tags always an array; fix set_unless

previously if the node had a { normal: { tags: nil } } that we read
since the key existed (but was nil) we would not initialize with an
array.  replacing the code with a call to node.set_unless revealed that
set_unless was similarly buggy.  fixed both issues by fixing set_unless.

4 files changed, 18 insertions, 6 deletions

diff --git a/lib/chef/node.rb b/lib/chef/node.rb
index b04e607624..b2ef3aaf2f 100644
--- a/lib/chef/node.rb
+++ b/lib/chef/node.rb
@@ -3,7 +3,7 @@
 # Author:: Christopher Brown (<cb@opscode.com>)
 # Author:: Christopher Walters (<cw@opscode.com>)
 # Author:: Tim Hinderliter (<tim@opscode.com>)
-# Copyright:: Copyright (c) 2008-2011 Opscode, Inc.
+# Copyright:: Copyright (c) 2008-2015 Chef Software, Inc.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -372,7 +372,7 @@ class Chef
 
     # Lazy initializer for tags attribute
     def tags
-      normal[:tags] = [] unless attribute?(:tags)
+      normal_unless[:tags] = []
       normal[:tags]
     end
 
diff --git a/lib/chef/node/attribute.rb b/lib/chef/node/attribute.rb
index 45f2ef01ee..7ffac40bf4 100644
--- a/lib/chef/node/attribute.rb
+++ b/lib/chef/node/attribute.rb
@@ -1,7 +1,7 @@
 #--
 # Author:: Adam Jacob (<adam@opscode.com>)
 # Author:: AJ Christensen (<aj@opscode.com>)
-# Copyright:: Copyright (c) 2008 Opscode, Inc.
+# Copyright:: Copyright (c) 2008-2015 Chef Software, Inc.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/lib/chef/node/attribute_collections.rb b/lib/chef/node/attribute_collections.rb
index b912904534..1dcc950c6e 100644
--- a/lib/chef/node/attribute_collections.rb
+++ b/lib/chef/node/attribute_collections.rb
@@ -1,6 +1,6 @@
 #--
 # Author:: Daniel DeLeo (<dan@opscode.com>)
-# Copyright:: Copyright (c) 2012 Opscode, Inc.
+# Copyright:: Copyright (c) 2012-2015 Chef Software, Inc.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -148,7 +148,7 @@ class Chef
 
       def []=(key, value)
         root.top_level_breadcrumb ||= key
-        if set_unless? && key?(key)
+        if set_unless? && key?(key) && !self[key].nil?
           self[key]
         else
           root.reset_cache(root.top_level_breadcrumb)
diff --git a/spec/unit/node_spec.rb b/spec/unit/node_spec.rb
index 4b57a93009..40e8cf8898 100644
--- a/spec/unit/node_spec.rb
+++ b/spec/unit/node_spec.rb
@@ -1,6 +1,6 @@
 #
 # Author:: Adam Jacob (<adam@opscode.com>)
-# Copyright:: Copyright (c) 2008 Opscode, Inc.
+# Copyright:: Copyright (c) 2008-2015 Chef Software, Inc.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -264,6 +264,12 @@ describe Chef::Node do
         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
+        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
@@ -798,6 +804,12 @@ describe Chef::Node do
       expect(node.tags).to eql([ "radiohead" ])
     end
 
+    it "should set the tags attribute to an empty array if it is nil" do
+      node.attributes.normal = { 'tags' => nil }
+      node.consume_external_attrs(@ohai_data, {})
+      expect(node.tags).to eql([])
+    end
+
     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"}})