RFC 59: Load Ohai pluginstm/ohai_plugins_2

This adds a new phase in the compilation of the run context.

Signed-off-by: Thom May <thom@chef.io>

1 files changed, 35 insertions, 0 deletions

diff --git a/lib/chef/run_context/cookbook_compiler.rb b/lib/chef/run_context/cookbook_compiler.rb
index 94635be03d..02ee2e3519 100644
--- a/lib/chef/run_context/cookbook_compiler.rb
+++ b/lib/chef/run_context/cookbook_compiler.rb
@@ -57,6 +57,7 @@ class Chef
 
       # Run the compile phase of the chef run. Loads files in the following order:
       # * Libraries
+      # * Ohai
       # * Attributes
       # * LWRPs
       # * Resource Definitions
@@ -69,6 +70,7 @@ class Chef
       # #cookbook_order for more information.
       def compile
         compile_libraries
+        compile_ohai_plugins
         compile_attributes
         compile_lwrps
         compile_resource_definitions
@@ -101,6 +103,26 @@ class Chef
         @events.library_load_complete
       end
 
+      # Loads Ohai Plugins from cookbooks, and ensure any old ones are
+      # properly cleaned out
+      def compile_ohai_plugins
+        ohai_plugin_count = count_files_by_segment(:ohai)
+        @events.ohai_plugin_load_start(ohai_plugin_count)
+        FileUtils.rm_rf(Chef::Config[:ohai_segment_plugin_path])
+
+        cookbook_order.each do |cookbook|
+          load_ohai_plugins_from_cookbook(cookbook)
+        end
+
+        # Doing a full ohai system check is costly, so only do so if we've loaded additional plugins
+        if ohai_plugin_count > 0
+          ohai = Ohai::System.new.run_additional_plugins(Chef::Config[:ohai_segment_plugin_path])
+          node.consume_ohai_data(ohai)
+        end
+
+        @events.ohai_plugin_load_complete
+      end
+
       # Loads attributes files from cookbooks. Attributes files are loaded
       # according to #cookbook_order; within a cookbook, +default.rb+ is loaded
       # first, then the remaining attributes files in lexical sort order.
@@ -226,6 +248,19 @@ class Chef
         raise
       end
 
+      def load_ohai_plugins_from_cookbook(cookbook_name)
+        target = Chef::Config[:ohai_segment_plugin_path]
+        files_in_cookbook_by_segment(cookbook_name, :ohai).each do |filename|
+          next unless File.extname(filename) == ".rb"
+
+          Chef::Log.debug "Loading Ohai plugin: #{filename} from #{cookbook_name}"
+          target_name = File.join(target, cookbook_name.to_s, File.basename(filename))
+
+          FileUtils.mkdir_p(File.dirname(target_name))
+          FileUtils.cp(filename, target_name)
+        end
+      end
+
       def load_resource_definitions_from_cookbook(cookbook_name)
         files_in_cookbook_by_segment(cookbook_name, :definitions).each do |filename|
           begin