+ /**
+ * Bitfield helper on whether a specific restriction is enabled
+ *
+ * @param int $restriction
+ *
+ * @return bool
+ */
+ protected function hasRestriction( $restriction ) {
+ return ( $this->restrictions & $restriction ) === $restriction;
+ }
+
+ /**
+ * If called, only the files/directories that are
+ * whitelisted will be available to the shell command.
+ *
+ * limit.sh will always be whitelisted
+ *
+ * @param string[] $paths
+ *
+ * @return $this
+ */
+ public function whitelistPaths( array $paths ) {
+ // Default implementation is a no-op
+ return $this;
+ }
+
+ /**
+ * String together all the options and build the final command
+ * to execute
+ *
+ * @param string $command Already-escaped command to run
+ * @return array [ command, whether to use log pipe ]
+ */
+ protected function buildFinalCommand( $command ) {