Success.php

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<?php
namespace Magento\Setup\Controller;

use Magento\Framework\Module\ModuleList;
use Magento\Setup\Model\ObjectManagerProvider;
use Zend\Mvc\Controller\AbstractActionController;
use Zend\View\Model\ViewModel;

class Success extends AbstractActionController
{
    protected $moduleList;

    protected $objectManagerProvider;

    public function __construct(ModuleList $moduleList, ObjectManagerProvider $objectManagerProvider)
    {
        $this->moduleList = $moduleList;
        $this->objectManagerProvider = $objectManagerProvider;
    }

    public function indexAction()
    {
        if ($this->moduleList->has('Magento_SampleData')) {
            $sampleData = $this->objectManagerProvider->get()->get(\Magento\Framework\Setup\SampleData\State::class);
            $isSampleDataErrorInstallation = $sampleData->hasError();
        } else {
            $isSampleDataErrorInstallation = false;
        }
        $view = new ViewModel([
            'isSampleDataErrorInstallation' => $isSampleDataErrorInstallation
        ]);
        $view->setTerminal(true);
        return $view;
    }
}