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
22 * This is free software under the GNU General Public License.
24 * Licensed under GPL v2 (or later), see file LICENSE in this tarball.
38 #include <sys/socket.h>
39 #include <sys/sysmacros.h> /* major() and minor() */
40 #include "unarchive.h"
43 #ifdef CONFIG_FEATURE_TAR_CREATE
45 /* Tar file constants */
46 # define TAR_MAGIC "ustar" /* ustar and a null */
47 # define TAR_VERSION " " /* Be compatable with GNU tar format */
49 #define TAR_BLOCK_SIZE 512
50 #define TAR_MAGIC_LEN 6
51 #define TAR_VERSION_LEN 2
53 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
55 struct TarHeader { /* byte offset */
56 char name[NAME_SIZE]; /* 0-99 */
57 char mode[8]; /* 100-107 */
58 char uid[8]; /* 108-115 */
59 char gid[8]; /* 116-123 */
60 char size[12]; /* 124-135 */
61 char mtime[12]; /* 136-147 */
62 char chksum[8]; /* 148-155 */
63 char typeflag; /* 156-156 */
64 char linkname[NAME_SIZE]; /* 157-256 */
65 char magic[6]; /* 257-262 */
66 char version[2]; /* 263-264 */
67 char uname[32]; /* 265-296 */
68 char gname[32]; /* 297-328 */
69 char devmajor[8]; /* 329-336 */
70 char devminor[8]; /* 337-344 */
71 char prefix[155]; /* 345-499 */
72 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
74 typedef struct TarHeader TarHeader;
77 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
78 ** the only functions that deal with the HardLinkInfo structure.
79 ** Even these functions use the xxxHardLinkInfo() functions.
81 typedef struct HardLinkInfo HardLinkInfo;
83 HardLinkInfo *next; /* Next entry in list */
84 dev_t dev; /* Device number */
85 ino_t ino; /* Inode number */
86 short linkCount; /* (Hard) Link Count */
87 char name[1]; /* Start of filename (must be last) */
90 /* Some info to be carried along when creating a new tarball */
92 char *fileName; /* File name of the tarball */
93 int tarFd; /* Open-for-write file descriptor
95 struct stat statBuf; /* Stat info for the tarball, letting
96 us know the inode and device that the
97 tarball lives, so we can avoid trying
98 to include the tarball into itself */
99 int verboseFlag; /* Whether to print extra stuff or not */
100 const llist_t *excludeList; /* List of files to not include */
101 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
102 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
104 typedef struct TarBallInfo TarBallInfo;
106 /* A nice enum with all the possible tar file content types */
108 REGTYPE = '0', /* regular file */
109 REGTYPE0 = '\0', /* regular file (ancient bug compat) */
110 LNKTYPE = '1', /* hard link */
111 SYMTYPE = '2', /* symbolic link */
112 CHRTYPE = '3', /* character special */
113 BLKTYPE = '4', /* block special */
114 DIRTYPE = '5', /* directory */
115 FIFOTYPE = '6', /* FIFO special */
116 CONTTYPE = '7', /* reserved */
117 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
118 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
120 typedef enum TarFileType TarFileType;
122 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
123 static inline void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
124 struct stat *statbuf,
127 /* Note: hlInfoHeadPtr can never be NULL! */
128 HardLinkInfo *hlInfo;
130 hlInfo = (HardLinkInfo *) xmalloc(sizeof(HardLinkInfo) + strlen(name));
131 hlInfo->next = *hlInfoHeadPtr;
132 *hlInfoHeadPtr = hlInfo;
133 hlInfo->dev = statbuf->st_dev;
134 hlInfo->ino = statbuf->st_ino;
135 hlInfo->linkCount = statbuf->st_nlink;
136 strcpy(hlInfo->name, name);
139 static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
141 HardLinkInfo *hlInfo = NULL;
142 HardLinkInfo *hlInfoNext = NULL;
145 hlInfo = *hlInfoHeadPtr;
147 hlInfoNext = hlInfo->next;
151 *hlInfoHeadPtr = NULL;
156 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
157 static inline HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf)
160 if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
162 hlInfo = hlInfo->next;
167 /* Put an octal string into the specified buffer.
168 * The number is zero and space padded and possibly null padded.
169 * Returns TRUE if successful. */
170 static int putOctal(char *cp, int len, long value)
174 char *tempString = tempBuffer;
176 /* Create a string of the specified length with an initial space,
177 * leading zeroes and the octal number, and a trailing null. */
178 sprintf(tempString, "%0*lo", len - 1, value);
180 /* If the string is too large, suppress the leading space. */
181 tempLength = strlen(tempString) + 1;
182 if (tempLength > len) {
187 /* If the string is still too large, suppress the trailing null. */
188 if (tempLength > len)
191 /* If the string is still too large, fail. */
192 if (tempLength > len)
195 /* Copy the string to the field. */
196 memcpy(cp, tempString, len);
201 /* Write out a tar header for the specified file/directory/whatever */
202 static inline int writeTarHeader(struct TarBallInfo *tbInfo,
203 const char *header_name, const char *real_name, struct stat *statbuf)
206 struct TarHeader header;
207 const unsigned char *cp = (const unsigned char *) &header;
208 ssize_t size = sizeof(struct TarHeader);
210 memset(&header, 0, size);
212 strncpy(header.name, header_name, sizeof(header.name));
214 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
215 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
216 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
217 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
218 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
219 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
220 TAR_MAGIC_LEN + TAR_VERSION_LEN);
222 /* Enter the user and group names (default to root if it fails) */
223 if (bb_getpwuid(header.uname, statbuf->st_uid, sizeof(header.uname)) == NULL)
224 strcpy(header.uname, "root");
225 if (bb_getgrgid(header.gname, statbuf->st_gid, sizeof(header.gname)) == NULL)
226 strcpy(header.gname, "root");
228 if (tbInfo->hlInfo) {
229 /* This is a hard link */
230 header.typeflag = LNKTYPE;
231 strncpy(header.linkname, tbInfo->hlInfo->name,
232 sizeof(header.linkname));
233 } else if (S_ISLNK(statbuf->st_mode)) {
234 char *lpath = xreadlink(real_name);
236 if (!lpath) /* Already printed err msg inside xreadlink() */
238 header.typeflag = SYMTYPE;
239 strncpy(header.linkname, lpath, sizeof(header.linkname));
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", real_name);
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;
275 putOctal(header.chksum, 7, chksum);
277 /* Now write the header out to disk */
279 bb_full_write(tbInfo->tarFd, (char *) &header,
280 sizeof(struct TarHeader))) < 0) {
281 bb_error_msg(bb_msg_io_error, real_name);
284 /* Pad the header up to the tar block size */
285 for (; size < TAR_BLOCK_SIZE; size++) {
286 write(tbInfo->tarFd, "\0", 1);
288 /* Now do the verbose thing (or not) */
290 if (tbInfo->verboseFlag) {
293 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
296 fprintf(vbFd, "%s\n", header.name);
302 # ifdef CONFIG_FEATURE_TAR_FROM
303 static inline int exclude_file(const llist_t *excluded_files, const char *file)
305 while (excluded_files) {
306 if (excluded_files->data[0] == '/') {
307 if (fnmatch(excluded_files->data, file,
308 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
313 for (p = file; p[0] != '\0'; p++) {
314 if ((p == file || p[-1] == '/') && p[0] != '/' &&
315 fnmatch(excluded_files->data, p,
316 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
320 excluded_files = excluded_files->link;
326 #define exclude_file(excluded_files, file) 0
329 static int writeFileToTarball(const char *fileName, struct stat *statbuf,
332 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
333 const char *header_name;
334 int inputFileFd = -1;
337 ** Check to see if we are dealing with a hard link.
339 ** Treat the first occurance of a given dev/inode as a file while
340 ** treating any additional occurances as hard links. This is done
341 ** by adding the file information to the HardLinkInfo linked list.
343 tbInfo->hlInfo = NULL;
344 if (statbuf->st_nlink > 1) {
345 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
346 if (tbInfo->hlInfo == NULL)
347 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName);
350 /* It is against the rules to archive a socket */
351 if (S_ISSOCK(statbuf->st_mode)) {
352 bb_error_msg("%s: socket ignored", fileName);
356 /* It is a bad idea to store the archive we are in the process of creating,
357 * so check the device and inode to be sure that this particular file isn't
359 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
360 tbInfo->statBuf.st_ino == statbuf->st_ino) {
361 bb_error_msg("%s: file is the archive; skipping", fileName);
365 header_name = fileName;
366 while (header_name[0] == '/') {
367 static int alreadyWarned = FALSE;
369 if (alreadyWarned == FALSE) {
370 bb_error_msg("Removing leading '/' from member names");
371 alreadyWarned = TRUE;
376 if (strlen(fileName) >= NAME_SIZE) {
377 bb_error_msg(bb_msg_name_longer_than_foo, NAME_SIZE);
381 if (header_name[0] == '\0')
384 if (ENABLE_FEATURE_TAR_FROM &&
385 exclude_file(tbInfo->excludeList, header_name)) {
389 /* Is this a regular file? */
390 if ((tbInfo->hlInfo == NULL) && (S_ISREG(statbuf->st_mode))) {
392 /* open the file we want to archive, and make sure all is well */
393 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
394 bb_perror_msg("%s: Cannot open", fileName);
399 /* Add an entry to the tarball */
400 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
404 /* If it was a regular file, write out the body */
405 if (inputFileFd >= 0 ) {
406 ssize_t readSize = 0;
408 /* write the file to the archive */
409 readSize = bb_copyfd_eof(inputFileFd, tbInfo->tarFd);
412 /* Pad the file up to the tar block size */
413 for (; (readSize % TAR_BLOCK_SIZE) != 0; readSize++)
414 write(tbInfo->tarFd, "\0", 1);
420 static inline int writeTarFile(const int tar_fd, const int verboseFlag,
421 const unsigned long dereferenceFlag, const llist_t *include,
422 const llist_t *exclude, const int gzip)
426 int errorFlag = FALSE;
428 struct TarBallInfo tbInfo;
430 tbInfo.hlInfoHead = NULL;
432 fchmod(tar_fd, 0644);
433 tbInfo.tarFd = tar_fd;
434 tbInfo.verboseFlag = verboseFlag;
436 /* Store the stat info for the tarball's file, so
437 * can avoid including the tarball into itself.... */
438 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
439 bb_perror_msg_and_die("Couldnt stat tar file");
441 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
442 int gzipDataPipe[2] = { -1, -1 };
443 int gzipStatusPipe[2] = { -1, -1 };
444 volatile int vfork_exec_errno = 0;
445 char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
448 if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0)
449 bb_perror_msg_and_die("create pipe");
451 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
454 /* Avoid vfork clobbering */
463 dup2(gzipDataPipe[0], 0);
464 close(gzipDataPipe[1]);
466 if (tbInfo.tarFd != 1)
467 dup2(tbInfo.tarFd, 1);
469 close(gzipStatusPipe[0]);
470 fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */
472 execlp(zip_exec, zip_exec, "-f", NULL);
473 vfork_exec_errno = errno;
475 close(gzipStatusPipe[1]);
477 } else if (gzipPid > 0) {
478 close(gzipDataPipe[0]);
479 close(gzipStatusPipe[1]);
484 int n = bb_full_read(gzipStatusPipe[0], &buf, 1);
486 if (n == 0 && vfork_exec_errno != 0) {
487 errno = vfork_exec_errno;
488 bb_perror_msg_and_die("Could not exec %s", zip_exec);
489 } else if ((n < 0) && (errno == EAGAIN || errno == EINTR))
490 continue; /* try it again */
493 close(gzipStatusPipe[0]);
495 tbInfo.tarFd = gzipDataPipe[1];
496 } else bb_perror_msg_and_die("vfork gzip");
499 tbInfo.excludeList = exclude;
501 /* Read the directory/files and iterate over them one at a time */
503 if (!recursive_action(include->data, TRUE, dereferenceFlag,
504 FALSE, writeFileToTarball, writeFileToTarball, &tbInfo))
508 include = include->link;
510 /* Write two empty blocks to the end of the archive */
511 for (size = 0; size < (2 * TAR_BLOCK_SIZE); size++)
512 write(tbInfo.tarFd, "\0", 1);
514 /* To be pedantically correct, we would check if the tarball
515 * is smaller than 20 tar blocks, and pad it if it was smaller,
516 * but that isn't necessary for GNU tar interoperability, and
517 * so is considered a waste of space */
519 /* Close so the child process (if any) will exit */
522 /* Hang up the tools, close up shop, head home */
523 if (ENABLE_FEATURE_CLEAN_UP)
524 freeHardLinkInfo(&tbInfo.hlInfoHead);
527 bb_error_msg("Error exit delayed from previous errors");
529 if (gzipPid && waitpid(gzipPid, NULL, 0)==-1)
530 bb_error_msg("Couldnt wait");
535 int writeTarFile(const int tar_fd, const int verboseFlag,
536 const unsigned long dereferenceFlag, const llist_t *include,
537 const llist_t *exclude, const int gzip);
538 #endif /* tar_create */
540 #ifdef CONFIG_FEATURE_TAR_FROM
541 static llist_t *append_file_list_to_list(llist_t *list)
547 llist_t *newlist = NULL;
550 src_stream = bb_xfopen(cur->data, "r");
554 while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL)
555 newlist = llist_add_to(newlist, line);
561 #define append_file_list_to_list(x) 0
564 #ifdef CONFIG_FEATURE_TAR_COMPRESS
565 static char get_header_tar_Z(archive_handle_t *archive_handle)
567 /* Cant lseek over pipe's */
568 archive_handle->seek = seek_by_char;
570 /* do the decompression, and cleanup */
571 if (bb_xread_char(archive_handle->src_fd) != 0x1f ||
572 bb_xread_char(archive_handle->src_fd) != 0x9d)
574 bb_error_msg_and_die("Invalid magic");
577 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress);
578 archive_handle->offset = 0;
579 while (get_header_tar(archive_handle) == EXIT_SUCCESS);
581 /* Can only do one file at a time */
582 return(EXIT_FAILURE);
585 #define get_header_tar_Z 0
588 #define CTX_TEST (1 << 0)
589 #define CTX_EXTRACT (1 << 1)
590 #define TAR_OPT_BASEDIR (1 << 2)
591 #define TAR_OPT_TARNAME (1 << 3)
592 #define TAR_OPT_2STDOUT (1 << 4)
593 #define TAR_OPT_P (1 << 5)
594 #define TAR_OPT_VERBOSE (1 << 6)
595 #define TAR_OPT_KEEP_OLD (1 << 7)
597 #define TAR_OPT_AFTER_START 8
599 #define CTX_CREATE (1 << (TAR_OPT_AFTER_START))
600 #define TAR_OPT_DEREFERNCE (1 << (TAR_OPT_AFTER_START + 1))
601 #ifdef CONFIG_FEATURE_TAR_CREATE
602 # define TAR_OPT_STR_CREATE "ch"
603 # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START + 2
605 # define TAR_OPT_STR_CREATE ""
606 # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START
609 #define TAR_OPT_BZIP2 (1 << (TAR_OPT_AFTER_CREATE))
610 #ifdef CONFIG_FEATURE_TAR_BZIP2
611 # define TAR_OPT_STR_BZIP2 "j"
612 # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE + 1
614 # define TAR_OPT_STR_BZIP2 ""
615 # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE
618 #define TAR_OPT_LZMA (1 << (TAR_OPT_AFTER_BZIP2))
619 #ifdef CONFIG_FEATURE_TAR_LZMA
620 # define TAR_OPT_STR_LZMA "a"
621 # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2 + 1
623 # define TAR_OPT_STR_LZMA ""
624 # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2
627 #define TAR_OPT_INCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA))
628 #define TAR_OPT_EXCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA + 1))
629 #ifdef CONFIG_FEATURE_TAR_FROM
630 # define TAR_OPT_STR_FROM "T:X:"
631 # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA + 2
633 # define TAR_OPT_STR_FROM ""
634 # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA
637 #define TAR_OPT_GZIP (1 << (TAR_OPT_AFTER_FROM))
638 #ifdef CONFIG_FEATURE_TAR_GZIP
639 # define TAR_OPT_STR_GZIP "z"
640 # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM + 1
642 # define TAR_OPT_STR_GZIP ""
643 # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM
646 #define TAR_OPT_UNCOMPRESS (1 << (TAR_OPT_AFTER_GZIP))
647 #ifdef CONFIG_FEATURE_TAR_COMPRESS
648 # define TAR_OPT_STR_COMPRESS "Z"
649 # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP + 1
651 # define TAR_OPT_STR_COMPRESS ""
652 # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP
655 #define TAR_OPT_NOPRESERVE_OWN (1 << (TAR_OPT_AFTER_COMPRESS))
656 #define TAR_OPT_NOPRESERVE_PERM (1 << (TAR_OPT_AFTER_COMPRESS + 1))
657 #define TAR_OPT_STR_NOPRESERVE "\203\213"
658 #define TAR_OPT_AFTER_NOPRESERVE TAR_OPT_AFTER_COMPRESS + 2
660 static const char tar_options[]="txC:f:Opvk" \
666 TAR_OPT_STR_COMPRESS \
667 TAR_OPT_STR_NOPRESERVE;
669 #ifdef CONFIG_FEATURE_TAR_LONG_OPTIONS
670 static const struct option tar_long_options[] = {
671 { "list", 0, NULL, 't' },
672 { "extract", 0, NULL, 'x' },
673 { "directory", 1, NULL, 'C' },
674 { "file", 1, NULL, 'f' },
675 { "to-stdout", 0, NULL, 'O' },
676 { "same-permissions", 0, NULL, 'p' },
677 { "verbose", 0, NULL, 'v' },
678 { "keep-old", 0, NULL, 'k' },
679 { "no-same-owner", 0, NULL, '\203' },
680 { "no-same-permissions",0, NULL, '\213' },
681 # ifdef CONFIG_FEATURE_TAR_CREATE
682 { "create", 0, NULL, 'c' },
683 { "dereference", 0, NULL, 'h' },
685 # ifdef CONFIG_FEATURE_TAR_BZIP2
686 { "bzip2", 0, NULL, 'j' },
688 # ifdef CONFIG_FEATURE_TAR_LZMA
689 { "lzma", 0, NULL, 'a' },
691 # ifdef CONFIG_FEATURE_TAR_FROM
692 { "files-from", 1, NULL, 'T' },
693 { "exclude-from", 1, NULL, 'X' },
694 { "exclude", 1, NULL, '\n' },
696 # ifdef CONFIG_FEATURE_TAR_GZIP
697 { "gzip", 0, NULL, 'z' },
699 # ifdef CONFIG_FEATURE_TAR_COMPRESS
700 { "compress", 0, NULL, 'Z' },
705 #define tar_long_options 0
708 int tar_main(int argc, char **argv)
710 char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
711 archive_handle_t *tar_handle;
712 char *base_dir = NULL;
713 const char *tar_filename = "-";
715 llist_t *excludes = NULL;
717 /* Initialise default values */
718 tar_handle = init_handle();
719 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL;
721 /* Prepend '-' to the first argument if required */
722 bb_opt_complementally = ENABLE_FEATURE_TAR_CREATE ?
723 "--:X::T::\n::c:t:x:?:c--tx:t--cx:x--ct" :
724 "--:X::T::\n::t:x:?:t--x:x--t";
725 if (ENABLE_FEATURE_TAR_LONG_OPTIONS)
726 bb_applet_long_options = tar_long_options;
727 opt = bb_getopt_ulflags(argc, argv, tar_options,
728 &base_dir, /* Change to dir <optarg> */
729 &tar_filename /* archive filename */
730 #ifdef CONFIG_FEATURE_TAR_FROM
731 , &(tar_handle->accept),
732 &(tar_handle->reject),
737 if (opt & CTX_TEST) {
738 if ((tar_handle->action_header == header_list) ||
739 (tar_handle->action_header == header_verbose_list))
741 tar_handle->action_header = header_verbose_list;
742 } else tar_handle->action_header = header_list;
744 if((opt & CTX_EXTRACT) && tar_handle->action_data != data_extract_to_stdout)
745 tar_handle->action_data = data_extract_all;
747 if (opt & TAR_OPT_2STDOUT)
748 tar_handle->action_data = data_extract_to_stdout;
750 if (opt & TAR_OPT_VERBOSE) {
751 if ((tar_handle->action_header == header_list) ||
752 (tar_handle->action_header == header_verbose_list))
754 tar_handle->action_header = header_verbose_list;
756 tar_handle->action_header = header_list;
758 if (opt & TAR_OPT_KEEP_OLD)
759 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
761 if (opt & TAR_OPT_NOPRESERVE_OWN)
762 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
764 if (opt & TAR_OPT_NOPRESERVE_PERM)
765 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
767 if (ENABLE_FEATURE_TAR_GZIP && (opt & TAR_OPT_GZIP))
768 get_header_ptr = get_header_tar_gz;
770 if (ENABLE_FEATURE_TAR_BZIP2 && (opt & TAR_OPT_BZIP2))
771 get_header_ptr = get_header_tar_bz2;
773 if (ENABLE_FEATURE_TAR_LZMA && (opt & TAR_OPT_LZMA))
774 get_header_ptr = get_header_tar_lzma;
776 if (ENABLE_FEATURE_TAR_COMPRESS && (opt & TAR_OPT_UNCOMPRESS))
777 get_header_ptr = get_header_tar_Z;
779 if (ENABLE_FEATURE_TAR_FROM) {
780 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
781 /* Append excludes to reject */
783 llist_t *temp = excludes->link;
784 excludes->link = tar_handle->reject;
785 tar_handle->reject = excludes;
788 tar_handle->accept = append_file_list_to_list(tar_handle->accept);
791 /* Check if we are reading from stdin */
792 if (argv[optind] && *argv[optind] == '-') {
793 /* Default is to read from stdin, so just skip to next arg */
797 /* Setup an array of filenames to work with */
798 /* TODO: This is the same as in ar, separate function ? */
799 while (optind < argc) {
800 char *filename_ptr = last_char_is(argv[optind], '/');
801 if (filename_ptr > argv[optind])
802 *filename_ptr = '\0';
804 tar_handle->accept = llist_add_to(tar_handle->accept, argv[optind]);
808 if ((tar_handle->accept) || (tar_handle->reject))
809 tar_handle->filter = filter_accept_reject_list;
811 /* Open the tar file */
816 if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
817 /* Make sure there is at least one file to tar up. */
818 if (tar_handle->accept == NULL)
819 bb_error_msg_and_die("empty archive");
822 flags = O_WRONLY | O_CREAT | O_EXCL;
823 unlink(tar_filename);
829 if ((tar_filename[0] == '-') && (tar_filename[1] == '\0')) {
830 tar_handle->src_fd = fileno(tar_stream);
831 tar_handle->seek = seek_by_char;
833 tar_handle->src_fd = bb_xopen(tar_filename, flags);
837 if ((base_dir) && (chdir(base_dir)))
838 bb_perror_msg_and_die("Couldnt chdir to %s", base_dir);
840 /* create an archive */
841 if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
842 int verboseFlag = FALSE;
845 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
847 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
850 if ((tar_handle->action_header == header_list) ||
851 (tar_handle->action_header == header_verbose_list))
855 writeTarFile(tar_handle->src_fd, verboseFlag, opt & TAR_OPT_DEREFERNCE, tar_handle->accept,
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);