eggs/scripts/steamcmd_installer.sh

#!/bin/bash
# steamcmd Base Installation Script
#
# Server Files: /mnt/server
# Image to install with is 'debian:buster-slim'

##
#
# Variables
# STEAM_USER, STEAM_PASS, STEAM_AUTH - Steam user setup. If a user has 2fa enabled it will most likely fail due to timeout. Leave blank for anon install.
# WINDOWS_INSTALL - if it's a windows server you want to install set to 1
# SRCDS_APPID - steam app id ffound here - https://developer.valvesoftware.com/wiki/Dedicated_Servers_List
# INSTALL_FLAGS - when a server has extra glas for things like beta installs or updates.
#
##

apt -y update
apt -y --no-install-recommends install curl lib32gcc1 ca-certificates

## just in case someone removed the defaults.
if [[ "${STEAM_USER}" == "" ]] || [[ "${STEAM_PASS}" == "" ]]; then
    echo -e "steam user is not set.\n"
    echo -e "Using anonymous user.\n"
    STEAM_USER=anonymous
    STEAM_PASS=""
    STEAM_AUTH=""
else
    echo -e "user set to ${STEAM_USER}"
fi

## download and install steamcmd
cd /tmp
mkdir -p /mnt/server/steamcmd
curl -sSL -o steamcmd.tar.gz https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz
tar -xzvf steamcmd.tar.gz -C /mnt/server/steamcmd
mkdir -p /mnt/server/steamapps # Fix steamcmd disk write error when this folder is missing
cd /mnt/server/steamcmd

# SteamCMD fails otherwise for some reason, even running as root.
# This is changed at the end of the install process anyways.
chown -R root:root /mnt
export HOME=/mnt/server

## install game using steamcmd
./steamcmd.sh +login ${STEAM_USER} ${STEAM_PASS} ${STEAM_AUTH} $( [[ "${WINDOWS_INSTALL}" == "1" ]] && printf %s '+@sSteamCmdForcePlatformType windows' ) +force_install_dir /mnt/server +app_update ${SRCDS_APPID} ${INSTALL_FLAGS} validate +quit ## other flags may be needed depending on install. looking at you cs 1.6

## set up 32 bit libraries
mkdir -p /mnt/server/.steam/sdk32
cp -v linux32/steamclient.so ../.steam/sdk32/steamclient.so

## set up 64 bit libraries
mkdir -p /mnt/server/.steam/sdk64
cp -v linux64/steamclient.so ../.steam/sdk64/steamclient.so