On Tue, 2025-04-22 at 09:11 +0100, Barry Scott wrote:
> 
> 
> > On 21 Apr 2025, at 16:16, Gabriel L. Somlo <gso...@gmail.com>
> > wrote:
> > 
> > I'm not quite sure if (and how) one could express "whatever's
> > sitting
> > behind hostnamectl has finally replaced `fedora` with
> > `foo42.example.com` in the transient hostname field", to make
> > sendmail.service wait for (depend on) that trigger...
> 
> In cases like this when network on-line is not sufficient I have
> written
> a service that waits for the particular event. In your case a service
> that
> waits for the hostname to be set would seem to be needed.
> 
> FYI you might ask the systemd folks if there is a solution that's not
> been suggested here.

I wasn't going to comment, although over the years I've seen times when
network on-line isn't sufficient, but a practical alternative may be to
drop in a NetworkManager script in dispatcher.d that restarts sendmail
after an appropriate DHCP step.

If you look in /usr/lib/NetworkManager/dispatcher.d there is already a
10-sendmail script, which restarts it on internface up or down, but you
can maybe modify it with something from 20-chrony-dhcp, which also
tests for "dhcp4-change" and "dhcp6-change".

> 
> Barry
> 
Regards
Frank
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