/*
* 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) 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
#include <utime.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
-#include <sys/param.h> /* for PATH_MAX */
-#ifdef BB_FEATURE_TAR_CREATE
-
static const char tar_usage[] =
- "tar -[cxtvOf] [tarFile] [-X excludeFile] [FILE] ...\n\n"
- "Create, extract, or list files from a tar file. Note that\n"
- "this version of tar packs hard links as separate files.\n\n"
- "Options:\n"
-
- "\tc=create, x=extract, t=list contents, v=verbose,\n"
- "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n"
- "\tX=exclude file\n";
-
+#ifdef BB_FEATURE_TAR_CREATE
+ "tar -[cxtvO] "
#else
-
-static const char tar_usage[] =
- "tar -[xtvO] [-f tarFile] [-X excludeFile] [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"
- "\tX=exclude file\n";
-
-
+ "tar -[xtvO] "
#endif
-
+#if defined BB_FEATURE_TAR_EXCLUDE
+ "[--exclude File] "
+#endif
+ "[-f tarFile] [FILE] ...\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+ "\nCreate, 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"
+ "\nFile 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
+ "\nInformative output:\n"
+ "\tv\t\tverbosely list files processed\n"
+#endif
+ ;
/* 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 old GNU format */
+#define TAR_VERSION " " /* Be compatable with GNU tar format */
#define TAR_MAGIC_LEN 6
#define TAR_VERSION_LEN 2
#define TAR_BLOCK_SIZE 512
extern int tar_main(int argc, char **argv)
{
char** excludeList=NULL;
+#if defined BB_FEATURE_TAR_EXCLUDE
int excludeListSize=0;
- const char *tarName=NULL;
+#endif
+ const char *tarName="-";
int listFlag = FALSE;
int extractFlag = FALSE;
int createFlag = FALSE;
usage(tar_usage);
/* Parse any options */
- while (--argc > 0 && **(++argv) == '-') {
+ while (--argc > 0 && strspn(*(++argv), "-cxt") >0 ) {
stopIt=FALSE;
- while (stopIt==FALSE && *(++(*argv))) {
+ while (stopIt==FALSE && *argv && **argv) {
switch (**argv) {
case 'f':
if (--argc == 0) {
fatalError( "Option requires an argument: No file specified\n");
}
- if (tarName != NULL)
+ if (*tarName != '-')
fatalError( "Only one 'f' option allowed\n");
tarName = *(++argv);
if (tarName == NULL)
fatalError( "Option requires an argument: No file specified\n");
+ if (!strcmp(tarName, "-"))
+ tostdoutFlag = TRUE;
stopIt=TRUE;
break;
tostdoutFlag = TRUE;
tarName = "-";
break;
- case 'X':
- if (--argc == 0) {
- fatalError( "Option requires an argument: No file specified\n");
+ 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;
}
- excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+1));
- excludeList[excludeListSize] = *(++argv);
- /* Remove leading "/"s */
- if (*excludeList[excludeListSize] =='/') {
- excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
+#endif
+ if (strcmp(*argv, "-help")==0) {
+ usage(tar_usage);
}
- if (excludeList[excludeListSize++] == NULL)
- fatalError( "Option requires an argument: No file specified\n");
- stopIt=TRUE;
- break;
-
- case '-':
- usage(tar_usage);
break;
default:
fatalError( "Unknown tar flag '%c'\n"
"Try `tar --help' for more information\n", **argv);
}
+ ++(*argv);
}
}
-#if 0
- for (i=0; i<excludeListSize; i++) {
- printf( "%s\n", excludeList[i]);
- fflush(stdout);
- }
-#endif
-
/*
* Do the correct type of action supplying the rest of the
#else
exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
#endif
- } else {
+ }
+ if (listFlag == TRUE || extractFlag == TRUE) {
exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
}
/* Open the file to be written, if a file is supposed to be written */
if (extractFlag==TRUE && tostdoutFlag==FALSE) {
- if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0)
- errorMsg(io_error, header->name, strerror(errno));
/* Create the path to the file, just in case it isn't there...
* This should not screw up path permissions or anything. */
createPath(header->name, 0777);
+ if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
+ header->mode & ~S_IFMT)) < 0) {
+ errorMsg(io_error, header->name, strerror(errno));
+ return( FALSE);
+ }
}
/* Write out the file, if we are supposed to be doing that */
}
if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
/* Tarball seems to have a problem */
- errorMsg("tar: Unexpected EOF in archive\n");
+ errorMsg("Unexpected EOF in archive\n");
return( FALSE);
}
if ( readSize < writeSize )
errorMsg(io_error, header->name, strerror(errno));
return( FALSE);
}
+ } else {
+ actualWriteSz=writeSize;
}
size -= actualWriteSz;
return( TRUE);
if (createPath(header->name, header->mode) != TRUE) {
- errorMsg("tar: %s: Cannot mkdir: %s\n",
+ errorMsg("%s: Cannot mkdir: %s\n",
header->name, strerror(errno));
return( FALSE);
}
return( TRUE);
if (link(header->linkname, header->name) < 0) {
- errorMsg("tar: %s: Cannot create hard link to '%s': %s\n",
+ errorMsg("%s: Cannot create hard link to '%s': %s\n",
header->name, header->linkname, strerror(errno));
return( FALSE);
}
#ifdef S_ISLNK
if (symlink(header->linkname, header->name) < 0) {
- errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
+ errorMsg("%s: Cannot create symlink to '%s': %s\n",
header->name, header->linkname, strerror(errno));
return( FALSE);
}
/* Do not change permissions or date on symlink,
* since it changes the pointed to file instead. duh. */
#else
- errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
+ errorMsg("%s: Cannot create symlink to '%s': %s\n",
header->name, header->linkname,
"symlinks not supported");
#endif
if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
- errorMsg("tar: %s: Cannot mknod: %s\n",
+ errorMsg("%s: Cannot mknod: %s\n",
header->name, strerror(errno));
return( FALSE);
}
} else if (S_ISFIFO(header->mode)) {
if (mkfifo(header->name, header->mode) < 0) {
- errorMsg("tar: %s: Cannot mkfifo: %s\n",
+ errorMsg("%s: Cannot mkfifo: %s\n",
header->name, strerror(errno));
return( FALSE);
}
++*(header->name);
if (alreadyWarned == FALSE) {
- errorMsg("tar: Removing leading '/' from member names\n");
+ errorMsg("Removing leading '/' from member names\n");
alreadyWarned = TRUE;
}
}
chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
header->type = rawHeader->typeflag;
header->linkname = rawHeader->linkname;
- /* Check for and relativify any absolute paths */
- if ( *(header->linkname) == '/' ) {
- static int alreadyWarned=FALSE;
-
- while (*(header->linkname) == '/')
- ++*(header->linkname);
-
- if (alreadyWarned == FALSE) {
- errorMsg("tar: Removing leading '/' from link names\n");
- alreadyWarned = TRUE;
- }
- }
header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
int tostdoutFlag, int verboseFlag, char** excludeList)
{
- int status, tarFd=0;
+ int status, tarFd=-1;
int errorFlag=FALSE;
TarHeader rawHeader;
TarInfo header;
- //int skipFileFlag=FALSE;
+#if defined BB_FEATURE_TAR_EXCLUDE
+ char** tmpList;
+#endif
/* Open the tar file for reading. */
if (!strcmp(tarName, "-"))
/* First, try to read the header */
if ( readTarHeader(&rawHeader, &header) == FALSE ) {
- close( tarFd);
if ( *(header.name) == '\0' ) {
goto endgame;
} else {
}
if ( *(header.name) == '\0' )
goto endgame;
-
+ 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;
len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
header.devmajor, header.devminor);
} else {
- len1=snprintf(buf, sizeof(buf), "%d ", header.size);
+ len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
}
/* Jump through some hoops to make the columns match up */
for(;(len+len1)<31;len++)
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 (extractFlag == TRUE) /* .. but only if we are extracting (as */
+ unlink( header.name); /* opposed to listing) (rob@sysgo.de) */
/* If we got here, we can be certain we have a legitimate
* header to work with. So work with it. */
return ( FALSE);
}
else if (errorFlag==TRUE) {
- errorMsg( "tar: Error exit delayed from previous errors\n");
+ errorMsg( "Error exit delayed from previous errors\n");
return( FALSE);
} else
return( status);
close( tarFd);
if ( *(header.name) == '\0' ) {
if (errorFlag==TRUE)
- errorMsg( "tar: Error exit delayed from previous errors\n");
+ errorMsg( "Error exit delayed from previous errors\n");
else
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);
if (*fileName=='/') {
static int alreadyWarned=FALSE;
if (alreadyWarned==FALSE) {
- errorMsg("tar: Removing leading '/' from member names\n");
+ errorMsg("Removing leading '/' from member names\n");
alreadyWarned=TRUE;
}
strncpy(header.name, fileName+1, sizeof(header.name));
strncpy(header.name, fileName, sizeof(header.name));
}
- /* Now that leading '/''s have been removed,
- * check for excluded files.... */
+#if defined BB_FEATURE_TAR_EXCLUDE
+ /* Check for excluded files.... */
for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
- printf( "comparing '%s' and '%s'", *tmpList, header.name);
- if (strcmp( *tmpList, header.name)==0)
- printf( ": match\n");
- else
- printf( "\n");
+ /* 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);
if (! *header.uname)
strcpy(header.uname, "root");
- // FIXME (or most likely not): I break Hard Links
+ /* WARNING/NOTICE: I break Hard Links */
if (S_ISLNK(statbuf->st_mode)) {
+ int link_size=0;
char buffer[BUFSIZ];
header.typeflag = SYMTYPE;
- if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) {
+ link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
+ if ( link_size < 0) {
errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
return ( FALSE);
}
- if (*buffer=='/') {
- static int alreadyWarned=FALSE;
- if (alreadyWarned==FALSE) {
- errorMsg("tar: Removing leading '/' from link names\n");
- alreadyWarned=TRUE;
- }
- strncpy(header.linkname, buffer+1, sizeof(header.linkname));
- }
- else {
- strncpy(header.linkname, buffer, sizeof(header.linkname));
- }
+ buffer[link_size] = '\0';
+ strncpy(header.linkname, buffer, sizeof(header.linkname));
} else if (S_ISDIR(statbuf->st_mode)) {
header.typeflag = DIRTYPE;
strncat(header.name, "/", sizeof(header.name));
header.typeflag = REGTYPE;
putOctal(header.size, sizeof(header.size), statbuf->st_size);
} else {
- errorMsg("tar: %s: Unknown file type\n", fileName);
+ errorMsg("%s: Unknown file type\n", fileName);
return ( FALSE);
}
/* It is against the rules to archive a socket */
if (S_ISSOCK(statbuf->st_mode)) {
- errorMsg("tar: %s: socket ignored\n", fileName);
+ errorMsg("%s: socket ignored\n", fileName);
return( TRUE);
}
* 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);
+ errorMsg("%s: file is the archive; skipping\n", fileName);
return( TRUE);
}
/* 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));
+ errorMsg("%s: Cannot open: %s\n", fileName, strerror(errno));
return( FALSE);
}
/* Make sure there is at least one file to tar up. */
if (argc <= 0)
- fatalError("tar: Cowardly refusing to create an empty archive\n");
+ fatalError("Cowardly refusing to create an empty archive\n");
/* Open the tar file for writing. */
if (tostdoutFlag == TRUE)
else
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));
+ errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
return ( FALSE);
}
tbInfo.excludeList=excludeList;
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 */
+
/* Hang up the tools, close up shop, head home */
close(tarFd);
if (errorFlag == TRUE) {
- errorMsg("tar: Error exit delayed from previous errors\n");
+ errorMsg("Error exit delayed from previous errors\n");
return(FALSE);
}
return( TRUE);
projects / oweals / busybox.git / blobdiff