Not really, no. At least, there appear to be a few modules for doing transactional perl code, eg WhatIf and Transaction, but these are not likely to be able to rollback system calls. So you'll need to know how to do that yourself.

Seeing as the permissions call appears to be to a script you wrote yourself, (if I read the post correctly), then surely you know what that does internally, and how to roll it back? You might even make it take some sort of parameter, which makes it rollback itself.

As to the rsync, there are also some Rsync modules, but whether any support rollback/transactions I couldnt see. (I would have thought any decent backup mechanism would be atomic somehow)

C.