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#!/bin/bash
#
# Script for building the Linux kernel from git. It aims to build a kernel image
# that is suitable for running in a virtual machine and is aimed to used for
# testing.
#
# Usage: build-linux.sh [REPO-URL] [BRANCH|TAG] [OUTPUT-FILE] [...CONFIGS]
#
# Where [..CONFIGS] can be any number of configuration options, e.g.
# --enable CONFIG_DRM_VKMS
set -e
# From scripts/subarch.include in linux
function get-subarch()
{
uname -m | sed -e s/i.86/x86/ \
-e s/x86_64/x86/ \
-e s/sun4u/sparc64/ \
-e s/arm.*/arm/ -e s/sa110/arm/ \
-e s/s390x/s390/ -e s/parisc64/parisc/ \
-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
-e s/riscv.*/riscv/
}
REPO="$1"
BRANCH_OR_TAG="$(cat $2)"
IMAGE="$3"
ARCH=$(uname -m)
SUBARCH=$(get-subarch)
shift
shift
shift
# ./scripts/config --enable CONFIG_DRM_VKMS
CONFIGS=()
while [[ "x$1" != "x" ]]; do
CONFIGS+=( "$1" )
shift
done
echo Building Linux for $ARCH \($SUBARCH\)...
set -x
if [ -d linux ]; then
pushd linux
git fetch $REPO $BRANCH_OR_TAG
git checkout FETCH_HEAD
else
git clone --depth=1 --branch=$BRANCH_OR_TAG $REPO linux
pushd linux
fi
make defconfig
sync
make kvm_guest.config
echo Enabling ${CONFIGS[@]}...
./scripts/config ${CONFIGS[@]/#/--enable }
make oldconfig
make -j8 WERROR=0
popd
TARGET_DIR="$(dirname "$IMAGE")"
mkdir -p "$TARGET_DIR"
mv linux/arch/$SUBARCH/boot/bzImage "$IMAGE"
mv linux/.config $TARGET_DIR/.config
#rm -rf linux
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