gentoo kenel update script

kernel-update.sh

#!/bin/bash

src='/usr/src'

# Get current version
cur_ver="linux-`uname -r`"

# Get new version
ver=`ls $src | grep linux- | sort -V | tail -1`

path="$src/$ver"

if [[ $cur_ver = $ver ]]; then
    echo "Already on Latest Version"

    read -r -p "Run menuconfig? [Y/n] " response
    response=${response,,} # tolower
    if ! [[ $response =~ ^(no|n)$ ]]; then
        ( cd $path && make menuconfig )
    fi
else
    echo "Performing Upgrade $cur_ver -> $ver"
    config="$src/$cur_ver/.config"

    if [ ! -f "$config" ]; then
        echo "Cannot find old config ($config)"
        exit
    fi
    echo "Copying old config"
    cp $config "$path/"

    echo "Running config upgrade"
    ( cd $path && make oldconfig )

    echo "Relinking kernel and fixing permissions"
    eselect kernel set $ver
    # TODO: make a callback from gentoo-sources update
    #chown squ1rr:users "$src/linux"
    #chown -R squ1rr:users $path

    read -r -p "Run menuconfig? [y/N] " response
    response=${response,,} # tolower
    if [[ $response =~ ^(yes|y)$ ]]; then
        ( cd $path && make menuconfig )
    fi
fi


echo "Building kernel"
( cd $path && make -j9 )
( cd $path && make modules_install )

bzimage="$path/arch/x86_64/boot/bzImage"
if [ ! -f "$bzimage" ]; then
    echo "Kernel compilation failed"
    exit
fi

ending=${cur_ver//linux-/}

echo "Backing up current initramfs"
mkdir -p /boot/bak
cp /boot/initramfs-*-$ending /boot/bak/

echo "Making initramfs"
genkernel initramfs
if [[ $? -ne 0 ]]; then
    echo "Genkernel failed"
    exit
fi

echo "Backing up current kernel"
if [[ $ver != $cur_ver ]]; then
    rm /boot/initramfs-*-$ending
fi
mv /boot/kernel-$cur_ver /boot/bak/

echo "Moving kernel to boot"
cp $path/arch/x86_64/boot/bzImage /boot/kernel-$ver

echo "Re-generating grub"
grub-mkconfig -o /boot/grub/grub.cfg

read -r -p "Rebuild module-dependent packages? [Y/n] " response
response=${response,,} # tolower
if [[ ! $response =~ ^(no|n)$ ]]; then
    echo "Rebuilding module-dependent packages"
    emerge @module-rebuild
fi

read -r -p "Reboot the system? [Y/n] " response
response=${response,,} # tolower
if [[ ! $response =~ ^(no|n)$ ]]; then
    sudo reboot
fi