make dockerfile more configurable

Author: shivnagarajan

mcrouter/scripts/docker/Dockerfile

@@ -1,17 +1,22 @@
-FROM            ubuntu:14.04
+ARG             UBUNTU_VERSION=14.04
+FROM            ubuntu:${UBUNTU_VERSION}
 
 MAINTAINER      mcrouter <mcrouter@fb.com>
 
 ENV             MCROUTER_DIR            /usr/local/mcrouter
 ENV             MCROUTER_REPO           https://github.com/facebook/mcrouter.git
 ENV             DEBIAN_FRONTEND         noninteractive
 
-RUN             apt-get update && apt-get install -y git && \
+ARG             UBUNTU_VERSION
+ARG             RELEASE_REV=master
+RUN             apt-get update && apt-get install -y software-properties-common git sudo && \
+                add-apt-repository ppa:george-edison55/cmake-3.x && \
                 mkdir -p $MCROUTER_DIR/repo && \
                 cd $MCROUTER_DIR/repo && git clone $MCROUTER_REPO && \
+                cd $MCROUTER_DIR/repo/mcrouter && git checkout ${RELEASE_REV} && \
                 cd $MCROUTER_DIR/repo/mcrouter/mcrouter/scripts && \
-                ./install_ubuntu_14.04.sh $MCROUTER_DIR && \
-                ./clean_ubuntu_14.04.sh $MCROUTER_DIR && rm -rf $MCROUTER_DIR/repo && \
+                ./install_ubuntu_${UBUNTU_VERSION}.sh $MCROUTER_DIR && \
+                { ./clean_ubuntu_${UBUNTU_VERSION}.sh $MCROUTER_DIR || true ; } && rm -rf $MCROUTER_DIR/repo && \
                 ln -s $MCROUTER_DIR/install/bin/mcrouter /usr/local/bin/mcrouter
 
 ENV             DEBIAN_FRONTEND newt