new class, FileCacheByChecksum used for local cookbook caching

Author: Tim Hinderliter

chef/lib/chef/cache/file_cache_by_checksum.rb

@@ -0,0 +1,35 @@
+class Chef
+  class Cache
+    class FileCacheByChecksum
+      attr_reader :basedir
+      
+      def initialize(basedir = Chef::Config[:file_cache_path])
+        @basedir = basedir
+        
+        
+      end
+
+      # returns path
+      def get_path(checksum)
+        path = checksum_path(checksum)
+        
+        File.exists?(path) ? path : nil
+      end
+      
+      # path = path to tempfile as input
+      # returns destination path
+      def put(checksum, src_path)
+        dest_path = checksum_path(checksum)
+        FileUtils.mkdir_p(File.dirname(dest_path))
+      
+        FileUtils.cp(src_path, dest_path)
+        
+        dest_path
+      end
+      
+      def checksum_path(checksum)
+        File.join(@basedir, checksum[0..1], checksum)
+      end
+    end
+  end
+end