debian_kernel_build_from_upstream_source

#!/usr/bin/env bash
# This script will build debian kernel package from the upstream stable kernel

get_elapsed_time="/usr/bin/time -f"
build_dir=/home/bhaskar/git-linux/debian_kernel_build
existing_config_file="/boot/config-$(uname -r)"


debian_kernel_build() {

# Check if build dir exists, if not then pull and build

if [ ! -d "$build_dir" ];then
	echo Gosh! It will take hell lot of time to clone the repo ...take a break ...
	echo
	$get_elapsed_time "\n\n\tTime Elapsed: %E\n\n" git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git $HOME/git-linux/debian_kernel_build

 else
	 echo Dir exists!! Getting into the git repo ...

         cd $build_dir || exit 1
fi

echo Cleaning previous stale stuff and pull new stuffs in

 git reset --hard

 git clean -dfx

 git pull

# echo Getting the build dependencies for kernel build :
# echo

# apt install devscripts
# /usr/bin/mk-build-deps

#Clean the dir
make clean && make mrproper

#Copying existing/running kernel config
cp $existing_config_file .config
ls -al .config

#Disable this option to shorten the compile time
scripts/config --disable DEBUG_KERNEL
grep DEBUG_KERNEL .config

#Disable this option to shorten the compile time
scripts/config --disable DEBUG_INFO
grep DEBUG_INFO .config

#This is needed ,otherwise it won't allow you to build
scripts/config --disable system_trusted_keys
grep CONFIG_SYSTEM_TRUSTED_KEYS .config

#Make sure the flags symbols are set correctly with an updated value
make  ARCH=x86_64 olddefconfig

# Now build it
$get_elapsed_time "\n\n\tTime Elapsed: %E\n\n" make ARCH=x86_64 V=1 -j$(getconf _NPROCESSORS_ONLN) deb-pkg


 printf "\n\n\n ${Bright}${Green}Install the generated packages aka kernel,headers,modules et al ${NOCOLOR}\n\n\n"

 cd ..

 dpkg -i *.deb

if [ $? -eq 0 ];then

     find /boot -maxdepth 1 -name "vmlinuz-*" -type f -ls

      notify-send "Kernel update process done"
else
	notify-send "Nope, the package install have trouble."
fi


}
debian_kernel_build