I would like to add support for setting 'org-babel-noweb-wrap-start and
'org-babel-noweb-wrap-end for each src block individually using the
header args :noweb-start and :noweb-end:

#+name: firewall-safe-mode
#+begin_src sh
  echo "Firewall is now in safe mode."
#+end_src

#+name: firewall
#+begin_src sh  :noweb yes :noweb-start <<< :noweb-end >>>
  safe_mode () {
      echo "Error encountered, switching to safe mode."
      <<<firewall-safe-mode>>>
      exit 1
  }

  setup-firewall || safe_mode
#+end_src

#+begin_src sh :noweb yes :noweb-start ":-) " :noweb-end " (-:" :tangle "test.sh"
  # Setup firewall
  :-) firewall (-:

  # Do other things
#+end_src


Here is a simple way to implement this feature.