<?php

namespace App;

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    private ?string $releaseCacheDir = null;

    public function getCacheDir(): string
    {
        // A web update still needs its compiled services until the response has finished.
        // The next release builds its own cache without deleting the running request's files.
        return $this->releaseCacheDir ??= parent::getCacheDir().'/release-'.substr(
            hash_file('sha256', $this->getProjectDir().'/VERSION'),
            0,
            16,
        );
    }
}