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Alex Zenla
2025-10-01 16:45:04 -07:00
commit 17ca11f239
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37
kernel/Dockerfile Normal file
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ARG KERNEL_SOURCE_URL=https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.16.9.tar.xz
ARG KERNEL_CHECKSUM=sha256:7ac8c8a3cf05476375deaaa85dfcee095a826ffe557b437f43774fc3b64ce58d
FROM --platform=$BUILDPLATFORM debian:trixie@sha256:fd8f5a1df07b5195613e4b9a0b6a947d3772a151b81975db27d47f093f60c6e6 AS buildenv
RUN export DEBIAN_FRONTEND=noninteractive && apt-get update && apt-get install -y \
build-essential squashfs-tools python3-yaml \
patch diffutils sed mawk findutils zstd \
python3 python3-packaging curl rsync cpio \
flex bison pahole libssl-dev libelf-dev bc kmod && \
rm -rf /var/lib/apt/lists/*
ARG BUILDPLATFORM
RUN if [ "${BUILDPLATFORM}" = "linux/amd64" ] || [ "${BUILDPLATFORM}" = "linux/x86_64" ]; then \
apt-get update && apt-get install -y linux-headers-amd64 gcc-aarch64-linux-gnu && rm -rf /var/lib/apt/lists/*; fi
RUN if [ "${BUILDPLATFORM}" = "linux/arm64" ] || [ "${BUILDPLATFORM}" = "linux/aarch64" ]; then \
apt-get update && apt-get install -y linux-headers-arm64 gcc-x86-64-linux-gnu && rm -rf /var/lib/apt/lists/*; fi
RUN useradd -ms /bin/sh build
COPY --chown=build:build docker-build.sh /build/docker-build.sh
USER build
WORKDIR /build
FROM scratch AS source
ARG KERNEL_SOURCE_URL
ARG KERNEL_CHECKSUM
ADD --checksum=${KERNEL_CHECKSUM} ${KERNEL_SOURCE_URL} /src.tar.xz
FROM --platform=$BUILDPLATFORM buildenv AS build
COPY --from=source --chown=build:build /src.tar.xz /build/src.tar.xz
RUN mkdir /build/src && tar -C /build/src --strip-components=1 -xf /build/src.tar.xz && rm /build/src.tar.xz
ARG BUILDPLATFORM
ARG TARGETPLATFORM
ENV BUILDPLATFORM=${BUILDPLATFORM}
ENV TARGETPLATFORM=${TARGETPLATFORM}
WORKDIR /build/src
RUN /build/docker-build.sh
FROM scratch AS final
COPY --from=build /build/src/kernel.image /kernel.efi

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kernel/docker-build.sh Executable file
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#!/bin/sh
set -e
TARGET_KARCH=""
TARGET_SARCH=""
MAYBE_CROSS_COMPILE=""
CURRENT_SARCH="$(uname -m)"
[ "${CURRENT_SARCH}" = "amd64" ] && CURRENT_SARCH="x86_64"
[ "${CURRENT_SARCH}" = "arm64" ] && CURRENT_SARCH="aarch64"
if [ "${TARGETPLATFORM}" = "linux/aarch64" ] || [ "${TARGETPLATFORM}" = "linux/arm64" ]; then
TARGET_KARCH="arm64"
TARGET_SARCH="aarch64"
if [ "${CURRENT_SARCH}" != "${TARGET_SARCH}" ]; then
MAYBE_CROSS_COMPILE="aarch64-linux-gnu-"
fi
elif [ "${TARGETPLATFORM}" = "linux/x86_64" ] || [ "${TARGETPLATFORM}" = "linux/amd64" ]; then
TARGET_KARCH="x86_64"
TARGET_SARCH="x86_64"
if [ "${CURRENT_SARCH}" != "${TARGET_SARCH}" ]; then
MAYBE_CROSS_COMPILE="x86_64-linux-gnu-"
fi
else
echo "Unknown platform: ${TARGETPLATFORM}" >/dev/stderr
exit 1
fi
make CROSS_COMPILE="${MAYBE_CROSS_COMPILE}" ARCH="${TARGET_KARCH}" defconfig
make CROSS_COMPILE="${MAYBE_CROSS_COMPILE}" ARCH="${TARGET_KARCH}" mod2yesconfig
./scripts/config -e DRM_VIRTIO_GPU
./scripts/config -e FRAMEBUFFER_CONSOLE
./scripts/config -e FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
make "-j$(nproc)" CROSS_COMPILE="${MAYBE_CROSS_COMPILE}" ARCH="${TARGET_KARCH}"
[ -f "arch/x86/boot/bzImage" ] && cp "arch/x86/boot/bzImage" kernel.image
[ -f "arch/arm64/boot/Image.gz" ] && gzip -d < "arch/arm64/boot/Image.gz" > kernel.image
exit 0