Environment#hook allows hooks to be run at arbitrary points

lib/vagrant/environment.rb

@@ -124,6 +124,9 @@ module Vagrant
 
       # Load the plugins
       load_plugins
+
+      # Call the environment load hooks
+      hook(:environment_load)
     end
 
     # Return a human-friendly string for pretty printed or inspected
@@ -236,6 +239,15 @@ module Vagrant
       @config_global
     end
 
+    # This defines a hook point where plugin action hooks that are registered
+    # against the given name will be run in the context of this environment.
+    #
+    # @param [Symbol] name Name of the hook.
+    def hook(name)
+      callable = Proc.new {}
+      action_runner.run(callable, :action_name => name)
+    end
+
     # This returns a machine with the proper provider for this environment.
     # The machine named by `name` must be in this environment.
     #

test/unit/vagrant/environment_test.rb

@@ -205,6 +205,18 @@ describe Vagrant::Environment do
     end
   end
 
+  describe "#hook" do
+    it "should call the action runner with the proper hook" do
+      hook_name = :foo
+
+      instance.action_runner.should_receive(:run).with do |callable, env|
+        env[:action_name].should == hook_name
+      end
+
+      instance.hook(hook_name)
+    end
+  end
+
   describe "primary machine name" do
     it "should be the only machine if not a multi-machine environment" do
       instance.primary_machine_name.should == instance.machine_names.first