Source
FROM scratch AS base
ENV VERSION=6.8
ENV SRC_HASH=c969dea4e8bb6be991bbf7c010ba0e0a5643a3a8d8fb0a2aaa053406f1e965f3
ENV SRC_FILE=linux-${VERSION}.tar.xz
ENV SRC_SITE=http://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/${SRC_FILE}
FROM base AS fetch
ADD --checksum=sha256:${SRC_HASH} ${SRC_SITE} .
FROM fetch AS build
COPY --from=stagex/busybox . /
COPY --from=stagex/gcc . /
COPY --from=stagex/binutils . /
COPY --from=stagex/musl . /
RUN tar -xf ${SRC_FILE}
WORKDIR /linux-${VERSION}
RUN --network=none gcc usr/gen_init_cpio.c -o usr/gen_init_cpio
FROM build AS install
RUN --network=none <<-EOF
set -eux
mkdir -p /rootfs/usr/bin
cat usr/gen_initramfs.sh \
| sed 's:usr/gen_init_cpio:gen_init_cpio:g' \
> /rootfs/usr/bin/gen_initramfs
chmod +x /rootfs/usr/bin/gen_initramfs
cp -a usr/gen_init_cpio /rootfs/usr/bin
EOF
FROM stagex/filesystem AS package
COPY --from=install /rootfs/. /