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
42 #define bb_need_name_longer_then_foo
51 #include <sys/types.h>
52 #include <sys/sysmacros.h>
55 /* Tar file constants */
57 #define MAJOR(dev) (((dev)>>8)&0xff)
58 #define MINOR(dev) ((dev)&0xff)
63 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
67 char name[NAME_SIZE]; /* 0-99 */
68 char mode[8]; /* 100-107 */
69 char uid[8]; /* 108-115 */
70 char gid[8]; /* 116-123 */
71 char size[12]; /* 124-135 */
72 char mtime[12]; /* 136-147 */
73 char chksum[8]; /* 148-155 */
74 char typeflag; /* 156-156 */
75 char linkname[NAME_SIZE]; /* 157-256 */
76 char magic[6]; /* 257-262 */
77 char version[2]; /* 263-264 */
78 char uname[32]; /* 265-296 */
79 char gname[32]; /* 297-328 */
80 char devmajor[8]; /* 329-336 */
81 char devminor[8]; /* 337-344 */
82 char prefix[155]; /* 345-499 */
83 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
85 typedef struct TarHeader TarHeader;
88 /* A few useful constants */
89 #define TAR_MAGIC "ustar" /* ustar and a null */
90 #define TAR_VERSION " " /* Be compatable with GNU tar format */
91 #define TAR_MAGIC_LEN 6
92 #define TAR_VERSION_LEN 2
93 #define TAR_BLOCK_SIZE 512
95 /* A nice enum with all the possible tar file content types */
98 REGTYPE = '0', /* regular file */
99 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
100 LNKTYPE = '1', /* hard link */
101 SYMTYPE = '2', /* symbolic link */
102 CHRTYPE = '3', /* character special */
103 BLKTYPE = '4', /* block special */
104 DIRTYPE = '5', /* directory */
105 FIFOTYPE = '6', /* FIFO special */
106 CONTTYPE = '7', /* reserved */
107 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
108 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
110 typedef enum TarFileType TarFileType;
112 /* This struct ignores magic, non-numeric user name,
113 * non-numeric group name, and the checksum, since
114 * these are all ignored by BusyBox tar. */
117 int tarFd; /* An open file descriptor for reading from the tarball */
118 char * name; /* File name */
119 mode_t mode; /* Unix mode, including device bits. */
120 uid_t uid; /* Numeric UID */
121 gid_t gid; /* Numeric GID */
122 size_t size; /* Size of file */
123 time_t mtime; /* Last-modified time */
124 enum TarFileType type; /* Regular, directory, link, etc */
125 char * linkname; /* Name for symbolic and hard links */
126 long devmajor; /* Major number for special device */
127 long devminor; /* Minor number for special device */
129 typedef struct TarInfo TarInfo;
131 /* Local procedures to restore files from a tar file. */
132 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
133 int tostdoutFlag, int verboseFlag, char** extractList,
138 #ifdef BB_FEATURE_TAR_CREATE
139 /* Local procedures to save files into a tar file. */
140 static int writeTarFile(const char* tarName, int tostdoutFlag,
141 int verboseFlag, int argc, char **argv, char** excludeList);
144 extern int tar_main(int argc, char **argv)
146 char** excludeList=NULL;
147 #if defined BB_FEATURE_TAR_EXCLUDE
148 int excludeListSize=0;
150 const char *tarName="-";
151 int listFlag = FALSE;
152 int extractFlag = FALSE;
153 int createFlag = FALSE;
154 int verboseFlag = FALSE;
155 int tostdoutFlag = FALSE;
163 /* do normal option parsing */
164 while (--argc > 0 && ((*argv && **(++argv) == '-') ||
165 (firstOpt==TRUE && strspn(*argv, "-cxt") ))) {
168 while (stopIt==FALSE && *argv && **argv) {
171 if (extractFlag == TRUE || listFlag == TRUE)
176 if (listFlag == TRUE || createFlag == TRUE)
181 if (extractFlag == TRUE || createFlag == TRUE)
194 fatalError( "Option requires an argument: No file specified\n");
197 fatalError( "Only one 'f' option allowed\n");
200 fatalError( "Option requires an argument: No file specified\n");
201 if (!strcmp(tarName, "-") && createFlag == TRUE)
205 #if defined BB_FEATURE_TAR_EXCLUDE
207 if (strcmp(*argv, "-exclude")==0) {
209 fatalError( "Option requires an argument: No file specified\n");
211 excludeList=xrealloc( excludeList, sizeof(char**) * (excludeListSize+2));
212 excludeList[excludeListSize] = *(++argv);
213 /* Remove leading "/"s */
214 if (*excludeList[excludeListSize] =='/')
215 excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
216 /* Tack a NULL onto the end of the list */
217 excludeList[++excludeListSize] = NULL;
232 * Do the correct type of action supplying the rest of the
233 * command line arguments as the list of files to process.
235 if (createFlag == TRUE) {
236 #ifndef BB_FEATURE_TAR_CREATE
237 fatalError( "This version of tar was not compiled with tar creation support.\n");
239 exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
242 if (listFlag == TRUE || extractFlag == TRUE) {
243 exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, &argv[optind], excludeList));
247 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
251 fixUpPermissions(TarInfo *header)
254 /* Now set permissions etc for the new file */
255 chown(header->name, header->uid, header->gid);
256 chmod(header->name, header->mode);
259 t.modtime = header->mtime;
260 utime(header->name, &t);
264 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
268 size_t actualWriteSz;
270 size_t size = header->size;
271 int outFd=fileno(stdout);
273 /* Open the file to be written, if a file is supposed to be written */
274 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
275 /* Create the path to the file, just in case it isn't there...
276 * This should not screw up path permissions or anything. */
277 createPath(header->name, 0777);
278 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
279 header->mode & ~S_IFMT)) < 0) {
280 errorMsg(io_error, header->name, strerror(errno));
285 /* Write out the file, if we are supposed to be doing that */
288 if ( size > sizeof(buffer) )
289 writeSize = readSize = sizeof(buffer);
291 int mod = size % 512;
293 readSize = size + (512 - mod);
298 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
299 /* Tarball seems to have a problem */
300 errorMsg("Unexpected EOF in archive\n");
303 if ( readSize < writeSize )
304 writeSize = readSize;
306 /* Write out the file, if we are supposed to be doing that */
307 if (extractFlag==TRUE) {
309 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
310 /* Output file seems to have a problem */
311 errorMsg(io_error, header->name, strerror(errno));
315 actualWriteSz=writeSize;
318 size -= actualWriteSz;
321 /* Now we are done writing the file out, so try
322 * and fix up the permissions and whatnot */
323 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
325 fixUpPermissions(header);
331 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
334 if (extractFlag==FALSE || tostdoutFlag==TRUE)
337 if (createPath(header->name, header->mode) != TRUE) {
338 errorMsg("%s: Cannot mkdir: %s\n",
339 header->name, strerror(errno));
342 /* make the final component, just in case it was
343 * omitted by createPath() (which will skip the
344 * directory if it doesn't have a terminating '/') */
345 if (mkdir(header->name, header->mode) == 0) {
346 fixUpPermissions(header);
352 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
354 if (extractFlag==FALSE || tostdoutFlag==TRUE)
357 if (link(header->linkname, header->name) < 0) {
358 errorMsg("%s: Cannot create hard link to '%s': %s\n",
359 header->name, header->linkname, strerror(errno));
363 /* Now set permissions etc for the new directory */
364 fixUpPermissions(header);
369 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
371 if (extractFlag==FALSE || tostdoutFlag==TRUE)
375 if (symlink(header->linkname, header->name) < 0) {
376 errorMsg("%s: Cannot create symlink to '%s': %s\n",
377 header->name, header->linkname, strerror(errno));
380 /* Try to change ownership of the symlink.
381 * If libs doesn't support that, don't bother.
382 * Changing the pointed-to-file is the Wrong Thing(tm).
384 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
385 lchown(header->name, header->uid, header->gid);
388 /* Do not change permissions or date on symlink,
389 * since it changes the pointed to file instead. duh. */
391 errorMsg("%s: Cannot create symlink to '%s': %s\n",
392 header->name, header->linkname,
393 "symlinks not supported");
399 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
401 if (extractFlag==FALSE || tostdoutFlag==TRUE)
404 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
405 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
406 errorMsg("%s: Cannot mknod: %s\n",
407 header->name, strerror(errno));
410 } else if (S_ISFIFO(header->mode)) {
411 if (mkfifo(header->name, header->mode) < 0) {
412 errorMsg("%s: Cannot mkfifo: %s\n",
413 header->name, strerror(errno));
418 /* Now set permissions etc for the new directory */
419 fixUpPermissions(header);
423 /* Read an octal value in a field of the specified width, with optional
424 * spaces on both sides of the number and with an optional null character
425 * at the end. Returns -1 on an illegal format. */
426 static long getOctal(const char *cp, int size)
430 for(;(size > 0) && (*cp == ' '); cp++, size--);
431 if ((size == 0) || !isOctal(*cp))
433 for(; (size > 0) && isOctal(*cp); size--) {
434 val = val * 8 + *cp++ - '0';
436 for (;(size > 0) && (*cp == ' '); cp++, size--);
437 if ((size > 0) && *cp)
443 /* Parse the tar header and fill in the nice struct with the details */
445 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
449 unsigned char *s = (unsigned char *)rawHeader;
451 header->name = rawHeader->name;
452 /* Check for and relativify any absolute paths */
453 if ( *(header->name) == '/' ) {
454 static int alreadyWarned=FALSE;
456 while (*(header->name) == '/')
459 if (alreadyWarned == FALSE) {
460 errorMsg("Removing leading '/' from member names\n");
461 alreadyWarned = TRUE;
465 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
466 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
467 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
468 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
469 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
470 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
471 header->type = rawHeader->typeflag;
472 header->linkname = rawHeader->linkname;
473 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
474 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
476 /* Check the checksum */
477 for (i = sizeof(*rawHeader); i-- != 0;) {
480 /* Remove the effects of the checksum field (replace
481 * with blanks for the purposes of the checksum) */
482 s = rawHeader->chksum;
483 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
486 sum += ' ' * sizeof(rawHeader->chksum);
494 * Read a tar file and extract or list the specified files within it.
495 * If the list is empty than all files are extracted or listed.
497 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
498 int tostdoutFlag, int verboseFlag, char** extractList,
501 int status, tarFd=-1;
503 int skipNextHeaderFlag=FALSE;
508 /* Open the tar file for reading. */
509 if (!strcmp(tarName, "-"))
510 tarFd = fileno(stdin);
512 tarFd = open(tarName, O_RDONLY);
514 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
518 /* Set the umask for this process so it doesn't
519 * screw up permission setting for us later. */
522 /* Read the tar file, and iterate over it one file at a time */
523 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
525 /* Try to read the header */
526 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
527 if ( *(header.name) == '\0' ) {
531 errorMsg("Bad tar header, skipping\n");
535 if ( *(header.name) == '\0' )
537 header.tarFd = tarFd;
539 /* Skip funky extra GNU headers that precede long files */
540 if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
541 skipNextHeaderFlag=TRUE;
542 tarExtractRegularFile(&header, FALSE, FALSE);
545 if ( skipNextHeaderFlag == TRUE ) {
546 skipNextHeaderFlag=FALSE;
547 errorMsg(name_longer_then_foo, NAME_SIZE);
548 tarExtractRegularFile(&header, FALSE, FALSE);
552 #if defined BB_FEATURE_TAR_EXCLUDE
555 /* Check for excluded files.... */
556 for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
557 /* Do some extra hoop jumping for when directory names
558 * end in '/' but the entry in tmpList doesn't */
559 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
560 header.name[strlen(header.name)-1]=='/'
561 && strncmp( *tmpList, header.name,
562 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
563 /* If it is a regular file, pretend to extract it with
564 * the extractFlag set to FALSE, so the junk in the tarball
565 * is properly skipped over */
566 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
567 tarExtractRegularFile(&header, FALSE, FALSE);
573 /* There are not the droids you're looking for, move along */
578 if (*extractList != NULL) {
580 for (tmpList = extractList; *tmpList != NULL; tmpList++) {
581 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
582 header.name[strlen(header.name)-1]=='/'
583 && strncmp( *tmpList, header.name,
584 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
585 /* If it is a regular file, pretend to extract it with
586 * the extractFlag set to FALSE, so the junk in the tarball
587 * is properly skipped over */
592 /* There are not the droids you're looking for, move along */
593 if (skipFlag == TRUE) {
594 if ( header.type==REGTYPE || header.type==REGTYPE0 )
595 tarExtractRegularFile(&header, FALSE, FALSE);
600 if (listFlag == TRUE) {
601 /* Special treatment if the list (-t) flag is on */
602 if (verboseFlag == TRUE) {
605 struct tm *tm = localtime (&(header.mtime));
607 len=printf("%s ", modeString(header.mode));
608 memset(buf, 0, 8*sizeof(char));
609 my_getpwuid(buf, header.uid);
611 len+=printf("%d", header.uid);
613 len+=printf("%s", buf);
614 memset(buf, 0, 8*sizeof(char));
615 my_getgrgid(buf, header.gid);
617 len+=printf("/%-d ", header.gid);
619 len+=printf("/%-s ", buf);
621 if (header.type==CHRTYPE || header.type==BLKTYPE) {
622 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
623 header.devmajor, header.devminor);
625 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
627 /* Jump through some hoops to make the columns match up */
628 for(;(len+len1)<31;len++)
632 /* Use ISO 8610 time format */
634 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
635 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
636 tm->tm_hour, tm->tm_min, tm->tm_sec);
639 printf("%s", header.name);
640 if (verboseFlag == TRUE) {
641 if (header.type==LNKTYPE) /* If this is a link, say so */
642 printf(" link to %s", header.linkname);
643 else if (header.type==SYMTYPE)
644 printf(" -> %s", header.linkname);
649 /* List contents if we are supposed to do that */
650 if (verboseFlag == TRUE && extractFlag == TRUE) {
651 /* Now the normal listing */
653 if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
655 fprintf(vbFd, "%s\n", header.name);
658 /* Remove files if we would overwrite them */
659 if (extractFlag == TRUE && tostdoutFlag == FALSE)
662 /* If we got here, we can be certain we have a legitimate
663 * header to work with. So work with it. */
664 switch ( header.type ) {
667 /* If the name ends in a '/' then assume it is
668 * supposed to be a directory, and fall through */
669 if (header.name[strlen(header.name)-1] != '/') {
670 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
675 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
679 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
683 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
689 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
693 /* Handled earlier */
696 skipNextHeaderFlag=TRUE;
700 errorMsg("Unknown file type '%c' in tar file\n", header.type);
707 /* Bummer - we read a partial header */
708 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
711 else if (errorFlag==TRUE) {
712 errorMsg( "Error exit delayed from previous errors\n");
717 /* Stuff to do when we are done */
720 if ( *(header.name) == '\0' ) {
722 errorMsg( "Error exit delayed from previous errors\n");
730 #ifdef BB_FEATURE_TAR_CREATE
732 /* Some info to be carried along when creating a new tarball */
735 char* fileName; /* File name of the tarball */
736 int tarFd; /* Open-for-write file descriptor
738 struct stat statBuf; /* Stat info for the tarball, letting
739 us know the inode and device that the
740 tarball lives, so we can avoid trying
741 to include the tarball into itself */
742 int verboseFlag; /* Whether to print extra stuff or not */
743 char** excludeList; /* List of files to not include */
745 typedef struct TarBallInfo TarBallInfo;
748 /* Put an octal string into the specified buffer.
749 * The number is zero and space padded and possibly null padded.
750 * Returns TRUE if successful. */
751 static int putOctal (char *cp, int len, long value)
755 char *tempString = tempBuffer;
757 /* Create a string of the specified length with an initial space,
758 * leading zeroes and the octal number, and a trailing null. */
759 sprintf (tempString, "%0*lo", len - 1, value);
761 /* If the string is too large, suppress the leading space. */
762 tempLength = strlen (tempString) + 1;
763 if (tempLength > len) {
768 /* If the string is still too large, suppress the trailing null. */
769 if (tempLength > len)
772 /* If the string is still too large, fail. */
773 if (tempLength > len)
776 /* Copy the string to the field. */
777 memcpy (cp, tempString, len);
782 /* Write out a tar header for the specified file/directory/whatever */
784 writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
787 struct TarHeader header;
788 #if defined BB_FEATURE_TAR_EXCLUDE
791 const unsigned char *cp = (const unsigned char *) &header;
792 ssize_t size = sizeof(struct TarHeader);
794 memset( &header, 0, size);
796 if (*fileName=='/') {
797 static int alreadyWarned=FALSE;
798 if (alreadyWarned==FALSE) {
799 errorMsg("Removing leading '/' from member names\n");
802 strncpy(header.name, fileName+1, sizeof(header.name));
805 strncpy(header.name, fileName, sizeof(header.name));
808 #if defined BB_FEATURE_TAR_EXCLUDE
809 /* Check for excluded files.... */
810 for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
811 /* Do some extra hoop jumping for when directory names
812 * end in '/' but the entry in tmpList doesn't */
813 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
814 header.name[strlen(header.name)-1]=='/'
815 && strncmp( *tmpList, header.name,
816 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
817 /* Set the mode to something that is not a regular file, thereby
818 * faking out writeTarFile into thinking that nothing further need
819 * be done for this file. Yes, I know this is ugly, but it works. */
820 statbuf->st_mode = 0;
826 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
827 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
828 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
829 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
830 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
831 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
832 TAR_MAGIC_LEN + TAR_VERSION_LEN );
834 /* Enter the user and group names (default to root if it fails) */
835 my_getpwuid(header.uname, statbuf->st_uid);
837 strcpy(header.uname, "root");
838 my_getgrgid(header.gname, statbuf->st_gid);
840 strcpy(header.uname, "root");
842 /* WARNING/NOTICE: I break Hard Links */
843 if (S_ISLNK(statbuf->st_mode)) {
846 header.typeflag = SYMTYPE;
847 link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
848 if ( link_size < 0) {
849 errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
852 buffer[link_size] = '\0';
853 strncpy(header.linkname, buffer, sizeof(header.linkname));
854 } else if (S_ISDIR(statbuf->st_mode)) {
855 header.typeflag = DIRTYPE;
856 strncat(header.name, "/", sizeof(header.name));
857 } else if (S_ISCHR(statbuf->st_mode)) {
858 header.typeflag = CHRTYPE;
859 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
860 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
861 } else if (S_ISBLK(statbuf->st_mode)) {
862 header.typeflag = BLKTYPE;
863 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
864 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
865 } else if (S_ISFIFO(statbuf->st_mode)) {
866 header.typeflag = FIFOTYPE;
867 } else if (S_ISREG(statbuf->st_mode)) {
868 header.typeflag = REGTYPE;
869 putOctal(header.size, sizeof(header.size), statbuf->st_size);
871 errorMsg("%s: Unknown file type\n", fileName);
875 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
876 * the header). The checksum field must be filled with blanks for the
877 * calculation. The checksum field is formatted differently from the
878 * other fields: it has [6] digits, a null, then a space -- rather than
879 * digits, followed by a null like the other fields... */
880 memset(header.chksum, ' ', sizeof(header.chksum));
881 cp = (const unsigned char *) &header;
884 putOctal(header.chksum, 7, chksum);
886 /* Now write the header out to disk */
887 if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
888 errorMsg(io_error, fileName, strerror(errno));
891 /* Pad the header up to the tar block size */
892 for (; size<TAR_BLOCK_SIZE; size++) {
893 write(tbInfo->tarFd, "\0", 1);
895 /* Now do the verbose thing (or not) */
896 if (tbInfo->verboseFlag==TRUE) {
898 if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
900 fprintf(vbFd, "%s\n", header.name);
907 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
909 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
911 /* It is against the rules to archive a socket */
912 if (S_ISSOCK(statbuf->st_mode)) {
913 errorMsg("%s: socket ignored\n", fileName);
917 /* It is a bad idea to store the archive we are in the process of creating,
918 * so check the device and inode to be sure that this particular file isn't
920 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
921 tbInfo->statBuf.st_ino == statbuf->st_ino) {
922 errorMsg("%s: file is the archive; skipping\n", fileName);
926 if (strlen(fileName) >= NAME_SIZE) {
927 errorMsg(name_longer_then_foo, NAME_SIZE);
931 if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
935 /* Now, if the file is a regular file, copy it out to the tarball */
936 if (S_ISREG(statbuf->st_mode)) {
939 ssize_t size=0, readSize=0;
941 /* open the file we want to archive, and make sure all is well */
942 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
943 errorMsg("%s: Cannot open: %s\n", fileName, strerror(errno));
947 /* write the file to the archive */
948 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
949 if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
950 /* Output file seems to have a problem */
951 errorMsg(io_error, fileName, strerror(errno));
957 errorMsg(io_error, fileName, strerror(errno));
960 /* Pad the file up to the tar block size */
961 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
962 write(tbInfo->tarFd, "\0", 1);
970 static int writeTarFile(const char* tarName, int tostdoutFlag,
971 int verboseFlag, int argc, char **argv, char** excludeList)
976 struct TarBallInfo tbInfo;
977 tbInfo.verboseFlag = verboseFlag;
979 /* Make sure there is at least one file to tar up. */
981 fatalError("Cowardly refusing to create an empty archive\n");
983 /* Open the tar file for writing. */
984 if (tostdoutFlag == TRUE)
985 tbInfo.tarFd = fileno(stdout);
987 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
988 if (tbInfo.tarFd < 0) {
989 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
992 tbInfo.excludeList=excludeList;
993 /* Store the stat info for the tarball's file, so
994 * can avoid including the tarball into itself.... */
995 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
996 fatalError(io_error, tarName, strerror(errno));
998 /* Set the umask for this process so it doesn't
999 * screw up permission setting for us later. */
1002 /* Read the directory/files and iterate over them one at a time */
1003 while (argc-- > 0) {
1004 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
1005 writeFileToTarball, writeFileToTarball,
1006 (void*) &tbInfo) == FALSE) {
1010 /* Write two empty blocks to the end of the archive */
1011 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
1012 write(tbInfo.tarFd, "\0", 1);
1015 /* To be pedantically correct, we would check if the tarball
1016 * is smaller then 20 tar blocks, and pad it if it was smaller,
1017 * but that isn't necessary for GNU tar interoperability, and
1018 * so is considered a waste of space */
1020 /* Hang up the tools, close up shop, head home */
1022 if (errorFlag == TRUE) {
1023 errorMsg("Error exit delayed from previous errors\n");