Dockerfile

ARG image="quay.io/centos/centos:stream9"
FROM ${image} as base
ARG channel="stable"
ARG location

RUN [ -z "${channel}" ] && echo "ARG channel is required" && exit 1 || true

RUN yum -y install jq xz
RUN ARCH=$(uname -m) ; echo $ARCH \
        ; curl https://builds.coreos.fedoraproject.org/streams/${channel}.json -o stable.json && \
                cat stable.json | jq -r --arg arch "$ARCH" '.architectures[$arch].artifacts.qemu.release'


FROM base AS executor-img

RUN ARCH=$(uname -m) ; \
        echo "Downloading" $(cat stable.json | jq -r --arg arch "$ARCH" '.architectures[$arch].artifacts.qemu.formats."qcow2.xz".disk.location') && \
        curl -s -o coreos_production_qemu_image.qcow2.xz $(cat stable.json | jq -r --arg arch "$ARCH" '.architectures[$arch].artifacts.qemu.formats."qcow2.xz".disk.location') && \
        unxz coreos_production_qemu_image.qcow2.xz

FROM base AS final
ARG channel=stable

RUN mkdir -p /userdata
WORKDIR /userdata

RUN yum -y update && \
        yum -y remove jq && \
        yum -y install openssh-clients qemu-kvm && \
        yum -y clean all

COPY --from=executor-img /coreos_production_qemu_image.qcow2 /userdata/coreos_production_qemu_image.qcow2
COPY start.sh /userdata/start.sh

RUN chgrp -R 0 /userdata && \
    chmod -R g=u /userdata

LABEL com.coreos.channel ${channel}

ENTRYPOINT ["/bin/bash", "/userdata/start.sh"]