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roc-lang-tools/docs/plans/2026-06-04-roc-oci-images-plan.md
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Roc OCI Images Implementation Plan

Goal: Build and publish three OCI container images (base, dev, ci) providing the Roc compiler, LSP, and development environment, stored in a single Containerfile with multi-stage targets.

Architecture: Single Containerfile with three build targets (base, dev, ci). A shell script downloads the official Roc release tarball from GitHub. A Makefile provides local build/push commands. A Gitea Actions workflow builds and publishes on version tags.

Tech Stack: Docker/podman multi-stage builds, bash, Gitea Actions, GitHub Releases API

Task 1: download-roc.sh script

Files:

  • Create: scripts/download-roc.sh

  • Step 1: Write the download script

This script accepts ROC_VERSION and TARGETARCH and downloads/extracts the corresponding Roc release tarball into /opt/roc/.

#!/usr/bin/env bash
set -euo pipefail

ROC_VERSION="${1:?Usage: $0 <roc-version> [target-arch]}"
TARGETARCH="${2:-amd64}"

# Map Docker buildx arch names to Roc tarball arch names
case "$TARGETARCH" in
  amd64)  ROC_ARCH="x86_64"  ;;
  arm64)  ROC_ARCH="aarch64" ;;
  *)      echo "Unsupported architecture: $TARGETARCH" >&2; exit 1 ;;
esac

TARBALL="roc-linux_${ROC_ARCH}-${ROC_VERSION}.tar.gz"
URL="https://github.com/roc-lang/roc/releases/download/${ROC_VERSION}/${TARBALL}"

echo "Downloading Roc ${ROC_VERSION} for ${ROC_ARCH}..."
curl -fsSL "$URL" -o /tmp/roc.tar.gz

echo "Extracting..."
tar -xzf /tmp/roc.tar.gz -C /tmp/

# The tarball contains a single directory with an unpredictable nightly name
# e.g. roc_nightly-linux_x86_64-2025-09-09-d73ea109/
EXTRACTED_DIR=$(find /tmp -maxdepth 1 -type d -name "roc_*" | head -1)
if [ -z "$EXTRACTED_DIR" ]; then
  echo "ERROR: Could not find extracted Roc directory in /tmp" >&2
  exit 1
fi

echo "Installing to /opt/roc..."
mkdir -p /opt/roc/bin /opt/roc/lib

install -m 0755 "$EXTRACTED_DIR/roc" /opt/roc/bin/roc

# LSP may or may not be present in older releases; install if found
if [ -f "$EXTRACTED_DIR/roc_language_server" ]; then
  install -m 0755 "$EXTRACTED_DIR/roc_language_server" /opt/roc/bin/roc_language_server
fi

# WASI libc is needed for some platforms
if [ -d "$EXTRACTED_DIR/lib" ]; then
  cp -r "$EXTRACTED_DIR/lib/"* /opt/roc/lib/
fi

# License
if [ -f "$EXTRACTED_DIR/LICENSE" ]; then
  cp "$EXTRACTED_DIR/LICENSE" /opt/roc/LICENSE
fi

# Cleanup
rm -rf /tmp/roc.tar.gz "$EXTRACTED_DIR"

echo "Roc ${ROC_VERSION} installed successfully."
/opt/roc/bin/roc --version
  • Step 2: Make it executable and commit
chmod +x scripts/download-roc.sh
git add scripts/download-roc.sh
git commit -m "feat: add Roc release download/extract script"

Task 2: Containerfile — base target

Files:

  • Create: Containerfile

  • Step 1: Write the base stage

# Roc compiler base image
# Provides just the Roc compiler binary and WASI runtime library.

ARG ROC_VERSION=0.0.0-alpha2

FROM debian:bookworm-slim AS curl-stage
RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl && rm -rf /var/lib/apt/lists/*
ARG ROC_VERSION
ARG TARGETARCH
COPY scripts/download-roc.sh /tmp/download-roc.sh
RUN /tmp/download-roc.sh "$ROC_VERSION" "$TARGETARCH"

FROM debian:bookworm-slim AS base
ARG ROC_VERSION
ARG TARGETARCH
LABEL org.opencontainers.image.title="roc-tools-base"
LABEL org.opencontainers.image.description="Roc compiler base image"
LABEL org.opencontainers.image.version="${ROC_VERSION}"
LABEL org.opencontainers.image.source="https://git.roo.lol/jbrechtel/roc-lang-tools"

RUN groupadd --gid 1000 roc && useradd --uid 1000 --gid roc --shell /bin/sh --create-home roc

COPY --from=curl-stage /opt/roc /opt/roc
ENV PATH="/opt/roc/bin:${PATH}"

USER roc
WORKDIR /home/roc
ENTRYPOINT ["roc"]
CMD ["--help"]
  • Step 2: Commit
git add Containerfile
git commit -m "feat: add Containerfile with base build target"

Task 3: Containerfile — dev target

  • Step 1: Add dev stage to Containerfile

Append to Containerfile:

FROM base AS dev
LABEL org.opencontainers.image.title="roc-tools-dev"
LABEL org.opencontainers.image.description="Roc development environment with LSP and dev tools"
LABEL org.opencontainers.image.version="${ROC_VERSION}"

USER root
RUN apt-get update && apt-get install -y --no-install-recommends \
    git \
    curl \
    bash \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

USER roc
ENTRYPOINT ["bash"]
  • Step 2: Commit
git add Containerfile
git commit -m "feat: add dev build target to Containerfile"

Task 4: Containerfile — ci target

  • Step 1: Add ci stage to Containerfile

Append to Containerfile:

FROM base AS ci
LABEL org.opencontainers.image.title="roc-tools-ci"
LABEL org.opencontainers.image.description="Roc CI/CD runner image"
LABEL org.opencontainers.image.version="${ROC_VERSION}"

USER root
RUN apt-get update && apt-get install -y --no-install-recommends \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

USER roc
ENTRYPOINT ["roc"]
CMD ["--help"]
  • Step 2: Commit
git add Containerfile
git commit -m "feat: add ci build target to Containerfile"

Task 5: Makefile

Files:

  • Create: Makefile

  • Step 1: Write the Makefile

ROC_VERSION ?= 0.0.0-alpha2
REGISTRY ?= git.roo.lol/jbrechtel

.PHONY: build-base build-dev build-ci build-all push-all

build-base:
	docker build \
		--target base \
		--build-arg ROC_VERSION=$(ROC_VERSION) \
		-t $(REGISTRY)/roc-tools-base:$(ROC_VERSION) \
		-t $(REGISTRY)/roc-tools-base:latest \
		.

build-dev:
	docker build \
		--target dev \
		--build-arg ROC_VERSION=$(ROC_VERSION) \
		-t $(REGISTRY)/roc-tools-dev:$(ROC_VERSION) \
		-t $(REGISTRY)/roc-tools-dev:latest \
		.

build-ci:
	docker build \
		--target ci \
		--build-arg ROC_VERSION=$(ROC_VERSION) \
		-t $(REGISTRY)/roc-tools-ci:$(ROC_VERSION) \
		-t $(REGISTRY)/roc-tools-ci:latest \
		.

build-all: build-base build-dev build-ci

push-base:
	docker push $(REGISTRY)/roc-tools-base:$(ROC_VERSION)
	docker push $(REGISTRY)/roc-tools-base:latest

push-dev:
	docker push $(REGISTRY)/roc-tools-dev:$(ROC_VERSION)
	docker push $(REGISTRY)/roc-tools-dev:latest

push-ci:
	docker push $(REGISTRY)/roc-tools-ci:$(ROC_VERSION)
	docker push $(REGISTRY)/roc-tools-ci:latest

push-all: build-all push-base push-dev push-ci
  • Step 2: Commit
git add Makefile
git commit -m "feat: add Makefile with build and push targets"

Task 6: Gitea Actions workflow

Files:

  • Create: .gitea/workflows/build.yaml

  • Step 1: Write the workflow

name: Build and Publish OCI Images

on:
  push:
    tags:
      - 'v*'

env:
  REGISTRY: git.roo.lol
  REGISTRY_USER: ${{ github.actor }}
  REGISTRY_PASSWORD: ${{ secrets.CONTAINER_REGISTRY_TOKEN }}
  IMAGE_NAMESPACE: ${{ github.repository_owner }}

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Extract Roc version from tag
        id: version
        run: |
          # Strip leading 'v' from tag name: v0.0.0-alpha2 -> 0.0.0-alpha2
          ROC_VERSION="${GITHUB_REF_NAME#v}"
          echo "roc_version=${ROC_VERSION}" >> "$GITHUB_OUTPUT"
          echo "ROC_VERSION=${ROC_VERSION}" >> "$GITHUB_ENV"

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to registry
        run: |
          echo "$REGISTRY_PASSWORD" | docker login $REGISTRY -u $REGISTRY_USER --password-stdin

      - name: Build and push base image
        uses: docker/build-push-action@v6
        with:
          context: .
          target: base
          build-args: ROC_VERSION=${{ steps.version.outputs.roc_version }}
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/roc-tools-base:${{ steps.version.outputs.roc_version }}
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/roc-tools-base:latest
          push: true
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Build and push dev image
        uses: docker/build-push-action@v6
        with:
          context: .
          target: dev
          build-args: ROC_VERSION=${{ steps.version.outputs.roc_version }}
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/roc-tools-dev:${{ steps.version.outputs.roc_version }}
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/roc-tools-dev:latest
          push: true
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Build and push ci image
        uses: docker/build-push-action@v6
        with:
          context: .
          target: ci
          build-args: ROC_VERSION=${{ steps.version.outputs.roc_version }}
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/roc-tools-ci:${{ steps.version.outputs.roc_version }}
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/roc-tools-ci:latest
          push: true
          cache-from: type=gha
          cache-to: type=gha,mode=max
  • Step 2: Commit
mkdir -p .gitea/workflows
git add .gitea/workflows/build.yaml
git commit -m "feat: add Gitea Actions workflow for building and publishing OCI images"

Task 7: Add .gitignore

Files:

  • Create: .gitignore

  • Step 1: Write .gitignore

*.tar.gz
/tmp/
  • Step 2: Commit
git add .gitignore
git commit -m "chore: add .gitignore"
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