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
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.
29 #include "unarchive.h"
31 /* FIXME: Stop using this non-standard feature */
32 #ifndef FNM_LEADING_DIR
33 #define FNM_LEADING_DIR 0
36 #define block_buf bb_common_bufsiz1
38 #if ENABLE_FEATURE_TAR_CREATE
40 /* Tar file constants */
42 #define TAR_BLOCK_SIZE 512
44 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
46 #define NAME_SIZE_STR "100"
47 typedef struct TarHeader TarHeader;
48 struct TarHeader { /* byte offset */
49 char name[NAME_SIZE]; /* 0-99 */
50 char mode[8]; /* 100-107 */
51 char uid[8]; /* 108-115 */
52 char gid[8]; /* 116-123 */
53 char size[12]; /* 124-135 */
54 char mtime[12]; /* 136-147 */
55 char chksum[8]; /* 148-155 */
56 char typeflag; /* 156-156 */
57 char linkname[NAME_SIZE]; /* 157-256 */
58 /* POSIX: "ustar" NUL "00" */
59 /* GNU tar: "ustar " NUL */
60 /* Normally it's defined as magic[6] followed by
61 * version[2], but we put them together to save code.
63 char magic[8]; /* 257-264 */
64 char uname[32]; /* 265-296 */
65 char gname[32]; /* 297-328 */
66 char devmajor[8]; /* 329-336 */
67 char devminor[8]; /* 337-344 */
68 char prefix[155]; /* 345-499 */
69 char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
73 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
74 ** the only functions that deal with the HardLinkInfo structure.
75 ** Even these functions use the xxxHardLinkInfo() functions.
77 typedef struct HardLinkInfo HardLinkInfo;
79 HardLinkInfo *next; /* Next entry in list */
80 dev_t dev; /* Device number */
81 ino_t ino; /* Inode number */
82 short linkCount; /* (Hard) Link Count */
83 char name[1]; /* Start of filename (must be last) */
86 /* Some info to be carried along when creating a new tarball */
87 typedef struct TarBallInfo TarBallInfo;
89 int tarFd; /* Open-for-write file descriptor
91 struct stat statBuf; /* Stat info for the tarball, letting
92 us know the inode and device that the
93 tarball lives, so we can avoid trying
94 to include the tarball into itself */
95 int verboseFlag; /* Whether to print extra stuff or not */
96 const llist_t *excludeList; /* List of files to not include */
97 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
98 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
101 /* A nice enum with all the possible tar file content types */
103 REGTYPE = '0', /* regular file */
104 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
105 LNKTYPE = '1', /* hard link */
106 SYMTYPE = '2', /* symbolic link */
107 CHRTYPE = '3', /* character special */
108 BLKTYPE = '4', /* block special */
109 DIRTYPE = '5', /* directory */
110 FIFOTYPE = '6', /* FIFO special */
111 CONTTYPE = '7', /* reserved */
112 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
113 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
115 typedef enum TarFileType TarFileType;
117 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
118 static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
119 struct stat *statbuf,
120 const char *fileName)
122 /* Note: hlInfoHeadPtr can never be NULL! */
123 HardLinkInfo *hlInfo;
125 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
126 hlInfo->next = *hlInfoHeadPtr;
127 *hlInfoHeadPtr = hlInfo;
128 hlInfo->dev = statbuf->st_dev;
129 hlInfo->ino = statbuf->st_ino;
130 hlInfo->linkCount = statbuf->st_nlink;
131 strcpy(hlInfo->name, fileName);
134 static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
136 HardLinkInfo *hlInfo;
137 HardLinkInfo *hlInfoNext;
140 hlInfo = *hlInfoHeadPtr;
142 hlInfoNext = hlInfo->next;
146 *hlInfoHeadPtr = NULL;
150 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
151 static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
154 if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
156 hlInfo = hlInfo->next;
161 /* Put an octal string into the specified buffer.
162 * The number is zero padded and possibly null terminated.
163 * Stores low-order bits only if whole value does not fit. */
164 static void putOctal(char *cp, int len, off_t value)
166 char tempBuffer[sizeof(off_t)*3+1];
167 char *tempString = tempBuffer;
170 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
171 tempString += (width - len);
173 /* If string has leading zeroes, we can drop one */
174 /* and field will have trailing '\0' */
175 /* (increases chances of compat with other tars) */
176 if (tempString[0] == '0')
179 /* Copy the string to the field */
180 memcpy(cp, tempString, len);
182 #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
184 static void chksum_and_xwrite(int fd, struct TarHeader* hp)
186 /* POSIX says that checksum is done on unsigned bytes
187 * (Sun and HP-UX gets it wrong... more details in
189 const unsigned char *cp;
192 strcpy(hp->magic, "ustar ");
194 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
195 * the header). The checksum field must be filled with blanks for the
196 * calculation. The checksum field is formatted differently from the
197 * other fields: it has 6 digits, a null, then a space -- rather than
198 * digits, followed by a null like the other fields... */
199 memset(hp->chksum, ' ', sizeof(hp->chksum));
200 cp = (const unsigned char *) hp;
203 do { chksum += *cp++; } while (--size);
204 putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
206 /* Now write the header out to disk */
207 xwrite(fd, hp, sizeof(*hp));
210 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
211 static void writeLongname(int fd, int type, const char *name, int dir)
213 static const struct {
214 char mode[8]; /* 100-107 */
215 char uid[8]; /* 108-115 */
216 char gid[8]; /* 116-123 */
217 char size[12]; /* 124-135 */
218 char mtime[12]; /* 136-147 */
226 struct TarHeader header;
229 dir = !!dir; /* normalize: 0/1 */
230 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
231 /* + dir: account for possible '/' */
233 memset(&header, 0, sizeof(header));
234 strcpy(header.name, "././@LongLink");
235 memcpy(header.mode, prefilled.mode, sizeof(prefilled));
236 PUT_OCTAL(header.size, size);
237 header.typeflag = type;
238 chksum_and_xwrite(fd, &header);
240 /* Write filename[/] and pad the block. */
241 /* dir=0: writes 'name<NUL>', pads */
242 /* dir=1: writes 'name', writes '/<NUL>', pads */
244 xwrite(fd, name, size - dir);
245 xwrite(fd, "/", dir);
246 size = (-size) & (TAR_BLOCK_SIZE-1);
247 memset(&header, 0, size);
248 xwrite(fd, &header, size);
252 /* Write out a tar header for the specified file/directory/whatever */
253 void BUG_tar_header_size(void);
254 static int writeTarHeader(struct TarBallInfo *tbInfo,
255 const char *header_name, const char *fileName, struct stat *statbuf)
257 struct TarHeader header;
259 if (sizeof(header) != 512)
260 BUG_tar_header_size();
262 memset(&header, 0, sizeof(struct TarHeader));
264 strncpy(header.name, header_name, sizeof(header.name));
266 /* POSIX says to mask mode with 07777. */
267 PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
268 PUT_OCTAL(header.uid, statbuf->st_uid);
269 PUT_OCTAL(header.gid, statbuf->st_gid);
270 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
271 PUT_OCTAL(header.mtime, statbuf->st_mtime);
273 /* Enter the user and group names */
274 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
275 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
277 if (tbInfo->hlInfo) {
278 /* This is a hard link */
279 header.typeflag = LNKTYPE;
280 strncpy(header.linkname, tbInfo->hlInfo->name,
281 sizeof(header.linkname));
282 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
283 /* Write out long linkname if needed */
284 if (header.linkname[sizeof(header.linkname)-1])
285 writeLongname(tbInfo->tarFd, GNULONGLINK,
286 tbInfo->hlInfo->name, 0);
288 } else if (S_ISLNK(statbuf->st_mode)) {
289 char *lpath = xmalloc_readlink_or_warn(fileName);
292 header.typeflag = SYMTYPE;
293 strncpy(header.linkname, lpath, sizeof(header.linkname));
294 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
295 /* Write out long linkname if needed */
296 if (header.linkname[sizeof(header.linkname)-1])
297 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
299 /* If it is larger than 100 bytes, bail out */
300 if (header.linkname[sizeof(header.linkname)-1]) {
302 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
307 } else if (S_ISDIR(statbuf->st_mode)) {
308 header.typeflag = DIRTYPE;
309 /* Append '/' only if there is a space for it */
310 if (!header.name[sizeof(header.name)-1])
311 header.name[strlen(header.name)] = '/';
312 } else if (S_ISCHR(statbuf->st_mode)) {
313 header.typeflag = CHRTYPE;
314 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
315 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
316 } else if (S_ISBLK(statbuf->st_mode)) {
317 header.typeflag = BLKTYPE;
318 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
319 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
320 } else if (S_ISFIFO(statbuf->st_mode)) {
321 header.typeflag = FIFOTYPE;
322 } else if (S_ISREG(statbuf->st_mode)) {
323 if (sizeof(statbuf->st_size) > 4
324 && statbuf->st_size > (off_t)0777777777777LL
326 bb_error_msg_and_die("cannot store file '%s' "
327 "of size %"OFF_FMT"d, aborting",
328 fileName, statbuf->st_size);
330 header.typeflag = REGTYPE;
331 PUT_OCTAL(header.size, statbuf->st_size);
333 bb_error_msg("%s: unknown file type", fileName);
337 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
338 /* Write out long name if needed */
339 /* (we, like GNU tar, output long linkname *before* long name) */
340 if (header.name[sizeof(header.name)-1])
341 writeLongname(tbInfo->tarFd, GNULONGNAME,
342 header_name, S_ISDIR(statbuf->st_mode));
345 /* Now write the header out to disk */
346 chksum_and_xwrite(tbInfo->tarFd, &header);
348 /* Now do the verbose thing (or not) */
349 if (tbInfo->verboseFlag) {
352 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
354 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
355 /* We don't have such excesses here: for us "v" == "vv" */
356 /* '/' is probably a GNUism */
357 fprintf(vbFd, "%s%s\n", header_name,
358 S_ISDIR(statbuf->st_mode) ? "/" : "");
364 #if ENABLE_FEATURE_TAR_FROM
365 static int exclude_file(const llist_t *excluded_files, const char *file)
367 while (excluded_files) {
368 if (excluded_files->data[0] == '/') {
369 if (fnmatch(excluded_files->data, file,
370 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
375 for (p = file; p[0] != '\0'; p++) {
376 if ((p == file || p[-1] == '/') && p[0] != '/' &&
377 fnmatch(excluded_files->data, p,
378 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
382 excluded_files = excluded_files->link;
388 #define exclude_file(excluded_files, file) 0
391 static int writeFileToTarball(const char *fileName, struct stat *statbuf,
392 void *userData, int depth ATTRIBUTE_UNUSED)
394 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
395 const char *header_name;
396 int inputFileFd = -1;
398 /* Strip leading '/' (must be before memorizing hardlink's name) */
399 header_name = fileName;
400 while (header_name[0] == '/') {
401 static smallint warned;
404 bb_error_msg("removing leading '/' from member names");
410 if (header_name[0] == '\0')
413 /* It is against the rules to archive a socket */
414 if (S_ISSOCK(statbuf->st_mode)) {
415 bb_error_msg("%s: socket ignored", fileName);
420 * Check to see if we are dealing with a hard link.
422 * Treat the first occurance of a given dev/inode as a file while
423 * treating any additional occurances as hard links. This is done
424 * by adding the file information to the HardLinkInfo linked list.
426 tbInfo->hlInfo = NULL;
427 if (statbuf->st_nlink > 1) {
428 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
429 if (tbInfo->hlInfo == NULL)
430 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
433 /* It is a bad idea to store the archive we are in the process of creating,
434 * so check the device and inode to be sure that this particular file isn't
436 if (tbInfo->statBuf.st_dev == statbuf->st_dev
437 && tbInfo->statBuf.st_ino == statbuf->st_ino
439 bb_error_msg("%s: file is the archive; skipping", fileName);
443 if (exclude_file(tbInfo->excludeList, header_name))
446 #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
447 if (strlen(header_name) >= NAME_SIZE) {
448 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
453 /* Is this a regular file? */
454 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
455 /* open the file we want to archive, and make sure all is well */
456 inputFileFd = open_or_warn(fileName, O_RDONLY);
457 if (inputFileFd < 0) {
462 /* Add an entry to the tarball */
463 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
467 /* If it was a regular file, write out the body */
468 if (inputFileFd >= 0) {
470 /* Write the file to the archive. */
471 /* We record size into header first, */
472 /* and then write out file. If file shrinks in between, */
473 /* tar will be corrupted. So we don't allow for that. */
474 /* NB: GNU tar 1.16 warns and pads with zeroes */
475 /* or even seeks back and updates header */
476 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
478 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
479 ////if (readSize != statbuf->st_size && readSize >= 0) {
480 //// bb_error_msg_and_die("short read from %s, aborting", fileName);
483 /* Check that file did not grow in between? */
484 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
488 /* Pad the file up to the tar block size */
489 /* (a few tricks here in the name of code size) */
490 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
491 memset(block_buf, 0, readSize);
492 xwrite(tbInfo->tarFd, block_buf, readSize);
498 static int writeTarFile(const int tar_fd, const int verboseFlag,
499 const unsigned long dereferenceFlag, const llist_t *include,
500 const llist_t *exclude, const int gzip)
503 int errorFlag = FALSE;
504 struct TarBallInfo tbInfo;
506 tbInfo.hlInfoHead = NULL;
508 fchmod(tar_fd, 0644);
509 tbInfo.tarFd = tar_fd;
510 tbInfo.verboseFlag = verboseFlag;
512 /* Store the stat info for the tarball's file, so
513 * can avoid including the tarball into itself.... */
514 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
515 bb_perror_msg_and_die("cannot stat tar file");
517 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
518 // On Linux, vfork never unpauses parent early, although standard
519 // allows for that. Do we want to waste bytes checking for it?
520 #define WAIT_FOR_CHILD 0
522 volatile int vfork_exec_errno = 0;
524 struct fd_pair gzipStatusPipe;
526 struct fd_pair gzipDataPipe;
527 const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
529 xpiped_pair(gzipDataPipe);
531 xpiped_pair(gzipStatusPipe);
534 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
536 #if defined(__GNUC__) && __GNUC__
537 /* Avoid vfork clobbering */
545 bb_perror_msg_and_die("vfork gzip");
549 /* NB: close _first_, then move fds! */
550 close(gzipDataPipe.wr);
552 close(gzipStatusPipe.rd);
553 /* gzipStatusPipe.wr will close only on exec -
554 * parent waits for this close to happen */
555 fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
557 xmove_fd(gzipDataPipe.rd, 0);
558 xmove_fd(tbInfo.tarFd, 1);
559 /* exec gzip/bzip2 program/applet */
560 BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
561 vfork_exec_errno = errno;
566 xmove_fd(gzipDataPipe.wr, tbInfo.tarFd);
567 close(gzipDataPipe.rd);
569 close(gzipStatusPipe.wr);
574 /* Wait until child execs (or fails to) */
575 n = full_read(gzipStatusPipe.rd, &buf, 1);
576 if (n < 0 /* && errno == EAGAIN */)
577 continue; /* try it again */
580 close(gzipStatusPipe.rd);
582 if (vfork_exec_errno) {
583 errno = vfork_exec_errno;
584 bb_perror_msg_and_die("cannot exec %s", zip_exec);
588 tbInfo.excludeList = exclude;
590 /* Read the directory/files and iterate over them one at a time */
592 if (!recursive_action(include->data, ACTION_RECURSE |
593 (dereferenceFlag ? ACTION_FOLLOWLINKS : 0),
594 writeFileToTarball, writeFileToTarball, &tbInfo, 0))
598 include = include->link;
600 /* Write two empty blocks to the end of the archive */
601 memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
602 xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
604 /* To be pedantically correct, we would check if the tarball
605 * is smaller than 20 tar blocks, and pad it if it was smaller,
606 * but that isn't necessary for GNU tar interoperability, and
607 * so is considered a waste of space */
609 /* Close so the child process (if any) will exit */
612 /* Hang up the tools, close up shop, head home */
613 if (ENABLE_FEATURE_CLEAN_UP)
614 freeHardLinkInfo(&tbInfo.hlInfoHead);
617 bb_error_msg("error exit delayed from previous errors");
621 if (safe_waitpid(gzipPid, &status, 0) == -1)
622 bb_perror_msg("waitpid");
623 else if (!WIFEXITED(status) || WEXITSTATUS(status))
624 /* gzip was killed or has exited with nonzero! */
630 int writeTarFile(const int tar_fd, const int verboseFlag,
631 const unsigned long dereferenceFlag, const llist_t *include,
632 const llist_t *exclude, const int gzip);
633 #endif /* FEATURE_TAR_CREATE */
635 #if ENABLE_FEATURE_TAR_FROM
636 static llist_t *append_file_list_to_list(llist_t *list)
642 llist_t *newlist = NULL;
645 src_stream = xfopen(cur->data, "r");
649 while ((line = xmalloc_getline(src_stream)) != NULL) {
650 /* kill trailing '/' unless the string is just "/" */
651 char *cp = last_char_is(line, '/');
654 llist_add_to(&newlist, line);
661 #define append_file_list_to_list(x) 0
664 #if ENABLE_FEATURE_TAR_COMPRESS
665 static char get_header_tar_Z(archive_handle_t *archive_handle)
667 /* Can't lseek over pipes */
668 archive_handle->seek = seek_by_read;
670 /* do the decompression, and cleanup */
671 if (xread_char(archive_handle->src_fd) != 0x1f
672 || xread_char(archive_handle->src_fd) != 0x9d
674 bb_error_msg_and_die("invalid magic");
677 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress");
678 archive_handle->offset = 0;
679 while (get_header_tar(archive_handle) == EXIT_SUCCESS)
682 /* Can only do one file at a time */
686 #define get_header_tar_Z NULL
689 #ifdef CHECK_FOR_CHILD_EXITCODE
690 /* Looks like it isn't needed - tar detects malformed (truncated)
691 * archive if e.g. bunzip2 fails */
692 static int child_error;
694 static void handle_SIGCHLD(int status)
696 /* Actually, 'status' is a signo. We reuse it for other needs */
698 /* Wait for any child without blocking */
699 if (wait_any_nohang(&status) < 0)
700 /* wait failed?! I'm confused... */
703 if (WIFEXITED(status) && WEXITSTATUS(status)==0)
704 /* child exited with 0 */
707 if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
714 USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
715 USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
716 USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,)
717 USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,)
718 USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
719 USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
720 USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,)
721 USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,)
722 OPTBIT_NOPRESERVE_OWN,
723 OPTBIT_NOPRESERVE_PERM,
724 OPT_TEST = 1 << 0, // t
725 OPT_EXTRACT = 1 << 1, // x
726 OPT_BASEDIR = 1 << 2, // C
727 OPT_TARNAME = 1 << 3, // f
728 OPT_2STDOUT = 1 << 4, // O
730 OPT_VERBOSE = 1 << 6, // v
731 OPT_KEEP_OLD = 1 << 7, // k
732 OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c
733 OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h
734 OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j
735 OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a
736 OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
737 OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
738 OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z
739 OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z
740 OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
741 OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
743 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
744 static const char tar_longopts[] ALIGN1 =
745 "list\0" No_argument "t"
746 "extract\0" No_argument "x"
747 "directory\0" Required_argument "C"
748 "file\0" Required_argument "f"
749 "to-stdout\0" No_argument "O"
750 "same-permissions\0" No_argument "p"
751 "verbose\0" No_argument "v"
752 "keep-old\0" No_argument "k"
753 # if ENABLE_FEATURE_TAR_CREATE
754 "create\0" No_argument "c"
755 "dereference\0" No_argument "h"
757 # if ENABLE_FEATURE_TAR_BZIP2
758 "bzip2\0" No_argument "j"
760 # if ENABLE_FEATURE_TAR_LZMA
761 "lzma\0" No_argument "a"
763 # if ENABLE_FEATURE_TAR_FROM
764 "files-from\0" Required_argument "T"
765 "exclude-from\0" Required_argument "X"
767 # if ENABLE_FEATURE_TAR_GZIP
768 "gzip\0" No_argument "z"
770 # if ENABLE_FEATURE_TAR_COMPRESS
771 "compress\0" No_argument "Z"
773 "no-same-owner\0" No_argument "\xfd"
774 "no-same-permissions\0" No_argument "\xfe"
775 /* --exclude takes next bit position in option mask, */
776 /* therefore we have to either put it _after_ --no-same-perm */
777 /* or add OPT[BIT]_EXCLUDE before OPT[BIT]_NOPRESERVE_OWN */
778 # if ENABLE_FEATURE_TAR_FROM
779 "exclude\0" Required_argument "\xff"
784 int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
785 int tar_main(int argc, char **argv)
787 char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
788 archive_handle_t *tar_handle;
789 char *base_dir = NULL;
790 const char *tar_filename = "-";
793 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
794 llist_t *excludes = NULL;
797 /* Initialise default values */
798 tar_handle = init_handle();
799 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS
800 | ARCHIVE_PRESERVE_DATE
801 | ARCHIVE_EXTRACT_UNCONDITIONAL;
803 /* Prepend '-' to the first argument if required */
804 opt_complementary = "--:" // first arg is options
805 "tt:vv:" // count -t,-v
806 "?:" // bail out with usage instead of error return
807 "X::T::" // cumulative lists
808 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
809 "\xff::" // cumulative lists for --exclude
811 USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
812 USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
813 SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
814 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
815 applet_long_options = tar_longopts;
819 USE_FEATURE_TAR_CREATE( "ch" )
820 USE_FEATURE_TAR_BZIP2( "j" )
821 USE_FEATURE_TAR_LZMA( "a" )
822 USE_FEATURE_TAR_FROM( "T:X:")
823 USE_FEATURE_TAR_GZIP( "z" )
824 USE_FEATURE_TAR_COMPRESS("Z" )
825 , &base_dir // -C dir
826 , &tar_filename // -f filename
827 USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
828 USE_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
829 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
830 , &excludes // --exclude
832 , &verboseFlag // combined count for -t and -v
833 , &verboseFlag // combined count for -t and -v
836 if (verboseFlag) tar_handle->action_header = header_verbose_list;
837 if (verboseFlag == 1) tar_handle->action_header = header_list;
839 if (opt & OPT_EXTRACT)
840 tar_handle->action_data = data_extract_all;
842 if (opt & OPT_2STDOUT)
843 tar_handle->action_data = data_extract_to_stdout;
845 if (opt & OPT_KEEP_OLD)
846 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
848 if (opt & OPT_NOPRESERVE_OWN)
849 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
851 if (opt & OPT_NOPRESERVE_PERM)
852 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
855 get_header_ptr = get_header_tar_gz;
858 get_header_ptr = get_header_tar_bz2;
861 get_header_ptr = get_header_tar_lzma;
863 if (opt & OPT_COMPRESS)
864 get_header_ptr = get_header_tar_Z;
866 #if ENABLE_FEATURE_TAR_FROM
867 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
868 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
869 /* Append excludes to reject */
871 llist_t *next = excludes->link;
872 excludes->link = tar_handle->reject;
873 tar_handle->reject = excludes;
877 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
880 /* Check if we are reading from stdin */
881 if (argv[optind] && *argv[optind] == '-') {
882 /* Default is to read from stdin, so just skip to next arg */
886 /* Setup an array of filenames to work with */
887 /* TODO: This is the same as in ar, separate function ? */
888 while (optind < argc) {
889 /* kill trailing '/' unless the string is just "/" */
890 char *cp = last_char_is(argv[optind], '/');
891 if (cp > argv[optind])
893 llist_add_to_end(&tar_handle->accept, argv[optind]);
897 if (tar_handle->accept || tar_handle->reject)
898 tar_handle->filter = filter_accept_reject_list;
900 /* Open the tar file */
905 if (opt & OPT_CREATE) {
906 /* Make sure there is at least one file to tar up. */
907 if (tar_handle->accept == NULL)
908 bb_error_msg_and_die("empty archive");
911 /* Mimicking GNU tar 1.15.1: */
912 flags = O_WRONLY|O_CREAT|O_TRUNC;
913 /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */
919 if (LONE_DASH(tar_filename)) {
920 tar_handle->src_fd = fileno(tar_stream);
921 tar_handle->seek = seek_by_read;
923 tar_handle->src_fd = xopen(tar_filename, flags);
930 #ifdef CHECK_FOR_CHILD_EXITCODE
931 /* We need to know whether child (gzip/bzip/etc) exits abnormally */
932 signal(SIGCHLD, handle_SIGCHLD);
935 /* create an archive */
936 if (opt & OPT_CREATE) {
938 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
940 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
942 /* NB: writeTarFile() closes tar_handle->src_fd */
943 return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
945 tar_handle->reject, zipMode);
948 while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
951 /* Check that every file that should have been extracted was */
952 while (tar_handle->accept) {
953 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
954 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
956 bb_error_msg_and_die("%s: not found in archive",
957 tar_handle->accept->data);
959 tar_handle->accept = tar_handle->accept->link;
961 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
962 close(tar_handle->src_fd);