[systemd-devel] Systemd --session instance?

[Benno Fünfstück]

>
> On Sat, Apr 22, 2017 at 02:07:49PM +0000, Benno Fünfstück wrote:
> > Hello list,
> >
> > currenty, systemd runs a system instance and a per-user one. However,
> > sometimes it would be nice to have a per-session instance, for example
> for
> > users of lightweight desktop environments that don't have their own
> service
> > manager. Then you could use systemd to spawn things like panels or
> desktop
> > notification daemons etc. Would it be possible to add such a thing, even
> if
> > it may require some work? Or are there any fundamental problems with it?
>
> It would require a fundamental amount of work. We (people developing
> systemd, large graphical environments, dbus, ...) to move towards
> user-sessions,
> and limit support to one graphical session per user. The thinking is that
> one graphical session is enough for one user.
>
> In principle you could still have a single systemd --user instance,
> and e.g. start various services multiple times using templating
> (terminal-daemon at .service, file-manager at .service, etc). This isn't too
> hard to get working in a limited scope, but making it work in general
> is hard, and would require a lot of support from various
> programs. Your use case would be neat, but also a bit fringe, and it's
> complicated enough to get graphical envs working with one session per
> user.
>
> Zbyszek
>

Thanks for the answer! Can you go into some more detail about what
particular challenges there are with making such a thing possible? (Just
some, because currently I feel like it would be easy and I would like to
get a feeling for the kind of problems this would cause / would have to be
dealt with)
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