Driver.php

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<?php
namespace Magento\Framework\Shell;

use Magento\Framework\Exception\LocalizedException;

class Driver
{
    private $commandRenderer;

    public function __construct(CommandRendererInterface $commandRenderer)
    {
        $this->commandRenderer = $commandRenderer;
    }

    public function execute($command, $arguments)
    {
        $disabled = explode(',', str_replace(' ', ',', ini_get('disable_functions')));
        if (in_array('exec', $disabled)) {
            throw new LocalizedException(new \Magento\Framework\Phrase('The exec function is disabled.'));
        }

        $command = $this->commandRenderer->render($command, $arguments);
        exec($command, $output, $exitCode);
        $output = implode(PHP_EOL, $output);
        return new Response(['output' => $output, 'exit_code' => $exitCode, 'escaped_command' => $command]);
    }
}