Comment 2 for bug 950183

Adem, I can confirm that if it returns 0 on failure, which is really bad behaviour. Its really sad that such simple things can cause so much trouble.

For now the fastest fix is to see if err: is returned by puppet config print in the postinst before even doing anything and if so the postinst should exit the install, roll back any changes and give a message that puppet.conf should be fixed first before reinstalling.