How to disable output for a command in Symfony Console?

Question

I writing a module, actually a custom command in Magento 2. Magento 2 console application is proudly powered by Symfony Console, obviously. And my concernation is how to disable output from $output for specified command?

For example:

$setupUpgradeCommand = $this->getApplication()->find('setup:upgrade');

$setupUpgradeArguments = array(
    'command' => 'setup:upgrade',
    '--quiet' => true,
);

$setupUpgradeInput = new ArrayInput($setupUpgradeArguments);

$start = microtime(true);
$output->writeln('<info>Start upgrading module schemas...</info>');
$setupUpgradeCommand->run($setupUpgradeInput, $output);
$output->writeln('...............................<info>OK</info>');

// My long logic-code start from here....

Unfortunately, even I set --quiet to true, output of this command setup:upgrade still there.

Any ideas?

Answer 1

As answered in a comment.. although almost exactly the same as the answer by @toooni.

You can insert the NullOutput rather than inserting the actual output object supplied by the command.

use Symfony\Component\Console\Output\NullOutput;

$setupUpgradeCommand->run($setupUpgradeInput, new NullOutput());