#!/usr/bin/env bash
###########################################################################
##  Copyright (C) Wizardry and Steamworks 2024 - License: MIT            ##
###########################################################################
# The following script will reload monit upon configuration changes and   #
# the script is meant to be ran as a standalone long-runnng process.      #
# Note that the script uses "inotifywait" and leverages filesystem file   #
# notifiacations for a lower CPU usage and only asynchronously reloads    #
# the configuration when changes have been made (ie: instead of polling). #
###########################################################################

# alarm(2)
function alarm {
    sleep $1
    monit reload
}

ALARM_PID=0
trap '{ test $ALARM_PID = 0 || kill -9 $ALARM_PID; }' KILL QUIT TERM EXIT INT HUP

MONIT_DIRECTORY=/conf
inotifywait -q -m "$MONIT_DIRECTORY" -r \
    -e "modify" -e "create" -e "delete" | \
    while IFS=$'\n' read -r LINE; do
    if [ -d /proc/"$ALARM_PID" ]; then    
        kill -9 $ALARM_PID
    fi
    alarm "5" &
    ALARM_PID=$!
done