eveseat/installer

<?php

/*
 * This file is part of SeAT
 *
 * Copyright (C) 2015 to 2021 Leon Jacobs
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

namespace Seat\Installer\Traits;

use Symfony\Component\Filesystem\Filesystem;

/**
 * Class DetectsOperatingSystem.
 * @package Seat\Installer\Traits
 */
trait DetectsOperatingSystem
{
    /**
     * @var array
     */
    protected $release_files = [
        'ubuntu' => 'lsb-release',
        'centos' => 'centos-release',
        'debian' => 'debian_version',
    ];

    /**
     * Strings to match to a version of a distribution.
     *
     * @var array
     */
    protected $release_versions = [
        'ubuntu' => [
            [
                'version'   => '16.04',
                'signature' => 'Ubuntu 16.04',
            ],
            [
                'version'   => '18.04',
                'signature' => 'Ubuntu 18.04',
            ],
            [
                'version'   => '20.04',
                'signature' => 'Ubuntu 20.04',
            ],
        ],
        'centos' => [
            [
                'version'   => '7',
                'signature' => 'CentOS Linux release 7',
            ],
            [
                'version'   => '6',
                'signature' => 'CentOS release 6.',
            ],
        ],
        'debian' => [
            [
                'version'   => '8',
                'signature' => '8.',
            ],
            [
                'version'   => '9',
                'signature' => '9.',
            ],
        ],
    ];

    /**
     * @var array
     */
    protected $os_version = [
        'os'      => null,
        'version' => null,
    ];

    /**
     * @var string
     */
    protected $basepath = '/etc';

    /**
     * @return array
     */
    public function getOperatingSystem(): array
    {

        $fs = new Filesystem();

        foreach ($this->release_files as $distro => $file) {

            $filename = $this->basepath . '/' . $file;

            if ($fs->exists($filename)) {

                // Read the release file to try and determine the version.
                $contents = file_get_contents($filename);

                foreach ($this->release_versions[$distro] as $info) {

                    // Check if the release file has the signature for
                    // the version match.
                    if (strpos($contents, $info['signature']) !== false) {

                        // Update version information
                        $this->os_version['os'] = $distro;
                        $this->os_version['version'] = $info['version'];

                    }
                }
            }

        }

        return $this->os_version;

    }
}