Determine file to copy based on classes

[Kai Großjohann]

Is there a way to implement something like the following algorithm in
CFengine?

/----
| repository=$CFINPUTS/../files # Repository of config files.
| file=etc/printcap             # Config file to consider.
| prio="$HOST laptop desktop linux default"
| 
| # Determine subset of $prio that is actually defined in $CFALLCLASSES.
| # Keep same order as in $prio.
| classes=""
| for x in $prio; do
|     case :${CFALLCLASSES}: in
|         :${x}:)
|             classes="${x} ${classes}"
|             ;;
|     esac
| done
| 
| # Now search for an existing file and copy the first file found.
| for c in $classes; do
|     if [ -f $repository/$file/$c ]; then
|         cp $repository/$file/$c /$file
|         exit 0
|     fi
| done
\----

What with all this automatic iteration over colon-separated lists and
so on it should be possible.  But how?

The above is only meant to convey a general idea.  It does not have
to be this exact logic.  The issue is I want to write some files in
the repository and CFengine should automatically pick the "right"
one.  And I don't want to write a file for each host.  (Of course, it
would be easy to copy the file that's named like the host.)  Instead,
I want to write files that are named after CFengine classes, and the
most specific file should be preferred.

kai
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