1 /* vi: set sw=4 ts=4: */
3 * Mini tar implementation for busybox
5 * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
6 * Glenn McGrath <bug1@iinet.net.au>
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.)
12 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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.
20 * Based in part on the tar implementation from busybox-0.28
21 * Copyright (C) 1995 Bruce Perens
23 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
27 #include "unarchive.h"
31 #if ENABLE_FEATURE_TAR_CREATE
33 /* Tar file constants */
35 #define TAR_BLOCK_SIZE 512
37 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
39 #define NAME_SIZE_STR "100"
40 struct TarHeader { /* byte offset */
41 char name[NAME_SIZE]; /* 0-99 */
42 char mode[8]; /* 100-107 */
43 char uid[8]; /* 108-115 */
44 char gid[8]; /* 116-123 */
45 char size[12]; /* 124-135 */
46 char mtime[12]; /* 136-147 */
47 char chksum[8]; /* 148-155 */
48 char typeflag; /* 156-156 */
49 char linkname[NAME_SIZE]; /* 157-256 */
50 char magic[6]; /* 257-262 */
51 char version[2]; /* 263-264 */
52 char uname[32]; /* 265-296 */
53 char gname[32]; /* 297-328 */
54 char devmajor[8]; /* 329-336 */
55 char devminor[8]; /* 337-344 */
56 char prefix[155]; /* 345-499 */
57 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
59 typedef struct TarHeader TarHeader;
62 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
63 ** the only functions that deal with the HardLinkInfo structure.
64 ** Even these functions use the xxxHardLinkInfo() functions.
66 typedef struct HardLinkInfo HardLinkInfo;
68 HardLinkInfo *next; /* Next entry in list */
69 dev_t dev; /* Device number */
70 ino_t ino; /* Inode number */
71 short linkCount; /* (Hard) Link Count */
72 char name[1]; /* Start of filename (must be last) */
75 /* Some info to be carried along when creating a new tarball */
77 int tarFd; /* Open-for-write file descriptor
79 struct stat statBuf; /* Stat info for the tarball, letting
80 us know the inode and device that the
81 tarball lives, so we can avoid trying
82 to include the tarball into itself */
83 int verboseFlag; /* Whether to print extra stuff or not */
84 const llist_t *excludeList; /* List of files to not include */
85 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
86 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
88 typedef struct TarBallInfo TarBallInfo;
90 /* A nice enum with all the possible tar file content types */
92 REGTYPE = '0', /* regular file */
93 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
94 LNKTYPE = '1', /* hard link */
95 SYMTYPE = '2', /* symbolic link */
96 CHRTYPE = '3', /* character special */
97 BLKTYPE = '4', /* block special */
98 DIRTYPE = '5', /* directory */
99 FIFOTYPE = '6', /* FIFO special */
100 CONTTYPE = '7', /* reserved */
101 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
102 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
104 typedef enum TarFileType TarFileType;
106 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
107 static void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
108 struct stat *statbuf,
109 const char *fileName)
111 /* Note: hlInfoHeadPtr can never be NULL! */
112 HardLinkInfo *hlInfo;
114 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
115 hlInfo->next = *hlInfoHeadPtr;
116 *hlInfoHeadPtr = hlInfo;
117 hlInfo->dev = statbuf->st_dev;
118 hlInfo->ino = statbuf->st_ino;
119 hlInfo->linkCount = statbuf->st_nlink;
120 strcpy(hlInfo->name, fileName);
123 static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
125 HardLinkInfo *hlInfo;
126 HardLinkInfo *hlInfoNext;
129 hlInfo = *hlInfoHeadPtr;
131 hlInfoNext = hlInfo->next;
135 *hlInfoHeadPtr = NULL;
140 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
141 static HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf)
144 if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
146 hlInfo = hlInfo->next;
151 /* Put an octal string into the specified buffer.
152 * The number is zero padded and possibly null terminated.
153 * Stores low-order bits only if whole value does not fit. */
154 static void putOctal(char *cp, int len, off_t value)
156 char tempBuffer[sizeof(off_t)*3+1];
157 char *tempString = tempBuffer;
160 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
161 tempString += (width - len);
163 /* If string has leading zeroes, we can drop one */
164 /* and field will have trailing '\0' */
165 /* (increases chances of compat with other tars) */
166 if (tempString[0] == '0')
169 /* Copy the string to the field */
170 memcpy(cp, tempString, len);
172 #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
174 static void chksum_and_xwrite(int fd, struct TarHeader* hp)
176 const unsigned char *cp;
179 strcpy(hp->magic, "ustar ");
181 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
182 * the header). The checksum field must be filled with blanks for the
183 * calculation. The checksum field is formatted differently from the
184 * other fields: it has 6 digits, a null, then a space -- rather than
185 * digits, followed by a null like the other fields... */
186 memset(hp->chksum, ' ', sizeof(hp->chksum));
187 cp = (const unsigned char *) hp;
190 do { chksum += *cp++; } while (--size);
191 putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
193 /* Now write the header out to disk */
194 xwrite(fd, hp, sizeof(*hp));
197 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
198 static void writeLongname(int fd, int type, const char *name, int dir)
200 static const struct {
201 char mode[8]; /* 100-107 */
202 char uid[8]; /* 108-115 */
203 char gid[8]; /* 116-123 */
204 char size[12]; /* 124-135 */
205 char mtime[12]; /* 136-147 */
213 struct TarHeader header;
216 dir = !!dir; /* normalize: 0/1 */
217 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
218 /* + dir: account for possible '/' */
220 bzero(&header, sizeof(header));
221 strcpy(header.name, "././@LongLink");
222 memcpy(header.mode, prefilled.mode, sizeof(prefilled));
223 PUT_OCTAL(header.size, size);
224 header.typeflag = type;
225 chksum_and_xwrite(fd, &header);
227 /* Write filename[/] and pad the block. */
228 /* dir=0: writes 'name<NUL>', pads */
229 /* dir=1: writes 'name', writes '/<NUL>', pads */
231 xwrite(fd, name, size - dir);
232 xwrite(fd, "/", dir);
233 size = (-size) & (TAR_BLOCK_SIZE-1);
234 bzero(&header, size);
235 xwrite(fd, &header, size);
239 /* Write out a tar header for the specified file/directory/whatever */
240 void BUG_tar_header_size(void);
241 static int writeTarHeader(struct TarBallInfo *tbInfo,
242 const char *header_name, const char *fileName, struct stat *statbuf)
244 struct TarHeader header;
246 if (sizeof(header) != 512)
247 BUG_tar_header_size();
249 bzero(&header, sizeof(struct TarHeader));
251 strncpy(header.name, header_name, sizeof(header.name));
253 /* POSIX says to mask mode with 07777. */
254 PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
255 PUT_OCTAL(header.uid, statbuf->st_uid);
256 PUT_OCTAL(header.gid, statbuf->st_gid);
257 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
258 PUT_OCTAL(header.mtime, statbuf->st_mtime);
260 /* Enter the user and group names */
261 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
262 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
264 if (tbInfo->hlInfo) {
265 /* This is a hard link */
266 header.typeflag = LNKTYPE;
267 strncpy(header.linkname, tbInfo->hlInfo->name,
268 sizeof(header.linkname));
269 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
270 /* Write out long linkname if needed */
271 if (header.linkname[sizeof(header.linkname)-1])
272 writeLongname(tbInfo->tarFd, GNULONGLINK,
273 tbInfo->hlInfo->name, 0);
275 } else if (S_ISLNK(statbuf->st_mode)) {
276 char *lpath = xreadlink(fileName);
277 if (!lpath) /* Already printed err msg inside xreadlink() */
279 header.typeflag = SYMTYPE;
280 strncpy(header.linkname, lpath, sizeof(header.linkname));
281 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
282 /* Write out long linkname if needed */
283 if (header.linkname[sizeof(header.linkname)-1])
284 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
286 /* If it is larger than 100 bytes, bail out */
287 if (header.linkname[sizeof(header.linkname)-1]) {
289 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
294 } else if (S_ISDIR(statbuf->st_mode)) {
295 header.typeflag = DIRTYPE;
296 /* Append '/' only if there is a space for it */
297 if (!header.name[sizeof(header.name)-1])
298 header.name[strlen(header.name)] = '/';
299 } else if (S_ISCHR(statbuf->st_mode)) {
300 header.typeflag = CHRTYPE;
301 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
302 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
303 } else if (S_ISBLK(statbuf->st_mode)) {
304 header.typeflag = BLKTYPE;
305 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
306 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
307 } else if (S_ISFIFO(statbuf->st_mode)) {
308 header.typeflag = FIFOTYPE;
309 } else if (S_ISREG(statbuf->st_mode)) {
310 if (sizeof(statbuf->st_size) > 4
311 && statbuf->st_size > (off_t)0777777777777LL
313 bb_error_msg_and_die("cannot store file '%s' "
314 "of size %"OFF_FMT"d, aborting",
315 fileName, statbuf->st_size);
317 header.typeflag = REGTYPE;
318 PUT_OCTAL(header.size, statbuf->st_size);
320 bb_error_msg("%s: unknown file type", fileName);
324 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
325 /* Write out long name if needed */
326 /* (we, like GNU tar, output long linkname *before* long name) */
327 if (header.name[sizeof(header.name)-1])
328 writeLongname(tbInfo->tarFd, GNULONGNAME,
329 header_name, S_ISDIR(statbuf->st_mode));
332 /* Now write the header out to disk */
333 chksum_and_xwrite(tbInfo->tarFd, &header);
335 /* Now do the verbose thing (or not) */
336 if (tbInfo->verboseFlag) {
339 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
341 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
342 /* We don't have such excesses here: for us "v" == "vv" */
343 /* '/' is probably a GNUism */
344 fprintf(vbFd, "%s%s\n", header_name,
345 S_ISDIR(statbuf->st_mode) ? "/" : "");
351 # if ENABLE_FEATURE_TAR_FROM
352 static int exclude_file(const llist_t *excluded_files, const char *file)
354 while (excluded_files) {
355 if (excluded_files->data[0] == '/') {
356 if (fnmatch(excluded_files->data, file,
357 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
362 for (p = file; p[0] != '\0'; p++) {
363 if ((p == file || p[-1] == '/') && p[0] != '/' &&
364 fnmatch(excluded_files->data, p,
365 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
369 excluded_files = excluded_files->link;
375 #define exclude_file(excluded_files, file) 0
378 static int writeFileToTarball(const char *fileName, struct stat *statbuf,
379 void *userData, int depth)
381 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
382 const char *header_name;
383 int inputFileFd = -1;
386 * Check to see if we are dealing with a hard link.
388 * Treat the first occurance of a given dev/inode as a file while
389 * treating any additional occurances as hard links. This is done
390 * by adding the file information to the HardLinkInfo linked list.
392 tbInfo->hlInfo = NULL;
393 if (statbuf->st_nlink > 1) {
394 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
395 if (tbInfo->hlInfo == NULL)
396 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName);
399 /* It is against the rules to archive a socket */
400 if (S_ISSOCK(statbuf->st_mode)) {
401 bb_error_msg("%s: socket ignored", fileName);
405 /* It is a bad idea to store the archive we are in the process of creating,
406 * so check the device and inode to be sure that this particular file isn't
408 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
409 tbInfo->statBuf.st_ino == statbuf->st_ino) {
410 bb_error_msg("%s: file is the archive; skipping", fileName);
414 header_name = fileName;
415 while (header_name[0] == '/') {
416 static int alreadyWarned = FALSE;
418 if (alreadyWarned == FALSE) {
419 bb_error_msg("removing leading '/' from member names");
420 alreadyWarned = TRUE;
425 #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
426 if (strlen(fileName) >= NAME_SIZE) {
427 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
432 if (header_name[0] == '\0')
435 if (exclude_file(tbInfo->excludeList, header_name))
438 /* Is this a regular file? */
439 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
440 /* open the file we want to archive, and make sure all is well */
441 inputFileFd = open(fileName, O_RDONLY);
442 if (inputFileFd < 0) {
443 bb_perror_msg("%s: cannot open", fileName);
448 /* Add an entry to the tarball */
449 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
453 /* If it was a regular file, write out the body */
454 if (inputFileFd >= 0) {
457 /* write the file to the archive */
458 readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
459 /* readSize < 0 means that error was already reported */
460 if (readSize != statbuf->st_size && readSize >= 0) {
461 /* Deadly. We record size into header first, */
462 /* and then write out file. If file shrinks in between, */
463 /* tar will be corrupted. So bail out. */
464 /* NB: GNU tar 1.16 warns and pads with zeroes */
465 /* or even seeks back and updates header */
466 bb_error_msg_and_die("short read from %s, aborting", fileName);
468 /* Check that file did not grow in between? */
469 /* if (safe_read(inputFileFd,1) == 1) warn but continue? */
472 /* Pad the file up to the tar block size */
473 /* (a few tricks here in the name of code size) */
474 readSize = (-(int)readSize) & (TAR_BLOCK_SIZE-1);
475 bzero(bb_common_bufsiz1, readSize);
476 xwrite(tbInfo->tarFd, bb_common_bufsiz1, readSize);
482 static int writeTarFile(const int tar_fd, const int verboseFlag,
483 const unsigned long dereferenceFlag, const llist_t *include,
484 const llist_t *exclude, const int gzip)
487 int errorFlag = FALSE;
488 struct TarBallInfo tbInfo;
490 tbInfo.hlInfoHead = NULL;
492 fchmod(tar_fd, 0644);
493 tbInfo.tarFd = tar_fd;
494 tbInfo.verboseFlag = verboseFlag;
496 /* Store the stat info for the tarball's file, so
497 * can avoid including the tarball into itself.... */
498 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
499 bb_perror_msg_and_die("cannot stat tar file");
501 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
502 int gzipDataPipe[2] = { -1, -1 };
503 int gzipStatusPipe[2] = { -1, -1 };
504 volatile int vfork_exec_errno = 0;
505 char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
508 if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0)
509 bb_perror_msg_and_die("pipe");
511 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
514 /* Avoid vfork clobbering */
523 dup2(gzipDataPipe[0], 0);
524 close(gzipDataPipe[1]);
526 dup2(tbInfo.tarFd, 1);
528 close(gzipStatusPipe[0]);
529 fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */
531 execlp(zip_exec, zip_exec, "-f", NULL);
532 vfork_exec_errno = errno;
534 close(gzipStatusPipe[1]);
536 } else if (gzipPid > 0) {
537 close(gzipDataPipe[0]);
538 close(gzipStatusPipe[1]);
543 int n = full_read(gzipStatusPipe[0], &buf, 1);
545 if (n == 0 && vfork_exec_errno != 0) {
546 errno = vfork_exec_errno;
547 bb_perror_msg_and_die("cannot exec %s", zip_exec);
548 } else if ((n < 0) && (errno == EAGAIN || errno == EINTR))
549 continue; /* try it again */
552 close(gzipStatusPipe[0]);
554 tbInfo.tarFd = gzipDataPipe[1];
555 } else bb_perror_msg_and_die("vfork gzip");
558 tbInfo.excludeList = exclude;
560 /* Read the directory/files and iterate over them one at a time */
562 if (!recursive_action(include->data, TRUE, dereferenceFlag,
563 FALSE, writeFileToTarball, writeFileToTarball, &tbInfo, 0))
567 include = include->link;
569 /* Write two empty blocks to the end of the archive */
570 bzero(bb_common_bufsiz1, 2*TAR_BLOCK_SIZE);
571 xwrite(tbInfo.tarFd, bb_common_bufsiz1, 2*TAR_BLOCK_SIZE);
573 /* To be pedantically correct, we would check if the tarball
574 * is smaller than 20 tar blocks, and pad it if it was smaller,
575 * but that isn't necessary for GNU tar interoperability, and
576 * so is considered a waste of space */
578 /* Close so the child process (if any) will exit */
581 /* Hang up the tools, close up shop, head home */
582 if (ENABLE_FEATURE_CLEAN_UP)
583 freeHardLinkInfo(&tbInfo.hlInfoHead);
586 bb_error_msg("error exit delayed from previous errors");
588 if (gzipPid && waitpid(gzipPid, NULL, 0) == -1)
589 bb_error_msg("waitpid failed");
594 int writeTarFile(const int tar_fd, const int verboseFlag,
595 const unsigned long dereferenceFlag, const llist_t *include,
596 const llist_t *exclude, const int gzip);
597 #endif /* tar_create */
599 #if ENABLE_FEATURE_TAR_FROM
600 static llist_t *append_file_list_to_list(llist_t *list)
606 llist_t *newlist = NULL;
609 src_stream = xfopen(cur->data, "r");
613 while ((line = xmalloc_getline(src_stream)) != NULL) {
614 /* kill trailing '/' unless the string is just "/" */
615 char *cp = last_char_is(line, '/');
618 llist_add_to(&newlist, line);
625 #define append_file_list_to_list(x) 0
628 #if ENABLE_FEATURE_TAR_COMPRESS
629 static char get_header_tar_Z(archive_handle_t *archive_handle)
631 /* Can't lseek over pipes */
632 archive_handle->seek = seek_by_read;
634 /* do the decompression, and cleanup */
635 if (xread_char(archive_handle->src_fd) != 0x1f
636 || xread_char(archive_handle->src_fd) != 0x9d
638 bb_error_msg_and_die("invalid magic");
641 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress);
642 archive_handle->offset = 0;
643 while (get_header_tar(archive_handle) == EXIT_SUCCESS)
646 /* Can only do one file at a time */
650 #define get_header_tar_Z 0
655 USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
656 USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
657 USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,)
658 USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,)
659 USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
660 USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
661 USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,)
662 USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,)
663 OPTBIT_NOPRESERVE_OWN,
664 OPTBIT_NOPRESERVE_PERM,
665 OPT_TEST = 1 << 0, // t
666 OPT_EXTRACT = 1 << 1, // x
667 OPT_BASEDIR = 1 << 2, // C
668 OPT_TARNAME = 1 << 3, // f
669 OPT_2STDOUT = 1 << 4, // O
671 OPT_VERBOSE = 1 << 6, // v
672 OPT_KEEP_OLD = 1 << 7, // k
673 OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c
674 OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h
675 OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j
676 OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a
677 OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
678 OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
679 OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z
680 OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z
681 OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
682 OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
684 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
685 static const struct option tar_long_options[] = {
686 { "list", 0, NULL, 't' },
687 { "extract", 0, NULL, 'x' },
688 { "directory", 1, NULL, 'C' },
689 { "file", 1, NULL, 'f' },
690 { "to-stdout", 0, NULL, 'O' },
691 { "same-permissions", 0, NULL, 'p' },
692 { "verbose", 0, NULL, 'v' },
693 { "keep-old", 0, NULL, 'k' },
694 # if ENABLE_FEATURE_TAR_CREATE
695 { "create", 0, NULL, 'c' },
696 { "dereference", 0, NULL, 'h' },
698 # if ENABLE_FEATURE_TAR_BZIP2
699 { "bzip2", 0, NULL, 'j' },
701 # if ENABLE_FEATURE_TAR_LZMA
702 { "lzma", 0, NULL, 'a' },
704 # if ENABLE_FEATURE_TAR_FROM
705 { "files-from", 1, NULL, 'T' },
706 { "exclude-from", 1, NULL, 'X' },
707 { "exclude", 1, NULL, 0xfd },
709 # if ENABLE_FEATURE_TAR_GZIP
710 { "gzip", 0, NULL, 'z' },
712 # if ENABLE_FEATURE_TAR_COMPRESS
713 { "compress", 0, NULL, 'Z' },
715 { "no-same-owner", 0, NULL, 0xfe },
716 { "no-same-permissions",0, NULL, 0xff },
720 #define tar_long_options 0
723 int tar_main(int argc, char **argv)
725 char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
726 archive_handle_t *tar_handle;
727 char *base_dir = NULL;
728 const char *tar_filename = "-";
731 llist_t *excludes = NULL;
733 /* Initialise default values */
734 tar_handle = init_handle();
735 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS
736 | ARCHIVE_PRESERVE_DATE
737 | ARCHIVE_EXTRACT_UNCONDITIONAL;
739 /* Prepend '-' to the first argument if required */
740 opt_complementary = "--:" // first arg is options
741 "tt:vv:" // count -t,-v
742 "?:" // bail out with usage instead of error return
743 "X::T::" // cumulative lists
744 "\xfd::" // cumulative lists for --exclude
745 USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
746 USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
747 SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
748 if (ENABLE_FEATURE_TAR_LONG_OPTIONS)
749 applet_long_options = tar_long_options;
750 opt = getopt32(argc, argv,
752 USE_FEATURE_TAR_CREATE( "ch" )
753 USE_FEATURE_TAR_BZIP2( "j" )
754 USE_FEATURE_TAR_LZMA( "a" )
755 USE_FEATURE_TAR_FROM( "T:X:")
756 USE_FEATURE_TAR_GZIP( "z" )
757 USE_FEATURE_TAR_COMPRESS("Z" )
760 &tar_filename, // -f filename
761 USE_FEATURE_TAR_FROM(&(tar_handle->accept),) // T
762 USE_FEATURE_TAR_FROM(&(tar_handle->reject),) // X
763 USE_FEATURE_TAR_FROM(&excludes ,) // --exclude
764 &verboseFlag, // combined count for -t and -v
765 &verboseFlag // combined count for -t and -v
768 if (verboseFlag) tar_handle->action_header = header_verbose_list;
769 if (verboseFlag == 1) tar_handle->action_header = header_list;
771 if (opt & OPT_EXTRACT)
772 tar_handle->action_data = data_extract_all;
774 if (opt & OPT_2STDOUT)
775 tar_handle->action_data = data_extract_to_stdout;
777 if (opt & OPT_KEEP_OLD)
778 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
780 if (opt & OPT_NOPRESERVE_OWN)
781 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
783 if (opt & OPT_NOPRESERVE_PERM)
784 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
787 get_header_ptr = get_header_tar_gz;
790 get_header_ptr = get_header_tar_bz2;
793 get_header_ptr = get_header_tar_lzma;
795 if (opt & OPT_COMPRESS)
796 get_header_ptr = get_header_tar_Z;
798 if (ENABLE_FEATURE_TAR_FROM) {
799 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
800 /* Append excludes to reject */
802 llist_t *temp = excludes->link;
803 excludes->link = tar_handle->reject;
804 tar_handle->reject = excludes;
807 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
810 /* Check if we are reading from stdin */
811 if (argv[optind] && *argv[optind] == '-') {
812 /* Default is to read from stdin, so just skip to next arg */
816 /* Setup an array of filenames to work with */
817 /* TODO: This is the same as in ar, separate function ? */
818 while (optind < argc) {
819 /* kill trailing '/' unless the string is just "/" */
820 char *cp = last_char_is(argv[optind], '/');
821 if (cp > argv[optind])
823 llist_add_to(&tar_handle->accept, argv[optind]);
826 tar_handle->accept = rev_llist(tar_handle->accept);
828 if (tar_handle->accept || tar_handle->reject)
829 tar_handle->filter = filter_accept_reject_list;
831 /* Open the tar file */
836 if (opt & OPT_CREATE) {
837 /* Make sure there is at least one file to tar up. */
838 if (tar_handle->accept == NULL)
839 bb_error_msg_and_die("empty archive");
842 /* Mimicking GNU tar 1.15.1: */
843 flags = O_WRONLY|O_CREAT|O_TRUNC;
844 /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */
850 if (tar_filename[0] == '-' && !tar_filename[1]) {
851 tar_handle->src_fd = fileno(tar_stream);
852 tar_handle->seek = seek_by_read;
854 tar_handle->src_fd = xopen(tar_filename, flags);
861 /* create an archive */
862 if (opt & OPT_CREATE) {
864 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
866 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
868 writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
870 tar_handle->reject, zipMode);
871 /* NB: writeTarFile() closes tar_handle->src_fd */
875 while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
878 /* Check that every file that should have been extracted was */
879 while (tar_handle->accept) {
880 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
881 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
883 bb_error_msg_and_die("%s: not found in archive",
884 tar_handle->accept->data);
886 tar_handle->accept = tar_handle->accept->link;
888 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
889 close(tar_handle->src_fd);