class Bundler::CompactIndexClient::Updater

def copy_file(source, dest)
  SharedHelpers.filesystem_access(source, :read) do
    File.open(source, "r") do |s|
      SharedHelpers.filesystem_access(dest, :write) do
        File.open(dest, "wb", s.stat.mode) do |f|
          IO.copy_stream(s, f)
        end
      end
    end
  end
end