Index.php

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<?php
namespace Magento\Version\Controller\Index;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\ProductMetadataInterface;

class Index extends Action implements HttpGetActionInterface
{
    protected $productMetadata;

    public function __construct(Context $context, ProductMetadataInterface $productMetadata)
    {
        $this->productMetadata = $productMetadata;
        parent::__construct($context);
    }

    public function execute()
    {
        $version = $this->productMetadata->getVersion();
        $versionParts = explode('.', $version);
        if ((!isset($versionParts[0]) || !isset($versionParts[1]))
            || $this->isGitBasedInstallation($version)
        ) {
            return;
        }
        $majorMinorVersion = $versionParts[0] . '.' . $versionParts[1];
        $this->getResponse()->setBody(
            $this->productMetadata->getName() . '/' .
            $majorMinorVersion . ' (' .
            $this->productMetadata->getEdition() . ')'
        );
    }

    private function isGitBasedInstallation($fullVersion)
    {
        $versionParts = explode('-', $fullVersion);
        return (isset($versionParts[0]) && $versionParts[0] == 'dev');
    }
}