# File lib/bundler/compact_index_client/updater.rb, line 105
      def checksum_for_file(path)
        return nil unless path.file?
        # This must use IO.read instead of Digest.file().hexdigest
        # because we need to preserve \n line endings on windows when calculating
        # the checksum
        SharedHelpers.filesystem_access(path, :read) do
          SharedHelpers.digest(:MD5).hexdigest(IO.read(path))
        end
      end