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 /* do normal option parsing */
157 while ((opt = getopt(argc, argv, "cxtvOf:-:")) > 0) {
160 if (extractFlag == TRUE || listFlag == TRUE)
165 if (listFlag == TRUE || createFlag == TRUE)
170 if (extractFlag == TRUE || createFlag == TRUE)
183 fatalError( "Only one 'f' option allowed\n");
185 if (!strcmp(tarName, "-") && createFlag == TRUE)
189 #if defined BB_FEATURE_TAR_EXCLUDE
190 if (strcmp(optarg, "exclude")==0) {
191 if (argv[optind]==NULL)
192 fatalError( "option `--exclude' requires an argument\n");
193 excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
194 excludeList[excludeListSize] = argv[optind];
195 /* Remove leading "/"s */
196 if (*excludeList[excludeListSize] =='/') {
197 excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
199 /* Tack a NULL onto the end of the list */
200 excludeList[excludeListSize] = NULL;
205 fatalError( "Unknown tar flag '%s'\n"
206 "Try `tar --help' for more information\n", optarg);
208 fatalError( "Unknown tar flag '%c'\n"
209 "Try `tar --help' for more information\n", **argv);
214 * Do the correct type of action supplying the rest of the
215 * command line arguments as the list of files to process.
217 if (createFlag == TRUE) {
218 #ifndef BB_FEATURE_TAR_CREATE
219 fatalError( "This version of tar was not compiled with tar creation support.\n");
221 exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc-optind, &argv[optind], excludeList));
224 if (listFlag == TRUE || extractFlag == TRUE) {
225 exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
229 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
233 fixUpPermissions(TarInfo *header)
236 /* Now set permissions etc for the new file */
237 chown(header->name, header->uid, header->gid);
238 chmod(header->name, header->mode);
241 t.modtime = header->mtime;
242 utime(header->name, &t);
246 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
250 size_t actualWriteSz;
252 size_t size = header->size;
253 int outFd=fileno(stdout);
255 /* Open the file to be written, if a file is supposed to be written */
256 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
257 /* Create the path to the file, just in case it isn't there...
258 * This should not screw up path permissions or anything. */
259 createPath(header->name, 0777);
260 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
261 header->mode & ~S_IFMT)) < 0) {
262 errorMsg(io_error, header->name, strerror(errno));
267 /* Write out the file, if we are supposed to be doing that */
270 if ( size > sizeof(buffer) )
271 writeSize = readSize = sizeof(buffer);
273 int mod = size % 512;
275 readSize = size + (512 - mod);
280 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
281 /* Tarball seems to have a problem */
282 errorMsg("Unexpected EOF in archive\n");
285 if ( readSize < writeSize )
286 writeSize = readSize;
288 /* Write out the file, if we are supposed to be doing that */
289 if (extractFlag==TRUE) {
291 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
292 /* Output file seems to have a problem */
293 errorMsg(io_error, header->name, strerror(errno));
297 actualWriteSz=writeSize;
300 size -= actualWriteSz;
303 /* Now we are done writing the file out, so try
304 * and fix up the permissions and whatnot */
305 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
307 fixUpPermissions(header);
313 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
316 if (extractFlag==FALSE || tostdoutFlag==TRUE)
319 if (createPath(header->name, header->mode) != TRUE) {
320 errorMsg("%s: Cannot mkdir: %s\n",
321 header->name, strerror(errno));
324 /* make the final component, just in case it was
325 * omitted by createPath() (which will skip the
326 * directory if it doesn't have a terminating '/') */
327 if (mkdir(header->name, header->mode) == 0) {
328 fixUpPermissions(header);
334 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
336 if (extractFlag==FALSE || tostdoutFlag==TRUE)
339 if (link(header->linkname, header->name) < 0) {
340 errorMsg("%s: Cannot create hard link to '%s': %s\n",
341 header->name, header->linkname, strerror(errno));
345 /* Now set permissions etc for the new directory */
346 fixUpPermissions(header);
351 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
353 if (extractFlag==FALSE || tostdoutFlag==TRUE)
357 if (symlink(header->linkname, header->name) < 0) {
358 errorMsg("%s: Cannot create symlink to '%s': %s\n",
359 header->name, header->linkname, strerror(errno));
362 /* Try to change ownership of the symlink.
363 * If libs doesn't support that, don't bother.
364 * Changing the pointed-to-file is the Wrong Thing(tm).
366 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
367 lchown(header->name, header->uid, header->gid);
370 /* Do not change permissions or date on symlink,
371 * since it changes the pointed to file instead. duh. */
373 errorMsg("%s: Cannot create symlink to '%s': %s\n",
374 header->name, header->linkname,
375 "symlinks not supported");
381 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
383 if (extractFlag==FALSE || tostdoutFlag==TRUE)
386 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
387 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
388 errorMsg("%s: Cannot mknod: %s\n",
389 header->name, strerror(errno));
392 } else if (S_ISFIFO(header->mode)) {
393 if (mkfifo(header->name, header->mode) < 0) {
394 errorMsg("%s: Cannot mkfifo: %s\n",
395 header->name, strerror(errno));
400 /* Now set permissions etc for the new directory */
401 fixUpPermissions(header);
405 /* Read an octal value in a field of the specified width, with optional
406 * spaces on both sides of the number and with an optional null character
407 * at the end. Returns -1 on an illegal format. */
408 static long getOctal(const char *cp, int size)
412 for(;(size > 0) && (*cp == ' '); cp++, size--);
413 if ((size == 0) || !isOctal(*cp))
415 for(; (size > 0) && isOctal(*cp); size--) {
416 val = val * 8 + *cp++ - '0';
418 for (;(size > 0) && (*cp == ' '); cp++, size--);
419 if ((size > 0) && *cp)
425 /* Parse the tar header and fill in the nice struct with the details */
427 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
431 unsigned char *s = (unsigned char *)rawHeader;
433 header->name = rawHeader->name;
434 /* Check for and relativify any absolute paths */
435 if ( *(header->name) == '/' ) {
436 static int alreadyWarned=FALSE;
438 while (*(header->name) == '/')
441 if (alreadyWarned == FALSE) {
442 errorMsg("Removing leading '/' from member names\n");
443 alreadyWarned = TRUE;
447 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
448 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
449 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
450 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
451 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
452 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
453 header->type = rawHeader->typeflag;
454 header->linkname = rawHeader->linkname;
455 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
456 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
458 /* Check the checksum */
459 for (i = sizeof(*rawHeader); i-- != 0;) {
462 /* Remove the effects of the checksum field (replace
463 * with blanks for the purposes of the checksum) */
464 s = rawHeader->chksum;
465 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
468 sum += ' ' * sizeof(rawHeader->chksum);
476 * Read a tar file and extract or list the specified files within it.
477 * If the list is empty than all files are extracted or listed.
479 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
480 int tostdoutFlag, int verboseFlag, char** excludeList)
482 int status, tarFd=-1;
486 #if defined BB_FEATURE_TAR_EXCLUDE
490 /* Open the tar file for reading. */
491 if (!strcmp(tarName, "-"))
492 tarFd = fileno(stdin);
494 tarFd = open(tarName, O_RDONLY);
496 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
500 /* Set the umask for this process so it doesn't
501 * screw up permission setting for us later. */
504 /* Read the tar file, and iterate over it one file at a time */
505 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
507 /* First, try to read the header */
508 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
509 if ( *(header.name) == '\0' ) {
513 errorMsg("Bad tar header, skipping\n");
517 if ( *(header.name) == '\0' )
519 header.tarFd = tarFd;
521 #if defined BB_FEATURE_TAR_EXCLUDE
524 /* Check for excluded files.... */
525 for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
526 /* Do some extra hoop jumping for when directory names
527 * end in '/' but the entry in tmpList doesn't */
528 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
529 header.name[strlen(header.name)-1]=='/'
530 && strncmp( *tmpList, header.name,
531 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
532 /* If it is a regular file, pretend to extract it with
533 * the extractFlag set to FALSE, so the junk in the tarball
534 * is properly skipped over */
535 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
536 tarExtractRegularFile(&header, FALSE, FALSE);
542 /* There are not the droids you're looking for, move along */
547 /* Special treatment if the list (-t) flag is on */
548 if (verboseFlag == TRUE && extractFlag == FALSE) {
551 struct tm *tm = localtime (&(header.mtime));
553 len=printf("%s ", modeString(header.mode));
554 memset(buf, 0, 8*sizeof(char));
555 my_getpwuid(buf, header.uid);
557 len+=printf("%d", header.uid);
559 len+=printf("%s", buf);
560 memset(buf, 0, 8*sizeof(char));
561 my_getgrgid(buf, header.gid);
563 len+=printf("/%-d ", header.gid);
565 len+=printf("/%-s ", buf);
567 if (header.type==CHRTYPE || header.type==BLKTYPE) {
568 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
569 header.devmajor, header.devminor);
571 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
573 /* Jump through some hoops to make the columns match up */
574 for(;(len+len1)<31;len++)
578 /* Use ISO 8610 time format */
580 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
581 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
582 tm->tm_hour, tm->tm_min, tm->tm_sec);
585 /* List contents if we are supposed to do that */
586 if (verboseFlag == TRUE && listFlag != TRUE) {
587 /* Now the normal listing */
589 if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
591 fprintf(vbFd, "%s\n", header.name);
594 if (verboseFlag == TRUE && listFlag == TRUE) {
595 printf("%s", header.name);
596 if (header.type==LNKTYPE) /* If this is a link, say so */
597 printf(" link to %s", header.linkname);
598 else if (header.type==SYMTYPE)
599 printf(" -> %s", header.linkname);
603 /* Remove files if we would overwrite them */
604 if (extractFlag == TRUE && tostdOut == FALSE)
607 /* If we got here, we can be certain we have a legitimate
608 * header to work with. So work with it. */
609 switch ( header.type ) {
612 /* If the name ends in a '/' then assume it is
613 * supposed to be a directory, and fall through */
614 if (header.name[strlen(header.name)-1] != '/') {
615 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
620 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
624 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
628 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
634 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
644 /* Bummer - we read a partial header */
645 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
648 else if (errorFlag==TRUE) {
649 errorMsg( "Error exit delayed from previous errors\n");
654 /* Stuff to do when we are done */
657 if ( *(header.name) == '\0' ) {
659 errorMsg( "Error exit delayed from previous errors\n");
667 #ifdef BB_FEATURE_TAR_CREATE
669 /* Some info to be carried along when creating a new tarball */
672 char* fileName; /* File name of the tarball */
673 int tarFd; /* Open-for-write file descriptor
675 struct stat statBuf; /* Stat info for the tarball, letting
676 us know the inode and device that the
677 tarball lives, so we can avoid trying
678 to include the tarball into itself */
679 int verboseFlag; /* Whether to print extra stuff or not */
680 char** excludeList; /* List of files to not include */
682 typedef struct TarBallInfo TarBallInfo;
685 /* Put an octal string into the specified buffer.
686 * The number is zero and space padded and possibly null padded.
687 * Returns TRUE if successful. */
688 static int putOctal (char *cp, int len, long value)
692 char *tempString = tempBuffer;
694 /* Create a string of the specified length with an initial space,
695 * leading zeroes and the octal number, and a trailing null. */
696 sprintf (tempString, "%0*lo", len - 1, value);
698 /* If the string is too large, suppress the leading space. */
699 tempLength = strlen (tempString) + 1;
700 if (tempLength > len) {
705 /* If the string is still too large, suppress the trailing null. */
706 if (tempLength > len)
709 /* If the string is still too large, fail. */
710 if (tempLength > len)
713 /* Copy the string to the field. */
714 memcpy (cp, tempString, len);
719 /* Write out a tar header for the specified file/directory/whatever */
721 writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
724 struct TarHeader header;
725 #if defined BB_FEATURE_TAR_EXCLUDE
728 const unsigned char *cp = (const unsigned char *) &header;
729 ssize_t size = sizeof(struct TarHeader);
731 memset( &header, 0, size);
733 if (*fileName=='/') {
734 static int alreadyWarned=FALSE;
735 if (alreadyWarned==FALSE) {
736 errorMsg("Removing leading '/' from member names\n");
739 strncpy(header.name, fileName+1, sizeof(header.name));
742 strncpy(header.name, fileName, sizeof(header.name));
745 #if defined BB_FEATURE_TAR_EXCLUDE
746 /* Check for excluded files.... */
747 for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
748 /* Do some extra hoop jumping for when directory names
749 * end in '/' but the entry in tmpList doesn't */
750 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
751 header.name[strlen(header.name)-1]=='/'
752 && strncmp( *tmpList, header.name,
753 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
754 /* Set the mode to something that is not a regular file, thereby
755 * faking out writeTarFile into thinking that nothing further need
756 * be done for this file. Yes, I know this is ugly, but it works. */
757 statbuf->st_mode = 0;
763 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
764 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
765 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
766 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
767 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
768 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
769 TAR_MAGIC_LEN + TAR_VERSION_LEN );
771 /* Enter the user and group names (default to root if it fails) */
772 my_getpwuid(header.uname, statbuf->st_uid);
774 strcpy(header.uname, "root");
775 my_getgrgid(header.gname, statbuf->st_gid);
777 strcpy(header.uname, "root");
779 /* WARNING/NOTICE: I break Hard Links */
780 if (S_ISLNK(statbuf->st_mode)) {
783 header.typeflag = SYMTYPE;
784 link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
785 if ( link_size < 0) {
786 errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
789 buffer[link_size] = '\0';
790 strncpy(header.linkname, buffer, sizeof(header.linkname));
791 } else if (S_ISDIR(statbuf->st_mode)) {
792 header.typeflag = DIRTYPE;
793 strncat(header.name, "/", sizeof(header.name));
794 } else if (S_ISCHR(statbuf->st_mode)) {
795 header.typeflag = CHRTYPE;
796 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
797 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
798 } else if (S_ISBLK(statbuf->st_mode)) {
799 header.typeflag = BLKTYPE;
800 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
801 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
802 } else if (S_ISFIFO(statbuf->st_mode)) {
803 header.typeflag = FIFOTYPE;
804 } else if (S_ISREG(statbuf->st_mode)) {
805 header.typeflag = REGTYPE;
806 putOctal(header.size, sizeof(header.size), statbuf->st_size);
808 errorMsg("%s: Unknown file type\n", fileName);
812 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
813 * the header). The checksum field must be filled with blanks for the
814 * calculation. The checksum field is formatted differently from the
815 * other fields: it has [6] digits, a null, then a space -- rather than
816 * digits, followed by a null like the other fields... */
817 memset(header.chksum, ' ', sizeof(header.chksum));
818 cp = (const unsigned char *) &header;
821 putOctal(header.chksum, 7, chksum);
823 /* Now write the header out to disk */
824 if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
825 errorMsg(io_error, fileName, strerror(errno));
828 /* Pad the header up to the tar block size */
829 for (; size<TAR_BLOCK_SIZE; size++) {
830 write(tbInfo->tarFd, "\0", 1);
832 /* Now do the verbose thing (or not) */
833 if (tbInfo->verboseFlag==TRUE) {
835 if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
837 fprintf(vbFd, "%s\n", header.name);
844 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
846 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
848 /* It is against the rules to archive a socket */
849 if (S_ISSOCK(statbuf->st_mode)) {
850 errorMsg("%s: socket ignored\n", fileName);
854 /* It is a bad idea to store the archive we are in the process of creating,
855 * so check the device and inode to be sure that this particular file isn't
857 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
858 tbInfo->statBuf.st_ino == statbuf->st_ino) {
859 errorMsg("%s: file is the archive; skipping\n", fileName);
863 if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
867 /* Now, if the file is a regular file, copy it out to the tarball */
868 if (S_ISREG(statbuf->st_mode)) {
871 ssize_t size=0, readSize=0;
873 /* open the file we want to archive, and make sure all is well */
874 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
875 errorMsg("%s: Cannot open: %s\n", fileName, strerror(errno));
879 /* write the file to the archive */
880 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
881 if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
882 /* Output file seems to have a problem */
883 errorMsg(io_error, fileName, strerror(errno));
889 errorMsg(io_error, fileName, strerror(errno));
892 /* Pad the file up to the tar block size */
893 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
894 write(tbInfo->tarFd, "\0", 1);
902 static int writeTarFile(const char* tarName, int tostdoutFlag,
903 int verboseFlag, int argc, char **argv, char** excludeList)
908 struct TarBallInfo tbInfo;
909 tbInfo.verboseFlag = verboseFlag;
911 /* Make sure there is at least one file to tar up. */
913 fatalError("Cowardly refusing to create an empty archive\n");
915 /* Open the tar file for writing. */
916 if (tostdoutFlag == TRUE)
917 tbInfo.tarFd = fileno(stdout);
919 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
920 if (tbInfo.tarFd < 0) {
921 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
924 tbInfo.excludeList=excludeList;
925 /* Store the stat info for the tarball's file, so
926 * can avoid including the tarball into itself.... */
927 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
928 fatalError(io_error, tarName, strerror(errno));
930 /* Set the umask for this process so it doesn't
931 * screw up permission setting for us later. */
934 /* Read the directory/files and iterate over them one at a time */
936 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
937 writeFileToTarball, writeFileToTarball,
938 (void*) &tbInfo) == FALSE) {
942 /* Write two empty blocks to the end of the archive */
943 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
944 write(tbInfo.tarFd, "\0", 1);
947 /* To be pedantically correct, we would check if the tarball
948 * is smaller then 20 tar blocks, and pad it if it was smaller,
949 * but that isn't necessary for GNU tar interoperability, and
950 * so is considered a waste of space */
952 /* Hang up the tools, close up shop, head home */
954 if (errorFlag == TRUE) {
955 errorMsg("Error exit delayed from previous errors\n");