lib/magento/Archive/Tar.php
protected function _initWriter()
    {
        $this->_writer = new Mage_Archive_Helper_File($this->_destinationFilePath);
        $this->_writer->open('w');

        return $this;
    }
protected function _initWriter()
    {
        $this->_writer = new Mage_Archive_Helper_File($this->_destinationFilePath);
        $this->_writer->open('w');

        return $this;
    }
protected function _initWriter ( ) { $ this -> _writer = new Mage_Archive_Helper_File ( $ this -> _destinationFilePath ) ; $ this -> _writer -> open ( 'w' ) ; return $ this ; }
Initialize tarball writer

@return Mage_Archive_Tar
Initialize tarball writer