Auto-update PaperMc start script for testserver

start.sh

#!/bin/bash

# NOTE: Requires jq to be installed (Ubuntu: sudo apt install jq -y)

# Change Minecraft version and amount of RAM to use here!
MC_VERSION="1.21.1"
MEMORY="5G"

## DO NOT TOUCH BELOW ##

# Set the title for the console
echo -e "\033]0;Minecraft Server Console [Testserver]\007"
clear

# Variables
PAPER_API="https://api.papermc.io/v2/projects/paper/versions/$MC_VERSION"
LATEST_BUILD=$(curl -s "$PAPER_API" | jq -r '.builds[-1]')
JAR_FILE="paper-$MC_VERSION-$LATEST_BUILD.jar"

# Check if the jar file already exists
if [ ! -f "$JAR_FILE" ]; then
    echo "Downloading the latest PaperSpigot build ($LATEST_BUILD) for Minecraft $MC_VERSION..."
    
    # Build URL for the latest jar
    PAPER_JAR_URL="$PAPER_API/builds/$LATEST_BUILD/downloads/paper-$MC_VERSION-$LATEST_BUILD.jar"

    # Download the latest build and save it with the correct name
    curl -o "$JAR_FILE" "$PAPER_JAR_URL"

    echo "Downloaded PaperSpigot build $LATEST_BUILD."
else
    echo "You already have the latest PaperSpigot build ($LATEST_BUILD) for Minecraft $MC_VERSION."
fi

# Start the Spigot server using the latest jar file
java -Xms128M -Xmx$MEMORY -jar "$JAR_FILE" nogui

# Pause the script after server exit
read -rsp $'Press any key to continue...\n' -n1 key