What replaces acpid event handling in SLES 12 SP1?

SUSE Product Topics SLES Configure-Administer
1

I am migrating from SLES 11 SP4 to SLES 12 SP1 and I can’t figure out how to handle ACPID events. I understand the the 3.12 kernel does not support the legacy acpid package.
So I have to work with systemd. I want to only power down the computer if the power button is pressed twice within five seconds.

In /etc/systemd/login.conf, there is HandlePowerKey which specifies which action is invoked when the power key is pressed. But the actions seem limited to only these:

[INDENT]ignore, poweroff, reboot, halt, suspend, hibernate, hybrid-sleep, lock or kexec.[/INDENT]

is there a way to call a custom script when the power key is pressed?

2

Hi
If you look at the man page for logind.conf there are options to
configue eg InhibitDelayMaxSec (which defaults to 5sec) and the next
two options.

Looks like a udev rule with a power-switch tag
(see /usr/lib/udev/rules.d/70-power-switch.rules) should suffice.

–
Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
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3

Thank you. I will try your suggestion.

Jay

[QUOTE=malcolmlewis;32891]Hi
If you look at the man page for logind.conf there are options to
configue eg InhibitDelayMaxSec (which defaults to 5sec) and the next
two options.

Looks like a udev rule with a power-switch tag
(see /usr/lib/udev/rules.d/70-power-switch.rules) should suffice.

–
Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
openSUSE Leap 42.1|GNOME 3.16.2|4.1.21-14-default
If you find this post helpful and are logged into the web interface,
please show your appreciation and click on the star below… Thanks![/QUOTE]

4

I figured out how to create my own systemd unit that gets called early in the shutdown process.

But I still do not know how to make the entire power off process conditional. I basically want the computer to shutdown only if the power button is pushed twice within 5 sec.

The Inhibit settings in logind.conf allow you to block the power key while running a command. I don’t see a mechanism to allow conditional execution of a service dynamically.

[QUOTE]Looks like a udev rule with a power-switch tag
(see /usr/lib/udev/rules.d/70-power-switch.rules)[/QUOTE]

I’m not sure what to do with these udev rules. I tried adding a RUN+ clause to them but my script never got called. I tried to replace systemd-logind getting the power key events with my own and then triggering power off target myself. This did not work.

I also tried installing acpid package but no events were triggered by the kernel, as expected.

5

I came up with a solution that may prove useful to someone else:

I noticed that the system log (journalctl) lists the power-button device:

# journalctl -b-0 --unit=systemd-logind | grep -m 1 '/dev/input' Jul 07 21:23:58 sm-1 systemd-logind[2167]: Watching system buttons on /dev/input/event3 (Power Button)

So I wrote a shell script to extract the power-button device and then call a python script to monitor the power-button for events:

[CODE]BUTTON_DEVICE=$(journalctl -b-0 --unit=systemd-logind | grep -m 1 ‘/dev/input’ | cut -f10 -d\ )

systemd-inhibit --what=handle-power-key --mode=block /usr/local/sbin/power-button.py $BUTTON_DEVICE[/CODE]

Notice that we have to use systemd-inhibit to block systemd-logind from processing the power button.

Recall, my goal is to require a user to press the power-button twice within five seconds to activate. Here is my python script:

[CODE]#!/usr/bin/env python

$COPYRIGHT$

import struct
import time
import sys
import syslog
import os

TRIGGER_INTERVAL = 5

SuperMicro power button

infile_path = sys.argv[1] if len(sys.argv) > 1 else “0”

#long int, long int, unsigned short, unsigned short, unsigned int
FORMAT = ‘llHHI’
EVENT_SIZE = struct.calcsize(FORMAT)

#open file in binary mode
in_file = open(infile_path, “rb”)

last_event_time = None
event = in_file.read(EVENT_SIZE)

while event:
(tv_sec, tv_usec, type, code, value) = struct.unpack(FORMAT, event)

    if type == 1 and code == 116 and value == 1:
            if last_event_time and tv_sec - last_event_time <= TRIGGER_INTERVAL:
                    syslog.syslog('Okay, you really mean it.  Shutting down')
                    os.system('/usr/bin/systemctl start systemd-poweroff.service')
            else:
                last_event_time = tv_sec
                syslog.syslog('Someone just pressed the power button!')
    event = in_file.read(EVENT_SIZE)

in_file.close()
[/CODE]

Resources:

[LIST]
[]https://wiki.archlinux.org/index.php/Power_management#Power_management_with_systemd
[]http://stackoverflow.com/questions/5060710/format-of-dev-input-event/16682549
[/LIST]