Mindustry Server Update Script

update.sh

#!/usr/bin/env sh

# Checks if latest version matches the last version downloaded, and if it doesn't, downloads the latest

downloadurl=$(curl -s https://github.com/Anuken/Mindustry/releases/latest/download/server-release.jar \
        | grep -o -P '(?<=a href=").*(?=")' -)
latestversion=$(echo $downloadurl | grep -o -P '(?<=/)v[\d.]+(?=/)')
currentversion=$(if [ -f "version.txt" ]; then
        cat version.txt
else
        echo "v0.0"
fi)

if [ $currentversion != $latestversion ]; then
        echo "Updating $currentversion to $latestversion"
        wget -O "server-release.jar" $downloadurl
        echo $latestversion > version.txt
else
        echo "Already using latest $currentversion"
fi