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 #ifdef CONFIG_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 * Returns TRUE if successful. - DISABLED (no caller ever checked) */
154 static void putOctal(char *cp, int len, long long value)
157 /* long long for the sake of storing lengths of 4Gb+ files */
158 /* (we are bust anyway after 64Gb: it doesn't fit into the field) */
159 char tempBuffer[sizeof(long long)*3+1];
160 char *tempString = tempBuffer;
162 /* Create a string of the specified length with
163 * leading zeroes and the octal number, and a trailing null. */
164 tempLength = sprintf(tempBuffer, "%0*llo", len - 1, value);
166 /* If the string is too large, suppress leading 0's. */
167 /* If that is not enough, drop trailing null. */
168 tempLength -= len; /* easier to do checks */
169 while (tempLength >= 0) {
170 if (tempString[0] != '0') {
172 /* 1234 barely fits in 4 chars (w/o EOL '\0') */
175 /* 12345 doesn't fit into 4 chars */
178 tempLength--; /* still have leading '0', */
179 tempString++; /* can afford to drop it but retain EOL '\0' */
182 /* Copy the string to the field. */
183 memcpy(cp, tempString, len);
187 /* Write out a tar header for the specified file/directory/whatever */
188 void BUG_tar_header_size(void);
189 static int writeTarHeader(struct TarBallInfo *tbInfo,
190 const char *header_name, const char *fileName, struct stat *statbuf)
192 struct TarHeader header;
193 const unsigned char *cp;
197 if (sizeof(header) != 512)
198 BUG_tar_header_size();
200 bzero(&header, sizeof(struct TarHeader));
202 safe_strncpy(header.name, header_name, sizeof(header.name));
204 /* POSIX says to mask mode with 07777. */
205 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode & 07777);
206 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
207 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
208 if (sizeof(header.size) != sizeof("00000000000"))
209 BUG_tar_header_size();
210 strcpy(header.size, "00000000000"); /* Regular file size is handled later */
211 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
212 strcpy(header.magic, "ustar ");
214 /* Enter the user and group names (default to root if it fails) */
216 if (bb_getpwuid(header.uname, statbuf->st_uid, sizeof(header.uname)) == NULL)
217 strcpy(header.uname, "root");
218 if (bb_getgrgid(header.gname, statbuf->st_gid, sizeof(header.gname)) == NULL)
219 strcpy(header.gname, "root");
221 if (tbInfo->hlInfo) {
222 /* This is a hard link */
223 header.typeflag = LNKTYPE;
224 strncpy(header.linkname, tbInfo->hlInfo->name,
225 sizeof(header.linkname));
226 } else if (S_ISLNK(statbuf->st_mode)) {
227 char *lpath = xreadlink(fileName);
228 if (!lpath) /* Already printed err msg inside xreadlink() */
230 header.typeflag = SYMTYPE;
231 strncpy(header.linkname, lpath, sizeof(header.linkname));
232 /* If it is larger than 100 bytes, bail out */
233 if (header.linkname[sizeof(header.linkname)-1] /* at least 100? */
234 && lpath[sizeof(header.linkname)] /* and 101th is also not zero */
237 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
241 } else if (S_ISDIR(statbuf->st_mode)) {
242 header.typeflag = DIRTYPE;
243 strncat(header.name, "/", sizeof(header.name));
244 } else if (S_ISCHR(statbuf->st_mode)) {
245 header.typeflag = CHRTYPE;
246 putOctal(header.devmajor, sizeof(header.devmajor),
247 major(statbuf->st_rdev));
248 putOctal(header.devminor, sizeof(header.devminor),
249 minor(statbuf->st_rdev));
250 } else if (S_ISBLK(statbuf->st_mode)) {
251 header.typeflag = BLKTYPE;
252 putOctal(header.devmajor, sizeof(header.devmajor),
253 major(statbuf->st_rdev));
254 putOctal(header.devminor, sizeof(header.devminor),
255 minor(statbuf->st_rdev));
256 } else if (S_ISFIFO(statbuf->st_mode)) {
257 header.typeflag = FIFOTYPE;
258 } else if (S_ISREG(statbuf->st_mode)) {
259 header.typeflag = REGTYPE;
260 putOctal(header.size, sizeof(header.size), statbuf->st_size);
262 bb_error_msg("%s: unknown file type", fileName);
266 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
267 * the header). The checksum field must be filled with blanks for the
268 * calculation. The checksum field is formatted differently from the
269 * other fields: it has [6] digits, a null, then a space -- rather than
270 * digits, followed by a null like the other fields... */
271 memset(header.chksum, ' ', sizeof(header.chksum));
272 cp = (const unsigned char *) &header;
274 size = sizeof(struct TarHeader);
275 do { chksum += *cp++; } while (--size);
276 putOctal(header.chksum, sizeof(header.chksum)-1, chksum);
278 /* Now write the header out to disk */
279 xwrite(tbInfo->tarFd, &header, sizeof(struct TarHeader));
281 /* Now do the verbose thing (or not) */
283 if (tbInfo->verboseFlag) {
286 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
289 fprintf(vbFd, "%s\n", header.name);
295 # ifdef CONFIG_FEATURE_TAR_FROM
296 static int exclude_file(const llist_t *excluded_files, const char *file)
298 while (excluded_files) {
299 if (excluded_files->data[0] == '/') {
300 if (fnmatch(excluded_files->data, file,
301 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
306 for (p = file; p[0] != '\0'; p++) {
307 if ((p == file || p[-1] == '/') && p[0] != '/' &&
308 fnmatch(excluded_files->data, p,
309 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
313 excluded_files = excluded_files->link;
319 #define exclude_file(excluded_files, file) 0
322 static int writeFileToTarball(const char *fileName, struct stat *statbuf,
323 void *userData, int depth)
325 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
326 const char *header_name;
327 int inputFileFd = -1;
330 * Check to see if we are dealing with a hard link.
332 * Treat the first occurance of a given dev/inode as a file while
333 * treating any additional occurances as hard links. This is done
334 * by adding the file information to the HardLinkInfo linked list.
336 tbInfo->hlInfo = NULL;
337 if (statbuf->st_nlink > 1) {
338 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
339 if (tbInfo->hlInfo == NULL)
340 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName);
343 /* It is against the rules to archive a socket */
344 if (S_ISSOCK(statbuf->st_mode)) {
345 bb_error_msg("%s: socket ignored", fileName);
349 /* It is a bad idea to store the archive we are in the process of creating,
350 * so check the device and inode to be sure that this particular file isn't
352 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
353 tbInfo->statBuf.st_ino == statbuf->st_ino) {
354 bb_error_msg("%s: file is the archive; skipping", fileName);
358 header_name = fileName;
359 while (header_name[0] == '/') {
360 static int alreadyWarned = FALSE;
362 if (alreadyWarned == FALSE) {
363 bb_error_msg("removing leading '/' from member names");
364 alreadyWarned = TRUE;
369 if (strlen(fileName) >= NAME_SIZE) {
370 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
374 if (header_name[0] == '\0')
377 if (exclude_file(tbInfo->excludeList, header_name))
380 /* Is this a regular file? */
381 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
382 /* open the file we want to archive, and make sure all is well */
383 inputFileFd = open(fileName, O_RDONLY);
384 if (inputFileFd < 0) {
385 bb_perror_msg("%s: cannot open", fileName);
390 /* Add an entry to the tarball */
391 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
395 /* If it was a regular file, write out the body */
396 if (inputFileFd >= 0) {
399 /* write the file to the archive */
400 readSize = bb_copyfd_eof(inputFileFd, tbInfo->tarFd);
403 /* Pad the file up to the tar block size */
404 /* (a few tricks here in the name of code size) */
405 readSize = (-(int)readSize) & (TAR_BLOCK_SIZE-1);
406 bzero(bb_common_bufsiz1, readSize);
407 xwrite(tbInfo->tarFd, bb_common_bufsiz1, readSize);
413 static int writeTarFile(const int tar_fd, const int verboseFlag,
414 const unsigned long dereferenceFlag, const llist_t *include,
415 const llist_t *exclude, const int gzip)
418 int errorFlag = FALSE;
419 struct TarBallInfo tbInfo;
421 tbInfo.hlInfoHead = NULL;
423 fchmod(tar_fd, 0644);
424 tbInfo.tarFd = tar_fd;
425 tbInfo.verboseFlag = verboseFlag;
427 /* Store the stat info for the tarball's file, so
428 * can avoid including the tarball into itself.... */
429 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
430 bb_perror_msg_and_die("cannot stat tar file");
432 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
433 int gzipDataPipe[2] = { -1, -1 };
434 int gzipStatusPipe[2] = { -1, -1 };
435 volatile int vfork_exec_errno = 0;
436 char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
439 if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0)
440 bb_perror_msg_and_die("pipe");
442 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
445 /* Avoid vfork clobbering */
454 dup2(gzipDataPipe[0], 0);
455 close(gzipDataPipe[1]);
457 if (tbInfo.tarFd != 1)
458 dup2(tbInfo.tarFd, 1);
460 close(gzipStatusPipe[0]);
461 fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */
463 execlp(zip_exec, zip_exec, "-f", NULL);
464 vfork_exec_errno = errno;
466 close(gzipStatusPipe[1]);
468 } else if (gzipPid > 0) {
469 close(gzipDataPipe[0]);
470 close(gzipStatusPipe[1]);
475 int n = full_read(gzipStatusPipe[0], &buf, 1);
477 if (n == 0 && vfork_exec_errno != 0) {
478 errno = vfork_exec_errno;
479 bb_perror_msg_and_die("cannot exec %s", zip_exec);
480 } else if ((n < 0) && (errno == EAGAIN || errno == EINTR))
481 continue; /* try it again */
484 close(gzipStatusPipe[0]);
486 tbInfo.tarFd = gzipDataPipe[1];
487 } else bb_perror_msg_and_die("vfork gzip");
490 tbInfo.excludeList = exclude;
492 /* Read the directory/files and iterate over them one at a time */
494 if (!recursive_action(include->data, TRUE, dereferenceFlag,
495 FALSE, writeFileToTarball, writeFileToTarball, &tbInfo, 0))
499 include = include->link;
501 /* Write two empty blocks to the end of the archive */
502 bzero(bb_common_bufsiz1, 2*TAR_BLOCK_SIZE);
503 xwrite(tbInfo.tarFd, bb_common_bufsiz1, 2*TAR_BLOCK_SIZE);
505 /* To be pedantically correct, we would check if the tarball
506 * is smaller than 20 tar blocks, and pad it if it was smaller,
507 * but that isn't necessary for GNU tar interoperability, and
508 * so is considered a waste of space */
510 /* Close so the child process (if any) will exit */
513 /* Hang up the tools, close up shop, head home */
514 if (ENABLE_FEATURE_CLEAN_UP)
515 freeHardLinkInfo(&tbInfo.hlInfoHead);
518 bb_error_msg("error exit delayed from previous errors");
520 if (gzipPid && waitpid(gzipPid, NULL, 0) == -1)
521 bb_error_msg("waitpid failed");
526 int writeTarFile(const int tar_fd, const int verboseFlag,
527 const unsigned long dereferenceFlag, const llist_t *include,
528 const llist_t *exclude, const int gzip);
529 #endif /* tar_create */
531 #ifdef CONFIG_FEATURE_TAR_FROM
532 static llist_t *append_file_list_to_list(llist_t *list)
538 llist_t *newlist = NULL;
541 src_stream = xfopen(cur->data, "r");
545 while ((line = xmalloc_getline(src_stream)) != NULL) {
546 char *filename_ptr = last_char_is(line, '/');
547 if (filename_ptr > line)
548 *filename_ptr = '\0';
549 llist_add_to(&newlist, line);
556 #define append_file_list_to_list(x) 0
559 #ifdef CONFIG_FEATURE_TAR_COMPRESS
560 static char get_header_tar_Z(archive_handle_t *archive_handle)
562 /* Can't lseek over pipes */
563 archive_handle->seek = seek_by_read;
565 /* do the decompression, and cleanup */
566 if (xread_char(archive_handle->src_fd) != 0x1f ||
567 xread_char(archive_handle->src_fd) != 0x9d)
569 bb_error_msg_and_die("invalid magic");
572 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress);
573 archive_handle->offset = 0;
574 while (get_header_tar(archive_handle) == EXIT_SUCCESS)
577 /* Can only do one file at a time */
581 #define get_header_tar_Z 0
584 #define CTX_TEST (1 << 0)
585 #define CTX_EXTRACT (1 << 1)
586 #define TAR_OPT_BASEDIR (1 << 2)
587 #define TAR_OPT_TARNAME (1 << 3)
588 #define TAR_OPT_2STDOUT (1 << 4)
589 #define TAR_OPT_P (1 << 5)
590 #define TAR_OPT_VERBOSE (1 << 6)
591 #define TAR_OPT_KEEP_OLD (1 << 7)
593 #define TAR_OPT_AFTER_START 8
595 #define CTX_CREATE (1 << (TAR_OPT_AFTER_START))
596 #define TAR_OPT_DEREFERENCE (1 << (TAR_OPT_AFTER_START + 1))
597 #ifdef CONFIG_FEATURE_TAR_CREATE
598 # define TAR_OPT_STR_CREATE "ch"
599 # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START + 2
601 # define TAR_OPT_STR_CREATE ""
602 # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START
605 #define TAR_OPT_BZIP2 (1 << (TAR_OPT_AFTER_CREATE))
606 #ifdef CONFIG_FEATURE_TAR_BZIP2
607 # define TAR_OPT_STR_BZIP2 "j"
608 # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE + 1
610 # define TAR_OPT_STR_BZIP2 ""
611 # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE
614 #define TAR_OPT_LZMA (1 << (TAR_OPT_AFTER_BZIP2))
615 #ifdef CONFIG_FEATURE_TAR_LZMA
616 # define TAR_OPT_STR_LZMA "a"
617 # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2 + 1
619 # define TAR_OPT_STR_LZMA ""
620 # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2
623 #define TAR_OPT_INCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA))
624 #define TAR_OPT_EXCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA + 1))
625 #ifdef CONFIG_FEATURE_TAR_FROM
626 # define TAR_OPT_STR_FROM "T:X:"
627 # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA + 2
629 # define TAR_OPT_STR_FROM ""
630 # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA
633 #define TAR_OPT_GZIP (1 << (TAR_OPT_AFTER_FROM))
634 #ifdef CONFIG_FEATURE_TAR_GZIP
635 # define TAR_OPT_STR_GZIP "z"
636 # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM + 1
638 # define TAR_OPT_STR_GZIP ""
639 # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM
642 #define TAR_OPT_UNCOMPRESS (1 << (TAR_OPT_AFTER_GZIP))
643 #ifdef CONFIG_FEATURE_TAR_COMPRESS
644 # define TAR_OPT_STR_COMPRESS "Z"
645 # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP + 1
647 # define TAR_OPT_STR_COMPRESS ""
648 # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP
651 #define TAR_OPT_NOPRESERVE_OWN (1 << (TAR_OPT_AFTER_COMPRESS))
652 #define TAR_OPT_NOPRESERVE_PERM (1 << (TAR_OPT_AFTER_COMPRESS + 1))
653 #define TAR_OPT_STR_NOPRESERVE "\203\213"
654 #define TAR_OPT_AFTER_NOPRESERVE TAR_OPT_AFTER_COMPRESS + 2
656 static const char tar_options[] = "txC:f:Opvk" \
662 TAR_OPT_STR_COMPRESS \
663 TAR_OPT_STR_NOPRESERVE;
665 #ifdef CONFIG_FEATURE_TAR_LONG_OPTIONS
666 static const struct option tar_long_options[] = {
667 { "list", 0, NULL, 't' },
668 { "extract", 0, NULL, 'x' },
669 { "directory", 1, NULL, 'C' },
670 { "file", 1, NULL, 'f' },
671 { "to-stdout", 0, NULL, 'O' },
672 { "same-permissions", 0, NULL, 'p' },
673 { "verbose", 0, NULL, 'v' },
674 { "keep-old", 0, NULL, 'k' },
675 { "no-same-owner", 0, NULL, '\203' },
676 { "no-same-permissions",0, NULL, '\213' },
677 # ifdef CONFIG_FEATURE_TAR_CREATE
678 { "create", 0, NULL, 'c' },
679 { "dereference", 0, NULL, 'h' },
681 # ifdef CONFIG_FEATURE_TAR_BZIP2
682 { "bzip2", 0, NULL, 'j' },
684 # ifdef CONFIG_FEATURE_TAR_LZMA
685 { "lzma", 0, NULL, 'a' },
687 # ifdef CONFIG_FEATURE_TAR_FROM
688 { "files-from", 1, NULL, 'T' },
689 { "exclude-from", 1, NULL, 'X' },
690 { "exclude", 1, NULL, '\n' },
692 # ifdef CONFIG_FEATURE_TAR_GZIP
693 { "gzip", 0, NULL, 'z' },
695 # ifdef CONFIG_FEATURE_TAR_COMPRESS
696 { "compress", 0, NULL, 'Z' },
701 #define tar_long_options 0
704 int tar_main(int argc, char **argv)
706 char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
707 archive_handle_t *tar_handle;
708 char *base_dir = NULL;
709 const char *tar_filename = "-";
711 llist_t *excludes = NULL;
713 /* Initialise default values */
714 tar_handle = init_handle();
715 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL;
717 /* Prepend '-' to the first argument if required */
718 opt_complementary = ENABLE_FEATURE_TAR_CREATE ?
719 "--:X::T::\n::c:t:x:?:c--tx:t--cx:x--ct" :
720 "--:X::T::\n::t:x:?:t--x:x--t";
721 if (ENABLE_FEATURE_TAR_LONG_OPTIONS)
722 applet_long_options = tar_long_options;
723 opt = getopt32(argc, argv, tar_options,
724 &base_dir, /* Change to dir <optarg> */
725 &tar_filename /* archive filename */
726 #ifdef CONFIG_FEATURE_TAR_FROM
727 , &(tar_handle->accept),
728 &(tar_handle->reject),
733 if (opt & CTX_TEST) {
734 if (tar_handle->action_header == header_list
735 || tar_handle->action_header == header_verbose_list
737 tar_handle->action_header = header_verbose_list;
739 tar_handle->action_header = header_list;
741 if ((opt & CTX_EXTRACT) && tar_handle->action_data != data_extract_to_stdout)
742 tar_handle->action_data = data_extract_all;
744 if (opt & TAR_OPT_2STDOUT)
745 tar_handle->action_data = data_extract_to_stdout;
747 if (opt & TAR_OPT_VERBOSE) {
748 if (tar_handle->action_header == header_list
749 || tar_handle->action_header == header_verbose_list
751 tar_handle->action_header = header_verbose_list;
753 tar_handle->action_header = header_list;
755 if (opt & TAR_OPT_KEEP_OLD)
756 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
758 if (opt & TAR_OPT_NOPRESERVE_OWN)
759 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
761 if (opt & TAR_OPT_NOPRESERVE_PERM)
762 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
764 if (ENABLE_FEATURE_TAR_GZIP && (opt & TAR_OPT_GZIP))
765 get_header_ptr = get_header_tar_gz;
767 if (ENABLE_FEATURE_TAR_BZIP2 && (opt & TAR_OPT_BZIP2))
768 get_header_ptr = get_header_tar_bz2;
770 if (ENABLE_FEATURE_TAR_LZMA && (opt & TAR_OPT_LZMA))
771 get_header_ptr = get_header_tar_lzma;
773 if (ENABLE_FEATURE_TAR_COMPRESS && (opt & TAR_OPT_UNCOMPRESS))
774 get_header_ptr = get_header_tar_Z;
776 if (ENABLE_FEATURE_TAR_FROM) {
777 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
778 /* Append excludes to reject */
780 llist_t *temp = excludes->link;
781 excludes->link = tar_handle->reject;
782 tar_handle->reject = excludes;
785 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
788 /* Check if we are reading from stdin */
789 if (argv[optind] && *argv[optind] == '-') {
790 /* Default is to read from stdin, so just skip to next arg */
794 /* Setup an array of filenames to work with */
795 /* TODO: This is the same as in ar, separate function ? */
796 while (optind < argc) {
797 char *filename_ptr = last_char_is(argv[optind], '/');
798 if (filename_ptr > argv[optind])
799 *filename_ptr = '\0';
801 llist_add_to(&(tar_handle->accept), argv[optind]);
805 if (tar_handle->accept || tar_handle->reject)
806 tar_handle->filter = filter_accept_reject_list;
808 /* Open the tar file */
813 if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
814 /* Make sure there is at least one file to tar up. */
815 if (tar_handle->accept == NULL)
816 bb_error_msg_and_die("empty archive");
819 /* Mimicking GNU tar 1.15.1: */
820 flags = O_WRONLY|O_CREAT|O_TRUNC;
821 /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */
827 if ((tar_filename[0] == '-') && (tar_filename[1] == '\0')) {
828 tar_handle->src_fd = fileno(tar_stream);
829 tar_handle->seek = seek_by_read;
831 tar_handle->src_fd = xopen3(tar_filename, flags, 0666);
838 /* create an archive */
839 if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
840 int verboseFlag = FALSE;
843 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
845 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
848 if (tar_handle->action_header == header_list
849 || tar_handle->action_header == header_verbose_list
853 writeTarFile(tar_handle->src_fd, verboseFlag, opt & TAR_OPT_DEREFERENCE,
855 tar_handle->reject, zipMode);
857 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",
866 tar_handle->accept->data);
868 tar_handle->accept = tar_handle->accept->link;
872 if (ENABLE_FEATURE_CLEAN_UP && tar_handle->src_fd != STDIN_FILENO)
873 close(tar_handle->src_fd);