core: Machine#action_raw for calling raw callables

lib/vagrant/machine.rb

@@ -158,12 +158,23 @@ module Vagrant
           :provider => @provider.to_s
       end
 
+      action_raw(name, callable, extra_env)
+    end
+
+    # This calls a raw callable in the proper context of the machine using
+    # the middleware stack.
+    #
+    # @param [Symbol] name Name of the action
+    # @param [Proc] callable
+    # @param [Hash] extra_env Extra env for the action env.
+    # @return [Hash] The resulting env
+    def action_raw(name, callable, extra_env=nil)
       # Run the action with the action runner on the environment
       env = {
-        :action_name    => "machine_action_#{name}".to_sym,
-        :machine        => self,
-        :machine_action => name,
-        :ui             => @ui
+        action_name: "machine_action_#{name}".to_sym,
+        machine: self,
+        machine_action: name,
+        ui: @ui,
       }.merge(extra_env || {})
       @env.action_runner.run(callable, env)
     end

test/unit/vagrant/machine_test.rb

@@ -261,6 +261,39 @@ describe Vagrant::Machine do
     end
   end
 
+  describe "#action_raw" do
+    let(:callable) {lambda { |e|
+      e[:called] = true
+      @env = e
+    }}
+
+    before do
+      @env = {}
+    end
+
+    it "should run the callable with the proper env" do
+      subject.action_raw(:foo, callable)
+
+      expect(@env[:called]).to be_true
+      expect(@env[:action_name]).to eq(:machine_action_foo)
+      expect(@env[:machine]).to equal(subject)
+      expect(@env[:machine_action]).to eq(:foo)
+      expect(@env[:ui]).to equal(subject.ui)
+    end
+
+    it "should return the environment as a result" do
+      result = subject.action_raw(:foo, callable)
+      expect(result).to equal(@env)
+    end
+
+    it "should merge in any extra env" do
+      subject.action_raw(:bar, callable, foo: :bar)
+
+      expect(@env[:called]).to be_true
+      expect(@env[:foo]).to eq(:bar)
+    end
+  end
+
   describe "#communicate" do
     it "should return the SSH communicator by default" do
       expect(subject.communicate).