Automatic Checkpoint During Upgrades?

[Haravikk]

After my latest issue (#85) when trying 2.4.1rc5, I've been kicking myself for not running zpool checkpoint on my pools like I normally do before an upgrade — it's such a basic precaution, and while rolling back is not guaranteed to fix a problem, it at least gives an extra recovery option that I might have had to try.

So it got me thinking — would it make sense to add some awareness of checkpoints to the installer? I've had a few different ideas for how it might be done, but I think the simplest would be a check for recent checkpoints, triggering a prompt if necessary.

Basically the installer script would check all detected pools for a checkpoint, and if any either have none, or have an older checkpoint (older than a day?) it will give a prompt saying so and asking for confirmation before proceeding.

Is such a thing possible with a macOS installer script?