os-kernel/scripts/build-kernel

#!/bin/bash
set -e

cd $(dirname $0)/..

source scripts/build-common

export CCACHE_DIR="${HOME}/.kernel-ccache"
export CC="ccache gcc"
export PATH="/usr/lib/ccache:$PATH"
KERNEL=$(basename ${KERNEL_URL})
DIR=${KERNEL/.tar.*//}

mkdir -p ${BUILD}
cd ${BUILD}

if [ ! -e ${DIR} ]; then
    echo Extracting ${ARTIFACTS}/${KERNEL}
    TEMP=$(mktemp -d -p ${BUILD})
    mkdir ${TEMP}/${DIR}
    trap "rm -rf ${TEMP}" exit

    tar xf ${ARTIFACTS}/${KERNEL} -C ${TEMP}/${DIR} --strip-components=1
    mv ${TEMP}/${DIR} ${DIR}
fi


cd ${DIR}
cp ${CONFIG}/kernel-config .config

make oldconfig
make -j$(nproc) tar-pkg

list_build_files | tar -czf build.tar.gz -T /dev/stdin

mkdir -p ${DIST}/kernel
mv linux*.tar ${DIST}/kernel
gzip ${DIST}/kernel/linux*.tar
mv build.tar.gz ${DIST}/kernel