source: MondoRescue/branches/3.3/mindi-busybox/archival/tar.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 40.7 KB
Line 
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 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 source tree.
24 */
25/* TODO: security with -C DESTDIR option can be enhanced.
26 * Consider tar file created via:
27 * $ tar cvf bug.tar anything.txt
28 * $ ln -s /tmp symlink
29 * $ tar --append -f bug.tar symlink
30 * $ rm symlink
31 * $ mkdir symlink
32 * $ tar --append -f bug.tar symlink/evil.py
33 *
34 * This will result in an archive which contains:
35 * $ tar --list -f bug.tar
36 * anything.txt
37 * symlink
38 * symlink/evil.py
39 *
40 * Untarring it puts evil.py in '/tmp' even if the -C DESTDIR is given.
41 * This doesn't feel right, and IIRC GNU tar doesn't do that.
42 */
43
44//config:config TAR
45//config: bool "tar"
46//config: default y
47//config: help
48//config: tar is an archiving program. It's commonly used with gzip to
49//config: create compressed archives. It's probably the most widely used
50//config: UNIX archive program.
51//config:
52//config:config FEATURE_TAR_CREATE
53//config: bool "Enable archive creation"
54//config: default y
55//config: depends on TAR
56//config: help
57//config: If you enable this option you'll be able to create
58//config: tar archives using the `-c' option.
59//config:
60//config:config FEATURE_TAR_AUTODETECT
61//config: bool "Autodetect compressed tarballs"
62//config: default y
63//config: depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA || FEATURE_SEAMLESS_XZ)
64//config: help
65//config: With this option tar can automatically detect compressed
66//config: tarballs. Currently it works only on files (not pipes etc).
67//config:
68//config:config FEATURE_TAR_FROM
69//config: bool "Enable -X (exclude from) and -T (include from) options)"
70//config: default y
71//config: depends on TAR
72//config: help
73//config: If you enable this option you'll be able to specify
74//config: a list of files to include or exclude from an archive.
75//config:
76//config:config FEATURE_TAR_OLDGNU_COMPATIBILITY
77//config: bool "Support for old tar header format"
78//config: default y
79//config: depends on TAR || DPKG
80//config: help
81//config: This option is required to unpack archives created in
82//config: the old GNU format; help to kill this old format by
83//config: repacking your ancient archives with the new format.
84//config:
85//config:config FEATURE_TAR_OLDSUN_COMPATIBILITY
86//config: bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
87//config: default y
88//config: depends on TAR || DPKG
89//config: help
90//config: This option is required to unpack archives created by some old
91//config: version of Sun's tar (it was calculating checksum using signed
92//config: arithmetic). It is said to be fixed in newer Sun tar, but "old"
93//config: tarballs still exist.
94//config:
95//config:config FEATURE_TAR_GNU_EXTENSIONS
96//config: bool "Support for GNU tar extensions (long filenames)"
97//config: default y
98//config: depends on TAR || DPKG
99//config: help
100//config: With this option busybox supports GNU long filenames and
101//config: linknames.
102//config:
103//config:config FEATURE_TAR_LONG_OPTIONS
104//config: bool "Enable long options"
105//config: default y
106//config: depends on TAR && LONG_OPTS
107//config: help
108//config: Enable use of long options, increases size by about 400 Bytes
109//config:
110//config:config FEATURE_TAR_TO_COMMAND
111//config: bool "Support for writing to an external program"
112//config: default y
113//config: depends on TAR && FEATURE_TAR_LONG_OPTIONS
114//config: help
115//config: If you enable this option you'll be able to instruct tar to send
116//config: the contents of each extracted file to the standard input of an
117//config: external program.
118//config:
119//config:config FEATURE_TAR_UNAME_GNAME
120//config: bool "Enable use of user and group names"
121//config: default y
122//config: depends on TAR
123//config: help
124//config: Enables use of user and group names in tar. This affects contents
125//config: listings (-t) and preserving permissions when unpacking (-p).
126//config: +200 bytes.
127//config:
128//config:config FEATURE_TAR_NOPRESERVE_TIME
129//config: bool "Enable -m (do not preserve time) option"
130//config: default y
131//config: depends on TAR
132//config: help
133//config: With this option busybox supports GNU tar -m
134//config: (do not preserve time) option.
135//config:
136//config:config FEATURE_TAR_SELINUX
137//config: bool "Support for extracting SELinux labels"
138//config: default n
139//config: depends on TAR && SELINUX
140//config: help
141//config: With this option busybox supports restoring SELinux labels
142//config: when extracting files from tar archives.
143
144//applet:IF_TAR(APPLET(tar, BB_DIR_BIN, BB_SUID_DROP))
145//kbuild:lib-$(CONFIG_TAR) += tar.o
146
147#include <fnmatch.h>
148#include "libbb.h"
149#include "common_bufsiz.h"
150#include "bb_archive.h"
151/* FIXME: Stop using this non-standard feature */
152#ifndef FNM_LEADING_DIR
153# define FNM_LEADING_DIR 0
154#endif
155
156#if 0
157# define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
158#else
159# define DBG(...) ((void)0)
160#endif
161#define DBG_OPTION_PARSING 0
162
163
164#define block_buf bb_common_bufsiz1
165#define INIT_G() do { setup_common_bufsiz(); } while (0)
166
167
168#if ENABLE_FEATURE_TAR_CREATE
169
170/*
171** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
172** the only functions that deal with the HardLinkInfo structure.
173** Even these functions use the xxxHardLinkInfo() functions.
174*/
175typedef struct HardLinkInfo {
176 struct HardLinkInfo *next; /* Next entry in list */
177 dev_t dev; /* Device number */
178 ino_t ino; /* Inode number */
179// short linkCount; /* (Hard) Link Count */
180 char name[1]; /* Start of filename (must be last) */
181} HardLinkInfo;
182
183/* Some info to be carried along when creating a new tarball */
184typedef struct TarBallInfo {
185 int tarFd; /* Open-for-write file descriptor
186 * for the tarball */
187 int verboseFlag; /* Whether to print extra stuff or not */
188 const llist_t *excludeList; /* List of files to not include */
189 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
190 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
191//TODO: save only st_dev + st_ino
192 struct stat tarFileStatBuf; /* Stat info for the tarball, letting
193 * us know the inode and device that the
194 * tarball lives, so we can avoid trying
195 * to include the tarball into itself */
196} TarBallInfo;
197
198/* A nice enum with all the possible tar file content types */
199enum {
200 REGTYPE = '0', /* regular file */
201 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
202 LNKTYPE = '1', /* hard link */
203 SYMTYPE = '2', /* symbolic link */
204 CHRTYPE = '3', /* character special */
205 BLKTYPE = '4', /* block special */
206 DIRTYPE = '5', /* directory */
207 FIFOTYPE = '6', /* FIFO special */
208 CONTTYPE = '7', /* reserved */
209 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
210 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
211};
212
213/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
214static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
215 struct stat *statbuf,
216 const char *fileName)
217{
218 /* Note: hlInfoHeadPtr can never be NULL! */
219 HardLinkInfo *hlInfo;
220
221 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
222 hlInfo->next = *hlInfoHeadPtr;
223 *hlInfoHeadPtr = hlInfo;
224 hlInfo->dev = statbuf->st_dev;
225 hlInfo->ino = statbuf->st_ino;
226// hlInfo->linkCount = statbuf->st_nlink;
227 strcpy(hlInfo->name, fileName);
228}
229
230static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
231{
232 HardLinkInfo *hlInfo;
233 HardLinkInfo *hlInfoNext;
234
235 if (hlInfoHeadPtr) {
236 hlInfo = *hlInfoHeadPtr;
237 while (hlInfo) {
238 hlInfoNext = hlInfo->next;
239 free(hlInfo);
240 hlInfo = hlInfoNext;
241 }
242 *hlInfoHeadPtr = NULL;
243 }
244}
245
246/* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
247static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
248{
249 while (hlInfo) {
250 if (statbuf->st_ino == hlInfo->ino
251 && statbuf->st_dev == hlInfo->dev
252 ) {
253 DBG("found hardlink:'%s'", hlInfo->name);
254 break;
255 }
256 hlInfo = hlInfo->next;
257 }
258 return hlInfo;
259}
260
261/* Put an octal string into the specified buffer.
262 * The number is zero padded and possibly null terminated.
263 * Stores low-order bits only if whole value does not fit. */
264static void putOctal(char *cp, int len, off_t value)
265{
266 char tempBuffer[sizeof(off_t)*3 + 1];
267 char *tempString = tempBuffer;
268 int width;
269
270 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
271 tempString += (width - len);
272
273 /* If string has leading zeroes, we can drop one */
274 /* and field will have trailing '\0' */
275 /* (increases chances of compat with other tars) */
276 if (tempString[0] == '0')
277 tempString++;
278
279 /* Copy the string to the field */
280 memcpy(cp, tempString, len);
281}
282#define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
283
284static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
285{
286 /* POSIX says that checksum is done on unsigned bytes
287 * (Sun and HP-UX gets it wrong... more details in
288 * GNU tar source) */
289 const unsigned char *cp;
290 int chksum, size;
291
292 strcpy(hp->magic, "ustar ");
293
294 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
295 * the header). The checksum field must be filled with blanks for the
296 * calculation. The checksum field is formatted differently from the
297 * other fields: it has 6 digits, a null, then a space -- rather than
298 * digits, followed by a null like the other fields... */
299 memset(hp->chksum, ' ', sizeof(hp->chksum));
300 cp = (const unsigned char *) hp;
301 chksum = 0;
302 size = sizeof(*hp);
303 do { chksum += *cp++; } while (--size);
304 putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
305
306 /* Now write the header out to disk */
307 xwrite(fd, hp, sizeof(*hp));
308}
309
310#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
311static void writeLongname(int fd, int type, const char *name, int dir)
312{
313 static const struct {
314 char mode[8]; /* 100-107 */
315 char uid[8]; /* 108-115 */
316 char gid[8]; /* 116-123 */
317 char size[12]; /* 124-135 */
318 char mtime[12]; /* 136-147 */
319 } prefilled = {
320 "0000000",
321 "0000000",
322 "0000000",
323 "00000000000",
324 "00000000000",
325 };
326 struct tar_header_t header;
327 int size;
328
329 dir = !!dir; /* normalize: 0/1 */
330 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
331 /* + dir: account for possible '/' */
332
333 memset(&header, 0, sizeof(header));
334 strcpy(header.name, "././@LongLink");
335 memcpy(header.mode, prefilled.mode, sizeof(prefilled));
336 PUT_OCTAL(header.size, size);
337 header.typeflag = type;
338 chksum_and_xwrite(fd, &header);
339
340 /* Write filename[/] and pad the block. */
341 /* dir=0: writes 'name<NUL>', pads */
342 /* dir=1: writes 'name', writes '/<NUL>', pads */
343 dir *= 2;
344 xwrite(fd, name, size - dir);
345 xwrite(fd, "/", dir);
346 size = (-size) & (TAR_BLOCK_SIZE-1);
347 memset(&header, 0, size);
348 xwrite(fd, &header, size);
349}
350#endif
351
352/* Write out a tar header for the specified file/directory/whatever */
353static int writeTarHeader(struct TarBallInfo *tbInfo,
354 const char *header_name, const char *fileName, struct stat *statbuf)
355{
356 struct tar_header_t header;
357
358 memset(&header, 0, sizeof(header));
359
360 strncpy(header.name, header_name, sizeof(header.name));
361
362 /* POSIX says to mask mode with 07777. */
363 PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
364 PUT_OCTAL(header.uid, statbuf->st_uid);
365 PUT_OCTAL(header.gid, statbuf->st_gid);
366 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
367 /* users report that files with negative st_mtime cause trouble, so: */
368 PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
369
370 /* Enter the user and group names */
371 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
372 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
373
374 if (tbInfo->hlInfo) {
375 /* This is a hard link */
376 header.typeflag = LNKTYPE;
377 strncpy(header.linkname, tbInfo->hlInfo->name,
378 sizeof(header.linkname));
379#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
380 /* Write out long linkname if needed */
381 if (header.linkname[sizeof(header.linkname)-1])
382 writeLongname(tbInfo->tarFd, GNULONGLINK,
383 tbInfo->hlInfo->name, 0);
384#endif
385 } else if (S_ISLNK(statbuf->st_mode)) {
386 char *lpath = xmalloc_readlink_or_warn(fileName);
387 if (!lpath)
388 return FALSE;
389 header.typeflag = SYMTYPE;
390 strncpy(header.linkname, lpath, sizeof(header.linkname));
391#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
392 /* Write out long linkname if needed */
393 if (header.linkname[sizeof(header.linkname)-1])
394 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
395#else
396 /* If it is larger than 100 bytes, bail out */
397 if (header.linkname[sizeof(header.linkname)-1]) {
398 free(lpath);
399 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
400 return FALSE;
401 }
402#endif
403 free(lpath);
404 } else if (S_ISDIR(statbuf->st_mode)) {
405 header.typeflag = DIRTYPE;
406 /* Append '/' only if there is a space for it */
407 if (!header.name[sizeof(header.name)-1])
408 header.name[strlen(header.name)] = '/';
409 } else if (S_ISCHR(statbuf->st_mode)) {
410 header.typeflag = CHRTYPE;
411 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
412 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
413 } else if (S_ISBLK(statbuf->st_mode)) {
414 header.typeflag = BLKTYPE;
415 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
416 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
417 } else if (S_ISFIFO(statbuf->st_mode)) {
418 header.typeflag = FIFOTYPE;
419 } else if (S_ISREG(statbuf->st_mode)) {
420 /* header.size field is 12 bytes long */
421 /* Does octal-encoded size fit? */
422 uoff_t filesize = statbuf->st_size;
423 if (sizeof(filesize) <= 4
424 || filesize <= (uoff_t)0777777777777LL
425 ) {
426 PUT_OCTAL(header.size, filesize);
427 }
428 /* Does base256-encoded size fit?
429 * It always does unless off_t is wider than 64 bits.
430 */
431 else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
432#if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
433 && (filesize <= 0x3fffffffffffffffffffffffLL)
434#endif
435 ) {
436 /* GNU tar uses "base-256 encoding" for very large numbers.
437 * Encoding is binary, with highest bit always set as a marker
438 * and sign in next-highest bit:
439 * 80 00 .. 00 - zero
440 * bf ff .. ff - largest positive number
441 * ff ff .. ff - minus 1
442 * c0 00 .. 00 - smallest negative number
443 */
444 char *p8 = header.size + sizeof(header.size);
445 do {
446 *--p8 = (uint8_t)filesize;
447 filesize >>= 8;
448 } while (p8 != header.size);
449 *p8 |= 0x80;
450 } else {
451 bb_error_msg_and_die("can't store file '%s' "
452 "of size %"OFF_FMT"u, aborting",
453 fileName, statbuf->st_size);
454 }
455 header.typeflag = REGTYPE;
456 } else {
457 bb_error_msg("%s: unknown file type", fileName);
458 return FALSE;
459 }
460
461#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
462 /* Write out long name if needed */
463 /* (we, like GNU tar, output long linkname *before* long name) */
464 if (header.name[sizeof(header.name)-1])
465 writeLongname(tbInfo->tarFd, GNULONGNAME,
466 header_name, S_ISDIR(statbuf->st_mode));
467#endif
468
469 /* Now write the header out to disk */
470 chksum_and_xwrite(tbInfo->tarFd, &header);
471
472 /* Now do the verbose thing (or not) */
473 if (tbInfo->verboseFlag) {
474 FILE *vbFd = stdout;
475
476 /* If archive goes to stdout, verbose goes to stderr */
477 if (tbInfo->tarFd == STDOUT_FILENO)
478 vbFd = stderr;
479 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
480 /* We don't have such excesses here: for us "v" == "vv" */
481 /* '/' is probably a GNUism */
482 fprintf(vbFd, "%s%s\n", header_name,
483 S_ISDIR(statbuf->st_mode) ? "/" : "");
484 }
485
486 return TRUE;
487}
488
489#if ENABLE_FEATURE_TAR_FROM
490static int exclude_file(const llist_t *excluded_files, const char *file)
491{
492 while (excluded_files) {
493 if (excluded_files->data[0] == '/') {
494 if (fnmatch(excluded_files->data, file,
495 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
496 return 1;
497 } else {
498 const char *p;
499
500 for (p = file; p[0] != '\0'; p++) {
501 if ((p == file || p[-1] == '/')
502 && p[0] != '/'
503 && fnmatch(excluded_files->data, p,
504 FNM_PATHNAME | FNM_LEADING_DIR) == 0
505 ) {
506 return 1;
507 }
508 }
509 }
510 excluded_files = excluded_files->link;
511 }
512
513 return 0;
514}
515#else
516# define exclude_file(excluded_files, file) 0
517#endif
518
519static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
520 void *userData, int depth UNUSED_PARAM)
521{
522 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
523 const char *header_name;
524 int inputFileFd = -1;
525
526 DBG("writeFileToTarball('%s')", fileName);
527
528 /* Strip leading '/' and such (must be before memorizing hardlink's name) */
529 header_name = strip_unsafe_prefix(fileName);
530
531 if (header_name[0] == '\0')
532 return TRUE;
533
534 /* It is against the rules to archive a socket */
535 if (S_ISSOCK(statbuf->st_mode)) {
536 bb_error_msg("%s: socket ignored", fileName);
537 return TRUE;
538 }
539
540 /*
541 * Check to see if we are dealing with a hard link.
542 * If so -
543 * Treat the first occurance of a given dev/inode as a file while
544 * treating any additional occurances as hard links. This is done
545 * by adding the file information to the HardLinkInfo linked list.
546 */
547 tbInfo->hlInfo = NULL;
548 if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
549 DBG("'%s': st_nlink > 1", header_name);
550 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
551 if (tbInfo->hlInfo == NULL) {
552 DBG("'%s': addHardLinkInfo", header_name);
553 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
554 }
555 }
556
557 /* It is a bad idea to store the archive we are in the process of creating,
558 * so check the device and inode to be sure that this particular file isn't
559 * the new tarball */
560 if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
561 && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
562 ) {
563 bb_error_msg("%s: file is the archive; skipping", fileName);
564 return TRUE;
565 }
566
567 if (exclude_file(tbInfo->excludeList, header_name))
568 return SKIP;
569
570#if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
571 if (strlen(header_name) >= NAME_SIZE) {
572 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
573 return TRUE;
574 }
575#endif
576
577 /* Is this a regular file? */
578 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
579 /* open the file we want to archive, and make sure all is well */
580 inputFileFd = open_or_warn(fileName, O_RDONLY);
581 if (inputFileFd < 0) {
582 return FALSE;
583 }
584 }
585
586 /* Add an entry to the tarball */
587 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
588 return FALSE;
589 }
590
591 /* If it was a regular file, write out the body */
592 if (inputFileFd >= 0) {
593 size_t readSize;
594 /* Write the file to the archive. */
595 /* We record size into header first, */
596 /* and then write out file. If file shrinks in between, */
597 /* tar will be corrupted. So we don't allow for that. */
598 /* NB: GNU tar 1.16 warns and pads with zeroes */
599 /* or even seeks back and updates header */
600 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
601 ////off_t readSize;
602 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
603 ////if (readSize != statbuf->st_size && readSize >= 0) {
604 //// bb_error_msg_and_die("short read from %s, aborting", fileName);
605 ////}
606
607 /* Check that file did not grow in between? */
608 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
609
610 close(inputFileFd);
611
612 /* Pad the file up to the tar block size */
613 /* (a few tricks here in the name of code size) */
614 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
615 memset(block_buf, 0, readSize);
616 xwrite(tbInfo->tarFd, block_buf, readSize);
617 }
618
619 return TRUE;
620}
621
622#if SEAMLESS_COMPRESSION
623/* Don't inline: vfork scares gcc and pessimizes code */
624static void NOINLINE vfork_compressor(int tar_fd, const char *gzip)
625{
626 pid_t gzipPid;
627
628 // On Linux, vfork never unpauses parent early, although standard
629 // allows for that. Do we want to waste bytes checking for it?
630# define WAIT_FOR_CHILD 0
631 volatile int vfork_exec_errno = 0;
632 struct fd_pair gzipDataPipe;
633# if WAIT_FOR_CHILD
634 struct fd_pair gzipStatusPipe;
635 xpiped_pair(gzipStatusPipe);
636# endif
637 xpiped_pair(gzipDataPipe);
638
639 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
640
641 gzipPid = xvfork();
642
643 if (gzipPid == 0) {
644 /* child */
645 /* NB: close _first_, then move fds! */
646 close(gzipDataPipe.wr);
647# if WAIT_FOR_CHILD
648 close(gzipStatusPipe.rd);
649 /* gzipStatusPipe.wr will close only on exec -
650 * parent waits for this close to happen */
651 fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
652# endif
653 xmove_fd(gzipDataPipe.rd, 0);
654 xmove_fd(tar_fd, 1);
655 /* exec gzip/bzip2 program/applet */
656 BB_EXECLP(gzip, gzip, "-f", (char *)0);
657 vfork_exec_errno = errno;
658 _exit(EXIT_FAILURE);
659 }
660
661 /* parent */
662 xmove_fd(gzipDataPipe.wr, tar_fd);
663 close(gzipDataPipe.rd);
664# if WAIT_FOR_CHILD
665 close(gzipStatusPipe.wr);
666 while (1) {
667 char buf;
668 int n;
669
670 /* Wait until child execs (or fails to) */
671 n = full_read(gzipStatusPipe.rd, &buf, 1);
672 if (n < 0 /* && errno == EAGAIN */)
673 continue; /* try it again */
674 }
675 close(gzipStatusPipe.rd);
676# endif
677 if (vfork_exec_errno) {
678 errno = vfork_exec_errno;
679 bb_perror_msg_and_die("can't execute '%s'", gzip);
680 }
681}
682#endif /* SEAMLESS_COMPRESSION */
683
684
685#if !SEAMLESS_COMPRESSION
686/* Do not pass gzip flag to writeTarFile() */
687#define writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude, gzip) \
688 writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude)
689#endif
690/* gcc 4.2.1 inlines it, making code bigger */
691static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
692 int recurseFlags, const llist_t *include,
693 const llist_t *exclude, const char *gzip)
694{
695 int errorFlag = FALSE;
696 struct TarBallInfo tbInfo;
697
698 tbInfo.hlInfoHead = NULL;
699 tbInfo.tarFd = tar_fd;
700 tbInfo.verboseFlag = verboseFlag;
701
702 /* Store the stat info for the tarball's file, so
703 * can avoid including the tarball into itself.... */
704 xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file");
705
706#if SEAMLESS_COMPRESSION
707 if (gzip)
708 vfork_compressor(tbInfo.tarFd, gzip);
709#endif
710
711 tbInfo.excludeList = exclude;
712
713 /* Read the directory/files and iterate over them one at a time */
714 while (include) {
715 if (!recursive_action(include->data, recurseFlags,
716 writeFileToTarball, writeFileToTarball, &tbInfo, 0)
717 ) {
718 errorFlag = TRUE;
719 }
720 include = include->link;
721 }
722 /* Write two empty blocks to the end of the archive */
723 memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
724 xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
725
726 /* To be pedantically correct, we would check if the tarball
727 * is smaller than 20 tar blocks, and pad it if it was smaller,
728 * but that isn't necessary for GNU tar interoperability, and
729 * so is considered a waste of space */
730
731 /* Close so the child process (if any) will exit */
732 close(tbInfo.tarFd);
733
734 /* Hang up the tools, close up shop, head home */
735 if (ENABLE_FEATURE_CLEAN_UP)
736 freeHardLinkInfo(&tbInfo.hlInfoHead);
737
738 if (errorFlag)
739 bb_error_msg("error exit delayed from previous errors");
740
741#if SEAMLESS_COMPRESSION
742 if (gzip) {
743 int status;
744 if (safe_waitpid(-1, &status, 0) == -1)
745 bb_perror_msg("waitpid");
746 else if (!WIFEXITED(status) || WEXITSTATUS(status))
747 /* gzip was killed or has exited with nonzero! */
748 errorFlag = TRUE;
749 }
750#endif
751 return errorFlag;
752}
753#else /* !FEATURE_TAR_CREATE */
754# define writeTarFile(...) 0
755#endif
756
757#if ENABLE_FEATURE_TAR_FROM
758static llist_t *append_file_list_to_list(llist_t *list)
759{
760 FILE *src_stream;
761 char *line;
762 llist_t *newlist = NULL;
763
764 while (list) {
765 src_stream = xfopen_stdin(llist_pop(&list));
766 while ((line = xmalloc_fgetline(src_stream)) != NULL) {
767 /* kill trailing '/' unless the string is just "/" */
768 char *cp = last_char_is(line, '/');
769 if (cp > line)
770 *cp = '\0';
771 llist_add_to_end(&newlist, line);
772 }
773 fclose(src_stream);
774 }
775 return newlist;
776}
777#endif
778
779//usage:#define tar_trivial_usage
780//usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt"
781//usage: IF_FEATURE_SEAMLESS_Z("Z")
782//usage: IF_FEATURE_SEAMLESS_GZ("z")
783//usage: IF_FEATURE_SEAMLESS_XZ("J")
784//usage: IF_FEATURE_SEAMLESS_BZ2("j")
785//usage: IF_FEATURE_SEAMLESS_LZMA("a")
786//usage: IF_FEATURE_TAR_CREATE("h")
787//usage: IF_FEATURE_TAR_NOPRESERVE_TIME("m")
788//usage: "vO] "
789//usage: IF_FEATURE_TAR_FROM("[-X FILE] [-T FILE] ")
790//usage: "[-f TARFILE] [-C DIR] [FILE]..."
791//usage:#define tar_full_usage "\n\n"
792//usage: IF_FEATURE_TAR_CREATE("Create, extract, ")
793//usage: IF_NOT_FEATURE_TAR_CREATE("Extract ")
794//usage: "or list files from a tar file\n"
795//usage: "\nOperation:"
796//usage: IF_FEATURE_TAR_CREATE(
797//usage: "\n c Create"
798//usage: )
799//usage: "\n x Extract"
800//usage: "\n t List"
801//usage: "\n f Name of TARFILE ('-' for stdin/out)"
802//usage: "\n C Change to DIR before operation"
803//usage: "\n v Verbose"
804//usage: IF_FEATURE_SEAMLESS_Z(
805//usage: "\n Z (De)compress using compress"
806//usage: )
807//usage: IF_FEATURE_SEAMLESS_GZ(
808//usage: "\n z (De)compress using gzip"
809//usage: )
810//usage: IF_FEATURE_SEAMLESS_XZ(
811//usage: "\n J (De)compress using xz"
812//usage: )
813//usage: IF_FEATURE_SEAMLESS_BZ2(
814//usage: "\n j (De)compress using bzip2"
815//usage: )
816//usage: IF_FEATURE_SEAMLESS_LZMA(
817//usage: "\n a (De)compress using lzma"
818//usage: )
819//usage: "\n O Extract to stdout"
820//usage: IF_FEATURE_TAR_CREATE(
821//usage: "\n h Follow symlinks"
822//usage: )
823//usage: IF_FEATURE_TAR_NOPRESERVE_TIME(
824//usage: "\n m Don't restore mtime"
825//usage: )
826//usage: IF_FEATURE_TAR_FROM(
827//usage: IF_FEATURE_TAR_LONG_OPTIONS(
828//usage: "\n exclude File to exclude"
829//usage: )
830//usage: "\n X File with names to exclude"
831//usage: "\n T File with names to include"
832//usage: )
833//usage:
834//usage:#define tar_example_usage
835//usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
836//usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
837
838// Supported but aren't in --help:
839// o no-same-owner
840// p same-permissions
841// k keep-old
842// no-recursion
843// numeric-owner
844// no-same-permissions
845// overwrite
846//IF_FEATURE_TAR_TO_COMMAND(
847// to-command
848//)
849
850enum {
851 OPTBIT_KEEP_OLD = 8,
852 IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
853 IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
854 IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
855 IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
856 IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
857 IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
858 IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
859 IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,) // 16th bit
860 IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,)
861 IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
862#if ENABLE_FEATURE_TAR_LONG_OPTIONS
863 OPTBIT_STRIP_COMPONENTS,
864 OPTBIT_NORECURSION,
865 IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,)
866 OPTBIT_NUMERIC_OWNER,
867 OPTBIT_NOPRESERVE_PERM,
868 OPTBIT_OVERWRITE,
869#endif
870 OPT_TEST = 1 << 0, // t
871 OPT_EXTRACT = 1 << 1, // x
872 OPT_BASEDIR = 1 << 2, // C
873 OPT_TARNAME = 1 << 3, // f
874 OPT_2STDOUT = 1 << 4, // O
875 OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
876 OPT_P = 1 << 6, // p
877 OPT_VERBOSE = 1 << 7, // v
878 OPT_KEEP_OLD = 1 << 8, // k
879 OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c
880 OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h
881 OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
882 OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a
883 OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
884 OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
885 OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
886 OPT_XZ = IF_FEATURE_SEAMLESS_XZ( (1 << OPTBIT_XZ )) + 0, // J
887 OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
888 OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
889 OPT_STRIP_COMPONENTS = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_STRIP_COMPONENTS)) + 0, // strip-components
890 OPT_NORECURSION = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION )) + 0, // no-recursion
891 OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command
892 OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner
893 OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
894 OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite
895
896 OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
897};
898#if ENABLE_FEATURE_TAR_LONG_OPTIONS
899static const char tar_longopts[] ALIGN1 =
900 "list\0" No_argument "t"
901 "extract\0" No_argument "x"
902 "directory\0" Required_argument "C"
903 "file\0" Required_argument "f"
904 "to-stdout\0" No_argument "O"
905 /* do not restore owner */
906 /* Note: GNU tar handles 'o' as no-same-owner only on extract,
907 * on create, 'o' is --old-archive. We do not support --old-archive. */
908 "no-same-owner\0" No_argument "o"
909 "same-permissions\0" No_argument "p"
910 "verbose\0" No_argument "v"
911 "keep-old\0" No_argument "k"
912# if ENABLE_FEATURE_TAR_CREATE
913 "create\0" No_argument "c"
914 "dereference\0" No_argument "h"
915# endif
916# if ENABLE_FEATURE_SEAMLESS_BZ2
917 "bzip2\0" No_argument "j"
918# endif
919# if ENABLE_FEATURE_SEAMLESS_LZMA
920 "lzma\0" No_argument "a"
921# endif
922# if ENABLE_FEATURE_TAR_FROM
923 "files-from\0" Required_argument "T"
924 "exclude-from\0" Required_argument "X"
925# endif
926# if ENABLE_FEATURE_SEAMLESS_GZ
927 "gzip\0" No_argument "z"
928# endif
929# if ENABLE_FEATURE_SEAMLESS_XZ
930 "xz\0" No_argument "J"
931# endif
932# if ENABLE_FEATURE_SEAMLESS_Z
933 "compress\0" No_argument "Z"
934# endif
935# if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
936 "touch\0" No_argument "m"
937# endif
938 "strip-components\0" Required_argument "\xf9"
939 "no-recursion\0" No_argument "\xfa"
940# if ENABLE_FEATURE_TAR_TO_COMMAND
941 "to-command\0" Required_argument "\xfb"
942# endif
943 /* use numeric uid/gid from tar header, not textual */
944 "numeric-owner\0" No_argument "\xfc"
945 /* do not restore mode */
946 "no-same-permissions\0" No_argument "\xfd"
947 /* on unpack, open with O_TRUNC and !O_EXCL */
948 "overwrite\0" No_argument "\xfe"
949 /* --exclude takes next bit position in option mask, */
950 /* therefore we have to put it _after_ --no-same-permissions */
951# if ENABLE_FEATURE_TAR_FROM
952 "exclude\0" Required_argument "\xff"
953# endif
954 ;
955#endif
956
957int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
958int tar_main(int argc UNUSED_PARAM, char **argv)
959{
960 archive_handle_t *tar_handle;
961 char *base_dir = NULL;
962 const char *tar_filename = "-";
963 unsigned opt;
964 int verboseFlag = 0;
965#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
966 llist_t *excludes = NULL;
967#endif
968 INIT_G();
969
970 /* Initialise default values */
971 tar_handle = init_handle();
972 tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
973 | ARCHIVE_RESTORE_DATE
974 | ARCHIVE_UNLINK_OLD;
975
976 /* Apparently only root's tar preserves perms (see bug 3844) */
977 if (getuid() != 0)
978 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
979
980 /* Prepend '-' to the first argument if required */
981 opt_complementary = "--:" // first arg is options
982 "tt:vv:" // count -t,-v
983 IF_FEATURE_TAR_FROM("X::T::") // cumulative lists
984#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
985 "\xff::" // --exclude=PATTERN is a list
986#endif
987 IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
988 IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
989 IF_NOT_FEATURE_TAR_CREATE("t--x:x--t") // mutually exclusive
990#if ENABLE_FEATURE_TAR_LONG_OPTIONS
991 ":\xf9+" // --strip-components=NUM
992#endif
993 ;
994#if ENABLE_FEATURE_TAR_LONG_OPTIONS
995 applet_long_options = tar_longopts;
996#endif
997#if ENABLE_DESKTOP
998 /* Lie to buildroot when it starts asking stupid questions. */
999 if (argv[1] && strcmp(argv[1], "--version") == 0) {
1000 // Output of 'tar --version' examples:
1001 // tar (GNU tar) 1.15.1
1002 // tar (GNU tar) 1.25
1003 // bsdtar 2.8.3 - libarchive 2.8.3
1004 puts("tar (busybox) " BB_VER);
1005 return 0;
1006 }
1007 if (argv[1] && argv[1][0] != '-') {
1008 /* Compat:
1009 * 1st argument without dash handles options with parameters
1010 * differently from dashed one: it takes *next argv[i]*
1011 * as paramenter even if there are more chars in 1st argument:
1012 * "tar fx TARFILE" - "x" is not taken as f's param
1013 * but is interpreted as -x option
1014 * "tar -xf TARFILE" - dashed equivalent of the above
1015 * "tar -fx ..." - "x" is taken as f's param
1016 * getopt32 wouldn't handle 1st command correctly.
1017 * Unfortunately, people do use such commands.
1018 * We massage argv[1] to work around it by moving 'f'
1019 * to the end of the string.
1020 * More contrived "tar fCx TARFILE DIR" still fails,
1021 * but such commands are much less likely to be used.
1022 */
1023 char *f = strchr(argv[1], 'f');
1024 if (f) {
1025 while (f[1] != '\0') {
1026 *f = f[1];
1027 f++;
1028 }
1029 *f = 'f';
1030 }
1031 }
1032#endif
1033 opt = getopt32(argv,
1034 "txC:f:Oopvk"
1035 IF_FEATURE_TAR_CREATE( "ch" )
1036 IF_FEATURE_SEAMLESS_BZ2( "j" )
1037 IF_FEATURE_SEAMLESS_LZMA("a" )
1038 IF_FEATURE_TAR_FROM( "T:X:")
1039 IF_FEATURE_SEAMLESS_GZ( "z" )
1040 IF_FEATURE_SEAMLESS_XZ( "J" )
1041 IF_FEATURE_SEAMLESS_Z( "Z" )
1042 IF_FEATURE_TAR_NOPRESERVE_TIME("m")
1043 IF_FEATURE_TAR_LONG_OPTIONS("\xf9:") // --strip-components
1044 , &base_dir // -C dir
1045 , &tar_filename // -f filename
1046 IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
1047 IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
1048#if ENABLE_FEATURE_TAR_LONG_OPTIONS
1049 , &tar_handle->tar__strip_components // --strip-components
1050#endif
1051 IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
1052#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1053 , &excludes // --exclude
1054#endif
1055 , &verboseFlag // combined count for -t and -v
1056 , &verboseFlag // combined count for -t and -v
1057 );
1058#if DBG_OPTION_PARSING
1059 bb_error_msg("opt: 0x%08x", opt);
1060# define showopt(o) bb_error_msg("opt & %s(%x): %x", #o, o, opt & o);
1061 showopt(OPT_TEST );
1062 showopt(OPT_EXTRACT );
1063 showopt(OPT_BASEDIR );
1064 showopt(OPT_TARNAME );
1065 showopt(OPT_2STDOUT );
1066 showopt(OPT_NOPRESERVE_OWNER);
1067 showopt(OPT_P );
1068 showopt(OPT_VERBOSE );
1069 showopt(OPT_KEEP_OLD );
1070 showopt(OPT_CREATE );
1071 showopt(OPT_DEREFERENCE );
1072 showopt(OPT_BZIP2 );
1073 showopt(OPT_LZMA );
1074 showopt(OPT_INCLUDE_FROM );
1075 showopt(OPT_EXCLUDE_FROM );
1076 showopt(OPT_GZIP );
1077 showopt(OPT_XZ );
1078 showopt(OPT_COMPRESS );
1079 showopt(OPT_NOPRESERVE_TIME );
1080 showopt(OPT_STRIP_COMPONENTS);
1081 showopt(OPT_NORECURSION );
1082 showopt(OPT_2COMMAND );
1083 showopt(OPT_NUMERIC_OWNER );
1084 showopt(OPT_NOPRESERVE_PERM );
1085 showopt(OPT_OVERWRITE );
1086 showopt(OPT_ANY_COMPRESS );
1087 bb_error_msg("base_dir:'%s'", base_dir);
1088 bb_error_msg("tar_filename:'%s'", tar_filename);
1089 bb_error_msg("verboseFlag:%d", verboseFlag);
1090 bb_error_msg("tar_handle->tar__to_command:'%s'", tar_handle->tar__to_command);
1091 bb_error_msg("tar_handle->tar__strip_components:%u", tar_handle->tar__strip_components);
1092 return 0;
1093# undef showopt
1094#endif
1095 argv += optind;
1096
1097 if (verboseFlag)
1098 tar_handle->action_header = header_verbose_list;
1099 if (verboseFlag == 1)
1100 tar_handle->action_header = header_list;
1101
1102 if (opt & OPT_EXTRACT)
1103 tar_handle->action_data = data_extract_all;
1104
1105 if (opt & OPT_2STDOUT)
1106 tar_handle->action_data = data_extract_to_stdout;
1107
1108 if (opt & OPT_2COMMAND) {
1109 putenv((char*)"TAR_FILETYPE=f");
1110 signal(SIGPIPE, SIG_IGN);
1111 tar_handle->action_data = data_extract_to_command;
1112 IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
1113 }
1114
1115 if (opt & OPT_KEEP_OLD)
1116 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1117
1118 if (opt & OPT_NUMERIC_OWNER)
1119 tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
1120
1121 if (opt & OPT_NOPRESERVE_OWNER)
1122 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
1123
1124 if (opt & OPT_NOPRESERVE_PERM)
1125 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
1126
1127 if (opt & OPT_OVERWRITE) {
1128 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1129 tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
1130 }
1131
1132 if (opt & OPT_NOPRESERVE_TIME)
1133 tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
1134
1135#if ENABLE_FEATURE_TAR_FROM
1136 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
1137# if ENABLE_FEATURE_TAR_LONG_OPTIONS
1138 /* Append excludes to reject */
1139 while (excludes) {
1140 llist_t *next = excludes->link;
1141 excludes->link = tar_handle->reject;
1142 tar_handle->reject = excludes;
1143 excludes = next;
1144 }
1145# endif
1146 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
1147#endif
1148
1149 /* Setup an array of filenames to work with */
1150 /* TODO: This is the same as in ar, make a separate function? */
1151 while (*argv) {
1152 /* kill trailing '/' unless the string is just "/" */
1153 char *cp = last_char_is(*argv, '/');
1154 if (cp > *argv)
1155 *cp = '\0';
1156 llist_add_to_end(&tar_handle->accept, *argv);
1157 argv++;
1158 }
1159
1160 if (tar_handle->accept || tar_handle->reject)
1161 tar_handle->filter = filter_accept_reject_list;
1162
1163 /* Open the tar file */
1164 {
1165 int tar_fd = STDIN_FILENO;
1166 int flags = O_RDONLY;
1167
1168 if (opt & OPT_CREATE) {
1169 /* Make sure there is at least one file to tar up */
1170 if (tar_handle->accept == NULL)
1171 bb_error_msg_and_die("empty archive");
1172
1173 tar_fd = STDOUT_FILENO;
1174 /* Mimicking GNU tar 1.15.1: */
1175 flags = O_WRONLY | O_CREAT | O_TRUNC;
1176 }
1177
1178 if (LONE_DASH(tar_filename)) {
1179 tar_handle->src_fd = tar_fd;
1180 tar_handle->seek = seek_by_read;
1181 } else {
1182 if (ENABLE_FEATURE_TAR_AUTODETECT
1183 && flags == O_RDONLY
1184 && !(opt & OPT_ANY_COMPRESS)
1185 ) {
1186 tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
1187 if (tar_handle->src_fd < 0)
1188 bb_perror_msg_and_die("can't open '%s'", tar_filename);
1189 } else {
1190 tar_handle->src_fd = xopen(tar_filename, flags);
1191 }
1192 }
1193 }
1194
1195 if (base_dir)
1196 xchdir(base_dir);
1197
1198 //if (SEAMLESS_COMPRESSION)
1199 // /* We need to know whether child (gzip/bzip/etc) exits abnormally */
1200 // signal(SIGCHLD, check_errors_in_children);
1201
1202#if ENABLE_FEATURE_TAR_CREATE
1203 /* Create an archive */
1204 if (opt & OPT_CREATE) {
1205# if SEAMLESS_COMPRESSION
1206 const char *zipMode = NULL;
1207 if (opt & OPT_COMPRESS)
1208 zipMode = "compress";
1209 if (opt & OPT_GZIP)
1210 zipMode = "gzip";
1211 if (opt & OPT_BZIP2)
1212 zipMode = "bzip2";
1213 if (opt & OPT_LZMA)
1214 zipMode = "lzma";
1215 if (opt & OPT_XZ)
1216 zipMode = "xz";
1217# endif
1218 /* NB: writeTarFile() closes tar_handle->src_fd */
1219 return writeTarFile(tar_handle->src_fd, verboseFlag,
1220 (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
1221 | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
1222 tar_handle->accept,
1223 tar_handle->reject, zipMode);
1224 }
1225#endif
1226
1227 if (opt & OPT_ANY_COMPRESS) {
1228 USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate);)
1229 USE_FOR_NOMMU(const char *xformer_prog;)
1230
1231 if (opt & OPT_COMPRESS)
1232 USE_FOR_MMU(xformer = unpack_Z_stream;)
1233 USE_FOR_NOMMU(xformer_prog = "uncompress";)
1234 if (opt & OPT_GZIP)
1235 USE_FOR_MMU(xformer = unpack_gz_stream;)
1236 USE_FOR_NOMMU(xformer_prog = "gunzip";)
1237 if (opt & OPT_BZIP2)
1238 USE_FOR_MMU(xformer = unpack_bz2_stream;)
1239 USE_FOR_NOMMU(xformer_prog = "bunzip2";)
1240 if (opt & OPT_LZMA)
1241 USE_FOR_MMU(xformer = unpack_lzma_stream;)
1242 USE_FOR_NOMMU(xformer_prog = "unlzma";)
1243 if (opt & OPT_XZ)
1244 USE_FOR_MMU(xformer = unpack_xz_stream;)
1245 USE_FOR_NOMMU(xformer_prog = "unxz";)
1246
1247 fork_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
1248 /* Can't lseek over pipes */
1249 tar_handle->seek = seek_by_read;
1250 /*tar_handle->offset = 0; - already is */
1251 }
1252
1253 /* Zero processed headers (== empty file) is not a valid tarball.
1254 * We (ab)use bb_got_signal as exitcode here,
1255 * because check_errors_in_children() uses _it_ as error indicator.
1256 */
1257 bb_got_signal = EXIT_FAILURE;
1258
1259 while (get_header_tar(tar_handle) == EXIT_SUCCESS)
1260 bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
1261
1262 /* Check that every file that should have been extracted was */
1263 while (tar_handle->accept) {
1264 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
1265 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
1266 ) {
1267 bb_error_msg_and_die("%s: not found in archive",
1268 tar_handle->accept->data);
1269 }
1270 tar_handle->accept = tar_handle->accept->link;
1271 }
1272 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
1273 close(tar_handle->src_fd);
1274
1275 if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
1276 /* Set bb_got_signal to 1 if a child died with !0 exitcode */
1277 check_errors_in_children(0);
1278 }
1279
1280 return bb_got_signal;
1281}
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