func copyFile(tw *tar.Writer, dst, src string) error {
	s, err := os.Open(src)
	if err != nil {
		return fmt.Errorf("unable to open %v: %v", src, err)
	}
	defer s.Close()
	fi, err := s.Stat()
	if err != nil {
		return fmt.Errorf("unable to stat %v: %v", src, err)
	}

	hdr, err := tar.FileInfoHeader(fi, dst)
	if err != nil {
		return fmt.Errorf("unable to create tar header for %v: %v", dst, err)
	}
	hdr.Name = dst
	if err := tw.WriteHeader(hdr); err != nil {
		return fmt.Errorf("unable to write header for %v: %v", dst, err)
	}
	_, err = io.Copy(tw, s)
	if err != nil {
		return fmt.Errorf("unable to copy %v to %v: %v", src, dst, err)
	}
	return nil
}
func copyFile(tw *tar.Writer, dst, src string) error {
	s, err := os.Open(src)
	if err != nil {
		return fmt.Errorf("unable to open %v: %v", src, err)
	}
	defer s.Close()
	fi, err := s.Stat()
	if err != nil {
		return fmt.Errorf("unable to stat %v: %v", src, err)
	}

	hdr, err := tar.FileInfoHeader(fi, dst)
	if err != nil {
		return fmt.Errorf("unable to create tar header for %v: %v", dst, err)
	}
	hdr.Name = dst
	if err := tw.WriteHeader(hdr); err != nil {
		return fmt.Errorf("unable to write header for %v: %v", dst, err)
	}
	_, err = io.Copy(tw, s)
	if err != nil {
		return fmt.Errorf("unable to copy %v to %v: %v", src, dst, err)
	}
	return nil
}
func copyFile ( tw * tar . Writer , dst , src string ) error { s , err := os . Open ( src ) if err != nil { return fmt . Errorf ( " " , src , err ) } defer s . Close ( ) fi , err := s . Stat ( ) if err != nil { return fmt . Errorf ( " " , src , err ) } hdr , err := tar . FileInfoHeader ( fi , dst ) if err != nil { return fmt . Errorf ( " " , dst , err ) } hdr . Name = dst if err := tw . WriteHeader ( hdr ) ; err != nil { return fmt . Errorf ( " " , dst , err ) } _ , err = io . Copy ( tw , s ) if err != nil { return fmt . Errorf ( " " , src , dst , err ) } return nil }
// copyFile copies src to tar file dst.
copyFile copies src to tar file dst .