Power button with regret option by esekeyd (no replies)

I want to orderly shut down my boxes by pressing the power button for 5+ seconds. Sometimes, though, I realize that there is this One More Thing I want to do first, so holding it down for 10+ seconds should do nothing. I also want to see when to release the button. Attached the bash script 'power-off.sh' that, together with 'esekeyd', does the trick. It is tested on Netgear Stora and Netgear ReadyNAS RN102/RN104. It should work with other Linux boxes by just adding 3 new lines to the first case statement.

Copy the script to '/root' and make it executable:

$ sudo chmod +x /root/power-off.sh

$ sudo ls -lF /root/power-off.sh
-rwxr-xr-x 1 root root 1793 Jan 31 13:43 /root/power-off.sh*

$ sudo cat /root/power-off.sh
#!/bin/bash
#
# Script activated by esekeyd when the power button is pressed or released
# Press the power button for 5 to 10 seconds to power off the computer
# States: rest, armed, active, shutdown

# Usage
if [ $# != 1 ]; then
	echo "Usage:" $( basename $0 ) "[released|pressed|timeout]"
	exit 0
fi

# File where the state is stored
state=/tmp/power-off-state

# Led control (default)
led_at_rest="default-on"
led_when_armed="none"
led_when_active="timer"

# Tune in to the current box
model=$( cat /sys/firmware/devicetree/base/model )
case $model in
"NETGEAR MS2000 / MS2110 aka Stora" )
	led="/sys/class/leds/status:blue:activity_led"
;;
"NETGEAR ReadyNAS 102" )
	led="/sys/class/leds/rn102:blue:pwr"; led_at_rest="none"; led_when_armed="default-on"
;;
"NETGEAR ReadyNAS 104" )
	led="/sys/class/leds/rn104:blue:pwr"; led_at_rest="none"; led_when_armed="default-on"
;;
*)
	echo "$0: Please add support for this box ($model) and post it on 'https://forum.doozan.com'"
	echo "$0: Available LEDs are:"; ls /sys/class/leds/ | tr -s ' ' '\n'
	exit 1
;;
esac

# The only arguments handled by this script are released, pressed and timeout
case $1 in
"released" )
	# Shutdown or return to rest?
	if [ $( cat $state ) == "active" ]; then
		echo "shutdown" > $state
		echo $led_at_rest > $led/trigger
		if [[ ! -v DRYRUN ]]; then
			shutdown -h now
		fi
	else
		echo "rest" > $state
		echo $led_at_rest > $led/trigger
	fi
;;
"pressed" )
	# Arm, then wait for released or for timeout
	echo "armed" > $state
	echo $led_when_armed > $led/trigger
	# Spawn a child process to rerun this script again in 5 seconds with argument timeout
	( cd /; exec > /dev/null 2>&1; exec < /dev/null; sleep 5; exec $0 timeout )&
;;
"timeout" )
	# Activate, return to rest or do nothing?
	if [ $( cat $state ) == "armed" ]; then
		echo "active" > $state;
		echo $led_when_active > $led/trigger
		# Spawn a child process to rerun this script again in 5 seconds with argument timeout
		( cd /; exec > /dev/null 2>&1; exec < /dev/null; sleep 5; exec $0 timeout )&
	elif [ $( cat $state ) == "active" ]; then
		echo "rest" > $state
		echo $led_at_rest > $led/trigger
	else
		echo $led_at_rest > $led/trigger
	fi
;;
esac

Install 'esekeyd', press and release the power button while running 'learnkeys' and modify the 2 last lines of '/etc/esekeys.conf':

$ sudo apt install -y esekeyd

$ sudo learnkeys /etc/esekeyd.conf /dev/input/event0
learnkeys (ESE Key Deamon 1.2.7, SVN-r63)

Pres ANY (fun)key... or Ctrl-C to exit...

key KEY_116 stored in config file
key KEY_116 stored in config file
^C
Caught signal 2, writing config file and exiting...

$ sudo nano /etc/esekeyd.conf                  

$ tail -2 /etc/esekeyd.conf
KEY_116(press):   /root/power-off.sh pressed
KEY_116(release): /root/power-off.sh released

(Substitute KEY_116 above with the name of the power button on your box.)

Fix a flaw, enable and start the 'esekeyd' deamon:

$ sudo perl -pi.orig -e 's/DODTIME=10/DIETIME=10/g' /etc/init.d/esekeyd

$ diff /etc/init.d/esekeyd.orig /etc/init.d/esekeyd
52c52
< DODTIME=10
---
> DIETIME=10

$ sudo perl -pi.orig -e 's/START_ESEKEYD=false/START_ESEKEYD=true/g' /etc/default/esekeyd

$ diff /etc/default/esekeyd.orig /etc/default/esekeyd 
4c4
< START_ESEKEYD=false
---
> START_ESEKEYD=true

$ sudo /etc/init.d/esekeyd start
Starting a multimedia keyboard daemon for Linux : esekeydESE Key Deamon 1.2.7 (SVN-r63)
.

Now orderly shutdown should work as described.

To debug or further develop the script, use 'ssh' to open 2 terminal windows to the box:

$ watch -n 1 cat /tmp/power-off-state

$ DRYRUN=1 /root/power-off.sh pressed
$ DRYRUN=1 /root/power-off.sh released

Regards,
Trond Melen

EDIT: Fixed typos in text.
TIDE