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 #ifdef BB_FEATURE_TAR_GZIP
153 /* Signal handler for when child gzip process dies... */
154 static void child_died()
161 extern int tar_unzip_init(int tarFd)
164 static int unzip_pipe[2];
165 /* Cope if child dies... Otherwise we block forever in read()... */
166 signal(SIGCHLD, child_died);
168 if (pipe(unzip_pipe)!=0)
169 error_msg_and_die("pipe error");
171 if ( (child_pid = fork()) == -1)
172 error_msg_and_die("fork failure");
176 close(unzip_pipe[0]);
178 unzip(tarFd, unzip_pipe[1]);
182 /* return fd of uncompressed data to parent process */
183 close(unzip_pipe[1]);
184 return(unzip_pipe[0]);
189 #if defined BB_FEATURE_TAR_EXCLUDE
190 static struct option longopts[] = {
191 { "exclude", 1, NULL, 'e' },
196 extern int tar_main(int argc, char **argv)
198 char** excludeList=NULL;
199 char** extractList=NULL;
200 const char *tarName="-";
201 #if defined BB_FEATURE_TAR_EXCLUDE
202 int excludeListSize=0;
206 #if defined BB_FEATURE_TAR_GZIP
207 FILE *comp_file = NULL;
208 int unzipFlag = FALSE;
210 int listFlag = FALSE;
211 int extractFlag = FALSE;
212 int createFlag = FALSE;
213 int verboseFlag = FALSE;
214 int tostdoutFlag = FALSE;
222 if (argv[1][0] != '-') {
223 char *tmp = xmalloc(strlen(argv[1]) + 2);
225 strcpy(tmp + 1, argv[1]);
230 #ifndef BB_FEATURE_TAR_EXCLUDE
231 (opt = getopt(argc, argv, "cxtzvOf:"))
233 (opt = getopt_long(argc, argv, "cxtzvOf:X:", longopts, NULL))
238 if (extractFlag == TRUE || listFlag == TRUE)
243 if (listFlag == TRUE || createFlag == TRUE)
248 if (extractFlag == TRUE || createFlag == TRUE)
252 #ifdef BB_FEATURE_TAR_GZIP
265 error_msg_and_die( "Only one 'f' option allowed");
268 #if defined BB_FEATURE_TAR_EXCLUDE
270 excludeList=xrealloc( excludeList,
271 sizeof(char *) * (excludeListSize+2));
272 excludeList[excludeListSize] = optarg;
273 /* Tack a NULL onto the end of the list */
274 excludeList[++excludeListSize] = NULL;
276 fileList = xfopen(optarg, "r");
277 while (fgets(file, sizeof(file), fileList) != NULL) {
278 excludeList = xrealloc(excludeList,
279 sizeof(char *) * (excludeListSize+2));
281 excludeList[excludeListSize] = xstrdup(file);
282 /* Tack a NULL onto the end of the list */
283 excludeList[++excludeListSize] = NULL;
294 * Do the correct type of action supplying the rest of the
295 * command line arguments as the list of files to process.
297 if (createFlag == TRUE) {
298 #ifndef BB_FEATURE_TAR_CREATE
299 error_msg_and_die( "This version of tar was not compiled with tar creation support.");
301 #ifdef BB_FEATURE_TAR_GZIP
303 error_msg_and_die("Creation of compressed not internally support by tar, pipe to busybox gunzip");
305 status = writeTarFile(tarName, verboseFlag, argv + optind, excludeList);
308 if (listFlag == TRUE || extractFlag == TRUE) {
311 extractList = argv + optind;
312 /* Open the tar file for reading. */
313 if (!strcmp(tarName, "-"))
314 tarFd = fileno(stdin);
316 tarFd = open(tarName, O_RDONLY);
318 perror_msg_and_die("Error opening '%s'", tarName);
320 #ifdef BB_FEATURE_TAR_GZIP
321 /* unzip tarFd in a seperate process */
322 if (unzipFlag == TRUE) {
323 comp_file = fdopen(tarFd, "r");
325 if ((tarFd = gz_open(comp_file, &pid)) == EXIT_FAILURE) {
326 error_msg_and_die("Couldnt unzip file");
331 status = readTarFile(tarFd, extractFlag, listFlag, tostdoutFlag,
332 verboseFlag, extractList, excludeList);
336 #ifdef BB_FEATURE_TAR_GZIP
347 error_msg_and_die( "Exactly one of 'c', 'x' or 't' must be specified");
351 fixUpPermissions(TarInfo *header)
354 /* Now set permissions etc for the new file */
355 chown(header->name, header->uid, header->gid);
356 chmod(header->name, header->mode);
359 t.modtime = header->mtime;
360 utime(header->name, &t);
364 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
368 size_t actualWriteSz;
370 size_t size = header->size;
371 int outFd=fileno(stdout);
373 /* Open the file to be written, if a file is supposed to be written */
374 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
375 /* Create the path to the file, just in case it isn't there...
376 * This should not screw up path permissions or anything. */
377 create_path(header->name, 0777);
378 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
379 header->mode & ~S_IFMT)) < 0) {
380 error_msg(io_error, header->name, strerror(errno));
385 /* Write out the file, if we are supposed to be doing that */
388 if ( size > sizeof(buffer) )
389 writeSize = readSize = sizeof(buffer);
391 int mod = size % 512;
393 readSize = size + (512 - mod);
398 if ( (readSize = full_read(header->tarFd, buffer, readSize)) <= 0 ) {
399 /* Tarball seems to have a problem */
400 error_msg("Unexpected EOF in archive");
403 if ( readSize < writeSize )
404 writeSize = readSize;
406 /* Write out the file, if we are supposed to be doing that */
407 if (extractFlag==TRUE) {
409 if ((actualWriteSz=full_write(outFd, buffer, writeSize)) != writeSize ) {
410 /* Output file seems to have a problem */
411 error_msg(io_error, header->name, strerror(errno));
415 actualWriteSz=writeSize;
418 size -= actualWriteSz;
421 /* Now we are done writing the file out, so try
422 * and fix up the permissions and whatnot */
423 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
425 fixUpPermissions(header);
431 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
434 if (extractFlag==FALSE || tostdoutFlag==TRUE)
437 if (create_path(header->name, header->mode) != TRUE) {
438 perror_msg("%s: Cannot mkdir", header->name);
441 /* make the final component, just in case it was
442 * omitted by create_path() (which will skip the
443 * directory if it doesn't have a terminating '/') */
444 if (mkdir(header->name, header->mode) < 0 && errno != EEXIST) {
445 perror_msg("%s", header->name);
449 fixUpPermissions(header);
454 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
456 if (extractFlag==FALSE || tostdoutFlag==TRUE)
459 if (link(header->linkname, header->name) < 0) {
460 perror_msg("%s: Cannot create hard link to '%s'", header->name,
465 /* Now set permissions etc for the new directory */
466 fixUpPermissions(header);
471 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
473 if (extractFlag==FALSE || tostdoutFlag==TRUE)
477 if (symlink(header->linkname, header->name) < 0) {
478 perror_msg("%s: Cannot create symlink to '%s'", header->name,
482 /* Try to change ownership of the symlink.
483 * If libs doesn't support that, don't bother.
484 * Changing the pointed-to-file is the Wrong Thing(tm).
486 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
487 lchown(header->name, header->uid, header->gid);
490 /* Do not change permissions or date on symlink,
491 * since it changes the pointed to file instead. duh. */
493 error_msg("%s: Cannot create symlink to '%s': %s",
494 header->name, header->linkname,
495 "symlinks not supported");
501 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
503 if (extractFlag==FALSE || tostdoutFlag==TRUE)
506 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
507 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
508 perror_msg("%s: Cannot mknod", header->name);
511 } else if (S_ISFIFO(header->mode)) {
512 if (mkfifo(header->name, header->mode) < 0) {
513 perror_msg("%s: Cannot mkfifo", header->name);
518 /* Now set permissions etc for the new directory */
519 fixUpPermissions(header);
523 /* Read an octal value in a field of the specified width, with optional
524 * spaces on both sides of the number and with an optional null character
525 * at the end. Returns -1 on an illegal format. */
526 static long getOctal(const char *cp, int size)
530 for(;(size > 0) && (*cp == ' '); cp++, size--);
531 if ((size == 0) || !is_octal(*cp))
533 for(; (size > 0) && is_octal(*cp); size--) {
534 val = val * 8 + *cp++ - '0';
536 for (;(size > 0) && (*cp == ' '); cp++, size--);
537 if ((size > 0) && *cp)
543 /* Parse the tar header and fill in the nice struct with the details */
545 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
549 unsigned char *s = (unsigned char *)rawHeader;
551 header->name = rawHeader->name;
552 /* Check for and relativify any absolute paths */
553 if ( *(header->name) == '/' ) {
554 static int alreadyWarned=FALSE;
556 while (*(header->name) == '/')
559 if (alreadyWarned == FALSE) {
560 error_msg("Removing leading '/' from member names");
561 alreadyWarned = TRUE;
565 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
566 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
567 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
568 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
569 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
570 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
571 header->type = rawHeader->typeflag;
572 header->linkname = rawHeader->linkname;
573 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
574 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
576 /* Check the checksum */
577 for (i = sizeof(*rawHeader); i-- != 0;) {
580 /* Remove the effects of the checksum field (replace
581 * with blanks for the purposes of the checksum) */
582 s = rawHeader->chksum;
583 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
586 sum += ' ' * sizeof(rawHeader->chksum);
592 static int exclude_file(char **excluded_files, const char *file)
596 if (excluded_files == NULL)
599 for (i = 0; excluded_files[i] != NULL; i++) {
600 if (excluded_files[i][0] == '/') {
601 if (fnmatch(excluded_files[i], file,
602 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
607 for (p = file; p[0] != '\0'; p++) {
608 if ((p == file || p[-1] == '/') && p[0] != '/' &&
609 fnmatch(excluded_files[i], p,
610 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
619 static int extract_file(char **extract_files, const char *file)
623 if (extract_files == NULL)
626 for (i = 0; extract_files[i] != NULL; i++) {
627 if (fnmatch(extract_files[i], file, FNM_LEADING_DIR) == 0)
635 * Read a tar file and extract or list the specified files within it.
636 * If the list is empty than all files are extracted or listed.
638 extern int readTarFile(int tarFd, int extractFlag, int listFlag,
639 int tostdoutFlag, int verboseFlag, char** extractList,
644 int skipNextHeaderFlag=FALSE;
648 /* Set the umask for this process so it doesn't
649 * screw up permission setting for us later. */
652 /* Read the tar file, and iterate over it one file at a time */
653 while ( (status = full_read(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
655 /* Try to read the header */
656 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
657 if ( *(header.name) == '\0' ) {
661 error_msg("Bad tar header, skipping");
665 if ( *(header.name) == '\0' )
667 header.tarFd = tarFd;
669 /* Skip funky extra GNU headers that precede long files */
670 if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
671 skipNextHeaderFlag=TRUE;
672 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
676 if ( skipNextHeaderFlag == TRUE ) {
677 skipNextHeaderFlag=FALSE;
678 error_msg(name_longer_than_foo, NAME_SIZE);
679 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
684 #if defined BB_FEATURE_TAR_EXCLUDE
685 if (exclude_file(excludeList, header.name)) {
686 /* There are not the droids you're looking for, move along */
687 /* If it is a regular file, pretend to extract it with
688 * the extractFlag set to FALSE, so the junk in the tarball
689 * is properly skipped over */
690 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
691 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
698 if (!extract_file(extractList, header.name)) {
699 /* There are not the droids you're looking for, move along */
700 /* If it is a regular file, pretend to extract it with
701 * the extractFlag set to FALSE, so the junk in the tarball
702 * is properly skipped over */
703 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
704 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
710 if (listFlag == TRUE) {
711 /* Special treatment if the list (-t) flag is on */
712 if (verboseFlag == TRUE) {
715 struct tm *tm = localtime (&(header.mtime));
717 len=printf("%s ", mode_string(header.mode));
718 my_getpwuid(buf, header.uid);
720 len+=printf("%d", header.uid);
722 len+=printf("%s", buf);
723 my_getgrgid(buf, header.gid);
725 len+=printf("/%-d ", header.gid);
727 len+=printf("/%-s ", buf);
729 if (header.type==CHRTYPE || header.type==BLKTYPE) {
730 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
731 header.devmajor, header.devminor);
733 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
735 /* Jump through some hoops to make the columns match up */
736 for(;(len+len1)<31;len++)
740 /* Use ISO 8610 time format */
742 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
743 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
744 tm->tm_hour, tm->tm_min, tm->tm_sec);
747 printf("%s", header.name);
748 if (verboseFlag == TRUE) {
749 if (header.type==LNKTYPE) /* If this is a link, say so */
750 printf(" link to %s", header.linkname);
751 else if (header.type==SYMTYPE)
752 printf(" -> %s", header.linkname);
757 /* List contents if we are supposed to do that */
758 if (verboseFlag == TRUE && extractFlag == TRUE) {
759 /* Now the normal listing */
761 if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
763 fprintf(vbFd, "%s\n", header.name);
766 /* Remove files if we would overwrite them */
767 if (extractFlag == TRUE && tostdoutFlag == FALSE)
770 /* If we got here, we can be certain we have a legitimate
771 * header to work with. So work with it. */
772 switch ( header.type ) {
775 /* If the name ends in a '/' then assume it is
776 * supposed to be a directory, and fall through */
777 if (header.name[strlen(header.name)-1] != '/') {
778 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
783 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
787 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
791 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
797 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
801 /* Handled earlier */
804 skipNextHeaderFlag=TRUE;
808 error_msg("Unknown file type '%c' in tar file", header.type);
815 /* Bummer - we read a partial header */
816 perror_msg("Error reading tar file");
819 else if (errorFlag==TRUE) {
820 error_msg( "Error exit delayed from previous errors");
825 /* Stuff to do when we are done */
828 if ( *(header.name) == '\0' ) {
830 error_msg( "Error exit delayed from previous errors");
838 #ifdef BB_FEATURE_TAR_CREATE
841 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
842 ** the only functions that deal with the HardLinkInfo structure.
843 ** Even these functions use the xxxHardLinkInfo() functions.
845 typedef struct HardLinkInfo HardLinkInfo;
848 HardLinkInfo *next; /* Next entry in list */
849 dev_t dev; /* Device number */
850 ino_t ino; /* Inode number */
851 short linkCount; /* (Hard) Link Count */
852 char name[1]; /* Start of filename (must be last) */
855 /* Some info to be carried along when creating a new tarball */
858 char* fileName; /* File name of the tarball */
859 int tarFd; /* Open-for-write file descriptor
861 struct stat statBuf; /* Stat info for the tarball, letting
862 us know the inode and device that the
863 tarball lives, so we can avoid trying
864 to include the tarball into itself */
865 int verboseFlag; /* Whether to print extra stuff or not */
866 char** excludeList; /* List of files to not include */
867 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
868 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
870 typedef struct TarBallInfo TarBallInfo;
873 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
875 addHardLinkInfo (HardLinkInfo **hlInfoHeadPtr, dev_t dev, ino_t ino,
876 short linkCount, const char *name)
878 /* Note: hlInfoHeadPtr can never be NULL! */
879 HardLinkInfo *hlInfo;
881 hlInfo = (HardLinkInfo *)xmalloc(sizeof(HardLinkInfo)+strlen(name)+1);
883 hlInfo->next = *hlInfoHeadPtr;
884 *hlInfoHeadPtr = hlInfo;
887 hlInfo->linkCount = linkCount;
888 strcpy(hlInfo->name, name);
894 freeHardLinkInfo (HardLinkInfo **hlInfoHeadPtr)
896 HardLinkInfo *hlInfo = NULL;
897 HardLinkInfo *hlInfoNext = NULL;
900 hlInfo = *hlInfoHeadPtr;
902 hlInfoNext = hlInfo->next;
906 *hlInfoHeadPtr = NULL;
911 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
912 static HardLinkInfo *
913 findHardLinkInfo (HardLinkInfo *hlInfo, dev_t dev, ino_t ino)
916 if ((ino == hlInfo->ino) && (dev == hlInfo->dev))
918 hlInfo = hlInfo->next;
923 /* Put an octal string into the specified buffer.
924 * The number is zero and space padded and possibly null padded.
925 * Returns TRUE if successful. */
926 static int putOctal (char *cp, int len, long value)
930 char *tempString = tempBuffer;
932 /* Create a string of the specified length with an initial space,
933 * leading zeroes and the octal number, and a trailing null. */
934 sprintf (tempString, "%0*lo", len - 1, value);
936 /* If the string is too large, suppress the leading space. */
937 tempLength = strlen (tempString) + 1;
938 if (tempLength > len) {
943 /* If the string is still too large, suppress the trailing null. */
944 if (tempLength > len)
947 /* If the string is still too large, fail. */
948 if (tempLength > len)
951 /* Copy the string to the field. */
952 memcpy (cp, tempString, len);
957 /* Write out a tar header for the specified file/directory/whatever */
959 writeTarHeader(struct TarBallInfo *tbInfo, const char *header_name,
960 const char *real_name, struct stat *statbuf)
963 struct TarHeader header;
964 const unsigned char *cp = (const unsigned char *) &header;
965 ssize_t size = sizeof(struct TarHeader);
967 memset( &header, 0, size);
969 strncpy(header.name, header_name, sizeof(header.name));
971 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
972 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
973 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
974 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
975 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
976 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
977 TAR_MAGIC_LEN + TAR_VERSION_LEN );
979 /* Enter the user and group names (default to root if it fails) */
980 my_getpwuid(header.uname, statbuf->st_uid);
982 strcpy(header.uname, "root");
983 my_getgrgid(header.gname, statbuf->st_gid);
985 strcpy(header.uname, "root");
987 if (tbInfo->hlInfo) {
988 /* This is a hard link */
989 header.typeflag = LNKTYPE;
990 strncpy(header.linkname, tbInfo->hlInfo->name, sizeof(header.linkname));
991 } else if (S_ISLNK(statbuf->st_mode)) {
994 header.typeflag = SYMTYPE;
995 link_size = readlink(real_name, buffer, sizeof(buffer) - 1);
996 if ( link_size < 0) {
997 perror_msg("Error reading symlink '%s'", header.name);
1000 buffer[link_size] = '\0';
1001 strncpy(header.linkname, buffer, sizeof(header.linkname));
1002 } else if (S_ISDIR(statbuf->st_mode)) {
1003 header.typeflag = DIRTYPE;
1004 strncat(header.name, "/", sizeof(header.name));
1005 } else if (S_ISCHR(statbuf->st_mode)) {
1006 header.typeflag = CHRTYPE;
1007 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
1008 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
1009 } else if (S_ISBLK(statbuf->st_mode)) {
1010 header.typeflag = BLKTYPE;
1011 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
1012 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
1013 } else if (S_ISFIFO(statbuf->st_mode)) {
1014 header.typeflag = FIFOTYPE;
1015 } else if (S_ISREG(statbuf->st_mode)) {
1016 header.typeflag = REGTYPE;
1017 putOctal(header.size, sizeof(header.size), statbuf->st_size);
1019 error_msg("%s: Unknown file type", real_name);
1023 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
1024 * the header). The checksum field must be filled with blanks for the
1025 * calculation. The checksum field is formatted differently from the
1026 * other fields: it has [6] digits, a null, then a space -- rather than
1027 * digits, followed by a null like the other fields... */
1028 memset(header.chksum, ' ', sizeof(header.chksum));
1029 cp = (const unsigned char *) &header;
1032 putOctal(header.chksum, 7, chksum);
1034 /* Now write the header out to disk */
1035 if ((size=full_write(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
1036 error_msg(io_error, real_name, strerror(errno));
1039 /* Pad the header up to the tar block size */
1040 for (; size<TAR_BLOCK_SIZE; size++) {
1041 write(tbInfo->tarFd, "\0", 1);
1043 /* Now do the verbose thing (or not) */
1044 if (tbInfo->verboseFlag==TRUE) {
1045 FILE *vbFd = stdout;
1046 if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
1048 fprintf(vbFd, "%s\n", header.name);
1055 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
1057 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
1058 const char *header_name;
1061 ** Check to see if we are dealing with a hard link.
1063 ** Treat the first occurance of a given dev/inode as a file while
1064 ** treating any additional occurances as hard links. This is done
1065 ** by adding the file information to the HardLinkInfo linked list.
1067 tbInfo->hlInfo = NULL;
1068 if (statbuf->st_nlink > 1) {
1069 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf->st_dev,
1071 if (tbInfo->hlInfo == NULL)
1072 addHardLinkInfo (&tbInfo->hlInfoHead, statbuf->st_dev,
1073 statbuf->st_ino, statbuf->st_nlink, fileName);
1076 /* It is against the rules to archive a socket */
1077 if (S_ISSOCK(statbuf->st_mode)) {
1078 error_msg("%s: socket ignored", fileName);
1082 /* It is a bad idea to store the archive we are in the process of creating,
1083 * so check the device and inode to be sure that this particular file isn't
1084 * the new tarball */
1085 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
1086 tbInfo->statBuf.st_ino == statbuf->st_ino) {
1087 error_msg("%s: file is the archive; skipping", fileName);
1091 header_name = fileName;
1092 while (header_name[0] == '/') {
1093 static int alreadyWarned=FALSE;
1094 if (alreadyWarned==FALSE) {
1095 error_msg("Removing leading '/' from member names");
1101 if (strlen(fileName) >= NAME_SIZE) {
1102 error_msg(name_longer_than_foo, NAME_SIZE);
1106 if (header_name[0] == '\0')
1109 #if defined BB_FEATURE_TAR_EXCLUDE
1110 if (exclude_file(tbInfo->excludeList, header_name)) {
1115 if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) {
1119 /* Now, if the file is a regular file, copy it out to the tarball */
1120 if ((tbInfo->hlInfo == NULL)
1121 && (S_ISREG(statbuf->st_mode))) {
1123 char buffer[BUFSIZ];
1124 ssize_t size=0, readSize=0;
1126 /* open the file we want to archive, and make sure all is well */
1127 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
1128 error_msg("%s: Cannot open: %s", fileName, strerror(errno));
1132 /* write the file to the archive */
1133 while ( (size = full_read(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
1134 if (full_write(tbInfo->tarFd, buffer, size) != size ) {
1135 /* Output file seems to have a problem */
1136 error_msg(io_error, fileName, strerror(errno));
1142 error_msg(io_error, fileName, strerror(errno));
1145 /* Pad the file up to the tar block size */
1146 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
1147 write(tbInfo->tarFd, "\0", 1);
1149 close( inputFileFd);
1155 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
1159 int errorFlag=FALSE;
1161 struct TarBallInfo tbInfo;
1162 tbInfo.verboseFlag = verboseFlag;
1163 tbInfo.hlInfoHead = NULL;
1165 /* Make sure there is at least one file to tar up. */
1167 error_msg_and_die("Cowardly refusing to create an empty archive");
1169 /* Open the tar file for writing. */
1170 if (!strcmp(tarName, "-"))
1171 tbInfo.tarFd = fileno(stdout);
1173 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1174 if (tbInfo.tarFd < 0) {
1175 perror_msg( "Error opening '%s'", tarName);
1176 freeHardLinkInfo(&tbInfo.hlInfoHead);
1179 tbInfo.excludeList=excludeList;
1180 /* Store the stat info for the tarball's file, so
1181 * can avoid including the tarball into itself.... */
1182 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
1183 error_msg_and_die(io_error, tarName, strerror(errno));
1185 /* Set the umask for this process so it doesn't
1186 * screw up permission setting for us later. */
1189 /* Read the directory/files and iterate over them one at a time */
1190 while (*argv != NULL) {
1191 if (recursive_action(*argv++, TRUE, FALSE, FALSE,
1192 writeFileToTarball, writeFileToTarball,
1193 (void*) &tbInfo) == FALSE) {
1197 /* Write two empty blocks to the end of the archive */
1198 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
1199 write(tbInfo.tarFd, "\0", 1);
1202 /* To be pedantically correct, we would check if the tarball
1203 * is smaller than 20 tar blocks, and pad it if it was smaller,
1204 * but that isn't necessary for GNU tar interoperability, and
1205 * so is considered a waste of space */
1207 /* Hang up the tools, close up shop, head home */
1209 if (errorFlag == TRUE) {
1210 error_msg("Error exit delayed from previous errors");
1211 freeHardLinkInfo(&tbInfo.hlInfoHead);
1214 freeHardLinkInfo(&tbInfo.hlInfoHead);