prow/cmd/tackle/main.go
func output(args ...string) (string, error) {
	cmd := exec.Command(args[0], args[1:]...)
	cmd.Stderr = os.Stderr
	cmd.Stdin = os.Stdin
	b, err := cmd.Output()
	return strings.TrimSpace(string(b)), err
}
func output(args ...string) (string, error) {
	cmd := exec.Command(args[0], args[1:]...)
	cmd.Stderr = os.Stderr
	cmd.Stdin = os.Stdin
	b, err := cmd.Output()
	return strings.TrimSpace(string(b)), err
}
// output returns the trimmed output of running args, or an err on non-zero exit.