Initial sketch for provider resolver

1 files changed, 48 insertions, 0 deletions

diff --git a/lib/chef/provider.rb b/lib/chef/provider.rb
index bdfe826944..7cfdf7cbe5 100644
--- a/lib/chef/provider.rb
+++ b/lib/chef/provider.rb
@@ -28,6 +28,54 @@ class Chef
     include Chef::Mixin::WhyRun
     include Chef::Mixin::ShellOut
 
+
+    class << self
+      include Enumerable
+
+      @@providers = []
+
+      attr_reader :implementations
+      attr_reader :supported_platforms
+
+      def inherited(klass)
+        @@providers << klass
+      end
+
+      def providers
+        @@providers
+      end
+
+      def each
+        providers.each { |provider| yield provider }
+        providers
+      end
+
+      def implements(*resources)
+        options = resources.last.is_a?(Hash) ? resources.pop : {}
+
+        @implementations = resources.map { |resource| resource.to_sym }
+        @supported_platforms = Array(options[:on_platforms] || :all)
+      end
+
+      def implements?(resource)
+        klass_name = resource.class.to_s.split('::').last
+        resource_name = klass_name.gsub(/([a-z0-9])([A-Z])/, '\1_\2').downcase
+
+        implementations && implementations.include?(resource_name.to_sym)
+      end
+
+      def supports_platform?(platform)
+        supported_platforms && (
+          supported_platforms.include?(:all) ||
+          supported_platforms.include?(platform.to_sym))
+      end
+
+      def enabled?(node)
+        true
+      end
+    end
+
+
     attr_accessor :new_resource
     attr_accessor :current_resource
     attr_accessor :run_context