Lennart Poettering wrote in message <20141020173828.GA4509@gardel-login>:
> They should probably adopt socket activation anyway, otherwise they'd
> be quite annoying on multi-user systems if lingering is used.
I am brainstorming here, but would it make sense to add hooks to logind
when a session is started/closed (both system hooks and user hooks)?
For instance when I log into X, my .xprofile contains
systemctl --no-block --user start "xsession@${DISPLAY}.target"
to start my user services.
I need to make sure that everyway I have to log into X (with a *DM, with
startx, with xinit) I somehow source .xprofile.
Stopping the started services also involve some contorsion. When I quit X
most of the services started by xsession@$DISPLAY fails because X is no
longer available, and I don't want systemd to try to restart them in this
case. So I need to stop these services whenever X exits.
So inside [email protected], I launch [email protected]:
[Unit]
Description=Watch for X on display %I
[email protected]
[Service]
Environment=DISPLAY=%I
SyslogIdentifier=xwatch@%I
ExecStart=/bin/sh -c 'exec %h/mine/script/services/xwatch %I'
Nice=19
[Install]
[email protected]
with $ cat ~/script/services/xwatch
#!/bin/sh
xprop -spy -root XFree86_VT
systemctl --user stop "xsession@$1.target"
So whenever my X session stops, xwatch will stop xsession@$DISPLAY.target,
and thus stop all services files that I configured to be PartOf
[email protected]. For instance [email protected]:
[Unit]
Description=xcompmgr on display %I
[email protected]
ConditionFileIsExecutable=/usr/bin/xcompmgr
[Service]
Environment=DISPLAY=%I
ExecStart=/usr/bin/xcompmgr
Restart=on-failure
RestartSec=3
StandardOutput=null
[Install]
[email protected]
[email protected]
It works really well, I can even log onto different X sessions and have the
corresponding services launched into the different $DISPLAY, but having
some close hooks in logind would help getting rid of xwatch.service.
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