configurator.rb in rconf-0.5.8

- old
+ new

@@ -7,10 +7,12 @@
 # licensee is strictly subject to the terms and conditions,
 # including confidentiality obligations, set forth in the applicable
 # License Agreement between RightScale.com, Inc. and
 # the licensee
 
+require 'digest/sha1'
+
 module RightConf
 
   # Configurator mixin, defines DSL and common validation method
   module Configurator
 
@@ -116,11 +118,25 @@
     # 
     # === Return
     # true:: Always return true
     def run(*args)
       init
-      Platform.dispatch(*args) { :run }
+      sha = Profile.configurator_signature(self.class.key)
+      if sha != signature
+        Platform.dispatch(*args) { :run }
+        Profile.set_configurator_signature(self.class.key, signature)
+      end
       true
+    end
+
+    # Calculate unique SHA for current settings
+    #
+    # === Return
+    # sha(String):: SHA for current settings
+    def signature
+      return '' if @settings_values.nil?
+      blob = @settings_values.inject('') { |b, (k, v)| b += "#{k}:#{v};" }
+      sha = Digest::SHA1.hexdigest(blob)
     end
 
     # Get value of configuration option
     #
     # === Parameters