copy_file

# File lib/fileutils.rb, line 1259
    def copy_file(dest)
      st = stat()
      File.open(path(),  'rb') {|r|
        File.open(dest, 'wb', st.mode) {|w|
          fu_copy_stream0 r, w, (fu_blksize(st) || fu_default_blksize())
        }
      }
    end