#!/usr/bin/env bash

# Author: H2 invent GmbH <support@h2-invent.com>
# License: AGPLv3
# Usage: Use the helper script in cronjobs in hosts or containers.
# The cron_lock can be shared so the job will only be executed one.

TIME=$(shuf -i 0-800 -n1)
sleep 0.$TIME
echo "Sleep for 0.$TIME"

echo "Checking cron_lock file"
FILE=$1

if [ ! -f $FILE ]
then
    echo $(hostname) > $FILE
    echo "Create cron_lock for server"

    $2

    if [ $? -ne 0 ]
    then
        echo "FAILED -- $(date) -- $(hostname)" >> $FILE.log
    else
        echo "OK -- $(date) -- $(hostname)" >> $FILE.log
    fi

    echo "Job done. Keep lock for 20 seconds"
    sleep 10
    rm $FILE
    exit 0
else
    echo "Other Server is running cron job"
    sleep 30
    rm $FILE 
    exit 0
fi