#!/bin/bash

function die()
{
	echo " (EE) $1"
	exit 1
}

function info()
{
	echo " (II) $1"
}

function silent()
{
	OUTPUT=`$*`
	if [ "$?" != "0" ]; then
		echo $OUTPUT
		die "$* failed!"
	fi
}

if [ ! -f "./.config" ]; then
	CURDIR=`pwd`
	die "No kernel .config exists in $CURDIR!"
fi

if [ ! -f "./Makefile" ]; then
	die "No Makefile present!"
fi

NAME=`cat include/config/kernel.release`

if [ -z "$NAME" ]
then
    die "Could not determine kernel version!"
fi

info "Detected kernel version $NAME"

if [ $UID != "0" ]; then
	die "Must be root to install kernel!"
fi

# (1) copy modules
if [ "$1" != "-m" ]; then
	info "Installing modules..."
	silent make -j8 modules_install
else
	info "Skipping installing modules."
fi

# (2) copy kernel
info "Installing kernel..."
silent cp -v arch/i386/boot/bzImage /boot/vmlinuz-$NAME
silent cp -v System.map             /boot/System.map-$NAME

# (3) build ramdisk
info "Building module dependencies"
silent depmod -v $NAME

info "Building initial ramdisk..."
silent mkinitcpio -g /boot/kernel-$NAME.img -k $NAME

# (4) make bootloader entry
ALREADY_PRESENT=`grep "kernel /boot/vmlinuz-$NAME" /boot/grub/menu.lst `

if [ ! -z "$ALREADY_PRESENT" ]; then
	info "Bootloader entry appears to be already present."
else
	info "Creating bootloader entry..."
	cat >> /boot/grub/menu.lst <<__EOE__

# Custom kernel
title  Kernel $NAME
root   (hd0,5)
kernel /boot/vmlinuz-$NAME root=/dev/sda6 ro vga=791
initrd /boot/kernel-$NAME.img
__EOE__

fi

info "Kernel $NAME has been installed."