Merge pull request #16 from satoruh/master

Raise exception if ip_ranges or groups have duplicate values.

lib/piculet/dsl/permission.rb

@@ -38,6 +38,10 @@ def ip_ranges(*values)
                 end
               end
 
+              if values.size != values.uniq.size
+                raise "SecurityGroup `#{@security_group}\: #{@direction}: #{@protocol_prot_range}: `ip_ranges`: duplicate ip ranges"
+              end
+
               @result.ip_ranges = values
             end
 
@@ -52,6 +56,10 @@ def groups(*values)
                 end
               end
 
+              if values.size != values.uniq.size
+                raise "SecurityGroup `#{@security_group}\: #{@direction}: #{@protocol_prot_range}: `groups`: duplicate groups"
+              end
+
               @result.groups = values
             end
           end # Permission