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 's/^# CONFIG_STATIC is not set/CONFIG_STATIC=y/' .config
RUN make CROSS_COMPILE=${CROSS_COMPILE} -j"$(nproc)"
RUN make CROSS_COMPILE=${CROSS_COMPILE} CONFIG_PREFIX=/out/initramfs install
WORKDIR /out/initramfs
COPY initramfs/init init
RUN chmod +x init
RUN mkdir -p bin sbin etc proc sys dev lib usr/bin usr/sbin
# Selective mods
RUN mkdir -p /out/selected-mods /out/kernel
COPY initramfs/selective-mods.sh /
COPY out/rootfs /out/rootfs
RUN /selective-mods.sh /out/rootfs/lib/modules/$(ls /out/rootfs/lib/modules/) ./lib/
RUN find . -print0 | cpio --null -ov --format=newc | gzip -9 > ../initramfs.cpio.gz
FROM scratch
COPY --from=build /out/initramfs.cpio.gz /initramfs.cpio.gz