Added lxc? virtualization check

README.md

@@ -376,6 +376,17 @@ http_request 'http://...' do
 end
 ```
 
+### Virtualization
+- `lxc?`
+
+#### Examples
+```ruby
+service 'ntpd' do
+  action [:enable, :start]
+  not_if { lxc? }
+end
+```
+
 ### Filters
 - `compile_time` - accepts a block of resources to run at compile time
 - `before` - insert resource in the collection before the given resource

lib/chef/sugar.rb

@@ -35,6 +35,7 @@ module Sugar
     require_relative 'sugar/shell'
     require_relative 'sugar/vagrant'
     require_relative 'sugar/version'
+    require_relative 'sugar/virtualization'
   end
 end
 

lib/chef/sugar/virtualization.rb

@@ -0,0 +1,41 @@
+#
+# Copyright 2014, Joseph J. Nuspl Jr. <[email protected]>
+#
+# 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
+  module Sugar
+    module Virtualization
+      extend self
+
+      #
+      # Determine if the current node is running in a linux container.
+      #
+      # @param [Chef::Node] node
+      #
+      # @return [Boolean]
+      #   true if the machine is currently running in a container, false
+      #   otherwise
+      #
+      def lxc?(node)
+        node['virtualization'] && node['virtualization']['system'] == 'lxc'
+      end
+    end
+
+    module DSL
+      # @see Chef::Sugar::Virtualization#lxc?
+      def lxc?; Chef::Sugar::Virtualization.lxc?(node); end
+    end
+  end
+end

spec/unit/chef/sugar/virtualization_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+describe Chef::Sugar::Virtualization do
+  it_behaves_like 'a chef sugar'
+
+  describe '#lxc?' do
+    it 'returns true when the machine is a linux contianer' do
+      node = { 'virtualization' => { 'system' => 'lxc' } }
+      expect(described_class.lxc?(node)).to be_truthy
+    end
+
+    it 'returns false when the virtual machine is not lxc' do
+      node = { 'virtualization' => { 'system' => 'vbox' } }
+      expect(described_class.lxc?(node)).to be_falsey
+    end
+
+    it 'returns false when the machine is not virtual' do
+      node = {}
+      expect(described_class.lxc?(node)).to be_falsey
+    end
+  end
+end