1 files changed, 45 insertions, 0 deletions
diff --git a/lib/chef/platform/handler_map.rb b/lib/chef/platform/handler_map.rb
new file mode 100644
index 0000000000..001eb3dc8f
--- /dev/null
+++ b/lib/chef/platform/handler_map.rb
@@ -0,0 +1,45 @@
+#
+# Author:: John Keiser (<jkeiser@chef.io>)
+# Copyright:: Copyright (c) 2015 Opscode, 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_map'
+
+class Chef
+  class Platform
+    class HandlerMap < Chef::NodeMap
+      #
+      # "provides" lines with identical filters sort by class name (ascending).
+      #
+      def compare_matchers(key, new_matcher, matcher)
+        cmp = super
+        if cmp == 0
+          # Sort by class name (ascending) as well, if all other properties
+          # are exactly equal
+          if new_matcher[:value].is_a?(Class) && !new_matcher[:override]
+            cmp = compare_matcher_properties(new_matcher, matcher) { |m| m[:value].name }
+            if cmp < 0
+              Chef::Log.warn "You are overriding #{key} on #{new_matcher[:filters].inspect} with #{new_matcher[:value].inspect}: used to be #{matcher[:value].inspect}. Use override: true if this is what you intended."
+            elsif cmp > 0
+              Chef::Log.warn "You declared a new resource #{new_matcher[:value].inspect} for resource #{key}, but it comes alphabetically after #{matcher[:value].inspect} and has the same filters (#{new_matcher[:filters].inspect}), so it will not be used. Use override: true if you want to use it for #{key}."
+            end
+          end
+        end
+        cmp
+      end
+    end
+  end
+end