#!/bin/bash

KERNELNAME="linux-2.6.12"
KERNELPKG="linux-2.6.12.tar.bz2"
KERNELPATCHPKG="patch-2.6.13-rc4.bz2"
#MMPKG="2.6.10-mm1.bz2"
RPPKG="realtime-preempt-2.6.13-rc4-RT-V0.7.52-10"
RTLSMPKG="realtime_lsm.patch"

KERNELSRCDIR="http://kernel.org/pub/linux/kernel/v2.6/"
KERNELPATCHSRCDIR="http://kernel.org/pub/linux/kernel/v2.6/testing/"
#MMSRCDIR="http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10/2.6.10-mm1/"
RPSRCDIR="http://redhat.com/~mingo/realtime-preempt/"
RPSRCDIRALT="http://redhat.com/~mingo/realtime-preempt/older/"
RTLSMSRCDIR="http://affenbande.org/~tapas/"

#are we done already?
echo
if [ -e $KERNELNAME-$RPPKG ]
then
  echo patched tree $KERNELNAME-$RPPKG already existing? bailing out..
  exit
fi


echo
echo getting $KERNELSRCDIR$KERNELPKG
if [ -e $KERNELPKG ]
then
  echo file already exists
else
  wget $KERNELSRCDIR$KERNELPKG
fi

if [ -e $KERNELPKG ]
then
  true
else
  echo still missing $KERNELPKG - bye bye
  exit
fi


echo
echo getting $KERNELPATCHSRCDIR$KERNELPATCHPKG
if [ -e $KERNELPATCHPKG ]
then
  echo file already exists
else
  wget $KERNELPATCHSRCDIR$KERNELPATCHPKG
fi

if [ -e $KERNELPATCHPKG ]
then
  true
else
  echo still missing $KERNELPATCHPKG - bye bye
  exit
fi


#echo
#echo getting $MMSRCDIR$MMPKG
#if [ -e $MMPKG ]
#then
#  echo file already exists
#else
#  wget $MMSRCDIR$MMPKG
#fi

#if [ -e $MMPKG ]
#then
#  true
#else
#  echo still missing $MMPKG - bye bye
#  exit
#fi


echo
echo getting $RPSRCDIR$RPPKG
if [ -e $RPPKG ]
then
  echo file already exists
else
  if wget $RPSRCDIR$RPPKG
  then
    true
  else
    echo patch outdated? trying "older/" dir for $RPPKG
    wget $RPSRCDIRALT$RPPKG
  fi
fi

if [ -e $RPPKG ]
then
  true
else
  echo still missing $RPPKG - bye bye
  exit
fi


echo
echo getting $RTLSMSRCDIR$RTLSMPKG
if [ -e $RTLSMPKG ]
then
  echo file already exists
else
  wget $RTLSMSRCDIR$RTLSMPKG
fi

if [ -e $RTLSMPKG ]
then
  true
else
  echo still missing $RTLSMPKG - bye bye
  exit
fi

echo
echo untarring $KERNELPKG - please wait [and then wait a little more]
if [ -e $KERNELNAME ]
then
  echo hmm, it seems a kernel dir seems to already exist. not untarring. exiting..
  exit
else
  tar xjf $KERNELPKG
fi


echo
echo entering kernel source dir
cd $KERNELNAME


echo
echo testing patch $KERNELPATCHPKG
if cat ../$KERNELPATCHPKG |bunzip2 |patch -p1 -t --dry-run
then
  echo dry run completed applying patch for real
cat ../$KERNELPATCHPKG |bunzip2 |patch -p1 -t
else
  echo something went wrong with $KERNELPATCHPKG. NOT applying for real.  exiting
  exit
fi

#echo
#echo testing patch $MMPKG
#if cat ../$MMPKG |bunzip2 |patch -p1 -t --dry-run
#then
#  echo dry run completed applying patch for real
#  cat ../$MMPKG |bunzip2 |patch -p1 -t
#else
#  echo something went wrong with $MMPKG, NOT applying for real.  exiting
#  exit
#fi

echo
echo testing patch $RPPKG
if cat ../$RPPKG |patch -p1 -t --dry-run
then
  echo dry run completed applying patch for real
  cat ../$RPPKG |patch -p1 -t
else
  echo something went wrong with $RPPKG, NOT applying for real.  exiting
  exit
fi

echo
echo testing patch $RTLSMPKG
if cat ../$RTLSMPKG |patch -p1 -t --dry-run
then
  echo dry run completed applying patch for real
  cat ../$RTLSMPKG |patch -p1 -t
else
  echo something went wrong with $RTLSMPKG, NOT applying for real.  exiting
  exit
fi

cd ..

echo
echo renaming kernel source dir to $KERNELNAME $KERNELNAME-$RPPKG
mv $KERNELNAME $KERNELNAME-$RPPKG