mc-server-installer.sh

#!/bin/sh

# ARCH VARIABLES

if [ "$SNAP_ARCH" = "amd64" ]; then
  ARCH="x86_64-linux-gnu"
elif [ "$SNAP_ARCH" = "armhf" ]; then
  ARCH="arm-linux-gnueabihf"
else
  ARCH="$SNAP_ARCH-linux-gnu"
fi

# DEFINE LATEST JAR
LATEST=`curl -fsSL 'https://launchermeta.mojang.com/mc/game/version_manifest.json' |jq -r '.latest.release'`

# DEFINE URL
MANIFEST_URL=`curl -fsSL 'https://launchermeta.mojang.com/mc/game/version_manifest.json' |jq -r '.versions[] |select(.id=="'"$LATEST"'") |.url'`

# URL CONT'D
JAR_URL=`curl -fsSL "$MANIFEST_URL" |jq -r '.downloads.server.url'`

# java paths
export JAVA_HOME=$SNAP/usr/lib/jvm/java-1.8.0-openjdk-$SNAP_ARCH
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH

cd $SNAP_USER_DATA

# Get the launch jar configuration
if [ -f ./launchjar.txt ]; then
    launchJar=`cat ./launchjar.txt`
else
    echo "server.jar" > launchjar.txt
    launchJar=`cat ./launchjar.txt`
fi
clear
# START THE INSTALLER
echo "--------------------------------"
echo ""
echo " Welcome to MC-SERVER-INSTALLER"
echo ""
echo "--------------------------------"
sleep 2s
echo "

"
echo "              NOTE"
echo "            --------"
echo "YOU MUST AGREE TO THE EULA PRIOR"
echo "    TO RUNNING THE SERVER"
echo "       FIRST TIME ONLY"
echo ""
sleep 3s

while [ answer != "0" ]  
do 

clear 
echo "-------------------------------------"
echo ""
echo "     MINECRAFT SERVER INSTALLER"
echo "               MENU              "
echo ""
echo "-------------------------------------"
echo "Launching from: "
echo $launchJar
echo ""
echo "Select from the following options: " 
echo ""
echo "1) Download latest server.jar"
echo "2) Agree to the EULA"
echo "3) Edit the server.properties file"
echo "4) Run MC server with max 2GB of RAM"
echo "5) Run MC server with max 4GB of RAM"
echo "6) Run MC server with max 6GB of RAM"
echo "7) Run MC server with max 8GB of RAM"
echo "8) Run MC server with max 16GB of RAM"
echo "9) Change launch jar"
echo "10) View README"
echo "11) Quit"
echo "" 
read -p "Choice: " answer 
clear
    case $answer in 
       1) echo "Downloading the latest server.jar..."
       echo "" 
       curl -so server.jar $JAR_URL 
       ;; 
       2) echo "Setting things up first..."
       echo ""
       java -Xmx2048M -Xms1024M -jar "$launchJar" nogui    
       echo "Agreeing to the EULA..."
       echo ""
       sed -ie s/false/true/g eula.txt
       echo ""
       echo "Done!"
       echo ""
       ;; 
       3) echo "Opening the server.properties file..."
       echo ""
       nano server.properties
       echo ""
       ;;
       4) echo "Starting server with 2GB of RAM..."
       echo $launchJar
       java -Xmx2048M -Xms1024M -jar "$launchJar" nogui
       ;; 
       5) echo "Starting server with 4GB of RAM..."
       echo ""
       java -Xmx4096M -Xms1024M -jar "$launchJar" nogui
       ;;
       6) echo "Starting server with 6GB of RAM..."
       echo ""
       java -Xmx6144M -Xms1024M -jar "$launchJar" nogui
       ;;
       7) echo "Starting server with 8GB of RAM..."
       echo ""
       java -Xmx8192M -Xms1024M -jar "$launchJar" nogui
       ;;
       8) echo "Starting server with 16GB of RAM..."
       echo ""
       java -Xmx16384M -Xms1024M -jar "$launchJar" nogui
       ;;
       9) read -p "Launch jar (server.jar): " launchJar
       echo $launchJar > ./launchjar.txt
       launchjar=`cat ./launchjar.txt`
       ;;
       10) echo ""
          echo "MC-SERVER-INSTALLER is not an officially"
          echo "supported or licensed application of "
          echo "Mojang."
          echo ""
          echo "The first time you run the installer,"
          echo "you'll need to download the .jar file"
          echo "(i.e. select option #1)." 
          echo "Now you may select option 2 to agree to" 
          echo "the EULA. You will never have to do this"
          echo "again, unless you remove the snap."
          echo ""
          echo "       NO. THIS WON'T BE CHANGED!" 
          echo "          BECAUSE LEGAL STUFF"
          echo ""
          echo "After selecting option #2, you can proceed"
          echo "with choosing any of the other options or"
          echo "setting up your server's configuration"
          echo "which is located in:"
          echo "~/snap/mc-server-installer/current"
          echo ""
          echo "Anytime you need to update the server.jar,"
          echo "just select option 1 again. No need to agree"
          echo "to the EULA"
          echo ""
          echo "This snap package was built from scratch"
          echo "with an MIT License, by kz6fittycent:"
          echo ""
          echo "github.com/kz6fittycent/mc-server-installer"
          echo ""
          ;;
       11) break ;; 
   esac  
   echo "press RETURN for menu" 
   read key 
done 
exit 0