[Pkg-acpi-devel] Bug#766991: Bug#766991: acpid: does not process events

Michael Biebl biebl at debian.org
Wed Nov 5 13:04:29 UTC 2014

Am 05.11.2014 um 13:02 schrieb Norbert Preining:
> On Wed, 05 Nov 2014, Michael Biebl wrote:
>> A "systemctl enable systemd.service" will hook up acpid.service in
> acpid.service I guess. Yes, but how is that to be incorporated into
> the dpkg scripts?
> Does systemd provide any mechanism for that? When and how should
> the script be run? On every postinst?

The proposed mechanism to enable systemd unit in mintainer script is the
use of dh_systemd. It is possible to enable both, .service *and* socket
unit. Atm, acpid explicitly does *not* enable the .service unit but only
the .socket unit:

       dh_systemd_enable --no-enable debian/acpid.service
       dh_systemd_enable debian/acpid.socket

> And, in the end *why* was it disabled at all?

That's a decision that's up to the maintainer.
Under systemd, there are multiple triggers, how a service can be started

a/ during boot by being pulled in via one of the standard targets like

b/ via socket activation, by a .socket unit

c/ via hardware events (triggered via udev rules, by tagging a device
and setting ENV{SYSTEMD_WANTS}+="foo.service")

d/ via D-Bus service activation, by a dbus system service file.

e/ timer events, by a .timer unit

The maintainer can decide, which one of those is the most suitable for a
given service. It can also be a combination of multiple triggers.

Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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