPipe.wr); | ||
523 | niro | 984 | # if WAIT_FOR_CHILD |
524 | niro | 816 | 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 | niro | 984 | # endif |
529 | niro | 816 | 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 | niro | 984 | # if WAIT_FOR_CHILD |
541 | niro | 816 | 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 | niro | 984 | # endif |
553 | niro | 816 | if (vfork_exec_errno) { |
554 | errno = vfork_exec_errno; | ||
555 | niro | 984 | bb_perror_msg_and_die("can't execute '%s'", zip_exec); |
556 | niro | 816 | } |
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 | niro | 532 | 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 | niro | 984 | if (fstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf) < 0) |
576 | bb_perror_msg_and_die("can't stat tar file"); | ||
577 | niro | 532 | |
578 | niro | 816 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
579 | if (gzip) | ||
580 | vfork_compressor(tbInfo.tarFd, gzip); | ||
581 | niro | 532 | #endif |
582 | |||
583 | tbInfo.excludeList = exclude; | ||
584 | |||
585 | /* Read the directory/files and iterate over them one at a time */ | ||
586 | while (include) { | ||
587 | niro | 816 | if (!recursive_action(include->data, ACTION_RECURSE | |
588 | (dereferenceFlag ? ACTION_FOLLOWLINKS : 0), | ||
589 | niro | 984 | writeFileToTarball, writeFileToTarball, &tbInfo, 0) |
590 | ) { | ||
591 | niro | 532 | errorFlag = TRUE; |
592 | } | ||
593 | include = include->link; | ||
594 | } | ||
595 | /* Write two empty blocks to the end of the archive */ | ||
596 | niro | 816 | memset(block_buf, 0, 2*TAR_BLOCK_SIZE); |
597 | xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE); | ||
598 | niro | 532 | |
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 | niro | 816 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
615 | if (gzip) { | ||
616 | niro | 532 | int status; |
617 | niro | 816 | if (safe_waitpid(-1, &status, 0) == -1) |
618 | niro | 532 | 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 | niro | 816 | #endif |
624 | niro | 532 | return errorFlag; |
625 | } | ||
626 | #else | ||
627 | niro | 816 | int writeTarFile(int tar_fd, int verboseFlag, |
628 | int dereferenceFlag, const llist_t *include, | ||
629 | const llist_t *exclude, int gzip); | ||
630 | niro | 532 | #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 | niro | 816 | while (list) { |
640 | src_stream = xfopen_for_read(llist_pop(&list)); | ||
641 | while ((line = xmalloc_fgetline(src_stream)) != NULL) { | ||
642 | niro | 532 | /* 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 | niro | 984 | # define append_file_list_to_list(x) 0 |
654 | niro | 532 | #endif |
655 | |||
656 | niro | 816 | #if ENABLE_FEATURE_SEAMLESS_Z |
657 | static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle) | ||
658 | niro | 532 | { |
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 | niro | 816 | open_transformer(archive_handle->src_fd, unpack_Z_stream, "uncompress"); |
670 | niro | 532 | archive_handle->offset = 0; |
671 | while (get_header_tar(archive_handle) == EXIT_SUCCESS) | ||
672 | niro | 816 | continue; |
673 | niro | 532 | |
674 | /* Can only do one file at a time */ | ||
675 | return EXIT_FAILURE; | ||
676 | } | ||
677 | #else | ||
678 | niro | 984 | # define get_header_tar_Z NULL |
679 | niro | 532 | #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 | niro | 816 | if (wait_any_nohang(&status) < 0) |
692 | niro | 532 | /* wait failed?! I'm confused... */ |
693 | return; | ||
694 | |||
695 | niro | 984 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) |
696 | niro | 532 | /* child exited with 0 */ |
697 | return; | ||
698 | /* Cannot happen? | ||
699 | niro | 816 | if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */ |
700 | niro | 532 | child_error = 1; |
701 | } | ||
702 | #endif | ||
703 | |||
704 | niro | 1123 | //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 | niro | 532 | enum { |
767 | niro | 984 | 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 | niro | 1123 | IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,) |
779 | niro | 984 | OPTBIT_NUMERIC_OWNER, |
780 | niro | 532 | OPTBIT_NOPRESERVE_PERM, |
781 | niro | 984 | OPTBIT_OVERWRITE, |
782 | #endif | ||
783 | niro | 532 | 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 | niro | 984 | 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 | niro | 1123 | OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command |
802 | niro | 984 | 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 | niro | 532 | }; |
806 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS | ||
807 | niro | 816 | 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 | niro | 984 | /* 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 | niro | 816 | "same-permissions\0" No_argument "p" |
818 | "verbose\0" No_argument "v" | ||
819 | "keep-old\0" No_argument "k" | ||
820 | niro | 532 | # if ENABLE_FEATURE_TAR_CREATE |
821 | niro | 816 | "create\0" No_argument "c" |
822 | "dereference\0" No_argument "h" | ||
823 | niro | 532 | # endif |
824 | niro | 816 | # if ENABLE_FEATURE_SEAMLESS_BZ2 |
825 | "bzip2\0" No_argument "j" | ||
826 | niro | 532 | # endif |
827 | niro | 816 | # if ENABLE_FEATURE_SEAMLESS_LZMA |
828 | "lzma\0" No_argument "a" | ||
829 | niro | 532 | # endif |
830 | # if ENABLE_FEATURE_TAR_FROM | ||
831 | niro | 816 | "files-from\0" Required_argument "T" |
832 | "exclude-from\0" Required_argument "X" | ||
833 | niro | 532 | # endif |
834 | niro | 816 | # if ENABLE_FEATURE_SEAMLESS_GZ |
835 | "gzip\0" No_argument "z" | ||
836 | niro | 532 | # endif |
837 | niro | 816 | # if ENABLE_FEATURE_SEAMLESS_Z |
838 | "compress\0" No_argument "Z" | ||
839 | niro | 532 | # endif |
840 | niro | 984 | # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME |
841 | "touch\0" No_argument "m" | ||
842 | # endif | ||
843 | niro | 1123 | # if ENABLE_FEATURE_TAR_TO_COMMAND |
844 | "to-command\0" Required_argument "\xfb" | ||
845 | # endif | ||
846 | niro | 984 | /* 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 | niro | 532 | /* --exclude takes next bit position in option mask, */ |
853 | niro | 984 | /* therefore we have to put it _after_ --no-same-permissions */ |
854 | niro | 532 | # if ENABLE_FEATURE_TAR_FROM |
855 | niro | 816 | "exclude\0" Required_argument "\xff" |
856 | niro | 532 | # endif |
857 | niro | 816 | ; |
858 | niro | 532 | #endif |
859 | |||
860 | niro | 816 | int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
861 | int tar_main(int argc UNUSED_PARAM, char **argv) | ||
862 | niro | 532 | { |
863 | niro | 816 | char FAST_FUNC (*get_header_ptr)(archive_handle_t *) = get_header_tar; |
864 | niro | 532 | 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 | niro | 816 | tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS |
876 | niro | 984 | | ARCHIVE_RESTORE_DATE |
877 | | ARCHIVE_UNLINK_OLD; | ||
878 | niro | 532 | |
879 | niro | 816 | /* Apparently only root's tar preserves perms (see bug 3844) */ |
880 | if (getuid() != 0) | ||
881 | niro | 984 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
882 | niro | 816 | |
883 | niro | 532 | /* 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 | niro | 984 | 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 | niro | 532 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
895 | niro | 816 | applet_long_options = tar_longopts; |
896 | niro | 532 | #endif |
897 | niro | 984 | #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 | niro | 816 | opt = getopt32(argv, |
925 | niro | 984 | "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 | niro | 532 | , &base_dir // -C dir |
934 | , &tar_filename // -f filename | ||
935 | niro | 984 | IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T |
936 | IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X | ||
937 | niro | 1123 | IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command |
938 | niro | 532 | #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 | niro | 984 | //bb_error_msg("opt:%08x", opt); |
945 | niro | 816 | argv += optind; |
946 | niro | 532 | |
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 | niro | 1123 | 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 | niro | 532 | if (opt & OPT_KEEP_OLD) |
963 | niro | 984 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; |
964 | niro | 532 | |
965 | niro | 984 | if (opt & OPT_NUMERIC_OWNER) |
966 | tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER; | ||
967 | niro | 532 | |
968 | niro | 984 | if (opt & OPT_NOPRESERVE_OWNER) |
969 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER; | ||
970 | |||
971 | niro | 532 | if (opt & OPT_NOPRESERVE_PERM) |
972 | niro | 984 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
973 | niro | 532 | |
974 | niro | 984 | if (opt & OPT_OVERWRITE) { |
975 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; | ||
976 | tar_handle->ah_flags |= ARCHIVE_O_TRUNC; | ||
977 | } | ||
978 | |||
979 | niro | 532 | 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 | niro | 984 | if (opt & OPT_NOPRESERVE_TIME) |
992 | tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE; | ||
993 | |||
994 | niro | 532 | #if ENABLE_FEATURE_TAR_FROM |
995 | tar_handle->reject = append_file_list_to_list(tar_handle->reject); | ||
996 | niro | 984 | # if ENABLE_FEATURE_TAR_LONG_OPTIONS |
997 | niro | 532 | /* 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 | niro | 984 | # endif |
1005 | niro | 532 | tar_handle->accept = append_file_list_to_list(tar_handle->accept); |
1006 | #endif | ||
1007 | |||
1008 | /* Setup an array of filenames to work with */ | ||
1009 | niro | 984 | /* TODO: This is the same as in ar, make a separate function? */ |
1010 | niro | 816 | while (*argv) { |
1011 | niro | 532 | /* kill trailing '/' unless the string is just "/" */ |
1012 | niro | 816 | char *cp = last_char_is(*argv, '/'); |
1013 | if (cp > *argv) | ||
1014 | niro | 532 | *cp = '\0'; |
1015 | niro | 816 | llist_add_to_end(&tar_handle->accept, *argv); |
1016 | argv++; | ||
1017 | niro | 532 | } |
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 | niro | 984 | int tar_fd = STDIN_FILENO; |
1025 | int flags = O_RDONLY; | ||
1026 | niro | 532 | |
1027 | if (opt & OPT_CREATE) { | ||
1028 | niro | 984 | /* Make sure there is at least one file to tar up */ |
1029 | niro | 532 | if (tar_handle->accept == NULL) |
1030 | bb_error_msg_and_die("empty archive"); | ||
1031 | |||
1032 | niro | 984 | tar_fd = STDOUT_FILENO; |
1033 | niro | 532 | /* Mimicking GNU tar 1.15.1: */ |
1034 | niro | 816 | flags = O_WRONLY | O_CREAT | O_TRUNC; |
1035 | niro | 532 | } |
1036 | |||
1037 | if (LONE_DASH(tar_filename)) { | ||
1038 | niro | 984 | tar_handle->src_fd = tar_fd; |
1039 | niro | 532 | tar_handle->seek = seek_by_read; |
1040 | } else { | ||
1041 | niro | 984 | if (ENABLE_FEATURE_TAR_AUTODETECT && flags == O_RDONLY) { |
1042 | get_header_ptr = get_header_tar; | ||
1043 | niro | 816 | 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 | niro | 532 | } |
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 | niro | 984 | /* Create an archive */ |
1061 | niro | 532 | if (opt & OPT_CREATE) { |
1062 | niro | 816 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
1063 | niro | 532 | int zipMode = 0; |
1064 | niro | 816 | if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP)) |
1065 | niro | 532 | zipMode = 1; |
1066 | niro | 816 | if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2)) |
1067 | niro | 532 | zipMode = 2; |
1068 | niro | 816 | #endif |
1069 | niro | 532 | /* 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 | niro | 816 | continue; |
1077 | niro | 532 | |
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 | } |