Improved uci/hotplug based button handler for OpenWrt

openwrt-button-hotplug

#!/bin/sh
# Improved uci/hotplug based button handler for OpenWrt
#
# Copy this file to /etc/hotplug.d/button/00-button and make it executable (chmod +x …)
# Add button event sections to /etc/config/system, e.g.
#     config button
#         option button 'wps'
#         option action 'released'
#         option handler '/sbin/reboot'
#         option min 5
#         option max 30
#
# Based on https://dev.openwrt.org/browser/trunk/target/linux/atheros/base-files/etc/hotplug.d/button/00-button?rev=12179
# Copyright 2008 John "blogic" Crispin
# Copyright 2016 Daniel Rudolf <www.daniel-rudolf.de>

. /lib/functions.sh

do_button () {
    local CONF_BUTTON
    local CONF_ACTION
    local CONF_HANDLER
    local CONF_MIN
    local CONF_MAX

    config_get CONF_BUTTON "$1" "button"
    config_get CONF_ACTION "$1" "action"
    config_get CONF_HANDLER "$1" "handler"
    config_get CONF_MIN "$1" "min"
    config_get CONF_MAX "$1" "max"

    if [ "$ACTION" == "$CONF_ACTION" ] && [ "$BUTTON" == "$CONF_BUTTON" ] && [ -n "$CONF_HANDLER" ]; then
        if [ -z "$CONF_MIN" ] || [ "$SEEN" -ge "$CONF_MIN" ]; then
            if [ -z "$CONF_MAX" ] || [ "$SEEN" -le "$CONF_MAX" ]; then
                eval "$CONF_HANDLER"
            fi
        fi
    fi
}

logger "Button $BUTTON $ACTION (seen $SEEN sec.)"

config_load "system"
config_foreach "do_button" "button"