#!/bin/bash
source /etc/functions.magic
###
#  kernel installation script
#  Copyright (C) Thomas "ShALLaX" Pedley (gentoox@shallax.com)
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
###

export drive="e"
KERNELVERSION="linux-2.4.37"
KERNELEXT=".tar.bz2"
KERNELMD5="e4197b25bfddacee61490921c885b2ec"
PATCHLEVEL="${KERNELVER}"
$important

clear
rm -rf /tmp/kernel*
echo "This will update your kernel to '${KERNELVERSION}'"
echo ""
echo "Changelog"
echo "========="
echo ""
echo "2437001: Upgrade to 2.4.37."
echo "2434001: Disabled TCP Explicit Congestion notification, upgrade to 2.4.34.2..."
echo "2432002: Disabled iptables debugging, disabled crypto test, enabled raid."
echo "2432001: New kernel version - 2.4.32-Gentoox, new .config - no modules."
echo "2422019: Added an autorepeat patch to the XboxIR driver."
echo "2422018: Build FatX into the kernel."
echo "2422017: .config tweaks, new naming convention."
echo "22016: FatX fixes (case sensitive bug).  Removed MCE support."
echo "22015: Cache vanilla kernel, extended FatX, rename to -xbox-Gentoox."
echo "22014: mremap() bug fix: http://www.k-otik.com/exploits/03.01.mremap_pte.c.php"
echo "22013: Preliminary Xcalibur HDTV support."
echo "22012: USB + Network now compiled into the kernel."
echo "22011: Focus S-Video support."
echo "22010: Preliminary Xcalibur (Xbox v1.6 support).  MCE support."
echo "22009: Fixed NTSC Focus support."
echo "22008: Backported i2c and xboxfb from 2.4.26 (i.e. HDTV Focus support)."
echo "22007: Fix for http://linuxreviews.org/news/2004-06-11_kernel_crash/index.html"
echo "22006: Fixed NTSC video positioning and colours."
echo "22005: Focus HOC and VOC support (Overscan fix) and Focus RGB support."
echo "22004: OpenMosix support."
echo "22003: Focus and HDTV support."
sleep 15
clear 
$busy

###
# Install module-rebuild to make reinstalling alsa-drivers easier!
###
echo "Emerging module-rebuild..."
emerge module-rebuild
failCheck emerge

###
# Mount the drive to be worked on.
###
mount /mnt/fatx/$drive 2> /dev/null 1> /dev/null
mount -o remount,rw /mnt/fatx/$drive 2> /dev/null 1> /dev/null

clear

###
# If the kernel cache directory doesnt exist, make it
###

echo -n "Searching for kernel cache directory... "
sleep 2
if [ ! -d /usr/share/gentoox/kernel ]; then
   echo -e "${redtxt}missing${normaltxt}!"
   sleep 1
   echo -n "Creating kernel cache directory... "
   sleep 2
   mkdir -p /usr/share/gentoox/kernel
   if [ $? == 0 ]; then
      echo -e "${greentxt}done${normaltxt}."
      sleep 1
   else
      echo -e "${redtxt}failed${normaltxt}."
      sleep 1
      exit 1
   fi
else
   echo -e "${greentxt}found${normaltxt}."
fi

sleep 1

cd /usr/share/gentoox/kernel

###
# If there is no kernel, we obviously need to download it.
###
echo -n "Searching for vanilla kernel... "
sleep 2
if [ ! -f ./${KERNELVERSION}${KERNELEXT} ]; then
   echo -e "${redtxt}missing${normaltxt}!"
   sleep 1
   echo -n "Downloading vanilla kernel... "
   sleep 2
   $downloading
   $wget http://www.kernel.org/pub/linux/kernel/v2.4/${KERNELVERSION}${KERNELEXT} 1> /dev/null 2> /dev/null
   failCheck download
   echo -e "${greentxt}done${normaltxt}."
else 
   echo -e "${greentxt}found${normaltxt}."
fi

sleep 1

###
# Verify the kernel is original.
###

echo -n "Verifying kernel authenticity... "
sleep 2
if [ `md5sum ./${KERNELVERSION}${KERNELEXT} | awk '{ print $1 }'` != ${KERNELMD5} ]; then
   echo -e "${redtxt}failed${normaltxt}!"
   $busy
   echo -n "Invalid kernel source package, redownloading... "

   ###
   # Retry forever... good idea, bad idea?
   ###
   while [ `md5sum ./${KERNELVERSION}${KERNELEXT} | awk '{ print $1 }'` != ${KERNELMD5} ]; do
      rm -rf ./${KERNELVERSION}${KERNELEXT}
      $downloading
      $wget http://www.kernel.org/pub/linux/kernel/v2.4/${KERNELVERSION}${KERNELEXT} 1> /dev/null 2> /dev/null
      failCheck download
   done

   echo -e "${greentxt}done${normaltxt}."
   
else
   echo -e "${greentxt}passed${normaltxt}."
fi

sleep 1

$busy

cd /usr/src/
if [ -z `grep -m1 -i kernel-downloaded${PATCHLEVEL} /etc/conf.d/magic-database` ]; then
   echo -n "Cleaning out old kernel... "
   sleep 2
   rm -rf /usr/src/linux
   rm -rf /usr/src/${KERNELVERSION}*
   echo -e "${greentxt}done${normaltxt}."
   sleep 1

   $busy
   echo -n "Extracting vanilla kernel source... "
   sleep 2
   tar -jxf /usr/share/gentoox/kernel/${KERNELVERSION}${KERNELEXT}
   failCheck decompress
   echo -e "${greentxt}done${normaltxt}."
   sleep 1

   mv /usr/src/${KERNELVERSION} /usr/src/${KERNELVERSION}-${DISTRO}
   ln -sf /usr/src/${KERNELVERSION}-${DISTRO} /usr/src/linux

   cd /usr/share/gentoox/kernel
   echo -n "Getting kernel patches... "
   sleep 2
   rm -rf ./kernelpatches${PATCHLEVEL}.diff*
   $downloading
   $wget --limit-rate $limitrate $gentooxurl/patch-files/kernelpatches${PATCHLEVEL}.diff.bz2 1> /dev/null 2> /dev/null
   failCheck download
   echo -e "${greentxt}done${normaltxt}."

   $busy
   echo -n "Applying kernel patches... "
   sleep 2
   bunzip2 ./kernelpatches${PATCHLEVEL}.diff.bz2
   failCheck decompress
   cd /usr/src/linux
   patch -p1 < /usr/share/gentoox/kernel/kernelpatches${PATCHLEVEL}.diff 1> /dev/null 2> /dev/null
   if [ $? == 0 ]; then
      echo -e "${greentxt}done${normaltxt}."
      sleep 1
   else
      echo -e "${redtxt}failed${normaltxt}."
      sleep 1
      exit 1
   fi

   ###
   # Put the config in place
   ###
   mv /usr/src/linux/kernel.config /usr/src/linux/.config

   ###
   # The next line of code stops the kernel from being redownloaded.  This is
   # useful incase something goes wrong with the compilation and the script
   # needs to be re-executed - stops the kernel from being redownloaded which
   # wastes bandwidth and time.  Delete this file or run
   # "magic fix kernel" to make magic redownload the source
   ###

   echo "kernel-downloaded${PATCHLEVEL}" >> /etc/conf.d/magic-database
fi
clear
cd /usr/src/linux

$busy

###
# Initialise the .config
###
make oldconfig
clear

###
# make the kernel and install it
###
make clean && make dep && make bzImage modules modules_install
sleep 5

mount -o remount,rw /mnt/fatx/$drive 2> /dev/null 1> /dev/null
mv /mnt/fatx/$drive/vmlinuz /mnt/fatx/$drive/oldlinuz
echo "Installing new kernel to /mnt/fatx/$drive/vmlinuz"
cp /usr/src/linux/arch/i386/boot/bzImage /mnt/fatx/$drive/vmlinuz
sleep 2

$busy

clear 

echo "Running module-rebuild..."
module-rebuild rebuild || exit 0