+ if ( $restrictionMethod === 'autodetect' ) {
+ // On Linux systems check for firejail
+ if ( PHP_OS === 'Linux' && $this->findFirejail() !== false ) {
+ $this->restrictionMethod = 'firejail';
+ } else {
+ $this->restrictionMethod = false;
+ }
+ } else {
+ $this->restrictionMethod = $restrictionMethod;
+ }