upgrade.php

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<?php
// we want to know if an error occurs
ini_set('display_errors', 1);

define('UPGRADING', 'upgrading');
require_once(dirname(__FILE__) . "/engine/start.php");

$site_url = elgg_get_config('url');
$site_host = parse_url($site_url, PHP_URL_HOST) . '/';

// turn any full in-site URLs into absolute paths
$forward_url = get_input('forward', '/admin', false);
$forward_url = str_replace(array($site_url, $site_host), '/', $forward_url);

if (strpos($forward_url, '/') !== 0) {
    $forward_url = '/' . $forward_url;
}

if (get_input('upgrade') == 'upgrade') {

    $upgrader = new Elgg_UpgradeService();
    $result = $upgrader->run();
    if ($result['failure'] == true) {
        register_error($result['reason']);
        forward($forward_url);
    }
} else {
    // test the URL rewrite rules
    if (!class_exists('ElggRewriteTester')) {
        require dirname(__FILE__) . '/install/ElggRewriteTester.php';
    }
    $rewriteTester = new ElggRewriteTester();
    $url = elgg_get_site_url() . "__testing_rewrite?__testing_rewrite=1";
    if (!$rewriteTester->runRewriteTest($url)) {
        // see if there is a problem accessing the site at all
        // due to ip restrictions for example
        if (!$rewriteTester->runLocalhostAccessTest()) {
            // note: translation may not be available until after upgrade
            $msg = elgg_echo("installation:htaccess:localhost:connectionfailed");
            if ($msg === "installation:htaccess:localhost:connectionfailed") {
                $msg = "Elgg cannot connect to itself to test rewrite rules properly. Check "
                        . "that curl is working and there are no IP restrictions preventing "
                        . "localhost connections.";
            }
            echo $msg;
            exit;
        }

        // note: translation may not be available until after upgrade
        $msg = elgg_echo("installation:htaccess:needs_upgrade");
        if ($msg === "installation:htaccess:needs_upgrade") {
            $msg = "You must update your .htaccess file so that the path is injected "
                . "into the GET parameter __elgg_uri (you can use htaccess_dist as a guide).";
        }
        echo $msg;
        exit;
    }

    // if upgrading from < 1.8.0, check for the core view 'welcome' and bail if it's found.
    // see https://github.com/elgg/elgg/issues/3064
    // we're not checking the view itself because it's likely themes will override this view.
    // we're only concerned with core files.
    $welcome = dirname(__FILE__) . '/views/default/welcome.php';
    if (file_exists($welcome)) {
        elgg_set_viewtype('failsafe');
        // can't have pretty messages because we don't know the state of the views.
        $content = elgg_echo('upgrade:unable_to_upgrade_info');
        $title = elgg_echo('upgrade:unable_to_upgrade');

        echo elgg_view_page($title, $content);
        exit;
    }

    $vars = array(
        'forward' => $forward_url
    );

    echo elgg_view_page(elgg_echo('upgrading'), '', 'upgrade', $vars);
    exit;
}

forward($forward_url);