Add a noop_resource function

A function to create noop providers (set as the default) for the named
resource. This works alongside of 'puppet apply --tags' to disable
some custom resource types that still attempt to run commands during
prefetch, etc.

Change-Id: Icabdb30369c8ca15e77d169dc441bee8cfd3631f

lib/puppet/parser/functions/noop_resource.rb

@@ -0,0 +1,53 @@
+# Copyright 2017 Red Hat, Inc.
+# All Rights Reserved.
+#
+# 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.
+#
+# Author: Dan Prince <dprince@redhat.com>
+#
+# A function to create noop providers (set as the default) for the named
+# resource. This works alongside of 'puppet apply --tags' to disable
+# some custom resource types that still attempt to run commands during
+# prefetch, etc.
+class Puppet::Provider::Noop < Puppet::Provider
+
+  def create
+    true
+  end
+
+  def destroy
+    true
+  end
+
+  def exists?
+    false
+  end
+
+  # some puppet-keystone resources require this
+  def self.resource_to_name(domain, name, check_for_default = true)
+    return name
+  end
+
+end
+
+module Puppet::Parser::Functions
+  newfunction(:noop_resource, :type => :rvalue, :doc => "Create a default noop provider for the specified resource.") do |arg|
+    if arg[0].class == String
+        Puppet::Type.type(arg[0].downcase.to_sym).provide(:noop, :parent => Puppet::Provider::Noop) do
+           defaultfor :osfamily => :redhat
+        end
+    else
+    end
+    return true
+  end
+end