Fast multi-stage docker builds for haskell

base.dockerfile

FROM fpco/stack-build:lts-11.7

RUN stack setup --resolver=lts-10.3
ONBUILD COPY ./stack.yaml ./package.yaml ./
ONBUILD RUN stack build --only-dependencies

Dockerfile

FROM base-haskell:lts-11.7 AS builder

# Copy all local files and build the app
COPY . .
RUN stack install

FROM debian:stretch-slim AS distro
ENV LC_ALL=C.UTF-8

# Copy the executable from the builder stage
COPY --from=builder /root/.local/bin/hadolint /bin/
CMD ["/bin/hadolint", "-"]

instructions

#!/bin/bash

docker build -f base.dockerfile -t base-haskell:lts-11.7 .

# docker-build-cacher needs some env vars to populate the cache
export APP_NAME=hadolint
export GIT_BRANCH=master
export DOCKER_TAG=hadolint:latest
export DOCKERFILE=Dockerfile

docker-build-cacher build
docker-build-cacher cache