def run(self):
        # Thanks to the question and answers:
        # http://stackoverflow.com/questions/4417546/constantly-print-subprocess-output-while-process-is-running
        def execute(cmd):
            process = subprocess.Popen(cmd)
            bar()
            stdout_lines = iter(process.stdout.readline, "")
            for stdout_line in stdout_lines:
                yield stdout_line

            process.stdout.close()
            return_code = process.wait()
            if return_code != 0:
                raise subprocess.CalledProcessError(return_code, cmd)