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Author: kazk

.dockerignore

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+workspace/*/.vscode/
+workspace/*/bin/
+workspace/*/obj/
+workspace/*/*.log

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'codewars/fsharp' }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/setup-buildx-action@v2
+
+      - name: Build image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: false
+          # Make the image available in next step
+          load: true
+          tags: ghcr.io/codewars/fsharp:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Run Passing Example
+        run: bin/run passing
+
+      - name: Report Image Size
+        run: |
+          echo "## Image Size" >> $GITHUB_STEP_SUMMARY
+          docker image inspect --format '{{.Size}}' ghcr.io/codewars/fsharp: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
+# a new tag is pushed.
+name: Push Image
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  build-and-push-image:
+    if: ${{ github.repository == 'codewars/fsharp' }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: codewars
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/codewars/fsharp:latest
+            ghcr.io/codewars/fsharp:${{ github.ref_name }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.gitignore

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+workspace/bin/
+workspace/obj/
+workspace/*/*.log

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:6.0
+
+RUN set -ex; \
+    useradd --create-home -u 9999 codewarrior; \
+    mkdir -p /workspace; \
+    chown codewarrior:codewarrior /workspace;
+
+COPY --chown=codewarrior:codewarrior workspace /workspace
+
+RUN set -ex; \
+    echo "#!/bin/sh" > /usr/bin/fsc; \
+    echo "dotnet /usr/share/dotnet/sdk/$(dotnet --version)/FSharp/fsc.dll \$@" >> /usr/bin/fsc; \
+    chmod +x /usr/bin/fsc; \
+    mkdir -p /opt/nuget/packages; \
+    mkdir -p /opt/nuget/cache; \
+    chmod -R o+rw /opt/nuget;
+
+USER codewarrior
+ENV USER=codewarrior \
+    HOME=/home/codewarrior \
+    DOTNET_CLI_TELEMETRY_OPTOUT=1 \
+    NUGET_PACKAGES=/opt/nuget/packages \
+    NUGET_HTTP_CACHE_PATH=/opt/nuget/cache
+
+RUN set -ex; \
+    cd /workspace; \
+    dotnet restore; \
+# Copy all the necessary files to bin/
+    dotnet build --no-restore; \
+# Remove obj/ to get the verbose output to extract reference paths
+    rm -rf bin/Debug/net6.0/run.pdb obj; \
+# Append reference paths to `cnfig.rsp`
+    dotnet run --verbosity normal | grep '\-r:' >> config.rsp; \
+# Sanity check
+    fsc @config.rsp Preloaded.fs Solution.fs Tests.fs Program.fs; \
+    dotnet bin/Debug/net6.0/run.dll; \
+# Remove examples
+    rm Preloaded.fs Solution.fs Tests.fs bin/Debug/net6.0/run.dll;
+
+WORKDIR /workspace

LICENSE

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+MIT License
+
+Copyright (c) 2022 Qualified
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# fsharp
+
+Container image for F#
+
+## Usage
+
+See [bin/run](./bin/run).
+
+## Building
+
+```bash
+docker build -t ghcr.io/codewars/fsharp:latest .
+```

bin/run

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+#!/bin/bash
+set -eu
+
+if [ -z "${IMAGE:+x}" ]; then
+  IMAGE=ghcr.io/codewars/fsharp:latest
+fi
+
+W=/workspace
+
+# Create container
+# Note that Program.fs must come last
+C=$(docker container create --rm -w $W $IMAGE sh -c "fsc @config.rsp Preloaded.fs Solution.fs Tests.fs Program.fs && dotnet run bin/Debug/net6.0/run.dll")
+
+# Copy files from the examples directory
+docker container cp examples/${1:-passing}/. $C:$W
+
+# Run tests
+docker container start --attach $C

examples/failing/Preloaded.fs

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+module Preloaded
+    type Answer = Even | Odd
+

examples/failing/Solution.fs

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+module OddOrEvenKata
+
+open Preloaded
+
+let oddOrEven n = match n % 2 with
+                  | 1 -> Answer.Even
+                  | _ -> Answer.Odd
+