[systemd-devel] How soon after login can I rely on systemd --user having reached sockets.target?

[Mantas Mikulėnas]

On Sun, Oct 19, 2014 at 4:58 PM, Zbigniew Jędrzejewski-Szmek
<zbyszek at in.waw.pl> wrote:
> On Sun, Oct 19, 2014 at 12:43:59PM +0200, Colin Guthrie wrote:
>> David Herrmann wrote on 19/10/14 12:05:
>> > Hi
>> >
>> > On Fri, Oct 17, 2014 at 6:14 PM, Colin Guthrie <gmane at colin.guthr.ie> wrote:
>> >> Hi,
>> >>
>> >> How soon after login can I rely on systemd --user having reached
>> >> sockets.target?
>> >>
>> >> This feels a bit like a "you shouldn't rely on that point in time..."
>> >> type answer is warrented, and when e.g. GNOME or KDE sessions fully use
>> >> systemd to bring themselves up it won't be an issue, but right now,
>> >> systemd --user is started by (I think) PAM.
>> >>
>> >> I want to rely on systemd --user to handle PulseAudio's activation
>> >> (ditching the built in stuff) and but I'm worried that e.g. GNOME or KDE
>> >> might start up their own session stuff and spawn some PA consuming
>> >> process before systemd --user has reached it's sockets.target and is
>> >> thus ready and listening on PA's native socket.
>> >>
>> >> Doesn't seem to be a problem on my machine here (it's working really
>> >> nicely actually!) but figured I should ask here too.
>> >
>> > Ordering of user units is (see /usr/lib/systemd/user/):
>> > default.target after basic.target after sockets.target
>> >
>> > PAM creates sessions by calling into systemd's pam-module, which then
>> > uses CreateSession() (internal api!). This call does not return until
>> > the job of user at .service is done. `systemd --user` notifies READY=1
>> > only after "default.target" is ready.
> Hm, this seems a bit excessive, because default.target can take
> a while. basic.target would seem more natural.

Same -- I never noticed this since I have linger enabled, but I would
be a bit worried about the login blocking until /all/ of my services
have started... Which makes socket activation not very useful.

-- 
Mantas Mikulėnas <grawity at gmail.com>