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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 "bb_archive.h"
150/* FIXME: Stop using this non-standard feature */
151#ifndef FNM_LEADING_DIR
152# define FNM_LEADING_DIR 0
153#endif
154
155
156//#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
157#define DBG(...) ((void)0)
158
159
160#define block_buf bb_common_bufsiz1
161
162
163#if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2
164/* Do not pass gzip flag to writeTarFile() */
165#define writeTarFile(tar_fd, verboseFlag, optFlags, recurseFlags, include, exclude, gzip) \
166 writeTarFile(tar_fd, verboseFlag, optFlags, recurseFlags, include, exclude)
167#endif
168
169
170#if ENABLE_FEATURE_TAR_CREATE
171
172/*
173** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
174** the only functions that deal with the HardLinkInfo structure.
175** Even these functions use the xxxHardLinkInfo() functions.
176*/
177typedef struct HardLinkInfo {
178 struct HardLinkInfo *next; /* Next entry in list */
179 dev_t dev; /* Device number */
180 ino_t ino; /* Inode number */
181// short linkCount; /* (Hard) Link Count */
182 char name[1]; /* Start of filename (must be last) */
183} HardLinkInfo;
184
185/* Some info to be carried along when creating a new tarball */
186typedef struct TarBallInfo {
187 int tarFd; /* Open-for-write file descriptor
188 * for the tarball */
189 int verboseFlag; /* Whether to print extra stuff or not */
190 unsigned optFlags; /* all command line flags */
191
192 const llist_t *excludeList; /* List of files to not include */
193 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
194 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
195//TODO: save only st_dev + st_ino
196 struct stat tarFileStatBuf; /* Stat info for the tarball, letting
197 * us know the inode and device that the
198 * tarball lives, so we can avoid trying
199 * to include the tarball into itself */
200} TarBallInfo;
201
202/* A nice enum with all the possible tar file content types */
203enum {
204 REGTYPE = '0', /* regular file */
205 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
206 LNKTYPE = '1', /* hard link */
207 SYMTYPE = '2', /* symbolic link */
208 CHRTYPE = '3', /* character special */
209 BLKTYPE = '4', /* block special */
210 DIRTYPE = '5', /* directory */
211 FIFOTYPE = '6', /* FIFO special */
212 CONTTYPE = '7', /* reserved */
213 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
214 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
215 EXTTYPE = 'x', /* ext metadata for next file, store selinux_context */
216};
217
218/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
219static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
220 struct stat *statbuf,
221 const char *fileName)
222{
223 /* Note: hlInfoHeadPtr can never be NULL! */
224 HardLinkInfo *hlInfo;
225
226 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
227 hlInfo->next = *hlInfoHeadPtr;
228 *hlInfoHeadPtr = hlInfo;
229 hlInfo->dev = statbuf->st_dev;
230 hlInfo->ino = statbuf->st_ino;
231// hlInfo->linkCount = statbuf->st_nlink;
232 strcpy(hlInfo->name, fileName);
233}
234
235static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
236{
237 HardLinkInfo *hlInfo;
238 HardLinkInfo *hlInfoNext;
239
240 if (hlInfoHeadPtr) {
241 hlInfo = *hlInfoHeadPtr;
242 while (hlInfo) {
243 hlInfoNext = hlInfo->next;
244 free(hlInfo);
245 hlInfo = hlInfoNext;
246 }
247 *hlInfoHeadPtr = NULL;
248 }
249}
250
251/* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
252static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
253{
254 while (hlInfo) {
255 if (statbuf->st_ino == hlInfo->ino
256 && statbuf->st_dev == hlInfo->dev
257 ) {
258 DBG("found hardlink:'%s'", hlInfo->name);
259 break;
260 }
261 hlInfo = hlInfo->next;
262 }
263 return hlInfo;
264}
265
266/* Put an octal string into the specified buffer.
267 * The number is zero padded and possibly null terminated.
268 * Stores low-order bits only if whole value does not fit. */
269static void putOctal(char *cp, int len, off_t value)
270{
271 char tempBuffer[sizeof(off_t)*3 + 1];
272 char *tempString = tempBuffer;
273 int width;
274
275 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
276 tempString += (width - len);
277
278 /* If string has leading zeroes, we can drop one */
279 /* and field will have trailing '\0' */
280 /* (increases chances of compat with other tars) */
281 if (tempString[0] == '0')
282 tempString++;
283
284 /* Copy the string to the field */
285 memcpy(cp, tempString, len);
286}
287#define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
288
289static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
290{
291 /* POSIX says that checksum is done on unsigned bytes
292 * (Sun and HP-UX gets it wrong... more details in
293 * GNU tar source) */
294 const unsigned char *cp;
295 int chksum, size;
296
297 strcpy(hp->magic, "ustar ");
298
299 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
300 * the header). The checksum field must be filled with blanks for the
301 * calculation. The checksum field is formatted differently from the
302 * other fields: it has 6 digits, a null, then a space -- rather than
303 * digits, followed by a null like the other fields... */
304 memset(hp->chksum, ' ', sizeof(hp->chksum));
305 cp = (const unsigned char *) hp;
306 chksum = 0;
307 size = sizeof(*hp);
308 do { chksum += *cp++; } while (--size);
309 putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
310
311 /* Now write the header out to disk */
312 xwrite(fd, hp, sizeof(*hp));
313}
314
315#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
316static void writeLongname(int fd, int type, const char *name, int dir)
317{
318 static const struct {
319 char mode[8]; /* 100-107 */
320 char uid[8]; /* 108-115 */
321 char gid[8]; /* 116-123 */
322 char size[12]; /* 124-135 */
323 char mtime[12]; /* 136-147 */
324 } prefilled = {
325 "0000000",
326 "0000000",
327 "0000000",
328 "00000000000",
329 "00000000000",
330 };
331 struct tar_header_t header;
332 int size;
333
334 dir = !!dir; /* normalize: 0/1 */
335 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
336 /* + dir: account for possible '/' */
337
338 memset(&header, 0, sizeof(header));
339 strcpy(header.name, "././@LongLink");
340 memcpy(header.mode, prefilled.mode, sizeof(prefilled));
341 PUT_OCTAL(header.size, size);
342 header.typeflag = type;
343 chksum_and_xwrite(fd, &header);
344
345 /* Write filename[/] and pad the block. */
346 /* dir=0: writes 'name<NUL>', pads */
347 /* dir=1: writes 'name', writes '/<NUL>', pads */
348 dir *= 2;
349 xwrite(fd, name, size - dir);
350 xwrite(fd, "/", dir);
351 size = (-size) & (TAR_BLOCK_SIZE-1);
352 memset(&header, 0, size);
353 xwrite(fd, &header, size);
354}
355#endif
356
357#if ENABLE_FEATURE_TAR_SELINUX
358# define SELINUX_CONTEXT_KEYWORD "RHT.security.selinux"
359/* Write 2 blocks : extended file header + selinux context */
360static int writeSeHeader(int fd, const char *con, struct tar_header_t *header)
361{
362 char block[TAR_BLOCK_SIZE];
363 struct tar_header_t hd;
364
365 int sz = sizeof(SELINUX_CONTEXT_KEYWORD) + 4 + strlen(con);
366 if (sz >= 100) sz++; /* another ascii digit for size */
367 if (sz > TAR_BLOCK_SIZE)
368 return FALSE;
369
370 memset(&block, 0, TAR_BLOCK_SIZE);
371 sprintf(block, "%d %s=%s\n", sz, SELINUX_CONTEXT_KEYWORD, con);
372
373 /* write duplicated file entry */
374 memcpy(&hd, header, sizeof(hd));
375 hd.typeflag = EXTTYPE;
376 PUT_OCTAL(hd.size, sz);
377 chksum_and_xwrite(fd, &hd);
378
379 /* write selinux context */
380 xwrite(fd, &block, TAR_BLOCK_SIZE);
381 return TRUE;
382}
383#endif
384
385/* Write out a tar header for the specified file/directory/whatever */
386static int writeTarHeader(struct TarBallInfo *tbInfo,
387 const char *header_name, const char *fileName, struct stat *statbuf)
388{
389 struct tar_header_t header;
390
391 memset(&header, 0, sizeof(header));
392
393 strncpy(header.name, header_name, sizeof(header.name));
394
395 /* POSIX says to mask mode with 07777. */
396 PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
397 PUT_OCTAL(header.uid, statbuf->st_uid);
398 PUT_OCTAL(header.gid, statbuf->st_gid);
399 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
400 PUT_OCTAL(header.mtime, statbuf->st_mtime);
401
402 /* Enter the user and group names */
403 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
404 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
405
406 if (tbInfo->hlInfo) {
407 /* This is a hard link */
408 header.typeflag = LNKTYPE;
409 strncpy(header.linkname, tbInfo->hlInfo->name,
410 sizeof(header.linkname));
411#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
412 /* Write out long linkname if needed */
413 if (header.linkname[sizeof(header.linkname)-1])
414 writeLongname(tbInfo->tarFd, GNULONGLINK,
415 tbInfo->hlInfo->name, 0);
416#endif
417 } else if (S_ISLNK(statbuf->st_mode)) {
418 char *lpath = xmalloc_readlink_or_warn(fileName);
419 if (!lpath)
420 return FALSE;
421 header.typeflag = SYMTYPE;
422 strncpy(header.linkname, lpath, sizeof(header.linkname));
423#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
424 /* Write out long linkname if needed */
425 if (header.linkname[sizeof(header.linkname)-1])
426 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
427#else
428 /* If it is larger than 100 bytes, bail out */
429 if (header.linkname[sizeof(header.linkname)-1]) {
430 free(lpath);
431 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
432 return FALSE;
433 }
434#endif
435 free(lpath);
436 } else if (S_ISDIR(statbuf->st_mode)) {
437 header.typeflag = DIRTYPE;
438 /* Append '/' only if there is a space for it */
439 if (!header.name[sizeof(header.name)-1])
440 header.name[strlen(header.name)] = '/';
441 } else if (S_ISCHR(statbuf->st_mode)) {
442 header.typeflag = CHRTYPE;
443 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
444 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
445 } else if (S_ISBLK(statbuf->st_mode)) {
446 header.typeflag = BLKTYPE;
447 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
448 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
449 } else if (S_ISFIFO(statbuf->st_mode)) {
450 header.typeflag = FIFOTYPE;
451 } else if (S_ISREG(statbuf->st_mode)) {
452 /* header.size field is 12 bytes long */
453 /* Does octal-encoded size fit? */
454 uoff_t filesize = statbuf->st_size;
455 if (sizeof(filesize) <= 4
456 || filesize <= (uoff_t)0777777777777LL
457 ) {
458 PUT_OCTAL(header.size, filesize);
459 }
460 /* Does base256-encoded size fit?
461 * It always does unless off_t is wider than 64 bits.
462 */
463 else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
464#if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
465 && (filesize <= 0x3fffffffffffffffffffffffLL)
466#endif
467 ) {
468 /* GNU tar uses "base-256 encoding" for very large numbers.
469 * Encoding is binary, with highest bit always set as a marker
470 * and sign in next-highest bit:
471 * 80 00 .. 00 - zero
472 * bf ff .. ff - largest positive number
473 * ff ff .. ff - minus 1
474 * c0 00 .. 00 - smallest negative number
475 */
476 char *p8 = header.size + sizeof(header.size);
477 do {
478 *--p8 = (uint8_t)filesize;
479 filesize >>= 8;
480 } while (p8 != header.size);
481 *p8 |= 0x80;
482 } else {
483 bb_error_msg_and_die("can't store file '%s' "
484 "of size %"FILESIZE_FMT"u, aborting",
485 fileName, statbuf->st_size);
486 }
487 header.typeflag = REGTYPE;
488 } else {
489 bb_error_msg("%s: unknown file type", fileName);
490 return FALSE;
491 }
492
493#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
494 /* Write out long name if needed */
495 /* (we, like GNU tar, output long linkname *before* long name) */
496 if (header.name[sizeof(header.name)-1])
497 writeLongname(tbInfo->tarFd, GNULONGNAME,
498 header_name, S_ISDIR(statbuf->st_mode));
499#endif
500
501#if ENABLE_FEATURE_TAR_SELINUX
502 if (is_selinux_enabled() && (tbInfo->optFlags & ARCHIVE_STORE_SELINUX)) {
503 security_context_t sid;
504 lgetfilecon(fileName, &sid);
505 if (sid) {
506 // optional extended block
507 writeSeHeader(tbInfo->tarFd, sid, &header);
508 freecon(sid);
509 }
510 }
511#endif
512
513 /* Now write the header out to disk */
514 chksum_and_xwrite(tbInfo->tarFd, &header);
515
516 /* Now do the verbose thing (or not) */
517 if (tbInfo->verboseFlag) {
518 FILE *vbFd = stdout;
519
520 /* If archive goes to stdout, verbose goes to stderr */
521 if (tbInfo->tarFd == STDOUT_FILENO)
522 vbFd = stderr;
523 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
524 /* We don't have such excesses here: for us "v" == "vv" */
525 /* '/' is probably a GNUism */
526 fprintf(vbFd, "%s%s\n", header_name,
527 S_ISDIR(statbuf->st_mode) ? "/" : "");
528 }
529
530 return TRUE;
531}
532
533#if ENABLE_FEATURE_TAR_FROM
534static int exclude_file(const llist_t *excluded_files, const char *file)
535{
536 while (excluded_files) {
537 if (excluded_files->data[0] == '/') {
538 if (fnmatch(excluded_files->data, file,
539 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
540 return 1;
541 } else {
542 const char *p;
543
544 for (p = file; p[0] != '\0'; p++) {
545 if ((p == file || p[-1] == '/')
546 && p[0] != '/'
547 && fnmatch(excluded_files->data, p,
548 FNM_PATHNAME | FNM_LEADING_DIR) == 0
549 ) {
550 return 1;
551 }
552 }
553 }
554 excluded_files = excluded_files->link;
555 }
556
557 return 0;
558}
559#else
560# define exclude_file(excluded_files, file) 0
561#endif
562
563static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
564 void *userData, int depth UNUSED_PARAM)
565{
566 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
567 const char *header_name;
568 int inputFileFd = -1;
569
570 DBG("writeFileToTarball('%s')", fileName);
571
572 /* Strip leading '/' and such (must be before memorizing hardlink's name) */
573 header_name = strip_unsafe_prefix(fileName);
574
575 if (header_name[0] == '\0')
576 return TRUE;
577
578 /* It is against the rules to archive a socket */
579 if (S_ISSOCK(statbuf->st_mode)) {
580 bb_error_msg("%s: socket ignored", fileName);
581 return TRUE;
582 }
583
584 /*
585 * Check to see if we are dealing with a hard link.
586 * If so -
587 * Treat the first occurance of a given dev/inode as a file while
588 * treating any additional occurances as hard links. This is done
589 * by adding the file information to the HardLinkInfo linked list.
590 */
591 tbInfo->hlInfo = NULL;
592 if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
593 DBG("'%s': st_nlink > 1", header_name);
594 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
595 if (tbInfo->hlInfo == NULL) {
596 DBG("'%s': addHardLinkInfo", header_name);
597 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
598 }
599 }
600
601 /* It is a bad idea to store the archive we are in the process of creating,
602 * so check the device and inode to be sure that this particular file isn't
603 * the new tarball */
604 if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
605 && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
606 ) {
607 bb_error_msg("%s: file is the archive; skipping", fileName);
608 return TRUE;
609 }
610
611 if (exclude_file(tbInfo->excludeList, header_name))
612 return SKIP;
613
614#if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
615 if (strlen(header_name) >= NAME_SIZE) {
616 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
617 return TRUE;
618 }
619#endif
620
621 /* Is this a regular file? */
622 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
623 /* open the file we want to archive, and make sure all is well */
624 inputFileFd = open_or_warn(fileName, O_RDONLY);
625 if (inputFileFd < 0) {
626 return FALSE;
627 }
628 }
629
630 /* Add an entry to the tarball */
631 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
632 return FALSE;
633 }
634
635 /* If it was a regular file, write out the body */
636 if (inputFileFd >= 0) {
637 size_t readSize;
638 /* Write the file to the archive. */
639 /* We record size into header first, */
640 /* and then write out file. If file shrinks in between, */
641 /* tar will be corrupted. So we don't allow for that. */
642 /* NB: GNU tar 1.16 warns and pads with zeroes */
643 /* or even seeks back and updates header */
644 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
645 ////off_t readSize;
646 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
647 ////if (readSize != statbuf->st_size && readSize >= 0) {
648 //// bb_error_msg_and_die("short read from %s, aborting", fileName);
649 ////}
650
651 /* Check that file did not grow in between? */
652 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
653
654 close(inputFileFd);
655
656 /* Pad the file up to the tar block size */
657 /* (a few tricks here in the name of code size) */
658 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
659 memset(block_buf, 0, readSize);
660 xwrite(tbInfo->tarFd, block_buf, readSize);
661 }
662
663 return TRUE;
664}
665
666#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
667# if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2)
668# define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd)
669# endif
670/* Don't inline: vfork scares gcc and pessimizes code */
671static void NOINLINE vfork_compressor(int tar_fd, int gzip)
672{
673 pid_t gzipPid;
674# if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2
675 const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
676# elif ENABLE_FEATURE_SEAMLESS_GZ
677 const char *zip_exec = "gzip";
678# else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */
679 const char *zip_exec = "bzip2";
680# endif
681 // On Linux, vfork never unpauses parent early, although standard
682 // allows for that. Do we want to waste bytes checking for it?
683# define WAIT_FOR_CHILD 0
684 volatile int vfork_exec_errno = 0;
685 struct fd_pair gzipDataPipe;
686# if WAIT_FOR_CHILD
687 struct fd_pair gzipStatusPipe;
688 xpiped_pair(gzipStatusPipe);
689# endif
690 xpiped_pair(gzipDataPipe);
691
692 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
693
694# if defined(__GNUC__) && __GNUC__
695 /* Avoid vfork clobbering */
696 (void) &zip_exec;
697# endif
698
699 gzipPid = xvfork();
700
701 if (gzipPid == 0) {
702 /* child */
703 /* NB: close _first_, then move fds! */
704 close(gzipDataPipe.wr);
705# if WAIT_FOR_CHILD
706 close(gzipStatusPipe.rd);
707 /* gzipStatusPipe.wr will close only on exec -
708 * parent waits for this close to happen */
709 fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
710# endif
711 xmove_fd(gzipDataPipe.rd, 0);
712 xmove_fd(tar_fd, 1);
713 /* exec gzip/bzip2 program/applet */
714 BB_EXECLP(zip_exec, zip_exec, "-f", (char *)0);
715 vfork_exec_errno = errno;
716 _exit(EXIT_FAILURE);
717 }
718
719 /* parent */
720 xmove_fd(gzipDataPipe.wr, tar_fd);
721 close(gzipDataPipe.rd);
722# if WAIT_FOR_CHILD
723 close(gzipStatusPipe.wr);
724 while (1) {
725 char buf;
726 int n;
727
728 /* Wait until child execs (or fails to) */
729 n = full_read(gzipStatusPipe.rd, &buf, 1);
730 if (n < 0 /* && errno == EAGAIN */)
731 continue; /* try it again */
732 }
733 close(gzipStatusPipe.rd);
734# endif
735 if (vfork_exec_errno) {
736 errno = vfork_exec_errno;
737 bb_perror_msg_and_die("can't execute '%s'", zip_exec);
738 }
739}
740#endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */
741
742
743/* gcc 4.2.1 inlines it, making code bigger */
744static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
745 unsigned optFlags,
746 int recurseFlags, const llist_t *include,
747 const llist_t *exclude, int gzip)
748{
749 int errorFlag = FALSE;
750 struct TarBallInfo tbInfo;
751
752 tbInfo.hlInfoHead = NULL;
753 tbInfo.tarFd = tar_fd;
754 tbInfo.verboseFlag = verboseFlag;
755 tbInfo.optFlags = optFlags;
756
757 /* Store the stat info for the tarball's file, so
758 * can avoid including the tarball into itself.... */
759 xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file");
760
761#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
762 if (gzip)
763 vfork_compressor(tbInfo.tarFd, gzip);
764#endif
765
766 tbInfo.excludeList = exclude;
767
768 /* Read the directory/files and iterate over them one at a time */
769 while (include) {
770 if (!recursive_action(include->data, recurseFlags,
771 writeFileToTarball, writeFileToTarball, &tbInfo, 0)
772 ) {
773 errorFlag = TRUE;
774 }
775 include = include->link;
776 }
777 /* Write two empty blocks to the end of the archive */
778 memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
779 xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
780
781 /* To be pedantically correct, we would check if the tarball
782 * is smaller than 20 tar blocks, and pad it if it was smaller,
783 * but that isn't necessary for GNU tar interoperability, and
784 * so is considered a waste of space */
785
786 /* Close so the child process (if any) will exit */
787 close(tbInfo.tarFd);
788
789 /* Hang up the tools, close up shop, head home */
790 if (ENABLE_FEATURE_CLEAN_UP)
791 freeHardLinkInfo(&tbInfo.hlInfoHead);
792
793 if (errorFlag)
794 bb_error_msg("error exit delayed from previous errors");
795
796#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
797 if (gzip) {
798 int status;
799 if (safe_waitpid(-1, &status, 0) == -1)
800 bb_perror_msg("waitpid");
801 else if (!WIFEXITED(status) || WEXITSTATUS(status))
802 /* gzip was killed or has exited with nonzero! */
803 errorFlag = TRUE;
804 }
805#endif
806 return errorFlag;
807}
808#else
809int writeTarFile(int tar_fd, int verboseFlag,
810 unsigned optFlags,
811 int recurseFlags, const llist_t *include,
812 const llist_t *exclude, int gzip);
813#endif /* FEATURE_TAR_CREATE */
814
815#if ENABLE_FEATURE_TAR_FROM
816static llist_t *append_file_list_to_list(llist_t *list)
817{
818 FILE *src_stream;
819 char *line;
820 llist_t *newlist = NULL;
821
822 while (list) {
823 src_stream = xfopen_stdin(llist_pop(&list));
824 while ((line = xmalloc_fgetline(src_stream)) != NULL) {
825 /* kill trailing '/' unless the string is just "/" */
826 char *cp = last_char_is(line, '/');
827 if (cp > line)
828 *cp = '\0';
829 llist_add_to_end(&newlist, line);
830 }
831 fclose(src_stream);
832 }
833 return newlist;
834}
835#endif
836
837//usage:#define tar_trivial_usage
838//usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt"
839//usage: IF_FEATURE_SEAMLESS_Z("Z")
840//usage: IF_FEATURE_SEAMLESS_GZ("z")
841//usage: IF_FEATURE_SEAMLESS_XZ("J")
842//usage: IF_FEATURE_SEAMLESS_BZ2("j")
843//usage: IF_FEATURE_SEAMLESS_LZMA("a")
844//usage: IF_FEATURE_TAR_CREATE("h")
845//usage: IF_FEATURE_TAR_NOPRESERVE_TIME("m")
846//usage: IF_FEATURE_TAR_SELINUX("p")
847//usage: "vO] "
848//usage: IF_FEATURE_TAR_FROM("[-X FILE] [-T FILE] ")
849//usage: "[-f TARFILE] [-C DIR] [FILE]..."
850//usage:#define tar_full_usage "\n\n"
851//usage: IF_FEATURE_TAR_CREATE("Create, extract, ")
852//usage: IF_NOT_FEATURE_TAR_CREATE("Extract ")
853//usage: "or list files from a tar file\n"
854//usage: "\nOperation:"
855//usage: IF_FEATURE_TAR_CREATE(
856//usage: "\n c Create"
857//usage: )
858//usage: "\n x Extract"
859//usage: "\n t List"
860//usage: "\n f Name of TARFILE ('-' for stdin/out)"
861//usage: "\n C Change to DIR before operation"
862//usage: "\n v Verbose"
863//usage: IF_FEATURE_SEAMLESS_Z(
864//usage: "\n Z (De)compress using compress"
865//usage: )
866//usage: IF_FEATURE_SEAMLESS_GZ(
867//usage: "\n z (De)compress using gzip"
868//usage: )
869//usage: IF_FEATURE_SEAMLESS_XZ(
870//usage: "\n J (De)compress using xz"
871//usage: )
872//usage: IF_FEATURE_SEAMLESS_BZ2(
873//usage: "\n j (De)compress using bzip2"
874//usage: )
875//usage: IF_FEATURE_SEAMLESS_LZMA(
876//usage: "\n a (De)compress using lzma"
877//usage: )
878//usage: "\n O Extract to stdout"
879//usage: IF_FEATURE_TAR_CREATE(
880//usage: "\n h Follow symlinks"
881//usage: )
882//usage: IF_FEATURE_TAR_NOPRESERVE_TIME(
883//usage: "\n m Don't restore mtime"
884//usage: )
885//usage: IF_FEATURE_TAR_FROM(
886//usage: IF_FEATURE_TAR_LONG_OPTIONS(
887//usage: "\n exclude File to exclude"
888//usage: )
889//usage: "\n X File with names to exclude"
890//usage: "\n T File with names to include"
891//usage: )
892//usage: IF_FEATURE_TAR_SELINUX(
893//usage: "\n p Store SELinux contexts"
894//usage: )
895//usage:
896//usage:#define tar_example_usage
897//usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
898//usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
899
900// Supported but aren't in --help:
901// o no-same-owner
902// p same-permissions
903// k keep-old
904// no-recursion
905// numeric-owner
906// no-same-permissions
907// overwrite
908//IF_FEATURE_TAR_TO_COMMAND(
909// to-command
910//)
911
912enum {
913 OPTBIT_KEEP_OLD = 8,
914 IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
915 IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
916 IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
917 IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
918 IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
919 IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
920 IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
921 IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,) // 16th bit
922 IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,)
923 IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
924#if ENABLE_FEATURE_TAR_LONG_OPTIONS
925 OPTBIT_NORECURSION,
926 IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,)
927 OPTBIT_NUMERIC_OWNER,
928 OPTBIT_NOPRESERVE_PERM,
929 OPTBIT_OVERWRITE,
930#endif
931 OPT_TEST = 1 << 0, // t
932 OPT_EXTRACT = 1 << 1, // x
933 OPT_BASEDIR = 1 << 2, // C
934 OPT_TARNAME = 1 << 3, // f
935 OPT_2STDOUT = 1 << 4, // O
936 OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
937 OPT_P = 1 << 6, // p
938 OPT_VERBOSE = 1 << 7, // v
939 OPT_KEEP_OLD = 1 << 8, // k
940 OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c
941 OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h
942 OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
943 OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a
944 OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
945 OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
946 OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
947 OPT_XZ = IF_FEATURE_SEAMLESS_XZ( (1 << OPTBIT_XZ )) + 0, // J
948 OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
949 OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
950 OPT_NORECURSION = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION )) + 0, // no-recursion
951 OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command
952 OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner
953 OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
954 OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite
955
956 OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
957};
958#if ENABLE_FEATURE_TAR_LONG_OPTIONS
959static const char tar_longopts[] ALIGN1 =
960 "list\0" No_argument "t"
961 "extract\0" No_argument "x"
962 "directory\0" Required_argument "C"
963 "file\0" Required_argument "f"
964 "to-stdout\0" No_argument "O"
965 /* do not restore owner */
966 /* Note: GNU tar handles 'o' as no-same-owner only on extract,
967 * on create, 'o' is --old-archive. We do not support --old-archive. */
968 "no-same-owner\0" No_argument "o"
969 "same-permissions\0" No_argument "p"
970 "verbose\0" No_argument "v"
971 "keep-old\0" No_argument "k"
972# if ENABLE_FEATURE_TAR_CREATE
973 "create\0" No_argument "c"
974 "dereference\0" No_argument "h"
975# endif
976# if ENABLE_FEATURE_SEAMLESS_BZ2
977 "bzip2\0" No_argument "j"
978# endif
979# if ENABLE_FEATURE_SEAMLESS_LZMA
980 "lzma\0" No_argument "a"
981# endif
982# if ENABLE_FEATURE_TAR_FROM
983 "files-from\0" Required_argument "T"
984 "exclude-from\0" Required_argument "X"
985# endif
986# if ENABLE_FEATURE_SEAMLESS_GZ
987 "gzip\0" No_argument "z"
988# endif
989# if ENABLE_FEATURE_SEAMLESS_XZ
990 "xz\0" No_argument "J"
991# endif
992# if ENABLE_FEATURE_SEAMLESS_Z
993 "compress\0" No_argument "Z"
994# endif
995# if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
996 "touch\0" No_argument "m"
997# endif
998 "no-recursion\0" No_argument "\xfa"
999# if ENABLE_FEATURE_TAR_TO_COMMAND
1000 "to-command\0" Required_argument "\xfb"
1001# endif
1002 /* use numeric uid/gid from tar header, not textual */
1003 "numeric-owner\0" No_argument "\xfc"
1004 /* do not restore mode */
1005 "no-same-permissions\0" No_argument "\xfd"
1006 /* on unpack, open with O_TRUNC and !O_EXCL */
1007 "overwrite\0" No_argument "\xfe"
1008 /* --exclude takes next bit position in option mask, */
1009 /* therefore we have to put it _after_ --no-same-permissions */
1010# if ENABLE_FEATURE_TAR_FROM
1011 "exclude\0" Required_argument "\xff"
1012# endif
1013 ;
1014#endif
1015
1016int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1017int tar_main(int argc UNUSED_PARAM, char **argv)
1018{
1019 archive_handle_t *tar_handle;
1020 char *base_dir = NULL;
1021 const char *tar_filename = "-";
1022 unsigned opt;
1023 int verboseFlag = 0;
1024#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1025 llist_t *excludes = NULL;
1026#endif
1027
1028 /* Initialise default values */
1029 tar_handle = init_handle();
1030 tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
1031 | ARCHIVE_RESTORE_DATE
1032 | ARCHIVE_UNLINK_OLD;
1033
1034 /* Apparently only root's tar preserves perms (see bug 3844) */
1035 if (getuid() != 0)
1036 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
1037
1038 /* Prepend '-' to the first argument if required */
1039 opt_complementary = "--:" // first arg is options
1040 "tt:vv:" // count -t,-v
1041 IF_FEATURE_TAR_FROM("X::T::") // cumulative lists
1042#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1043 "\xff::" // cumulative lists for --exclude
1044#endif
1045 IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
1046 IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
1047 IF_NOT_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
1048#if ENABLE_FEATURE_TAR_LONG_OPTIONS
1049 applet_long_options = tar_longopts;
1050#endif
1051#if ENABLE_DESKTOP
1052 if (argv[1] && argv[1][0] != '-') {
1053 /* Compat:
1054 * 1st argument without dash handles options with parameters
1055 * differently from dashed one: it takes *next argv[i]*
1056 * as paramenter even if there are more chars in 1st argument:
1057 * "tar fx TARFILE" - "x" is not taken as f's param
1058 * but is interpreted as -x option
1059 * "tar -xf TARFILE" - dashed equivalent of the above
1060 * "tar -fx ..." - "x" is taken as f's param
1061 * getopt32 wouldn't handle 1st command correctly.
1062 * Unfortunately, people do use such commands.
1063 * We massage argv[1] to work around it by moving 'f'
1064 * to the end of the string.
1065 * More contrived "tar fCx TARFILE DIR" still fails,
1066 * but such commands are much less likely to be used.
1067 */
1068 char *f = strchr(argv[1], 'f');
1069 if (f) {
1070 while (f[1] != '\0') {
1071 *f = f[1];
1072 f++;
1073 }
1074 *f = 'f';
1075 }
1076 }
1077#endif
1078 opt = getopt32(argv,
1079 "txC:f:Oopvk"
1080 IF_FEATURE_TAR_CREATE( "ch" )
1081 IF_FEATURE_SEAMLESS_BZ2( "j" )
1082 IF_FEATURE_SEAMLESS_LZMA("a" )
1083 IF_FEATURE_TAR_FROM( "T:X:")
1084 IF_FEATURE_SEAMLESS_GZ( "z" )
1085 IF_FEATURE_SEAMLESS_XZ( "J" )
1086 IF_FEATURE_SEAMLESS_Z( "Z" )
1087 IF_FEATURE_TAR_NOPRESERVE_TIME("m")
1088 , &base_dir // -C dir
1089 , &tar_filename // -f filename
1090 IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
1091 IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
1092 IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
1093#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1094 , &excludes // --exclude
1095#endif
1096 , &verboseFlag // combined count for -t and -v
1097 , &verboseFlag // combined count for -t and -v
1098 );
1099 //bb_error_msg("opt:%08x", opt);
1100 argv += optind;
1101
1102 if (verboseFlag) tar_handle->action_header = header_verbose_list;
1103 if (verboseFlag == 1) tar_handle->action_header = header_list;
1104
1105 if (opt & OPT_EXTRACT)
1106 tar_handle->action_data = data_extract_all;
1107
1108 if (opt & OPT_2STDOUT)
1109 tar_handle->action_data = data_extract_to_stdout;
1110
1111 if (opt & OPT_2COMMAND) {
1112 putenv((char*)"TAR_FILETYPE=f");
1113 signal(SIGPIPE, SIG_IGN);
1114 tar_handle->action_data = data_extract_to_command;
1115 IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
1116 }
1117
1118 if (opt & OPT_KEEP_OLD)
1119 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1120
1121 if (opt & OPT_NUMERIC_OWNER)
1122 tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
1123
1124 if (opt & OPT_NOPRESERVE_OWNER)
1125 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
1126
1127 if (opt & OPT_NOPRESERVE_PERM)
1128 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
1129
1130#if ENABLE_FEATURE_TAR_SELINUX
1131 if (opt & OPT_P)
1132 tar_handle->ah_flags |= ARCHIVE_STORE_SELINUX;
1133#endif
1134
1135 if (opt & OPT_OVERWRITE) {
1136 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1137 tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
1138 }
1139
1140 if (opt & OPT_NOPRESERVE_TIME)
1141 tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
1142
1143#if ENABLE_FEATURE_TAR_FROM
1144 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
1145# if ENABLE_FEATURE_TAR_LONG_OPTIONS
1146 /* Append excludes to reject */
1147 while (excludes) {
1148 llist_t *next = excludes->link;
1149 excludes->link = tar_handle->reject;
1150 tar_handle->reject = excludes;
1151 excludes = next;
1152 }
1153# endif
1154 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
1155#endif
1156
1157 /* Setup an array of filenames to work with */
1158 /* TODO: This is the same as in ar, make a separate function? */
1159 while (*argv) {
1160 /* kill trailing '/' unless the string is just "/" */
1161 char *cp = last_char_is(*argv, '/');
1162 if (cp > *argv)
1163 *cp = '\0';
1164 llist_add_to_end(&tar_handle->accept, *argv);
1165 argv++;
1166 }
1167
1168 if (tar_handle->accept || tar_handle->reject)
1169 tar_handle->filter = filter_accept_reject_list;
1170
1171 /* Open the tar file */
1172 {
1173 int tar_fd = STDIN_FILENO;
1174 int flags = O_RDONLY;
1175
1176 if (opt & OPT_CREATE) {
1177 /* Make sure there is at least one file to tar up */
1178 if (tar_handle->accept == NULL)
1179 bb_error_msg_and_die("empty archive");
1180
1181 tar_fd = STDOUT_FILENO;
1182 /* Mimicking GNU tar 1.15.1: */
1183 flags = O_WRONLY | O_CREAT | O_TRUNC;
1184 }
1185
1186 if (LONE_DASH(tar_filename)) {
1187 tar_handle->src_fd = tar_fd;
1188 tar_handle->seek = seek_by_read;
1189 } else {
1190 if (ENABLE_FEATURE_TAR_AUTODETECT
1191 && flags == O_RDONLY
1192 && !(opt & OPT_ANY_COMPRESS)
1193 ) {
1194 tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
1195 if (tar_handle->src_fd < 0)
1196 bb_perror_msg_and_die("can't open '%s'", tar_filename);
1197 } else {
1198 tar_handle->src_fd = xopen(tar_filename, flags);
1199 }
1200 }
1201 }
1202
1203 if (base_dir)
1204 xchdir(base_dir);
1205
1206 //if (SEAMLESS_COMPRESSION || OPT_COMPRESS)
1207 // /* We need to know whether child (gzip/bzip/etc) exits abnormally */
1208 // signal(SIGCHLD, check_errors_in_children);
1209
1210 /* Create an archive */
1211 if (opt & OPT_CREATE) {
1212#if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
1213 int zipMode = 0;
1214 if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP))
1215 zipMode = 1;
1216 if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2))
1217 zipMode = 2;
1218#endif
1219 /* NB: writeTarFile() closes tar_handle->src_fd */
1220 return writeTarFile(tar_handle->src_fd, verboseFlag,
1221 tar_handle->ah_flags,
1222 (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
1223 | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
1224 tar_handle->accept,
1225 tar_handle->reject, zipMode);
1226 }
1227
1228 if (opt & OPT_ANY_COMPRESS) {
1229 USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd);)
1230 USE_FOR_NOMMU(const char *xformer_prog;)
1231
1232 if (opt & OPT_COMPRESS)
1233 USE_FOR_MMU(xformer = unpack_Z_stream;)
1234 USE_FOR_NOMMU(xformer_prog = "uncompress";)
1235 if (opt & OPT_GZIP)
1236 USE_FOR_MMU(xformer = unpack_gz_stream;)
1237 USE_FOR_NOMMU(xformer_prog = "gunzip";)
1238 if (opt & OPT_BZIP2)
1239 USE_FOR_MMU(xformer = unpack_bz2_stream;)
1240 USE_FOR_NOMMU(xformer_prog = "bunzip2";)
1241 if (opt & OPT_LZMA)
1242 USE_FOR_MMU(xformer = unpack_lzma_stream;)
1243 USE_FOR_NOMMU(xformer_prog = "unlzma";)
1244 if (opt & OPT_XZ)
1245 USE_FOR_MMU(xformer = unpack_xz_stream;)
1246 USE_FOR_NOMMU(xformer_prog = "unxz";)
1247
1248 open_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
1249 /* Can't lseek over pipes */
1250 tar_handle->seek = seek_by_read;
1251 /*tar_handle->offset = 0; - already is */
1252 }
1253
1254 /* Zero processed headers (== empty file) is not a valid tarball.
1255 * We (ab)use bb_got_signal as exitcode here,
1256 * because check_errors_in_children() uses _it_ as error indicator.
1257 */
1258 bb_got_signal = EXIT_FAILURE;
1259
1260 while (get_header_tar(tar_handle) == EXIT_SUCCESS)
1261 bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
1262
1263 /* Check that every file that should have been extracted was */
1264 while (tar_handle->accept) {
1265 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
1266 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
1267 ) {
1268 bb_error_msg_and_die("%s: not found in archive",
1269 tar_handle->accept->data);
1270 }
1271 tar_handle->accept = tar_handle->accept->link;
1272 }
1273 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
1274 close(tar_handle->src_fd);
1275
1276 if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
1277 /* Set bb_got_signal to 1 if a child died with !0 exitcode */
1278 check_errors_in_children(0);
1279 }
1280
1281 return bb_got_signal;
1282}
1283
generated by cgit at 2024-05-15 02:40:58 (GMT)