func (br *byteReader) Read(p []byte) (n int, err error) {
	if br.done {
		return 0, io.EOF
	}
	if len(p) == 0 {
		return 0, nil
	}
	br.done = true
	p[0] = br.b
	return 1, io.EOF
}

// transferWriter inspects the fields of a user-supplied Request or Response,
// sanitizes them without changing the user object and provides methods for
// writing the respective header, body and trailer in wire format.
type transferWriter struct {

	check          func(match map[string]string) error // additional checks
	schemelessRepo bool                                // if true, the repo pattern lacks a scheme
}

// FromDir inspects dir and its parents to determine the
// version control system and code repository to use.
// If no repository is found, FromDir returns an error
// equivalent to os.ErrNotExist.