#!/bin/sh
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EVENT=${1:-short-press}
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LONG_PRESS_TIMEOUT=3 # s
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DEBOUNCE=2 # s
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PIDFILE="/tmp/$(basename $0).pid"
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LOCKFILE=/tmp/.power_key
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short_press()
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{
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logger -t $(basename $0) "[$$]: Power key short press..."
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if which systemctl >/dev/null; then
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SUSPEND_CMD="systemctl suspend"
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elif which pm-suspend >/dev/null; then
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SUSPEND_CMD="pm-suspend"
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else
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SUSPEND_CMD="echo -n mem > /sys/power/state"
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fi
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if [ ! -f $LOCKFILE ]; then
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logger -t $(basename $0) "[$$]: Prepare to suspend..."
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touch $LOCKFILE
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sh -c "$SUSPEND_CMD"
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{ sleep $DEBOUNCE && rm $LOCKFILE; }&
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fi
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}
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long_press()
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{
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logger -t $(basename $0) "[$$]: Power key long press (${LONG_PRESS_TIMEOUT}s)..."
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logger -t $(basename $0) "[$$]: Prepare to power off..."
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poweroff
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}
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logger -t $(basename $0) "[$$]: Received power key event: $@..."
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case "$EVENT" in
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press)
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# Lock it
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exec 3<$0
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flock -x 3
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start-stop-daemon -K -q -p $PIDFILE || true
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start-stop-daemon -S -q -b -m -p $PIDFILE -x /bin/sh -- \
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-c "sleep $LONG_PRESS_TIMEOUT; $0 long-press"
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# Unlock
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flock -u 3
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;;
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release)
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# Avoid race with press event
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sleep .5
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start-stop-daemon -K -q -p $PIDFILE && short_press
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;;
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short-press)
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short_press
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;;
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long-press)
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long_press
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;;
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esac
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