def create_link(a, b)
      log.debug(log_key) { "Linking `#{a}' to `#{b}'" }
      FileUtils.ln_s(a, b)
    end
def create_link(a, b)
      log.debug(log_key) { "Linking `#{a}' to `#{b}'" }
      FileUtils.ln_s(a, b)
    end
Create a symlink from a to b

 @param [String] a
 @param [String] b