Remove the ErrorHalt middleware, since Warden takes care of this on a larger scale

lib/vagrant/action/builder.rb

@@ -110,13 +110,9 @@ module Vagrant
       # @param [Vagrant::Action::Environment] env The action environment
       # @return [Object] A callable object
       def to_app(env)
-        # Prepend the error halt task so errneous environments are halted
-        # before the chain even begins.
-        middleware = stack.dup.push([Env::ErrorHalt, [], nil])
-
-        # Convert each middleware into a lambda which takes the next
-        # middleware.
-        Vagrant::Action::Warden.new(middleware, env)
+        # Wrap the middleware stack with the Warden to provide a consistent
+        # and predictable behavior upon exceptions.
+        Warden.new(stack.dup, env)
       end
 
       # Runs the builder stack with the given environment.

lib/vagrant/action/env/error_halt.rb

@@ -1,16 +0,0 @@
-module Vagrant
-  class Action
-    module Env
-      # A middleware which simply halts if the environment is erroneous.
-      class ErrorHalt
-        def initialize(app,env)
-          @app = app
-        end
-
-        def call(env)
-          @app.call(env) if !env.error?
-        end
-      end
-    end
-  end
-end

test/vagrant/action/builder_test.rb

@@ -159,17 +159,6 @@ class ActionBuilderTest < Test::Unit::TestCase
         Vagrant::Action.actions.clear
       end
 
-      should "preprend error halt to the chain" do
-        result = mock("result")
-        env = {:a => :b}
-        middleware = mock("middleware")
-        middleware.stubs(:is_a?).with(Class).returns(true)
-        middleware.expects(:new).with(anything, env).returns(result)
-        @instance.use middleware
-        result = @instance.to_app(env).actions.first
-        assert result.kind_of?(Vagrant::Action::Env::ErrorHalt)
-      end
-
       should "make non-classes lambdas" do
         env = Vagrant::Action::Environment.new(nil)
         env.expects(:foo).once

test/vagrant/action/env/error_halt_test.rb

@@ -1,21 +0,0 @@
-require "test_helper"
-
-class ErrorHaltEnvActionTest < Test::Unit::TestCase
-  setup do
-    @klass = Vagrant::Action::Env::ErrorHalt
-    @app, @env = mock_action_data
-    @instance = @klass.new(@app, @env)
-  end
-
-  should "continue the chain if no error" do
-    assert !@env.error?
-    @app.expects(:call).with(@env).once
-    @instance.call(@env)
-  end
-
-  should "halt the chain if an error occured" do
-    @env.error!(:foo)
-    @app.expects(:call).never
-    @instance.call(@env)
-  end
-end