Defining a class based on file contents

[Chip Seraphine]

I have a situation where I would like to define a class based on the 
contents of the file, but do not wish to actually modify the file 
itself.   Does anybody know a good way to do this (other than using a 
module or shellcommand)?

I have tried "|BeginGroupIfNoLineContaining" and such, but this doesn't 
do the trick because I can't define classes inside the conditional 
block.  There is no "touch" type command either, so I am not sure of a 
safe way to fool cfengine into thinking the file has been edited without 
doing something dangerous (changing the file) or silly (editing the file 
and then removing the edit).  I was trying to do something clever with 
"abort" and "catchabort", but that doesn't seem well suited to this either.

Has anybody else solved a problem like this?
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