Update Dockerfile to better pattern

Add requirements layer
Add entrypoint.sh script to support future CLI
Change Dockerfile to use ENTRYPOINT

Dockerfile

@@ -13,20 +13,37 @@
 # limitations under the License.
 FROM ubuntu:16.04
 
+ARG VERSION
+
 ENV DEBIAN_FRONTEND noninteractive
 ENV container docker
 
 RUN apt -qq update && \
-    apt -y install git netbase python3-minimal python3-setuptools python3-pip python3-dev ca-certificates gcc g++ make libffi-dev libssl-dev --no-install-recommends
+    apt -y install git \
+                   netbase \
+                   python3-minimal \
+                   python3-setuptools \
+                   python3-pip \
+                   python3-dev \
+                   ca-certificates \
+                   gcc \
+                   g++ \
+                   make \
+                   libffi-dev \
+                   libssl-dev --no-install-recommends
 
-# Need to configure proxies?
-
-RUN git clone https://github.com/sh8121att/drydock /tmp/drydock
+# Copy direct dependency requirements only to build a dependency layer
+COPY ./requirements-direct.txt /tmp/drydock/
+RUN pip3 install -r /tmp/drydock/requirements-direct.txt
 
+COPY . /tmp/drydock
 WORKDIR /tmp/drydock
-
 RUN python3 setup.py install
 
 EXPOSE 9000
 
-CMD ["/usr/bin/uwsgi","--http",":9000","-w","drydock_provisioner.drydock","--callable","drydock","--enable-threads","-L"]
+COPY examples/drydock.conf /etc/drydock/drydock.conf
+
+ENTRYPOINT ["./entrypoint.sh"]
+
+CMD ["server"]

entrypoint.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+CMD="drydock"
+PORT="8000"
+
+set -e
+
+if [ "$1" = 'server' ]; then
+    exec uwsgi --http :${PORT} -w drydock_provisioner.drydock --callable drydock --enable-threads -L --pyargv "--config-file /etc/drydock/drydock.conf"
+fi
+
+exec ${CMD} $@

requirements-direct.txt

@@ -0,0 +1,10 @@
+PyYAML
+pyghmi>=1.0.18
+netaddr
+falcon
+oslo.versionedobjects>=1.23.0
+requests
+oauthlib
+uwsgi>1.4
+bson===0.4.7
+oslo.config

requirements.txt

@@ -1,5 +0,0 @@
-PyYAML==3.12
-oauth==1.0.1
-requests-oauthlib==0.8.0
-netaddr==0.7.19
-python-libmaas==0.4.1