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111 lines
3.7 KiB
111 lines
3.7 KiB
#!/bin/bash
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source ./hooks/arches.sh
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export DOCKER_CLI_EXPERIMENTAL=enabled
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# Join a list of args with a single char.
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# Ref: https://stackoverflow.com/a/17841619
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join() { local IFS="$1"; shift; echo "$*"; }
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set -ex
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echo ">>> Starting local Docker registry when needed..."
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# Docker Buildx's `docker-container` driver is needed for multi-platform
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# builds, but it can't access existing images on the Docker host (like the
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# cross-compiled ones we just built). Those images first need to be pushed to
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# a registry -- Docker Hub could be used, but since it's not trivial to clean
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# up those intermediate images on Docker Hub, it's easier to just run a local
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# Docker registry, which gets cleaned up automatically once the build job ends.
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#
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# https://docs.docker.com/registry/deploying/
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# https://hub.docker.com/_/registry
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#
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# Use host networking so the buildx container can access the registry via
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# localhost.
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#
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# First check if there already is a registry container running, else skip it.
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# This will only happen either locally or running it via Github Actions
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#
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if ! timeout 5 bash -c 'cat < /dev/null > /dev/tcp/localhost/5000'; then
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# defaults to port 5000
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docker run -d --name registry --network host registry:2
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fi
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# Docker Hub sets a `DOCKER_REPO` env var with the format `index.docker.io/user/repo`.
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# Strip the registry portion to construct a local repo path for use in `Dockerfile.buildx`.
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LOCAL_REGISTRY="localhost:5000"
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REPO="${DOCKER_REPO#*/}"
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LOCAL_REPO="${LOCAL_REGISTRY}/${REPO}"
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echo ">>> Pushing images to local registry..."
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for arch in ${arches[@]}; do
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docker_image="${DOCKER_REPO}:${DOCKER_TAG}-${arch}"
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local_image="${LOCAL_REPO}:${DOCKER_TAG}-${arch}"
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docker tag "${docker_image}" "${local_image}"
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docker push "${local_image}"
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done
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echo ">>> Setting up Docker Buildx..."
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# Same as earlier, use host networking so the buildx container can access the
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# registry via localhost.
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#
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# Ref: https://github.com/docker/buildx/issues/94#issuecomment-534367714
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#
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# Check if there already is a builder running, else skip this and use the existing.
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# This will only happen either locally or running it via Github Actions
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#
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if ! docker buildx inspect builder > /dev/null 2>&1 ; then
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docker buildx create --name builder --use --driver-opt network=host
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fi
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echo ">>> Running Docker Buildx..."
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tags=("${DOCKER_REPO}:${DOCKER_TAG}")
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# If the Docker tag starts with a version number, assume the latest release
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# is being pushed. Add an extra tag (`latest` or `alpine`, as appropriate)
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# to make it easier for users to track the latest release.
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if [[ "${DOCKER_TAG}" =~ ^[0-9]+\.[0-9]+\.[0-9]+ ]]; then
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if [[ "${DOCKER_TAG}" == *alpine ]]; then
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tags+=(${DOCKER_REPO}:alpine)
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else
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tags+=(${DOCKER_REPO}:latest)
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fi
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fi
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tag_args=()
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for tag in "${tags[@]}"; do
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tag_args+=(--tag "${tag}")
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done
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# Docker Buildx takes a list of target platforms (OS/arch/variant), so map
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# the arch list to a platform list (assuming the OS is always `linux`).
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declare -A arch_to_platform=(
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[amd64]="linux/amd64"
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[armv6]="linux/arm/v6"
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[armv7]="linux/arm/v7"
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[arm64]="linux/arm64"
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)
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platforms=()
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for arch in ${arches[@]}; do
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platforms+=("${arch_to_platform[$arch]}")
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done
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platforms="$(join "," "${platforms[@]}")"
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# Run the build, pushing the resulting images and multi-arch manifest list to
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# Docker Hub. The Dockerfile is read from stdin to avoid sending any build
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# context, which isn't needed here since the actual cross-compiled images
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# have already been built.
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docker buildx build \
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--network host \
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--build-arg LOCAL_REPO="${LOCAL_REPO}" \
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--build-arg DOCKER_TAG="${DOCKER_TAG}" \
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--platform "${platforms}" \
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"${tag_args[@]}" \
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--push \
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- < ./docker/Dockerfile.buildx
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