[CHEF-3249] Basic implementation of partials in templates.

2 files changed, 20 insertions, 0 deletions

diff --git a/lib/chef/mixin/template.rb b/lib/chef/mixin/template.rb
index 78148d2577..c25f5f6e1f 100644
--- a/lib/chef/mixin/template.rb
+++ b/lib/chef/mixin/template.rb
@@ -29,6 +29,22 @@ class Chef
           raise "Could not find a value for node. If you are explicitly setting variables in a template, " +
                 "include a node variable if you plan to use it."
         end
+
+        def render(partial_name, variables = nil)
+          raise "You cannot render partials in this context" unless @partial_resolver
+
+          if variables
+            context = {}
+            context.merge!(variables)
+            context[:node] = node
+          else
+            context = self.dup
+          end
+
+          template_location = @partial_resolver.call(partial_name)
+          eruby = Erubis::Eruby.new(IO.read(template_location))
+          output = eruby.evaluate(context)
+        end
       end
       
       ::Erubis::Context.send(:include, ChefContext)
diff --git a/lib/chef/provider/template.rb b/lib/chef/provider/template.rb
index c937b9d980..cce3418f91 100644
--- a/lib/chef/provider/template.rb
+++ b/lib/chef/provider/template.rb
@@ -109,6 +109,10 @@ class Chef
         context = {}
         context.merge!(@new_resource.variables)
         context[:node] = node
+        context[:partial_resolver] = lambda do
+          cookbook = _run_context.cookbook_collection[resource_cookbook]
+          partial_location = cookbook.preferred_filename_on_disk_location(node, :templates, partial_name)
+        end
         render_template(IO.read(template_location), context, &block)
       end