Kernel Make, KABI, Install, and Reboot script

The below is a script we use to build and boot a system. We will be working to make more of our tooling publicly available and will update wiki pages and entries with reliant redirects.

Note you can also rip this apart and into sub components to do compile and KABI checks without installing and rebooting. We will leave that as an exercise for the reader.

#!/bin/bash
#set -x

pwd

BRANCH=$(git branch | grep \* | cut -d ' ' -f2)

START=$(date +%s)
START_MRPROPER=$(date +%s)
if [ -e .config ]; then
    make mrproper | tee "/tmp/${BRANCH}_make_mrproper.log"
    if [ $? -ne 0 ]; then
        echo "Error: make mrproper failed"
        echo "[TIMER]{MRPROPER} $(( $(date +%s) - $START_MRPROPER ))s"
        exit 1
    fi
else
    echo "no .config file found, moving on"
fi

END_MRPROPER=$(date +%s)
echo "[TIMER]{MRPROPER}: $(( $END_MRPROPER - $START_MRPROPER ))s"


ARCH=$(uname -m)
if [ "x86_64" == "${ARCH}" ] || [ "aarch64" == "${ARCH}" ]; then
    VERSION=$(uname -r | cut -d '-' -f1)
    echo "x86_64 architecture detected, copying config"
    if [ -f configs/kernel-${VERSION}-${ARCH}.config ]; then
	cp -v configs/kernel-${VERSION}-${ARCH}.config .config
    elif [ -f configs/kernel-${ARCH}-rhel.config ]; then
	cp -v configs/kernel-${ARCH}-rhel.config .config
    else
	echo "Error: Config file not found"
	exit 1
    fi
else
    echo "Error: Unsupported architecture"
    exit 1
fi

echo "Setting Local Version for build"
sed -i_bak "s/CONFIG_LOCALVERSION=\"\"/CONFIG_LOCALVERSION=\"-${BRANCH}\"/g" .config
grep "CONFIG_LOCALVERSION=" .config    

echo "Making olddefconfig"
make olddefconfig

START_BUILD=$(date +%s)
echo "Starting Build"
make -j$(nproc)
if [ $? -ne 0 ]; then
    echo "Error: Build failed"
    echo "[TIMER]{BUILD} $(( $(date +%s) - $START_BUILD ))s"
    exit 1
fi
END_BUILD=$(date +%s)
echo "[TIMER]{BUILD}: $(( $END_BUILD - $START_BUILD ))s"

echo "Making Modules"
START_MODULES=$(date +%s)
sudo INSTALL_MOD_STRIP=1 make modules_install
if [ $? -ne 0 ]; then
    echo "Error: Modules install failed"
    echo "[TIMER]{MODULES} $(( $(date +%s) - $START_MODULES ))s"
    exit 1
fi
END_MODULES=$(date +%s)
echo "[TIMER]{MODULES}: $(( $END_MODULES - $START_MODULES ))s"

echo "Making Install"
START_INSTALL=$(date +%s)
sudo make install
if [ $? -ne 0 ]; then
    echo "Error: Install failed"
    echo "[TIMER]{INSTALL} $(( $(date +%s) - $START_INSTALL ))s"
    exit 1
fi
END_INSTALL=$(date +%s)
echo "[TIMER]{INSTALL}: $(( $END_INSTALL - $START_INSTALL ))s"

echo "Checking kABI"
# ../kernel-dist-git/SOURCES/check-kabi -k ../kernel-dist-git/SOURCES/Module.kabi_x86_64 -s Module.symvers || echo "kABI failed"
KABI_CHECK=$(../kernel-dist-git/SOURCES/check-kabi -k ../kernel-dist-git/SOURCES/Module.kabi_${ARCH} -s Module.symvers)
if [ $? -ne 0 ]; then
    echo "Error: kABI check failed"
    exit 1
fi
echo "kABI check passed"

GRUB_INFO=$(sudo grubby --info=ALL | grep -E "^kernel|^index")

AWK_RES=$(awk -F '=' -v INDEX=0 -v KERNEL="" -v FINAL_INDEX=0 -v BRANCH="${BRANCH}" \
    '{if ($2 ~/^[0-9]+$/) {INDEX=$2}} {if ($2 ~BRANCH) {KERNEL=$2; FINAL_INDEX=INDEX}} END {print FINAL_INDEX"  "KERNEL}' \
    <<< "${GRUB_INFO}")
if [ $? -ne 0 ]; then
    echo "Error: awk failed"
    exit 1
fi
read -r INDEX KERNEL <<< "${AWK_RES}"

KERNEL=$(echo ${KERNEL} | sed 's/\"//g')

echo "Setting Default Kernel to ${KERNEL} and Index to ${INDEX}"
sudo grubby --set-default-index=${INDEX}
if [ $? -ne 0 ]; then
    echo "Error: grubby failed"
    exit 1
fi
sudo grubby --set-default=${KERNEL}
if [ $? -ne 0 ]; then
    echo "Error: grubby failed"
    exit 1
fi
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
if [ $? -ne 0 ]; then
    echo "Error: grub2-mkconfig failed"
    exit 1
fi

echo "Hopefully Grub2.0 took everything ... rebooting after time metrices"


END=$(date +%s)
DIFF=$(( $END - $START ))
echo "[TIMER]{MRPROPER}: $(( $END_MRPROPER - $START_MRPROPER ))s"
echo "[TIMER]{BUILD}: $(( $END_BUILD - $START_BUILD ))s"
echo "[TIMER]{MODULES}: $(( $END_MODULES - $START_MODULES ))s"
echo "[TIMER]{INSTALL}: $(( $END_INSTALL - $START_INSTALL ))s"
echo "[TIMER]{TOTAL} ${DIFF}s"

echo "Rebooting in 10 seconds"
sleep 10
sudo reboot