gentoo-build-kernel.sh

#/bin/bash

#######################################################
# Automatic kernel compilescript with old conf (gentoo)
#                   by ZappeL 2011
#
# requires root-privileges, awk, sort and a configured
# kernel is needed
#######################################################


LINUX=/usr/src/linux
NEWEST=$(find /usr/src/ -name 'linux-*-gentoo*' -print | sort -r | grep "" -m1)
CUR=/usr/src/linux-$(uname -r)
let JOBS=$(cat /proc/cpuinfo | grep "cpu cores" -m 1 | awk '{print $4}')+1

echo -en "Checking symlink..."
if [ -L $LINUX ]; then
        echo -en "\nRemoving old symlink.."
        rm $LINUX
fi
if [ ! -L $LINUX ]; then
        echo -e "\t\t\t\t\t\t [ok]"
else
        echo -e "\t\t\t\t\t\t [error]"
fi

echo -en "Creating new symlink for: "$NEWEST".."
ln -s $NEWEST $LINUX
if [ -L $LINUX ]; then
        echo -e "\t\t [ok]"
else
        echo -e "\t\t [error]"
fi

echo -en "Checking /boot directory.."
if [ -d /boot/ ]; then
        echo -en "\nFound /boot directory. \nChecking its contents.."
        let BCNT=$(ls /boot/ | wc -l)-1
        if [ $BCNT -lt 3 ]; then
                        echo -en "\nTt seems that the /boot directory is empty. \nTrying to mount it.."
                        mount /boot
                        let BCNT=$(ls /boot/ | wc -l)-1
                        if [ $BCNT -gt 2 ]; then
                                echo -e "\t\t\t\t\t\t [ok]"
                        else
                                echo -e "\t\t\t\t\t\t [error]"
                                echo -e "Problem with your /boot direcoty. \nPLEASE CHECK YOUR INSTALLATION!"
                                exit
                        fi
                else
                        echo -e "\t\t\t\t\t\t [ok]"
        fi
else
        echo -e "\t\t\t\t\t [error]"
        echo -e "No /boot direcoty found.. \nPLEASE CHECK YOUR INSTALLATION!"
        exit
fi

echo -en "Getting current .config.."
if [ -f "$CUR/.config" ];then
        echo -e "\t\t\t\t\t [ok]"
else
        echo -e "\t\t\t\t\t [error]\nCould not find current config, make sure it is placed in:"
        echo -e $CUR/.config
        exit
fi

echo -en "Copying config file.."
cp $CUR/.config $LINUX >/dev/null 2>&1
if [ -f $LINUX/.config ];then
        echo -e "\t\t\t\t\t\t [ok]"
else
        echo -e "\t\t\t\t\t\t [error]\nCould not copy .config to "$LINUX".\nPlease copy the file manually."
        exit
fi

echo -e "Preparing to build the kernel.."
cd $LINUX
echo -en "Building the Kernel, please standby..."
BZI=$(make -j$JOBS -s | awk '{print $2}')
echo -e "\t\t\t\t [ok]"

echo -en "Checking kernel image.."
if [ -f $LINUX/$BZI ]; then
        echo -e "\t\t\t\t\t\t [ok]"
else
        echo -e "\t\t\t\t\t\t [error]\nCoukd not find kernel image!\n Givin up!"
        exit
fi

echo -en "Installing the kernel.."
make -s modules_install
make -s install
if [ -e $(find /usr/src/ -name 'linux-*-gentoo*' -print | sort -r | grep '' -m1 | awk '{printf "/boot/vmlinuz%s\n",substr($1,15,255)}') ]; then
        echo -e "\t\t\t\t\t\t [ok]\nInstalltion complete.\nNext step is to check your bootloader configuration or simply reboot the system!"
else
        echo -e "\t\t\t\t\t\t [error]\nInstallation failed!\nPlease try manual installtion of the kernel."
fi

exit