DependencyReadinessCheck.php

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<?php
namespace Magento\Setup\Model;

use Magento\Composer\MagentoComposerApplication;
use Magento\Composer\RequireUpdateDryRunCommand;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Composer\ComposerJsonFinder;
use Magento\Framework\Composer\MagentoComposerApplicationFactory;
use Magento\Framework\Filesystem\Driver\File;

class DependencyReadinessCheck
{
    private $composerJsonFinder;

    private $directoryList;

    private $requireUpdateDryRunCommand;

    private $file;

    private $magentoComposerApplication;

    public function __construct(
        ComposerJsonFinder $composerJsonFinder,
        DirectoryList $directoryList,
        File $file,
        MagentoComposerApplicationFactory $composerAppFactory
    ) {
        $this->composerJsonFinder = $composerJsonFinder;
        $this->directoryList = $directoryList;
        $this->file = $file;
        $this->requireUpdateDryRunCommand = $composerAppFactory->createRequireUpdateDryRunCommand();
        $this->magentoComposerApplication = $composerAppFactory->create();
    }

    public function runReadinessCheck(array $packages)
    {
        $composerJson = $this->composerJsonFinder->findComposerJson();
        $this->file->copy($composerJson, $this->directoryList->getPath(DirectoryList::VAR_DIR) .  '/composer.json');
        $workingDir = $this->directoryList->getPath(DirectoryList::VAR_DIR);
        try {
            foreach ($packages as $package) {
                if (strpos($package, 'magento/product-enterprise-edition') !== false) {
                    $this->magentoComposerApplication->runComposerCommand(
                        [
                            'command' => 'remove',
                            'packages' => ['magento/product-community-edition'],
                            '--no-update' => true
                        ],
                        $workingDir
                    );
                }
            }
            $this->requireUpdateDryRunCommand->run($packages, $workingDir);
            return ['success' => true];
        } catch (\RuntimeException $e) {
            $message = str_replace(PHP_EOL, '<br/>', htmlspecialchars($e->getMessage()));
            return ['success' => false, 'error' => $message];
        }
    }
}