Multi-stage build

Dockerfile

@@ -1,3 +1,10 @@
+FROM mrvercetti/steamcmd as builder
+
+# Download Sven Co-Op server
+RUN ${STEAMCMD_DIR}/steamcmd.sh +login anonymous +force_install_dir ${OUTPUT_DIR} +app_update 276060 validate +quit && \
+    echo "225840" > ${OUTPUT_DIR}/steam_appid.txt
+
+# Fresh start
 FROM debian:stable-slim
 LABEL maintainer="mr-vercetti"
 
@@ -10,10 +17,10 @@ RUN dpkg --add-architecture i386 && \
         locale-gen --no-purge en_US.UTF-8 && \
     apt-get clean && rm -rf /tmp/* /var/lib/apt/lists/* /var/tmp/*
 
+# General variables
 ENV LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8
-ENV APP_DIR="/app"
-ENV STEAMCMD_DIR="${APP_DIR}/Steam/steamcmd"
-ENV SERVER_DIR="${APP_DIR}/server"
+ENV SERVER_DIR="/svencoop-server"
+ENV OUTPUT_DIR="/output"
 # Startup variables
 ENV GAME_PARAMS="-num_edicts 3072 +sv_lan 1 -port 27015 -console -debug;"
 ENV GAME_NAME=""
@@ -21,26 +28,19 @@ ENV GAME_PASSWORD=""
 
 # Set up user environment
 RUN groupadd -r abc && \
-    useradd -d ${APP_DIR} -r -g abc abc && \
-    mkdir -p ${SERVER_DIR} ${STEAMCMD_DIR} && \
-    chown -R abc:abc ${APP_DIR}
-
-ADD --chown=abc:abc --chmod=755 /scripts/start.sh /
+    useradd -d ${SERVER_DIR} -r -g abc abc && \
+    mkdir -p ${SERVER_DIR} && \
+    chown -R abc:abc ${SERVER_DIR}
 
 USER abc
-WORKDIR ${APP_DIR}
+WORKDIR ${SERVER_DIR}
 
-# Download and update steamcmd
-RUN wget -qO- http://media.steampowered.com/installer/steamcmd_linux.tar.gz | tar xz -C ${STEAMCMD_DIR} && \
-    chmod +x ${STEAMCMD_DIR}/steamcmd.sh && \
-    ${STEAMCMD_DIR}/steamcmd.sh +force_install_dir ${STEAMCMD_DIR} +login anonymous +quit
-
-# Download Sven Co-Op server
-RUN ${STEAMCMD_DIR}/steamcmd.sh +login anonymous +force_install_dir ${SERVER_DIR} +app_update 276060 validate +quit && \
-    echo "225840" > ${SERVER_DIR}/steam_appid.txt
+# Copy needed files
+COPY --chown=abc:abc --chmod=755 /scripts/start.sh /
+COPY --chown=abc:abc --from=builder ${OUTPUT_DIR} ${SERVER_DIR}
 
 # Link steamclient.so to prevent srcds_run errors
-RUN mkdir -p ${APP_DIR}/.steam/sdk32 && \
-    ln -s ${SERVER_DIR}/steamclient.so ${APP_DIR}/.steam/sdk32/steamclient.so
+RUN mkdir -p ${SERVER_DIR}/.steam/sdk32 && \
+    ln -s ${SERVER_DIR}/steamclient.so ${SERVER_DIR}/.steam/sdk32/steamclient.so
 
-ENTRYPOINT ["/start.sh"]
+ENTRYPOINT ["/start.sh"]