Dockerfile download hashsum install

Dockerfile

FROM debian:wheezy

ENV RIAKCS_DOWNLOAD_SHA1=caae1342618958fc9c1bc7e79a8596ca27866b3a
ENV RIAKCS_DOWNLOAD_URL=http://s3.amazonaws.com/downloads.basho.com/riak-cs/2.0/2.0.0/debian/7/riak-cs_2.0.0-1_amd64.deb

RUN buildDeps='curl gdebi-core'; \
    set -x \
    && apt-get update \
    && apt-get install -y $buildDeps --no-install-recommends \
    && curl -sSL "$RIAKCS_DOWNLOAD_URL" -o riakcs.deb \
    && echo "$RIAKCS_DOWNLOAD_SHA1 *riakcs.deb" | sha1sum -c - \
    && gdebi riakcs.deb \
    && rm riakcs.deb \
    && apt-get purge -y --auto-remove $buildDeps \
    && rm -rf /var/lib/apt/lists/*