/* vi: set sw=4 ts=4: */
/*
+ * Mini tar implementation for busybox
*
- * Mini tar implementation for busybox Note, that as of BusyBox 0.43 tar has
- * been completely rewritten from the ground up. It still has remnents of the
- * old code lying about, but it pretty different (i.e. cleaner, less global
- * variables, etc)
+ * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
+ * ground up. It still has remnents of the old code lying about, but it is
+ * very different now (i.e. cleaner, less global variables, etc)
*
- * Copyright (C) 1999 by Lineo, inc.
+ * Copyright (C) 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* Based in part in the tar implementation in sash
* provided that this copyright notice remains intact.
* Permission to distribute sash derived code under the GPL has been granted.
*
- * Based in part on the tar implementation in busybox-0.28
+ * Based in part on the tar implementation from busybox-0.28
* Copyright (C) 1995 Bruce Perens
* This is free software under the GNU General Public License.
*
#include <sys/param.h> /* for PATH_MAX */
-#ifdef BB_FEATURE_TAR_CREATE
-
static const char tar_usage[] =
- "tar -[cxtvOf] [tarFileName] [FILE] ...\n\n"
- "Create, extract, or list files from a tar file.\n\n"
- "Options:\n"
-
- "\tc=create, x=extract, t=list contents, v=verbose,\n"
- "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
-
+#ifdef BB_FEATURE_TAR_CREATE
+ "tar -[cxtvO] "
#else
-
-static const char tar_usage[] =
- "tar -[xtvOf] [tarFileName] [FILE] ...\n\n"
- "Extract, or list files stored in a tar file. This\n"
- "version of tar does not support creation of tar files.\n\n"
- "Options:\n"
-
- "\tx=extract, t=list contents, v=verbose,\n"
- "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
-
+ "tar -[xtvO] "
#endif
-
+#if defined BB_FEATURE_TAR_EXCLUDE
+ "[--exclude File] "
+#endif
+ "[-f tarFile] [FILE] ...\n\n"
+ "Create, extract, or list files from a tar file. Note that\n"
+ "this version of tar treats hard links as separate files.\n\n"
+ "Main operation mode:\n"
+#ifdef BB_FEATURE_TAR_CREATE
+ "\tc\t\tcreate\n"
+#endif
+ "\tx\t\textract\n"
+ "\tt\t\tlist\n"
+ "File selection:\n"
+ "\tf\t\tname of tarfile or \"-\" for stdin\n"
+ "\tO\t\textract to stdout\n"
+#if defined BB_FEATURE_TAR_EXCLUDE
+ "\t--exclude\tfile to exclude\n"
+#endif
+ "Informative output:\n"
+ "\tv\t\tverbosely list files processed\n"
+ ;
/* Tar file constants */
#ifndef MAJOR
struct TarHeader
{
/* byte offset */
- char name[100]; /* 0 */
- char mode[8]; /* 100 */
- char uid[8]; /* 108 */
- char gid[8]; /* 116 */
- char size[12]; /* 124 */
- char mtime[12]; /* 136 */
- char chksum[8]; /* 148 */
- char typeflag; /* 156 */
- char linkname[100]; /* 157 */
- char magic[6]; /* 257 */
- char version[2]; /* 263 */
- char uname[32]; /* 265 */
- char gname[32]; /* 297 */
- char devmajor[8]; /* 329 */
- char devminor[8]; /* 337 */
- char prefix[155]; /* 345 */
- /* padding 500 */
+ char name[100]; /* 0-99 */
+ char mode[8]; /* 100-107 */
+ char uid[8]; /* 108-115 */
+ char gid[8]; /* 116-123 */
+ char size[12]; /* 124-135 */
+ char mtime[12]; /* 136-147 */
+ char chksum[8]; /* 148-155 */
+ char typeflag; /* 156-156 */
+ char linkname[100]; /* 157-256 */
+ char magic[6]; /* 257-262 */
+ char version[2]; /* 263-264 */
+ char uname[32]; /* 265-296 */
+ char gname[32]; /* 297-328 */
+ char devmajor[8]; /* 329-336 */
+ char devminor[8]; /* 337-344 */
+ char prefix[155]; /* 345-499 */
+ char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
};
typedef struct TarHeader TarHeader;
/* A few useful constants */
#define TAR_MAGIC "ustar" /* ustar and a null */
-#define TAR_VERSION "00" /* 00 and no null */
+#define TAR_VERSION " " /* Be compatable with GNU tar format */
#define TAR_MAGIC_LEN 6
#define TAR_VERSION_LEN 2
-#define TAR_NAME_LEN 100
#define TAR_BLOCK_SIZE 512
/* A nice enum with all the possible tar file content types */
};
typedef struct TarInfo TarInfo;
-/* Static data */
-static const unsigned long TarChecksumOffset = (const unsigned long)&(((TarHeader *)0)->chksum);
-
-
/* Local procedures to restore files from a tar file. */
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag);
+ int tostdoutFlag, int verboseFlag, char** excludeList);
#ifdef BB_FEATURE_TAR_CREATE
/* Local procedures to save files into a tar file. */
-static int writeTarFile(const char* tarName, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, int argc, char **argv);
-static int putOctal(char *cp, int len, long value);
-
+static int writeTarFile(const char* tarName, int tostdoutFlag,
+ int verboseFlag, int argc, char **argv, char** excludeList);
#endif
extern int tar_main(int argc, char **argv)
{
+ char** excludeList=NULL;
+#if defined BB_FEATURE_TAR_EXCLUDE
+ int excludeListSize=0;
+#endif
const char *tarName=NULL;
- const char *options;
int listFlag = FALSE;
int extractFlag = FALSE;
int createFlag = FALSE;
int verboseFlag = FALSE;
int tostdoutFlag = FALSE;
+ int stopIt;
- argc--;
- argv++;
-
- if (argc < 1)
+ if (argc <= 1)
usage(tar_usage);
- /* Parse options */
- if (**argv == '-')
- options = (*argv++) + 1;
- else
- options = (*argv++);
- argc--;
-
- for (; *options; options++) {
- switch (*options) {
- case 'f':
- if (tarName != NULL)
- fatalError( "Only one 'f' option allowed\n");
-
- tarName = *argv++;
- if (tarName == NULL)
- fatalError( "Option requires an argument: No file specified\n");
- argc--;
-
- break;
-
- case 't':
- if (extractFlag == TRUE || createFlag == TRUE)
- goto flagError;
- listFlag = TRUE;
- break;
-
- case 'x':
- if (listFlag == TRUE || createFlag == TRUE)
- goto flagError;
- extractFlag = TRUE;
- break;
- case 'c':
- if (extractFlag == TRUE || listFlag == TRUE)
- goto flagError;
- createFlag = TRUE;
- break;
-
- case 'v':
- verboseFlag = TRUE;
- break;
-
- case 'O':
- tostdoutFlag = TRUE;
- break;
-
- case '-':
- usage(tar_usage);
- break;
-
- default:
- fatalError( "Unknown tar flag '%c'\n"
- "Try `tar --help' for more information\n", *options);
+ /* Parse any options */
+ while (--argc > 0 && **(++argv) == '-') {
+ stopIt=FALSE;
+ while (stopIt==FALSE && *(++(*argv))) {
+ switch (**argv) {
+ case 'f':
+ if (--argc == 0) {
+ fatalError( "Option requires an argument: No file specified\n");
+ }
+ if (tarName != NULL)
+ fatalError( "Only one 'f' option allowed\n");
+ tarName = *(++argv);
+ if (tarName == NULL)
+ fatalError( "Option requires an argument: No file specified\n");
+ stopIt=TRUE;
+ break;
+
+ case 't':
+ if (extractFlag == TRUE || createFlag == TRUE)
+ goto flagError;
+ listFlag = TRUE;
+ break;
+
+ case 'x':
+ if (listFlag == TRUE || createFlag == TRUE)
+ goto flagError;
+ extractFlag = TRUE;
+ break;
+ case 'c':
+ if (extractFlag == TRUE || listFlag == TRUE)
+ goto flagError;
+ createFlag = TRUE;
+ break;
+
+ case 'v':
+ verboseFlag = TRUE;
+ break;
+
+ case 'O':
+ tostdoutFlag = TRUE;
+ tarName = "-";
+ break;
+ case '-':
+#if defined BB_FEATURE_TAR_EXCLUDE
+ if (strcmp(*argv, "-exclude")==0) {
+ if (--argc == 0) {
+ fatalError( "Option requires an argument: No file specified\n");
+ }
+ excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
+ excludeList[excludeListSize] = *(++argv);
+ /* Remove leading "/"s */
+ if (*excludeList[excludeListSize] =='/') {
+ excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
+ }
+ if (excludeList[excludeListSize++] == NULL)
+ fatalError( "Option requires an argument: No file specified\n");
+ /* Tack a NULL onto the end of the list */
+ excludeList[excludeListSize] = NULL;
+ stopIt=TRUE;
+ break;
+ }
+#endif
+ usage(tar_usage);
+ break;
+
+ default:
+ fatalError( "Unknown tar flag '%c'\n"
+ "Try `tar --help' for more information\n", **argv);
+ }
}
}
#ifndef BB_FEATURE_TAR_CREATE
fatalError( "This version of tar was not compiled with tar creation support.\n");
#else
- exit(writeTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, argc, argv));
+ exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
#endif
} else {
- exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag));
+ exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
}
flagError:
}
static void
+fixUpPermissions(TarInfo *header)
+{
+ struct utimbuf t;
+ /* Now set permissions etc for the new file */
+ chown(header->name, header->uid, header->gid);
+ chmod(header->name, header->mode);
+ /* Reset the time */
+ t.actime = time(0);
+ t.modtime = header->mtime;
+ utime(header->name, &t);
+}
+
+static int
tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
{
size_t writeSize;
if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
/* Tarball seems to have a problem */
errorMsg("tar: Unexpected EOF in archive\n");
- return;
+ return( FALSE);
}
if ( readSize < writeSize )
writeSize = readSize;
if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
/* Output file seems to have a problem */
errorMsg(io_error, header->name, strerror(errno));
- return;
+ return( FALSE);
}
+ } else {
+ actualWriteSz=writeSize;
}
size -= actualWriteSz;
/* Now we are done writing the file out, so try
* and fix up the permissions and whatnot */
if (extractFlag==TRUE && tostdoutFlag==FALSE) {
- struct utimbuf t;
- /* Now set permissions etc for the new file */
- fchown(outFd, header->uid, header->gid);
- fchmod(outFd, header->mode & ~S_IFMT);
close(outFd);
- /* File must be closed before trying to change the date */
- t.actime = time(0);
- t.modtime = header->mtime;
- utime(header->name, &t);
+ fixUpPermissions(header);
}
+ return( TRUE);
}
-static void
-fixUpPermissions(TarInfo *header)
-{
- struct utimbuf t;
- /* Now set permissions etc for the new file */
- chown(header->name, header->uid, header->gid);
- chmod(header->name, header->mode);
- /* Reset the time */
- t.actime = time(0);
- t.modtime = header->mtime;
- utime(header->name, &t);
-}
-
-static void
+static int
tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
+ return( TRUE);
if (createPath(header->name, header->mode) != TRUE) {
- errorMsg("Error creating directory '%s': %s", header->name, strerror(errno));
- return;
+ errorMsg("tar: %s: Cannot mkdir: %s\n",
+ header->name, strerror(errno));
+ return( FALSE);
}
/* make the final component, just in case it was
* omitted by createPath() (which will skip the
if (mkdir(header->name, header->mode) == 0) {
fixUpPermissions(header);
}
+ return( TRUE);
}
-static void
+static int
tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
+ return( TRUE);
if (link(header->linkname, header->name) < 0) {
- errorMsg("Error creating hard link '%s': %s\n", header->linkname, strerror(errno));
- return;
+ errorMsg("tar: %s: Cannot create hard link to '%s': %s\n",
+ header->name, header->linkname, strerror(errno));
+ return( FALSE);
}
/* Now set permissions etc for the new directory */
fixUpPermissions(header);
+ return( TRUE);
}
-static void
+static int
tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
+ return( TRUE);
#ifdef S_ISLNK
if (symlink(header->linkname, header->name) < 0) {
- errorMsg("Error creating symlink '%s': %s\n", header->linkname, strerror(errno));
- return;
+ errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
+ header->name, header->linkname, strerror(errno));
+ return( FALSE);
}
/* Try to change ownership of the symlink.
* If libs doesn't support that, don't bother.
/* Do not change permissions or date on symlink,
* since it changes the pointed to file instead. duh. */
#else
- fprintf(stderr, "Cannot create symbolic links\n");
+ errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
+ header->name, header->linkname,
+ "symlinks not supported");
#endif
+ return( TRUE);
}
-static void
+static int
tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
+ return( TRUE);
if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
- mknod(header->name, header->mode, makedev(header->devmajor, header->devminor));
+ if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
+ errorMsg("tar: %s: Cannot mknod: %s\n",
+ header->name, strerror(errno));
+ return( FALSE);
+ }
} else if (S_ISFIFO(header->mode)) {
- mkfifo(header->name, header->mode);
- } else {
- open(header->name, O_WRONLY | O_CREAT | O_TRUNC, header->mode);
+ if (mkfifo(header->name, header->mode) < 0) {
+ errorMsg("tar: %s: Cannot mkfifo: %s\n",
+ header->name, strerror(errno));
+ return( FALSE);
+ }
}
/* Now set permissions etc for the new directory */
fixUpPermissions(header);
+ return( TRUE);
}
/* Read an octal value in a field of the specified width, with optional
/* Parse the tar header and fill in the nice struct with the details */
static int
-parseTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
+readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
{
int i;
- long chksum, sum;
+ long chksum, sum=0;
unsigned char *s = (unsigned char *)rawHeader;
header->name = rawHeader->name;
+ /* Check for and relativify any absolute paths */
+ if ( *(header->name) == '/' ) {
+ static int alreadyWarned=FALSE;
+
+ while (*(header->name) == '/')
+ ++*(header->name);
+
+ if (alreadyWarned == FALSE) {
+ errorMsg("tar: Removing leading '/' from member names\n");
+ alreadyWarned = TRUE;
+ }
+ }
+
header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
/* Check the checksum */
- sum = ' ' * sizeof(rawHeader->chksum);
- for ( i = TarChecksumOffset; i > 0; i-- )
- sum += *s++;
- s += sizeof(rawHeader->chksum);
- for ( i = (512 - TarChecksumOffset - sizeof(rawHeader->chksum)); i > 0; i-- )
+ for (i = sizeof(*rawHeader); i-- != 0;) {
sum += *s++;
+ }
+ /* Remove the effects of the checksum field (replace
+ * with blanks for the purposes of the checksum) */
+ s = rawHeader->chksum;
+ for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
+ sum -= *s++;
+ }
+ sum += ' ' * sizeof(rawHeader->chksum);
if (sum == chksum )
return ( TRUE);
return( FALSE);
* If the list is empty than all files are extracted or listed.
*/
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag)
+ int tostdoutFlag, int verboseFlag, char** excludeList)
{
- int status, tarFd=0;
+ int status, tarFd=-1;
int errorFlag=FALSE;
TarHeader rawHeader;
TarInfo header;
- int alreadyWarned=FALSE;
- //int skipFileFlag=FALSE;
+#if defined BB_FEATURE_TAR_EXCLUDE
+ char** tmpList;
+#endif
/* Open the tar file for reading. */
if (!strcmp(tarName, "-"))
while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
/* First, try to read the header */
- if ( parseTarHeader(&rawHeader, &header) == FALSE ) {
- close( tarFd);
+ if ( readTarHeader(&rawHeader, &header) == FALSE ) {
if ( *(header.name) == '\0' ) {
goto endgame;
} else {
}
if ( *(header.name) == '\0' )
goto endgame;
-
- /* Check for and relativify any absolute paths */
- if ( *(header.name) == '/' ) {
-
- while (*(header.name) == '/')
- ++*(header.name);
-
- if (alreadyWarned == FALSE) {
- errorMsg("Absolute path detected, removing leading slashes\n");
- alreadyWarned = TRUE;
+ header.tarFd = tarFd;
+
+#if defined BB_FEATURE_TAR_EXCLUDE
+ {
+ int skipFlag=FALSE;
+ /* Check for excluded files.... */
+ for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
+ /* Do some extra hoop jumping for when directory names
+ * end in '/' but the entry in tmpList doesn't */
+ if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
+ header.name[strlen(header.name)-1]=='/'
+ && strncmp( *tmpList, header.name,
+ MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
+ /* If it is a regular file, pretend to extract it with
+ * the extractFlag set to FALSE, so the junk in the tarball
+ * is properly skipped over */
+ if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
+ tarExtractRegularFile(&header, FALSE, FALSE);
+ }
+ skipFlag=TRUE;
+ break;
+ }
}
+ /* There are not the droids you're looking for, move along */
+ if (skipFlag==TRUE)
+ continue;
}
-
+#endif
/* Special treatment if the list (-t) flag is on */
if (verboseFlag == TRUE && extractFlag == FALSE) {
int len, len1;
char buf[35];
struct tm *tm = localtime (&(header.mtime));
- len=printf("%s %d/%-d ", modeString(header.mode), header.uid, header.gid);
+ len=printf("%s ", modeString(header.mode));
+ memset(buf, 0, 8*sizeof(char));
+ my_getpwuid(buf, header.uid);
+ if (! *buf)
+ len+=printf("%d", header.uid);
+ else
+ len+=printf("%s", buf);
+ memset(buf, 0, 8*sizeof(char));
+ my_getgrgid(buf, header.gid);
+ if (! *buf)
+ len+=printf("/%-d ", header.gid);
+ else
+ len+=printf("/%-s ", buf);
+
if (header.type==CHRTYPE || header.type==BLKTYPE) {
len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
header.devmajor, header.devminor);
if (verboseFlag == TRUE || listFlag == TRUE) {
/* Now the normal listing */
printf("%s", header.name);
+ }
+ if (verboseFlag == TRUE && listFlag == TRUE) {
/* If this is a link, say so */
if (header.type==LNKTYPE)
printf(" link to %s", header.linkname);
else if (header.type==SYMTYPE)
printf(" -> %s", header.linkname);
+ }
+ if (verboseFlag == TRUE || listFlag == TRUE) {
printf("\n");
}
-#if 0
- /* See if we want to restore this file or not */
- skipFileFlag=FALSE;
- if (wantFileName(outName) == FALSE) {
- skipFileFlag = TRUE;
- }
-#endif
+ /* Remove any clutter lying in our way */
+ unlink( header.name);
/* If we got here, we can be certain we have a legitimate
* header to work with. So work with it. */
/* If the name ends in a '/' then assume it is
* supposed to be a directory, and fall through */
if (header.name[strlen(header.name)-1] != '/') {
- tarExtractRegularFile(&header, extractFlag, tostdoutFlag);
+ if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
+ errorFlag=TRUE;
break;
}
case DIRTYPE:
- tarExtractDirectory( &header, extractFlag, tostdoutFlag);
+ if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
+ errorFlag=TRUE;
break;
case LNKTYPE:
- tarExtractHardLink( &header, extractFlag, tostdoutFlag);
+ if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
+ errorFlag=TRUE;
break;
case SYMTYPE:
- tarExtractSymLink( &header, extractFlag, tostdoutFlag);
+ if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
+ errorFlag=TRUE;
break;
case CHRTYPE:
case BLKTYPE:
case FIFOTYPE:
- tarExtractSpecial( &header, extractFlag, tostdoutFlag);
+ if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
+ errorFlag=TRUE;
break;
default:
close( tarFd);
errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
return ( FALSE);
}
- else
+ else if (errorFlag==TRUE) {
+ errorMsg( "tar: Error exit delayed from previous errors\n");
+ return( FALSE);
+ } else
return( status);
/* Stuff to do when we are done */
endgame:
close( tarFd);
if ( *(header.name) == '\0' ) {
- if (errorFlag==FALSE)
+ if (errorFlag==TRUE)
+ errorMsg( "tar: Error exit delayed from previous errors\n");
+ else
return( TRUE);
}
return( FALSE);
#ifdef BB_FEATURE_TAR_CREATE
+/* Some info to be carried along when creating a new tarball */
+struct TarBallInfo
+{
+ char* fileName; /* File name of the tarball */
+ int tarFd; /* Open-for-write file descriptor
+ for the tarball */
+ struct stat statBuf; /* Stat info for the tarball, letting
+ us know the inode and device that the
+ tarball lives, so we can avoid trying
+ to include the tarball into itself */
+ int verboseFlag; /* Whether to print extra stuff or not */
+ char** excludeList; /* List of files to not include */
+};
+typedef struct TarBallInfo TarBallInfo;
+
+
/* Put an octal string into the specified buffer.
* The number is zero and space padded and possibly null padded.
* Returns TRUE if successful. */
static int putOctal (char *cp, int len, long value)
{
int tempLength;
- char *tempString;
char tempBuffer[32];
+ char *tempString = tempBuffer;
/* Create a string of the specified length with an initial space,
* leading zeroes and the octal number, and a trailing null. */
- tempString = tempBuffer;
-
- sprintf (tempString, " %0*lo", len - 2, value);
-
- tempLength = strlen (tempString) + 1;
+ sprintf (tempString, "%0*lo", len - 1, value);
/* If the string is too large, suppress the leading space. */
+ tempLength = strlen (tempString) + 1;
if (tempLength > len) {
tempLength--;
tempString++;
return TRUE;
}
-static int fileAction(const char *fileName, struct stat *statbuf)
+/* Write out a tar header for the specified file/directory/whatever */
+static int
+writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
{
- fprintf(stdout, "%s\n", fileName);
- return (TRUE);
+ long chksum=0;
+ struct TarHeader header;
+#if defined BB_FEATURE_TAR_EXCLUDE
+ char** tmpList;
+#endif
+ const unsigned char *cp = (const unsigned char *) &header;
+ ssize_t size = sizeof(struct TarHeader);
+
+ memset( &header, 0, size);
+
+ if (*fileName=='/') {
+ static int alreadyWarned=FALSE;
+ if (alreadyWarned==FALSE) {
+ errorMsg("tar: Removing leading '/' from member names\n");
+ alreadyWarned=TRUE;
+ }
+ strncpy(header.name, fileName+1, sizeof(header.name));
+ }
+ else {
+ strncpy(header.name, fileName, sizeof(header.name));
+ }
+
+#if defined BB_FEATURE_TAR_EXCLUDE
+ /* Check for excluded files.... */
+ for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
+ /* Do some extra hoop jumping for when directory names
+ * end in '/' but the entry in tmpList doesn't */
+ if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
+ header.name[strlen(header.name)-1]=='/'
+ && strncmp( *tmpList, header.name,
+ MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
+ /* Set the mode to something that is not a regular file, thereby
+ * faking out writeTarFile into thinking that nothing further need
+ * be done for this file. Yes, I know this is ugly, but it works. */
+ statbuf->st_mode = 0;
+ return( TRUE);
+ }
+ }
+#endif
+
+ putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
+ putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
+ putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
+ putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
+ putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
+ strncpy(header.magic, TAR_MAGIC TAR_VERSION,
+ TAR_MAGIC_LEN + TAR_VERSION_LEN );
+
+ /* Enter the user and group names (default to root if it fails) */
+ my_getpwuid(header.uname, statbuf->st_uid);
+ if (! *header.uname)
+ strcpy(header.uname, "root");
+ my_getgrgid(header.gname, statbuf->st_gid);
+ if (! *header.uname)
+ strcpy(header.uname, "root");
+
+ /* WARNING/NOTICE: I break Hard Links */
+ if (S_ISLNK(statbuf->st_mode)) {
+ char buffer[BUFSIZ];
+ header.typeflag = SYMTYPE;
+ if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) {
+ errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
+ return ( FALSE);
+ }
+ strncpy(header.linkname, buffer, sizeof(header.linkname));
+ } else if (S_ISDIR(statbuf->st_mode)) {
+ header.typeflag = DIRTYPE;
+ strncat(header.name, "/", sizeof(header.name));
+ } else if (S_ISCHR(statbuf->st_mode)) {
+ header.typeflag = CHRTYPE;
+ putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
+ putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
+ } else if (S_ISBLK(statbuf->st_mode)) {
+ header.typeflag = BLKTYPE;
+ putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
+ putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
+ } else if (S_ISFIFO(statbuf->st_mode)) {
+ header.typeflag = FIFOTYPE;
+ } else if (S_ISREG(statbuf->st_mode)) {
+ header.typeflag = REGTYPE;
+ putOctal(header.size, sizeof(header.size), statbuf->st_size);
+ } else {
+ errorMsg("tar: %s: Unknown file type\n", fileName);
+ return ( FALSE);
+ }
+
+ /* Calculate and store the checksum (i.e. the sum of all of the bytes of
+ * the header). The checksum field must be filled with blanks for the
+ * calculation. The checksum field is formatted differently from the
+ * other fields: it has [6] digits, a null, then a space -- rather than
+ * digits, followed by a null like the other fields... */
+ memset(header.chksum, ' ', sizeof(header.chksum));
+ cp = (const unsigned char *) &header;
+ while (size-- > 0)
+ chksum += *cp++;
+ putOctal(header.chksum, 7, chksum);
+
+ /* Now write the header out to disk */
+ if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
+ errorMsg(io_error, fileName, strerror(errno));
+ return ( FALSE);
+ }
+ /* Pad the header up to the tar block size */
+ for (; size<TAR_BLOCK_SIZE; size++) {
+ write(tbInfo->tarFd, "\0", 1);
+ }
+ /* Now do the verbose thing (or not) */
+ if (tbInfo->verboseFlag==TRUE)
+ fprintf(stdout, "%s\n", header.name);
+
+ return ( TRUE);
+}
+
+
+static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
+{
+ struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
+
+ /* It is against the rules to archive a socket */
+ if (S_ISSOCK(statbuf->st_mode)) {
+ errorMsg("tar: %s: socket ignored\n", fileName);
+ return( TRUE);
+ }
+
+ /* It is a bad idea to store the archive we are in the process of creating,
+ * so check the device and inode to be sure that this particular file isn't
+ * the new tarball */
+ if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
+ tbInfo->statBuf.st_ino == statbuf->st_ino) {
+ errorMsg("tar: %s: file is the archive; skipping\n", fileName);
+ return( TRUE);
+ }
+
+ if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
+ return( FALSE);
+ }
+
+ /* Now, if the file is a regular file, copy it out to the tarball */
+ if (S_ISREG(statbuf->st_mode)) {
+ int inputFileFd;
+ char buffer[BUFSIZ];
+ ssize_t size=0, readSize=0;
+
+ /* open the file we want to archive, and make sure all is well */
+ if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
+ errorMsg("tar: %s: Cannot open: %s\n", fileName, strerror(errno));
+ return( FALSE);
+ }
+
+ /* write the file to the archive */
+ while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
+ if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
+ /* Output file seems to have a problem */
+ errorMsg(io_error, fileName, strerror(errno));
+ return( FALSE);
+ }
+ readSize+=size;
+ }
+ if (size == -1) {
+ errorMsg(io_error, fileName, strerror(errno));
+ return( FALSE);
+ }
+ /* Pad the file up to the tar block size */
+ for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
+ write(tbInfo->tarFd, "\0", 1);
+ }
+ close( inputFileFd);
+ }
+
+ return( TRUE);
}
-static int writeTarFile(const char* tarName, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, int argc, char **argv)
+static int writeTarFile(const char* tarName, int tostdoutFlag,
+ int verboseFlag, int argc, char **argv, char** excludeList)
{
- int tarFd=0;
- //int errorFlag=FALSE;
- //TarHeader rawHeader;
- //TarInfo header;
- //int alreadyWarned=FALSE;
- char *directory = ".";
- //int skipFileFlag=FALSE;
+ int tarFd=-1;
+ int errorFlag=FALSE;
+ ssize_t size;
+ struct TarBallInfo tbInfo;
+ tbInfo.verboseFlag = verboseFlag;
+
+ /* Make sure there is at least one file to tar up. */
+ if (argc <= 0)
+ fatalError("tar: Cowardly refusing to create an empty archive\n");
/* Open the tar file for writing. */
- if (!strcmp(tarName, "-"))
- tarFd = fileno(stdout);
+ if (tostdoutFlag == TRUE)
+ tbInfo.tarFd = fileno(stdout);
else
- tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
- if (tarFd < 0) {
- errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
+ tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+ if (tbInfo.tarFd < 0) {
+ errorMsg( "tar: Error opening '%s': %s\n", tarName, strerror(errno));
return ( FALSE);
}
+ tbInfo.excludeList=excludeList;
+ /* Store the stat info for the tarball's file, so
+ * can avoid including the tarball into itself.... */
+ if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
+ fatalError(io_error, tarName, strerror(errno));
/* Set the umask for this process so it doesn't
* screw up permission setting for us later. */
umask(0);
/* Read the directory/files and iterate over them one at a time */
- if (recursiveAction(directory, TRUE, FALSE, FALSE,
- fileAction, fileAction) == FALSE) {
- exit(FALSE);
+ while (argc-- > 0) {
+ if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
+ writeFileToTarball, writeFileToTarball,
+ (void*) &tbInfo) == FALSE) {
+ errorFlag = TRUE;
+ }
+ }
+ /* Write two empty blocks to the end of the archive */
+ for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
+ write(tbInfo.tarFd, "\0", 1);
}
+ /* To be pedantically correct, we would check if the tarball
+ * is smaller then 20 tar blocks, and pad it if it was smaller,
+ * but that isn't necessary for GNU tar interoperability, and
+ * so is considered a waste of space */
- // TODO: DO STUFF HERE
+ /* Hang up the tools, close up shop, head home */
close(tarFd);
+ if (errorFlag == TRUE) {
+ errorMsg("tar: Error exit delayed from previous errors\n");
+ return(FALSE);
+ }
return( TRUE);
}
projects / oweals / busybox.git / blobdiff