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# I had conflicting requirements:
# * make Makefile available during the build to avoid code duplication,
# * make out-of-tree builds possible (i.e. this directory, along with Makefile,
# shouldn't be required to reside inside the project directory).
#
# So, I basically had two build contexts (PROJECT_DIR and this directory),
# which is unsupported.
# On the other hand, I only need the Makefile from this directory, so I could
# hack it by passing the contents of the Makefile as a build argument.
# I thought this was too much though, so I came up with making two images, one
# containing the Makefile (and Ruby, etc.), and the other extending the base
# one.
# This has some nice properties (there's now a common base image for all Jekyll
# projects), but some drawbacks as well.
version: '3'
services:
base:
build:
context: .
dockerfile: Dockerfile.base
args:
- JEKYLL_UID
- JEKYLL_GID
user: "$JEKYLL_UID:$JEKYLL_GID"
project:
build:
context: "${PROJECT_DIR:-..}"
# Dockerfile outside of the build context.
# This is supposedly supported by Docker since 18.03, but I couldn't find
# a less hacky way to do it in docker-compose.
# Source: https://github.com/docker/compose/issues/4926.
dockerfile: "$PWD/Dockerfile.project"
depends_on:
# It actually doesn't depend on anything, but the base image needs to be
# built before this image.
- base
ports:
- 4000:4000
user: "$JEKYLL_UID:$JEKYLL_GID"
volumes:
- "${PROJECT_DIR:-..}:/project"
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