conditional file copy

[Jason Allen]

Is there anyway to do something like the following with Cfengine?

copy:
any::

if(filexists$(linuxfiles)/passwd.$(host)){
        $(linuxfiles)/passwd.$(host)
}else{
        $(linuxfiles)/passwd
}
dest=/etc/passwd
server=$(cfserver)
mode=644
type=sum

In other words I'd like cfengine to copy passwd.$hostname if it exists
and if not copy passwd.

The problem is that want to manage the same files on large numbers of
dissimilar machine and trying to setup logical groups within cfengine is
proving to be very tedious.

Thanks,

Jason Allen
Fermilab