run_file path validation for CFEngine

plugins/provisioners/cfengine/config.rb

@@ -91,6 +91,13 @@ module VagrantPlugins
           errors << I18n.t("vagrant.cfengine_config.classes_array")
         end
 
+        if @run_file
+          expanded = Pathname.new(@run_file).expand_path(machine.env.root_path)
+          if !expanded.file?
+            errors << I18n.t("vagrant.cfengine_config.run_file_not_found")
+          end
+        end
+
         { "CFEngine" => errors }
       end
     end

templates/locales/en.yml

@@ -24,6 +24,8 @@ en:
         The mode must be 'bootstrap' or 'single_run'
       policy_server_address: |-
         The policy server address must be set for bootstrapping.
+      run_file_not_found: |-
+        The 'run_file' specified could not be found.
 
     general:
       batch_unexpected_error: |-