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 is
7 * very different now (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>
53 /* Tar file constants */
55 #define MAJOR(dev) (((dev)>>8)&0xff)
56 #define MINOR(dev) ((dev)&0xff)
60 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
64 char name[100]; /* 0-99 */
65 char mode[8]; /* 100-107 */
66 char uid[8]; /* 108-115 */
67 char gid[8]; /* 116-123 */
68 char size[12]; /* 124-135 */
69 char mtime[12]; /* 136-147 */
70 char chksum[8]; /* 148-155 */
71 char typeflag; /* 156-156 */
72 char linkname[100]; /* 157-256 */
73 char magic[6]; /* 257-262 */
74 char version[2]; /* 263-264 */
75 char uname[32]; /* 265-296 */
76 char gname[32]; /* 297-328 */
77 char devmajor[8]; /* 329-336 */
78 char devminor[8]; /* 337-344 */
79 char prefix[155]; /* 345-499 */
80 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
82 typedef struct TarHeader TarHeader;
85 /* A few useful constants */
86 #define TAR_MAGIC "ustar" /* ustar and a null */
87 #define TAR_VERSION " " /* Be compatable with GNU tar format */
88 #define TAR_MAGIC_LEN 6
89 #define TAR_VERSION_LEN 2
90 #define TAR_BLOCK_SIZE 512
92 /* A nice enum with all the possible tar file content types */
95 REGTYPE = '0', /* regular file */
96 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
97 LNKTYPE = '1', /* hard link */
98 SYMTYPE = '2', /* symbolic link */
99 CHRTYPE = '3', /* character special */
100 BLKTYPE = '4', /* block special */
101 DIRTYPE = '5', /* directory */
102 FIFOTYPE = '6', /* FIFO special */
103 CONTTYPE = '7', /* reserved */
105 typedef enum TarFileType TarFileType;
107 /* This struct ignores magic, non-numeric user name,
108 * non-numeric group name, and the checksum, since
109 * these are all ignored by BusyBox tar. */
112 int tarFd; /* An open file descriptor for reading from the tarball */
113 char * name; /* File name */
114 mode_t mode; /* Unix mode, including device bits. */
115 uid_t uid; /* Numeric UID */
116 gid_t gid; /* Numeric GID */
117 size_t size; /* Size of file */
118 time_t mtime; /* Last-modified time */
119 enum TarFileType type; /* Regular, directory, link, etc */
120 char * linkname; /* Name for symbolic and hard links */
121 long devmajor; /* Major number for special device */
122 long devminor; /* Minor number for special device */
124 typedef struct TarInfo TarInfo;
126 /* Local procedures to restore files from a tar file. */
127 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
128 int tostdoutFlag, int verboseFlag, char** excludeList);
132 #ifdef BB_FEATURE_TAR_CREATE
133 /* Local procedures to save files into a tar file. */
134 static int writeTarFile(const char* tarName, int tostdoutFlag,
135 int verboseFlag, int argc, char **argv, char** excludeList);
139 extern int tar_main(int argc, char **argv)
141 char** excludeList=NULL;
142 #if defined BB_FEATURE_TAR_EXCLUDE
143 int excludeListSize=0;
145 const char *tarName="-";
146 int listFlag = FALSE;
147 int extractFlag = FALSE;
148 int createFlag = FALSE;
149 int verboseFlag = FALSE;
150 int tostdoutFlag = FALSE;
156 /* Parse any options */
157 while (--argc > 0 && strspn(*(++argv), "-cxt") >0 ) {
159 while (stopIt==FALSE && *argv && **argv) {
163 fatalError( "Option requires an argument: No file specified\n");
166 fatalError( "Only one 'f' option allowed\n");
169 fatalError( "Option requires an argument: No file specified\n");
170 if (!strcmp(tarName, "-"))
176 if (extractFlag == TRUE || createFlag == TRUE)
182 if (listFlag == TRUE || createFlag == TRUE)
187 if (extractFlag == TRUE || listFlag == TRUE)
201 #if defined BB_FEATURE_TAR_EXCLUDE
202 if (strcmp(*argv, "-exclude")==0) {
204 fatalError( "Option requires an argument: No file specified\n");
206 excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
207 excludeList[excludeListSize] = *(++argv);
208 /* Remove leading "/"s */
209 if (*excludeList[excludeListSize] =='/') {
210 excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
212 if (excludeList[excludeListSize++] == NULL)
213 fatalError( "Option requires an argument: No file specified\n");
214 /* Tack a NULL onto the end of the list */
215 excludeList[excludeListSize] = NULL;
220 if (strcmp(*argv, "-help")==0) {
226 fatalError( "Unknown tar flag '%c'\n"
227 "Try `tar --help' for more information\n", **argv);
234 * Do the correct type of action supplying the rest of the
235 * command line arguments as the list of files to process.
237 if (createFlag == TRUE) {
238 #ifndef BB_FEATURE_TAR_CREATE
239 fatalError( "This version of tar was not compiled with tar creation support.\n");
241 exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
244 if (listFlag == TRUE || extractFlag == TRUE) {
245 exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
249 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
253 fixUpPermissions(TarInfo *header)
256 /* Now set permissions etc for the new file */
257 chown(header->name, header->uid, header->gid);
258 chmod(header->name, header->mode);
261 t.modtime = header->mtime;
262 utime(header->name, &t);
266 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
270 size_t actualWriteSz;
272 size_t size = header->size;
273 int outFd=fileno(stdout);
275 /* Open the file to be written, if a file is supposed to be written */
276 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
277 /* Create the path to the file, just in case it isn't there...
278 * This should not screw up path permissions or anything. */
279 createPath(header->name, 0777);
280 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
281 header->mode & ~S_IFMT)) < 0) {
282 errorMsg(io_error, header->name, strerror(errno));
287 /* Write out the file, if we are supposed to be doing that */
290 if ( size > sizeof(buffer) )
291 writeSize = readSize = sizeof(buffer);
293 int mod = size % 512;
295 readSize = size + (512 - mod);
300 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
301 /* Tarball seems to have a problem */
302 errorMsg("Unexpected EOF in archive\n");
305 if ( readSize < writeSize )
306 writeSize = readSize;
308 /* Write out the file, if we are supposed to be doing that */
309 if (extractFlag==TRUE) {
311 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
312 /* Output file seems to have a problem */
313 errorMsg(io_error, header->name, strerror(errno));
317 actualWriteSz=writeSize;
320 size -= actualWriteSz;
323 /* Now we are done writing the file out, so try
324 * and fix up the permissions and whatnot */
325 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
327 fixUpPermissions(header);
333 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
336 if (extractFlag==FALSE || tostdoutFlag==TRUE)
339 if (createPath(header->name, header->mode) != TRUE) {
340 errorMsg("%s: Cannot mkdir: %s\n",
341 header->name, strerror(errno));
344 /* make the final component, just in case it was
345 * omitted by createPath() (which will skip the
346 * directory if it doesn't have a terminating '/') */
347 if (mkdir(header->name, header->mode) == 0) {
348 fixUpPermissions(header);
354 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
356 if (extractFlag==FALSE || tostdoutFlag==TRUE)
359 if (link(header->linkname, header->name) < 0) {
360 errorMsg("%s: Cannot create hard link to '%s': %s\n",
361 header->name, header->linkname, strerror(errno));
365 /* Now set permissions etc for the new directory */
366 fixUpPermissions(header);
371 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
373 if (extractFlag==FALSE || tostdoutFlag==TRUE)
377 if (symlink(header->linkname, header->name) < 0) {
378 errorMsg("%s: Cannot create symlink to '%s': %s\n",
379 header->name, header->linkname, strerror(errno));
382 /* Try to change ownership of the symlink.
383 * If libs doesn't support that, don't bother.
384 * Changing the pointed-to-file is the Wrong Thing(tm).
386 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
387 lchown(header->name, header->uid, header->gid);
390 /* Do not change permissions or date on symlink,
391 * since it changes the pointed to file instead. duh. */
393 errorMsg("%s: Cannot create symlink to '%s': %s\n",
394 header->name, header->linkname,
395 "symlinks not supported");
401 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
403 if (extractFlag==FALSE || tostdoutFlag==TRUE)
406 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
407 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
408 errorMsg("%s: Cannot mknod: %s\n",
409 header->name, strerror(errno));
412 } else if (S_ISFIFO(header->mode)) {
413 if (mkfifo(header->name, header->mode) < 0) {
414 errorMsg("%s: Cannot mkfifo: %s\n",
415 header->name, strerror(errno));
420 /* Now set permissions etc for the new directory */
421 fixUpPermissions(header);
425 /* Read an octal value in a field of the specified width, with optional
426 * spaces on both sides of the number and with an optional null character
427 * at the end. Returns -1 on an illegal format. */
428 static long getOctal(const char *cp, int size)
432 for(;(size > 0) && (*cp == ' '); cp++, size--);
433 if ((size == 0) || !isOctal(*cp))
435 for(; (size > 0) && isOctal(*cp); size--) {
436 val = val * 8 + *cp++ - '0';
438 for (;(size > 0) && (*cp == ' '); cp++, size--);
439 if ((size > 0) && *cp)
445 /* Parse the tar header and fill in the nice struct with the details */
447 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
451 unsigned char *s = (unsigned char *)rawHeader;
453 header->name = rawHeader->name;
454 /* Check for and relativify any absolute paths */
455 if ( *(header->name) == '/' ) {
456 static int alreadyWarned=FALSE;
458 while (*(header->name) == '/')
461 if (alreadyWarned == FALSE) {
462 errorMsg("Removing leading '/' from member names\n");
463 alreadyWarned = TRUE;
467 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
468 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
469 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
470 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
471 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
472 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
473 header->type = rawHeader->typeflag;
474 header->linkname = rawHeader->linkname;
475 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
476 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
478 /* Check the checksum */
479 for (i = sizeof(*rawHeader); i-- != 0;) {
482 /* Remove the effects of the checksum field (replace
483 * with blanks for the purposes of the checksum) */
484 s = rawHeader->chksum;
485 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
488 sum += ' ' * sizeof(rawHeader->chksum);
496 * Read a tar file and extract or list the specified files within it.
497 * If the list is empty than all files are extracted or listed.
499 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
500 int tostdoutFlag, int verboseFlag, char** excludeList)
502 int status, tarFd=-1;
506 #if defined BB_FEATURE_TAR_EXCLUDE
510 /* Open the tar file for reading. */
511 if (!strcmp(tarName, "-"))
512 tarFd = fileno(stdin);
514 tarFd = open(tarName, O_RDONLY);
516 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
520 /* Set the umask for this process so it doesn't
521 * screw up permission setting for us later. */
524 /* Read the tar file, and iterate over it one file at a time */
525 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
527 /* First, try to read the header */
528 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
529 if ( *(header.name) == '\0' ) {
533 errorMsg("Bad tar header, skipping\n");
537 if ( *(header.name) == '\0' )
539 header.tarFd = tarFd;
541 #if defined BB_FEATURE_TAR_EXCLUDE
544 /* Check for excluded files.... */
545 for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
546 /* Do some extra hoop jumping for when directory names
547 * end in '/' but the entry in tmpList doesn't */
548 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
549 header.name[strlen(header.name)-1]=='/'
550 && strncmp( *tmpList, header.name,
551 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
552 /* If it is a regular file, pretend to extract it with
553 * the extractFlag set to FALSE, so the junk in the tarball
554 * is properly skipped over */
555 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
556 tarExtractRegularFile(&header, FALSE, FALSE);
562 /* There are not the droids you're looking for, move along */
567 /* Special treatment if the list (-t) flag is on */
568 if (verboseFlag == TRUE && extractFlag == FALSE) {
571 struct tm *tm = localtime (&(header.mtime));
573 len=printf("%s ", modeString(header.mode));
574 memset(buf, 0, 8*sizeof(char));
575 my_getpwuid(buf, header.uid);
577 len+=printf("%d", header.uid);
579 len+=printf("%s", buf);
580 memset(buf, 0, 8*sizeof(char));
581 my_getgrgid(buf, header.gid);
583 len+=printf("/%-d ", header.gid);
585 len+=printf("/%-s ", buf);
587 if (header.type==CHRTYPE || header.type==BLKTYPE) {
588 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
589 header.devmajor, header.devminor);
591 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
593 /* Jump through some hoops to make the columns match up */
594 for(;(len+len1)<31;len++)
598 /* Use ISO 8610 time format */
600 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
601 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
602 tm->tm_hour, tm->tm_min, tm->tm_sec);
605 /* List contents if we are supposed to do that */
606 if (verboseFlag == TRUE || listFlag == TRUE) {
607 /* Now the normal listing */
608 printf("%s", header.name);
610 if (verboseFlag == TRUE && listFlag == TRUE) {
611 /* If this is a link, say so */
612 if (header.type==LNKTYPE)
613 printf(" link to %s", header.linkname);
614 else if (header.type==SYMTYPE)
615 printf(" -> %s", header.linkname);
617 if (verboseFlag == TRUE || listFlag == TRUE) {
621 /* Remove any clutter lying in our way */
622 if (extractFlag == TRUE) /* .. but only if we are extracting (as */
623 unlink( header.name); /* opposed to listing) (rob@sysgo.de) */
625 /* If we got here, we can be certain we have a legitimate
626 * header to work with. So work with it. */
627 switch ( header.type ) {
630 /* If the name ends in a '/' then assume it is
631 * supposed to be a directory, and fall through */
632 if (header.name[strlen(header.name)-1] != '/') {
633 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
638 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
642 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
646 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
652 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
662 /* Bummer - we read a partial header */
663 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
666 else if (errorFlag==TRUE) {
667 errorMsg( "Error exit delayed from previous errors\n");
672 /* Stuff to do when we are done */
675 if ( *(header.name) == '\0' ) {
677 errorMsg( "Error exit delayed from previous errors\n");
685 #ifdef BB_FEATURE_TAR_CREATE
687 /* Some info to be carried along when creating a new tarball */
690 char* fileName; /* File name of the tarball */
691 int tarFd; /* Open-for-write file descriptor
693 struct stat statBuf; /* Stat info for the tarball, letting
694 us know the inode and device that the
695 tarball lives, so we can avoid trying
696 to include the tarball into itself */
697 int verboseFlag; /* Whether to print extra stuff or not */
698 char** excludeList; /* List of files to not include */
700 typedef struct TarBallInfo TarBallInfo;
703 /* Put an octal string into the specified buffer.
704 * The number is zero and space padded and possibly null padded.
705 * Returns TRUE if successful. */
706 static int putOctal (char *cp, int len, long value)
710 char *tempString = tempBuffer;
712 /* Create a string of the specified length with an initial space,
713 * leading zeroes and the octal number, and a trailing null. */
714 sprintf (tempString, "%0*lo", len - 1, value);
716 /* If the string is too large, suppress the leading space. */
717 tempLength = strlen (tempString) + 1;
718 if (tempLength > len) {
723 /* If the string is still too large, suppress the trailing null. */
724 if (tempLength > len)
727 /* If the string is still too large, fail. */
728 if (tempLength > len)
731 /* Copy the string to the field. */
732 memcpy (cp, tempString, len);
737 /* Write out a tar header for the specified file/directory/whatever */
739 writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
742 struct TarHeader header;
743 #if defined BB_FEATURE_TAR_EXCLUDE
746 const unsigned char *cp = (const unsigned char *) &header;
747 ssize_t size = sizeof(struct TarHeader);
749 memset( &header, 0, size);
751 if (*fileName=='/') {
752 static int alreadyWarned=FALSE;
753 if (alreadyWarned==FALSE) {
754 errorMsg("Removing leading '/' from member names\n");
757 strncpy(header.name, fileName+1, sizeof(header.name));
760 strncpy(header.name, fileName, sizeof(header.name));
763 #if defined BB_FEATURE_TAR_EXCLUDE
764 /* Check for excluded files.... */
765 for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
766 /* Do some extra hoop jumping for when directory names
767 * end in '/' but the entry in tmpList doesn't */
768 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
769 header.name[strlen(header.name)-1]=='/'
770 && strncmp( *tmpList, header.name,
771 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
772 /* Set the mode to something that is not a regular file, thereby
773 * faking out writeTarFile into thinking that nothing further need
774 * be done for this file. Yes, I know this is ugly, but it works. */
775 statbuf->st_mode = 0;
781 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
782 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
783 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
784 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
785 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
786 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
787 TAR_MAGIC_LEN + TAR_VERSION_LEN );
789 /* Enter the user and group names (default to root if it fails) */
790 my_getpwuid(header.uname, statbuf->st_uid);
792 strcpy(header.uname, "root");
793 my_getgrgid(header.gname, statbuf->st_gid);
795 strcpy(header.uname, "root");
797 /* WARNING/NOTICE: I break Hard Links */
798 if (S_ISLNK(statbuf->st_mode)) {
801 header.typeflag = SYMTYPE;
802 link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
803 if ( link_size < 0) {
804 errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
807 buffer[link_size] = '\0';
808 strncpy(header.linkname, buffer, sizeof(header.linkname));
809 } else if (S_ISDIR(statbuf->st_mode)) {
810 header.typeflag = DIRTYPE;
811 strncat(header.name, "/", sizeof(header.name));
812 } else if (S_ISCHR(statbuf->st_mode)) {
813 header.typeflag = CHRTYPE;
814 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
815 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
816 } else if (S_ISBLK(statbuf->st_mode)) {
817 header.typeflag = BLKTYPE;
818 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
819 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
820 } else if (S_ISFIFO(statbuf->st_mode)) {
821 header.typeflag = FIFOTYPE;
822 } else if (S_ISREG(statbuf->st_mode)) {
823 header.typeflag = REGTYPE;
824 putOctal(header.size, sizeof(header.size), statbuf->st_size);
826 errorMsg("%s: Unknown file type\n", fileName);
830 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
831 * the header). The checksum field must be filled with blanks for the
832 * calculation. The checksum field is formatted differently from the
833 * other fields: it has [6] digits, a null, then a space -- rather than
834 * digits, followed by a null like the other fields... */
835 memset(header.chksum, ' ', sizeof(header.chksum));
836 cp = (const unsigned char *) &header;
839 putOctal(header.chksum, 7, chksum);
841 /* Now write the header out to disk */
842 if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
843 errorMsg(io_error, fileName, strerror(errno));
846 /* Pad the header up to the tar block size */
847 for (; size<TAR_BLOCK_SIZE; size++) {
848 write(tbInfo->tarFd, "\0", 1);
850 /* Now do the verbose thing (or not) */
851 if (tbInfo->verboseFlag==TRUE)
852 fprintf(stdout, "%s\n", header.name);
858 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
860 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
862 /* It is against the rules to archive a socket */
863 if (S_ISSOCK(statbuf->st_mode)) {
864 errorMsg("%s: socket ignored\n", fileName);
868 /* It is a bad idea to store the archive we are in the process of creating,
869 * so check the device and inode to be sure that this particular file isn't
871 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
872 tbInfo->statBuf.st_ino == statbuf->st_ino) {
873 errorMsg("%s: file is the archive; skipping\n", fileName);
877 if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
881 /* Now, if the file is a regular file, copy it out to the tarball */
882 if (S_ISREG(statbuf->st_mode)) {
885 ssize_t size=0, readSize=0;
887 /* open the file we want to archive, and make sure all is well */
888 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
889 errorMsg("%s: Cannot open: %s\n", fileName, strerror(errno));
893 /* write the file to the archive */
894 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
895 if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
896 /* Output file seems to have a problem */
897 errorMsg(io_error, fileName, strerror(errno));
903 errorMsg(io_error, fileName, strerror(errno));
906 /* Pad the file up to the tar block size */
907 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
908 write(tbInfo->tarFd, "\0", 1);
916 static int writeTarFile(const char* tarName, int tostdoutFlag,
917 int verboseFlag, int argc, char **argv, char** excludeList)
922 struct TarBallInfo tbInfo;
923 tbInfo.verboseFlag = verboseFlag;
925 /* Make sure there is at least one file to tar up. */
927 fatalError("Cowardly refusing to create an empty archive\n");
929 /* Open the tar file for writing. */
930 if (tostdoutFlag == TRUE)
931 tbInfo.tarFd = fileno(stdout);
933 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
934 if (tbInfo.tarFd < 0) {
935 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
938 tbInfo.excludeList=excludeList;
939 /* Store the stat info for the tarball's file, so
940 * can avoid including the tarball into itself.... */
941 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
942 fatalError(io_error, tarName, strerror(errno));
944 /* Set the umask for this process so it doesn't
945 * screw up permission setting for us later. */
948 /* Read the directory/files and iterate over them one at a time */
950 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
951 writeFileToTarball, writeFileToTarball,
952 (void*) &tbInfo) == FALSE) {
956 /* Write two empty blocks to the end of the archive */
957 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
958 write(tbInfo.tarFd, "\0", 1);
961 /* To be pedantically correct, we would check if the tarball
962 * is smaller then 20 tar blocks, and pad it if it was smaller,
963 * but that isn't necessary for GNU tar interoperability, and
964 * so is considered a waste of space */
966 /* Hang up the tools, close up shop, head home */
968 if (errorFlag == TRUE) {
969 errorMsg("Error exit delayed from previous errors\n");