Fail when `mkdir' misses arguments

lib/producer/core/actions/mkdir.rb

@@ -3,6 +3,8 @@ module Producer
     module Actions
       class Mkdir < Action
         def setup
+          check_arguments_size! 1
+          @path = Pathname.new(arguments.first)
           @options[:permissions]  = @options.delete :mode if @options.key? :mode
           @options[:owner]        = @options.delete :user if @options.key? :user
         end
@@ -12,19 +14,12 @@ module Producer
         end
 
         def apply
-          path.descend do |p|
+          @path.descend do |p|
             next if fs.dir? p
             fs.mkdir p.to_s
             fs.setstat p.to_s, @options unless @options.empty?
           end
         end
-
-
-        private
-
-        def path
-          Pathname.new(arguments.first)
-        end
       end
     end
   end