chore(Dockerfile): cleanup after installation a bit more than before and keep copyright / license files (#4)

Author: helgi

rootfs/Dockerfile

@@ -3,11 +3,27 @@ FROM quay.io/deis/base:v0.3.4
 COPY . /
 
 RUN apt-get update \
-	&& apt-get install -y redis-server \
-	--no-install-recommends \
-	&& apt-get clean \
-	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/man /usr/share/doc \
-	&& chown -R redis:redis /etc/redis /var/lib/redis /var/log/redis
+	apt-get install -y --no-install-recommends redis-server && \
+    chown -R redis:redis /etc/redis /var/lib/redis /var/log/redis && \
+    # cleanup
+    apt-get clean -y && \
+    # package up license files if any by appending to existing tar
+    COPYRIGHT_TAR='/usr/share/copyrights.tar'; \
+    gunzip $COPYRIGHT_TAR.gz; tar -rf $COPYRIGHT_TAR /usr/share/doc/*/copyright; gzip $COPYRIGHT_TAR && \
+    rm -rf \
+        /usr/share/doc \
+        /usr/share/man \
+        /usr/share/info \
+        /usr/share/locale \
+        /var/lib/apt/lists/* \
+        /var/log/* \
+        /var/cache/debconf/* \
+        /etc/systemd \
+        /lib/lsb \
+        /lib/udev \
+        /usr/lib/x86_64-linux-gnu/gconv/IBM* \
+        /usr/lib/x86_64-linux-gnu/gconv/EBC* && \
+    bash -c "mkdir -p /usr/share/man/man{1..8}"
 
 USER redis
 WORKDIR /var/lib/redis