Utilise multi-stage docker build for consistent dev/prod base

* developers can use --target symposion_dev to get a responsive site
  that reads from their homedir and reacts to changed files instantly
* without a specified target the default is to build the prod image,
  which is identical except for running uwsgi instead of the django
  built-in server
* Enable debug when running in a developer's test environment
* Remove the makemigrations script and dockerfile

.dockerignore

@@ -1,2 +1,3 @@
 .git
-ve
+symposion-fixtures
+

README.rst

@@ -64,10 +64,11 @@ Making migrations
 
 If you make changes to the data model, you'll need to run "manage.py
 makemigrations" to create a matching migration file. If you're on a
-mac, or a system without python3, this can be difficult. In such a
-case, the ``makemigrations.sh`` script takes advantaged of a docker
-container that's slightly modified, and runs the makemigration action
-on the files in your working directory.
+mac, or a system without python3, this can be difficult.
+
+In such a case, you can use the above script to make and run a dev
+container; then::
+    docker exec -it symposion ./manage.py makemigrations
 
 
 Running a dev instance in a VirtualEnv

docker/Dockerfile

@@ -1,5 +1,4 @@
-FROM python:3.6
-
+FROM python:3.6 as symposion_base
 
 RUN set -ex \
     && apt-get update
@@ -41,4 +40,10 @@ RUN set -x \
     && DJANGO_SECRET_KEY=1234 STRIPE_PUBLIC_KEY=1234 STRIPE_SECRET_KEY=1234 \
        DATABASE_URL="sqlite:////dev/null" \
        python manage.py collectstatic --noinput -l -v 0
+
+FROM symposion_base as symposion_dev
+VOLUME /app/symposion_app
+CMD ["./manage.py", "runserver", "-v3", "0.0.0.0:8000"]
+
+FROM symposion_base as symposion_prod
 CMD ["/usr/local/bin/uwsgi", "--http-socket", "0.0.0.0:8000", "--wsgi-file", "pinaxcon/wsgi.py"]

docker/Dockerfile.makemigrations

@@ -1,25 +0,0 @@
-FROM python:3.6
-VOLUME /source
-COPY constraints.txt requirements.txt /setup/
-RUN set -ex \
-    && buildDeps=' \
-        libmysqlclient-dev \
-        libffi-dev \
-        libfreetype6-dev \
-        libjpeg-dev \
-        libwebp-dev \
-        libpng-dev \
-        liblcms2-dev \
-        zlib1g-dev \
-        libmemcached-dev \
-        libsasl2-dev \
-    ' \
-    && apt-get update \
-    && apt-get install -y git xmlsec1 libmysqlclient18 \
-    && apt-get install -y $buildDeps --no-install-recommends
-RUN pip install -c /setup/constraints.txt -r /setup/requirements.txt
-COPY . /source
-WORKDIR /source
-RUN pip install -c /setup/constraints.txt -r /source/vendored_requirements.txt
-ENTRYPOINT ["python","/source/manage.py", "makemigrations"]
-

docker/laptop-mode-env

@@ -5,3 +5,4 @@ GCS_BUCKET=5CEA51A5-A613-4AEF-A9FB-D0A57D77C13B
 GOOGLE_APPLICATION_CREDENTIALS=/dev/null
 DATABASE_URL=sqlite:////tmp/symposion.sqlite
 SYMPOSION_DEV_MODE=LAPTOP
+SYMPOSION_APP_DEBUG=1

make_dev_container.sh

@@ -2,10 +2,10 @@
 
 CONTAINER_NAME=${1:-symposion_app}
 
-docker image build -f docker/Dockerfile -t ${CONTAINER_NAME} .
+docker image build -f docker/Dockerfile -t ${CONTAINER_NAME} --target symposion_dev .
 docker container stop symposion
 docker container rm symposion
-docker container create --env-file docker/laptop-mode-env -p 28000:8000 --name symposion ${CONTAINER_NAME}
+docker container create --env-file docker/laptop-mode-env -p 28000:8000 -v $(pwd):/app/symposion_app --name symposion ${CONTAINER_NAME}
 docker container start symposion
 docker exec symposion ./manage.py migrate
 docker exec symposion ./manage.py loaddata ./fixtures/*.json

makemigrations.sh

@@ -1,4 +0,0 @@
-#!/bin/bash -x
-docker image build -f docker/Dockerfile.makemigrations -t makemigrations .
-docker run -it --env-file=docker/laptop-mode-env -v $(pwd):/source makemigrations $*
-