RFC-102: Deprecation warning in resourcestm/deprecated_properties

* `deprecated_property_alias` allows the resource author to provide
   transition from old properties to new ones with a deprecation
   warning.
* The `deprecated` option on a property emits a deprecation warning.
* The `deprecated` method on a resource takes a message, but does not
  yet emit a deprecation warning.

Signed-off-by: Thom May <thom@chef.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/chef/mixin/properties.rb b/lib/chef/mixin/properties.rb
index 6b95b87063..fb765fbb3a 100644
--- a/lib/chef/mixin/properties.rb
+++ b/lib/chef/mixin/properties.rb
@@ -149,6 +149,10 @@ class Chef
           Property.derive(**options)
         end
 
+        def deprecated_property_alias(from, to, message)
+          Property.emit_deprecated_alias(from, to, message, self)
+        end
+
         #
         # Create a lazy value for assignment to a default value.
         #