diff options
Diffstat (limited to 'tar.c')
| -rw-r--r-- | tar.c | 96 |
1 files changed, 74 insertions, 22 deletions
@@ -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) { |