Interactive shutdown popup in GNOME when pressing the power button

handler.sh

#!/bin/bash
# Replaces /etc/acpi/handler.sh

case "$1" in
    button/power)
        case "$2" in
            PBTN|PWRF)
                logger 'PowerButton pressed'
                gnome_users=$(pgrep gnome-session | xargs ps -o %u -p | sed 1d)
                while read -r user; do
                    logger "GNOME user: $user"
                    su $user -c "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(id -u $user)/bus gnome-session-quit --power-off" || logger "command failed for $user"
                done <<<"$gnome_users"
                ;;
            *)
                logger "ACPI action undefined: $2"
                ;;
        esac
        ;;
    button/sleep)
        case "$2" in
            SLPB|SBTN)
                logger 'SleepButton pressed'
                ;;
            *)
                logger "ACPI action undefined: $2"
                ;;
        esac
        ;;
    ac_adapter)
        case "$2" in
            AC|ACAD|ADP0)
                case "$4" in
                    00000000)
                        logger 'AC unpluged'
                        ;;
                    00000001)
                        logger 'AC pluged'
                        ;;
                esac
                ;;
            *)
                logger "ACPI action undefined: $2"
                ;;
        esac
        ;;
    battery)
        case "$2" in
            BAT0)
                case "$4" in
                    00000000)
                        logger 'Battery online'
                        ;;
                    00000001)
                        logger 'Battery offline'
                        ;;
                esac
                ;;
            CPU0)
                ;;
            *)  logger "ACPI action undefined: $2" ;;
        esac
        ;;
    button/lid)
        case "$3" in
            close)
                logger 'LID closed'
                ;;
            open)
                logger 'LID opened'
                ;;
            *)
                logger "ACPI action undefined: $3"
                ;;
    esac
    ;;
    *)
        logger "ACPI group/action undefined: $1 / $2"
        ;;
esac

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