public function execute(InputInterface $input, OutputInterface $output)
{
$key = $input->getArgument('key');
$output->write("Hiera-PHP: looking up key `{$key}`\n");
$scope = new Scope();
$scope->setVariable('::environment', 'production');
$scope->setVariable('::clientcert', 'web01.dc1.example.webx');
$scope->setVariable('::country', 'nl');
$hiera = new Hiera();
$loader = new YamlConfigLoader();
$loader->load($hiera, __DIR__ . '/../../examples/hiera.yaml');
$answer = $hiera->lookup($key, '#default#', $scope);
$output->write("Answer: `{$answer}`\n");
}
