cook question: how to cook an recipe if, and only if, the target does not already exist

I have a file /usr/local/etc/petitecloud/settings that must not be
overwritten if it does exists but create with default values if it does...
namely I want it cooked once and only once for the entire project's history
(new change se's do not recook it)... the best I can think of is something
like:

/usr/local/etc/petitecloud/settings:
{
    if [not [exists [target]]] {
        main recipe body
   }
}

also if anyone is interested in virtualization take a look at
petitecloud.org (Walter or who ever can you add it to the user's of aegis
list under my name)

_______________________________________________
Aegis-users mailing list
[email protected]
http://lists.auug.org.au/listinfo/aegis-users