gistfile1.php

<?php

use Composer\Repository\Vcs\GitDriver;
use Composer\IO\NullIO;
use Composer\Config;
use Composer\Factory;

require_once 'vendor/autoload.php';
$a = new GitDriver(
    array('url' => 'git://digital-gitmirror-01/symfony/pluginCommon/'),
    new NullIO,
    Factory::createConfig()
);
$a->initialize();
$branches = $a->getBranches();
if (array_key_exists('versions/1.0-mb', $branches)) {
    exit(0);
}
exit(1);