ChangeDetector.php

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

use Magento\Deploy\Model\DeploymentConfig\Hash\Generator as HashGenerator;

class ChangeDetector
{
    private $configHash;

    private $hashGenerator;

    private $dataConfigCollector;

    public function __construct(
        Hash $configHash,
        HashGenerator $hashGenerator,
        DataCollector $dataConfigCollector
    ) {
        $this->configHash = $configHash;
        $this->hashGenerator = $hashGenerator;
        $this->dataConfigCollector = $dataConfigCollector;
    }

    public function hasChanges($sectionName = null)
    {
        $configs = $this->dataConfigCollector->getConfig($sectionName);
        $hashes = $this->configHash->get();

        foreach ($configs as $section => $config) {
            if (null === $config) {
                continue;
            }
            $savedHash = isset($hashes[$section]) ? $hashes[$section] : null;
            $generatedHash = empty($config) && !$savedHash ? null : $this->hashGenerator->generate($config);
            if ($generatedHash !== $savedHash) {
                return true;
            }
        }

        return false;
    }
}