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‎.github/workflows/ci.yml

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name: CI
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on:
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push:
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branches:
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- main
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pull_request:
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jobs:
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build:
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runs-on: ubuntu-latest
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if: ${{ github.repository == 'codewars/haskell' }}
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steps:
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- uses: actions/checkout@v2
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- uses: docker/setup-buildx-action@v2
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- name: Build image
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uses: docker/build-push-action@v3
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with:
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context: .
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push: false
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# Make the image available in next step
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load: true
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tags: ghcr.io/codewars/haskell:latest
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cache-from: type=gha
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cache-to: type=gha,mode=max
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- name: Run Passing Example
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run: bin/run passing
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- name: Report Image Size
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run: |
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echo "## Image Size" >> $GITHUB_STEP_SUMMARY
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docker image inspect --format '{{.Size}}' ghcr.io/codewars/haskell:latest | numfmt --to=si --suffix=B >> $GITHUB_STEP_SUMMARY

‎.github/workflows/push-image.yml

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# Build and push a Docker image to GitHub Container Registry when
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# a new tag is pushed.
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name: Push Image
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on:
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push:
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tags:
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- "*"
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jobs:
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build-and-push-image:
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if: ${{ github.repository == 'codewars/haskell' }}
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runs-on: ubuntu-latest
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permissions:
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contents: read
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packages: write
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steps:
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- uses: actions/checkout@v2
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- name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v2
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- name: Login to GitHub Container Registry
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uses: docker/login-action@v2
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with:
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registry: ghcr.io
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username: codewars
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Build and push image
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uses: docker/build-push-action@v3
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with:
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context: .
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push: true
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tags: |
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ghcr.io/codewars/haskell:latest
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ghcr.io/codewars/haskell:${{ github.ref_name }}
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cache-from: type=gha
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cache-to: type=gha,mode=max

‎Dockerfile

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FROM debian:10
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# Based on https://github.com/haskell/docker-haskell/blob/fb5c774c38a7ab2e7d233d95368be0f899353496/8.8/buster/Dockerfile
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# LTS Haskell 16.25 (2020-12-06) GHC 8.8.4
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# See https://www.stackage.org/lts-16.25 for package versions
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ENV LANG=C.UTF-8
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RUN set -ex; \
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apt-get update; \
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apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr; \
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rm -rf /var/lib/apt/lists/*;
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ENV GHC=8.8.4 CABAL_INSTALL=3.2 DEBIAN_KEY=427CB69AAC9D00F2A43CAF1CBA3CBA3FFE22B574 LTS_HASKELL=16.25
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RUN set -ex; \
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export GNUPGHOME="$(mktemp -d)"; \
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gpg --batch --keyserver keyserver.ubuntu.com --recv-keys ${DEBIAN_KEY}; \
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gpg --batch --armor --export ${DEBIAN_KEY} > /etc/apt/trusted.gpg.d/haskell.org.gpg.asc; \
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gpgconf --kill all; \
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echo 'deb http://downloads.haskell.org/debian buster main' > /etc/apt/sources.list.d/ghc.list; \
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apt-get update; \
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apt-get install -y --no-install-recommends \
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cabal-install-${CABAL_INSTALL} \
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curl \
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g++ \
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ghc-${GHC} \
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git \
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libsqlite3-dev \
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libtinfo-dev \
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make \
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netbase \
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openssh-client \
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xz-utils \
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zlib1g-dev \
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# regex-pcre requires pcre
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libpcre3 \
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libpcre3-dev \
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; \
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rm -rf "$GNUPGHOME" /var/lib/apt/lists/* /tmp/* /var/tmp/*;
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ENV STACK=2.5.1 STACK_RELEASE_KEY=C5705533DA4F78D8664B5DC0575159689BEFB442
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RUN set -ex; \
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export GNUPGHOME="$(mktemp -d)"; \
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gpg --batch --keyserver keyserver.ubuntu.com --recv-keys ${STACK_RELEASE_KEY}; \
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curl -fSL https://github.com/commercialhaskell/stack/releases/download/v${STACK}/stack-${STACK}-linux-x86_64.tar.gz -o stack.tar.gz; \
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curl -fSL https://github.com/commercialhaskell/stack/releases/download/v${STACK}/stack-${STACK}-linux-x86_64.tar.gz.asc -o stack.tar.gz.asc; \
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gpg --batch --verify stack.tar.gz.asc stack.tar.gz; \
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gpgconf --kill all; \
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tar -xf stack.tar.gz -C /usr/local/bin --strip-components=1; \
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stack config set system-ghc --global true; \
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stack config set install-ghc --global false; \
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rm -rf "$GNUPGHOME" /var/lib/apt/lists/* /stack.tar.gz.asc /stack.tar.gz;
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ENV PATH=/opt/cabal/${CABAL_INSTALL}/bin:/opt/ghc/${GHC}/bin:$PATH
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RUN set -ex; \
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useradd --create-home codewarrior; \
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mkdir -p /workspace; \
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chown codewarrior: /workspace;
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USER codewarrior
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ENV USER=codewarrior HOME=/home/codewarrior
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ENV PATH=/home/codewarrior/.cabal/bin:/home/codewarrior/.local/bin:$PATH
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COPY --chown=codewarrior:codewarrior workspace/ /workspace/
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WORKDIR /workspace
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RUN stack build
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# Sanity check
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RUN set -ex; \
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stack ghc -- -O -isrc:test --make -o tests -outputdir /tmp test/Main.hs && ./tests; \
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rm src/Example.hs test/ExampleSpec.hs tests /tmp/*;

‎README.md

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# haskell
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Container image for Haskell
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## Usage
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```bash
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W=/workspace
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# Create container
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COMPILE="stack ghc -- -O -j2 +RTS -A128m -n2m -RTS --make -v0 -outputdir /tmp -isrc:test test/Main.hs -o tests"
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C=$(docker container create --rm -w $W $IMAGE sh -c "$COMPILE && exec ./tests")
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# Copy files from the examples directory
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docker container cp ./examples/passing/. $C:$W
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# Start
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docker container start --attach $C
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```
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## Building
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```bash
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docker build -t ghcr.io/codewars/haskell:latest .
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```

‎bin/run

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#!/bin/bash
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set -eu
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if [ -z "${IMAGE:+x}" ]; then
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IMAGE=ghcr.io/codewars/haskell:latest
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fi
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W=/workspace
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# Create container
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COMPILE="stack ghc -- -O -j2 +RTS -A128m -n2m -RTS --make -v0 -outputdir /tmp -isrc:test test/Main.hs -o tests"
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C=$(docker container create --rm -w $W $IMAGE sh -c "$COMPILE && exec ./tests")
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# Copy files from the examples directory
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docker container cp examples/${1:-passing}/. $C:$W
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# Run tests
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docker container start --attach $C

‎examples/passing/src/Example.hs

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module Example where
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add :: Num a => a -> a -> a
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add = (+)

‎examples/passing/test/ExampleSpec.hs

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module ExampleSpec where
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import Test.Hspec
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import Example
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spec :: Spec
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spec = do
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describe "add" $ do
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it "adds Nums" $ do
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(add 1 1) `shouldBe` (2 :: Integer)

‎workspace/Setup.hs

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import Distribution.Simple
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main = defaultMain

‎workspace/package.yaml

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name: challenge
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version: 0.1.0
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license: BSD3
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synopsis: Haskell challenge
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dependencies:
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- base >= 4.7 && < 5
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- attoparsec
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- haskell-src-exts
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- hspec
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- hspec-attoparsec
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- hspec-codewars
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- hspec-contrib
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- hspec-formatters-codewars
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- hspec-megaparsec
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- HUnit-approx
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- lens
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- megaparsec
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- mtl
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- parsec
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- persistent
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- persistent-sqlite
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- persistent-template
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- random
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- regex-pcre
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- regex-posix
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- regex-tdfa
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- split
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- text
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- transformers
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- vector
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library:
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source-dirs: src

‎workspace/src/Example.hs

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module Example where
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add :: Num a => a -> a -> a
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add = (+)

‎workspace/stack.yaml

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resolver: lts-16.25
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extra-deps:
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- url: https://github.com/codewars/hspec-formatters-codewars/archive/v0.1.0.tar.gz
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- url: https://github.com/codewars/hspec-codewars/archive/v0.1.0.tar.gz
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# Control whether we use the GHC we find on the path
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system-ghc: true

‎workspace/test/ExampleSpec.hs

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module ExampleSpec where
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import Test.Hspec
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import Example
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-- main is optional
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main :: IO ()
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main = hspec spec
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spec :: Spec
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spec = do
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describe "add" $ do
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it "adds Nums" $ do
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(add 1 1) `shouldBe` (2 :: Integer)

‎workspace/test/Main.hs

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module Main where
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import Test.Hspec.Runner
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import Test.Hspec.Formatters.Codewars (codewars)
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import qualified Spec
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main :: IO ()
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main = hspecWith defaultConfig {configFormatter = Just codewars} Spec.spec

‎workspace/test/Spec.hs

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{-# OPTIONS_GHC -F -pgmF hspec-discover -optF --module-name=Spec #-}

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