Attributes v1.1 changeslcg/attributes-v1.1

- fixes *_unless behavior and set_unless_value_present hack from Chef 12
- simplifies rm_* code
- introduces functional read/write/unlink/exist? API
- deprecates method_missing access to attributes for Chef 13
- deprecates set/set_unless aliases for Chef 14
- removes MultiMash mess that I wrote for Chef 13

https://github.com/chef/chef/pull/5029 for more details

31 files changed, 852 insertions, 315 deletions

diff --git a/lib/chef/decorator/unchain.rb b/lib/chef/decorator/unchain.rb
new file mode 100644
index 0000000000..30179d4e63
--- /dev/null
+++ b/lib/chef/decorator/unchain.rb
@@ -0,0 +1,43 @@
+class Chef
+  class Decorator < SimpleDelegator
+    #
+    # This decorator unchains method call chains and turns them into method calls
+    # with variable args.  So this:
+    #
+    #   node.set_unless["foo"]["bar"] = "baz"
+    #
+    # Can become:
+    #
+    #   node.set_unless("foo", "bar", "baz")
+    #
+    # While this is a decorator it is not a Decorator and does not inherit because
+    # it deliberately does not need or want the method_missing magic.  It is not legal
+    # to call anything on the intermediate values and only supports method chaining with
+    # #[] until the chain comes to an end with #[]=, so does not behave like a hash or
+    # array...  e.g.
+    #
+    #   node.default['foo'].keys is legal
+    #   node.set_unless['foo'].keys is not legal now or ever
+    #
+    class Unchain
+      attr_accessor :__path__
+      attr_accessor :__method__
+
+      def initialize(obj, method)
+        @__path__        = []
+        @__method__      = method
+        @delegate_sd_obj = obj
+      end
+
+      def [](key)
+        __path__.push(key)
+        self
+      end
+
+      def []=(key, value)
+        __path__.push(key)
+        @delegate_sd_obj.public_send(__method__, *__path__, value)
+      end
+    end
+  end
+end
diff --git a/lib/chef/exceptions.rb b/lib/chef/exceptions.rb
index ea90d80cd8..43759568a7 100644
--- a/lib/chef/exceptions.rb
+++ b/lib/chef/exceptions.rb
@@ -106,7 +106,12 @@ class Chef
     # for back compat, need to raise an error that inherits from ArgumentError
     class CookbookNotFoundInRepo < ArgumentError; end
     class RecipeNotFound < ArgumentError; end
+    # AttributeNotFound really means the attribute file could not be found
     class AttributeNotFound < RuntimeError; end
+    # NoSuchAttribute is raised on access by node.read!("foo", "bar") when node["foo"]["bar"] does not exist.
+    class NoSuchAttribute < RuntimeError; end
+    # AttributeTypeMismatch is raised by node.write!("foo", "bar", "baz") when e.g. node["foo"] = "bar" (overwriting String with Hash)
+    class AttributeTypeMismatch < RuntimeError; end
     class MissingCookbookDependency < StandardError; end # CHEF-5120
     class InvalidCommandOption < RuntimeError; end
     class CommandTimeout < RuntimeError; end
diff --git a/lib/chef/node.rb b/lib/chef/node.rb
index 8d77becbf0..54faab6d3e 100644
--- a/lib/chef/node.rb
+++ b/lib/chef/node.rb
@@ -43,6 +43,8 @@ class Chef
     def_delegators :attributes, :keys, :each_key, :each_value, :key?, :has_key?
     def_delegators :attributes, :rm, :rm_default, :rm_normal, :rm_override
     def_delegators :attributes, :default!, :normal!, :override!, :force_default!, :force_override!
+    def_delegators :attributes, :default_unless, :normal_unless, :override_unless, :set_unless
+    def_delegators :attributes, :read, :read!, :write, :write!, :unlink, :unlink!
 
     attr_accessor :recipe_list, :run_state, :override_runlist
 
@@ -196,35 +198,18 @@ class Chef
     # might be missing
     def normal
       attributes.top_level_breadcrumb = nil
-      attributes.set_unless_value_present = false
       attributes.normal
     end
 
-    alias_method :set, :normal
-
-    # Set a normal attribute of this node, auto-vivifying any mashes that are
-    # missing, but if the final value already exists, don't set it
-    def normal_unless
-      attributes.top_level_breadcrumb = nil
-      attributes.set_unless_value_present = true
-      attributes.normal
+    def set
+      Chef.log_deprecation("node.set is deprecated and will be removed in Chef 14, please use node.default/node.override (or node.normal only if you really need persistence)")
+      normal
     end
 
-    alias_method :set_unless, :normal_unless
-
     # Set a default of this node, but auto-vivify any Mashes that might
     # be missing
     def default
       attributes.top_level_breadcrumb = nil
-      attributes.set_unless_value_present = false
-      attributes.default
-    end
-
-    # Set a default attribute of this node, auto-vivifying any mashes that are
-    # missing, but if the final value already exists, don't set it
-    def default_unless
-      attributes.top_level_breadcrumb = nil
-      attributes.set_unless_value_present = true
       attributes.default
     end
 
@@ -232,15 +217,6 @@ class Chef
     # might be missing
     def override
       attributes.top_level_breadcrumb = nil
-      attributes.set_unless_value_present = false
-      attributes.override
-    end
-
-    # Set an override attribute of this node, auto-vivifying any mashes that
-    # are missing, but if the final value already exists, don't set it
-    def override_unless
-      attributes.top_level_breadcrumb = nil
-      attributes.set_unless_value_present = true
       attributes.override
     end
 
@@ -262,7 +238,6 @@ class Chef
 
     def automatic_attrs
       attributes.top_level_breadcrumb = nil
-      attributes.set_unless_value_present = false
       attributes.automatic
     end
 
@@ -290,8 +265,14 @@ class Chef
     end
 
     # Only works for attribute fetches, setting is no longer supported
-    def method_missing(symbol, *args)
-      attributes.send(symbol, *args)
+    # XXX: this should be deprecated
+    def method_missing(method, *args, &block)
+      attributes.public_send(method, *args, &block)
+    end
+
+    # Fix respond_to + method so that it works with method_missing delegation
+    def respond_to_missing?(method, include_private = false)
+      attributes.respond_to?(method, false)
     end
 
     # Returns true if this Node expects a given recipe, false if not.
diff --git a/lib/chef/node/attribute.rb b/lib/chef/node/attribute.rb
index ab97cf99bf..09c78c6de6 100644
--- a/lib/chef/node/attribute.rb
+++ b/lib/chef/node/attribute.rb
@@ -19,6 +19,7 @@
 
 require "chef/node/immutable_collections"
 require "chef/node/attribute_collections"
+require "chef/decorator/unchain"
 require "chef/mixin/deep_merge"
 require "chef/log"
 
@@ -132,6 +133,7 @@ class Chef
        :take,
        :take_while,
        :to_a,
+       :to_h,
        :to_hash,
        :to_set,
        :value?,
@@ -187,8 +189,6 @@ class Chef
       attr_accessor :deep_merge_cache
 
       def initialize(normal, default, override, automatic)
-        @set_unless_present = false
-
         @default = VividMash.new(self, default)
         @env_default = VividMash.new(self, {})
         @role_default = VividMash.new(self, {})
@@ -214,15 +214,13 @@ class Chef
        # attribute you're interested in. For example, to debug where the value
        # of `node[:network][:default_interface]` is coming from, use:
        #   debug_value(:network, :default_interface).
-       # The return value is an Array of Arrays. The first element is
-       # `["set_unless_enabled?", Boolean]`, which describes whether the
-       # attribute collection is in "set_unless" mode. The rest of the Arrays
+       # The return value is an Array of Arrays.  The Arrays
        # are pairs of `["precedence_level", value]`, where precedence level is
        # the component, such as role default, normal, etc. and value is the
        # attribute value set at that precedence level. If there is no value at
        # that precedence level, +value+ will be the symbol +:not_present+.
       def debug_value(*args)
-        components = COMPONENTS.map do |component|
+        COMPONENTS.map do |component|
           ivar = instance_variable_get(component)
           value = args.inject(ivar) do |so_far, key|
             if so_far == :not_present
@@ -235,12 +233,6 @@ class Chef
           end
           [component.to_s.sub(/^@/, ""), value]
         end
-        [["set_unless_enabled?", @set_unless_present]] + components
-      end
-
-       # Enables or disables `||=`-like attribute setting. See, e.g., Node#set_unless
-      def set_unless_value_present=(setting)
-        @set_unless_present = setting
       end
 
        # Invalidate a key in the deep_merge_cache.  If called with nil, or no arg, this will invalidate
@@ -321,94 +313,134 @@ class Chef
 
        # clears attributes from all precedence levels
       def rm(*args)
-        reset(args[0])
-        # just easier to compute our retval, rather than collect+merge sub-retvals
-        ret = args.inject(merged_attributes) do |attr, arg|
-          if attr.nil? || !attr.respond_to?(:[])
-            nil
-          else
-            begin
-              attr[arg]
-            rescue TypeError
-              raise TypeError, "Wrong type in index of attribute (did you use a Hash index on an Array?)"
-            end
-          end
+        with_deep_merged_return_value(self, *args) do
+          rm_default(*args)
+          rm_normal(*args)
+          rm_override(*args)
         end
-        rm_default(*args)
-        rm_normal(*args)
-        rm_override(*args)
-        ret
       end
 
-       # does <level>['foo']['bar'].delete('baz')
-      def remove_from_precedence_level(level, *args, key)
-        multimash = level.element(*args)
-        multimash.nil? ? nil : multimash.delete(key)
-      end
-
-      private :remove_from_precedence_level
-
        # clears attributes from all default precedence levels
        #
-       # equivalent to: force_default!['foo']['bar'].delete('baz')
+       # similar to: force_default!['foo']['bar'].delete('baz')
+       # - does not autovivify
+       # - does not trainwreck if interior keys do not exist
       def rm_default(*args)
-        reset(args[0])
-        remove_from_precedence_level(force_default!(autovivify: false), *args)
+        with_deep_merged_return_value(combined_default, *args) do
+          default.unlink(*args)
+          role_default.unlink(*args)
+          env_default.unlink(*args)
+          force_default.unlink(*args)
+        end
       end
 
        # clears attributes from normal precedence
        #
        # equivalent to: normal!['foo']['bar'].delete('baz')
+       # - does not autovivify
+       # - does not trainwreck if interior keys do not exist
       def rm_normal(*args)
-        reset(args[0])
-        remove_from_precedence_level(normal!(autovivify: false), *args)
+        normal.unlink(*args)
       end
 
        # clears attributes from all override precedence levels
        #
        # equivalent to: force_override!['foo']['bar'].delete('baz')
+       # - does not autovivify
+       # - does not trainwreck if interior keys do not exist
       def rm_override(*args)
-        reset(args[0])
-        remove_from_precedence_level(force_override!(autovivify: false), *args)
+        with_deep_merged_return_value(combined_override, *args) do
+          override.unlink(*args)
+          role_override.unlink(*args)
+          env_override.unlink(*args)
+          force_override.unlink(*args)
+        end
+      end
+
+      def with_deep_merged_return_value(obj, *path, last)
+        hash = obj.read(*path)
+        return nil unless hash.is_a?(Hash)
+        ret = hash[last]
+        yield
+        ret
       end
 
+      private :with_deep_merged_return_value
+
        #
        # Replacing attributes without merging
        #
 
        # sets default attributes without merging
-      def default!(opts = {})
-        # FIXME: do not flush whole cache
-        reset
-        MultiMash.new(self, @default, [], opts)
+       #
+       # - this API autovivifies (and cannot trainwreck)
+      def default!(*args)
+        return Decorator::Unchain.new(self, :default!) unless args.length > 0
+        write(:default, *args)
       end
 
        # sets normal attributes without merging
-      def normal!(opts = {})
-        # FIXME: do not flush whole cache
-        reset
-        MultiMash.new(self, @normal, [], opts)
+       #
+       # - this API autovivifies (and cannot trainwreck)
+      def normal!(*args)
+        return Decorator::Unchain.new(self, :normal!) unless args.length > 0
+        write(:normal, *args)
       end
 
        # sets override attributes without merging
-      def override!(opts = {})
-        # FIXME: do not flush whole cache
-        reset
-        MultiMash.new(self, @override, [], opts)
+       #
+       # - this API autovivifies (and cannot trainwreck)
+      def override!(*args)
+        return Decorator::Unchain.new(self, :override!) unless args.length > 0
+        write(:override, *args)
       end
 
        # clears from all default precedence levels and then sets force_default
-      def force_default!(opts = {})
-        # FIXME: do not flush whole cache
-        reset
-        MultiMash.new(self, @force_default, [@default, @env_default, @role_default], opts)
+       #
+       # - this API autovivifies (and cannot trainwreck)
+      def force_default!(*args)
+        return Decorator::Unchain.new(self, :force_default!) unless args.length > 0
+        value = args.pop
+        rm_default(*args)
+        write(:force_default, *args, value)
       end
 
        # clears from all override precedence levels and then sets force_override
-      def force_override!(opts = {})
-        # FIXME: do not flush whole cache
-        reset
-        MultiMash.new(self, @force_override, [@override, @env_override, @role_override], opts)
+      def force_override!(*args)
+        return Decorator::Unchain.new(self, :force_override!) unless args.length > 0
+        value = args.pop
+        rm_override(*args)
+        write(:force_override, *args, value)
+      end
+
+      # method-style access to attributes
+
+      def read(*path)
+        merged_attributes.read(*path)
+      end
+
+      def read!(*path)
+        merged_attributes.read!(*path)
+      end
+
+      def exist?(*path)
+        merged_attributes.exist?(*path)
+      end
+
+      def write(level, *args, &block)
+        self.send(level).write(*args, &block)
+      end
+
+      def write!(level, *args, &block)
+        self.send(level).write!(*args, &block)
+      end
+
+      def unlink(level, *path)
+        self.send(level).unlink(*path)
+      end
+
+      def unlink!(level, *path)
+        self.send(level).unlink!(*path)
       end
 
        #
@@ -420,9 +452,9 @@ class Chef
        #
 
       def merged_attributes(*path)
-       # immutablize(
+        # immutablize(
         merge_all(path)
-       # )
+        # )
       end
 
       def combined_override(*path)
@@ -433,6 +465,27 @@ class Chef
         immutablize(merge_defaults(path))
       end
 
+      def normal_unless(*args)
+        return Decorator::Unchain.new(self, :normal_unless) unless args.length > 0
+        write(:normal, *args) if read(*args[0...-1]).nil?
+      end
+
+      def default_unless(*args)
+        return Decorator::Unchain.new(self, :default_unless) unless args.length > 0
+        write(:default, *args) if read(*args[0...-1]).nil?
+      end
+
+      def override_unless(*args)
+        return Decorator::Unchain.new(self, :override_unless) unless args.length > 0
+        write(:override, *args) if read(*args[0...-1]).nil?
+      end
+
+      def set_unless(*args)
+        Chef.log_deprecation("node.set_unless is deprecated and will be removed in Chef 14, please use node.default_unless/node.override_unless (or node.normal_unless if you really need persistence)")
+        return Decorator::Unchain.new(self, :default_unless) unless args.length > 0
+        write(:normal, *args) if read(*args[0...-1]).nil?
+      end
+
       def [](key)
         if deep_merge_cache.has_key?(key.to_s)
           # return the cache of the deep merged values by top-level key
@@ -461,13 +514,17 @@ class Chef
       alias :each_attribute :each
 
       def method_missing(symbol, *args)
-        if args.empty?
+        if symbol == :to_ary
+          merged_attributes.send(symbol, *args)
+        elsif args.empty?
+          Chef.log_deprecation %q{"method access to node attributes (node.foo.bar) is deprecated and will be removed in Chef 13, please use bracket syntax (node["foo"]["bar"])}
           if key?(symbol)
             self[symbol]
           else
             raise NoMethodError, "Undefined method or attribute `#{symbol}' on `node'"
           end
         elsif symbol.to_s =~ /=$/
+          Chef.log_deprecation %q{"method setting of node attributes (node.foo="bar") is deprecated and will be removed in Chef 13, please use bracket syntax (node["foo"]="bar")}
           key_to_set = symbol.to_s[/^(.+)=$/, 1]
           self[key_to_set] = (args.length == 1 ? args[0] : args)
         else
@@ -485,10 +542,6 @@ class Chef
         }.join(", ") << ">"
       end
 
-      def set_unless?
-        @set_unless_present
-      end
-
        private
 
        # Helper method for merge_all/merge_defaults/merge_overrides.
diff --git a/lib/chef/node/attribute_collections.rb b/lib/chef/node/attribute_collections.rb
index 68f3a69756..b739ea8490 100644
--- a/lib/chef/node/attribute_collections.rb
+++ b/lib/chef/node/attribute_collections.rb
@@ -16,15 +16,15 @@
 # limitations under the License.
 #
 
+require "chef/node/common_api"
+
 class Chef
   class Node
-
     # == AttrArray
     # AttrArray is identical to Array, except that it keeps a reference to the
     # "root" (Chef::Node::Attribute) object, and will trigger a cache
     # invalidation on that object when mutated.
     class AttrArray < Array
-
       MUTATOR_METHODS = [
         :<<,
         :[]=,
@@ -62,8 +62,9 @@ class Chef
       # Node::Attribute object.
       MUTATOR_METHODS.each do |mutator|
         define_method(mutator) do |*args, &block|
+          ret = super(*args, &block)
           root.reset_cache(root.top_level_breadcrumb)
-          super(*args, &block)
+          ret
         end
       end
 
@@ -96,14 +97,12 @@ class Chef
     #   in the creation of a new VividMash for that key. (This only works when
     #   using the element reference method, `[]` -- other methods, such as
     #   #fetch, work as normal).
-    # * It supports a set_unless flag (via the root Attribute object) which
-    #   allows `||=` style behavior (`||=` does not work with
-    #   auto-vivification). This is only implemented for #[]=; methods such as
-    #   #store work as normal.
     # * attr_accessor style element set and get are supported via method_missing
     class VividMash < Mash
       attr_reader :root
 
+      include CommonAPI
+
       # Methods that mutate a VividMash. Each of them is overridden so that it
       # also invalidates the cached merged_attributes on the root Attribute
       # object.
@@ -148,12 +147,9 @@ class Chef
 
       def []=(key, value)
         root.top_level_breadcrumb ||= key
-        if set_unless? && key?(key) && !self[key].nil?
-          self[key]
-        else
-          root.reset_cache(root.top_level_breadcrumb)
-          super
-        end
+        ret = super
+        root.reset_cache(root.top_level_breadcrumb)
+        ret
       end
 
       alias :attribute? :has_key?
@@ -176,10 +172,6 @@ class Chef
         end
       end
 
-      def set_unless?
-        @root.set_unless?
-      end
-
       def convert_key(key)
         super
       end
@@ -206,118 +198,5 @@ class Chef
       end
 
     end
-
-    # == MultiMash
-    # This is a Hash-like object that contains multiple VividMashes in it.  Its
-    # purpose is so that the user can descend into the mash and delete a subtree
-    # from all of the Mash objects (used to delete all values in a subtree from
-    # default, force_default, role_default and env_default at the same time).  The
-    # assignment operator strictly does assignment (does no merging) and works
-    # by deleting the subtree and then assigning to the last mash which passed in
-    # the initializer.
-    #
-    # A lot of the complexity of this class comes from the fact that at any key
-    # value some or all of the mashes may walk off their ends and become nil or
-    # true or something.  The schema may change so that one precidence leve may
-    # be 'true' object and another may be a VividMash.  It is also possible that
-    # one or many of them may transition from VividMashes to Hashes or Arrays.
-    #
-    # It also supports the case where you may be deleting a key using node.rm
-    # in which case if intermediate keys all walk off into nil then you don't want
-    # to be autovivifying keys as you go.  On the other hand you may be using
-    # node.force_default! in which case you'll wind up with a []= operator at the
-    # end and you want autovivification, so we conditionally have to support either
-    # operation.
-    #
-    # @todo: can we have an autovivify class that decorates a class that doesn't
-    # autovivify or something so that the code is less awful?
-    #
-    class MultiMash
-      attr_reader :root
-      attr_reader :mashes
-      attr_reader :opts
-      attr_reader :primary_mash
-
-      # Initialize with an array of mashes.  For the delete return value to work
-      # properly the mashes must come from the same attribute level (i.e. all
-      # override or all default, but not a mix of both).
-      def initialize(root, primary_mash, mashes, opts = {})
-        @root = root
-        @primary_mash = primary_mash
-        @mashes = mashes
-        @opts = opts
-        @opts[:autovivify] = true if @opts[:autovivify].nil?
-      end
-
-      def [](key)
-        # handle the secondary mashes
-        new_mashes = []
-        mashes.each do |mash|
-          new_mash = safe_evalute_key(mash, key)
-          # secondary mashes never autovivify so once they fall into nil, we just stop tracking them
-          new_mashes.push(new_mash) unless new_mash.nil?
-        end
-
-        new_primary_mash = safe_evalute_key(primary_mash, key)
-
-        if new_primary_mash.nil? && @opts[:autovivify]
-          primary_mash[key] = VividMash.new(root)
-          new_primary_mash = primary_mash[key]
-        end
-
-        MultiMash.new(root, new_primary_mash, new_mashes, opts)
-      end
-
-      def []=(key, value)
-        if primary_mash.nil?
-          # This theoretically should never happen since node#force_default! setter methods will autovivify and
-          # node#rm methods do not end in #[]= operators.
-          raise TypeError, "No autovivification was specified initially on a method chain ending in assignment"
-        end
-        ret = delete(key)
-        primary_mash[key] = value
-        ret
-      end
-
-      # mash.element('foo', 'bar') is the same as mash['foo']['bar']
-      def element(key = nil, *subkeys)
-        return self if key.nil?
-        submash = self[key]
-        subkeys.empty? ? submash : submash.element(*subkeys)
-      end
-
-      def delete(key)
-        # the return value is a deep merge which is correct semantics when
-        # merging between attributes on the same level (this would be incorrect
-        # if passed both override and default attributes which would need hash_only
-        # merging).
-        ret = mashes.inject(Mash.new) do |merged, mash|
-          Chef::Mixin::DeepMerge.merge(merged, mash)
-        end
-        ret = Chef::Mixin::DeepMerge.merge(ret, primary_mash)
-        mashes.each do |mash|
-          mash.delete(key) if mash.respond_to?(:delete)
-        end
-        primary_mash.delete(key) if primary_mash.respond_to?(:delete)
-        ret[key]
-      end
-
-      private
-
-      def safe_evalute_key(mash, key)
-        if mash.respond_to?(:[])
-          if mash.respond_to?(:has_key?)
-            if mash.has_key?(key)
-              return mash[key] if mash[key].respond_to?(:[])
-            end
-          elsif !mash[key].nil?
-            return mash[key] if mash[key].respond_to?(:[])
-          end
-        end
-        return nil
-      end
-
-    end
-
   end
 end
diff --git a/lib/chef/node/common_api.rb b/lib/chef/node/common_api.rb
new file mode 100644
index 0000000000..6f921e15aa
--- /dev/null
+++ b/lib/chef/node/common_api.rb
@@ -0,0 +1,124 @@
+#--
+# 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
+    # shared API between VividMash and ImmutableMash, writer code can be
+    # 'shared' to keep it logically in this file by adding them to the
+    # block list in ImmutableMash.
+    module CommonAPI
+      # method-style access to attributes
+
+      def valid_container?(obj, key)
+        return obj.is_a?(Hash) || (obj.is_a?(Array) && key.is_a?(Fixnum))
+      end
+
+      private :valid_container?
+
+      # - autovivifying / autoreplacing writer
+      # - non-container-ey intermediate objects are replaced with hashes
+      def write(*args, &block)
+        value = block_given? ? yield : args.pop
+        last = args.pop
+        prev_memo = prev_key = nil
+        chain = args.inject(self) do |memo, key|
+          if !valid_container?(memo, key)
+            prev_memo[prev_key] = {}
+            memo = prev_memo[prev_key]
+          end
+          prev_memo = memo
+          prev_key = key
+          memo[key]
+        end
+        if !valid_container?(chain, last)
+          prev_memo[prev_key] = {}
+          chain = prev_memo[prev_key]
+        end
+        chain[last] = value
+      end
+
+      # this autovivifies, but can throw NoSuchAttribute when trying to access #[] on
+      # something that is not a container ("schema violation" issues).
+      #
+      def write!(*args, &block)
+        value = block_given? ? yield : args.pop
+        last = args.pop
+        obj = args.inject(self) do |memo, key|
+          raise Chef::Exceptions::AttributeTypeMismatch unless valid_container?(memo, key)
+          memo[key]
+        end
+        raise Chef::Exceptions::AttributeTypeMismatch unless valid_container?(obj, last)
+        obj[last] = value
+      end
+
+      # FIXME:(?) does anyone need a non-autovivifying writer for attributes that throws exceptions?
+
+      # return true or false based on if the attribute exists
+      def exist?(*path)
+        path.inject(self) do |memo, key|
+          return false unless valid_container?(memo, key)
+          if memo.is_a?(Hash)
+            if memo.key?(key)
+              memo[key]
+            else
+              return false
+            end
+          elsif memo.is_a?(Array)
+            if memo.length > key
+              memo[key]
+            else
+              return false
+            end
+          end
+        end
+        return true
+      end
+
+      # this is a safe non-autovivifying reader that returns nil if the attribute does not exist
+      def read(*path)
+        begin
+          read!(*path)
+        rescue Chef::Exceptions::NoSuchAttribute
+          nil
+        end
+      end
+
+      # non-autovivifying reader that throws an exception if the attribute does not exist
+      def read!(*path)
+        raise Chef::Exceptions::NoSuchAttribute unless exist?(*path)
+        path.inject(self) do |memo, key|
+          memo[key]
+        end
+      end
+
+      # FIXME:(?) does anyone really like the autovivifying reader that we have and wants the same behavior?  readers that write?  ugh...
+
+      def unlink(*path, last)
+        hash = path.empty? ? self : read(*path)
+        return nil unless hash.is_a?(Hash) || hash.is_a?(Array)
+        root.top_level_breadcrumb ||= last
+        hash.delete(last)
+      end
+
+      def unlink!(*path)
+        raise Chef::Exceptions::NoSuchAttribute unless exist?(*path)
+        unlink(*path)
+      end
+
+    end
+  end
+end
diff --git a/lib/chef/node/immutable_collections.rb b/lib/chef/node/immutable_collections.rb
index b5fd86fa72..d4623ace2a 100644
--- a/lib/chef/node/immutable_collections.rb
+++ b/lib/chef/node/immutable_collections.rb
@@ -1,3 +1,21 @@
+#--
+# Copyright:: Copyright 2012-2016, 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.
+#
+
+require "chef/node/common_api"
 
 class Chef
   class Node
@@ -124,6 +142,7 @@ class Chef
     class ImmutableMash < Mash
 
       include Immutablize
+      include CommonAPI
 
       alias :internal_set :[]=
       private :internal_set
@@ -144,6 +163,10 @@ class Chef
         :replace,
         :select!,
         :shift,
+        :write,
+        :write!,
+        :unlink,
+        :unlink!,
       ]
 
       def initialize(mash_data)
@@ -167,13 +190,15 @@ class Chef
       end
 
       def method_missing(symbol, *args)
-        if args.empty?
+        if symbol == :to_ary
+          super
+        elsif args.empty?
           if key?(symbol)
             self[symbol]
           else
             raise NoMethodError, "Undefined method or attribute `#{symbol}' on `node'"
           end
-        # This will raise a ImmutableAttributeModification error:
+          # This will raise a ImmutableAttributeModification error:
         elsif symbol.to_s =~ /=$/
           key_to_set = symbol.to_s[/^(.+)=$/, 1]
           self[key_to_set] = (args.length == 1 ? args[0] : args)
diff --git a/lib/chef/provider/batch.rb b/lib/chef/provider/batch.rb
index bb294afd3f..0d857aaa79 100644
--- a/lib/chef/provider/batch.rb
+++ b/lib/chef/provider/batch.rb
@@ -29,7 +29,7 @@ class Chef
       end
 
       def command
-        basepath = is_forced_32bit ? wow64_directory : run_context.node.kernel.os_info.system_directory
+        basepath = is_forced_32bit ? wow64_directory : run_context.node["kernel"]["os_info"]["system_directory"]
 
         interpreter_path = Chef::Util::PathHelper.join(basepath, interpreter)
 
diff --git a/lib/chef/provider/package/openbsd.rb b/lib/chef/provider/package/openbsd.rb
index 2120b9aa48..8043c01693 100644
--- a/lib/chef/provider/package/openbsd.rb
+++ b/lib/chef/provider/package/openbsd.rb
@@ -127,7 +127,7 @@ class Chef
         end
 
         def pkg_path
-          ENV["PKG_PATH"] || "http://ftp.OpenBSD.org/pub/#{node.kernel.name}/#{node.kernel.release}/packages/#{node.kernel.machine}/"
+          ENV["PKG_PATH"] || "http://ftp.OpenBSD.org/pub/#{node["kernel"]["name"]}/#{node["kernel"]["release"]}/packages/#{node["kernel"]["machine"]}/"
         end
 
       end
diff --git a/lib/chef/provider/powershell_script.rb b/lib/chef/provider/powershell_script.rb
index 6365f6a171..ab85ec35ac 100644
--- a/lib/chef/provider/powershell_script.rb
+++ b/lib/chef/provider/powershell_script.rb
@@ -36,7 +36,7 @@ class Chef
       end
 
       def command
-        basepath = is_forced_32bit ? wow64_directory : run_context.node.kernel.os_info.system_directory
+        basepath = is_forced_32bit ? wow64_directory : run_context.node["kernel"]["os_info"]["system_directory"]
 
         # Powershell.exe is always in "v1.0" folder (for backwards compatibility)
         interpreter_path = Chef::Util::PathHelper.join(basepath, "WindowsPowerShell", "v1.0", interpreter)
diff --git a/lib/chef/shell.rb b/lib/chef/shell.rb
index aad5c49d00..26683cc25d 100644
--- a/lib/chef/shell.rb
+++ b/lib/chef/shell.rb
@@ -148,7 +148,7 @@ module Shell
   end
 
   def self.greeting
-    " #{Etc.getlogin}@#{Shell.session.node.fqdn}"
+    " #{Etc.getlogin}@#{Shell.session.node["fqdn"]}"
   rescue NameError, ArgumentError
     ""
   end
diff --git a/spec/data/run_context/cookbooks/circular-dep1/attributes/default.rb b/spec/data/run_context/cookbooks/circular-dep1/attributes/default.rb
index ef0967a4d2..e45e7d9f68 100644
--- a/spec/data/run_context/cookbooks/circular-dep1/attributes/default.rb
+++ b/spec/data/run_context/cookbooks/circular-dep1/attributes/default.rb
@@ -1,4 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "circular-dep1::default"
-
-
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "circular-dep1::default"
diff --git a/spec/data/run_context/cookbooks/circular-dep2/attributes/default.rb b/spec/data/run_context/cookbooks/circular-dep2/attributes/default.rb
index f2ef012aa1..37f396b1f9 100644
--- a/spec/data/run_context/cookbooks/circular-dep2/attributes/default.rb
+++ b/spec/data/run_context/cookbooks/circular-dep2/attributes/default.rb
@@ -1,3 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "circular-dep2::default"
-
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "circular-dep2::default"
diff --git a/spec/data/run_context/cookbooks/dependency1/attributes/aa_first.rb b/spec/data/run_context/cookbooks/dependency1/attributes/aa_first.rb
index e818d36a9e..3059494198 100644
--- a/spec/data/run_context/cookbooks/dependency1/attributes/aa_first.rb
+++ b/spec/data/run_context/cookbooks/dependency1/attributes/aa_first.rb
@@ -1,2 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "dependency1::aa_first"
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "dependency1::aa_first"
diff --git a/spec/data/run_context/cookbooks/dependency1/attributes/default.rb b/spec/data/run_context/cookbooks/dependency1/attributes/default.rb
index 6875274e3f..a65a3345bc 100644
--- a/spec/data/run_context/cookbooks/dependency1/attributes/default.rb
+++ b/spec/data/run_context/cookbooks/dependency1/attributes/default.rb
@@ -1,2 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "dependency1::default"
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "dependency1::default"
diff --git a/spec/data/run_context/cookbooks/dependency1/attributes/zz_last.rb b/spec/data/run_context/cookbooks/dependency1/attributes/zz_last.rb
index 1a513b03d4..94ffb30133 100644
--- a/spec/data/run_context/cookbooks/dependency1/attributes/zz_last.rb
+++ b/spec/data/run_context/cookbooks/dependency1/attributes/zz_last.rb
@@ -1,3 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "dependency1::zz_last"
-
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "dependency1::zz_last"
diff --git a/spec/data/run_context/cookbooks/dependency2/attributes/default.rb b/spec/data/run_context/cookbooks/dependency2/attributes/default.rb
index 526751f422..8917bf9730 100644
--- a/spec/data/run_context/cookbooks/dependency2/attributes/default.rb
+++ b/spec/data/run_context/cookbooks/dependency2/attributes/default.rb
@@ -1,3 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "dependency2::default"
-
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "dependency2::default"
diff --git a/spec/data/run_context/cookbooks/no-default-attr/attributes/server.rb b/spec/data/run_context/cookbooks/no-default-attr/attributes/server.rb
index 3ad2b925aa..07294665b2 100644
--- a/spec/data/run_context/cookbooks/no-default-attr/attributes/server.rb
+++ b/spec/data/run_context/cookbooks/no-default-attr/attributes/server.rb
@@ -1,3 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "no-default-attr::server"
-
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "no-default-attr::server"
diff --git a/spec/data/run_context/cookbooks/test-with-circular-deps/attributes/default.rb b/spec/data/run_context/cookbooks/test-with-circular-deps/attributes/default.rb
index cca56bc61f..77309462b1 100644
--- a/spec/data/run_context/cookbooks/test-with-circular-deps/attributes/default.rb
+++ b/spec/data/run_context/cookbooks/test-with-circular-deps/attributes/default.rb
@@ -1,3 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "test-with-circular-deps::default"
-
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "test-with-circular-deps::default"
diff --git a/spec/data/run_context/cookbooks/test-with-deps/attributes/default.rb b/spec/data/run_context/cookbooks/test-with-deps/attributes/default.rb
index 4d71cc3cfe..c4cc8151a4 100644
--- a/spec/data/run_context/cookbooks/test-with-deps/attributes/default.rb
+++ b/spec/data/run_context/cookbooks/test-with-deps/attributes/default.rb
@@ -1,3 +1,2 @@
-set_unless[:attr_load_order] = []
-set[:attr_load_order] << "test-with-deps::default"
-
+normal_unless[:attr_load_order] = []
+normal[:attr_load_order] << "test-with-deps::default"
diff --git a/spec/functional/resource/package_spec.rb b/spec/functional/resource/package_spec.rb
index 6dc55f7f01..0f01a751ec 100644
--- a/spec/functional/resource/package_spec.rb
+++ b/spec/functional/resource/package_spec.rb
@@ -260,7 +260,7 @@ describe Chef::Resource::Package, metadata do
           end
 
           before do
-            node.set[:preseed_value] = "FROM TEMPLATE"
+            node.normal[:preseed_value] = "FROM TEMPLATE"
           end
 
           it "preseeds the package, then installs it" do
diff --git a/spec/functional/resource/template_spec.rb b/spec/functional/resource/template_spec.rb
index f270043f2c..32529fbb0c 100644
--- a/spec/functional/resource/template_spec.rb
+++ b/spec/functional/resource/template_spec.rb
@@ -110,7 +110,7 @@ describe Chef::Resource::Template do
 
     context "using single helper syntax referencing @node" do
       before do
-        node.set[:helper_test_attr] = "value from helper method"
+        node.normal[:helper_test_attr] = "value from helper method"
         resource.helper(:helper_method) { "#{@node[:helper_test_attr]}" }
       end
 
@@ -131,7 +131,7 @@ describe Chef::Resource::Template do
 
     context "using an inline block referencing @node" do
       before do
-        node.set[:helper_test_attr] = "value from helper method"
+        node.normal[:helper_test_attr] = "value from helper method"
 
         resource.helpers do
           def helper_method
@@ -168,7 +168,7 @@ describe Chef::Resource::Template do
       end
 
       before do
-        node.set[:helper_test_attr] = "value from helper method"
+        node.normal[:helper_test_attr] = "value from helper method"
 
         resource.helpers(ExampleModuleReferencingATNode)
       end
diff --git a/spec/functional/shell_spec.rb b/spec/functional/shell_spec.rb
index fe2abdb12a..636162fb16 100644
--- a/spec/functional/shell_spec.rb
+++ b/spec/functional/shell_spec.rb
@@ -137,7 +137,7 @@ describe Shell do
 
     it "sets the override_runlist from the command line" do
       output, exitstatus = run_chef_shell_with("-o 'override::foo,override::bar'") do |out, keyboard|
-        show_recipes_code = %q[puts "#{node.recipes.inspect}"]
+        show_recipes_code = %q[puts "#{node["recipes"].inspect}"]
         keyboard.puts(show_recipes_code)
         read_until(out, show_recipes_code)
       end
diff --git a/spec/unit/cookbook_version_spec.rb b/spec/unit/cookbook_version_spec.rb
index 7def2f5749..81ea161bfe 100644
--- a/spec/unit/cookbook_version_spec.rb
+++ b/spec/unit/cookbook_version_spec.rb
@@ -120,8 +120,8 @@ describe Chef::CookbookVersion do
       # Used to test file-specificity related file lookups
       let(:node) do
         Chef::Node.new.tap do |n|
-          n.set[:platform] = "ubuntu"
-          n.set[:platform_version] = "13.04"
+          n.normal[:platform] = "ubuntu"
+          n.normal[:platform_version] = "13.04"
           n.name("testing")
         end
       end
@@ -203,8 +203,8 @@ describe Chef::CookbookVersion do
     # Used to test file-specificity related file lookups
     let(:node) do
       Chef::Node.new.tap do |n|
-        n.set[:platform] = "ubuntu"
-        n.set[:platform_version] = "13.04"
+        n.normal[:platform] = "ubuntu"
+        n.normal[:platform_version] = "13.04"
         n.name("testing")
       end
     end
diff --git a/spec/unit/node/attribute_spec.rb b/spec/unit/node/attribute_spec.rb
index 57ad3c0c25..e40f454c0b 100644
--- a/spec/unit/node/attribute_spec.rb
+++ b/spec/unit/node/attribute_spec.rb
@@ -218,7 +218,7 @@ describe Chef::Node::Attribute do
     end
 
     it "gives the value at each level of precedence for a path spec" do
-      expected = [["set_unless_enabled?", false],
+      expected = [
         %w{default default},
         %w{env_default env_default},
         %w{role_default role_default},
@@ -417,12 +417,6 @@ describe Chef::Node::Attribute do
       expect(@attributes.normal["foo"]["bar"]).to eq(:baz)
     end
 
-    it "should optionally skip setting the value if one already exists" do
-      @attributes.set_unless_value_present = true
-      @attributes.normal["hostname"] = "bar"
-      expect(@attributes["hostname"]).to eq("latte")
-    end
-
     it "does not support ||= when setting" do
       # This is a limitation of auto-vivification.
       # Users who need this behavior can use set_unless and friends
@@ -493,6 +487,7 @@ describe Chef::Node::Attribute do
     end
 
     it "should return true if an attribute exists but is set to nil using dot notation" do
+      Chef::Config[:treat_deprecation_warnings_as_errors] = false
       expect(@attributes.music.deeper.has_key?("gates_of_ishtar")).to eq(true)
     end
 
@@ -533,10 +528,12 @@ describe Chef::Node::Attribute do
 
   describe "method_missing" do
     it "should behave like a [] lookup" do
+      Chef::Config[:treat_deprecation_warnings_as_errors] = false
       expect(@attributes.music.mastodon).to eq("rocks")
     end
 
     it "should allow the last method to set a value if it has an = sign on the end" do
+      Chef::Config[:treat_deprecation_warnings_as_errors] = false
       @attributes.normal.music.mastodon = %w{dream still shining}
       expect(@attributes.normal.music.mastodon).to eq(%w{dream still shining})
     end
@@ -577,7 +574,7 @@ describe Chef::Node::Attribute do
 
     it "should yield lower if we go deeper" do
       collect = Array.new
-      @attributes.one.keys.each do |k|
+      @attributes["one"].keys.each do |k|
         collect << k
       end
       expect(collect.include?("two")).to eq(true)
@@ -587,7 +584,7 @@ describe Chef::Node::Attribute do
     end
 
     it "should not raise an exception if one of the hashes has a nil value on a deep lookup" do
-      expect { @attributes.place.keys { |k| } }.not_to raise_error
+      expect { @attributes["place"].keys { |k| } }.not_to raise_error
     end
   end
 
@@ -1171,6 +1168,7 @@ describe Chef::Node::Attribute do
     end
 
     it "raises an error when using `attr=value`" do
+      Chef::Config[:treat_deprecation_warnings_as_errors] = false
       expect { @attributes.new_key = "new value" }.to raise_error(Chef::Exceptions::ImmutableAttributeModification)
     end
 
diff --git a/spec/unit/node/immutable_collections_spec.rb b/spec/unit/node/immutable_collections_spec.rb
index f57ed459cd..fe4e50d1bd 100644
--- a/spec/unit/node/immutable_collections_spec.rb
+++ b/spec/unit/node/immutable_collections_spec.rb
@@ -95,6 +95,10 @@ describe Chef::Node::ImmutableMash do
     :replace,
     :select!,
     :shift,
+    :write,
+    :write!,
+    :unlink,
+    :unlink!,
   ].each do |mutator|
     it "doesn't allow mutation via `#{mutator}'" do
       expect { @immutable_mash.send(mutator) }.to raise_error(Chef::Exceptions::ImmutableAttributeModification)
diff --git a/spec/unit/node/vivid_mash_spec.rb b/spec/unit/node/vivid_mash_spec.rb
new file mode 100644
index 0000000000..ca5eddce57
--- /dev/null
+++ b/spec/unit/node/vivid_mash_spec.rb
@@ -0,0 +1,344 @@
+#
+# 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.
+#
+
+require "spec_helper"
+require "chef/node/attribute_collections"
+
+describe Chef::Node::VividMash do
+  class Root
+    attr_accessor :top_level_breadcrumb
+  end
+
+  let(:root) { Root.new }
+
+  let(:vivid) do
+    expect(root).to receive(:reset_cache).at_least(:once).with(nil)
+    Chef::Node::VividMash.new(root,
+      { "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil }
+    )
+  end
+
+  context "#read" do
+    before do
+      # vivify the vividmash, then we're read-only so the cache should never be cleared afterwards
+      vivid
+      expect(root).not_to receive(:reset_cache)
+    end
+
+    it "reads hashes deeply" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect(vivid.read("one", "two", "three")).to eql("four")
+    end
+
+    it "does not trainwreck when hitting hash keys that do not exist" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect(vivid.read("one", "five", "six")).to eql(nil)
+    end
+
+    it "does not trainwreck when hitting an array with an out of bounds index" do
+      expect(root).to receive(:top_level_breadcrumb=).with("array").and_call_original
+      expect(vivid.read("array", 5, "one")).to eql(nil)
+    end
+
+    it "does not trainwreck when hitting an array with a string key" do
+      expect(root).to receive(:top_level_breadcrumb=).with("array").and_call_original
+      expect(vivid.read("array", "one", "two")).to eql(nil)
+    end
+
+    it "does not trainwreck when traversing a nil" do
+      expect(root).to receive(:top_level_breadcrumb=).with("nil").and_call_original
+      expect(vivid.read("nil", "one", "two")).to eql(nil)
+    end
+  end
+
+  context "#exist?" do
+    before do
+      # vivify the vividmash, then we're read-only so the cache should never be cleared afterwards
+      vivid
+      expect(root).not_to receive(:reset_cache)
+    end
+
+    it "true if there's a hash key there" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect(vivid.exist?("one", "two", "three")).to be true
+    end
+
+    it "true for intermediate hashes" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect(vivid.exist?("one")).to be true
+    end
+
+    it "true for arrays that exist" do
+      expect(root).to receive(:top_level_breadcrumb=).with("array").and_call_original
+      expect(vivid.exist?("array", 1)).to be true
+    end
+
+    it "true when the value of the key is nil" do
+      expect(root).to receive(:top_level_breadcrumb=).with("nil").and_call_original
+      expect(vivid.exist?("nil")).to be true
+    end
+
+    it "false when attributes don't exist" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect(vivid.exist?("one", "five", "six")).to be false
+    end
+
+    it "false when traversing a non-container" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect(vivid.exist?("one", "two", "three", "four")).to be false
+    end
+
+    it "false when an array index does not exist" do
+      expect(root).to receive(:top_level_breadcrumb=).with("array").and_call_original
+      expect(vivid.exist?("array", 3)).to be false
+    end
+
+    it "false when traversing a nil" do
+      expect(root).to receive(:top_level_breadcrumb=).with("nil").and_call_original
+      expect(vivid.exist?("nil", "foo", "bar")).to be false
+    end
+  end
+
+  context "#read!" do
+    before do
+      # vivify the vividmash, then we're read-only so the cache should never be cleared afterwards
+      vivid
+      expect(root).not_to receive(:reset_cache)
+    end
+
+    it "reads hashes deeply" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect(vivid.read!("one", "two", "three")).to eql("four")
+    end
+
+    it "reads arrays deeply" do
+      expect(root).to receive(:top_level_breadcrumb=).with("array").and_call_original
+      expect(vivid.read!("array", 1)).to eql(1)
+    end
+
+    it "throws an exception when attributes do not exist" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect { vivid.read!("one", "five", "six") }.to raise_error(Chef::Exceptions::NoSuchAttribute)
+    end
+
+    it "throws an exception when traversing a non-container" do
+      expect(root).to receive(:top_level_breadcrumb=).with("one").and_call_original
+      expect { vivid.read!("one", "two", "three", "four") }.to raise_error(Chef::Exceptions::NoSuchAttribute)
+    end
+
+    it "throws an exception when an array element does not exist" do
+      expect(root).to receive(:top_level_breadcrumb=).with("array").and_call_original
+      expect { vivid.read!("array", 3) }.to raise_error(Chef::Exceptions::NoSuchAttribute)
+    end
+  end
+
+  context "#write" do
+    before do
+      vivid
+      expect(root).not_to receive(:reset_cache).with(nil)
+    end
+
+    it "should write into hashes" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write("one", "five", "six")
+      expect(vivid["one"]["five"]).to eql("six")
+    end
+
+    it "should deeply autovivify" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write("one", "five", "six", "seven", "eight", "nine", "ten")
+      expect(vivid["one"]["five"]["six"]["seven"]["eight"]["nine"]).to eql("ten")
+    end
+
+    it "should raise an exception if you overwrite an array with a hash" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("array")
+      vivid.write("array", "five", "six")
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => { "five" => "six" }, "nil" => nil })
+    end
+
+    it "should raise an exception if you traverse through an array with a hash" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("array")
+      vivid.write("array", "five", "six", "seven")
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => { "five" => { "six" => "seven" } }, "nil" => nil })
+    end
+
+    it "should raise an exception if you overwrite a string with a hash" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write("one", "two", "three", "four", "five")
+      expect(vivid).to eql({ "one" => { "two" => { "three" => { "four" => "five" } } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should raise an exception if you traverse through a string with a hash" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write("one", "two", "three", "four", "five", "six")
+      expect(vivid).to eql({ "one" => { "two" => { "three" => { "four" => { "five" => "six" } } } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should raise an exception if you overwrite a nil with a hash" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("nil")
+      vivid.write("nil", "one", "two")
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => { "one" => "two" } })
+    end
+
+    it "should raise an exception if you traverse through a nil with a hash" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("nil")
+      vivid.write("nil", "one", "two", "three")
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => { "one" => { "two" => "three" } } })
+    end
+
+    it "writes with a block" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write("one", "five") { "six" }
+      expect(vivid["one"]["five"]).to eql("six")
+    end
+  end
+
+  context "#write!" do
+    before do
+      vivid
+      expect(root).not_to receive(:reset_cache).with(nil)
+    end
+
+    it "should write into hashes" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write!("one", "five", "six")
+      expect(vivid["one"]["five"]).to eql("six")
+    end
+
+    it "should deeply autovivify" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write!("one", "five", "six", "seven", "eight", "nine", "ten")
+      expect(vivid["one"]["five"]["six"]["seven"]["eight"]["nine"]).to eql("ten")
+    end
+
+    it "should raise an exception if you overwrite an array with a hash" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.write!("array", "five", "six") }.to raise_error(Chef::Exceptions::AttributeTypeMismatch)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should raise an exception if you traverse through an array with a hash" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.write!("array", "five", "six", "seven") }.to raise_error(Chef::Exceptions::AttributeTypeMismatch)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should raise an exception if you overwrite a string with a hash" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.write!("one", "two", "three", "four", "five") }.to raise_error(Chef::Exceptions::AttributeTypeMismatch)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should raise an exception if you traverse through a string with a hash" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.write!("one", "two", "three", "four", "five", "six") }.to raise_error(Chef::Exceptions::AttributeTypeMismatch)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should raise an exception if you overwrite a nil with a hash" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.write!("nil", "one", "two") }.to raise_error(Chef::Exceptions::AttributeTypeMismatch)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should raise an exception if you traverse through a nil with a hash" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.write!("nil", "one", "two", "three") }.to raise_error(Chef::Exceptions::AttributeTypeMismatch)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "writes with a block" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      vivid.write!("one", "five") { "six" }
+      expect(vivid["one"]["five"]).to eql("six")
+    end
+  end
+
+  context "#unlink" do
+    before do
+      vivid
+      expect(root).not_to receive(:reset_cache).with(nil)
+    end
+
+    it "should return nil if the keys already don't exist" do
+      expect(root).not_to receive(:reset_cache)
+      expect(vivid.unlink("five", "six", "seven", "eight")).to eql(nil)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should unlink hashes" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      expect( vivid.unlink("one") ).to eql({ "two" => { "three" => "four" } })
+      expect(vivid).to eql({ "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should unlink array elements" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("array")
+      expect(vivid.unlink("array", 2)).to eql(2)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1 ], "nil" => nil })
+    end
+
+    it "should unlink nil" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("nil")
+      expect(vivid.unlink("nil")).to eql(nil)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ] })
+    end
+
+    it "should traverse a nil and safely do nothing" do
+      expect(root).not_to receive(:reset_cache)
+      expect(vivid.unlink("nil", "foo")).to eql(nil)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+  end
+
+  context "#unlink!" do
+    before do
+      vivid
+      expect(root).not_to receive(:reset_cache).with(nil)
+    end
+
+    it "should raise an exception if the keys already don't exist" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.unlink!("five", "six", "seven", "eight") }.to raise_error(Chef::Exceptions::NoSuchAttribute)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should unlink! hashes" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("one")
+      expect( vivid.unlink!("one") ).to eql({ "two" => { "three" => "four" } })
+      expect(vivid).to eql({ "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+
+    it "should unlink! array elements" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("array")
+      expect(vivid.unlink!("array", 2)).to eql(2)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1 ], "nil" => nil })
+    end
+
+    it "should unlink! nil" do
+      expect(root).to receive(:reset_cache).at_least(:once).with("nil")
+      expect(vivid.unlink!("nil")).to eql(nil)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ] })
+    end
+
+    it "should raise an exception if it traverses a nil" do
+      expect(root).not_to receive(:reset_cache)
+      expect { vivid.unlink!("nil", "foo") }.to raise_error(Chef::Exceptions::NoSuchAttribute)
+      expect(vivid).to eql({ "one" => { "two" => { "three" => "four" } }, "array" => [ 0, 1, 2 ], "nil" => nil })
+    end
+  end
+end
diff --git a/spec/unit/node_spec.rb b/spec/unit/node_spec.rb
index 923b488f72..af9a6e94fc 100644
--- a/spec/unit/node_spec.rb
+++ b/spec/unit/node_spec.rb
@@ -233,60 +233,63 @@ describe Chef::Node do
     end
 
     it "should let you go deep with attribute?" do
-      node.set["battles"]["people"]["wonkey"] = true
+      node.normal["battles"]["people"]["wonkey"] = true
       expect(node["battles"]["people"].attribute?("wonkey")).to eq(true)
       expect(node["battles"]["people"].attribute?("snozzberry")).to eq(false)
     end
 
     it "does not allow you to set an attribute via method_missing" do
+      Chef::Config[:treat_deprecation_warnings_as_errors] = false
       expect { node.sunshine = "is bright" }.to raise_error(Chef::Exceptions::ImmutableAttributeModification)
     end
 
     it "should allow you get get an attribute via method_missing" do
+      Chef::Config[:treat_deprecation_warnings_as_errors] = false
       node.default.sunshine = "is bright"
       expect(node.sunshine).to eql("is bright")
     end
 
     describe "normal attributes" do
       it "should allow you to set an attribute with set, without pre-declaring a hash" do
-        node.set[:snoopy][:is_a_puppy] = true
+        node.normal[:snoopy][:is_a_puppy] = true
         expect(node[:snoopy][:is_a_puppy]).to eq(true)
       end
 
       it "should allow you to set an attribute with set_unless" do
-        node.set_unless[:snoopy][:is_a_puppy] = false
+        node.normal_unless[:snoopy][:is_a_puppy] = false
         expect(node[:snoopy][:is_a_puppy]).to eq(false)
       end
 
       it "should not allow you to set an attribute with set_unless if it already exists" do
-        node.set[:snoopy][:is_a_puppy] = true
-        node.set_unless[:snoopy][:is_a_puppy] = false
+        node.normal[:snoopy][:is_a_puppy] = true
+        node.normal_unless[:snoopy][:is_a_puppy] = false
         expect(node[:snoopy][:is_a_puppy]).to eq(true)
       end
 
       it "should allow you to set an attribute with set_unless if is a nil value" do
         node.attributes.normal = { snoopy: { is_a_puppy: nil } }
-        node.set_unless[:snoopy][:is_a_puppy] = false
+        node.normal_unless[:snoopy][:is_a_puppy] = false
         expect(node[:snoopy][:is_a_puppy]).to eq(false)
       end
 
       it "should allow you to set a value after a set_unless" do
         # this tests for set_unless_present state bleeding between statements CHEF-3806
-        node.set_unless[:snoopy][:is_a_puppy] = false
-        node.set[:snoopy][:is_a_puppy] = true
+        node.normal_unless[:snoopy][:is_a_puppy] = false
+        node.normal[:snoopy][:is_a_puppy] = true
         expect(node[:snoopy][:is_a_puppy]).to eq(true)
       end
 
       it "should let you set a value after a 'dangling' set_unless" do
         # this tests for set_unless_present state bleeding between statements CHEF-3806
-        node.set[:snoopy][:is_a_puppy] = "what"
-        node.set_unless[:snoopy][:is_a_puppy]
-        node.set[:snoopy][:is_a_puppy] = true
+        node.normal[:snoopy][:is_a_puppy] = "what"
+        node.normal_unless[:snoopy][:is_a_puppy]
+        node.normal[:snoopy][:is_a_puppy] = true
         expect(node[:snoopy][:is_a_puppy]).to eq(true)
       end
 
       it "auto-vivifies attributes created via method syntax" do
-        node.set.fuu.bahrr.baz = "qux"
+        Chef::Config[:treat_deprecation_warnings_as_errors] = false
+        node.normal.fuu.bahrr.baz = "qux"
         expect(node.fuu.bahrr.baz).to eq("qux")
       end
 
@@ -295,6 +298,20 @@ describe Chef::Node do
         node.tag("three", "four")
         expect(node["tags"]).to eq(%w{one two three four})
       end
+
+      it "set is a deprecated alias for normal" do
+        Chef::Config[:treat_deprecation_warnings_as_errors] = false
+        expect(Chef).to receive(:log_deprecation).with(/set is deprecated/)
+        node.set[:snoopy][:is_a_puppy] = true
+        expect(node[:snoopy][:is_a_puppy]).to eq(true)
+      end
+
+      it "set_unless is a deprecated alias for normal_unless" do
+        Chef::Config[:treat_deprecation_warnings_as_errors] = false
+        expect(Chef).to receive(:log_deprecation).with(/set_unless is deprecated/)
+        node.set_unless[:snoopy][:is_a_puppy] = false
+        expect(node[:snoopy][:is_a_puppy]).to eq(false)
+      end
     end
 
     describe "default attributes" do
@@ -329,7 +346,14 @@ describe Chef::Node do
         expect(node[:snoopy][:is_a_puppy]).to eq(true)
       end
 
+      it "does not exhibit chef/chef/issues/5005 bug" do
+        node.env_default["a"]["r1"]["g"]["u"] = "u1"
+        node.default_unless["a"]["r1"]["g"]["r"] = "r"
+        expect(node["a"]["r1"]["g"]["u"]).to eql("u1")
+      end
+
       it "auto-vivifies attributes created via method syntax" do
+        Chef::Config[:treat_deprecation_warnings_as_errors] = false
         node.default.fuu.bahrr.baz = "qux"
         expect(node.fuu.bahrr.baz).to eq("qux")
       end
@@ -368,6 +392,7 @@ describe Chef::Node do
       end
 
       it "auto-vivifies attributes created via method syntax" do
+        Chef::Config[:treat_deprecation_warnings_as_errors] = false
         node.override.fuu.bahrr.baz = "qux"
         expect(node.fuu.bahrr.baz).to eq("qux")
       end
@@ -453,8 +478,9 @@ describe Chef::Node do
           expect( node["mysql"]["server"][0]["port"] ).to be_nil
         end
 
-        it "does not have a horrible error message when mistaking arrays for hashes" do
-          expect { node.rm("mysql", "server", "port") }.to raise_error(TypeError, "Wrong type in index of attribute (did you use a Hash index on an Array?)")
+        it "when mistaking arrays for hashes, it considers the value removed and does nothing" do
+          node.rm("mysql", "server", "port")
+          expect(node["mysql"]["server"][0]["port"]).to eql(3456)
         end
       end
     end
@@ -706,6 +732,7 @@ describe Chef::Node do
     #
     describe "deep merge attribute cache edge conditions" do
       it "does not error with complicated attribute substitution" do
+        Chef::Config[:treat_deprecation_warnings_as_errors] = false
         node.default["chef_attribute_hell"]["attr1"] = "attribute1"
         node.default["chef_attribute_hell"]["attr2"] = "#{node.chef_attribute_hell.attr1}/attr2"
         expect { node.default["chef_attribute_hell"]["attr3"] = "#{node.chef_attribute_hell.attr2}/attr3" }.not_to raise_error
@@ -720,6 +747,7 @@ describe Chef::Node do
       end
 
       it "method interpolation syntax also works" do
+        Chef::Config[:treat_deprecation_warnings_as_errors] = false
         node.default["passenger"]["version"]     = "4.0.57"
         node.default["passenger"]["root_path"]   = "passenger-#{node['passenger']['version']}"
         node.default["passenger"]["root_path_2"] = "passenger-#{node.passenger['version']}"
@@ -729,6 +757,7 @@ describe Chef::Node do
     end
 
     it "should raise an ArgumentError if you ask for an attribute that doesn't exist via method_missing" do
+      Chef::Config[:treat_deprecation_warnings_as_errors] = false
       expect { node.sunshine }.to raise_error(NoMethodError)
     end
 
@@ -744,6 +773,51 @@ describe Chef::Node do
       expect(seen_attributes["sunshine"]).to eq("is bright")
       expect(seen_attributes["canada"]).to eq("is a nice place")
     end
+
+    describe "functional attribute API" do
+      # deeper functional testing of this API is in the VividMash spec tests
+      it "should have an exist? function" do
+        node.default["foo"]["bar"] = "baz"
+        expect(node.exist?("foo", "bar")).to be true
+        expect(node.exist?("bar", "foo")).to be false
+      end
+
+      it "should have a read function" do
+        node.override["foo"]["bar"] = "baz"
+        expect(node.read("foo", "bar")).to eql("baz")
+        expect(node.read("bar", "foo")).to eql(nil)
+      end
+
+      it "should have a read! function" do
+        node.override["foo"]["bar"] = "baz"
+        expect(node.read!("foo", "bar")).to eql("baz")
+        expect { node.read!("bar", "foo") }.to raise_error(Chef::Exceptions::NoSuchAttribute)
+      end
+
+      it "delegates write(:level) to node.level.write()" do
+        node.write(:default, "foo", "bar", "baz")
+        expect(node.default["foo"]["bar"]).to eql("baz")
+      end
+
+      it "delegates write!(:level) to node.level.write!()" do
+        node.write!(:default, "foo", "bar", "baz")
+        expect(node.default["foo"]["bar"]).to eql("baz")
+        node.default["bar"] = true
+        expect { node.write!(:default, "bar", "foo", "baz") }.to raise_error(Chef::Exceptions::AttributeTypeMismatch)
+      end
+
+      it "delegates unlink(:level) to node.level.unlink()" do
+        node.default["foo"]["bar"] = "baz"
+        expect(node.unlink(:default, "foo", "bar")).to eql("baz")
+        expect(node.unlink(:default, "bar", "foo")).to eql(nil)
+      end
+
+      it "delegates unlink!(:level) to node.level.unlink!()" do
+        node.default["foo"]["bar"] = "baz"
+        expect(node.unlink!(:default, "foo", "bar")).to eql("baz")
+        expect { node.unlink!(:default, "bar", "foo") }.to raise_error(Chef::Exceptions::NoSuchAttribute)
+      end
+    end
   end
 
   describe "consuming json" do
@@ -789,8 +863,8 @@ describe Chef::Node do
 
     it "should add json attributes to the node" do
       node.consume_external_attrs(@ohai_data, { "one" => "two", "three" => "four" })
-      expect(node.one).to eql("two")
-      expect(node.three).to eql("four")
+      expect(node["one"]).to eql("two")
+      expect(node["three"]).to eql("four")
     end
 
     it "should set the tags attribute to an empty array if it is not already defined" do
@@ -824,17 +898,17 @@ describe Chef::Node do
 
     it "deep merges attributes instead of overwriting them" do
       node.consume_external_attrs(@ohai_data, "one" => { "two" => { "three" => "four" } })
-      expect(node.one.to_hash).to eq({ "two" => { "three" => "four" } })
+      expect(node["one"].to_hash).to eq({ "two" => { "three" => "four" } })
       node.consume_external_attrs(@ohai_data, "one" => { "abc" => "123" })
       node.consume_external_attrs(@ohai_data, "one" => { "two" => { "foo" => "bar" } })
-      expect(node.one.to_hash).to eq({ "two" => { "three" => "four", "foo" => "bar" }, "abc" => "123" })
+      expect(node["one"].to_hash).to eq({ "two" => { "three" => "four", "foo" => "bar" }, "abc" => "123" })
     end
 
     it "gives attributes from JSON priority when deep merging" do
       node.consume_external_attrs(@ohai_data, "one" => { "two" => { "three" => "four" } })
-      expect(node.one.to_hash).to eq({ "two" => { "three" => "four" } })
+      expect(node["one"].to_hash).to eq({ "two" => { "three" => "four" } })
       node.consume_external_attrs(@ohai_data, "one" => { "two" => { "three" => "forty-two" } })
-      expect(node.one.to_hash).to eq({ "two" => { "three" => "forty-two" } })
+      expect(node["one"].to_hash).to eq({ "two" => { "three" => "forty-two" } })
     end
 
   end
@@ -1036,10 +1110,10 @@ describe Chef::Node do
     end
 
     it "sets attributes from the files" do
-      expect(node.ldap_server).to eql("ops1prod")
-      expect(node.ldap_basedn).to eql("dc=hjksolutions,dc=com")
-      expect(node.ldap_replication_password).to eql("forsure")
-      expect(node.smokey).to eql("robinson")
+      expect(node["ldap_server"]).to eql("ops1prod")
+      expect(node["ldap_basedn"]).to eql("dc=hjksolutions,dc=com")
+      expect(node["ldap_replication_password"]).to eql("forsure")
+      expect(node["smokey"]).to eql("robinson")
     end
 
     it "gives a sensible error when attempting to load a missing attributes file" do
@@ -1083,8 +1157,8 @@ describe Chef::Node do
     it "should load a node from a ruby file" do
       node.from_file(File.expand_path(File.join(CHEF_SPEC_DATA, "nodes", "test.rb")))
       expect(node.name).to eql("test.example.com-short")
-      expect(node.sunshine).to eql("in")
-      expect(node.something).to eql("else")
+      expect(node["sunshine"]).to eql("in")
+      expect(node["something"]).to eql("else")
       expect(node.run_list).to eq(["operations-master", "operations-monitoring"])
     end
 
@@ -1562,4 +1636,19 @@ describe Chef::Node do
     end
   end
 
+  describe "method_missing handling" do
+    it "should have an #empty? method via Chef::Node::Attribute" do
+      node.default["foo"] = "bar"
+      expect(node.empty?).to be false
+    end
+
+    it "it should correctly implement #respond_to?" do
+      expect(node.respond_to?(:empty?)).to be true
+    end
+
+    it "it should correctly retrieve the method with #method" do
+      expect(node.method(:empty?)).to be_kind_of(Method)
+    end
+  end
+
 end
diff --git a/spec/unit/provider/powershell_script_spec.rb b/spec/unit/provider/powershell_script_spec.rb
index 5b5c783986..96869ff31c 100644
--- a/spec/unit/provider/powershell_script_spec.rb
+++ b/spec/unit/provider/powershell_script_spec.rb
@@ -43,8 +43,8 @@ describe Chef::Provider::PowershellScript, "action_run" do
         allow(Chef::Platform).to receive(:windows_nano_server?).and_return(true)
         allow(provider).to receive(:is_forced_32bit).and_return(false)
         os_info_double = double("os_info")
-        allow(provider.run_context.node.kernel).to receive(:os_info).and_return(os_info_double)
-        allow(os_info_double).to receive(:system_directory).and_return("C:\\Windows\\system32")
+        allow(provider.run_context.node["kernel"]).to receive(:[]).with("os_info").and_return(os_info_double)
+        allow(os_info_double).to receive(:[]).with("system_directory").and_return("C:\\Windows\\system32")
       end
 
       it "sets the -Command flag as the last flag" do
@@ -58,8 +58,8 @@ describe Chef::Provider::PowershellScript, "action_run" do
         allow(Chef::Platform).to receive(:windows_nano_server?).and_return(false)
         allow(provider).to receive(:is_forced_32bit).and_return(false)
         os_info_double = double("os_info")
-        allow(provider.run_context.node.kernel).to receive(:os_info).and_return(os_info_double)
-        allow(os_info_double).to receive(:system_directory).and_return("C:\\Windows\\system32")
+        allow(provider.run_context.node["kernel"]).to receive(:[]).with("os_info").and_return(os_info_double)
+        allow(os_info_double).to receive(:[]).with("system_directory").and_return("C:\\Windows\\system32")
       end
 
       it "sets the -File flag as the last flag" do
diff --git a/spec/unit/run_context_spec.rb b/spec/unit/run_context_spec.rb
index 7b2a27e9f6..234cd3c9e1 100644
--- a/spec/unit/run_context_spec.rb
+++ b/spec/unit/run_context_spec.rb
@@ -153,8 +153,8 @@ describe Chef::RunContext do
     let(:chef_repo_path) { File.expand_path(File.join(CHEF_SPEC_DATA, "cookbooks")) }
     let(:node) {
       node = Chef::Node.new
-      node.set[:platform] = "ubuntu"
-      node.set[:platform_version] = "13.04"
+      node.normal[:platform] = "ubuntu"
+      node.normal[:platform_version] = "13.04"
       node.name("testing")
       node
     }
diff --git a/spec/unit/shell/shell_session_spec.rb b/spec/unit/shell/shell_session_spec.rb
index 22f3dc6f0c..259e6096a4 100644
--- a/spec/unit/shell/shell_session_spec.rb
+++ b/spec/unit/shell/shell_session_spec.rb
@@ -158,7 +158,7 @@ describe Shell::SoloSession do
 
   it "keeps json attribs and passes them to the node for consumption" do
     @session.node_attributes = { "besnard_lakes" => "are_the_dark_horse" }
-    expect(@session.node.besnard_lakes).to eq("are_the_dark_horse")
+    expect(@session.node["besnard_lakes"]).to eq("are_the_dark_horse")
     #pending "1) keep attribs in an ivar 2) pass them to the node 3) feed them to the node on reset"
   end