Updater.php

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<?php
namespace Magento\Setup\Model;

use Magento\Framework\Filesystem;
use Magento\Setup\Model\Cron\Queue;

class Updater
{
    const TASK_TYPE_UPDATE = 'update';
    const TASK_TYPE_UNINSTALL = 'uninstall';
    const TASK_TYPE_MAINTENANCE_MODE = 'maintenance_mode';
    private $queue;

    public function __construct(Queue $queue)
    {
        $this->queue = $queue;
    }

    public function createUpdaterTask(array $packages, $type, array $additionalOptions = [])
    {
        try {
            // write to .update_queue.json file
            $params = [];
            if (!empty($packages)) {
                $params['components'] = $packages;
            }
            foreach ($additionalOptions as $key => $value) {
                $params[$key] = $value;
            }

            $this->queue->addJobs([['name' => $type, 'params' => $params]]);
            return '';
        } catch (\Exception $e) {
            return $e->getMessage();
        }
    }
}