Added basic skeleton for DscResource provider

2 files changed, 118 insertions, 6 deletions

diff --git a/lib/chef/provider/dsc_resource.rb b/lib/chef/provider/dsc_resource.rb
new file mode 100644
index 0000000000..bfc3b2fecc
--- /dev/null
+++ b/lib/chef/provider/dsc_resource.rb
@@ -0,0 +1,118 @@
+#
+# Author:: Adam Edwards (<adamed@getchef.com>)
+#
+# Copyright:: 2014, Chef Software, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'chef/util/powershell/cmdlet'
+require 'chef/util/dsc/local_configuration_manager'
+require 'chef/mixin/powershell_type_coercions'
+
+class Chef
+  class Provider
+    class DscResource < Chef::Provider
+
+      provides :dsc_resource, os: "windows"
+
+      def initialize(new_resource, run_context)
+        super
+        @new_resource = new_resource
+        @resource_converged = false
+      end
+
+      def action_run
+        if ! @resource_converged
+          converge_by(generate_description) do
+            set_configuration
+          end
+        end
+      end
+
+      def load_current_resource
+        @resource_converged = test_resource
+      end
+
+      def whyrun_supported?
+        true
+      end
+
+      def define_resource_requirements
+        requirements.assert(:run) do |a|
+          a.assertion { supports_dsc_invoke_resource? }
+          err = "Assuming a previous resource installs Powershell 5.0.10018.0 or higher."
+          a.failure_message Chef::Exceptions::NoProviderAvailable,
+            err
+          a.whyrun err
+          a.block_action!
+        end
+        requirements.assert(:run) do |a|
+          a.assertion {
+            local_configuration_manager.meta_configuration['RefreshMode'] == 'Disabled'
+          }
+          err = ["The LCM must have its RefreshMode set to Disabled. "]
+          a.failure_message Chef::Exceptions::NoProviderAvailable, err.join(' ')
+          a.whyrun err + ["Assuming a previous resource sets the RefreshMode."]
+          a.block_action!
+        end
+      end
+
+      protected
+
+      def local_configuration_manager
+        @local_configuration_manager ||= Chef::Util::DSC::LocalConfigurationManager(
+          @run_context.node,
+          nil
+        )
+      end
+
+      def supports_dsc_invoke_resource?
+        run_context && Chef::Platform.supports_dsc_invoke_resource?(node)
+      end
+
+      def generate_description
+        "Converge dsc resource"
+      end
+
+      def test_resource
+        result = invoke_resource(:test)
+        result.return_value["IsDesiredState"]
+      end
+
+      def set_resource
+        result = invoke_resource(:set)
+        result.return_value
+      end
+
+      def invoke_resource(method)
+        properties = translate_type(@new_resource.properties)
+        switches = "-Method #{method.to_s} -Name #{@new_resource.resource} -Property"
+            + "#{properties} -Verbose"
+        cmdlet = Chef::Util::Powershell::Cmdlet.new(
+          @node,
+          "Invoke-DscResource #{switches}",
+          :object
+        )
+        cmdlet.run!
+      end
+
+      def meta_configuration
+        cmdlet = Chef::Util::Powershell::Cmdlet.new(@node, "Get-DscLocalConfigurationManager", :object)
+        result = cmdlet.run!
+        result.return_value
+      end
+
+    end
+  end
+end
diff --git a/lib/chef/util/dsc/local_configuration_manager.rb b/lib/chef/util/dsc/local_configuration_manager.rb
index 355592b9a4..f8398341e5 100644
--- a/lib/chef/util/dsc/local_configuration_manager.rb
+++ b/lib/chef/util/dsc/local_configuration_manager.rb
@@ -43,12 +43,6 @@ class Chef::Util::DSC
       end
     end
 
-    def meta_configuration
-      cmdlet = Chef::Util::Powershell::Cmdlet.new(@node, "Get-DscLocalConfigurationManager", :object)
-      result = cmdlet.run!
-      result.return_value
-    end
-
     private
 
     def run_configuration_cmdlet(configuration_document, apply_configuration, shellout_flags)