Platformsh\Cli\Helper\GitHelper::fetch PHP Method

    public function fetch($remote, $branch = null, $dir = null, $mustRun = false)
    {
        $args = ['fetch', $remote];
        if ($branch !== null) {
            $args[] = $branch;
        }
        return (bool) $this->execute($args, $dir, $mustRun, false);
    }