[systemd-devel] timesyncd equivalent to ntp-wait

[Lennart Poettering]

On Di, 08.08.17 09:13, Shawn Johnson (shawn.johnson at spensatech.com) wrote:

> I need to be able to start a service only after time synchronization has
> occurred.  I implemented this as a systemd target with ntpd and ntp-wait
> but I can't find an equivalent for timesyncd. I found a couple references
> to this problem but didn't find them helpful:
> 
> * [Patch from 2014]
> https://lists.freedesktop.org/archives/systemd-devel/2014-November/025131.html
> * [Github Bug 5097] https://github.com/systemd/systemd/issues/5097
> 
> Worst case I guess I could grep the output of timedatectl for "NTP
> synchronized" but since that tool knows the state of synchronization It
> would seem this information must be available in a more programmatic way.
> Any help would be greatly appreciated. Also, if a solution is found how can
> I submit changes to the documentation? The systemd-timesyncd.service man
> page is pretty weak.

We really should add a concept like this, and this has been on the
TODO list for a while, but so far nobody sat down and actually did
something about this. We'd be happy to take patches for this though...

I figure this could either be implemented via some dbus API, or simply
by doing a touch file thingy: as soon as timesyncd considers the clock
synchronized it could just touch a file in /run/systemd/timesync/ or
so. And the systemd-timesync-wait.service tool could use inotify to
wait for that to appear or so.

Would be happy to take a patch for this!

All patches are best submitted through github, regardless if code or
man page fixes, after all this all is maintained in the same git repo!

https://github.com/systemd/systemd

Lennart

-- 
Lennart Poettering, Red Hat