#!/bin/bash -e

# prepare-kernel-sources.sh - To be documented
# License:  BSD-style (for this file only)
# Revision: 250312

#---------------------------------------------------------------------

# Some rules:
#
# 1. This script must be run  interactively  due  to the  use of "make
# menuconfig (which needs to be run at least once initially).
#
# 2. To use this script,  you need to be in an  xterm that is at least
# 80x25 characters in size.
#
# 3. This script must be run in the directory that contains the assoc-
# iated files (such as the original  Linux  kernel source tarball that
# it starts with).
#
# 4. This script needs write access to the directory in question.
#
# 5. This script includes  a "program parameters" section.  Be sure to
# review the comments  in the section in question  before  setting the
# parameters therein.

#---------------------------------------------------------------------
# Program parameters.

CFGLOCAL="-250312-64"           # Set  this to  the  value of  CONFIG_
                                # LOCALVERSION. Should be of the form:
                                # dash, 6-digit date, dash 32 or 64 to
                                # indicate 32 or 64 bits

LINUXREL=6.12.18                # Set this to the Linux kernel release
                                # string (generally of the form #.#.#)

# Set EXT3DIR to an absolute path for a folder in  a  filesystem  that
# has plenty of disk space free. If the folder does not already exist,
# this script will attempt to create it.

# The  user  must have  read-write access to  the  directory  in which
# $EXT3DIR resides and to $EXT3DIR itself. A  temporary directory will
# be created in $EXT3DIR and then deleted.  KERNTMPDIR  specifies  the
# name of the temporary directory (without a path component).

# Depending on various factors, some types of filesystems may not work
# for this purpose; i.e., to hold $EXT3DIR.  If problems occur,  try a
# filesystem of type "ext3" or "ext4".

EXT3DIR=/ram/kernelsbuilt
KERNTMPDIR=tmpkernel

#---------------------------------------------------------------------
# Additional setup.

KERNTMPPATH=$EXT3DIR/$KERNTMPDIR
SDIR=`pwd`
XDIRNAME=linux-$LINUXREL
XKERNBALL=$XDIRNAME.tar.xz
NDIRNAME=kernel$CFGLOCAL
NKERNBALL=$NDIRNAME.tar.bz2
export FORCECFLAGS64=yes

if [ \! -f config.kernel ]; then
    echo Error: Must be run in same directory as config.kernel
    exit 1
fi

if [ \! -f $XKERNBALL ]; then
    echo Error: Must be run in same directory as $XKERNBALL
    exit 1
fi

mkdir -p $EXT3DIR
rm -fr   $KERNTMPPATH
mkdir -p $KERNTMPPATH
cd       $KERNTMPPATH

rm -fr $XDIRNAME $NDIRNAME $NKERNBALL

echo Unpacking a tarball, this may take a while

tar Jxf $SDIR/$XKERNBALL
mv $XDIRNAME $NDIRNAME
cd $NDIRNAME

cp -p $SDIR/config.kernel .config
cp -p $SDIR/build-kernel.sh .
chmod 755   build-kernel.sh

for x in $SDIR/kernel*.patch
do
    patch -p1 < $x
done

#---------------------------------------------------------------------
# Try to disable WiFi LEDs (the blinking is annoying).

for x in `find . -type f -name Kconfig`
do
    sed -e "/select MAC80211_LEDS/d" -i $x
done

sed -e "/CONFIG_MAC80211_LEDS=/d"   \
    -e "/CONFIG_RTL8187_LEDS=/d"    \
    -e "/CONFIG_B43_LEDS=/d"        \
    -e "/CONFIG_B43LEGACY_LEDS=/d"  \
    -e "/CONFIG_P54_LEDS=/d"        \
    -i .config

#---------------------------------------------------------------------
# Remaining steps.

make menuconfig                 # This must be run at least once
cp -p .config $SDIR/config.kernel

cd ..
echo Creating a tarball, this may take a while

tar cf - $NDIRNAME | pbzip2 -c > $NKERNBALL
mv       $NKERNBALL $SDIR/
cd                  $SDIR/
rm -fr   $KERNTMPPATH
tardate  $NKERNBALL
ls -l    $NKERNBALL

echo Done