ConfigChangeDetector.php

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<?php
namespace Magento\Deploy\Model\Plugin;

use Magento\Deploy\Model\DeploymentConfig\ChangeDetector;
use Magento\Framework\App\FrontControllerInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Exception\LocalizedException;

class ConfigChangeDetector
{
    private $changeDetector;

    public function __construct(ChangeDetector $changeDetector)
    {
        $this->changeDetector = $changeDetector;
    }

    public function beforeDispatch(FrontControllerInterface $subject, RequestInterface $request)
    {
        if ($this->changeDetector->hasChanges()) {
            throw new LocalizedException(
                __(
                    'The configuration file has changed.'
                    . ' Run the "app:config:import" or the "setup:upgrade" command to synchronize the configuration.'
                )
            );
        }
    }
}