You can clone with
HTTPS or Subversion.
Updating from Rails 3.0.0 to 3.0.3,
has_attachment :storage => :file_system, :path_prefix => 'public/uploads', :max_size => 5.megabytes
now delivers "The file you uploaded was larger than the maximum allowed size." even for a tiny file.
Shit, I'm on the wrong page. This is for Paperclip.