[PATCH 3/3] docker: Use pyenv for Python versions

[Stephen Finucane]

This is slightly slower to initially configure but requires less hacking
to get the same environment and should be a lot more maintainable (just
a simple modification to change the Python version).

Signed-off-by: Stephen Finucane <stephen at that.guru>
---
 tools/docker/Dockerfile        | 79 ++++++++++++++++++----------------
 tools/docker/entrypoint.sh     | 10 ++---
 tools/docker/xenial-ports.list |  3 --
 tools/docker/xenial.list       |  3 --
 4 files changed, 47 insertions(+), 48 deletions(-)
 delete mode 100644 tools/docker/xenial-ports.list
 delete mode 100644 tools/docker/xenial.list

diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index 556085ce..35324b13 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -1,54 +1,59 @@
 FROM ubuntu:18.04
 
 ARG UID
-ARG TZ="Australia/Canberra"
+
+# make sure the user has configured the '.env' file and quick fail if not
 
 RUN echo $UID
 RUN [ -n "$UID" ] || { echo "You must define UID in .env" 1>&2; exit 1; }
 
-ENV PROJECT_HOME /home/patchwork/patchwork
-
-ENV DJANGO_SETTINGS_MODULE patchwork.settings.dev
+ARG TZ="Australia/Canberra"
+ENV LANG="C.UTF-8"
+ENV LC_ALL="C.UTF-8"
+ENV PATH="/opt/pyenv/shims:/opt/pyenv/bin:$PATH"
+ENV PYENV_ROOT="/opt/pyenv"
+ENV PYENV_SHELL="bash"
 ENV DEBIAN_FRONTEND noninteractive
 ENV PYTHONUNBUFFERED 1
+ENV PROJECT_HOME /home/patchwork/patchwork
+ENV DJANGO_SETTINGS_MODULE patchwork.settings.dev
 
-
-# System
-# xenial is for python3.5
-# TODO(stephenfin): Are curl, unzip required?
-COPY tools/docker/*.list /etc/apt/sources.list.d/
-
-RUN cd /etc/apt/sources.list.d; \
-    echo $(uname -m) > /tmp/arch; \
-    if [ $(cat /tmp/arch) != 'x86_64' ] && grep -q -v "i.86" /tmp/arch; then \
-        mv xenial-ports.list xenial.list; \
-    else \
-        rm *-ports.list; \
-    fi
-
-RUN apt-get update -qq && \
-    apt-get install -y --no-install-recommends --allow-downgrades \
-    python-dev python-pip python-setuptools python-wheel \
-    python3.5-dev python3-pip python3-setuptools python3-wheel \
-    python3.6-dev \
-    libmysqlclient-dev mysql-client curl unzip build-essential \
-    git postgresql-client tzdata libpq-dev
-
-# User
 RUN useradd --uid=$UID --create-home patchwork
-
-# Timezone
 RUN rm /etc/localtime; ln -s /usr/share/zoneinfo/$TZ /etc/localtime
 
-# Python requirements.
-# If you update requirements, you should rebuild the container.
-# entrypoint.sh will prompt you to do this.
-# we install both Python 2 and Python 3 versions so you can use either
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    ca-certificates \
+    curl \
+    git \
+    libbz2-dev \
+    libffi-dev \
+    libmysqlclient-dev \
+    libpq-dev \
+    libreadline-dev \
+    libsqlite3-dev \
+    libssl1.0-dev \
+    mysql-client \
+    postgresql-client \
+    tzdata \
+    zlib1g-dev \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN curl -L https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer | bash && \
+    git clone https://github.com/momo-lab/xxenv-latest $PYENV_ROOT/plugins/xxenv-latest && \
+    pyenv update
+
+RUN pyenv latest install 2.7 && \
+    pyenv latest install 3.5 && \
+    pyenv latest install 3.6 && \
+    pyenv latest install 3.7
+
+RUN pyenv global $(pyenv versions --bare | tac)
+
 COPY requirements-*.txt /tmp/
-RUN pip3 install virtualenv tox && \
-    pip3 install -r /tmp/requirements-dev.txt
-RUN pip2 install virtualenv tox && \
-    pip2 install -r /tmp/requirements-dev.txt
+RUN pip install tox tox-pyenv && \
+    pip install -r /tmp/requirements-dev.txt
+
 # we deliberately leave the requirements files in tmp so we can
 # ping the user in entrypoint.sh if the change them!
 
diff --git a/tools/docker/entrypoint.sh b/tools/docker/entrypoint.sh
index 08fa1906..456d640d 100755
--- a/tools/docker/entrypoint.sh
+++ b/tools/docker/entrypoint.sh
@@ -46,10 +46,10 @@ reset_data() {
     fi
 
     # load initial data
-    python3 $PROJECT_HOME/manage.py migrate #> /dev/null
-    python3 $PROJECT_HOME/manage.py loaddata default_tags #> /dev/null
-    python3 $PROJECT_HOME/manage.py loaddata default_states #> /dev/null
-    python3 $PROJECT_HOME/manage.py loaddata default_projects #> /dev/null
+    python manage.py migrate #> /dev/null
+    python manage.py loaddata default_tags #> /dev/null
+    python manage.py loaddata default_states #> /dev/null
+    python manage.py loaddata default_projects #> /dev/null
 }
 
 # the script begins!
@@ -126,7 +126,7 @@ elif [ "$1" == "--shell" ]; then
     exec bash
 elif [ "$1" == "--test" ] || [ "$1" == "--quick-test" ]; then
     shift
-    python3 manage.py test $@
+    python manage.py test $@
 elif [ "$1" == "--tox" ] || [ "$1" == "--quick-tox" ]; then
     shift
     tox $@
diff --git a/tools/docker/xenial-ports.list b/tools/docker/xenial-ports.list
deleted file mode 100644
index d84641fa..00000000
--- a/tools/docker/xenial-ports.list
+++ /dev/null
@@ -1,3 +0,0 @@
-deb http://ports.ubuntu.com/ubuntu-ports/ xenial main
-deb http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main
-deb http://ports.ubuntu.com/ubuntu-ports/ xenial-security main
diff --git a/tools/docker/xenial.list b/tools/docker/xenial.list
deleted file mode 100644
index a70ff56a..00000000
--- a/tools/docker/xenial.list
+++ /dev/null
@@ -1,3 +0,0 @@
-deb http://archive.ubuntu.com/ubuntu/ xenial main
-deb http://archive.ubuntu.com/ubuntu/ xenial-updates main
-deb http://security.ubuntu.com/ubuntu xenial-security main
-- 
2.21.0