triggerhappy: triggerhappy handles event 2 times

Maintainer: @thess
Environment: (armv7l, custom, OpenWrt 22.03.5)

Description:
thriggerhappy handles event 2 times
When testing event with command thd --dump /dev/input/event* I correctly see the press, longpress and release, but when I attach a command to an event with the configuration file I see the event is fired 2 times.

Step to reproduce:

1. Using command thd --dump /dev/input/event* find a suitable key for test, in my case KEY_HOME
2. create a new file under /etc/triggerhappy/triggers.d/ and call it test.conf
3. Inside the new created file add teh line KEY_HOME 1 /root/keyLogger.sh
4. create a new file inside /root and call it keyLogger.sh
5. Inside the new file add this block of code

#!/bin/ash
COUNT_FILE=/tmp/cnt.txt
BTN_PRESS=0

check_previous_pressions() {
        if test -f "$COUNT_FILE"; then
                BTN_PRESS=$(cat $COUNT_FILE)
        else
                touch "$STATUS_FILE"
        fi
        #echo "$BTN_PRESS"
}

check_previous_pressions

BTN_PRESS=$(( BTN_PRESS+1 ))

echo "$BTN_PRESS" > "$COUNT_FILE"

6. save the file and make it executable with chmod +x <name of the file>
7. reboot the system
8. After reboot check the contnent of the file /tmp/cnt.txt, every pression of the test key (in my case KEY_HOME) the counter increase by 2

The problem seems to be releted to the 2 files of the repo

• utils/triggerhappy/files/triggerhappy.init
• utils/triggerhappy/files/triggerhappy.hotplug

The init file attach all event found at boot time, then the hotplug file re-attach things

Start by reading utils/triggerhappy/files/triggerhappy.init and utils/triggerhappy/files/triggerhappy.hotplug, then compare how each attaches input events during boot and hotplug. Reproduce with thd --dump /dev/input/event*, the test.conf KEY_HOME entry, and the provided keyLogger.sh script. Done means each key press increments /tmp/cnt.txt once rather than twice.