Added feature alpine with ssl verification and sha1 verification of the image

Dockerfile

@@ -1,34 +1,27 @@
-FROM debian:latest
+FROM frolvlad/alpine-glibc:alpine-3.3_glibc-2.23
 
 MAINTAINER zopanix <zopanix@gmail.com>
 
 WORKDIR /opt
 
 COPY ./smart_launch.sh /opt
+COPY ./factorio.crt /opt
 
-CMD ["./smart_launch.sh"]
+VOLUME /opt/factorio/saves /opt/factorio/mods
+
+ENV FACTORIO_AUTOSAVE_INTERVAL 2 \
+    FACTORIO_AUTOSAVE_SLOTS 3 \
+    FACTORIO_DISSALOW_COMMANDS true \
+    FACTORIO_NO_AUTO_PAUSE false \
+    VERSION=0.12.30 \
+    FACTORIO_SHA1=77d92ecc52989f3283462fd5c9b5ba07eb6081cc
+
+RUN apk --update add bash curl && \
+    curl -sSL --cacert /opt/factorio.crt https://www.factorio.com/get-download/$VERSION/headless/linux64 -o /tmp/factorio_headless_x64_$VERSION.tar.gz && \
+    echo "$FACTORIO_SHA1  /tmp/factorio_headless_x64_$VERSION.tar.gz" | sha1sum -c && \
+    tar xzf /tmp/factorio_headless_x64_$VERSION.tar.gz && \
+    rm /tmp/factorio_headless_x64_$VERSION.tar.gz
 
 EXPOSE 34197/udp
 
-VOLUME "/opt/factorio/saves"
-
-VOLUME "/opt/factorio/mods"
-
-ENV FACTORIO_AUTOSAVE_INTERVAL 2
-
-ENV FACTORIO_AUTOSAVE_SLOTS 3
-
-ENV FACTORIO_DISSALOW_COMMANDS true
-
-ENV FACTORIO_NO_AUTO_PAUSE false
-
-RUN echo "# Installing curl" && \
-    apt-get update && \
-    apt-get install -y curl && \
-    echo "# Downloading and unzipping factorio" && \
-    curl -L -k https://www.factorio.com/get-download/0.12.30/headless/linux64 | tar -xzf - && \
-    echo "# Cleaning" && \
-    apt-get remove -y --purge curl  && \
-    apt-get autoremove -y --purge && \
-    apt-get clean && \
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+CMD ["./smart_launch.sh"]

README.md

@@ -9,12 +9,9 @@ Current Version
 #### Factorio
 See [factorio's site](http://www.factorio.com)
 #### Docker image
-* Added possibility to add the no-auto-pause option
-* Added possibility to allow commands in game
-* Automatically takes latest save or autosave. when restarting the container.
-* Added possibility to change default autosave interval
-* Added possibility to change default autosave slots
-* Added possibility to mount a mod volume to have your mods in your multiplayer session
+Next feature come from dtandersen's fork:
+* Image based on alpine (makes the image more lightweight)
+* SSL verification when downloading game
 
 Versions
 -----

factorio.crt

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