update.sh

#!/bin/bash
set -euf -o pipefail

cd /opt/minecraft/server/;
/usr/bin/echo "Comparing Checksums";
oldsum=$(/usr/bin/md5sum paperclip.jar | /usr/bin/awk '{print $1}');
/usr/bin/echo "Download paperclip for comparison"
/usr/bin/wget https://papermc.io/api/v1/paper/1.16.3/latest/download --output-document=paperclip.jar.tmp --no-cache;
newsum=$(/usr/bin/md5sum paperclip.jar.tmp | /usr/bin/awk '{print $1}');
/usr/bin/date;

if [[ "$oldsum" != "$newsum" ]]; then
        /usr/bin/echo "Update Required";
        /usr/bin/echo "Stopping Server";
        /opt/minecraft/tools/mcrcon/mcrcon -H HOST -P MCRCON_PORT -p MCRCON_PASS stop || true;
        /usr/bin/echo "Rolling paperclip.jar files";
        /usr/bin/mv --force /opt/minecraft/server/paperclip.jar.2 paperclip.jar.3;
        /usr/bin/mv --force /opt/minecraft/server/paperclip.jar.1 paperclip.jar.2;
        /usr/bin/mv --force /opt/minecraft/server/paperclip.jar paperclip.jar.1;
        /usr/bin/echo "Installing new paperclip.jar";
        /usr/bin/mv --force /opt/minecraft/server/paperclip.jar.tmp /opt/minecraft/server/paperclip.jar
        /usr/bin/echo "Set file permissions";
        /usr/bin/chown minecraft:minecraft paperclip.jar;
        /usr/bin/echo "Update Process Complete";
    /usr/bin/date;
        /usr/bin/echo "Starting Minecraft"
        /usr/bin/systemctl start minecraft
        exit 0;
fi
/usr/bin/echo "No Update Available"
exit 0;