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>
52 #include <sys/param.h> /* for PATH_MAX */
55 static const char tar_usage[] =
56 #ifdef BB_FEATURE_TAR_CREATE
61 #if defined BB_FEATURE_TAR_EXCLUDE
64 "[-f tarFile] [FILE] ...\n\n"
65 "Create, extract, or list files from a tar file. Note that\n"
66 "this version of tar treats hard links as separate files.\n\n"
67 "Main operation mode:\n"
68 #ifdef BB_FEATURE_TAR_CREATE
74 "\tf\t\tname of tarfile or \"-\" for stdin\n"
75 "\tO\t\textract to stdout\n"
76 #if defined BB_FEATURE_TAR_EXCLUDE
77 "\t--exclude\tfile to exclude\n"
79 "Informative output:\n"
80 "\tv\t\tverbosely list files processed\n"
83 /* Tar file constants */
85 #define MAJOR(dev) (((dev)>>8)&0xff)
86 #define MINOR(dev) ((dev)&0xff)
90 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
94 char name[100]; /* 0-99 */
95 char mode[8]; /* 100-107 */
96 char uid[8]; /* 108-115 */
97 char gid[8]; /* 116-123 */
98 char size[12]; /* 124-135 */
99 char mtime[12]; /* 136-147 */
100 char chksum[8]; /* 148-155 */
101 char typeflag; /* 156-156 */
102 char linkname[100]; /* 157-256 */
103 char magic[6]; /* 257-262 */
104 char version[2]; /* 263-264 */
105 char uname[32]; /* 265-296 */
106 char gname[32]; /* 297-328 */
107 char devmajor[8]; /* 329-336 */
108 char devminor[8]; /* 337-344 */
109 char prefix[155]; /* 345-499 */
110 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
112 typedef struct TarHeader TarHeader;
115 /* A few useful constants */
116 #define TAR_MAGIC "ustar" /* ustar and a null */
117 #define TAR_VERSION " " /* Be compatable with GNU tar format */
118 #define TAR_MAGIC_LEN 6
119 #define TAR_VERSION_LEN 2
120 #define TAR_BLOCK_SIZE 512
122 /* A nice enum with all the possible tar file content types */
125 REGTYPE = '0', /* regular file */
126 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
127 LNKTYPE = '1', /* hard link */
128 SYMTYPE = '2', /* symbolic link */
129 CHRTYPE = '3', /* character special */
130 BLKTYPE = '4', /* block special */
131 DIRTYPE = '5', /* directory */
132 FIFOTYPE = '6', /* FIFO special */
133 CONTTYPE = '7', /* reserved */
135 typedef enum TarFileType TarFileType;
137 /* This struct ignores magic, non-numeric user name,
138 * non-numeric group name, and the checksum, since
139 * these are all ignored by BusyBox tar. */
142 int tarFd; /* An open file descriptor for reading from the tarball */
143 char * name; /* File name */
144 mode_t mode; /* Unix mode, including device bits. */
145 uid_t uid; /* Numeric UID */
146 gid_t gid; /* Numeric GID */
147 size_t size; /* Size of file */
148 time_t mtime; /* Last-modified time */
149 enum TarFileType type; /* Regular, directory, link, etc */
150 char * linkname; /* Name for symbolic and hard links */
151 long devmajor; /* Major number for special device */
152 long devminor; /* Minor number for special device */
154 typedef struct TarInfo TarInfo;
156 /* Local procedures to restore files from a tar file. */
157 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
158 int tostdoutFlag, int verboseFlag, char** excludeList);
162 #ifdef BB_FEATURE_TAR_CREATE
163 /* Local procedures to save files into a tar file. */
164 static int writeTarFile(const char* tarName, int tostdoutFlag,
165 int verboseFlag, int argc, char **argv, char** excludeList);
169 extern int tar_main(int argc, char **argv)
171 char** excludeList=NULL;
172 #if defined BB_FEATURE_TAR_EXCLUDE
173 int excludeListSize=0;
175 const char *tarName=NULL;
176 int listFlag = FALSE;
177 int extractFlag = FALSE;
178 int createFlag = FALSE;
179 int verboseFlag = FALSE;
180 int tostdoutFlag = FALSE;
186 /* Parse any options */
187 while (--argc > 0 && **(++argv) == '-') {
189 while (stopIt==FALSE && *(++(*argv))) {
193 fatalError( "Option requires an argument: No file specified\n");
196 fatalError( "Only one 'f' option allowed\n");
199 fatalError( "Option requires an argument: No file specified\n");
204 if (extractFlag == TRUE || createFlag == TRUE)
210 if (listFlag == TRUE || createFlag == TRUE)
215 if (extractFlag == TRUE || listFlag == TRUE)
229 #if defined BB_FEATURE_TAR_EXCLUDE
230 if (strcmp(*argv, "-exclude")==0) {
232 fatalError( "Option requires an argument: No file specified\n");
234 excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
235 excludeList[excludeListSize] = *(++argv);
236 /* Remove leading "/"s */
237 if (*excludeList[excludeListSize] =='/') {
238 excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
240 if (excludeList[excludeListSize++] == NULL)
241 fatalError( "Option requires an argument: No file specified\n");
242 /* Tack a NULL onto the end of the list */
243 excludeList[excludeListSize] = NULL;
252 fatalError( "Unknown tar flag '%c'\n"
253 "Try `tar --help' for more information\n", **argv);
259 * Do the correct type of action supplying the rest of the
260 * command line arguments as the list of files to process.
262 if (createFlag == TRUE) {
263 #ifndef BB_FEATURE_TAR_CREATE
264 fatalError( "This version of tar was not compiled with tar creation support.\n");
266 exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
269 exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
273 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
277 fixUpPermissions(TarInfo *header)
280 /* Now set permissions etc for the new file */
281 chown(header->name, header->uid, header->gid);
282 chmod(header->name, header->mode);
285 t.modtime = header->mtime;
286 utime(header->name, &t);
290 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
294 size_t actualWriteSz;
296 size_t size = header->size;
297 int outFd=fileno(stdout);
299 /* Open the file to be written, if a file is supposed to be written */
300 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
301 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0)
302 errorMsg(io_error, header->name, strerror(errno));
303 /* Create the path to the file, just in case it isn't there...
304 * This should not screw up path permissions or anything. */
305 createPath(header->name, 0777);
308 /* Write out the file, if we are supposed to be doing that */
311 if ( size > sizeof(buffer) )
312 writeSize = readSize = sizeof(buffer);
314 int mod = size % 512;
316 readSize = size + (512 - mod);
321 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
322 /* Tarball seems to have a problem */
323 errorMsg("tar: Unexpected EOF in archive\n");
326 if ( readSize < writeSize )
327 writeSize = readSize;
329 /* Write out the file, if we are supposed to be doing that */
330 if (extractFlag==TRUE) {
332 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
333 /* Output file seems to have a problem */
334 errorMsg(io_error, header->name, strerror(errno));
338 actualWriteSz=writeSize;
341 size -= actualWriteSz;
344 /* Now we are done writing the file out, so try
345 * and fix up the permissions and whatnot */
346 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
348 fixUpPermissions(header);
354 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
357 if (extractFlag==FALSE || tostdoutFlag==TRUE)
360 if (createPath(header->name, header->mode) != TRUE) {
361 errorMsg("tar: %s: Cannot mkdir: %s\n",
362 header->name, strerror(errno));
365 /* make the final component, just in case it was
366 * omitted by createPath() (which will skip the
367 * directory if it doesn't have a terminating '/') */
368 if (mkdir(header->name, header->mode) == 0) {
369 fixUpPermissions(header);
375 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
377 if (extractFlag==FALSE || tostdoutFlag==TRUE)
380 if (link(header->linkname, header->name) < 0) {
381 errorMsg("tar: %s: Cannot create hard link to '%s': %s\n",
382 header->name, header->linkname, strerror(errno));
386 /* Now set permissions etc for the new directory */
387 fixUpPermissions(header);
392 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
394 if (extractFlag==FALSE || tostdoutFlag==TRUE)
398 if (symlink(header->linkname, header->name) < 0) {
399 errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
400 header->name, header->linkname, strerror(errno));
403 /* Try to change ownership of the symlink.
404 * If libs doesn't support that, don't bother.
405 * Changing the pointed-to-file is the Wrong Thing(tm).
407 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
408 lchown(header->name, header->uid, header->gid);
411 /* Do not change permissions or date on symlink,
412 * since it changes the pointed to file instead. duh. */
414 errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
415 header->name, header->linkname,
416 "symlinks not supported");
422 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
424 if (extractFlag==FALSE || tostdoutFlag==TRUE)
427 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
428 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
429 errorMsg("tar: %s: Cannot mknod: %s\n",
430 header->name, strerror(errno));
433 } else if (S_ISFIFO(header->mode)) {
434 if (mkfifo(header->name, header->mode) < 0) {
435 errorMsg("tar: %s: Cannot mkfifo: %s\n",
436 header->name, strerror(errno));
441 /* Now set permissions etc for the new directory */
442 fixUpPermissions(header);
446 /* Read an octal value in a field of the specified width, with optional
447 * spaces on both sides of the number and with an optional null character
448 * at the end. Returns -1 on an illegal format. */
449 static long getOctal(const char *cp, int size)
453 for(;(size > 0) && (*cp == ' '); cp++, size--);
454 if ((size == 0) || !isOctal(*cp))
456 for(; (size > 0) && isOctal(*cp); size--) {
457 val = val * 8 + *cp++ - '0';
459 for (;(size > 0) && (*cp == ' '); cp++, size--);
460 if ((size > 0) && *cp)
466 /* Parse the tar header and fill in the nice struct with the details */
468 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
472 unsigned char *s = (unsigned char *)rawHeader;
474 header->name = rawHeader->name;
475 /* Check for and relativify any absolute paths */
476 if ( *(header->name) == '/' ) {
477 static int alreadyWarned=FALSE;
479 while (*(header->name) == '/')
482 if (alreadyWarned == FALSE) {
483 errorMsg("tar: Removing leading '/' from member names\n");
484 alreadyWarned = TRUE;
488 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
489 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
490 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
491 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
492 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
493 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
494 header->type = rawHeader->typeflag;
495 header->linkname = rawHeader->linkname;
496 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
497 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
499 /* Check the checksum */
500 for (i = sizeof(*rawHeader); i-- != 0;) {
503 /* Remove the effects of the checksum field (replace
504 * with blanks for the purposes of the checksum) */
505 s = rawHeader->chksum;
506 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
509 sum += ' ' * sizeof(rawHeader->chksum);
517 * Read a tar file and extract or list the specified files within it.
518 * If the list is empty than all files are extracted or listed.
520 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
521 int tostdoutFlag, int verboseFlag, char** excludeList)
523 int status, tarFd=-1;
527 #if defined BB_FEATURE_TAR_EXCLUDE
531 /* Open the tar file for reading. */
532 if (!strcmp(tarName, "-"))
533 tarFd = fileno(stdin);
535 tarFd = open(tarName, O_RDONLY);
537 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
541 /* Set the umask for this process so it doesn't
542 * screw up permission setting for us later. */
545 /* Read the tar file, and iterate over it one file at a time */
546 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
548 /* First, try to read the header */
549 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
550 if ( *(header.name) == '\0' ) {
554 errorMsg("Bad tar header, skipping\n");
558 if ( *(header.name) == '\0' )
560 header.tarFd = tarFd;
562 #if defined BB_FEATURE_TAR_EXCLUDE
565 /* Check for excluded files.... */
566 for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
567 /* Do some extra hoop jumping for when directory names
568 * end in '/' but the entry in tmpList doesn't */
569 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
570 header.name[strlen(header.name)-1]=='/'
571 && strncmp( *tmpList, header.name,
572 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
573 /* If it is a regular file, pretend to extract it with
574 * the extractFlag set to FALSE, so the junk in the tarball
575 * is properly skipped over */
576 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
577 tarExtractRegularFile(&header, FALSE, FALSE);
583 /* There are not the droids you're looking for, move along */
588 /* Special treatment if the list (-t) flag is on */
589 if (verboseFlag == TRUE && extractFlag == FALSE) {
592 struct tm *tm = localtime (&(header.mtime));
594 len=printf("%s ", modeString(header.mode));
595 memset(buf, 0, 8*sizeof(char));
596 my_getpwuid(buf, header.uid);
598 len+=printf("%d", header.uid);
600 len+=printf("%s", buf);
601 memset(buf, 0, 8*sizeof(char));
602 my_getgrgid(buf, header.gid);
604 len+=printf("/%-d ", header.gid);
606 len+=printf("/%-s ", buf);
608 if (header.type==CHRTYPE || header.type==BLKTYPE) {
609 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
610 header.devmajor, header.devminor);
612 len1=snprintf(buf, sizeof(buf), "%d ", header.size);
614 /* Jump through some hoops to make the columns match up */
615 for(;(len+len1)<31;len++)
619 /* Use ISO 8610 time format */
621 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
622 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
623 tm->tm_hour, tm->tm_min, tm->tm_sec);
626 /* List contents if we are supposed to do that */
627 if (verboseFlag == TRUE || listFlag == TRUE) {
628 /* Now the normal listing */
629 printf("%s", header.name);
631 if (verboseFlag == TRUE && listFlag == TRUE) {
632 /* If this is a link, say so */
633 if (header.type==LNKTYPE)
634 printf(" link to %s", header.linkname);
635 else if (header.type==SYMTYPE)
636 printf(" -> %s", header.linkname);
638 if (verboseFlag == TRUE || listFlag == TRUE) {
642 /* Remove any clutter lying in our way */
643 unlink( header.name);
645 /* If we got here, we can be certain we have a legitimate
646 * header to work with. So work with it. */
647 switch ( header.type ) {
650 /* If the name ends in a '/' then assume it is
651 * supposed to be a directory, and fall through */
652 if (header.name[strlen(header.name)-1] != '/') {
653 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
658 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
662 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
666 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
672 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
682 /* Bummer - we read a partial header */
683 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
686 else if (errorFlag==TRUE) {
687 errorMsg( "tar: Error exit delayed from previous errors\n");
692 /* Stuff to do when we are done */
695 if ( *(header.name) == '\0' ) {
697 errorMsg( "tar: Error exit delayed from previous errors\n");
705 #ifdef BB_FEATURE_TAR_CREATE
707 /* Some info to be carried along when creating a new tarball */
710 char* fileName; /* File name of the tarball */
711 int tarFd; /* Open-for-write file descriptor
713 struct stat statBuf; /* Stat info for the tarball, letting
714 us know the inode and device that the
715 tarball lives, so we can avoid trying
716 to include the tarball into itself */
717 int verboseFlag; /* Whether to print extra stuff or not */
718 char** excludeList; /* List of files to not include */
720 typedef struct TarBallInfo TarBallInfo;
723 /* Put an octal string into the specified buffer.
724 * The number is zero and space padded and possibly null padded.
725 * Returns TRUE if successful. */
726 static int putOctal (char *cp, int len, long value)
730 char *tempString = tempBuffer;
732 /* Create a string of the specified length with an initial space,
733 * leading zeroes and the octal number, and a trailing null. */
734 sprintf (tempString, "%0*lo", len - 1, value);
736 /* If the string is too large, suppress the leading space. */
737 tempLength = strlen (tempString) + 1;
738 if (tempLength > len) {
743 /* If the string is still too large, suppress the trailing null. */
744 if (tempLength > len)
747 /* If the string is still too large, fail. */
748 if (tempLength > len)
751 /* Copy the string to the field. */
752 memcpy (cp, tempString, len);
757 /* Write out a tar header for the specified file/directory/whatever */
759 writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
762 struct TarHeader header;
763 #if defined BB_FEATURE_TAR_EXCLUDE
766 const unsigned char *cp = (const unsigned char *) &header;
767 ssize_t size = sizeof(struct TarHeader);
769 memset( &header, 0, size);
771 if (*fileName=='/') {
772 static int alreadyWarned=FALSE;
773 if (alreadyWarned==FALSE) {
774 errorMsg("tar: Removing leading '/' from member names\n");
777 strncpy(header.name, fileName+1, sizeof(header.name));
780 strncpy(header.name, fileName, sizeof(header.name));
783 #if defined BB_FEATURE_TAR_EXCLUDE
784 /* Check for excluded files.... */
785 for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
786 /* Do some extra hoop jumping for when directory names
787 * end in '/' but the entry in tmpList doesn't */
788 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
789 header.name[strlen(header.name)-1]=='/'
790 && strncmp( *tmpList, header.name,
791 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
792 /* Set the mode to something that is not a regular file, thereby
793 * faking out writeTarFile into thinking that nothing further need
794 * be done for this file. Yes, I know this is ugly, but it works. */
795 statbuf->st_mode = 0;
801 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
802 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
803 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
804 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
805 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
806 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
807 TAR_MAGIC_LEN + TAR_VERSION_LEN );
809 /* Enter the user and group names (default to root if it fails) */
810 my_getpwuid(header.uname, statbuf->st_uid);
812 strcpy(header.uname, "root");
813 my_getgrgid(header.gname, statbuf->st_gid);
815 strcpy(header.uname, "root");
817 /* WARNING/NOTICE: I break Hard Links */
818 if (S_ISLNK(statbuf->st_mode)) {
820 header.typeflag = SYMTYPE;
821 if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) {
822 errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
825 strncpy(header.linkname, buffer, sizeof(header.linkname));
826 } else if (S_ISDIR(statbuf->st_mode)) {
827 header.typeflag = DIRTYPE;
828 strncat(header.name, "/", sizeof(header.name));
829 } else if (S_ISCHR(statbuf->st_mode)) {
830 header.typeflag = CHRTYPE;
831 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
832 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
833 } else if (S_ISBLK(statbuf->st_mode)) {
834 header.typeflag = BLKTYPE;
835 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
836 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
837 } else if (S_ISFIFO(statbuf->st_mode)) {
838 header.typeflag = FIFOTYPE;
839 } else if (S_ISREG(statbuf->st_mode)) {
840 header.typeflag = REGTYPE;
841 putOctal(header.size, sizeof(header.size), statbuf->st_size);
843 errorMsg("tar: %s: Unknown file type\n", fileName);
847 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
848 * the header). The checksum field must be filled with blanks for the
849 * calculation. The checksum field is formatted differently from the
850 * other fields: it has [6] digits, a null, then a space -- rather than
851 * digits, followed by a null like the other fields... */
852 memset(header.chksum, ' ', sizeof(header.chksum));
853 cp = (const unsigned char *) &header;
856 putOctal(header.chksum, 7, chksum);
858 /* Now write the header out to disk */
859 if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
860 errorMsg(io_error, fileName, strerror(errno));
863 /* Pad the header up to the tar block size */
864 for (; size<TAR_BLOCK_SIZE; size++) {
865 write(tbInfo->tarFd, "\0", 1);
867 /* Now do the verbose thing (or not) */
868 if (tbInfo->verboseFlag==TRUE)
869 fprintf(stdout, "%s\n", header.name);
875 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
877 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
879 /* It is against the rules to archive a socket */
880 if (S_ISSOCK(statbuf->st_mode)) {
881 errorMsg("tar: %s: socket ignored\n", fileName);
885 /* It is a bad idea to store the archive we are in the process of creating,
886 * so check the device and inode to be sure that this particular file isn't
888 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
889 tbInfo->statBuf.st_ino == statbuf->st_ino) {
890 errorMsg("tar: %s: file is the archive; skipping\n", fileName);
894 if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
898 /* Now, if the file is a regular file, copy it out to the tarball */
899 if (S_ISREG(statbuf->st_mode)) {
902 ssize_t size=0, readSize=0;
904 /* open the file we want to archive, and make sure all is well */
905 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
906 errorMsg("tar: %s: Cannot open: %s\n", fileName, strerror(errno));
910 /* write the file to the archive */
911 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
912 if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
913 /* Output file seems to have a problem */
914 errorMsg(io_error, fileName, strerror(errno));
920 errorMsg(io_error, fileName, strerror(errno));
923 /* Pad the file up to the tar block size */
924 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
925 write(tbInfo->tarFd, "\0", 1);
933 static int writeTarFile(const char* tarName, int tostdoutFlag,
934 int verboseFlag, int argc, char **argv, char** excludeList)
939 struct TarBallInfo tbInfo;
940 tbInfo.verboseFlag = verboseFlag;
942 /* Make sure there is at least one file to tar up. */
944 fatalError("tar: Cowardly refusing to create an empty archive\n");
946 /* Open the tar file for writing. */
947 if (tostdoutFlag == TRUE)
948 tbInfo.tarFd = fileno(stdout);
950 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
951 if (tbInfo.tarFd < 0) {
952 errorMsg( "tar: Error opening '%s': %s\n", tarName, strerror(errno));
955 tbInfo.excludeList=excludeList;
956 /* Store the stat info for the tarball's file, so
957 * can avoid including the tarball into itself.... */
958 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
959 fatalError(io_error, tarName, strerror(errno));
961 /* Set the umask for this process so it doesn't
962 * screw up permission setting for us later. */
965 /* Read the directory/files and iterate over them one at a time */
967 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
968 writeFileToTarball, writeFileToTarball,
969 (void*) &tbInfo) == FALSE) {
973 /* Write two empty blocks to the end of the archive */
974 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
975 write(tbInfo.tarFd, "\0", 1);
978 /* To be pedantically correct, we would check if the tarball
979 * is smaller then 20 tar blocks, and pad it if it was smaller,
980 * but that isn't necessary for GNU tar interoperability, and
981 * so is considered a waste of space */
983 /* Hang up the tools, close up shop, head home */
985 if (errorFlag == TRUE) {
986 errorMsg("tar: Error exit delayed from previous errors\n");