Simple updater for a headless Factorio server

update_factorio_server.sh

#!/usr/bin/env bash
set -Eeuo pipefail

new_version=$(
  curl -fsL https://updater.factorio.com/get-available-versions |
  jq -r '."core-linux_headless64"[].to|select(.)' |
  python -c'import sys;v=max(sys.stdin,key=lambda x:tuple(map(int,x.split("."))));print(v.strip())'
)

cur_version=$(cat $HOME/factorio/.cur-version || true)

if [[ $cur_version != $new_version ]]; then
    cd
    curl -fL "https://www.factorio.com/get-download/${new_version}/headless/linux64" | tar xpJv
    echo "$new_version" > $HOME/factorio/.cur-version
    kill -1 $(pgrep factorio) # Assuming the server is set up to start again after shutdown
fi