int returnCode = process.waitFor()
        String stdout = stdoutFuture.get()
        String stderr = stderrFuture.get()
        return new ExecResult(stderr: stderr, stdout: stdout, returnCode: returnCode)
    }

    static String getStdout(String command) {
        ExecResult execResult = exec(command)

        assert execResult.returnCode == 0: "$command failed with return code: $execResult"

        private final int code;
        private final String stdout;
        private final String stderr;

        public ExecResult(String[] args, int code, String stdout, String stderr) {
            this.args = args;
            this.code = code;
            this.stdout = stdout;
            this.stderr = stderr;
        }

        @Override
        public String toString() {