Registration of TAG+="systemd" udev rules?

[Ian Campbell]

On Sun, 2015-05-10 at 15:39 +0200, Michael Biebl wrote:
> Am 10.05.2015 um 15:37 schrieb Michael Biebl:
> > Am 10.05.2015 um 14:46 schrieb Ian Campbell:
> >> Hello,
> >>
> >> In adding systemd unit support to the qcontrol package (#781886) I
> >> needed to add a udev rule (60-qcontrol.rules):
> >>         KERNELS=="gpio-keys", SUBSYSTEMS=="platform", DRIVERS=="gpio-keys", TAG+="systemd"
> >>
> >> In order to tag /dev/input/by-path/platform-gpio-keys-event for systemd,
> >> so that the dev-input-by\x2dpath-platform\x2dgpio\x2dkeys
> >> \x2devent.device unit works correctly and can be depended on by qcontrol.
> > 
> > That sounds wrong. Why would you want to do that?
> > 
> > If you want to start a service if hardware shows up, use SYSTEMD_WANTS
> > in the rules file.
> > If you want to stop the service if the hardware goes away, use BindsTo=
> > in the service file.
> 
> 
> Aside from what I already said in
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=781886#35

I did reread this before posting, but the SYSTEMD_WANTS approach didn't
seem to fit, perhaps I've misunderstood it though.

BTW, I couldn't find any mention of SYSTEMD_WANTS in the bluez package.

Ian.