Shell.php

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<?php
namespace Magento\Framework;

use Magento\Framework\Shell\CommandRendererInterface;

class Shell implements ShellInterface
{
    protected $logger;

    private $commandRenderer;

    public function __construct(
        CommandRendererInterface $commandRenderer,
        \Psr\Log\LoggerInterface $logger = null
    ) {
        $this->logger = $logger;
        $this->commandRenderer = $commandRenderer;
    }

    public function execute($command, array $arguments = [])
    {
        $command = $this->commandRenderer->render($command, $arguments);
        $this->log($command);

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

        exec($command, $output, $exitCode);
        $output = implode(PHP_EOL, $output);
        $this->log($output);

        if ($exitCode) {
            $commandError = new \Exception($output, $exitCode);
            throw new Exception\LocalizedException(
                new \Magento\Framework\Phrase("Command returned non-zero exit code:\n`%1`", [$command]),
                $commandError
            );
        }
        return $output;
    }

    protected function log($message)
    {
        if ($this->logger) {
            $this->logger->info($message);
        }
    }
}