Bug#1065624: resolved not working after installation, race with dbus and user creation

[Michael Biebl]

Am 07.03.24 um 15:12 schrieb Timo Weingärtner:
> Package: systemd-resolved
> Version: 252.22-1~deb12u1
> Severity: important
> X-Debbugs-Cc: timo.weingaertner at quantumsimulations.de
> 
> After installing systemd-resolved name resolution does not work anymore:
> ----8<----8<----
> # apt-get --no-install-recommends install systemd-resolved
> […]
> # host debian.org
> Host debian.org not found: 2(SERVFAIL)
> # resolvectl
> Failed to get global data: Connection timed out
> # systemctl restart systemd-resolved.service
> # host debian.org
> debian.org has address […]
> […]
> ----8<----8<----
> 
> The relevant error message from dbus-daemon appears before postinst creates
> the user and starts the service.
> 
> Maybe creating the user in preinst already, before it is referenced in
> dbus config, would be better.
> 
> This is the log, including my workaround:

The chain of events afaics is this:

1/ postinst creates systemd-resolve
2/ systemd-resolved.service is started in postinst
3/ dbus trigger is activated after postinst and the dbus config is reloaded

Because the dbus daemon reload happens after the systemd-resolved user 
has been created, systemd-resolved could not successfully claim the 
org.freedesktop.resolve1 D-Bus name.

What we would need to be able to do is to trigger a dbus daemon-reload 
after the system user has been created and before the service is started.

Both is autogenerated code (via dh_installsysusers and 
dh_installsystemd), and there is no way to inject maintscript code 
manually unfortunately.
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