#!/bin/bash
cd /usr/src/linux
# save your .config file
echo "[NEWKERNEL] Old .config file saved in ~/config-bak."
cp -i .config ~/config-bak
# clean the linux sources
echo "[NEWKERNEL] Cleaning old kernel out..."
make mrproper
cd ..

# download the kernel and patches
echo "updating your portage tree..."
emerge --sync
echo "[NEWKERNEL] Merging new sources..."
emerge gentoo-sources

# delete old version (the directory can remain)
emerge -P gentoo-sources

# make a new link to actual linux sources
echo "[NEWKERNEL] Creating new link..."
SRC=`ls -t --format=single-column | grep linux- | head -n 1`
ln -sf $SRC linux

# prepare config
echo "[NEWKERNEL] Grabbing new config..."
cd $SRC
# original line is: 
# zcat /proc/config.gz > .config
# 
cp -f ~/config-bak .config
echo "[NEWKERNEL] Delete the backup of the kernel configuration?"
rm -i ~/config-bak

# compile and install it (with ccache)
echo "[NEWKERNEL] Building new kernel..."
PATH="/usr/lib/ccache/bin:$PATH"
make && make modules_install && make install

# merge all necessary modules
echo "[NEWKERNEL] Installing necessary modules..."
emerge ipw2200 alsa-driver
emerge -u alsa-lib alsa-utils