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>
55 /* Tar file constants */
57 #define MAJOR(dev) (((dev)>>8)&0xff)
58 #define MINOR(dev) ((dev)&0xff)
61 enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
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 static const int TAR_MAGIC_LEN = 6;
92 static const int TAR_VERSION_LEN = 2;
93 static const int 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(int tarFd, int extractFlag, int listFlag,
133 int tostdoutFlag, int verboseFlag, char** extractList,
136 #ifdef BB_FEATURE_TAR_CREATE
137 /* Local procedures to save files into a tar file. */
138 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
142 #if defined BB_FEATURE_TAR_EXCLUDE
143 static struct option longopts[] = {
144 { "exclude", 1, NULL, 'e' },
149 extern int tar_main(int argc, char **argv)
151 char** excludeList=NULL;
152 char** extractList=NULL;
153 const char *tarName="-";
154 #if defined BB_FEATURE_TAR_EXCLUDE
155 int excludeListSize=0;
159 #if defined BB_FEATURE_TAR_GZIP
160 FILE *comp_file = NULL;
161 int unzipFlag = FALSE;
163 int listFlag = FALSE;
164 int extractFlag = FALSE;
165 int createFlag = FALSE;
166 int verboseFlag = FALSE;
167 int tostdoutFlag = FALSE;
175 if (argv[1][0] != '-') {
176 char *tmp = xmalloc(strlen(argv[1]) + 2);
178 strcpy(tmp + 1, argv[1]);
183 #ifndef BB_FEATURE_TAR_EXCLUDE
184 (opt = getopt(argc, argv, "cxtzvOf:p"))
186 (opt = getopt_long(argc, argv, "cxtzvOf:X:p", longopts, NULL))
191 if (extractFlag == TRUE || listFlag == TRUE)
196 if (listFlag == TRUE || createFlag == TRUE)
201 if (extractFlag == TRUE || createFlag == TRUE)
205 #ifdef BB_FEATURE_TAR_GZIP
218 error_msg_and_die( "Only one 'f' option allowed");
221 #if defined BB_FEATURE_TAR_EXCLUDE
223 excludeList=xrealloc( excludeList,
224 sizeof(char *) * (excludeListSize+2));
225 excludeList[excludeListSize] = optarg;
226 /* Tack a NULL onto the end of the list */
227 excludeList[++excludeListSize] = NULL;
229 fileList = xfopen(optarg, "r");
230 while (fgets(file, sizeof(file), fileList) != NULL) {
231 excludeList = xrealloc(excludeList,
232 sizeof(char *) * (excludeListSize+2));
234 excludeList[excludeListSize] = xstrdup(file);
235 /* Tack a NULL onto the end of the list */
236 excludeList[++excludeListSize] = NULL;
249 * Do the correct type of action supplying the rest of the
250 * command line arguments as the list of files to process.
252 if (createFlag == TRUE) {
253 #ifndef BB_FEATURE_TAR_CREATE
254 error_msg_and_die( "This version of tar was not compiled with tar creation support.");
256 #ifdef BB_FEATURE_TAR_GZIP
258 error_msg_and_die("Creation of compressed not internally support by tar, pipe to busybox gunzip");
260 status = writeTarFile(tarName, verboseFlag, argv + optind, excludeList);
263 if (listFlag == TRUE || extractFlag == TRUE) {
266 extractList = argv + optind;
267 /* Open the tar file for reading. */
268 if (!strcmp(tarName, "-"))
269 tarFd = fileno(stdin);
271 tarFd = open(tarName, O_RDONLY);
273 perror_msg_and_die("Error opening '%s'", tarName);
275 #ifdef BB_FEATURE_TAR_GZIP
276 /* unzip tarFd in a seperate process */
277 if (unzipFlag == TRUE) {
278 comp_file = fdopen(tarFd, "r");
279 if ((tarFd = fileno(gz_open(comp_file, &pid))) == EXIT_FAILURE) {
280 error_msg_and_die("Couldnt unzip file");
284 status = readTarFile(tarFd, extractFlag, listFlag, tostdoutFlag,
285 verboseFlag, extractList, excludeList);
287 #ifdef BB_FEATURE_TAR_GZIP
288 if (unzipFlag == TRUE) {
301 error_msg_and_die( "Exactly one of 'c', 'x' or 't' must be specified");
305 fixUpPermissions(TarInfo *header)
308 /* Now set permissions etc. for the new file */
309 chown(header->name, header->uid, header->gid);
310 chmod(header->name, header->mode);
313 t.modtime = header->mtime;
314 utime(header->name, &t);
318 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
322 size_t actualWriteSz;
324 size_t size = header->size;
325 int outFd=fileno(stdout);
327 /* Open the file to be written, if a file is supposed to be written */
328 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
329 /* Create the path to the file, just in case it isn't there...
330 * This should not screw up path permissions or anything. */
331 create_path(header->name, 0777);
332 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
333 header->mode & ~S_IFMT)) < 0) {
334 error_msg(io_error, header->name, strerror(errno));
339 /* Write out the file, if we are supposed to be doing that */
342 if ( size > sizeof(buffer) )
343 writeSize = readSize = sizeof(buffer);
345 int mod = size % 512;
347 readSize = size + (512 - mod);
352 if ( (readSize = full_read(header->tarFd, buffer, readSize)) <= 0 ) {
353 /* Tarball seems to have a problem */
354 error_msg("Unexpected EOF in archive");
357 if ( readSize < writeSize )
358 writeSize = readSize;
360 /* Write out the file, if we are supposed to be doing that */
361 if (extractFlag==TRUE) {
363 if ((actualWriteSz=full_write(outFd, buffer, writeSize)) != writeSize ) {
364 /* Output file seems to have a problem */
365 error_msg(io_error, header->name, strerror(errno));
369 actualWriteSz=writeSize;
372 size -= actualWriteSz;
375 /* Now we are done writing the file out, so try
376 * and fix up the permissions and whatnot */
377 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
379 fixUpPermissions(header);
385 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
387 if (extractFlag==FALSE || tostdoutFlag==TRUE)
390 if (create_path(header->name, header->mode) != TRUE) {
391 perror_msg("%s: Cannot mkdir", header->name);
394 /* make the final component, just in case it was
395 * omitted by create_path() (which will skip the
396 * directory if it doesn't have a terminating '/') */
397 if (mkdir(header->name, header->mode) < 0 && errno != EEXIST) {
398 perror_msg("%s", header->name);
402 fixUpPermissions(header);
407 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
409 if (extractFlag==FALSE || tostdoutFlag==TRUE)
412 if (link(header->linkname, header->name) < 0) {
413 perror_msg("%s: Cannot create hard link to '%s'", header->name,
418 /* Now set permissions etc. for the new directory */
419 fixUpPermissions(header);
424 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
426 if (extractFlag==FALSE || tostdoutFlag==TRUE)
430 if (symlink(header->linkname, header->name) < 0) {
431 perror_msg("%s: Cannot create symlink to '%s'", header->name,
435 /* Try to change ownership of the symlink.
436 * If libs doesn't support that, don't bother.
437 * Changing the pointed-to-file is the Wrong Thing(tm).
439 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
440 lchown(header->name, header->uid, header->gid);
443 /* Do not change permissions or date on symlink,
444 * since it changes the pointed to file instead. duh. */
446 error_msg("%s: Cannot create symlink to '%s': %s",
447 header->name, header->linkname,
448 "symlinks not supported");
454 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
456 if (extractFlag==FALSE || tostdoutFlag==TRUE)
459 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
460 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
461 perror_msg("%s: Cannot mknod", header->name);
464 } else if (S_ISFIFO(header->mode)) {
465 if (mkfifo(header->name, header->mode) < 0) {
466 perror_msg("%s: Cannot mkfifo", header->name);
471 /* Now set permissions etc. for the new directory */
472 fixUpPermissions(header);
476 /* Parse the tar header and fill in the nice struct with the details */
478 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
482 unsigned char *s = (unsigned char *)rawHeader;
484 header->name = rawHeader->name;
485 /* Check for and relativify any absolute paths */
486 if ( *(header->name) == '/' ) {
487 static int alreadyWarned=FALSE;
489 while (*(header->name) == '/')
492 if (alreadyWarned == FALSE) {
493 error_msg("Removing leading '/' from member names");
494 alreadyWarned = TRUE;
498 header->mode = strtol(rawHeader->mode, NULL, 8);
499 header->uid = strtol(rawHeader->uid, NULL, 8);
500 header->gid = strtol(rawHeader->gid, NULL, 8);
501 header->size = strtol(rawHeader->size, NULL, 8);
502 header->mtime = strtol(rawHeader->mtime, NULL, 8);
503 chksum = strtol(rawHeader->chksum, NULL, 8);
504 header->type = rawHeader->typeflag;
505 header->linkname = rawHeader->linkname;
506 header->devmajor = strtol(rawHeader->devmajor, NULL, 8);
507 header->devminor = strtol(rawHeader->devminor, NULL, 8);
509 /* Check the checksum */
510 for (i = sizeof(*rawHeader); i-- != 0;) {
513 /* Remove the effects of the checksum field (replace
514 * with blanks for the purposes of the checksum) */
515 s = rawHeader->chksum;
516 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
519 sum += ' ' * sizeof(rawHeader->chksum);
525 static int exclude_file(char **excluded_files, const char *file)
529 if (excluded_files == NULL)
532 for (i = 0; excluded_files[i] != NULL; i++) {
533 if (excluded_files[i][0] == '/') {
534 if (fnmatch(excluded_files[i], file,
535 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
540 for (p = file; p[0] != '\0'; p++) {
541 if ((p == file || p[-1] == '/') && p[0] != '/' &&
542 fnmatch(excluded_files[i], p,
543 FNM_PATHNAME | FNM_LEADING_DIR) == 0)
552 static int extract_file(char **extract_files, const char *file)
556 if (extract_files == NULL)
559 for (i = 0; extract_files[i] != NULL; i++) {
560 if (fnmatch(extract_files[i], file, FNM_LEADING_DIR) == 0)
568 * Read a tar file and extract or list the specified files within it.
569 * If the list is empty than all files are extracted or listed.
571 static int readTarFile(int tarFd, int extractFlag, int listFlag,
572 int tostdoutFlag, int verboseFlag, char** extractList,
577 int skipNextHeaderFlag=FALSE;
581 /* Read the tar file, and iterate over it one file at a time */
582 while ( (status = full_read(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
584 /* Try to read the header */
585 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
586 if ( *(header.name) == '\0' ) {
590 error_msg("Bad tar header, skipping");
594 if ( *(header.name) == '\0' )
596 header.tarFd = tarFd;
598 /* Skip funky extra GNU headers that precede long files */
599 if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
600 skipNextHeaderFlag=TRUE;
601 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
605 if ( skipNextHeaderFlag == TRUE ) {
606 skipNextHeaderFlag=FALSE;
607 error_msg(name_longer_than_foo, NAME_SIZE);
608 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
613 #if defined BB_FEATURE_TAR_EXCLUDE
614 if (exclude_file(excludeList, header.name)) {
615 /* There are not the droids you're looking for, move along */
616 /* If it is a regular file, pretend to extract it with
617 * the extractFlag set to FALSE, so the junk in the tarball
618 * is properly skipped over */
619 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
620 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
627 if (!extract_file(extractList, header.name)) {
628 /* There are not the droids you're looking for, move along */
629 /* If it is a regular file, pretend to extract it with
630 * the extractFlag set to FALSE, so the junk in the tarball
631 * is properly skipped over */
632 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
633 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
639 if (listFlag == TRUE) {
640 /* Special treatment if the list (-t) flag is on */
641 if (verboseFlag == TRUE) {
644 struct tm *tm = localtime (&(header.mtime));
646 len=printf("%s ", mode_string(header.mode));
647 my_getpwuid(buf, header.uid);
649 len+=printf("%d", header.uid);
651 len+=printf("%s", buf);
652 my_getgrgid(buf, header.gid);
654 len+=printf("/%-d ", header.gid);
656 len+=printf("/%-s ", buf);
658 if (header.type==CHRTYPE || header.type==BLKTYPE) {
659 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
660 header.devmajor, header.devminor);
662 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
664 /* Jump through some hoops to make the columns match up */
665 for(;(len+len1)<31;len++)
669 /* Use ISO 8610 time format */
671 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
672 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
673 tm->tm_hour, tm->tm_min, tm->tm_sec);
676 printf("%s", header.name);
677 if (verboseFlag == TRUE) {
678 if (header.type==LNKTYPE) /* If this is a link, say so */
679 printf(" link to %s", header.linkname);
680 else if (header.type==SYMTYPE)
681 printf(" -> %s", header.linkname);
686 /* List contents if we are supposed to do that */
687 if (verboseFlag == TRUE && extractFlag == TRUE) {
688 /* Now the normal listing */
690 if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
692 fprintf(vbFd, "%s\n", header.name);
695 /* Remove files if we would overwrite them */
696 if (extractFlag == TRUE && tostdoutFlag == FALSE)
699 /* If we got here, we can be certain we have a legitimate
700 * header to work with. So work with it. */
701 switch ( header.type ) {
704 /* If the name ends in a '/' then assume it is
705 * supposed to be a directory, and fall through */
706 if (!last_char_is(header.name,'/')) {
707 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
712 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
716 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
720 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
726 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
730 /* Handled earlier */
733 skipNextHeaderFlag=TRUE;
737 error_msg("Unknown file type '%c' in tar file", header.type);
744 /* Bummer - we read a partial header */
745 perror_msg("Error reading tar file");
748 else if (errorFlag==TRUE) {
749 error_msg( "Error exit delayed from previous errors");
754 /* Stuff to do when we are done */
757 if ( *(header.name) == '\0' ) {
759 error_msg( "Error exit delayed from previous errors");
767 #ifdef BB_FEATURE_TAR_CREATE
770 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
771 ** the only functions that deal with the HardLinkInfo structure.
772 ** Even these functions use the xxxHardLinkInfo() functions.
774 typedef struct HardLinkInfo HardLinkInfo;
777 HardLinkInfo *next; /* Next entry in list */
778 dev_t dev; /* Device number */
779 ino_t ino; /* Inode number */
780 short linkCount; /* (Hard) Link Count */
781 char name[1]; /* Start of filename (must be last) */
784 /* Some info to be carried along when creating a new tarball */
787 char* fileName; /* File name of the tarball */
788 int tarFd; /* Open-for-write file descriptor
790 struct stat statBuf; /* Stat info for the tarball, letting
791 us know the inode and device that the
792 tarball lives, so we can avoid trying
793 to include the tarball into itself */
794 int verboseFlag; /* Whether to print extra stuff or not */
795 char** excludeList; /* List of files to not include */
796 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
797 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
799 typedef struct TarBallInfo TarBallInfo;
802 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
804 addHardLinkInfo (HardLinkInfo **hlInfoHeadPtr, dev_t dev, ino_t ino,
805 short linkCount, const char *name)
807 /* Note: hlInfoHeadPtr can never be NULL! */
808 HardLinkInfo *hlInfo;
810 hlInfo = (HardLinkInfo *)xmalloc(sizeof(HardLinkInfo)+strlen(name)+1);
812 hlInfo->next = *hlInfoHeadPtr;
813 *hlInfoHeadPtr = hlInfo;
816 hlInfo->linkCount = linkCount;
817 strcpy(hlInfo->name, name);
823 freeHardLinkInfo (HardLinkInfo **hlInfoHeadPtr)
825 HardLinkInfo *hlInfo = NULL;
826 HardLinkInfo *hlInfoNext = NULL;
829 hlInfo = *hlInfoHeadPtr;
831 hlInfoNext = hlInfo->next;
835 *hlInfoHeadPtr = NULL;
840 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
841 static HardLinkInfo *
842 findHardLinkInfo (HardLinkInfo *hlInfo, dev_t dev, ino_t ino)
845 if ((ino == hlInfo->ino) && (dev == hlInfo->dev))
847 hlInfo = hlInfo->next;
852 /* Put an octal string into the specified buffer.
853 * The number is zero and space padded and possibly null padded.
854 * Returns TRUE if successful. */
855 static int putOctal (char *cp, int len, long value)
859 char *tempString = tempBuffer;
861 /* Create a string of the specified length with an initial space,
862 * leading zeroes and the octal number, and a trailing null. */
863 sprintf (tempString, "%0*lo", len - 1, value);
865 /* If the string is too large, suppress the leading space. */
866 tempLength = strlen (tempString) + 1;
867 if (tempLength > len) {
872 /* If the string is still too large, suppress the trailing null. */
873 if (tempLength > len)
876 /* If the string is still too large, fail. */
877 if (tempLength > len)
880 /* Copy the string to the field. */
881 memcpy (cp, tempString, len);
886 /* Write out a tar header for the specified file/directory/whatever */
888 writeTarHeader(struct TarBallInfo *tbInfo, const char *header_name,
889 const char *real_name, struct stat *statbuf)
892 struct TarHeader header;
893 const unsigned char *cp = (const unsigned char *) &header;
894 ssize_t size = sizeof(struct TarHeader);
896 memset( &header, 0, size);
898 strncpy(header.name, header_name, sizeof(header.name));
900 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
901 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
902 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
903 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
904 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
905 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
906 TAR_MAGIC_LEN + TAR_VERSION_LEN );
908 /* Enter the user and group names (default to root if it fails) */
909 my_getpwuid(header.uname, statbuf->st_uid);
911 strcpy(header.uname, "root");
912 my_getgrgid(header.gname, statbuf->st_gid);
914 strcpy(header.uname, "root");
916 if (tbInfo->hlInfo) {
917 /* This is a hard link */
918 header.typeflag = LNKTYPE;
919 strncpy(header.linkname, tbInfo->hlInfo->name, sizeof(header.linkname));
920 } else if (S_ISLNK(statbuf->st_mode)) {
921 char *lpath = xreadlink(real_name);
922 if (!lpath) /* Already printed err msg inside xreadlink() */
924 header.typeflag = SYMTYPE;
925 strncpy(header.linkname, lpath, sizeof(header.linkname));
927 } else if (S_ISDIR(statbuf->st_mode)) {
928 header.typeflag = DIRTYPE;
929 strncat(header.name, "/", sizeof(header.name));
930 } else if (S_ISCHR(statbuf->st_mode)) {
931 header.typeflag = CHRTYPE;
932 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
933 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
934 } else if (S_ISBLK(statbuf->st_mode)) {
935 header.typeflag = BLKTYPE;
936 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
937 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
938 } else if (S_ISFIFO(statbuf->st_mode)) {
939 header.typeflag = FIFOTYPE;
940 } else if (S_ISREG(statbuf->st_mode)) {
941 header.typeflag = REGTYPE;
942 putOctal(header.size, sizeof(header.size), statbuf->st_size);
944 error_msg("%s: Unknown file type", real_name);
948 /* Calculate and store the checksum (i.e., the sum of all of the bytes of
949 * the header). The checksum field must be filled with blanks for the
950 * calculation. The checksum field is formatted differently from the
951 * other fields: it has [6] digits, a null, then a space -- rather than
952 * digits, followed by a null like the other fields... */
953 memset(header.chksum, ' ', sizeof(header.chksum));
954 cp = (const unsigned char *) &header;
957 putOctal(header.chksum, 7, chksum);
959 /* Now write the header out to disk */
960 if ((size=full_write(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
961 error_msg(io_error, real_name, strerror(errno));
964 /* Pad the header up to the tar block size */
965 for (; size<TAR_BLOCK_SIZE; size++) {
966 write(tbInfo->tarFd, "\0", 1);
968 /* Now do the verbose thing (or not) */
969 if (tbInfo->verboseFlag==TRUE) {
971 if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
973 fprintf(vbFd, "%s\n", header.name);
980 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
982 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
983 const char *header_name;
986 ** Check to see if we are dealing with a hard link.
988 ** Treat the first occurance of a given dev/inode as a file while
989 ** treating any additional occurances as hard links. This is done
990 ** by adding the file information to the HardLinkInfo linked list.
992 tbInfo->hlInfo = NULL;
993 if (statbuf->st_nlink > 1) {
994 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf->st_dev,
996 if (tbInfo->hlInfo == NULL)
997 addHardLinkInfo (&tbInfo->hlInfoHead, statbuf->st_dev,
998 statbuf->st_ino, statbuf->st_nlink, fileName);
1001 /* It is against the rules to archive a socket */
1002 if (S_ISSOCK(statbuf->st_mode)) {
1003 error_msg("%s: socket ignored", fileName);
1007 /* It is a bad idea to store the archive we are in the process of creating,
1008 * so check the device and inode to be sure that this particular file isn't
1009 * the new tarball */
1010 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
1011 tbInfo->statBuf.st_ino == statbuf->st_ino) {
1012 error_msg("%s: file is the archive; skipping", fileName);
1016 header_name = fileName;
1017 while (header_name[0] == '/') {
1018 static int alreadyWarned=FALSE;
1019 if (alreadyWarned==FALSE) {
1020 error_msg("Removing leading '/' from member names");
1026 if (strlen(fileName) >= NAME_SIZE) {
1027 error_msg(name_longer_than_foo, NAME_SIZE);
1031 if (header_name[0] == '\0')
1034 #if defined BB_FEATURE_TAR_EXCLUDE
1035 if (exclude_file(tbInfo->excludeList, header_name)) {
1040 if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) {
1044 /* Now, if the file is a regular file, copy it out to the tarball */
1045 if ((tbInfo->hlInfo == NULL)
1046 && (S_ISREG(statbuf->st_mode))) {
1048 char buffer[BUFSIZ];
1049 ssize_t size=0, readSize=0;
1051 /* open the file we want to archive, and make sure all is well */
1052 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
1053 error_msg("%s: Cannot open: %s", fileName, strerror(errno));
1057 /* write the file to the archive */
1058 while ( (size = full_read(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
1059 if (full_write(tbInfo->tarFd, buffer, size) != size ) {
1060 /* Output file seems to have a problem */
1061 error_msg(io_error, fileName, strerror(errno));
1067 error_msg(io_error, fileName, strerror(errno));
1070 /* Pad the file up to the tar block size */
1071 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
1072 write(tbInfo->tarFd, "\0", 1);
1074 close( inputFileFd);
1080 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
1084 int errorFlag=FALSE;
1086 struct TarBallInfo tbInfo;
1087 tbInfo.verboseFlag = verboseFlag;
1088 tbInfo.hlInfoHead = NULL;
1090 /* Make sure there is at least one file to tar up. */
1092 error_msg_and_die("Cowardly refusing to create an empty archive");
1094 /* Open the tar file for writing. */
1095 if (!strcmp(tarName, "-"))
1096 tbInfo.tarFd = fileno(stdout);
1098 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1099 if (tbInfo.tarFd < 0) {
1100 perror_msg( "Error opening '%s'", tarName);
1101 freeHardLinkInfo(&tbInfo.hlInfoHead);
1104 tbInfo.excludeList=excludeList;
1105 /* Store the stat info for the tarball's file, so
1106 * can avoid including the tarball into itself.... */
1107 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
1108 error_msg_and_die(io_error, tarName, strerror(errno));
1110 /* Read the directory/files and iterate over them one at a time */
1111 while (*argv != NULL) {
1112 if (recursive_action(*argv++, TRUE, FALSE, FALSE,
1113 writeFileToTarball, writeFileToTarball,
1114 (void*) &tbInfo) == FALSE) {
1118 /* Write two empty blocks to the end of the archive */
1119 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
1120 write(tbInfo.tarFd, "\0", 1);
1123 /* To be pedantically correct, we would check if the tarball
1124 * is smaller than 20 tar blocks, and pad it if it was smaller,
1125 * but that isn't necessary for GNU tar interoperability, and
1126 * so is considered a waste of space */
1128 /* Hang up the tools, close up shop, head home */
1130 if (errorFlag == TRUE) {
1131 error_msg("Error exit delayed from previous errors");
1132 freeHardLinkInfo(&tbInfo.hlInfoHead);
1135 freeHardLinkInfo(&tbInfo.hlInfoHead);