[ris]

These are the nasty solutions I have to deal with at work all the time and my entire job consists of handling things when the "quick" bash cloud init script that someone wrote and various people have made additions to over the years goes wrong.

Bash scripts fail at this task because they are generally not convergent. Ansible makes a basic effort at being convergent, but most of the scripts I've seen are extremely naive about the ways in which a configuration can diverge.