[PeterWhittaker]

Interesting. I built a sort-of-similar system for executing a series of linked, serially-dependent system commands from the TUI used to manage some of our secure appliances. It made writing and debugging such sequences much easier: each command was represented by a struct containing optional pre, post-success, and post-fail log and status line messages, where status could simply default to log.

It meant that the user received meaningful short updates as things progressed, with detailed information in system logs.

This made it much easier for testers and users to report bugs and for developers to understand what to look for in logs.