add code to implement node path tracking

via node.__path variable

using __underscore format because node["path"] could very
well be used and we still have to deal with node.path method_missing
horribleness.

Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/chef/node/mixin/immutablize_hash.rb b/lib/chef/node/mixin/immutablize_hash.rb
new file mode 100644
index 0000000000..f09e6944fc
--- /dev/null
+++ b/lib/chef/node/mixin/immutablize_hash.rb
@@ -0,0 +1,54 @@
+#--
+# Copyright:: Copyright 2016, Chef Software, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+class Chef
+  class Node
+    module Mixin
+      module ImmutablizeHash
+        DISALLOWED_MUTATOR_METHODS = [
+          :[]=,
+          :clear,
+          :collect!,
+          :default=,
+          :default_proc=,
+          :delete,
+          :delete_if,
+          :keep_if,
+          :map!,
+          :merge!,
+          :update,
+          :reject!,
+          :replace,
+          :select!,
+          :shift,
+          :write,
+          :write!,
+          :unlink,
+          :unlink!,
+        ]
+
+        # Redefine all of the methods that mutate a Hash to raise an error when called.
+        # This is the magic that makes this object "Immutable"
+        DISALLOWED_MUTATOR_METHODS.each do |mutator_method_name|
+          define_method(mutator_method_name) do |*args, &block|
+            raise Exceptions::ImmutableAttributeModification
+          end
+        end
+      end
+    end
+  end
+end