UI class has a reference to the environment

lib/vagrant/command/base.rb

@@ -45,7 +45,7 @@ module Vagrant
         # The last argument must _always_ be a Vagrant Environment class.
         raise CLIMissingEnvironment.new("This command requires that a Vagrant environment be properly passed in as the last parameter.") if !config[:env]
         @env = config[:env]
-        @env.ui = UI::Shell.new(shell) if !@env.ui.is_a?(UI::Shell)
+        @env.ui = UI::Shell.new(@env, shell) if !@env.ui.is_a?(UI::Shell)
       end
     end
   end

lib/vagrant/command/group_base.rb

@@ -31,7 +31,7 @@ module Vagrant
         # The last argument must _always_ be a Vagrant Environment class.
         raise CLIMissingEnvironment.new("This command requires that a Vagrant environment be properly passed in as the last parameter.") if !config[:env]
         @env = config[:env]
-        @env.ui = UI::Shell.new(shell) if !@env.ui.is_a?(UI::Shell)
+        @env.ui = UI::Shell.new(@env, shell) if !@env.ui.is_a?(UI::Shell)
       end
     end
   end

lib/vagrant/environment.rb

@@ -138,7 +138,7 @@ module Vagrant
     # Returns the {UI} for the environment, which is responsible
     # for talking with the outside world.
     def ui
-      @ui ||= UI.new
+      @ui ||= UI.new(self)
     end
 
     #---------------------------------------------------------------

lib/vagrant/ui.rb

@@ -3,6 +3,12 @@ module Vagrant
   # through a shell). They must respond to the typically logger methods
   # of `warn`, `error`, `info`, and `confirm`.
   class UI
+    attr_reader :env
+
+    def initialize(env)
+      @env = env
+    end
+
     [:warn, :error, :info, :confirm].each do |method|
       # By default these methods don't do anything. A silent UI.
       define_method(method) { |message| }
@@ -11,7 +17,9 @@ module Vagrant
     # A shell UI, which uses a `Thor::Shell` object to talk with
     # a terminal.
     class Shell < UI
-      def initialize(shell)
+      def initialize(env, shell)
+        super(env)
+
         @shell = shell
       end