Skip temporary directory when target directory is known

Library/Homebrew/resource.rb

@@ -85,13 +85,13 @@ class Resource
   # If block is given, yield to that block
   # A target or a block must be given, but not both
   def unpack(target=nil)
-    mktemp(download_name) do
+    if target
-      downloader.stage
+      mkdir_p(target)
-      if block_given?
+      chdir(target) { downloader.stage }
+    elsif block_given?
+      mktemp(download_name) do
+        downloader.stage
         yield self
-      elsif target
-        target = Pathname.new(target) unless target.is_a? Pathname
-        target.install Dir['*']
       end
     end
   end