Is it possible to use the `verbatim` environment in a dot2tex node?

Is it possible to use the verbatim environment (i.e. begin{verbatim}...end{verbatim}) in a dot2tex node? If so, please could you provide a MWE?

---

Update: this is the closest I’ve got so far:

digraph g {
d2tdocpreamble = "usepackage{varwidth} usepackage{verbatim} renewcommand{familydefault}{sfdefault}";
graph [ rankdir = "TB" ];
node  [ style="rounded,bold,filled" fillcolor="azure" shape = "box" ];

assume_git         [ texlbl="begin{varwidth}{30em}We'll assume that Git is to be used for source control; so as a precaution against accidentally checking in temporary files used by Vim or OS X, enter the following at the command prompt:verb|echo '*.swp'      >> .gitignore|verb|echo '.DS_Store'  >> .gitignore|end{varwidth}" ];

START              -> assume_git;
}

And this is the output from turning it into a PDF via the command dot2tex --crop --margin 1em --autosize dot2tex_test_006_mwe.dot > dot2tex_test_006_mwe.tex; pdflatex dot2tex_test_006_mwe.tex:

This is unsatisfactory in at least two ways:

1. instead of

   verb|echo '*.swp'      >> .gitignore|verb|echo '.DS_Store'  >> .gitignore|
   

   I would much prefer to have been able to use

   begin{verbatim}
   echo '*.swp'      >> .gitignore
   echo '.DS_Store'  >> .gitignore
   end{verbatim}
   

   to avoid the need for unnecessary markup for every newline in the code block, but the latter generated the following errors:

   ERROR    Failed to process input
   Traceback (most recent call last):
     File "build/bdist.macosx-10.6-universal/egg/dot2tex/dot2tex.py", line 2928, in main
       s =  conv.convert(dotdata)
     File "build/bdist.macosx-10.6-universal/egg/dot2tex/dot2tex.py", line 794, in convert
       return self.do_preview_preproc()
     File "build/bdist.macosx-10.6-universal/egg/dot2tex/dot2tex.py", line 1105, in do_preview_preproc
       hp,dp,wt = pp.texdims[name]
   KeyError: 'assume_git'
   This is pdfTeX, Version 3.1415926-2.3-1.40.12 (TeX Live 2011/MacPorts 2011_5) restricted write18 enabled.
   entering extended mode
   (./dot2tex_test_006_mwe.tex
   LaTeX2e <2009/09/24>
   Babel <v3.8l> and hyphenation patterns for english, dumylang, nohyphenation, czech, slovak, dutch, ukenglish, usenglishmax, basque, french, german-x-2009-06-19, ngerman-x-2009-06-19, german, ngerman, swissgerman, italian, polish, portuguese, spanish, catalan, galician, loaded.
   )
   *
   

2. The verb|...| approach in the MWE does not render the code verbatim. Even my short example has the following problems:

   • in order to avoid error messages, I had to add a backslash in front of the underscore, but now the backslash is rendered. So I need a way to render just an underscore;
   • the straight single quote marks around *.swp and .DS_Store have been replaced by right single quote marks;
   • one member of each pair of greater-than signs has disappeared.

digraph g {
d2tdocpreamble = "
  usepackage{varwidth}
  usepackage{verbatim}
  usepackage{upquote}
  renewcommand{familydefault}{sfdefault}
";
graph [ rankdir = "TB" ];
node  [ style=rounded, fillcolor=azure];

assume_git [ texlbl="begin{varwidth}{30em}
  We'll assume that Git is to be used for source control; so as a precaution against
  accidentally checking in temporary files used by Vim or OS X, enter the following
  at the command prompt:
  begin{verbatim}
  echo '*.swp'      >> .gitignore
  echo '.DS_Store'  >> .gitignore
  end{verbatim}
  end{varwidth}"
 ];

START              -> assume_git;
}