# A Dockerfile for MediaGoblin hacking.
#
# Most development Docker images are built and run as root. That doesn't work
# here because the `bower` command run within the `make` step, refuses to run as
# root.
#
# To build this Docker image, run:
#
#   docker build -t mediagoblin-python3 -f Dockerfile-debian-python3-sqlite .  # or
#   docker build -t mediagoblin-python3 - < Dockerfile-debian-python3-sqlite  # with no build context
#
# The "- < Dockerfile" format advises Docker not to include the current
# directory as build context.
#
# Before running the image you first need to first assign the "mediagoblin" and
# "user_dev" directories to an artificial group (1024) on the host that is
# mirrored within the image (details below):
#
#   sudo chown --recursive :1024 mediagoblin user_dev
#   find mediagoblin user_dev -type d -exec chmod 775 {} \;
#   find mediagoblin user_dev -type f -exec chmod 664 {} \;
#
# Then you can run the image with the upstream MediaGoblin code:
#
#   docker run --interactive --tty --publish 6543:6543 mediagoblin-python3
#
# Or you can run with your local "mediagoblin" and "user_dev" directories
# bind-mounted into the container. This provides automatic code reloading and
# persistence:
#
#   # TODO: Not working.
#   docker run --interactive --tty --publish 6543:6543 --volume ./mediagoblin:/opt/mediagoblin/mediagoblin --volume ./extlib:/opt/mediagoblin/extlib mediagoblin-python3
#
# Alternatively you use docker-compose instead of separate build/run steps:
#
#   sudo chown --recursive :1024 mediagoblin user_dev
#   find mediagoblin user_dev -type d -exec chmod 775 {} \;
#   find mediagoblin user_dev -type f -exec chmod 664 {} \;
#   docker-compose up --build
#
# You can run the test suite with:
#
# docker run --tty mediagoblin-python3 bash -c "bin/python -m pytest ./mediagoblin/tests --boxed"


FROM debian:buster

# Install bootstrap and configure dependencies. Currently requires virtualenv
# rather than the more modern python3-venv (should be fixed).
RUN apt-get update && apt-get install -y \
automake \
git \
nodejs \
npm \
python3-dev \
virtualenv

# Install make and runtime dependencies.
#
# Excluding python3-celery here due to conflict with dist-packges for a
# compatible version of billiard.
RUN apt-get install -y \
python3-alembic \
python3-jsonschema \
python3-kombu \
python3-lxml \
python3-migrate \
python3-py \
python3-pytest \
python3-pytest-xdist \
python3-six \
python3-snowballstemmer \
python3-sphinx \
python3-sphinxcontrib.websupport \
python3-webtest

# Install audio dependencies.
RUN apt-get install -y \
gstreamer1.0-libav \
gstreamer1.0-plugins-bad \
gstreamer1.0-plugins-base \
gstreamer1.0-plugins-good \
gstreamer1.0-plugins-ugly \
python3-gst-1.0

# Install video dependencies.
RUN apt-get install -y \
gir1.2-gst-plugins-base-1.0 \
gir1.2-gstreamer-1.0 \
gstreamer1.0-tools \
python3-gi

# Install document (PDF-only) dependencies.
# TODO: Check that PDF tests aren't skipped.
RUN apt-get install -y \
poppler-utils

# Create working directory.
RUN mkdir /opt/mediagoblin
RUN chown -R www-data:www-data /opt/mediagoblin
WORKDIR /opt/mediagoblin

# Create /var/www because Bower writes some cache files into /var/www during
# make, failing if it doesn't exist.
RUN mkdir --mode=g+w /var/www
RUN chown root:www-data /var/www

# Set up custom group to align with volume permissions for mounted
# "mediagoblin/mediagoblin" and "mediagoblin/user_dev".
#
# The problem here is that the host's UID, GID and mode are used in the
# container, but of course the container's user www-data is running under a
# different UID/GID so can't read or write to the volume. It seems like there
# should be a better approach, but we'll align volume permissions between host
# and container as per
# https://medium.com/@nielssj/docker-volumes-and-file-system-permissions-772c1aee23ca
RUN groupadd --system mediagoblin --gid 1024 && adduser www-data mediagoblin

USER www-data

# Copy upstream MediaGoblin into the image for use in the build process.
#
# This build process is somewhat complicated, because of Bower/NPM, translations
# and Python dependencies, so it's not really feasible just to copy over a
# requirements.txt like many Python Dockerfiles examples do. We need the full
# source.
#
# While it is possible to copy the source from the current directory like this:
#
# COPY --chown=www-data:www-data . /opt/mediagoblin
#
# that approach to lots of confusing problems when your working directory has
# changed from the default - say you've enabled some plugins or switched
# database type. So instead we're doing a git clone. We could potentially use
# `git archive` but this still wouldn't account for the submodules.
#
# TODO: Figure out a docker-only way to do the build and run from our local
# version, so that local changes are immediately available to the running
# container. Not as easy as it sounds. We have this working with docker-compose,
# but still uses upstream MediaGoblin for the build.
# RUN git clone --depth=1 git://git.savannah.gnu.org/mediagoblin.git --branch master .
RUN git clone --depth=1 https://gitlab.com/BenSturmfels/mediagoblin.git --branch spectrograms .

RUN ./bootstrap.sh
RUN VIRTUALENV_FLAGS='--system-site-packages' ./configure
RUN make

# Run the tests.
RUN ./bin/python -m pytest ./mediagoblin/tests --boxed

# Only safe if being run on a clean git checkout. Otherwise you may have already
# customised mediagoblin.ini to already install these.
RUN echo '[[mediagoblin.media_types.audio]]' >> mediagoblin.ini
RUN echo '[[mediagoblin.media_types.video]]' >> mediagoblin.ini

# Prepare the SQLite database.
#
# TODO: Should probably be done at runtime.
RUN ./bin/gmg dbupdate
RUN ./bin/gmg adduser --username admin --password a --email admin@example.com
RUN ./bin/gmg makeadmin admin

EXPOSE 6543/tcp

# TODO: Is it possible to have a CMD here that is overriden by docker-compose?
CMD ["./lazyserver.sh", "--server-name=broadcast"]