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kernel: Simplify/restructure Dockerfile

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- Use a RUN command per artefact created
- Use WORKDIR to avoid "cd /linux" on every RUN command
- Copy all relevant build artefacts to /out
- Only create one additional layer in final stage
- Add System.map to output image

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer 2017-05-01 11:25:02 +01:00
parent 34d508562d
commit 5ab5f31e14
1 changed files with 22 additions and 19 deletions
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41
kernel/Dockerfile
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@ -20,28 +20,35 @@ RUN if [ $DEBUG -ne "0" ]; then \
# Apply local patches
COPY patches-${KERNEL_SERIES} /patches
RUN cd /linux && \
set -e && for patch in /patches/*.patch; do \
WORKDIR /linux
RUN set -e && for patch in /patches/*.patch; do \
echo "Applying $patch"; \
patch -p1 < "$patch"; \
done
RUN cd /linux && \
make defconfig && \
RUN mkdir /out
# Kernel
RUN make defconfig && \
make oldconfig && \
make -j "$(getconf _NPROCESSORS_ONLN)" KCFLAGS="-fno-pie"
RUN cd /linux && \
make INSTALL_MOD_PATH=/tmp/kernel-modules modules_install && \
make -j "$(getconf _NPROCESSORS_ONLN)" KCFLAGS="-fno-pie" && \
cp arch/x86_64/boot/bzImage /out/kernel && \
cp System.map /out
# Modules
RUN make INSTALL_MOD_PATH=/tmp/kernel-modules modules_install && \
( DVER=$(basename $(find /tmp/kernel-modules/lib/modules/ -mindepth 1 -maxdepth 1)) && \
cd /tmp/kernel-modules/lib/modules/$DVER && \
rm build source && \
ln -s /usr/src/linux-headers-$DVER build ) && \
mkdir -p /tmp/kernel-headers/usr && \
make INSTALL_HDR_PATH=/tmp/kernel-headers/usr headers_install && \
( cd /tmp/kernel-headers && tar cf /kernel-headers.tar usr ) && \
( cd /tmp/kernel-modules && tar cf /kernel-modules.tar lib ) && \
cp vmlinux arch/x86_64/boot/bzImage /
( cd /tmp/kernel-modules && tar cf /out/kernel.tar lib )
# Headers (userspace API)
RUN mkdir -p /tmp/kernel-headers/usr && \
make INSTALL_HDR_PATH=/tmp/kernel-headers/usr headers_install && \
( cd /tmp/kernel-headers && tar cf /out/kernel-headers.tar usr )
# Headers (kernel development)
RUN DVER=$(basename $(find /tmp/kernel-modules/lib/modules/ -mindepth 1 -maxdepth 1)) && \
dir=/tmp/usr/src/linux-headers-$DVER && \
mkdir -p $dir && \
@ -49,17 +56,13 @@ RUN DVER=$(basename $(find /tmp/kernel-modules/lib/modules/ -mindepth 1 -maxdept
cd /linux && \
cp -a include "$dir" && \
mkdir -p "$dir"/arch/x86 && cp -a arch/x86/include "$dir"/arch/x86/ && \
( cd /tmp && tar cf /kernel-dev.tar usr/src )
( cd /tmp && tar cf /out/kernel-dev.tar usr/src )
RUN printf "KERNEL_SOURCE=${KERNEL_SOURCE}\n" > /kernel-source-info
RUN printf "KERNEL_SOURCE=${KERNEL_SOURCE}\n" > /out/kernel-source-info
FROM linuxkit/toybox-media:eee3dd4d72cd784801e95b1781e6c4f9d8a5e5eb@sha256:7f940e687164ee2676e11c61705c79f7dd2d144ee87ad17a494848a7045f5f53
ENTRYPOINT []
CMD []
WORKDIR /
COPY --from=kernel-build bzImage /kernel
COPY --from=kernel-build kernel-headers.tar /
COPY --from=kernel-build kernel-modules.tar /kernel.tar
COPY --from=kernel-build kernel-dev.tar /
COPY --from=kernel-build kernel-source-info /
COPY --from=kernel-build /out/* /