l4d2server.sh

#!/bin/bash

# You need the 32-bit libs installed!
# Fedoranoids: glibc.i686 libstdc++.i686
# Debianoids: lib32gcc1
# Also need tmux python3

set -x

steam_user="anonymous"
steam_pass=""
steam_workshopcollection="871935760"
server_hostname=;exit 1 # FILL IN!
server_rconpass=;exit 1 # FILL IN!
#server_motd="https://berigora.net/static/l4d2/motd.html"
server_motd="" # set to blank to suppress motd display;
server_banner="https://berigora.net/static/l4d2/banner.html"

rootdir="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
logdir="${rootdir}/logs"
steamcmddir="${rootdir}/steamcmd"
serverfiles="${rootdir}/serverfiles"
servercfgdir="${serverfiles}/left4dead2/cfg"
servercfg="server.cfg"
server_addondir="${serverfiles}/left4dead2/addons"
server_motdfile="custom_motd.txt"
server_bannerfile="custom_banner.txt"

fn_install() {
    cd "${rootdir}"

    mkdir -p "${steamcmddir}" "${serverfiles}" "${logdir}"
    curl -o - --progress-bar http://media.steampowered.com/client/steamcmd_linux.tar.gz | tar xvvz -C "${steamcmddir}"

    "${steamcmddir}/steamcmd.sh" +login "${steam_user}" "${steam_pass}" +force_install_dir "${serverfiles}" +app_update "222860" +quit
    "${steamcmddir}/steamcmd.sh" +login "${steam_user}" "${steam_pass}" +force_install_dir "${serverfiles}" +app_update "222860" validate +quit

    echo "${server_banner}" >"${serverfiles}/left4dead2/${server_bannerfile}"
    echo "${server_motd}" > "${serverfiles}/left4dead2/${server_motdfile}"

    cat >"${servercfgdir}/${servercfg}" <<SERVER_CONFIG
// Hostname for server.
hostname "${server_hostname}"

// RCON - remote console password.
rcon_password "${server_rconpass}"

// Server password - for private servers.
//sv_password ""

// Server Logging
log on
sv_logbans 1
sv_logecho 1
sv_logfile 1
sv_log_onefile 0

// Try to do something sensible about visibility
sv_lan 0
sv_allow_lobby_connect_only 0
sv_search_key "calraiths_holodeck"

// Decorate the banners
hostfile ${server_bannerfile}
motdfile ${server_motdfile}
SERVER_CONFIG

    if [ -n "$steam_workshopcollection" ]; then
        curl -L -o steam_workshop_downloader.py 'https://github.com/Geam/steam_workshop_downloader/raw/master/workshop.py'
        chmod +x steam_workshop_downloader.py
        ./steam_workshop_downloader.py -o "${server_addondir}" "${steam_workshopcollection}"
    fi
}

fn_install_rootpart() {
    yum install glibc.i686 libstdc++.i686 tmux python3
    adduser l4d2
    cp "${BASH_SOURCE[0]}" ~l4d2/l4d2server
    chmod +x ~l4d2/l4d2server
    cat >"/etc/systemd/system/l4d2server.service" <<SYSTEMD_UNIT
[Unit]
Description=Left 4 Dead 2 Dedicated Server
After=network.target

[Service]
Type=forking
User=l4d2
ExecStart=/home/l4d2/l4d2server start
ExecStop=/home/l4d2/l4d2server stop

[Install]
WantedBy=multi-user.target
SYSTEMD_UNIT
    systemctl daemon-reload
    systemctl enable l4d2server
}

fn_install_full() {
    sudo "${BASH_SOURCE[0]}" install_rootpart
    sudo -u l4d2 "${BASH_SOURCE[0]}" install
}

fn_start() {
    extip=$(curl -S http://169.254.169.254/latest/meta-data/public-ipv4)
    parms="-game left4dead2 -strictportbind -ip 0.0.0.0 -port 27015 -hostip ${extip} +clientport 27005 +map c5m1_waterfront +servercfgfile ${servercfg} -maxplayers 8"
    cd "${serverfiles}" || exit 2
    tmux new-session -d -s "l4d2server" "./srcds_run ${parms}"
    tmux pipe-pane -t "l4d2server" "exec cat >>'${logdir}/console.log'"
}

fn_stop() {
    tmux send-keys -t "l4d2server" Enter Q U I T Enter
}

case $1 in 
    "install_full")
        fn_install_full
        ;;
    "install_rootpart"
        fn_install_rootpart
        ;;
    "install")
        fn_install
        ;;
    "start")
        fn_start
        ;;
    "stop")
        fn_stop
        ;;
    *)
        echo "Unknown subcommand"
        exit 1
        ;;
esac