Add a NoOp providertm/provider_no_op

This allows one to have a resource which is really only appropriate for
one platform, but available everywhere. Then you simply allow noop to
provide the resource everywhere besides where it's supposed to be.

3 files changed, 62 insertions, 0 deletions

diff --git a/lib/chef/provider/noop.rb b/lib/chef/provider/noop.rb
new file mode 100644
index 0000000000..207bf7dedb
--- /dev/null
+++ b/lib/chef/provider/noop.rb
@@ -0,0 +1,37 @@
+#
+# Author:: Thom May (<thom@chef.io>)
+# Copyright:: Copyright (c) 2016 Chef Software, Inc.
+# License:: Apache License, Version 2.0
+#
+# 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.
+#
+
+class Chef
+  class Provider
+    class Noop < Chef::Provider
+      def load_current_resource; end
+
+      def respond_to_missing?(method_sym, include_private = false)
+        method_sym.to_s.start_with?("action_") || super
+      end
+
+      def method_missing(method_sym, *arguments, &block)
+        if method_sym.to_s =~ /^action_/
+          Chef::Log.debug("NoOp-ing for #{method_sym}")
+        else
+          super
+        end
+      end
+    end
+  end
+end
diff --git a/lib/chef/providers.rb b/lib/chef/providers.rb
index 6fd67e0068..80fadfc8c2 100644
--- a/lib/chef/providers.rb
+++ b/lib/chef/providers.rb
@@ -41,6 +41,7 @@ require "chef/provider/log"
 require "chef/provider/ohai"
 require "chef/provider/mdadm"
 require "chef/provider/mount"
+require "chef/provider/noop"
 require "chef/provider/package"
 require "chef/provider/powershell_script"
 require "chef/provider/osx_profile"
diff --git a/spec/integration/recipes/noop_resource_spec.rb b/spec/integration/recipes/noop_resource_spec.rb
new file mode 100644
index 0000000000..c8ff3e6b5e
--- /dev/null
+++ b/spec/integration/recipes/noop_resource_spec.rb
@@ -0,0 +1,24 @@
+require "support/shared/integration/integration_helper"
+
+describe "Resources with a no-op provider" do
+  include IntegrationSupport
+
+  context "with noop provider providing foo" do
+    before(:context) {
+      class NoOpFoo < Chef::Resource
+        resource_name "hi_there"
+        default_action :update
+      end
+      Chef::Provider::Noop.provides :hi_there
+    }
+
+    it "does not blow up a run with a noop'd resource" do
+      recipe = converge {
+        hi_there "blah" do
+          action :update
+        end
+      }
+      expect(recipe.logged_warnings).to eq ""
+    end
+  end
+end