Dockerfile

# Builds from an official Docker image
FROM ubuntu:14.04.1


# Installing Make, G++, and wget
# (wget is required to download the snap package)
RUN apt-get update && \
    DEBIAN_FRONTEND=noninteractive apt-get install -y make g++ wget && \
    rm -rf /var/lib/apt/lists/*


# Environment variables
ENV ZLIB_VERSION	1.2.8
ENV SNAP_VERSION	1.0beta.15
ENV SNAP_HOME		/usr/local/snap


# Installing ZLIB
RUN wget http://zlib.net/zlib-$ZLIB_VERSION.tar.gz  && \
    tar -xzf /zlib-$ZLIB_VERSION.tar.gz -C /usr/local/  && \
    rm /zlib-$ZLIB_VERSION.tar.gz  && \
    ln -s /usr/local/zlib-$ZLIB_VERSION /usr/local/zlib  && \
    cd /usr/local/zlib  && \
    ./configure  && \
    make
# Docker's RUN command prepends 'sh -c' to the RUN instruction, which caues the error
#
#   /bin/sh: 1:  : not found
#
# This forces us to do the 'make install' in a separate RUN instruction
# Using the brackets does not prepend 'sh -c'
#
RUN ["make", "-C", "/usr/local/zlib", "install"]


# Installing Snap
RUN wget http://snap.cs.berkeley.edu/downloads/snap-$SNAP_VERSION-linux.tar.gz  && \
    tar -xzf /snap-$SNAP_VERSION-linux.tar.gz -C /usr/local/  && \
    rm /snap-$SNAP_VERSION-linux.tar.gz  && \
    ln -s /usr/local/snap-$SNAP_VERSION-linux /usr/local/snap  && \
    ln -s /usr/local/snap/snap /usr/bin/snap


# Define the default command
ENTRYPOINT ["snap"]