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.
37 #include <sys/socket.h>
38 #include <sys/sysmacros.h> /* major() and minor() */
39 #include "unarchive.h"
42 #ifdef CONFIG_FEATURE_TAR_CREATE
44 /* Tar file constants */
45 # define TAR_MAGIC "ustar" /* ustar and a null */
46 # define TAR_VERSION " " /* Be compatible with GNU tar format */
48 #define TAR_BLOCK_SIZE 512
49 #define TAR_MAGIC_LEN 6
50 #define TAR_VERSION_LEN 2
52 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
54 struct TarHeader { /* byte offset */
55 char name[NAME_SIZE]; /* 0-99 */
56 char mode[8]; /* 100-107 */
57 char uid[8]; /* 108-115 */
58 char gid[8]; /* 116-123 */
59 char size[12]; /* 124-135 */
60 char mtime[12]; /* 136-147 */
61 char chksum[8]; /* 148-155 */
62 char typeflag; /* 156-156 */
63 char linkname[NAME_SIZE]; /* 157-256 */
64 char magic[6]; /* 257-262 */
65 char version[2]; /* 263-264 */
66 char uname[32]; /* 265-296 */
67 char gname[32]; /* 297-328 */
68 char devmajor[8]; /* 329-336 */
69 char devminor[8]; /* 337-344 */
70 char prefix[155]; /* 345-499 */
71 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
73 typedef struct TarHeader TarHeader;
76 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
77 ** the only functions that deal with the HardLinkInfo structure.
78 ** Even these functions use the xxxHardLinkInfo() functions.
80 typedef struct HardLinkInfo HardLinkInfo;
82 HardLinkInfo *next; /* Next entry in list */
83 dev_t dev; /* Device number */
84 ino_t ino; /* Inode number */
85 short linkCount; /* (Hard) Link Count */
86 char name[1]; /* Start of filename (must be last) */
89 /* Some info to be carried along when creating a new tarball */
91 char *fileName; /* File name of the tarball */
92 int tarFd; /* Open-for-write file descriptor
94 struct stat statBuf; /* Stat info for the tarball, letting
95 us know the inode and device that the
96 tarball lives, so we can avoid trying
97 to include the tarball into itself */
98 int verboseFlag; /* Whether to print extra stuff or not */
99 const llist_t *excludeList; /* List of files to not include */
100 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
101 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
103 typedef struct TarBallInfo TarBallInfo;
105 /* A nice enum with all the possible tar file content types */
107 REGTYPE = '0', /* regular file */
108 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
109 LNKTYPE = '1', /* hard link */
110 SYMTYPE = '2', /* symbolic link */
111 CHRTYPE = '3', /* character special */
112 BLKTYPE = '4', /* block special */
113 DIRTYPE = '5', /* directory */
114 FIFOTYPE = '6', /* FIFO special */
115 CONTTYPE = '7', /* reserved */
116 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
117 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
119 typedef enum TarFileType TarFileType;
121 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
122 static inline void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
123 struct stat *statbuf,
126 /* Note: hlInfoHeadPtr can never be NULL! */
127 HardLinkInfo *hlInfo;
129 hlInfo = (HardLinkInfo *) xmalloc(sizeof(HardLinkInfo) + strlen(name));
130 hlInfo->next = *hlInfoHeadPtr;
131 *hlInfoHeadPtr = hlInfo;
132 hlInfo->dev = statbuf->st_dev;
133 hlInfo->ino = statbuf->st_ino;
134 hlInfo->linkCount = statbuf->st_nlink;
135 strcpy(hlInfo->name, name);
138 static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
140 HardLinkInfo *hlInfo = NULL;
141 HardLinkInfo *hlInfoNext = NULL;
144 hlInfo = *hlInfoHeadPtr;
146 hlInfoNext = hlInfo->next;
150 *hlInfoHeadPtr = NULL;
155 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
156 static inline HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf)
159 if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
161 hlInfo = hlInfo->next;
166 /* Put an octal string into the specified buffer.
167 * The number is zero and space padded and possibly null padded.
168 * Returns TRUE if successful. */
169 static int putOctal(char *cp, int len, long value)
173 char *tempString = tempBuffer;
175 /* Create a string of the specified length with an initial space,
176 * leading zeroes and the octal number, and a trailing null. */
177 sprintf(tempString, "%0*lo", len - 1, value);
179 /* If the string is too large, suppress the leading space. */
180 tempLength = strlen(tempString) + 1;
181 if (tempLength > len) {
186 /* If the string is still too large, suppress the trailing null. */
187 if (tempLength > len)
190 /* If the string is still too large, fail. */
191 if (tempLength > len)
194 /* Copy the string to the field. */
195 memcpy(cp, tempString, len);
200 /* Write out a tar header for the specified file/directory/whatever */
201 static inline int writeTarHeader(struct TarBallInfo *tbInfo,
202 const char *header_name, const char *real_name, struct stat *statbuf)
205 struct TarHeader header;
206 const unsigned char *cp = (const unsigned char *) &header;
207 ssize_t size = sizeof(struct TarHeader);
209 memset(&header, 0, size);
211 strncpy(header.name, header_name, sizeof(header.name));
213 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
214 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
215 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
216 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
217 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
218 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
219 TAR_MAGIC_LEN + TAR_VERSION_LEN);
221 /* Enter the user and group names (default to root if it fails) */
222 if (bb_getpwuid(header.uname, statbuf->st_uid, sizeof(header.uname)) == NULL)
223 strcpy(header.uname, "root");
224 if (bb_getgrgid(header.gname, statbuf->st_gid, sizeof(header.gname)) == NULL)
225 strcpy(header.gname, "root");
227 if (tbInfo->hlInfo) {
228 /* This is a hard link */
229 header.typeflag = LNKTYPE;
230 strncpy(header.linkname, tbInfo->hlInfo->name,
231 sizeof(header.linkname));
232 } else if (S_ISLNK(statbuf->st_mode)) {
233 char *lpath = xreadlink(real_name);
235 if (!lpath) /* Already printed err msg inside xreadlink() */
237 header.typeflag = SYMTYPE;
238 strncpy(header.linkname, lpath, sizeof(header.linkname));
240 } else if (S_ISDIR(statbuf->st_mode)) {
241 header.typeflag = DIRTYPE;
242 strncat(header.name, "/", sizeof(header.name));
243 } else if (S_ISCHR(statbuf->st_mode)) {
244 header.typeflag = CHRTYPE;
245 putOctal(header.devmajor, sizeof(header.devmajor),
246 major(statbuf->st_rdev));
247 putOctal(header.devminor, sizeof(header.devminor),
248 minor(statbuf->st_rdev));
249 } else if (S_ISBLK(statbuf->st_mode)) {
250 header.typeflag = BLKTYPE;
251 putOctal(header.devmajor, sizeof(header.devmajor),
252 major(statbuf->st_rdev));
253 putOctal(header.devminor, sizeof(header.devminor),
254 minor(statbuf->st_rdev));
255 } else if (S_ISFIFO(statbuf->st_mode)) {
256 header.typeflag = FIFOTYPE;
257 } else if (S_ISREG(statbuf->st_mode)) {
258 header.typeflag = REGTYPE;
259 putOctal(header.size, sizeof(header.size), statbuf->st_size);
261 bb_error_msg("%s: Unknown file type", real_name);
265 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
266 * the header). The checksum field must be filled with blanks for the
267 * calculation. The checksum field is formatted differently from the
268 * other fields: it has [6] digits, a null, then a space -- rather than
269 * digits, followed by a null like the other fields... */
270 memset(header.chksum, ' ', sizeof(header.chksum));
271 cp = (const unsigned char *) &header;
274 putOctal(header.chksum, 7, chksum);
276 /* Now write the header out to disk */
278 bb_full_write(tbInfo->tarFd, (char *) &header,
279 sizeof(struct TarHeader))) < 0) {
280 bb_error_msg(bb_msg_io_error, real_name);
283 /* Pad the header up to the tar block size */
284 for (; size < TAR_BLOCK_SIZE; size++) {
285 write(tbInfo->tarFd, "\0", 1);
287 /* Now do the verbose thing (or not) */
289 if (tbInfo->verboseFlag) {
292 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
295 fprintf(vbFd, "%s\n", header.name);
301 # ifdef CONFIG_FEATURE_TAR_FROM
302 static inline int exclude_file(const llist_t *excluded_files, const char *file)
304 while (excluded_files) {
305 if (excluded_files->data[0] == '/') {
306 if (fnmatch(excluded_files->data, file,
307 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
312 for (p = file; p[0] != '\0'; p++) {
313 if ((p == file || p[-1] == '/') && p[0] != '/' &&
314 fnmatch(excluded_files->data, p,
315 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
319 excluded_files = excluded_files->link;
325 #define exclude_file(excluded_files, file) 0
328 static int writeFileToTarball(const char *fileName, struct stat *statbuf,
331 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
332 const char *header_name;
333 int inputFileFd = -1;
336 ** Check to see if we are dealing with a hard link.
338 ** Treat the first occurance of a given dev/inode as a file while
339 ** treating any additional occurances as hard links. This is done
340 ** by adding the file information to the HardLinkInfo linked list.
342 tbInfo->hlInfo = NULL;
343 if (statbuf->st_nlink > 1) {
344 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
345 if (tbInfo->hlInfo == NULL)
346 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName);
349 /* It is against the rules to archive a socket */
350 if (S_ISSOCK(statbuf->st_mode)) {
351 bb_error_msg("%s: socket ignored", fileName);
355 /* It is a bad idea to store the archive we are in the process of creating,
356 * so check the device and inode to be sure that this particular file isn't
358 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
359 tbInfo->statBuf.st_ino == statbuf->st_ino) {
360 bb_error_msg("%s: file is the archive; skipping", fileName);
364 header_name = fileName;
365 while (header_name[0] == '/') {
366 static int alreadyWarned = FALSE;
368 if (alreadyWarned == FALSE) {
369 bb_error_msg("Removing leading '/' from member names");
370 alreadyWarned = TRUE;
375 if (strlen(fileName) >= NAME_SIZE) {
376 bb_error_msg(bb_msg_name_longer_than_foo, NAME_SIZE);
380 if (header_name[0] == '\0')
383 if (ENABLE_FEATURE_TAR_FROM &&
384 exclude_file(tbInfo->excludeList, header_name)) {
388 /* Is this a regular file? */
389 if ((tbInfo->hlInfo == NULL) && (S_ISREG(statbuf->st_mode))) {
391 /* open the file we want to archive, and make sure all is well */
392 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
393 bb_perror_msg("%s: Cannot open", fileName);
398 /* Add an entry to the tarball */
399 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
403 /* If it was a regular file, write out the body */
404 if (inputFileFd >= 0 ) {
405 ssize_t readSize = 0;
407 /* write the file to the archive */
408 readSize = bb_copyfd_eof(inputFileFd, tbInfo->tarFd);
411 /* Pad the file up to the tar block size */
412 for (; (readSize % TAR_BLOCK_SIZE) != 0; readSize++)
413 write(tbInfo->tarFd, "\0", 1);
419 static inline int writeTarFile(const int tar_fd, const int verboseFlag,
420 const unsigned long dereferenceFlag, const llist_t *include,
421 const llist_t *exclude, const int gzip)
425 int errorFlag = FALSE;
427 struct TarBallInfo tbInfo;
429 tbInfo.hlInfoHead = NULL;
431 fchmod(tar_fd, 0644);
432 tbInfo.tarFd = tar_fd;
433 tbInfo.verboseFlag = verboseFlag;
435 /* Store the stat info for the tarball's file, so
436 * can avoid including the tarball into itself.... */
437 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
438 bb_perror_msg_and_die("Couldnt stat tar file");
440 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
441 int gzipDataPipe[2] = { -1, -1 };
442 int gzipStatusPipe[2] = { -1, -1 };
443 volatile int vfork_exec_errno = 0;
444 char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
447 if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0)
448 bb_perror_msg_and_die("create pipe");
450 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
453 /* Avoid vfork clobbering */
462 dup2(gzipDataPipe[0], 0);
463 close(gzipDataPipe[1]);
465 if (tbInfo.tarFd != 1)
466 dup2(tbInfo.tarFd, 1);
468 close(gzipStatusPipe[0]);
469 fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */
471 execlp(zip_exec, zip_exec, "-f", NULL);
472 vfork_exec_errno = errno;
474 close(gzipStatusPipe[1]);
476 } else if (gzipPid > 0) {
477 close(gzipDataPipe[0]);
478 close(gzipStatusPipe[1]);
483 int n = bb_full_read(gzipStatusPipe[0], &buf, 1);
485 if (n == 0 && vfork_exec_errno != 0) {
486 errno = vfork_exec_errno;
487 bb_perror_msg_and_die("Could not exec %s", zip_exec);
488 } else if ((n < 0) && (errno == EAGAIN || errno == EINTR))
489 continue; /* try it again */
492 close(gzipStatusPipe[0]);
494 tbInfo.tarFd = gzipDataPipe[1];
495 } else bb_perror_msg_and_die("vfork gzip");
498 tbInfo.excludeList = exclude;
500 /* Read the directory/files and iterate over them one at a time */
502 if (!recursive_action(include->data, TRUE, dereferenceFlag,
503 FALSE, writeFileToTarball, writeFileToTarball, &tbInfo))
507 include = include->link;
509 /* Write two empty blocks to the end of the archive */
510 for (size = 0; size < (2 * TAR_BLOCK_SIZE); size++)
511 write(tbInfo.tarFd, "\0", 1);
513 /* To be pedantically correct, we would check if the tarball
514 * is smaller than 20 tar blocks, and pad it if it was smaller,
515 * but that isn't necessary for GNU tar interoperability, and
516 * so is considered a waste of space */
518 /* Close so the child process (if any) will exit */
521 /* Hang up the tools, close up shop, head home */
522 if (ENABLE_FEATURE_CLEAN_UP)
523 freeHardLinkInfo(&tbInfo.hlInfoHead);
526 bb_error_msg("Error exit delayed from previous errors");
528 if (gzipPid && waitpid(gzipPid, NULL, 0)==-1)
529 bb_error_msg("Couldnt wait");
534 int writeTarFile(const int tar_fd, const int verboseFlag,
535 const unsigned long dereferenceFlag, const llist_t *include,
536 const llist_t *exclude, const int gzip);
537 #endif /* tar_create */
539 #ifdef CONFIG_FEATURE_TAR_FROM
540 static llist_t *append_file_list_to_list(llist_t *list)
546 llist_t *newlist = NULL;
549 src_stream = bb_xfopen(cur->data, "r");
553 while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL)
554 newlist = llist_add_to(newlist, line);
560 #define append_file_list_to_list(x) 0
563 #ifdef CONFIG_FEATURE_TAR_COMPRESS
564 static char get_header_tar_Z(archive_handle_t *archive_handle)
566 /* Cant lseek over pipe's */
567 archive_handle->seek = seek_by_char;
569 /* do the decompression, and cleanup */
570 if (bb_xread_char(archive_handle->src_fd) != 0x1f ||
571 bb_xread_char(archive_handle->src_fd) != 0x9d)
573 bb_error_msg_and_die("Invalid magic");
576 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress);
577 archive_handle->offset = 0;
578 while (get_header_tar(archive_handle) == EXIT_SUCCESS);
580 /* Can only do one file at a time */
581 return(EXIT_FAILURE);
584 #define get_header_tar_Z 0
587 #define CTX_TEST (1 << 0)
588 #define CTX_EXTRACT (1 << 1)
589 #define TAR_OPT_BASEDIR (1 << 2)
590 #define TAR_OPT_TARNAME (1 << 3)
591 #define TAR_OPT_2STDOUT (1 << 4)
592 #define TAR_OPT_P (1 << 5)
593 #define TAR_OPT_VERBOSE (1 << 6)
594 #define TAR_OPT_KEEP_OLD (1 << 7)
596 #define TAR_OPT_AFTER_START 8
598 #define CTX_CREATE (1 << (TAR_OPT_AFTER_START))
599 #define TAR_OPT_DEREFERENCE (1 << (TAR_OPT_AFTER_START + 1))
600 #ifdef CONFIG_FEATURE_TAR_CREATE
601 # define TAR_OPT_STR_CREATE "ch"
602 # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START + 2
604 # define TAR_OPT_STR_CREATE ""
605 # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START
608 #define TAR_OPT_BZIP2 (1 << (TAR_OPT_AFTER_CREATE))
609 #ifdef CONFIG_FEATURE_TAR_BZIP2
610 # define TAR_OPT_STR_BZIP2 "j"
611 # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE + 1
613 # define TAR_OPT_STR_BZIP2 ""
614 # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE
617 #define TAR_OPT_LZMA (1 << (TAR_OPT_AFTER_BZIP2))
618 #ifdef CONFIG_FEATURE_TAR_LZMA
619 # define TAR_OPT_STR_LZMA "a"
620 # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2 + 1
622 # define TAR_OPT_STR_LZMA ""
623 # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2
626 #define TAR_OPT_INCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA))
627 #define TAR_OPT_EXCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA + 1))
628 #ifdef CONFIG_FEATURE_TAR_FROM
629 # define TAR_OPT_STR_FROM "T:X:"
630 # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA + 2
632 # define TAR_OPT_STR_FROM ""
633 # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA
636 #define TAR_OPT_GZIP (1 << (TAR_OPT_AFTER_FROM))
637 #ifdef CONFIG_FEATURE_TAR_GZIP
638 # define TAR_OPT_STR_GZIP "z"
639 # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM + 1
641 # define TAR_OPT_STR_GZIP ""
642 # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM
645 #define TAR_OPT_UNCOMPRESS (1 << (TAR_OPT_AFTER_GZIP))
646 #ifdef CONFIG_FEATURE_TAR_COMPRESS
647 # define TAR_OPT_STR_COMPRESS "Z"
648 # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP + 1
650 # define TAR_OPT_STR_COMPRESS ""
651 # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP
654 #define TAR_OPT_NOPRESERVE_OWN (1 << (TAR_OPT_AFTER_COMPRESS))
655 #define TAR_OPT_NOPRESERVE_PERM (1 << (TAR_OPT_AFTER_COMPRESS + 1))
656 #define TAR_OPT_STR_NOPRESERVE "\203\213"
657 #define TAR_OPT_AFTER_NOPRESERVE TAR_OPT_AFTER_COMPRESS + 2
659 static const char tar_options[]="txC:f:Opvk" \
665 TAR_OPT_STR_COMPRESS \
666 TAR_OPT_STR_NOPRESERVE;
668 #ifdef CONFIG_FEATURE_TAR_LONG_OPTIONS
669 static const struct option tar_long_options[] = {
670 { "list", 0, NULL, 't' },
671 { "extract", 0, NULL, 'x' },
672 { "directory", 1, NULL, 'C' },
673 { "file", 1, NULL, 'f' },
674 { "to-stdout", 0, NULL, 'O' },
675 { "same-permissions", 0, NULL, 'p' },
676 { "verbose", 0, NULL, 'v' },
677 { "keep-old", 0, NULL, 'k' },
678 { "no-same-owner", 0, NULL, '\203' },
679 { "no-same-permissions",0, NULL, '\213' },
680 # ifdef CONFIG_FEATURE_TAR_CREATE
681 { "create", 0, NULL, 'c' },
682 { "dereference", 0, NULL, 'h' },
684 # ifdef CONFIG_FEATURE_TAR_BZIP2
685 { "bzip2", 0, NULL, 'j' },
687 # ifdef CONFIG_FEATURE_TAR_LZMA
688 { "lzma", 0, NULL, 'a' },
690 # ifdef CONFIG_FEATURE_TAR_FROM
691 { "files-from", 1, NULL, 'T' },
692 { "exclude-from", 1, NULL, 'X' },
693 { "exclude", 1, NULL, '\n' },
695 # ifdef CONFIG_FEATURE_TAR_GZIP
696 { "gzip", 0, NULL, 'z' },
698 # ifdef CONFIG_FEATURE_TAR_COMPRESS
699 { "compress", 0, NULL, 'Z' },
704 #define tar_long_options 0
707 int tar_main(int argc, char **argv)
709 char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
710 archive_handle_t *tar_handle;
711 char *base_dir = NULL;
712 const char *tar_filename = "-";
714 llist_t *excludes = NULL;
716 /* Initialise default values */
717 tar_handle = init_handle();
718 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL;
720 /* Prepend '-' to the first argument if required */
721 bb_opt_complementally = ENABLE_FEATURE_TAR_CREATE ?
722 "--:X::T::\n::c:t:x:?:c--tx:t--cx:x--ct" :
723 "--:X::T::\n::t:x:?:t--x:x--t";
724 if (ENABLE_FEATURE_TAR_LONG_OPTIONS)
725 bb_applet_long_options = tar_long_options;
726 opt = bb_getopt_ulflags(argc, argv, tar_options,
727 &base_dir, /* Change to dir <optarg> */
728 &tar_filename /* archive filename */
729 #ifdef CONFIG_FEATURE_TAR_FROM
730 , &(tar_handle->accept),
731 &(tar_handle->reject),
736 if (opt & CTX_TEST) {
737 if ((tar_handle->action_header == header_list) ||
738 (tar_handle->action_header == header_verbose_list))
740 tar_handle->action_header = header_verbose_list;
741 } else tar_handle->action_header = header_list;
743 if((opt & CTX_EXTRACT) && tar_handle->action_data != data_extract_to_stdout)
744 tar_handle->action_data = data_extract_all;
746 if (opt & TAR_OPT_2STDOUT)
747 tar_handle->action_data = data_extract_to_stdout;
749 if (opt & TAR_OPT_VERBOSE) {
750 if ((tar_handle->action_header == header_list) ||
751 (tar_handle->action_header == header_verbose_list))
753 tar_handle->action_header = header_verbose_list;
755 tar_handle->action_header = header_list;
757 if (opt & TAR_OPT_KEEP_OLD)
758 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
760 if (opt & TAR_OPT_NOPRESERVE_OWN)
761 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
763 if (opt & TAR_OPT_NOPRESERVE_PERM)
764 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
766 if (ENABLE_FEATURE_TAR_GZIP && (opt & TAR_OPT_GZIP))
767 get_header_ptr = get_header_tar_gz;
769 if (ENABLE_FEATURE_TAR_BZIP2 && (opt & TAR_OPT_BZIP2))
770 get_header_ptr = get_header_tar_bz2;
772 if (ENABLE_FEATURE_TAR_LZMA && (opt & TAR_OPT_LZMA))
773 get_header_ptr = get_header_tar_lzma;
775 if (ENABLE_FEATURE_TAR_COMPRESS && (opt & TAR_OPT_UNCOMPRESS))
776 get_header_ptr = get_header_tar_Z;
778 if (ENABLE_FEATURE_TAR_FROM) {
779 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
780 /* Append excludes to reject */
782 llist_t *temp = excludes->link;
783 excludes->link = tar_handle->reject;
784 tar_handle->reject = excludes;
787 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
790 /* Check if we are reading from stdin */
791 if (argv[optind] && *argv[optind] == '-') {
792 /* Default is to read from stdin, so just skip to next arg */
796 /* Setup an array of filenames to work with */
797 /* TODO: This is the same as in ar, separate function ? */
798 while (optind < argc) {
799 char *filename_ptr = last_char_is(argv[optind], '/');
800 if (filename_ptr > argv[optind])
801 *filename_ptr = '\0';
803 tar_handle->accept = llist_add_to(tar_handle->accept, argv[optind]);
807 if ((tar_handle->accept) || (tar_handle->reject))
808 tar_handle->filter = filter_accept_reject_list;
810 /* Open the tar file */
815 if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
816 /* Make sure there is at least one file to tar up. */
817 if (tar_handle->accept == NULL)
818 bb_error_msg_and_die("empty archive");
821 flags = O_WRONLY | O_CREAT | O_EXCL;
822 unlink(tar_filename);
828 if ((tar_filename[0] == '-') && (tar_filename[1] == '\0')) {
829 tar_handle->src_fd = fileno(tar_stream);
830 tar_handle->seek = seek_by_char;
832 tar_handle->src_fd = bb_xopen(tar_filename, flags);
839 /* create an archive */
840 if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
841 int verboseFlag = FALSE;
844 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
846 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
849 if ((tar_handle->action_header == header_list) ||
850 (tar_handle->action_header == header_verbose_list))
854 writeTarFile(tar_handle->src_fd, verboseFlag, opt & TAR_OPT_DEREFERENCE,
856 tar_handle->reject, zipMode);
858 while (get_header_ptr(tar_handle) == EXIT_SUCCESS);
860 /* Check that every file that should have been extracted was */
861 while (tar_handle->accept) {
862 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
863 && !find_list_entry(tar_handle->passed, tar_handle->accept->data))
865 bb_error_msg_and_die("%s: Not found in archive", tar_handle->accept->data);
867 tar_handle->accept = tar_handle->accept->link;
871 if (ENABLE_FEATURE_CLEAN_UP && tar_handle->src_fd != STDIN_FILENO)
872 close(tar_handle->src_fd);
874 return(EXIT_SUCCESS);