13:15 <gchristensen> I wonder if anyone knows of prior art for a timer which wakes a system up from sleep, does a thing, and then puts the system back to sleep only if it did actually wake the system? timers have WakeSystem, which explicitly does not put the system back to sleep

13:21 <andi-> I've been thinking about that stuff for years but never investigated. Would be neat to do that

13:21 <andi-> Whats you application?

13:21 <gchristensen> if my laptop is asleep and it is plugged in to power, I'd like it to wake up once an hour to start a backup

13:22 <gchristensen> (or maybe just once in a given sleep cycle -- but that seems trickier to explain and once an hour is trivial enough to express as a timer)

13:24 <gchristensen> I'd also find it interesting to schedule more things like that, on the same condition: if it is plugged in and asleep, see if there is a channel update and do a `nixos-rebuild build` and then prompt me when I open my laptop to switch