Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/ohai/resources/plugin.rb

@@ -0,0 +1,69 @@
+property :plugin_name, String, name_property: true
+property :path, String
+property :source_file, String
+property :cookbook, String
+property :resource, [:cookbook_file, :template], default: :cookbook_file
+property :variables, Hash
+property :compile_time, [true, false], default: true
+
+action :create do
+  # why create_if_missing you ask?
+  # no one can agree on perms and this allows them to manage the perms elsewhere
+  directory desired_plugin_path do
+    action :create
+    recursive true
+    not_if { ::File.exist?(desired_plugin_path) }
+  end
+
+  if new_resource.resource.eql?(:cookbook_file)
+    cookbook_file ::File.join(desired_plugin_path, new_resource.plugin_name + '.rb') do
+      cookbook new_resource.cookbook
+      source new_resource.source_file || "#{new_resource.plugin_name}.rb"
+      notifies :reload, "ohai[#{new_resource.plugin_name}]", :immediately
+    end
+  elsif new_resource.resource.eql?(:template)
+    template ::File.join(desired_plugin_path, new_resource.plugin_name + '.rb') do
+      cookbook new_resource.cookbook
+      source new_resource.source_file || "#{new_resource.plugin_name}.rb"
+      variables new_resource.variables
+      notifies :reload, "ohai[#{new_resource.plugin_name}]", :immediately
+    end
+  end
+
+  # Add the plugin path to the ohai plugin path if need be and warn
+  # the user that this is going to result in a reload every run
+  unless in_plugin_path?(desired_plugin_path)
+    plugin_path_warning
+    Chef::Log.warn("Adding #{desired_plugin_path} to the Ohai plugin path for this chef-client run only")
+    add_to_plugin_path(desired_plugin_path)
+    reload_required = true
+  end
+
+  ohai new_resource.plugin_name do
+    action :nothing
+    action :reload if reload_required
+  end
+end
+
+action :delete do
+  file ::File.join(desired_plugin_path, new_resource.plugin_name + '.rb') do
+    action :delete
+    notifies :reload, 'ohai[reload ohai post plugin removal]'
+  end
+
+  ohai 'reload ohai post plugin removal' do
+    action :nothing
+  end
+end
+
+action_class do
+  include OhaiCookbook::PluginHelpers
+end
+
+# this resource forces itself to run at compile_time
+def after_created
+  return unless compile_time
+  Array(action).each do |action|
+    run_action(action)
+  end
+end