docker/initramfs.Dockerfile
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ARG TAG=dev
ARG DOCKER_IMAGE_ROOT=monok8s
FROM --platform=$BUILDPLATFORM ${DOCKER_IMAGE_ROOT}/build-base:${TAG} AS build
ARG BUSYBOX_VERSION
ARG ARCH
ARG CROSS_COMPILE
WORKDIR /build
RUN test -n "${BUSYBOX_VERSION}" || (echo "Please specify BUSYBOX_VERSION" >&2; exit 1); \
test -n "${ARCH}" || (echo "Please specify ARCH" >&2; exit 1); \
test -n "${CROSS_COMPILE}" || (echo "Please specify CROSS_COMPILE" >&2; exit 1)
COPY packages/busybox-${BUSYBOX_VERSION}.tar.gz ./
RUN tar -xf busybox-${BUSYBOX_VERSION}.tar.gz && mv "busybox-${BUSYBOX_VERSION}" busybox
WORKDIR /build/busybox
RUN make ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} defconfig \
&& sed -i \
-e 's/^# CONFIG_STATIC is not set/CONFIG_STATIC=y/' \
-e 's/^CONFIG_TC=.*/# CONFIG_TC is not set/' .config
RUN make CROSS_COMPILE=${CROSS_COMPILE} -j"$(nproc)"
RUN make CROSS_COMPILE=${CROSS_COMPILE} CONFIG_PREFIX=/out/initramfs install
WORKDIR /build
ARG BUILD_TAG
COPY alpine/*.sh ./
COPY initramfs/*.sh ./
COPY out/rootfs /out/rootfs
COPY initramfs/rootfs-extra ./rootfs-extra
COPY out/build-info ./rootfs-extra/etc/build-info
WORKDIR /out/initramfs
RUN /build/build-rootfs.sh
FROM scratch
COPY --from=build /out/initramfs.cpio.gz /initramfs.cpio.gz