[systemd-devel] Standardizing names for graphical session units

[Martin Pitt]

Zbigniew Jędrzejewski-Szmek [2016-07-04 22:20 +0000]:
> I think we should instead enhance target units to provide missing
> functionality. The most important thing would be to have something
> like PartOf, but more nicely configured. PartOf=graphical-kde.target
> would do the trick, but it would need to be configured in each
> unit separately, which would mean that we'd need to duplicate each
> unit for each target, which is unacceptable. I don't see a nice
> way to achieve this with the current set of options. What about
> adding DependenciesPartOf=yes|no on the target unit, with "yes"
> meaning that we automatically add PartOf= dependencies to any service
> which has a Wants= or Requires= dependency to the target.

This would still not be sufficient, AFAICS. The top-level targets will
only have relatively few direct dependencies. Let's suppose
gnome-session.target has
"Requires=mutter.service gnome-settings-daemon.service"
and mutter.service then has a "Wants=at-spi2.service". We still want
to stop at-spi2.service together with the session.

DependenciesPartOf=yes in gnome.target would not achieve that (or it
would need to apply transitively, and to Wants= as well, which sounds
quite strange). OTOH adding "PartOf=graphical-session.target" to all
graphical session specific user services works fine and works with the
existing systemd model and dependencies.

Martin

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)