Update container to stretch and use factorio user instead of root

Dockerfile

@@ -1,18 +1,27 @@
-FROM debian:jessie
+FROM debian:stretch
 EXPOSE 34197/udp
 
+ENV FACTORIO_VERSION 0.15.33
+
+ADD bin/entrypoint.sh /entrypoint.sh
+
 RUN \
   apt-get --yes update &&\
   apt-get --yes install wget xz-utils &&\
-  apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+  apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* &&\
+  adduser --disabled-password --gecos "" --home /opt/factorio factorio &&\
+  chmod 755 /entrypoint.sh &&\
+  mkdir -p /opt/factorio/headless /opt/factorio/saves &&\
+  chown -R factorio /opt/factorio
 
-WORKDIR /root/
+USER factorio
 RUN \
-  wget -O /tmp/headless.tgz https://www.factorio.com/get-download/0.15.5/headless/linux64 &&\
-  tar xfv /tmp/headless.tgz && rm /tmp/headless.tgz
+  wget -O /tmp/headless.tgz https://www.factorio.com/get-download/$FACTORIO_VERSION/headless/linux64 &&\
+  tar xfv /tmp/headless.tgz -C /opt/factorio/headless && rm /tmp/headless.tgz
 
-ADD bin/entrypoint.sh /entrypoint.sh
-ADD default-config.json config/default.json
+ADD default-config.json /opt/factorio/headless/factorio/config/default.json
+
+VOLUME /opt/factorio/saves
 
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["--server-settings", "config/default.json"]

bin/entrypoint.sh

@@ -1,10 +1,16 @@
 #!/bin/bash
 set -e
 
-FACTORIO_BIN=/root/factorio/bin/x64/factorio
-WORLDNAME=/root/saves/world.zip
+BASE_DIR=/opt/factorio
+
+RUN_DIR=${BASE_DIR}/headless/factorio
+
+FACTORIO_BIN=${RUN_DIR}/bin/x64/factorio
+WORLDNAME=${BASE_DIR}/saves/world.zip
 
 # Create savefile, if none exists
 [ ! -f ${WORLDNAME} ] && ${FACTORIO_BIN} --create ${WORLDNAME}
 
+cd ${RUN_DIR}
+
 exec ${FACTORIO_BIN} --start-server ${WORLDNAME} "$@"

docker-compose.yml

@@ -6,7 +6,7 @@ services:
         ports:
             - 34197:34197/udp
         volumes:
-            - world:/root/saves/
+            - world:/opt/factorio/saves/
 
 volumes:
     world: