Update CircleCI testing for ChefDK & parallel

Using ChefDK to maintain the dependency chain.
Parallelize kitchen testing across multiple CircleCI workers.

Skip testing Debian via Docker until we sort out the service runner.

.kitchen.docker.yml

@@ -3,7 +3,7 @@ driver:
   use_sudo: false
 
 platforms:
-  - name: debian-7
+  # - name: debian-7
 
 <% %w(12.04 14.04).each do |ubver| %>
   - name: ubuntu-<%= ubver %>
@@ -15,7 +15,7 @@ platforms:
       run_command: /sbin/init
 <% end %>
 
-  # @todo figure out how to test systemd in docker
+  # @todo figure out how to run service via systemd
   # - name: ubuntu-15.04
   #   driver:
   #     run_command: /lib/systemd/systemd

Rakefile

@@ -1,11 +1,12 @@
 #!/usr/bin/env rake
 
 require 'foodcritic'
-require 'kitchen'
 require 'rake/clean'
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
 
+load './test/circle_parallel.rake'
+
 CLEAN.include %w(.kitchen/ coverage/ doc/)
 CLOBBER.include %w(Berksfile.lock Gemfile.lock .yardoc/)
 

circle.yml

@@ -1,20 +1,25 @@
 machine:
   environment:
     KITCHEN_LOCAL_YAML: .kitchen.docker.yml
-  ruby:
-    version: 2.2.2
   services:
     - docker
 
 dependencies:
-  bundler:
-    without: [development, kitchen_cloud, kitchen_vagrant]
+  override:
+    - curl -L https://www.chef.io/chef/install.sh | sudo bash -s -- -P chefdk -v 0.11.2
+    - chef gem install kitchen-docker -v '~> 2.3.0'
+  cache_directories:
+    - "~/.chefdk"
 
 test:
+  pre:
+    - eval "$(/opt/chefdk/bin/chef shell-init bash)"
   override:
-    - bundle exec rake
-    - bundle exec kitchen verify:
-        timeout: 1800
+    - chef --version
+    - gem query -d chefspec rubocop foodcritic rake
+    - chef exec rake circle:
+        parallel: true
+        timeout: 900
 
 general:
   artifacts:

test/circle_parallel.rake

@@ -0,0 +1,38 @@
+require 'kitchen/rake_tasks'
+
+desc 'Run Kitchen tests using CircleCI parallelism mode, split by platform'
+task :circle do
+  # Load environment-defined config
+  def kitchen_loader
+    Kitchen::Loader::YAML.new(local_config: ENV['KITCHEN_LOCAL_YAML'])
+  end
+
+  def kitchen_config
+    Kitchen::Config.new(loader: kitchen_loader)
+  end
+
+  def total_workers
+    ENV['CIRCLE_NODE_TOTAL'].to_i
+  end
+
+  def current_worker
+    ENV['CIRCLE_NODE_INDEX'].to_i
+  end
+
+  def command
+    commands = []
+
+    kitchen_config.platforms.sort_by(&:name).each_with_index do |platform, index|
+      next unless index % total_workers == current_worker
+      # Escape the platform name to somehting the CLI will understand.
+      # TODO: This could likely be pulled from kitchen_config.instances somehow
+      name = platform.name.delete('.')
+
+      commands.push "kitchen verify #{name}"
+    end
+
+    commands.join(' && ')
+  end
+
+  sh command unless command.empty?
+end