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 #define block_buf bb_common_bufsiz1
33 #if ENABLE_FEATURE_TAR_CREATE
35 /* Tar file constants */
37 #define TAR_BLOCK_SIZE 512
39 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
41 #define NAME_SIZE_STR "100"
42 typedef struct TarHeader TarHeader;
43 struct TarHeader { /* byte offset */
44 char name[NAME_SIZE]; /* 0-99 */
45 char mode[8]; /* 100-107 */
46 char uid[8]; /* 108-115 */
47 char gid[8]; /* 116-123 */
48 char size[12]; /* 124-135 */
49 char mtime[12]; /* 136-147 */
50 char chksum[8]; /* 148-155 */
51 char typeflag; /* 156-156 */
52 char linkname[NAME_SIZE]; /* 157-256 */
53 char magic[6]; /* 257-262 */
54 char version[2]; /* 263-264 */
55 char uname[32]; /* 265-296 */
56 char gname[32]; /* 297-328 */
57 char devmajor[8]; /* 329-336 */
58 char devminor[8]; /* 337-344 */
59 char prefix[155]; /* 345-499 */
60 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
64 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
65 ** the only functions that deal with the HardLinkInfo structure.
66 ** Even these functions use the xxxHardLinkInfo() functions.
68 typedef struct HardLinkInfo HardLinkInfo;
70 HardLinkInfo *next; /* Next entry in list */
71 dev_t dev; /* Device number */
72 ino_t ino; /* Inode number */
73 short linkCount; /* (Hard) Link Count */
74 char name[1]; /* Start of filename (must be last) */
77 /* Some info to be carried along when creating a new tarball */
78 typedef struct TarBallInfo TarBallInfo;
80 int tarFd; /* Open-for-write file descriptor
82 struct stat statBuf; /* Stat info for the tarball, letting
83 us know the inode and device that the
84 tarball lives, so we can avoid trying
85 to include the tarball into itself */
86 int verboseFlag; /* Whether to print extra stuff or not */
87 const llist_t *excludeList; /* List of files to not include */
88 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
89 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
92 /* A nice enum with all the possible tar file content types */
94 REGTYPE = '0', /* regular file */
95 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
96 LNKTYPE = '1', /* hard link */
97 SYMTYPE = '2', /* symbolic link */
98 CHRTYPE = '3', /* character special */
99 BLKTYPE = '4', /* block special */
100 DIRTYPE = '5', /* directory */
101 FIFOTYPE = '6', /* FIFO special */
102 CONTTYPE = '7', /* reserved */
103 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
104 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
106 typedef enum TarFileType TarFileType;
108 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
109 static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
110 struct stat *statbuf,
111 const char *fileName)
113 /* Note: hlInfoHeadPtr can never be NULL! */
114 HardLinkInfo *hlInfo;
116 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
117 hlInfo->next = *hlInfoHeadPtr;
118 *hlInfoHeadPtr = hlInfo;
119 hlInfo->dev = statbuf->st_dev;
120 hlInfo->ino = statbuf->st_ino;
121 hlInfo->linkCount = statbuf->st_nlink;
122 strcpy(hlInfo->name, fileName);
125 static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
127 HardLinkInfo *hlInfo;
128 HardLinkInfo *hlInfoNext;
131 hlInfo = *hlInfoHeadPtr;
133 hlInfoNext = hlInfo->next;
137 *hlInfoHeadPtr = NULL;
141 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
142 static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
145 if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
147 hlInfo = hlInfo->next;
152 /* Put an octal string into the specified buffer.
153 * The number is zero padded and possibly null terminated.
154 * Stores low-order bits only if whole value does not fit. */
155 static void putOctal(char *cp, int len, off_t value)
157 char tempBuffer[sizeof(off_t)*3+1];
158 char *tempString = tempBuffer;
161 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
162 tempString += (width - len);
164 /* If string has leading zeroes, we can drop one */
165 /* and field will have trailing '\0' */
166 /* (increases chances of compat with other tars) */
167 if (tempString[0] == '0')
170 /* Copy the string to the field */
171 memcpy(cp, tempString, len);
173 #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
175 static void chksum_and_xwrite(int fd, struct TarHeader* hp)
177 /* POSIX says that checksum is done on unsigned bytes
178 * (Sun and HP-UX gets it wrong... more details in
180 const unsigned char *cp;
183 strcpy(hp->magic, "ustar ");
185 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
186 * the header). The checksum field must be filled with blanks for the
187 * calculation. The checksum field is formatted differently from the
188 * other fields: it has 6 digits, a null, then a space -- rather than
189 * digits, followed by a null like the other fields... */
190 memset(hp->chksum, ' ', sizeof(hp->chksum));
191 cp = (const unsigned char *) hp;
194 do { chksum += *cp++; } while (--size);
195 putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
197 /* Now write the header out to disk */
198 xwrite(fd, hp, sizeof(*hp));
201 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
202 static void writeLongname(int fd, int type, const char *name, int dir)
204 static const struct {
205 char mode[8]; /* 100-107 */
206 char uid[8]; /* 108-115 */
207 char gid[8]; /* 116-123 */
208 char size[12]; /* 124-135 */
209 char mtime[12]; /* 136-147 */
217 struct TarHeader header;
220 dir = !!dir; /* normalize: 0/1 */
221 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
222 /* + dir: account for possible '/' */
224 memset(&header, 0, sizeof(header));
225 strcpy(header.name, "././@LongLink");
226 memcpy(header.mode, prefilled.mode, sizeof(prefilled));
227 PUT_OCTAL(header.size, size);
228 header.typeflag = type;
229 chksum_and_xwrite(fd, &header);
231 /* Write filename[/] and pad the block. */
232 /* dir=0: writes 'name<NUL>', pads */
233 /* dir=1: writes 'name', writes '/<NUL>', pads */
235 xwrite(fd, name, size - dir);
236 xwrite(fd, "/", dir);
237 size = (-size) & (TAR_BLOCK_SIZE-1);
238 memset(&header, 0, size);
239 xwrite(fd, &header, size);
243 /* Write out a tar header for the specified file/directory/whatever */
244 void BUG_tar_header_size(void);
245 static int writeTarHeader(struct TarBallInfo *tbInfo,
246 const char *header_name, const char *fileName, struct stat *statbuf)
248 struct TarHeader header;
250 if (sizeof(header) != 512)
251 BUG_tar_header_size();
253 memset(&header, 0, sizeof(struct TarHeader));
255 strncpy(header.name, header_name, sizeof(header.name));
257 /* POSIX says to mask mode with 07777. */
258 PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
259 PUT_OCTAL(header.uid, statbuf->st_uid);
260 PUT_OCTAL(header.gid, statbuf->st_gid);
261 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
262 PUT_OCTAL(header.mtime, statbuf->st_mtime);
264 /* Enter the user and group names */
265 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
266 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
268 if (tbInfo->hlInfo) {
269 /* This is a hard link */
270 header.typeflag = LNKTYPE;
271 strncpy(header.linkname, tbInfo->hlInfo->name,
272 sizeof(header.linkname));
273 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
274 /* Write out long linkname if needed */
275 if (header.linkname[sizeof(header.linkname)-1])
276 writeLongname(tbInfo->tarFd, GNULONGLINK,
277 tbInfo->hlInfo->name, 0);
279 } else if (S_ISLNK(statbuf->st_mode)) {
280 char *lpath = xmalloc_readlink_or_warn(fileName);
283 header.typeflag = SYMTYPE;
284 strncpy(header.linkname, lpath, sizeof(header.linkname));
285 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
286 /* Write out long linkname if needed */
287 if (header.linkname[sizeof(header.linkname)-1])
288 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
290 /* If it is larger than 100 bytes, bail out */
291 if (header.linkname[sizeof(header.linkname)-1]) {
293 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
298 } else if (S_ISDIR(statbuf->st_mode)) {
299 header.typeflag = DIRTYPE;
300 /* Append '/' only if there is a space for it */
301 if (!header.name[sizeof(header.name)-1])
302 header.name[strlen(header.name)] = '/';
303 } else if (S_ISCHR(statbuf->st_mode)) {
304 header.typeflag = CHRTYPE;
305 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
306 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
307 } else if (S_ISBLK(statbuf->st_mode)) {
308 header.typeflag = BLKTYPE;
309 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
310 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
311 } else if (S_ISFIFO(statbuf->st_mode)) {
312 header.typeflag = FIFOTYPE;
313 } else if (S_ISREG(statbuf->st_mode)) {
314 if (sizeof(statbuf->st_size) > 4
315 && statbuf->st_size > (off_t)0777777777777LL
317 bb_error_msg_and_die("cannot store file '%s' "
318 "of size %"OFF_FMT"d, aborting",
319 fileName, statbuf->st_size);
321 header.typeflag = REGTYPE;
322 PUT_OCTAL(header.size, statbuf->st_size);
324 bb_error_msg("%s: unknown file type", fileName);
328 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
329 /* Write out long name if needed */
330 /* (we, like GNU tar, output long linkname *before* long name) */
331 if (header.name[sizeof(header.name)-1])
332 writeLongname(tbInfo->tarFd, GNULONGNAME,
333 header_name, S_ISDIR(statbuf->st_mode));
336 /* Now write the header out to disk */
337 chksum_and_xwrite(tbInfo->tarFd, &header);
339 /* Now do the verbose thing (or not) */
340 if (tbInfo->verboseFlag) {
343 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
345 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
346 /* We don't have such excesses here: for us "v" == "vv" */
347 /* '/' is probably a GNUism */
348 fprintf(vbFd, "%s%s\n", header_name,
349 S_ISDIR(statbuf->st_mode) ? "/" : "");
355 #if ENABLE_FEATURE_TAR_FROM
356 static int exclude_file(const llist_t *excluded_files, const char *file)
358 while (excluded_files) {
359 if (excluded_files->data[0] == '/') {
360 if (fnmatch(excluded_files->data, file,
361 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
366 for (p = file; p[0] != '\0'; p++) {
367 if ((p == file || p[-1] == '/') && p[0] != '/' &&
368 fnmatch(excluded_files->data, p,
369 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
373 excluded_files = excluded_files->link;
379 #define exclude_file(excluded_files, file) 0
382 static int writeFileToTarball(const char *fileName, struct stat *statbuf,
383 void *userData, int depth ATTRIBUTE_UNUSED)
385 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
386 const char *header_name;
387 int inputFileFd = -1;
389 /* Strip leading '/' (must be before memorizing hardlink's name) */
390 header_name = fileName;
391 while (header_name[0] == '/') {
392 static smallint warned;
395 bb_error_msg("removing leading '/' from member names");
401 if (header_name[0] == '\0')
404 /* It is against the rules to archive a socket */
405 if (S_ISSOCK(statbuf->st_mode)) {
406 bb_error_msg("%s: socket ignored", fileName);
411 * Check to see if we are dealing with a hard link.
413 * Treat the first occurance of a given dev/inode as a file while
414 * treating any additional occurances as hard links. This is done
415 * by adding the file information to the HardLinkInfo linked list.
417 tbInfo->hlInfo = NULL;
418 if (statbuf->st_nlink > 1) {
419 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
420 if (tbInfo->hlInfo == NULL)
421 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
424 /* It is a bad idea to store the archive we are in the process of creating,
425 * so check the device and inode to be sure that this particular file isn't
427 if (tbInfo->statBuf.st_dev == statbuf->st_dev
428 && tbInfo->statBuf.st_ino == statbuf->st_ino
430 bb_error_msg("%s: file is the archive; skipping", fileName);
434 if (exclude_file(tbInfo->excludeList, header_name))
437 #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
438 if (strlen(header_name) >= NAME_SIZE) {
439 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
444 /* Is this a regular file? */
445 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
446 /* open the file we want to archive, and make sure all is well */
447 inputFileFd = open_or_warn(fileName, O_RDONLY);
448 if (inputFileFd < 0) {
453 /* Add an entry to the tarball */
454 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
458 /* If it was a regular file, write out the body */
459 if (inputFileFd >= 0) {
461 /* Write the file to the archive. */
462 /* We record size into header first, */
463 /* and then write out file. If file shrinks in between, */
464 /* tar will be corrupted. So we don't allow for that. */
465 /* NB: GNU tar 1.16 warns and pads with zeroes */
466 /* or even seeks back and updates header */
467 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
469 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
470 ////if (readSize != statbuf->st_size && readSize >= 0) {
471 //// bb_error_msg_and_die("short read from %s, aborting", fileName);
474 /* Check that file did not grow in between? */
475 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
479 /* Pad the file up to the tar block size */
480 /* (a few tricks here in the name of code size) */
481 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
482 memset(block_buf, 0, readSize);
483 xwrite(tbInfo->tarFd, block_buf, readSize);
489 static int writeTarFile(const int tar_fd, const int verboseFlag,
490 const unsigned long dereferenceFlag, const llist_t *include,
491 const llist_t *exclude, const int gzip)
494 int errorFlag = FALSE;
495 struct TarBallInfo tbInfo;
497 tbInfo.hlInfoHead = NULL;
499 fchmod(tar_fd, 0644);
500 tbInfo.tarFd = tar_fd;
501 tbInfo.verboseFlag = verboseFlag;
503 /* Store the stat info for the tarball's file, so
504 * can avoid including the tarball into itself.... */
505 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
506 bb_perror_msg_and_die("cannot stat tar file");
508 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
509 // On Linux, vfork never unpauses parent early, although standard
510 // allows for that. Do we want to waste bytes checking for it?
511 #define WAIT_FOR_CHILD 0
513 volatile int vfork_exec_errno = 0;
515 struct { int rd; int wr; } gzipStatusPipe;
517 struct { int rd; int wr; } gzipDataPipe;
518 const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
520 xpipe(&gzipDataPipe.rd);
522 xpipe(&gzipStatusPipe.rd);
525 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
527 #if defined(__GNUC__) && __GNUC__
528 /* Avoid vfork clobbering */
536 bb_perror_msg_and_die("vfork gzip");
540 xmove_fd(tbInfo.tarFd, 1);
541 xmove_fd(gzipDataPipe.rd, 0);
542 close(gzipDataPipe.wr);
544 close(gzipStatusPipe.rd);
545 fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
547 /* exec gzip/bzip2 program/applet */
548 BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
549 vfork_exec_errno = errno;
554 xmove_fd(gzipDataPipe.wr, tbInfo.tarFd);
555 close(gzipDataPipe.rd);
557 close(gzipStatusPipe.wr);
562 /* Wait until child execs (or fails to) */
563 n = full_read(gzipStatusPipe.rd, &buf, 1);
564 if ((n < 0) && (/*errno == EAGAIN ||*/ errno == EINTR))
565 continue; /* try it again */
568 close(gzipStatusPipe.rd);
570 if (vfork_exec_errno) {
571 errno = vfork_exec_errno;
572 bb_perror_msg_and_die("cannot exec %s", zip_exec);
576 tbInfo.excludeList = exclude;
578 /* Read the directory/files and iterate over them one at a time */
580 if (!recursive_action(include->data, ACTION_RECURSE |
581 (dereferenceFlag ? ACTION_FOLLOWLINKS : 0),
582 writeFileToTarball, writeFileToTarball, &tbInfo, 0))
586 include = include->link;
588 /* Write two empty blocks to the end of the archive */
589 memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
590 xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
592 /* To be pedantically correct, we would check if the tarball
593 * is smaller than 20 tar blocks, and pad it if it was smaller,
594 * but that isn't necessary for GNU tar interoperability, and
595 * so is considered a waste of space */
597 /* Close so the child process (if any) will exit */
600 /* Hang up the tools, close up shop, head home */
601 if (ENABLE_FEATURE_CLEAN_UP)
602 freeHardLinkInfo(&tbInfo.hlInfoHead);
605 bb_error_msg("error exit delayed from previous errors");
609 if (waitpid(gzipPid, &status, 0) == -1)
610 bb_perror_msg("waitpid");
611 else if (!WIFEXITED(status) || WEXITSTATUS(status))
612 /* gzip was killed or has exited with nonzero! */
618 int writeTarFile(const int tar_fd, const int verboseFlag,
619 const unsigned long dereferenceFlag, const llist_t *include,
620 const llist_t *exclude, const int gzip);
621 #endif /* FEATURE_TAR_CREATE */
623 #if ENABLE_FEATURE_TAR_FROM
624 static llist_t *append_file_list_to_list(llist_t *list)
630 llist_t *newlist = NULL;
633 src_stream = xfopen(cur->data, "r");
637 while ((line = xmalloc_getline(src_stream)) != NULL) {
638 /* kill trailing '/' unless the string is just "/" */
639 char *cp = last_char_is(line, '/');
642 llist_add_to(&newlist, line);
649 #define append_file_list_to_list(x) 0
652 #if ENABLE_FEATURE_TAR_COMPRESS
653 static char get_header_tar_Z(archive_handle_t *archive_handle)
655 /* Can't lseek over pipes */
656 archive_handle->seek = seek_by_read;
658 /* do the decompression, and cleanup */
659 if (xread_char(archive_handle->src_fd) != 0x1f
660 || xread_char(archive_handle->src_fd) != 0x9d
662 bb_error_msg_and_die("invalid magic");
665 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress", "uncompress", "-cf", "-", NULL);
666 archive_handle->offset = 0;
667 while (get_header_tar(archive_handle) == EXIT_SUCCESS)
670 /* Can only do one file at a time */
674 #define get_header_tar_Z NULL
677 #ifdef CHECK_FOR_CHILD_EXITCODE
678 /* Looks like it isn't needed - tar detects malformed (truncated)
679 * archive if e.g. bunzip2 fails */
680 static int child_error;
682 static void handle_SIGCHLD(int status)
684 /* Actually, 'status' is a signo. We reuse it for other needs */
686 /* Wait for any child without blocking */
687 if (waitpid(-1, &status, WNOHANG) < 0)
688 /* wait failed?! I'm confused... */
691 if (WIFEXITED(status) && WEXITSTATUS(status)==0)
692 /* child exited with 0 */
695 if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
702 USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
703 USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
704 USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,)
705 USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,)
706 USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
707 USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
708 USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,)
709 USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,)
710 OPTBIT_NOPRESERVE_OWN,
711 OPTBIT_NOPRESERVE_PERM,
712 OPT_TEST = 1 << 0, // t
713 OPT_EXTRACT = 1 << 1, // x
714 OPT_BASEDIR = 1 << 2, // C
715 OPT_TARNAME = 1 << 3, // f
716 OPT_2STDOUT = 1 << 4, // O
718 OPT_VERBOSE = 1 << 6, // v
719 OPT_KEEP_OLD = 1 << 7, // k
720 OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c
721 OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h
722 OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j
723 OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a
724 OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
725 OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
726 OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z
727 OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z
728 OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
729 OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
731 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
732 static const char tar_longopts[] ALIGN1 =
733 "list\0" No_argument "t"
734 "extract\0" No_argument "x"
735 "directory\0" Required_argument "C"
736 "file\0" Required_argument "f"
737 "to-stdout\0" No_argument "O"
738 "same-permissions\0" No_argument "p"
739 "verbose\0" No_argument "v"
740 "keep-old\0" No_argument "k"
741 # if ENABLE_FEATURE_TAR_CREATE
742 "create\0" No_argument "c"
743 "dereference\0" No_argument "h"
745 # if ENABLE_FEATURE_TAR_BZIP2
746 "bzip2\0" No_argument "j"
748 # if ENABLE_FEATURE_TAR_LZMA
749 "lzma\0" No_argument "a"
751 # if ENABLE_FEATURE_TAR_FROM
752 "files-from\0" Required_argument "T"
753 "exclude-from\0" Required_argument "X"
755 # if ENABLE_FEATURE_TAR_GZIP
756 "gzip\0" No_argument "z"
758 # if ENABLE_FEATURE_TAR_COMPRESS
759 "compress\0" No_argument "Z"
761 "no-same-owner\0" No_argument "\xfd"
762 "no-same-permissions\0" No_argument "\xfe"
763 /* --exclude takes next bit position in option mask, */
764 /* therefore we have to either put it _after_ --no-same-perm */
765 /* or add OPT[BIT]_EXCLUDE before OPT[BIT]_NOPRESERVE_OWN */
766 # if ENABLE_FEATURE_TAR_FROM
767 "exclude\0" Required_argument "\xff"
772 int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
773 int tar_main(int argc, char **argv)
775 char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
776 archive_handle_t *tar_handle;
777 char *base_dir = NULL;
778 const char *tar_filename = "-";
781 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
782 llist_t *excludes = NULL;
785 /* Initialise default values */
786 tar_handle = init_handle();
787 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS
788 | ARCHIVE_PRESERVE_DATE
789 | ARCHIVE_EXTRACT_UNCONDITIONAL;
791 /* Prepend '-' to the first argument if required */
792 opt_complementary = "--:" // first arg is options
793 "tt:vv:" // count -t,-v
794 "?:" // bail out with usage instead of error return
795 "X::T::" // cumulative lists
796 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
797 "\xff::" // cumulative lists for --exclude
799 USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
800 USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
801 SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
802 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
803 applet_long_options = tar_longopts;
807 USE_FEATURE_TAR_CREATE( "ch" )
808 USE_FEATURE_TAR_BZIP2( "j" )
809 USE_FEATURE_TAR_LZMA( "a" )
810 USE_FEATURE_TAR_FROM( "T:X:")
811 USE_FEATURE_TAR_GZIP( "z" )
812 USE_FEATURE_TAR_COMPRESS("Z" )
813 , &base_dir // -C dir
814 , &tar_filename // -f filename
815 USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
816 USE_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
817 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
818 , &excludes // --exclude
820 , &verboseFlag // combined count for -t and -v
821 , &verboseFlag // combined count for -t and -v
824 if (verboseFlag) tar_handle->action_header = header_verbose_list;
825 if (verboseFlag == 1) tar_handle->action_header = header_list;
827 if (opt & OPT_EXTRACT)
828 tar_handle->action_data = data_extract_all;
830 if (opt & OPT_2STDOUT)
831 tar_handle->action_data = data_extract_to_stdout;
833 if (opt & OPT_KEEP_OLD)
834 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
836 if (opt & OPT_NOPRESERVE_OWN)
837 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
839 if (opt & OPT_NOPRESERVE_PERM)
840 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
843 get_header_ptr = get_header_tar_gz;
846 get_header_ptr = get_header_tar_bz2;
849 get_header_ptr = get_header_tar_lzma;
851 if (opt & OPT_COMPRESS)
852 get_header_ptr = get_header_tar_Z;
854 #if ENABLE_FEATURE_TAR_FROM
855 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
856 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
857 /* Append excludes to reject */
859 llist_t *next = excludes->link;
860 excludes->link = tar_handle->reject;
861 tar_handle->reject = excludes;
865 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
868 /* Check if we are reading from stdin */
869 if (argv[optind] && *argv[optind] == '-') {
870 /* Default is to read from stdin, so just skip to next arg */
874 /* Setup an array of filenames to work with */
875 /* TODO: This is the same as in ar, separate function ? */
876 while (optind < argc) {
877 /* kill trailing '/' unless the string is just "/" */
878 char *cp = last_char_is(argv[optind], '/');
879 if (cp > argv[optind])
881 llist_add_to_end(&tar_handle->accept, argv[optind]);
885 if (tar_handle->accept || tar_handle->reject)
886 tar_handle->filter = filter_accept_reject_list;
888 /* Open the tar file */
893 if (opt & OPT_CREATE) {
894 /* Make sure there is at least one file to tar up. */
895 if (tar_handle->accept == NULL)
896 bb_error_msg_and_die("empty archive");
899 /* Mimicking GNU tar 1.15.1: */
900 flags = O_WRONLY|O_CREAT|O_TRUNC;
901 /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */
907 if (LONE_DASH(tar_filename)) {
908 tar_handle->src_fd = fileno(tar_stream);
909 tar_handle->seek = seek_by_read;
911 tar_handle->src_fd = xopen(tar_filename, flags);
918 #ifdef CHECK_FOR_CHILD_EXITCODE
919 /* We need to know whether child (gzip/bzip/etc) exits abnormally */
920 signal(SIGCHLD, handle_SIGCHLD);
923 /* create an archive */
924 if (opt & OPT_CREATE) {
926 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
928 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
930 /* NB: writeTarFile() closes tar_handle->src_fd */
931 return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
933 tar_handle->reject, zipMode);
936 while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
939 /* Check that every file that should have been extracted was */
940 while (tar_handle->accept) {
941 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
942 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
944 bb_error_msg_and_die("%s: not found in archive",
945 tar_handle->accept->data);
947 tar_handle->accept = tar_handle->accept->link;
949 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
950 close(tar_handle->src_fd);