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Support for tar -z option for uncompressing only

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This commit is contained in:
Glenn L McGrath
2000-12-10 01:57:30 +00:00
parent 00732b57c7
commit 46f44d24fc
6 changed files with 163 additions and 48 deletions
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96
tar.c
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@@ -52,6 +52,11 @@
#include <sys/sysmacros.h>
#include <getopt.h>
#ifdef BB_FEATURE_TAR_GZIP
extern int unzip(int in, int out);
extern int gunzip_init();
#endif
/* Tar file constants */
#ifndef MAJOR
#define MAJOR(dev) (((dev)>>8)&0xff)
@@ -129,29 +134,64 @@ struct TarInfo
typedef struct TarInfo TarInfo;
/* Local procedures to restore files from a tar file. */
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
static int readTarFile(int tarFd, int extractFlag, int listFlag,
int tostdoutFlag, int verboseFlag, char** extractList,
char** excludeList);
#ifdef BB_FEATURE_TAR_CREATE
/* Local procedures to save files into a tar file. */
static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
char** excludeList);
#endif
#ifdef BB_FEATURE_TAR_GZIP
/* Signal handler for when child gzip process dies... */
void child_died()
{
fflush(stdout);
fflush(stderr);
exit(EXIT_FAILURE);
}
static int tar_unzip_init(int tarFd)
{
int child_pid;
static int unzip_pipe[2];
/* Cope if child dies... Otherwise we block forever in read()... */
signal(SIGCHLD, child_died);
if (pipe(unzip_pipe)!=0)
error_msg_and_die("pipe error\n");
if ( (child_pid = fork()) == -1)
error_msg_and_die("fork failure\n");
if (child_pid==0) {
/* child process */
gunzip_init();
unzip(tarFd, unzip_pipe[1]);
exit(EXIT_SUCCESS);
}
else
/* return fd of uncompressed data to parent process */
return(unzip_pipe[0]);
}
#endif
extern int tar_main(int argc, char **argv)
{
char** excludeList=NULL;
char** extractList=NULL;
const char *tarName="-";
#if defined BB_FEATURE_TAR_EXCLUDE
int excludeListSize=0;
char *excludeFileName ="-";
FILE *fileList;
char file[256];
char *excludeFileName ="-";
FILE *fileList;
char file[256];
#endif
#if defined BB_FEATURE_TAR_GZIP
int unzipFlag = FALSE;
#endif
const char *tarName="-";
int listFlag = FALSE;
int extractFlag = FALSE;
int createFlag = FALSE;
@@ -160,7 +200,6 @@ extern int tar_main(int argc, char **argv)
int status = FALSE;
int firstOpt = TRUE;
int stopIt;
if (argc <= 1)
usage(tar_usage);
@@ -185,6 +224,11 @@ extern int tar_main(int argc, char **argv)
goto flagError;
listFlag = TRUE;
break;
#ifdef BB_FEATURE_TAR_GZIP
case 'z':
unzipFlag = TRUE;
break;
#endif
case 'v':
verboseFlag = TRUE;
break;
@@ -255,13 +299,31 @@ extern int tar_main(int argc, char **argv)
#ifndef BB_FEATURE_TAR_CREATE
error_msg_and_die( "This version of tar was not compiled with tar creation support.\n");
#else
#ifdef BB_FEATURE_TAR_GZIP
if (unzipFlag==TRUE)
error_msg_and_die("Creation of compressed not internally support by tar, pipe to busybox gunzip\n");
#endif
status = writeTarFile(tarName, verboseFlag, argv, excludeList);
#endif
}
if (listFlag == TRUE || extractFlag == TRUE) {
int tarFd;
if (*argv)
extractList = argv;
status = readTarFile(tarName, extractFlag, listFlag, tostdoutFlag,
/* Open the tar file for reading. */
if (!strcmp(tarName, "-"))
tarFd = fileno(stdin);
else
tarFd = open(tarName, O_RDONLY);
if (tarFd < 0)
error_msg_and_die( "Error opening '%s': %s\n", tarName, strerror(errno));
#ifdef BB_FEATURE_TAR_GZIP
/* unzip tarFd in a seperate process */
if (unzipFlag == TRUE)
tarFd = tar_unzip_init(tarFd);
#endif
status = readTarFile(tarFd, extractFlag, listFlag, tostdoutFlag,
verboseFlag, extractList, excludeList);
}
@@ -521,27 +583,17 @@ readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
* Read a tar file and extract or list the specified files within it.
* If the list is empty than all files are extracted or listed.
*/
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
extern int readTarFile(int tarFd, int extractFlag, int listFlag,
int tostdoutFlag, int verboseFlag, char** extractList,
char** excludeList)
{
int status, tarFd=-1;
int status;
int errorFlag=FALSE;
int skipNextHeaderFlag=FALSE;
TarHeader rawHeader;
TarInfo header;
char** tmpList;
/* Open the tar file for reading. */
if (!strcmp(tarName, "-"))
tarFd = fileno(stdin);
else
tarFd = open(tarName, O_RDONLY);
if (tarFd < 0) {
error_msg( "Error opening '%s': %s\n", tarName, strerror(errno));
return ( FALSE);
}
/* Set the umask for this process so it doesn't
* screw up permission setting for us later. */
umask(0);
@@ -739,7 +791,7 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag,
close(tarFd);
if (status > 0) {
/* Bummer - we read a partial header */
error_msg( "Error reading '%s': %s\n", tarName, strerror(errno));
error_msg( "Error reading tar file: %s\n", strerror(errno));
return ( FALSE);
}
else if (errorFlag==TRUE) {