SelfUpdateCommand.php

<?php
/**
 * @file
 * Contains \Drupal\AppConsole\Command\SelfUpdateCommand.
 */

namespace Drupal\AppConsole\Command;

use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Herrera\Phar\Update\Manager;
use Herrera\Phar\Update\Manifest;

class SelfUpdateCommand extends ContainerAwareCommand
{
    const DRUPAL_CONSOLE_MANIFEST = "http://drupalconsole.com/manifest.json";

    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
          ->setName('self-update')
          ->setDescription($this->trans('commands.self-update.description'))
          ->setHelp($this->trans('commands.self-update.help'));
    }

    /**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $manager = new Manager(Manifest::loadFile(
          self::DRUPAL_CONSOLE_MANIFEST
        ));
        $manager->update($this->getApplication()->getVersion(), true);
        $output->writeln($this->trans('commands.self-update.messages.success'));
    }
}