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) 1999,2000,2001 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
46 #include <sys/types.h>
47 #include <sys/sysmacros.h>
54 #define BB_DECLARE_EXTERN
55 #define bb_need_io_error
56 #define bb_need_name_longer_than_foo
59 #ifdef BB_FEATURE_TAR_GZIP
60 extern int unzip(int in, int out);
61 extern int gz_open(FILE *compressed_file, int *pid);
62 extern void gz_close(int gunzip_pid);
65 /* Tar file constants */
67 #define MAJOR(dev) (((dev)>>8)&0xff)
68 #define MINOR(dev) ((dev)&0xff)
71 enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
73 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
77 char name[NAME_SIZE]; /* 0-99 */
78 char mode[8]; /* 100-107 */
79 char uid[8]; /* 108-115 */
80 char gid[8]; /* 116-123 */
81 char size[12]; /* 124-135 */
82 char mtime[12]; /* 136-147 */
83 char chksum[8]; /* 148-155 */
84 char typeflag; /* 156-156 */
85 char linkname[NAME_SIZE]; /* 157-256 */
86 char magic[6]; /* 257-262 */
87 char version[2]; /* 263-264 */
88 char uname[32]; /* 265-296 */
89 char gname[32]; /* 297-328 */
90 char devmajor[8]; /* 329-336 */
91 char devminor[8]; /* 337-344 */
92 char prefix[155]; /* 345-499 */
93 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
95 typedef struct TarHeader TarHeader;
98 /* A few useful constants */
99 #define TAR_MAGIC "ustar" /* ustar and a null */
100 #define TAR_VERSION " " /* Be compatable with GNU tar format */
101 static const int TAR_MAGIC_LEN = 6;
102 static const int TAR_VERSION_LEN = 2;
103 static const int TAR_BLOCK_SIZE = 512;
105 /* A nice enum with all the possible tar file content types */
108 REGTYPE = '0', /* regular file */
109 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
110 LNKTYPE = '1', /* hard link */
111 SYMTYPE = '2', /* symbolic link */
112 CHRTYPE = '3', /* character special */
113 BLKTYPE = '4', /* block special */
114 DIRTYPE = '5', /* directory */
115 FIFOTYPE = '6', /* FIFO special */
116 CONTTYPE = '7', /* reserved */
117 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
118 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
120 typedef enum TarFileType TarFileType;
122 /* This struct ignores magic, non-numeric user name,
123 * non-numeric group name, and the checksum, since
124 * these are all ignored by BusyBox tar. */
127 int tarFd; /* An open file descriptor for reading from the tarball */
128 char * name; /* File name */
129 mode_t mode; /* Unix mode, including device bits. */
130 uid_t uid; /* Numeric UID */
131 gid_t gid; /* Numeric GID */
132 size_t size; /* Size of file */
133 time_t mtime; /* Last-modified time */
134 enum TarFileType type; /* Regular, directory, link, etc */
135 char * linkname; /* Name for symbolic and hard links */
136 long devmajor; /* Major number for special device */
137 long devminor; /* Minor number for special device */
139 typedef struct TarInfo TarInfo;
141 /* Local procedures to restore files from a tar file. */
142 extern int readTarFile(int tarFd, int extractFlag, int listFlag,
143 int tostdoutFlag, int verboseFlag, char** extractList,
146 #ifdef BB_FEATURE_TAR_CREATE
147 /* Local procedures to save files into a tar file. */
148 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
152 #if defined BB_FEATURE_TAR_EXCLUDE
153 static struct option longopts[] = {
154 { "exclude", 1, NULL, 'e' },
159 extern int tar_main(int argc, char **argv)
161 char** excludeList=NULL;
162 char** extractList=NULL;
163 const char *tarName="-";
164 #if defined BB_FEATURE_TAR_EXCLUDE
165 int excludeListSize=0;
169 #if defined BB_FEATURE_TAR_GZIP
170 FILE *comp_file = NULL;
171 int unzipFlag = FALSE;
173 int listFlag = FALSE;
174 int extractFlag = FALSE;
175 int createFlag = FALSE;
176 int verboseFlag = FALSE;
177 int tostdoutFlag = FALSE;
185 if (argv[1][0] != '-') {
186 char *tmp = xmalloc(strlen(argv[1]) + 2);
188 strcpy(tmp + 1, argv[1]);
193 #ifndef BB_FEATURE_TAR_EXCLUDE
194 (opt = getopt(argc, argv, "cxtzvOf:"))
196 (opt = getopt_long(argc, argv, "cxtzvOf:X:", longopts, NULL))
201 if (extractFlag == TRUE || listFlag == TRUE)
206 if (listFlag == TRUE || createFlag == TRUE)
211 if (extractFlag == TRUE || createFlag == TRUE)
215 #ifdef BB_FEATURE_TAR_GZIP
228 error_msg_and_die( "Only one 'f' option allowed");
231 #if defined BB_FEATURE_TAR_EXCLUDE
233 excludeList=xrealloc( excludeList,
234 sizeof(char *) * (excludeListSize+2));
235 excludeList[excludeListSize] = optarg;
236 /* Tack a NULL onto the end of the list */
237 excludeList[++excludeListSize] = NULL;
239 fileList = xfopen(optarg, "r");
240 while (fgets(file, sizeof(file), fileList) != NULL) {
241 excludeList = xrealloc(excludeList,
242 sizeof(char *) * (excludeListSize+2));
244 excludeList[excludeListSize] = xstrdup(file);
245 /* Tack a NULL onto the end of the list */
246 excludeList[++excludeListSize] = NULL;
257 * Do the correct type of action supplying the rest of the
258 * command line arguments as the list of files to process.
260 if (createFlag == TRUE) {
261 #ifndef BB_FEATURE_TAR_CREATE
262 error_msg_and_die( "This version of tar was not compiled with tar creation support.");
264 #ifdef BB_FEATURE_TAR_GZIP
266 error_msg_and_die("Creation of compressed not internally support by tar, pipe to busybox gunzip");
268 status = writeTarFile(tarName, verboseFlag, argv + optind, excludeList);
271 if (listFlag == TRUE || extractFlag == TRUE) {
274 extractList = argv + optind;
275 /* Open the tar file for reading. */
276 if (!strcmp(tarName, "-"))
277 tarFd = fileno(stdin);
279 tarFd = open(tarName, O_RDONLY);
281 perror_msg_and_die("Error opening '%s'", tarName);
283 #ifdef BB_FEATURE_TAR_GZIP
284 /* unzip tarFd in a seperate process */
285 if (unzipFlag == TRUE) {
286 comp_file = fdopen(tarFd, "r");
287 if ((tarFd = gz_open(comp_file, &pid)) == EXIT_FAILURE) {
288 error_msg_and_die("Couldnt unzip file");
292 status = readTarFile(tarFd, extractFlag, listFlag, tostdoutFlag,
293 verboseFlag, extractList, excludeList);
295 #ifdef BB_FEATURE_TAR_GZIP
296 if (unzipFlag == TRUE) {
309 error_msg_and_die( "Exactly one of 'c', 'x' or 't' must be specified");
313 fixUpPermissions(TarInfo *header)
316 /* Now set permissions etc for the new file */
317 chown(header->name, header->uid, header->gid);
318 chmod(header->name, header->mode);
321 t.modtime = header->mtime;
322 utime(header->name, &t);
326 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
330 size_t actualWriteSz;
332 size_t size = header->size;
333 int outFd=fileno(stdout);
335 /* Open the file to be written, if a file is supposed to be written */
336 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
337 /* Create the path to the file, just in case it isn't there...
338 * This should not screw up path permissions or anything. */
339 create_path(header->name, 0777);
340 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
341 header->mode & ~S_IFMT)) < 0) {
342 error_msg(io_error, header->name, strerror(errno));
347 /* Write out the file, if we are supposed to be doing that */
350 if ( size > sizeof(buffer) )
351 writeSize = readSize = sizeof(buffer);
353 int mod = size % 512;
355 readSize = size + (512 - mod);
360 if ( (readSize = full_read(header->tarFd, buffer, readSize)) <= 0 ) {
361 /* Tarball seems to have a problem */
362 error_msg("Unexpected EOF in archive");
365 if ( readSize < writeSize )
366 writeSize = readSize;
368 /* Write out the file, if we are supposed to be doing that */
369 if (extractFlag==TRUE) {
371 if ((actualWriteSz=full_write(outFd, buffer, writeSize)) != writeSize ) {
372 /* Output file seems to have a problem */
373 error_msg(io_error, header->name, strerror(errno));
377 actualWriteSz=writeSize;
380 size -= actualWriteSz;
383 /* Now we are done writing the file out, so try
384 * and fix up the permissions and whatnot */
385 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
387 fixUpPermissions(header);
393 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
396 if (extractFlag==FALSE || tostdoutFlag==TRUE)
399 if (create_path(header->name, header->mode) != TRUE) {
400 perror_msg("%s: Cannot mkdir", header->name);
403 /* make the final component, just in case it was
404 * omitted by create_path() (which will skip the
405 * directory if it doesn't have a terminating '/') */
406 if (mkdir(header->name, header->mode) < 0 && errno != EEXIST) {
407 perror_msg("%s", header->name);
411 fixUpPermissions(header);
416 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
418 if (extractFlag==FALSE || tostdoutFlag==TRUE)
421 if (link(header->linkname, header->name) < 0) {
422 perror_msg("%s: Cannot create hard link to '%s'", header->name,
427 /* Now set permissions etc for the new directory */
428 fixUpPermissions(header);
433 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
435 if (extractFlag==FALSE || tostdoutFlag==TRUE)
439 if (symlink(header->linkname, header->name) < 0) {
440 perror_msg("%s: Cannot create symlink to '%s'", header->name,
444 /* Try to change ownership of the symlink.
445 * If libs doesn't support that, don't bother.
446 * Changing the pointed-to-file is the Wrong Thing(tm).
448 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
449 lchown(header->name, header->uid, header->gid);
452 /* Do not change permissions or date on symlink,
453 * since it changes the pointed to file instead. duh. */
455 error_msg("%s: Cannot create symlink to '%s': %s",
456 header->name, header->linkname,
457 "symlinks not supported");
463 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
465 if (extractFlag==FALSE || tostdoutFlag==TRUE)
468 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
469 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
470 perror_msg("%s: Cannot mknod", header->name);
473 } else if (S_ISFIFO(header->mode)) {
474 if (mkfifo(header->name, header->mode) < 0) {
475 perror_msg("%s: Cannot mkfifo", header->name);
480 /* Now set permissions etc for the new directory */
481 fixUpPermissions(header);
485 /* Read an octal value in a field of the specified width, with optional
486 * spaces on both sides of the number and with an optional null character
487 * at the end. Returns -1 on an illegal format. */
488 static long getOctal(const char *cp, int size)
492 for(;(size > 0) && (*cp == ' '); cp++, size--);
493 if ((size == 0) || !is_octal(*cp))
495 for(; (size > 0) && is_octal(*cp); size--) {
496 val = val * 8 + *cp++ - '0';
498 for (;(size > 0) && (*cp == ' '); cp++, size--);
499 if ((size > 0) && *cp)
505 /* Parse the tar header and fill in the nice struct with the details */
507 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
511 unsigned char *s = (unsigned char *)rawHeader;
513 header->name = rawHeader->name;
514 /* Check for and relativify any absolute paths */
515 if ( *(header->name) == '/' ) {
516 static int alreadyWarned=FALSE;
518 while (*(header->name) == '/')
521 if (alreadyWarned == FALSE) {
522 error_msg("Removing leading '/' from member names");
523 alreadyWarned = TRUE;
527 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
528 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
529 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
530 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
531 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
532 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
533 header->type = rawHeader->typeflag;
534 header->linkname = rawHeader->linkname;
535 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
536 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
538 /* Check the checksum */
539 for (i = sizeof(*rawHeader); i-- != 0;) {
542 /* Remove the effects of the checksum field (replace
543 * with blanks for the purposes of the checksum) */
544 s = rawHeader->chksum;
545 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
548 sum += ' ' * sizeof(rawHeader->chksum);
554 static int exclude_file(char **excluded_files, const char *file)
558 if (excluded_files == NULL)
561 for (i = 0; excluded_files[i] != NULL; i++) {
562 if (excluded_files[i][0] == '/') {
563 if (fnmatch(excluded_files[i], file,
564 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
569 for (p = file; p[0] != '\0'; p++) {
570 if ((p == file || p[-1] == '/') && p[0] != '/' &&
571 fnmatch(excluded_files[i], p,
572 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
581 static int extract_file(char **extract_files, const char *file)
585 if (extract_files == NULL)
588 for (i = 0; extract_files[i] != NULL; i++) {
589 if (fnmatch(extract_files[i], file, FNM_LEADING_DIR) == 0)
597 * Read a tar file and extract or list the specified files within it.
598 * If the list is empty than all files are extracted or listed.
600 extern int readTarFile(int tarFd, int extractFlag, int listFlag,
601 int tostdoutFlag, int verboseFlag, char** extractList,
606 int skipNextHeaderFlag=FALSE;
610 /* Set the umask for this process so it doesn't
611 * screw up permission setting for us later. */
614 /* Read the tar file, and iterate over it one file at a time */
615 while ( (status = full_read(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
617 /* Try to read the header */
618 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
619 if ( *(header.name) == '\0' ) {
623 error_msg("Bad tar header, skipping");
627 if ( *(header.name) == '\0' )
629 header.tarFd = tarFd;
631 /* Skip funky extra GNU headers that precede long files */
632 if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
633 skipNextHeaderFlag=TRUE;
634 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
638 if ( skipNextHeaderFlag == TRUE ) {
639 skipNextHeaderFlag=FALSE;
640 error_msg(name_longer_than_foo, NAME_SIZE);
641 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
646 #if defined BB_FEATURE_TAR_EXCLUDE
647 if (exclude_file(excludeList, header.name)) {
648 /* There are not the droids you're looking for, move along */
649 /* If it is a regular file, pretend to extract it with
650 * the extractFlag set to FALSE, so the junk in the tarball
651 * is properly skipped over */
652 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
653 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
660 if (!extract_file(extractList, header.name)) {
661 /* There are not the droids you're looking for, move along */
662 /* If it is a regular file, pretend to extract it with
663 * the extractFlag set to FALSE, so the junk in the tarball
664 * is properly skipped over */
665 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
666 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
672 if (listFlag == TRUE) {
673 /* Special treatment if the list (-t) flag is on */
674 if (verboseFlag == TRUE) {
677 struct tm *tm = localtime (&(header.mtime));
679 len=printf("%s ", mode_string(header.mode));
680 my_getpwuid(buf, header.uid);
682 len+=printf("%d", header.uid);
684 len+=printf("%s", buf);
685 my_getgrgid(buf, header.gid);
687 len+=printf("/%-d ", header.gid);
689 len+=printf("/%-s ", buf);
691 if (header.type==CHRTYPE || header.type==BLKTYPE) {
692 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
693 header.devmajor, header.devminor);
695 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
697 /* Jump through some hoops to make the columns match up */
698 for(;(len+len1)<31;len++)
702 /* Use ISO 8610 time format */
704 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
705 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
706 tm->tm_hour, tm->tm_min, tm->tm_sec);
709 printf("%s", header.name);
710 if (verboseFlag == TRUE) {
711 if (header.type==LNKTYPE) /* If this is a link, say so */
712 printf(" link to %s", header.linkname);
713 else if (header.type==SYMTYPE)
714 printf(" -> %s", header.linkname);
719 /* List contents if we are supposed to do that */
720 if (verboseFlag == TRUE && extractFlag == TRUE) {
721 /* Now the normal listing */
723 if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
725 fprintf(vbFd, "%s\n", header.name);
728 /* Remove files if we would overwrite them */
729 if (extractFlag == TRUE && tostdoutFlag == FALSE)
732 /* If we got here, we can be certain we have a legitimate
733 * header to work with. So work with it. */
734 switch ( header.type ) {
737 /* If the name ends in a '/' then assume it is
738 * supposed to be a directory, and fall through */
739 if (header.name[strlen(header.name)-1] != '/') {
740 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
745 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
749 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
753 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
759 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
763 /* Handled earlier */
766 skipNextHeaderFlag=TRUE;
770 error_msg("Unknown file type '%c' in tar file", header.type);
777 /* Bummer - we read a partial header */
778 perror_msg("Error reading tar file");
781 else if (errorFlag==TRUE) {
782 error_msg( "Error exit delayed from previous errors");
787 /* Stuff to do when we are done */
790 if ( *(header.name) == '\0' ) {
792 error_msg( "Error exit delayed from previous errors");
800 #ifdef BB_FEATURE_TAR_CREATE
803 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
804 ** the only functions that deal with the HardLinkInfo structure.
805 ** Even these functions use the xxxHardLinkInfo() functions.
807 typedef struct HardLinkInfo HardLinkInfo;
810 HardLinkInfo *next; /* Next entry in list */
811 dev_t dev; /* Device number */
812 ino_t ino; /* Inode number */
813 short linkCount; /* (Hard) Link Count */
814 char name[1]; /* Start of filename (must be last) */
817 /* Some info to be carried along when creating a new tarball */
820 char* fileName; /* File name of the tarball */
821 int tarFd; /* Open-for-write file descriptor
823 struct stat statBuf; /* Stat info for the tarball, letting
824 us know the inode and device that the
825 tarball lives, so we can avoid trying
826 to include the tarball into itself */
827 int verboseFlag; /* Whether to print extra stuff or not */
828 char** excludeList; /* List of files to not include */
829 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
830 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
832 typedef struct TarBallInfo TarBallInfo;
835 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
837 addHardLinkInfo (HardLinkInfo **hlInfoHeadPtr, dev_t dev, ino_t ino,
838 short linkCount, const char *name)
840 /* Note: hlInfoHeadPtr can never be NULL! */
841 HardLinkInfo *hlInfo;
843 hlInfo = (HardLinkInfo *)xmalloc(sizeof(HardLinkInfo)+strlen(name)+1);
845 hlInfo->next = *hlInfoHeadPtr;
846 *hlInfoHeadPtr = hlInfo;
849 hlInfo->linkCount = linkCount;
850 strcpy(hlInfo->name, name);
856 freeHardLinkInfo (HardLinkInfo **hlInfoHeadPtr)
858 HardLinkInfo *hlInfo = NULL;
859 HardLinkInfo *hlInfoNext = NULL;
862 hlInfo = *hlInfoHeadPtr;
864 hlInfoNext = hlInfo->next;
868 *hlInfoHeadPtr = NULL;
873 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
874 static HardLinkInfo *
875 findHardLinkInfo (HardLinkInfo *hlInfo, dev_t dev, ino_t ino)
878 if ((ino == hlInfo->ino) && (dev == hlInfo->dev))
880 hlInfo = hlInfo->next;
885 /* Put an octal string into the specified buffer.
886 * The number is zero and space padded and possibly null padded.
887 * Returns TRUE if successful. */
888 static int putOctal (char *cp, int len, long value)
892 char *tempString = tempBuffer;
894 /* Create a string of the specified length with an initial space,
895 * leading zeroes and the octal number, and a trailing null. */
896 sprintf (tempString, "%0*lo", len - 1, value);
898 /* If the string is too large, suppress the leading space. */
899 tempLength = strlen (tempString) + 1;
900 if (tempLength > len) {
905 /* If the string is still too large, suppress the trailing null. */
906 if (tempLength > len)
909 /* If the string is still too large, fail. */
910 if (tempLength > len)
913 /* Copy the string to the field. */
914 memcpy (cp, tempString, len);
919 /* Write out a tar header for the specified file/directory/whatever */
921 writeTarHeader(struct TarBallInfo *tbInfo, const char *header_name,
922 const char *real_name, struct stat *statbuf)
925 struct TarHeader header;
926 const unsigned char *cp = (const unsigned char *) &header;
927 ssize_t size = sizeof(struct TarHeader);
929 memset( &header, 0, size);
931 strncpy(header.name, header_name, sizeof(header.name));
933 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
934 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
935 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
936 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
937 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
938 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
939 TAR_MAGIC_LEN + TAR_VERSION_LEN );
941 /* Enter the user and group names (default to root if it fails) */
942 my_getpwuid(header.uname, statbuf->st_uid);
944 strcpy(header.uname, "root");
945 my_getgrgid(header.gname, statbuf->st_gid);
947 strcpy(header.uname, "root");
949 if (tbInfo->hlInfo) {
950 /* This is a hard link */
951 header.typeflag = LNKTYPE;
952 strncpy(header.linkname, tbInfo->hlInfo->name, sizeof(header.linkname));
953 } else if (S_ISLNK(statbuf->st_mode)) {
956 header.typeflag = SYMTYPE;
957 link_size = readlink(real_name, buffer, sizeof(buffer) - 1);
958 if ( link_size < 0) {
959 perror_msg("Error reading symlink '%s'", header.name);
962 buffer[link_size] = '\0';
963 strncpy(header.linkname, buffer, sizeof(header.linkname));
964 } else if (S_ISDIR(statbuf->st_mode)) {
965 header.typeflag = DIRTYPE;
966 strncat(header.name, "/", sizeof(header.name));
967 } else if (S_ISCHR(statbuf->st_mode)) {
968 header.typeflag = CHRTYPE;
969 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
970 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
971 } else if (S_ISBLK(statbuf->st_mode)) {
972 header.typeflag = BLKTYPE;
973 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
974 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
975 } else if (S_ISFIFO(statbuf->st_mode)) {
976 header.typeflag = FIFOTYPE;
977 } else if (S_ISREG(statbuf->st_mode)) {
978 header.typeflag = REGTYPE;
979 putOctal(header.size, sizeof(header.size), statbuf->st_size);
981 error_msg("%s: Unknown file type", real_name);
985 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
986 * the header). The checksum field must be filled with blanks for the
987 * calculation. The checksum field is formatted differently from the
988 * other fields: it has [6] digits, a null, then a space -- rather than
989 * digits, followed by a null like the other fields... */
990 memset(header.chksum, ' ', sizeof(header.chksum));
991 cp = (const unsigned char *) &header;
994 putOctal(header.chksum, 7, chksum);
996 /* Now write the header out to disk */
997 if ((size=full_write(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
998 error_msg(io_error, real_name, strerror(errno));
1001 /* Pad the header up to the tar block size */
1002 for (; size<TAR_BLOCK_SIZE; size++) {
1003 write(tbInfo->tarFd, "\0", 1);
1005 /* Now do the verbose thing (or not) */
1006 if (tbInfo->verboseFlag==TRUE) {
1007 FILE *vbFd = stdout;
1008 if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
1010 fprintf(vbFd, "%s\n", header.name);
1017 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
1019 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
1020 const char *header_name;
1023 ** Check to see if we are dealing with a hard link.
1025 ** Treat the first occurance of a given dev/inode as a file while
1026 ** treating any additional occurances as hard links. This is done
1027 ** by adding the file information to the HardLinkInfo linked list.
1029 tbInfo->hlInfo = NULL;
1030 if (statbuf->st_nlink > 1) {
1031 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf->st_dev,
1033 if (tbInfo->hlInfo == NULL)
1034 addHardLinkInfo (&tbInfo->hlInfoHead, statbuf->st_dev,
1035 statbuf->st_ino, statbuf->st_nlink, fileName);
1038 /* It is against the rules to archive a socket */
1039 if (S_ISSOCK(statbuf->st_mode)) {
1040 error_msg("%s: socket ignored", fileName);
1044 /* It is a bad idea to store the archive we are in the process of creating,
1045 * so check the device and inode to be sure that this particular file isn't
1046 * the new tarball */
1047 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
1048 tbInfo->statBuf.st_ino == statbuf->st_ino) {
1049 error_msg("%s: file is the archive; skipping", fileName);
1053 header_name = fileName;
1054 while (header_name[0] == '/') {
1055 static int alreadyWarned=FALSE;
1056 if (alreadyWarned==FALSE) {
1057 error_msg("Removing leading '/' from member names");
1063 if (strlen(fileName) >= NAME_SIZE) {
1064 error_msg(name_longer_than_foo, NAME_SIZE);
1068 if (header_name[0] == '\0')
1071 #if defined BB_FEATURE_TAR_EXCLUDE
1072 if (exclude_file(tbInfo->excludeList, header_name)) {
1077 if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) {
1081 /* Now, if the file is a regular file, copy it out to the tarball */
1082 if ((tbInfo->hlInfo == NULL)
1083 && (S_ISREG(statbuf->st_mode))) {
1085 char buffer[BUFSIZ];
1086 ssize_t size=0, readSize=0;
1088 /* open the file we want to archive, and make sure all is well */
1089 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
1090 error_msg("%s: Cannot open: %s", fileName, strerror(errno));
1094 /* write the file to the archive */
1095 while ( (size = full_read(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
1096 if (full_write(tbInfo->tarFd, buffer, size) != size ) {
1097 /* Output file seems to have a problem */
1098 error_msg(io_error, fileName, strerror(errno));
1104 error_msg(io_error, fileName, strerror(errno));
1107 /* Pad the file up to the tar block size */
1108 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
1109 write(tbInfo->tarFd, "\0", 1);
1111 close( inputFileFd);
1117 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
1121 int errorFlag=FALSE;
1123 struct TarBallInfo tbInfo;
1124 tbInfo.verboseFlag = verboseFlag;
1125 tbInfo.hlInfoHead = NULL;
1127 /* Make sure there is at least one file to tar up. */
1129 error_msg_and_die("Cowardly refusing to create an empty archive");
1131 /* Open the tar file for writing. */
1132 if (!strcmp(tarName, "-"))
1133 tbInfo.tarFd = fileno(stdout);
1135 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1136 if (tbInfo.tarFd < 0) {
1137 perror_msg( "Error opening '%s'", tarName);
1138 freeHardLinkInfo(&tbInfo.hlInfoHead);
1141 tbInfo.excludeList=excludeList;
1142 /* Store the stat info for the tarball's file, so
1143 * can avoid including the tarball into itself.... */
1144 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
1145 error_msg_and_die(io_error, tarName, strerror(errno));
1147 /* Set the umask for this process so it doesn't
1148 * screw up permission setting for us later. */
1151 /* Read the directory/files and iterate over them one at a time */
1152 while (*argv != NULL) {
1153 if (recursive_action(*argv++, TRUE, FALSE, FALSE,
1154 writeFileToTarball, writeFileToTarball,
1155 (void*) &tbInfo) == FALSE) {
1159 /* Write two empty blocks to the end of the archive */
1160 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
1161 write(tbInfo.tarFd, "\0", 1);
1164 /* To be pedantically correct, we would check if the tarball
1165 * is smaller than 20 tar blocks, and pad it if it was smaller,
1166 * but that isn't necessary for GNU tar interoperability, and
1167 * so is considered a waste of space */
1169 /* Hang up the tools, close up shop, head home */
1171 if (errorFlag == TRUE) {
1172 error_msg("Error exit delayed from previous errors");
1173 freeHardLinkInfo(&tbInfo.hlInfoHead);
1176 freeHardLinkInfo(&tbInfo.hlInfoHead);