"make release" draft

docker/initramfs.Dockerfile

@@ -0,0 +1,43 @@
+ARG TAG=dev
+ARG DOCKER_IMAGE_ROOT=monok8s
+FROM --platform=$BUILDPLATFORM ${DOCKER_IMAGE_ROOT}/kernel-build:${TAG} AS kernel
+
+# Selective mods
+RUN mkdir /out/selected-mods
+COPY initramfs/selective-mods.sh /
+RUN /selective-mods.sh /out/rootfs/lib/modules/$(ls /out/rootfs/lib/modules/) /out/selected-mods
+
+FROM --platform=$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
+
+COPY --from=kernel /out/selected-mods/* ./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