I have chrony servers that are using phc refclocks. Those refclocks are kept in TAI, so I have to specify the current TAI-UTC offset in the `refclock' directive ("offset -37").
I cross check that the current value I have set there seems sane via some monitoring that uses the timezone files to compute the difference between posix/UTC and right/UTC. So, at least when it changes, I'll find out about it (I also make sure my timezone files are up to date). The downside is obviously that I have to go update a bunch of config files and restart chronyd when the next leap second occurs.
I was hoping that I'd be able to use the `leapsectz' directive to ask chrony to automatically calculate the TAI-UTC offset for my refclock, but after some testing, I'm not sure that is possible (or, I'm just doing something wrong).
Is the idea of the leapsectz directive just that your refclock gives you whatever time it gives you (perhaps TAI, perhaps UTC) and the timezone files are just used so chrony can, for example, arm the kernel (if leapsecmode is system) and advertise the impending leap second to downstream clients?
Assuming I'm not misunderstanding, would it be possible to add something to allow the TAI-UTC offset to be dynamically calculated using the timezone files for refclocks?