From af2690635e50db471d098ea10eb29f9d1c7a1de5 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Thu, 28 Feb 2013 00:16:30 -0800
Subject: [PATCH] Unknown keys return a DummyConfig rather than OpenStruct

---
 lib/vagrant/config/v1.rb                      |  1 +
 lib/vagrant/config/v1/dummy_config.rb         | 13 ++++++++++
 lib/vagrant/config/v1/root.rb                 |  3 +--
 .../vagrant/config/v1/dummy_config_test.rb    | 24 +++++++++++++++++++
 4 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 lib/vagrant/config/v1/dummy_config.rb
 create mode 100644 test/unit/vagrant/config/v1/dummy_config_test.rb

diff --git a/lib/vagrant/config/v1.rb b/lib/vagrant/config/v1.rb
index bf8936a9d..706e41ec8 100644
--- a/lib/vagrant/config/v1.rb
+++ b/lib/vagrant/config/v1.rb
@@ -1,6 +1,7 @@
 module Vagrant
   module Config
     module V1
+      autoload :DummyConfig, "vagrant/config/v1/dummy_config"
       autoload :Loader, "vagrant/config/v1/loader"
       autoload :Root,   "vagrant/config/v1/root"
     end
diff --git a/lib/vagrant/config/v1/dummy_config.rb b/lib/vagrant/config/v1/dummy_config.rb
new file mode 100644
index 000000000..dc678a33d
--- /dev/null
+++ b/lib/vagrant/config/v1/dummy_config.rb
@@ -0,0 +1,13 @@
+module Vagrant
+  module Config
+    module V1
+      # This is a configuration object that can have anything done
+      # to it. Anything, and it just appears to keep working.
+      class DummyConfig
+        def method_missing(name, *args, &block)
+          DummyConfig.new
+        end
+      end
+    end
+  end
+end
diff --git a/lib/vagrant/config/v1/root.rb b/lib/vagrant/config/v1/root.rb
index ba3288095..1f7db9763 100644
--- a/lib/vagrant/config/v1/root.rb
+++ b/lib/vagrant/config/v1/root.rb
@@ -1,4 +1,3 @@
-require "ostruct"
 require "set"
 
 module Vagrant
@@ -31,7 +30,7 @@ module Vagrant
           else
             # Record access to a missing key as an error
             @missing_key_calls.add(name.to_s)
-            return OpenStruct.new
+            return DummyConfig.new
           end
         end
 
diff --git a/test/unit/vagrant/config/v1/dummy_config_test.rb b/test/unit/vagrant/config/v1/dummy_config_test.rb
new file mode 100644
index 000000000..22a99a97b
--- /dev/null
+++ b/test/unit/vagrant/config/v1/dummy_config_test.rb
@@ -0,0 +1,24 @@
+require File.expand_path("../../../../base", __FILE__)
+
+describe Vagrant::Config::V1::DummyConfig do
+  it "should allow attribute setting" do
+    expect { subject.foo = :bar }.
+      to_not raise_error
+  end
+
+  it "should allow method calls that return more DummyConfigs" do
+    subject.foo.should be_kind_of(described_class)
+  end
+
+  it "should allow hash access" do
+    expect { subject[:foo] }.
+      to_not raise_error
+
+    subject[:foo].should be_kind_of(described_class)
+  end
+
+  it "should allow setting hash values" do
+    expect { subject[:foo] = :bar }.
+      to_not raise_error
+  end
+end