1 /* vi: set sw=4 ts=4: */
3 * Mini tar implementation for busybox
5 * Note, that as of BusyBox 0.43 tar has been completely rewritten from the
6 * ground up. It still has remnents of the old code lying about, but it pretty
7 * different (i.e. cleaner, less global variables, etc)
9 * Copyright (C) 2000 by Lineo, inc.
10 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
12 * Based in part in the tar implementation in sash
13 * Copyright (c) 1999 by David I. Bell
14 * Permission is granted to use, distribute, or modify this source,
15 * provided that this copyright notice remains intact.
16 * Permission to distribute sash derived code under the GPL has been granted.
18 * Based in part on the tar implementation from busybox-0.28
19 * Copyright (C) 1995 Bruce Perens
20 * This is free software under the GNU General Public License.
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2 of the License, or
25 * (at your option) any later version.
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30 * General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
40 #define BB_DECLARE_EXTERN
41 #define bb_need_io_error
50 #include <sys/types.h>
51 #include <sys/sysmacros.h>
52 #include <sys/param.h> /* for PATH_MAX */
55 #ifdef BB_FEATURE_TAR_CREATE
57 static const char tar_usage[] =
58 "tar -[cxtvOf] [tarFileName] [FILE] ...\n\n"
59 "Create, extract, or list files from a tar file. Note that\n"
60 "this version of tar packs hard links as separate files.\n\n"
63 "\tc=create, x=extract, t=list contents, v=verbose,\n"
64 "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
68 static const char tar_usage[] =
69 "tar -[xtvOf] [tarFileName] [FILE] ...\n\n"
70 "Extract, or list files stored in a tar file. This\n"
71 "version of tar does not support creation of tar files.\n\n"
74 "\tx=extract, t=list contents, v=verbose,\n"
75 "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
80 /* Tar file constants */
82 #define MAJOR(dev) (((dev)>>8)&0xff)
83 #define MINOR(dev) ((dev)&0xff)
87 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
91 char name[100]; /* 0 */
92 char mode[8]; /* 100 */
93 char uid[8]; /* 108 */
94 char gid[8]; /* 116 */
95 char size[12]; /* 124 */
96 char mtime[12]; /* 136 */
97 char chksum[8]; /* 148 */
98 char typeflag; /* 156 */
99 char linkname[100]; /* 157 */
100 char magic[6]; /* 257 */
101 char version[2]; /* 263 */
102 char uname[32]; /* 265 */
103 char gname[32]; /* 297 */
104 char devmajor[8]; /* 329 */
105 char devminor[8]; /* 337 */
106 char prefix[155]; /* 345 */
109 typedef struct TarHeader TarHeader;
112 /* A few useful constants */
113 #define TAR_MAGIC "ustar" /* ustar and a null */
114 //#define TAR_VERSION "00" /* 00 and no null */
115 #define TAR_VERSION " " /* Be compatable with old GNU format */
116 #define TAR_MAGIC_LEN 6
117 #define TAR_VERSION_LEN 2
118 #define TAR_BLOCK_SIZE 512
120 /* A nice enum with all the possible tar file content types */
123 REGTYPE = '0', /* regular file */
124 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
125 LNKTYPE = '1', /* hard link */
126 SYMTYPE = '2', /* symbolic link */
127 CHRTYPE = '3', /* character special */
128 BLKTYPE = '4', /* block special */
129 DIRTYPE = '5', /* directory */
130 FIFOTYPE = '6', /* FIFO special */
131 CONTTYPE = '7', /* reserved */
133 typedef enum TarFileType TarFileType;
135 /* This struct ignores magic, non-numeric user name,
136 * non-numeric group name, and the checksum, since
137 * these are all ignored by BusyBox tar. */
140 int tarFd; /* An open file descriptor for reading from the tarball */
141 char * name; /* File name */
142 mode_t mode; /* Unix mode, including device bits. */
143 uid_t uid; /* Numeric UID */
144 gid_t gid; /* Numeric GID */
145 size_t size; /* Size of file */
146 time_t mtime; /* Last-modified time */
147 enum TarFileType type; /* Regular, directory, link, etc */
148 char * linkname; /* Name for symbolic and hard links */
149 long devmajor; /* Major number for special device */
150 long devminor; /* Minor number for special device */
152 typedef struct TarInfo TarInfo;
155 static const unsigned long TarChecksumOffset = (const unsigned long)&(((TarHeader *)0)->chksum);
158 /* Local procedures to restore files from a tar file. */
159 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
160 int tostdoutFlag, int verboseFlag);
164 #ifdef BB_FEATURE_TAR_CREATE
165 /* Local procedures to save files into a tar file. */
166 static int writeTarFile(const char* tarName, int tostdoutFlag,
167 int verboseFlag, int argc, char **argv);
168 static int putOctal(char *cp, int len, long value);
173 extern int tar_main(int argc, char **argv)
175 const char *tarName=NULL;
177 int listFlag = FALSE;
178 int extractFlag = FALSE;
179 int createFlag = FALSE;
180 int verboseFlag = FALSE;
181 int tostdoutFlag = FALSE;
191 options = (*argv++) + 1;
196 for (; *options; options++) {
200 fatalError( "Only one 'f' option allowed\n");
204 fatalError( "Option requires an argument: No file specified\n");
210 if (extractFlag == TRUE || createFlag == TRUE)
216 if (listFlag == TRUE || createFlag == TRUE)
221 if (extractFlag == TRUE || listFlag == TRUE)
240 fatalError( "Unknown tar flag '%c'\n"
241 "Try `tar --help' for more information\n", *options);
246 * Do the correct type of action supplying the rest of the
247 * command line arguments as the list of files to process.
249 if (createFlag == TRUE) {
250 #ifndef BB_FEATURE_TAR_CREATE
251 fatalError( "This version of tar was not compiled with tar creation support.\n");
253 exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv));
256 exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag));
260 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
264 fixUpPermissions(TarInfo *header)
267 /* Now set permissions etc for the new file */
268 chown(header->name, header->uid, header->gid);
269 chmod(header->name, header->mode);
272 t.modtime = header->mtime;
273 utime(header->name, &t);
277 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
281 size_t actualWriteSz;
283 size_t size = header->size;
284 int outFd=fileno(stdout);
286 /* Open the file to be written, if a file is supposed to be written */
287 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
288 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0)
289 errorMsg(io_error, header->name, strerror(errno));
290 /* Create the path to the file, just in case it isn't there...
291 * This should not screw up path permissions or anything. */
292 createPath(header->name, 0777);
295 /* Write out the file, if we are supposed to be doing that */
298 if ( size > sizeof(buffer) )
299 writeSize = readSize = sizeof(buffer);
301 int mod = size % 512;
303 readSize = size + (512 - mod);
308 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
309 /* Tarball seems to have a problem */
310 errorMsg("tar: Unexpected EOF in archive\n");
313 if ( readSize < writeSize )
314 writeSize = readSize;
316 /* Write out the file, if we are supposed to be doing that */
317 if (extractFlag==TRUE) {
319 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
320 /* Output file seems to have a problem */
321 errorMsg(io_error, header->name, strerror(errno));
326 size -= actualWriteSz;
329 /* Now we are done writing the file out, so try
330 * and fix up the permissions and whatnot */
331 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
333 fixUpPermissions(header);
339 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
342 if (extractFlag==FALSE || tostdoutFlag==TRUE)
345 if (createPath(header->name, header->mode) != TRUE) {
346 errorMsg("tar: %s: Cannot mkdir: %s\n",
347 header->name, strerror(errno));
350 /* make the final component, just in case it was
351 * omitted by createPath() (which will skip the
352 * directory if it doesn't have a terminating '/') */
353 if (mkdir(header->name, header->mode) == 0) {
354 fixUpPermissions(header);
360 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
362 if (extractFlag==FALSE || tostdoutFlag==TRUE)
365 if (link(header->linkname, header->name) < 0) {
366 errorMsg("tar: %s: Cannot create hard link to '%s': %s\n",
367 header->name, header->linkname, strerror(errno));
371 /* Now set permissions etc for the new directory */
372 fixUpPermissions(header);
377 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
379 if (extractFlag==FALSE || tostdoutFlag==TRUE)
383 if (symlink(header->linkname, header->name) < 0) {
384 errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
385 header->name, header->linkname, strerror(errno));
388 /* Try to change ownership of the symlink.
389 * If libs doesn't support that, don't bother.
390 * Changing the pointed-to-file is the Wrong Thing(tm).
392 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
393 lchown(header->name, header->uid, header->gid);
396 /* Do not change permissions or date on symlink,
397 * since it changes the pointed to file instead. duh. */
399 errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
400 header->name, header->linkname,
401 "symlinks not supported");
407 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
409 if (extractFlag==FALSE || tostdoutFlag==TRUE)
412 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
413 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
414 errorMsg("tar: %s: Cannot mknod: %s\n",
415 header->name, strerror(errno));
418 } else if (S_ISFIFO(header->mode)) {
419 if (mkfifo(header->name, header->mode) < 0) {
420 errorMsg("tar: %s: Cannot mkfifo: %s\n",
421 header->name, strerror(errno));
426 /* Now set permissions etc for the new directory */
427 fixUpPermissions(header);
431 /* Read an octal value in a field of the specified width, with optional
432 * spaces on both sides of the number and with an optional null character
433 * at the end. Returns -1 on an illegal format. */
434 static long getOctal(const char *cp, int size)
438 for(;(size > 0) && (*cp == ' '); cp++, size--);
439 if ((size == 0) || !isOctal(*cp))
441 for(; (size > 0) && isOctal(*cp); size--) {
442 val = val * 8 + *cp++ - '0';
444 for (;(size > 0) && (*cp == ' '); cp++, size--);
445 if ((size > 0) && *cp)
451 /* Parse the tar header and fill in the nice struct with the details */
453 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
457 unsigned char *s = (unsigned char *)rawHeader;
459 header->name = rawHeader->name;
460 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
461 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
462 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
463 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
464 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
465 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
466 header->type = rawHeader->typeflag;
467 header->linkname = rawHeader->linkname;
468 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
469 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
471 /* Check the checksum */
472 sum = ' ' * sizeof(rawHeader->chksum);
473 for ( i = TarChecksumOffset; i > 0; i-- )
475 s += sizeof(rawHeader->chksum);
476 for ( i = (512 - TarChecksumOffset - sizeof(rawHeader->chksum)); i > 0; i-- )
485 * Read a tar file and extract or list the specified files within it.
486 * If the list is empty than all files are extracted or listed.
488 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
489 int tostdoutFlag, int verboseFlag)
495 int alreadyWarned=FALSE;
496 //int skipFileFlag=FALSE;
498 /* Open the tar file for reading. */
499 if (!strcmp(tarName, "-"))
500 tarFd = fileno(stdin);
502 tarFd = open(tarName, O_RDONLY);
504 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
508 /* Set the umask for this process so it doesn't
509 * screw up permission setting for us later. */
512 /* Read the tar file, and iterate over it one file at a time */
513 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
515 /* First, try to read the header */
516 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
518 if ( *(header.name) == '\0' ) {
522 errorMsg("Bad tar header, skipping\n");
526 if ( *(header.name) == '\0' )
529 /* Check for and relativify any absolute paths */
530 if ( *(header.name) == '/' ) {
532 while (*(header.name) == '/')
535 if (alreadyWarned == FALSE) {
536 errorMsg("Absolute path detected, removing leading slashes\n");
537 alreadyWarned = TRUE;
541 /* Special treatment if the list (-t) flag is on */
542 if (verboseFlag == TRUE && extractFlag == FALSE) {
545 struct tm *tm = localtime (&(header.mtime));
547 len=printf("%s ", modeString(header.mode));
548 memset(buf, 0, 8*sizeof(char));
549 my_getpwuid(buf, header.uid);
551 len+=printf("%d", header.uid);
553 len+=printf("%s", buf);
554 memset(buf, 0, 8*sizeof(char));
555 my_getgrgid(buf, header.gid);
557 len+=printf("/%-d ", header.gid);
559 len+=printf("/%-s ", buf);
561 if (header.type==CHRTYPE || header.type==BLKTYPE) {
562 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
563 header.devmajor, header.devminor);
565 len1=snprintf(buf, sizeof(buf), "%d ", header.size);
567 /* Jump through some hoops to make the columns match up */
568 for(;(len+len1)<31;len++)
572 /* Use ISO 8610 time format */
574 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
575 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
576 tm->tm_hour, tm->tm_min, tm->tm_sec);
579 /* List contents if we are supposed to do that */
580 if (verboseFlag == TRUE || listFlag == TRUE) {
581 /* Now the normal listing */
582 printf("%s", header.name);
584 if (verboseFlag == TRUE && listFlag == TRUE) {
585 /* If this is a link, say so */
586 if (header.type==LNKTYPE)
587 printf(" link to %s", header.linkname);
588 else if (header.type==SYMTYPE)
589 printf(" -> %s", header.linkname);
591 if (verboseFlag == TRUE || listFlag == TRUE) {
596 /* See if we want to restore this file or not */
598 if (wantFileName(outName) == FALSE) {
602 /* Remove any clutter lying in our way */
603 unlink( header.name);
605 /* If we got here, we can be certain we have a legitimate
606 * header to work with. So work with it. */
607 switch ( header.type ) {
610 /* If the name ends in a '/' then assume it is
611 * supposed to be a directory, and fall through */
612 if (header.name[strlen(header.name)-1] != '/') {
613 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
618 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
622 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
626 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
632 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
642 /* Bummer - we read a partial header */
643 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
646 else if (errorFlag==TRUE) {
647 errorMsg( "tar: Error exit delayed from previous errors\n");
652 /* Stuff to do when we are done */
655 if ( *(header.name) == '\0' ) {
657 errorMsg( "tar: Error exit delayed from previous errors\n");
665 #ifdef BB_FEATURE_TAR_CREATE
667 /* Some info to be carried along when creating a new tarball */
670 char* fileName; /* File name of the tarball */
671 int tarFd; /* Open-for-write file descriptor
673 struct stat statBuf; /* Stat info for the tarball, letting
674 us know the inode and device that the
675 tarball lives, so we can avoid trying
676 to include the tarball into itself */
677 int verboseFlag; /* Whether to print extra stuff or not */
679 typedef struct TarBallInfo TarBallInfo;
682 /* Put an octal string into the specified buffer.
683 * The number is zero and space padded and possibly null padded.
684 * Returns TRUE if successful. */
685 static int putOctal (char *cp, int len, long value)
689 char *tempString = tempBuffer;
691 /* Create a string of the specified length with an initial space,
692 * leading zeroes and the octal number, and a trailing null. */
693 sprintf (tempString, "%0*lo", len - 1, value);
695 /* If the string is too large, suppress the leading space. */
696 tempLength = strlen (tempString) + 1;
697 if (tempLength > len) {
702 /* If the string is still too large, suppress the trailing null. */
703 if (tempLength > len)
706 /* If the string is still too large, fail. */
707 if (tempLength > len)
710 /* Copy the string to the field. */
711 memcpy (cp, tempString, len);
716 /* Write out a tar header for the specified file/directory/whatever */
718 writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
721 struct TarHeader header;
722 const unsigned char *cp = (const unsigned char *) &header;
723 ssize_t size = sizeof(struct TarHeader);
725 memset( &header, 0, size);
727 if (*fileName=='/') {
728 static int alreadyWarned=FALSE;
729 if (alreadyWarned==FALSE) {
730 errorMsg("tar: Removing leading '/' from member names\n");
733 strcpy(header.name, fileName+1);
736 strcpy(header.name, fileName);
738 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
739 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
740 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
741 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
742 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
743 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
744 TAR_MAGIC_LEN + TAR_VERSION_LEN );
746 my_getpwuid(header.uname, statbuf->st_uid);
747 /* Put some sort of sane fallback in place... */
749 strncpy(header.uname, "root", 5);
750 my_getgrgid(header.gname, statbuf->st_gid);
752 strncpy(header.uname, "root", 5);
754 // FIXME: (or most likely not) I break Hard Links
755 if (S_ISLNK(statbuf->st_mode)) {
757 header.typeflag = SYMTYPE;
758 if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) {
759 errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
762 strncpy(header.linkname, buffer, sizeof(header.linkname));
763 } else if (S_ISDIR(statbuf->st_mode)) {
764 header.typeflag = DIRTYPE;
765 strncat(header.name, "/", sizeof(header.name));
766 } else if (S_ISCHR(statbuf->st_mode)) {
767 header.typeflag = CHRTYPE;
768 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
769 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
770 } else if (S_ISBLK(statbuf->st_mode)) {
771 header.typeflag = BLKTYPE;
772 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
773 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
774 } else if (S_ISFIFO(statbuf->st_mode)) {
775 header.typeflag = FIFOTYPE;
776 } else if (S_ISREG(statbuf->st_mode)) {
777 header.typeflag = REGTYPE;
778 putOctal(header.size, sizeof(header.size), statbuf->st_size);
780 errorMsg("tar: %s: Unknown file type\n", fileName);
784 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
785 * the header). The checksum field must be filled with blanks for the
786 * calculation. The checksum field is formatted differently from the
787 * other fields: it has [6] digits, a null, then a space -- rather than
788 * digits, followed by a null like the other fields... */
789 memset(header.chksum, ' ', sizeof(header.chksum));
790 cp = (const unsigned char *) &header;
793 putOctal(header.chksum, 7, chksum);
795 /* Now write the header out to disk */
796 if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
797 errorMsg(io_error, fileName, strerror(errno));
800 /* Pad the header up to the tar block size */
801 for (; size<TAR_BLOCK_SIZE; size++) {
802 write(tbInfo->tarFd, "\0", 1);
804 /* Now do the verbose thing (or not) */
805 if (tbInfo->verboseFlag==TRUE)
806 fprintf(stdout, "%s\n", header.name);
812 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
814 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
816 /* It is against the rules to archive a socket */
817 if (S_ISSOCK(statbuf->st_mode)) {
818 errorMsg("tar: %s: socket ignored\n", fileName);
822 /* It is a bad idea to store the archive we are in the process of creating,
823 * so check the device and inode to be sure that this particular file isn't
825 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
826 tbInfo->statBuf.st_ino == statbuf->st_ino) {
827 errorMsg("tar: %s: file is the archive; skipping\n", fileName);
831 if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
835 /* Now, if the file is a regular file, copy it out to the tarball */
836 if (S_ISREG(statbuf->st_mode)) {
839 ssize_t size=0, readSize=0;
841 /* open the file we want to archive, and make sure all is well */
842 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
843 errorMsg("tar: %s: Cannot open: %s\n", fileName, strerror(errno));
847 /* write the file to the archive */
848 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
849 if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
850 /* Output file seems to have a problem */
851 errorMsg(io_error, fileName, strerror(errno));
857 errorMsg(io_error, fileName, strerror(errno));
860 /* Pad the file up to the tar block size */
861 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
862 write(tbInfo->tarFd, "\0", 1);
870 static int writeTarFile(const char* tarName, int tostdoutFlag,
871 int verboseFlag, int argc, char **argv)
876 //int skipFileFlag=FALSE;
877 struct TarBallInfo tbInfo;
878 tbInfo.verboseFlag = verboseFlag;
880 /* Make sure there is at least one file to tar up. */
882 fatalError("tar: Cowardly refusing to create an empty archive\n");
884 /* Open the tar file for writing. */
885 if (tostdoutFlag == TRUE)
886 tbInfo.tarFd = fileno(stdout);
888 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
889 if (tbInfo.tarFd < 0) {
890 errorMsg( "tar: Error opening '%s': %s\n", tarName, strerror(errno));
893 /* Store the stat info for the tarball's file, so
894 * can avoid including the tarball into itself.... */
895 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
896 fatalError(io_error, tarName, strerror(errno));
898 /* Set the umask for this process so it doesn't
899 * screw up permission setting for us later. */
902 /* Read the directory/files and iterate over them one at a time */
904 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
905 writeFileToTarball, writeFileToTarball,
906 (void*) &tbInfo) == FALSE) {
910 /* Write two empty blocks to the end of the archive */
911 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
912 write(tbInfo.tarFd, "\0", 1);
914 /* Hang up the tools, close up shop, head home */
916 if (errorFlag == TRUE) {
917 errorMsg("tar: Error exit delayed from previous errors\n");