private function isSuperUser()
{
$optVarName = $this->config->envVarNameForPushUser();
return $optVarName->map(function ($varName) {
$superUsers = $this->config->superUserNames();
$this->logger->trace(count($superUsers) . " superuser(s) configured");
$currentUser = getenv($varName);
$this->logger->trace("Current {$varName} is {$currentUser}");
return in_array($currentUser, $superUsers);
})->getOrElse(false);
}