FROM scratch as base
ENV VERSION=6.7
ENV SRC_HASH=ef31144a2576d080d8c31698e83ec9f66bf97c677fa2aaf0d5bbb9f3345b1069
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/musl . /
COPY --from=stagex/make . /
COPY --from=stagex/binutils . /
COPY --from=stagex/linux-headers . /
COPY --from=stagex/elfutils . /
COPY --from=stagex/openssl . /
COPY --from=stagex/perl . /
COPY --from=stagex/m4 . /
COPY --from=stagex/gcc . /
COPY --from=stagex/bison . /
COPY --from=stagex/libzstd . /
COPY --from=stagex/zlib . /
COPY --from=stagex/flex . /
COPY --from=stagex/pkgconf . /
COPY --from=stagex/coreutils . /
COPY --from=stagex/findutils . /
COPY --from=stagex/diffutils . /
COPY --from=stagex/tar . /
COPY --from=stagex/gzip . /
COPY --from=stagex/xz . /
COPY --from=stagex/sed . /
COPY --from=stagex/grep . /
COPY --from=stagex/gawk . /
COPY --from=stagex/bc . /
COPY --from=stagex/bash . /
COPY --from=stagex/bash /bin/bash /bin/sh
RUN tar -xf ${SRC_FILE}
WORKDIR linux-${VERSION}
ADD linux.config .config
ENV KBUILD_BUILD_HOST=stagex
ENV KBUILD_BUILD_USER=user
ENV KBUILD_BUILD_TIMESTAMP=1
RUN <<-EOF
	set -eux
	make -j "$(nproc)" bzImage
EOF

FROM build as install
RUN <<-EOF
	set -eux
    mkdir /rootfs
	cp .config /rootfs/linux.config
	cp arch/x86_64/boot/bzImage /rootfs
EOF
RUN find /rootfs -exec touch -hcd "@0" "{}" +

FROM stagex/filesystem as package
COPY --from=install /rootfs/. /