Platformsh\Cli\Local\LocalApplication::normalizeConfig PHP Method

    protected function normalizeConfig(array $config)
    {
        // Backwards compatibility with old config format: `toolstack` is
        // changed to application `type` and `build`.`flavor`.
        if (isset($config['toolstack'])) {
            if (!strpos($config['toolstack'], ':')) {
                throw new InvalidConfigException("Invalid value for 'toolstack'");
            }
            list($config['type'], $config['build']['flavor']) = explode(':', $config['toolstack'], 2);
        }
        // The `web` section has changed to `web`.`locations`.
        if (isset($config['web']) && !isset($config['web']['locations'])) {
            $map = ['document_root' => 'root', 'expires' => 'expires', 'passthru' => 'passthru'];
            foreach ($map as $key => $newKey) {
                if (array_key_exists($key, $config['web'])) {
                    $config['web']['locations']['/'][$newKey] = $config['web'][$key];
                }
            }
        }
        return $config;
    }