Put the machine action in the middleware env

lib/vagrant/action/builtin/provision.rb

@@ -50,7 +50,7 @@ module Vagrant
               next if env[:provision_types] && \
                 !env[:provision_types].include?(type_map[p])
 
-              run_provisioner(p)
+              run_provisioner(env, p)
             end
           end
         end
@@ -58,7 +58,7 @@ module Vagrant
         # This is pulled out into a seperate method so that users can
         # subclass and implement custom behavior if they'd like around
         # this step.
-        def run_provisioner(p)
+        def run_provisioner(env, p)
           env[:ui].info(I18n.t("vagrant.actions.vm.provision.beginning",
                                :provisioner => p.class))
 

lib/vagrant/machine.rb

@@ -122,6 +122,7 @@ module Vagrant
       # Run the action with the action runner on the environment
       env = {
         :machine        => self,
+        :machine_action => name,
         :ui             => @env.ui_class.new(@name)
       }.merge(extra_env || {})
       @env.action_runner.run(callable, env)