startserverlinux.sh file

#!/bin/bash

#### Minecraft-Forge Server install/launcher script
#### Linux Version
####
#### Created by: Dijkstra
#### Mascot: Ordinator
####
#### Originally created for use in "All The Mods" modpacks
#### NO OFFICIAL AFFILIATION WITH MOJANG OR FORGE
####
#### This script will fetch the appropriate forge installer
#### and run it to install forge AND fetch Minecraft (from Mojang)
#### If Forge and Minecraft are already installed it will skip
#### download/install and launch server directly (with
#### auto-restart-after-crash logic as well)
####
#### Make sure this is running as BASH
#### You might need to chmod +x before executing
####
#### IF THERE ARE ANY ISSUES
#### Please make a report on the AllTheMods github:
#### https://github.com/whatthedrunk/allthemods/issues
#### with the contents of [serverstart.log] and [installer.log]
####
#### or come find us on Discord: https://discord.gg/FdFDVWb
####


#For Server Owners


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# Internal scripty stuff from here on out
# No lines intended to be edited past here
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# Make sure users aren't trying to run script via sh directly (won't work)

unameOut="$(uname -s)"
case "${unameOut}" in
    Linux*)     machine=Linux;;
    Darwin*)    machine=Mac;;
    CYGWIN*)    machine=Cygwin;;
    MINGW*)     machine=MinGw;;
    *)          machine="UNKNOWN:${unameOut}"
esac

if [ ! "$BASH_VERSION" ] ; then
    echo "Please do not use sh to run this script ($0). Use bash instead (or execute it directly)" 1>&2
    exit 1
fi

# routine to handle Forge/server install
install_server(){
    echo "Starting install of Forge/Minecraft server binaries"
    echo "DEBUG: Starting install of Forge/Minecraft server binaries" >>serverstart.log 2>&1
    if [ -f installer.jar ]; then
        echo "DEBUG: installer.jar found in current directory" >>serverstart.log 2>&1
        export answer="n"
        read -t 8 -p "Installer found. Use it (y) or download again (n)?  " answer
        if [[ "$answer" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
            echo "INFO: Skipping download. Using existing installer.jar" >>serverstart.log 2>&1
            echo "Skipping download. Using existing installer.jar"
        fi
    else
        if [ "${FORGEURL}" = "DISABLE" ]; then
            export URL="http://files.minecraftforge.net/maven/net/minecraftforge/forge/${MCVER}-${FORGEVER}/forge-${MCVER}-${FORGEVER}-installer.jar"
        else
            export URL="${FORGEURL}"
        fi
        echo $URL
        which wget >> /dev/null
        if [ $? -eq 0 ]; then
            echo "DEBUG: (wget) Downloading ${URL}" >>serverstart.log 2>&1
            wget -O installer.jar "${URL}" >>serverstart.log 2>&1
        else
            which curl >> /dev/null
            if [ $? -eq 0 ]; then
                echo "DEBUG: (curl) Downloading ${URL}" >>serverstart.log 2>&1
                curl -o installer.jar "${URL}" >>serverstart.log 2>&1
            else
                echo "Neither wget or curl were found on your system. Please install one and try again"
                echo "ERROR: Neither wget or curl were found" >>serverstart.log 2>&1
            fi
        fi
    fi

    if [ ! -f installer.jar ]; then
        echo "Forge installer did not download"
        echo "ERROR: Forge installer did not download" >>serverstart.log 2>&1
        exit 0
    else
        echo "Moving unneeded files/folders to ./DELETEME"
        echo "INFO: Moving unneeded files/folders to ./DELETEME" >>serverstart.log 2>&1
        rm -rf ./DELETEME >>serverstart.log 2>&1
        mv -f ./asm ./DELETEME >>serverstart.log 2>&1
        mv -f ./libraries ./DELETEME >>serverstart.log 2>&1
        mv -f ./llibrary ./DELETEME >>serverstart.log 2>&1
        mv -f ./minecraft_server*.jar ./DELETEME >>serverstart.log 2>&1
        mv -f ./forge*.jar ./DELETEME >>serverstart.log 2>&1
        mv -f ./OpenComputersMod*lua* ./DELETEME >>serverstart.log 2>&1
        echo "Installing Forge Server, please wait..."
        echo "INFO: Installing Forge Server" >>serverstart.log 2>&1
        java -jar installer.jar --installServer >>serverstart.log 2>&1
        echo "Deleting Forge installer (no longer needed)"
        echo "INFO: Deleting installer.jar" >>serverstart.log 2>&1
        rm -rf installer.jar  >>serverstart.log 2>&1
    fi
}

# routine to [re]start Forgemodded minecraft server
start_server() {
    echo ""
    echo ""
    echo "Starting server"
    echo "INFO: Starting Server at " $(date -u +%Y-%m-%d_%H:%M:%S) >>serverstart.log 2>&1
    java -Xmx${MAX_RAM} ${JAVA_ARGS} -jar forge-${MCVER}-${FORGEVER}-universal.jar nogui
}

# routine for basic directory checks
check_dir(){
    echo "DEBUG: Current directory is " $(pwd) >>serverstart.log 2>&1
    if [ "$(pwd)" = "/tmp" ] || [ "$(pwd)" = "/var/tmp" ]; then
        echo "Current directory appears to be TMP"
        echo "WARN: Current DIR is TEMP"  >>serverstart.log 2>&1
        if [ ${RUN_FROM_BAD_FOLDER} -eq 0 ]; then
            echo "ERROR: Stopping due to bad folder (TMP)" >>serverstart.log 2>&1
            echo "RUN_FROM_BAD_FOLDER setting is off, exiting script"
            exit 0
        else
            echo "WARN: Bad folder (TMP) but continuing anyway" >>serverstart.log 2>&1
            echo "Bypassing cd=temp halt per script settings"
        fi
    fi

    if [ ! -r . ] || [ ! -w . ]; then
    echo "WARN: Not full R/W access on current directory"
    echo "You do not have full R/W access to current directory"
        if [ ${RUN_FROM_BAD_FOLDER} -eq 0 ]; then
        echo "ERROR: Stopping due to bad folder (R/W access)" >>serverstart.log 2>&1
        echo "RUN_FROM_BAD_FOLDER setting is off, exiting script"
        exit 0
        else
        echo "WARN: Bad folder (R/W) cut continuing anyway" >>serverstart.log 2>&1
        echo "Bypassing no R/W halt (per script settings)"
        fi
    fi
}

# routine for ping inet connectivity
check_connection(){
    if [ ${IGNORE_OFFLINE} -eq 1 ]; then
        echo "WARN: Internet connectivity checking is disabled" >>serverstart.log 2>&1
        echo "Skipping internet connectivity check"
    else
        if ping -c 1 8.8.8.8 >> /dev/null 2>&1; then
            echo "INFO: Ping to Google DNS successfull" >>serverstart.log 2>&1
            echo "Ping to Google DNS successfull"
        else
            echo "ERROR: Ping to Google DNS failed. No internet access?" >>serverstart.log 2>&1
            echo "Ping to Google DNS failed. No internet access?"
        fi

        if ping -c 1 4.2.2.1 >> /dev/null 2>&1; then
            echo "INFO: Ping to L4 successfull" >>serverstart.log 2>&1
            echo "Ping to L4 successfull"
        else
            echo "ERROR: Ping to L4 failed. No internet access?"  >>serverstart.log 2>&1
            echo "Ping to L4 failed. No internet access?"
            exit 0
        fi
    fi
}

# routine to make sure necessary binaries are found
check_binaries(){
    if [ ! -f ${FORGE_JAR} ] ; then
        echo "WARN: ${FORGE_JAR} not found"  >>serverstart.log 2>&1
        echo "Required files not found, need to install Forge"
        install_server
    fi
    if [ ! -f ./minecraft_server.${MCVER}.jar ] ; then
        echo "WARN: minecraft_server.${MCVER}.jar not found" >>serverstart.log 2>&1
        echo "Required files not found, need to install Forge"
        install_server
    fi
    if [ ! -d ./libraries ] ; then
        echo "WARN: library directory not found" >>serverstart.log 2>&1
        echo "Required files not found, need to install Forge"
        install_server
    fi
}

read_config(){
    while read -r line || [[ -n "$line" ]] ; do
        if echo $line | grep -F = &>/dev/null; then
            if [[ ${str:0:1} != "#" ]] ; then
                name=$(echo "$line" | cut -d '=' -f 1)
                val=$(echo "${line}" | cut -d '=' -f 2-)
                eval "export ${name}='${val%?}'"
            fi
        fi
    done < settings.cfg

}

eula(){
    if [ ! -f eula.txt ]; then
        echo "Could not find eula.txt starting server to generate it"
        start_server
        echo ""
        echo "Closing to give user a change to accept the eula"
        exit 0
    else
        if grep -Fxq "eula=false" eula.txt; then
            echo "Could not find 'eula=true' in 'eula.txt'"
            echo "Closing to give user a change to accept the eula"
            exit 0
        fi
    fi
}

read_config

# Script/batch starts here...

# init log file and dump basic info
echo "INFO: Starting script at" $(date -u +%Y-%m-%d_%H:%M:%S) >serverstart.log 2>&1
echo "DEBUG: Dumping starting variables: " >>serverstart.log 2>&1
echo "DEBUG: MAX_RAM=$MAX_RAM" >>serverstart.log 2>&1
echo "DEBUG: JAVA_ARGS=$JAVA_ARGS" >>serverstart.log 2>&1
echo "DEBUG: CRASH_COUNT=$CRASH_COUNT" >>serverstart.log 2>&1
echo "DEBUG: RUN_FROM_BAD_FOLDER=$RUN_FROM_BAD_FOLDER" >>serverstart.log 2>&1
echo "DEBUG: IGNORE_OFFLINE=$IGNORE_OFFLINE" >>serverstart.log 2>&1
echo "DEBUG: MCVER=$MCVER" >>serverstart.log 2>&1
echo "DEBUG: FORGEVER=$FORGEVER" >>serverstart.log 2>&1
echo "DEBUG: FORGEURL=$FORGEURL" >>serverstart.log 2>&1
echo "DEBUG: Basic System Info: " $(uname -a) >>serverstart.log 2>&1
if [ "$machine" = "Mac" ]
then
  echo "DEBUG: Total RAM estimate: " $(sysctl hw.memsize | awk 'BEGIN {total = 1} {if (NR == 1 || NR == 3) total *=$NF} END {print total / 1024 / 1024" MB"}') >>serverstart.log 2>&1
else
  echo "DEBUG: Total RAM estimate: " $(getconf -a | grep PAGES | awk 'BEGIN {total = 1} {if (NR == 1 || NR == 3) total *=$NF} END {print total / 1024 / 1024" MB"}') >>serverstart.log 2>&1
fi
echo "DEBUG: Java Version info: " $(java -version) >>serverstart.log 2>&1
echo "DEBUG: Dumping current directory listing " >>serverstart.log 2>&1
ls -s1h >>serverstart.log 2>&1

export answer="n"
echo ""
read -t 6 -p "About to start server. Force re-install (y/n)?  " answer
if [[ "$answer" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
    echo "INFO: User chose to manually re-install server files"  >>serverstart.log 2>&1
    echo "User chose to manually re-install server files"
    install_server
fi

check_dir
check_connection
check_binaries
eula

# loop to restart server and check crash frequency
a=0
last_crash=$((SECONDS))
while true ; do
    start_server
    b=$?
    if [ "$b" -eq "0" ]; then
        a=0
    else
        now=$((SECONDS))
        diff=$(($now-$last_crash))
        if [ "$diff" -gt "3600" ]; then
            a=1
            else
            a=$((a+1))
        fi
        last_crash=$((SECONDS))
    fi
    if [ "$a" -eq ${CRASH_COUNT} ]; then
        echo "The server has crashed to many times"
        echo "ERROR: Server has failed too start too many times in a row." >>serverstart.log 2>&1
        exit 0
    fi

    export answer="y"
    echo "Server will restart in ~10 seconds. No input needed..."
    read -t 12 -p "Restart now (y) or exit to shell (n)?  " answer
    if [[ "$answer" =~ ^([nN][oO]|[nN])+$ ]]; then
        echo "INFO: User cancelled restart; exiting to shell" >>serverstart.log 2>&1
        exit 0
    fi

    #re-validate stuff each server restart
    check_dir
    check_connection
    check_binaries
    eula
    echo "INFO: Server-auto-restart commencing"  >>serverstart.log 2>&1
    echo "Rebooting now!"
done