Comment 25 for bug 1636912

Ryan Harper [2016-10-28 18:46 -0000]:
> netplan generator only emits the "systemd-networkd" target wants, so
> if we use After=systemd-networkd-wait-online; that's never run since
> nothing wants it.

Right, if you want it, you need to pull it in yourself.

> If we add it explicitly, then it runs even when networkd doesn't

Oh, indeed -- it quickly ends with "Dependency failed" as networkd is
just a Requisite=, not a Requires=. So this actually does give you
exactly the semantics that we want, no? *If* networkd is running then
it waits for it, otherwise it's a no-op.

@Steve: ^ So I take back my previous comment -- it seems
Requires/After=s-n-wait-online.service is actually exactly what we
want after all.

> I did play with it, but the networkd in xenial blocks for some non-trivial
> amount of time (10s of seconds)
> if dbus.service is not up.

OK, that's something to look into then. It doesn't hang if there's no
configuration (i. e not trivially reproducible), I'll check if I can
reproduce this with a real config ASAP.