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_than_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 verboseFlag, char **argv,
144 extern int tar_main(int argc, char **argv)
146 char** excludeList=NULL;
147 char** extractList=NULL;
148 #if defined BB_FEATURE_TAR_EXCLUDE
149 int excludeListSize=0;
150 char *excludeFileName ="-";
154 const char *tarName="-";
155 int listFlag = FALSE;
156 int extractFlag = FALSE;
157 int createFlag = FALSE;
158 int verboseFlag = FALSE;
159 int tostdoutFlag = FALSE;
168 while (*(++argv) && (**argv == '-' || firstOpt == TRUE)) {
171 while (stopIt==FALSE && **argv) {
172 switch (*((*argv)++)) {
174 if (extractFlag == TRUE || listFlag == TRUE)
179 if (listFlag == TRUE || createFlag == TRUE)
184 if (extractFlag == TRUE || createFlag == TRUE)
196 fatalError( "Only one 'f' option allowed\n");
199 fatalError( "Option requires an argument: No file specified\n");
202 #if defined BB_FEATURE_TAR_EXCLUDE
204 if (strcmp(*argv, "xclude")==0) {
205 excludeList=xrealloc( excludeList, sizeof(char**) * (excludeListSize+2));
206 excludeList[excludeListSize] = *(++argv);
207 if (excludeList[excludeListSize] == NULL)
208 fatalError( "Option requires an argument: No file specified\n");
209 /* Remove leading "/"s */
210 if (*excludeList[excludeListSize] =='/')
211 excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
212 /* Tack a NULL onto the end of the list */
213 excludeList[++excludeListSize] = NULL;
218 if (*excludeFileName != '-')
219 fatalError("Only one 'X' option allowed\n");
220 excludeFileName = *(++argv);
221 if (excludeFileName == NULL)
222 fatalError("Option requires an argument: No file specified\n");
223 fileList = fopen (excludeFileName, "rt");
225 fatalError("Exclude file: file not found\n");
226 while (!feof(fileList)) {
227 fscanf(fileList, "%s", file);
228 excludeList=xrealloc( excludeList, sizeof(char**) * (excludeListSize+2));
229 excludeList[excludeListSize] = malloc(sizeof(char) * (strlen(file)+1));
230 strcpy(excludeList[excludeListSize],file);
231 /* Remove leading "/"s */
232 if (*excludeList[excludeListSize] == '/')
233 excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
234 /* Tack a NULL onto the end of the list */
235 excludeList[++excludeListSize] = NULL;
251 * Do the correct type of action supplying the rest of the
252 * command line arguments as the list of files to process.
254 if (createFlag == TRUE) {
255 #ifndef BB_FEATURE_TAR_CREATE
256 fatalError( "This version of tar was not compiled with tar creation support.\n");
258 status = writeTarFile(tarName, verboseFlag, argv, excludeList);
261 if (listFlag == TRUE || extractFlag == TRUE) {
264 status = readTarFile(tarName, extractFlag, listFlag, tostdoutFlag,
265 verboseFlag, extractList, excludeList);
274 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
278 fixUpPermissions(TarInfo *header)
281 /* Now set permissions etc for the new file */
282 chown(header->name, header->uid, header->gid);
283 chmod(header->name, header->mode);
286 t.modtime = header->mtime;
287 utime(header->name, &t);
291 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
295 size_t actualWriteSz;
297 size_t size = header->size;
298 int outFd=fileno(stdout);
300 /* Open the file to be written, if a file is supposed to be written */
301 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
302 /* Create the path to the file, just in case it isn't there...
303 * This should not screw up path permissions or anything. */
304 createPath(header->name, 0777);
305 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
306 header->mode & ~S_IFMT)) < 0) {
307 errorMsg(io_error, header->name, strerror(errno));
312 /* Write out the file, if we are supposed to be doing that */
315 if ( size > sizeof(buffer) )
316 writeSize = readSize = sizeof(buffer);
318 int mod = size % 512;
320 readSize = size + (512 - mod);
325 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
326 /* Tarball seems to have a problem */
327 errorMsg("Unexpected EOF in archive\n");
330 if ( readSize < writeSize )
331 writeSize = readSize;
333 /* Write out the file, if we are supposed to be doing that */
334 if (extractFlag==TRUE) {
336 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
337 /* Output file seems to have a problem */
338 errorMsg(io_error, header->name, strerror(errno));
342 actualWriteSz=writeSize;
345 size -= actualWriteSz;
348 /* Now we are done writing the file out, so try
349 * and fix up the permissions and whatnot */
350 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
352 fixUpPermissions(header);
358 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
361 if (extractFlag==FALSE || tostdoutFlag==TRUE)
364 if (createPath(header->name, header->mode) != TRUE) {
365 errorMsg("%s: Cannot mkdir: %s\n",
366 header->name, strerror(errno));
369 /* make the final component, just in case it was
370 * omitted by createPath() (which will skip the
371 * directory if it doesn't have a terminating '/') */
372 if (mkdir(header->name, header->mode) == 0) {
373 fixUpPermissions(header);
379 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
381 if (extractFlag==FALSE || tostdoutFlag==TRUE)
384 if (link(header->linkname, header->name) < 0) {
385 errorMsg("%s: Cannot create hard link to '%s': %s\n",
386 header->name, header->linkname, strerror(errno));
390 /* Now set permissions etc for the new directory */
391 fixUpPermissions(header);
396 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
398 if (extractFlag==FALSE || tostdoutFlag==TRUE)
402 if (symlink(header->linkname, header->name) < 0) {
403 errorMsg("%s: Cannot create symlink to '%s': %s\n",
404 header->name, header->linkname, strerror(errno));
407 /* Try to change ownership of the symlink.
408 * If libs doesn't support that, don't bother.
409 * Changing the pointed-to-file is the Wrong Thing(tm).
411 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
412 lchown(header->name, header->uid, header->gid);
415 /* Do not change permissions or date on symlink,
416 * since it changes the pointed to file instead. duh. */
418 errorMsg("%s: Cannot create symlink to '%s': %s\n",
419 header->name, header->linkname,
420 "symlinks not supported");
426 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
428 if (extractFlag==FALSE || tostdoutFlag==TRUE)
431 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
432 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
433 errorMsg("%s: Cannot mknod: %s\n",
434 header->name, strerror(errno));
437 } else if (S_ISFIFO(header->mode)) {
438 if (mkfifo(header->name, header->mode) < 0) {
439 errorMsg("%s: Cannot mkfifo: %s\n",
440 header->name, strerror(errno));
445 /* Now set permissions etc for the new directory */
446 fixUpPermissions(header);
450 /* Read an octal value in a field of the specified width, with optional
451 * spaces on both sides of the number and with an optional null character
452 * at the end. Returns -1 on an illegal format. */
453 static long getOctal(const char *cp, int size)
457 for(;(size > 0) && (*cp == ' '); cp++, size--);
458 if ((size == 0) || !isOctal(*cp))
460 for(; (size > 0) && isOctal(*cp); size--) {
461 val = val * 8 + *cp++ - '0';
463 for (;(size > 0) && (*cp == ' '); cp++, size--);
464 if ((size > 0) && *cp)
470 /* Parse the tar header and fill in the nice struct with the details */
472 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
476 unsigned char *s = (unsigned char *)rawHeader;
478 header->name = rawHeader->name;
479 /* Check for and relativify any absolute paths */
480 if ( *(header->name) == '/' ) {
481 static int alreadyWarned=FALSE;
483 while (*(header->name) == '/')
486 if (alreadyWarned == FALSE) {
487 errorMsg("Removing leading '/' from member names\n");
488 alreadyWarned = TRUE;
492 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
493 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
494 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
495 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
496 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
497 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
498 header->type = rawHeader->typeflag;
499 header->linkname = rawHeader->linkname;
500 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
501 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
503 /* Check the checksum */
504 for (i = sizeof(*rawHeader); i-- != 0;) {
507 /* Remove the effects of the checksum field (replace
508 * with blanks for the purposes of the checksum) */
509 s = rawHeader->chksum;
510 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
513 sum += ' ' * sizeof(rawHeader->chksum);
521 * Read a tar file and extract or list the specified files within it.
522 * If the list is empty than all files are extracted or listed.
524 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
525 int tostdoutFlag, int verboseFlag, char** extractList,
528 int status, tarFd=-1;
530 int skipNextHeaderFlag=FALSE;
535 /* Open the tar file for reading. */
536 if (!strcmp(tarName, "-"))
537 tarFd = fileno(stdin);
539 tarFd = open(tarName, O_RDONLY);
541 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
545 /* Set the umask for this process so it doesn't
546 * screw up permission setting for us later. */
549 /* Read the tar file, and iterate over it one file at a time */
550 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
552 /* Try to read the header */
553 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
554 if ( *(header.name) == '\0' ) {
558 errorMsg("Bad tar header, skipping\n");
562 if ( *(header.name) == '\0' )
564 header.tarFd = tarFd;
566 /* Skip funky extra GNU headers that precede long files */
567 if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
568 skipNextHeaderFlag=TRUE;
569 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
573 if ( skipNextHeaderFlag == TRUE ) {
574 skipNextHeaderFlag=FALSE;
575 errorMsg(name_longer_than_foo, NAME_SIZE);
576 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
581 #if defined BB_FEATURE_TAR_EXCLUDE
584 /* Check for excluded files.... */
585 for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
586 /* Do some extra hoop jumping for when directory names
587 * end in '/' but the entry in tmpList doesn't */
588 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
589 header.name[strlen(header.name)-1]=='/'
590 && strncmp( *tmpList, header.name,
591 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
592 /* If it is a regular file, pretend to extract it with
593 * the extractFlag set to FALSE, so the junk in the tarball
594 * is properly skipped over */
595 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
596 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
603 /* There are not the droids you're looking for, move along */
608 if (extractList != NULL) {
610 for (tmpList = extractList; *tmpList != NULL; tmpList++) {
611 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
612 header.name[strlen(header.name)-1]=='/'
613 && strncmp( *tmpList, header.name,
614 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
615 /* If it is a regular file, pretend to extract it with
616 * the extractFlag set to FALSE, so the junk in the tarball
617 * is properly skipped over */
619 memmove(extractList+1, extractList,
620 sizeof(*extractList)*(tmpList-extractList));
625 /* There are not the droids you're looking for, move along */
626 if (skipFlag == TRUE) {
627 if ( header.type==REGTYPE || header.type==REGTYPE0 )
628 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
634 if (listFlag == TRUE) {
635 /* Special treatment if the list (-t) flag is on */
636 if (verboseFlag == TRUE) {
639 struct tm *tm = localtime (&(header.mtime));
641 len=printf("%s ", modeString(header.mode));
642 memset(buf, 0, 8*sizeof(char));
643 my_getpwuid(buf, header.uid);
645 len+=printf("%d", header.uid);
647 len+=printf("%s", buf);
648 memset(buf, 0, 8*sizeof(char));
649 my_getgrgid(buf, header.gid);
651 len+=printf("/%-d ", header.gid);
653 len+=printf("/%-s ", buf);
655 if (header.type==CHRTYPE || header.type==BLKTYPE) {
656 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
657 header.devmajor, header.devminor);
659 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
661 /* Jump through some hoops to make the columns match up */
662 for(;(len+len1)<31;len++)
666 /* Use ISO 8610 time format */
668 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
669 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
670 tm->tm_hour, tm->tm_min, tm->tm_sec);
673 printf("%s", header.name);
674 if (verboseFlag == TRUE) {
675 if (header.type==LNKTYPE) /* If this is a link, say so */
676 printf(" link to %s", header.linkname);
677 else if (header.type==SYMTYPE)
678 printf(" -> %s", header.linkname);
683 /* List contents if we are supposed to do that */
684 if (verboseFlag == TRUE && extractFlag == TRUE) {
685 /* Now the normal listing */
687 if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
689 fprintf(vbFd, "%s\n", header.name);
692 /* Remove files if we would overwrite them */
693 if (extractFlag == TRUE && tostdoutFlag == FALSE)
696 /* If we got here, we can be certain we have a legitimate
697 * header to work with. So work with it. */
698 switch ( header.type ) {
701 /* If the name ends in a '/' then assume it is
702 * supposed to be a directory, and fall through */
703 if (header.name[strlen(header.name)-1] != '/') {
704 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
709 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
713 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
717 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
723 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
727 /* Handled earlier */
730 skipNextHeaderFlag=TRUE;
734 errorMsg("Unknown file type '%c' in tar file\n", header.type);
741 /* Bummer - we read a partial header */
742 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
745 else if (errorFlag==TRUE) {
746 errorMsg( "Error exit delayed from previous errors\n");
751 /* Stuff to do when we are done */
754 if (extractList != NULL) {
755 for (; *extractList != NULL; extractList++) {
756 errorMsg("%s: Not found in archive\n", *extractList);
760 if ( *(header.name) == '\0' ) {
762 errorMsg( "Error exit delayed from previous errors\n");
770 #ifdef BB_FEATURE_TAR_CREATE
772 /* Some info to be carried along when creating a new tarball */
775 char* fileName; /* File name of the tarball */
776 int tarFd; /* Open-for-write file descriptor
778 struct stat statBuf; /* Stat info for the tarball, letting
779 us know the inode and device that the
780 tarball lives, so we can avoid trying
781 to include the tarball into itself */
782 int verboseFlag; /* Whether to print extra stuff or not */
783 char** excludeList; /* List of files to not include */
785 typedef struct TarBallInfo TarBallInfo;
788 /* Put an octal string into the specified buffer.
789 * The number is zero and space padded and possibly null padded.
790 * Returns TRUE if successful. */
791 static int putOctal (char *cp, int len, long value)
795 char *tempString = tempBuffer;
797 /* Create a string of the specified length with an initial space,
798 * leading zeroes and the octal number, and a trailing null. */
799 sprintf (tempString, "%0*lo", len - 1, value);
801 /* If the string is too large, suppress the leading space. */
802 tempLength = strlen (tempString) + 1;
803 if (tempLength > len) {
808 /* If the string is still too large, suppress the trailing null. */
809 if (tempLength > len)
812 /* If the string is still too large, fail. */
813 if (tempLength > len)
816 /* Copy the string to the field. */
817 memcpy (cp, tempString, len);
822 /* Write out a tar header for the specified file/directory/whatever */
824 writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
827 struct TarHeader header;
828 #if defined BB_FEATURE_TAR_EXCLUDE
831 const unsigned char *cp = (const unsigned char *) &header;
832 ssize_t size = sizeof(struct TarHeader);
834 memset( &header, 0, size);
836 if (*fileName=='/') {
837 static int alreadyWarned=FALSE;
838 if (alreadyWarned==FALSE) {
839 errorMsg("Removing leading '/' from member names\n");
842 strncpy(header.name, fileName+1, sizeof(header.name));
845 strncpy(header.name, fileName, sizeof(header.name));
848 #if defined BB_FEATURE_TAR_EXCLUDE
849 /* Check for excluded files.... */
850 for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
851 /* Do some extra hoop jumping for when directory names
852 * end in '/' but the entry in tmpList doesn't */
853 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
854 header.name[strlen(header.name)-1]=='/'
855 && strncmp( *tmpList, header.name,
856 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
857 /* Set the mode to something that is not a regular file, thereby
858 * faking out writeTarFile into thinking that nothing further need
859 * be done for this file. Yes, I know this is ugly, but it works. */
860 statbuf->st_mode = 0;
866 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
867 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
868 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
869 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
870 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
871 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
872 TAR_MAGIC_LEN + TAR_VERSION_LEN );
874 /* Enter the user and group names (default to root if it fails) */
875 my_getpwuid(header.uname, statbuf->st_uid);
877 strcpy(header.uname, "root");
878 my_getgrgid(header.gname, statbuf->st_gid);
880 strcpy(header.uname, "root");
882 /* WARNING/NOTICE: I break Hard Links */
883 if (S_ISLNK(statbuf->st_mode)) {
886 header.typeflag = SYMTYPE;
887 link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
888 if ( link_size < 0) {
889 errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
892 buffer[link_size] = '\0';
893 strncpy(header.linkname, buffer, sizeof(header.linkname));
894 } else if (S_ISDIR(statbuf->st_mode)) {
895 header.typeflag = DIRTYPE;
896 strncat(header.name, "/", sizeof(header.name));
897 } else if (S_ISCHR(statbuf->st_mode)) {
898 header.typeflag = CHRTYPE;
899 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
900 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
901 } else if (S_ISBLK(statbuf->st_mode)) {
902 header.typeflag = BLKTYPE;
903 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
904 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
905 } else if (S_ISFIFO(statbuf->st_mode)) {
906 header.typeflag = FIFOTYPE;
907 } else if (S_ISREG(statbuf->st_mode)) {
908 header.typeflag = REGTYPE;
909 putOctal(header.size, sizeof(header.size), statbuf->st_size);
911 errorMsg("%s: Unknown file type\n", fileName);
915 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
916 * the header). The checksum field must be filled with blanks for the
917 * calculation. The checksum field is formatted differently from the
918 * other fields: it has [6] digits, a null, then a space -- rather than
919 * digits, followed by a null like the other fields... */
920 memset(header.chksum, ' ', sizeof(header.chksum));
921 cp = (const unsigned char *) &header;
924 putOctal(header.chksum, 7, chksum);
926 /* Now write the header out to disk */
927 if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
928 errorMsg(io_error, fileName, strerror(errno));
931 /* Pad the header up to the tar block size */
932 for (; size<TAR_BLOCK_SIZE; size++) {
933 write(tbInfo->tarFd, "\0", 1);
935 /* Now do the verbose thing (or not) */
936 if (tbInfo->verboseFlag==TRUE) {
938 if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
940 fprintf(vbFd, "%s\n", header.name);
947 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
949 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
951 /* It is against the rules to archive a socket */
952 if (S_ISSOCK(statbuf->st_mode)) {
953 errorMsg("%s: socket ignored\n", fileName);
957 /* It is a bad idea to store the archive we are in the process of creating,
958 * so check the device and inode to be sure that this particular file isn't
960 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
961 tbInfo->statBuf.st_ino == statbuf->st_ino) {
962 errorMsg("%s: file is the archive; skipping\n", fileName);
966 if (strlen(fileName) >= NAME_SIZE) {
967 errorMsg(name_longer_than_foo, NAME_SIZE);
971 if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
975 /* Now, if the file is a regular file, copy it out to the tarball */
976 if (S_ISREG(statbuf->st_mode)) {
979 ssize_t size=0, readSize=0;
981 /* open the file we want to archive, and make sure all is well */
982 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
983 errorMsg("%s: Cannot open: %s\n", fileName, strerror(errno));
987 /* write the file to the archive */
988 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
989 if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
990 /* Output file seems to have a problem */
991 errorMsg(io_error, fileName, strerror(errno));
997 errorMsg(io_error, fileName, strerror(errno));
1000 /* Pad the file up to the tar block size */
1001 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
1002 write(tbInfo->tarFd, "\0", 1);
1004 close( inputFileFd);
1010 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
1014 int errorFlag=FALSE;
1016 struct TarBallInfo tbInfo;
1017 tbInfo.verboseFlag = verboseFlag;
1019 /* Make sure there is at least one file to tar up. */
1021 fatalError("Cowardly refusing to create an empty archive\n");
1023 /* Open the tar file for writing. */
1024 if (!strcmp(tarName, "-"))
1025 tbInfo.tarFd = fileno(stdout);
1027 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1028 if (tbInfo.tarFd < 0) {
1029 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
1032 tbInfo.excludeList=excludeList;
1033 /* Store the stat info for the tarball's file, so
1034 * can avoid including the tarball into itself.... */
1035 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
1036 fatalError(io_error, tarName, strerror(errno));
1038 /* Set the umask for this process so it doesn't
1039 * screw up permission setting for us later. */
1042 /* Read the directory/files and iterate over them one at a time */
1043 while (*argv != NULL) {
1044 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
1045 writeFileToTarball, writeFileToTarball,
1046 (void*) &tbInfo) == FALSE) {
1050 /* Write two empty blocks to the end of the archive */
1051 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
1052 write(tbInfo.tarFd, "\0", 1);
1055 /* To be pedantically correct, we would check if the tarball
1056 * is smaller than 20 tar blocks, and pad it if it was smaller,
1057 * but that isn't necessary for GNU tar interoperability, and
1058 * so is considered a waste of space */
1060 /* Hang up the tools, close up shop, head home */
1062 if (errorFlag == TRUE) {
1063 errorMsg("Error exit delayed from previous errors\n");