Dockerfile

ARG base_image
ARG builder_image=concourse/golang-builder

# stage: builder
FROM ${builder_image} AS builder

WORKDIR /concourse/docker-image-resource
COPY go.mod .
COPY go.sum .
RUN go mod download
COPY . .

ENV CGO_ENABLED 0
COPY assets/ /assets
RUN go build -o /assets/check github.com/concourse/docker-image-resource/cmd/check
RUN go build -o /assets/print-metadata github.com/concourse/docker-image-resource/cmd/print-metadata
RUN go build -o /assets/ecr-login github.com/awslabs/amazon-ecr-credential-helper/ecr-login/cli/docker-credential-ecr-login
RUN set -e; \
    for pkg in $(go list ./...); do \
      go test -o "/tests/$(basename $pkg).test" -c $pkg; \
    done

# stage: resource
FROM ${base_image} AS resource
USER root

RUN apt update && apt upgrade -y -o Dpkg::Options::="--force-confdef"
# docker hosts their own packages, this steps sets up the repo for apt-get
RUN apt update; \
  apt install -y --no-install-recommends \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common; \
  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | \
  gpg --dearmor -o /etc/apt/keyrings/docker.gpg | \
  chmod a+r /etc/apt/keyrings/docker.gpg | \
  echo \
  "deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  tee /etc/apt/sources.list.d/docker.list > /dev/null

RUN apt update && apt install -y --no-install-recommends \
    docker-ce \
    docker-buildx-plugin \
    jq \
    ca-certificates \
    xz-utils \
    iproute2 \
  && rm -rf /var/lib/apt/lists/*
RUN apt remove -y python3

COPY --from=builder /assets /opt/resource
RUN ln -s /opt/resource/ecr-login /usr/local/bin/docker-credential-ecr-login

# stage: tests
FROM resource AS tests
COPY --from=builder /tests /tests
ADD . /docker-image-resource
RUN set -e; \
    for test in /tests/*.test; do \
      $test -ginkgo.v; \
    done

# final output stage
FROM resource