#! /bin/sh
# Script to apply kernel patches.
#   usage: patch-kernel [ sourcedir [ patchdir ] ]
#     The source directory defaults to /usr/src/linux, and the patch
#     directory defaults to the current directory.
#
# It determines the current kernel version from the top-level Makefile.
# It then looks for patches for the next sublevel in the patch directory.
# This is applied using "patch -p1 -s" from within the kernel directory.
# A check is then made for "*.rej" files to see if the patch was
# successful.  If it is, then all of the "*.orig" files are removed.
#
#       Nick Holloway <Nick.Holloway@alfie.demon.co.uk>, 2nd January 1995.
#
# Added support for handling multiple types of compression. What includes
# gzip, bzip, bzip2, zip, compress, and plaintext. 
#
#       Adam Sulmicki <adam@cfar.umd.edu>, 1st January 1997.

# Set directories from arguments, or use defaults.
sourcedir=${1-/usr/src/linux}
patchdir=${2-.}

# set current VERSION, PATCHLEVEL, SUBLEVEL
eval `sed -n 's/^\([A-Z]*\) = \([0-9]*\)$/\1=\2/p' $sourcedir/Makefile`
if [ -z "$VERSION" -o -z "$PATCHLEVEL" -o -z "$SUBLEVEL" ]
then
    echo "unable to determine current kernel version" >&2
    exit 1
fi

echo "Current kernel version is $VERSION.$PATCHLEVEL.$SUBLEVEL"

while :
do
    SUBLEVEL=`expr $SUBLEVEL + 1`
    patch=patch-$VERSION.$PATCHLEVEL.$SUBLEVEL 
    if [ -r $patchdir/${patch}.gz ]; then
        ext=".gz"
        name="gzip"
        uncomp="gunzip -dc"
    elif [ -r $patchdir/${patch}.bz  ]; then
        ext=".bz"
	name="bzip"
        uncomp="bunzip -dc"
    elif [ -r $patchdir/${patch}.bz2 ]; then
        ext=".bz2"
        name="bzip2"
        uncomp="bunzip2 -dc"
    elif [ -r $patchdir/${patch}.zip ]; then
        ext=".zip"
        name="zip"
        uncomp="unzip -d"
    elif [ -r $patchdir/${patch}.Z ]; then
        ext=".Z"
        name="uncompress"
        uncomp="uncompress -c"
    elif [ -r $patchdir/${patch}     ]; then
        ext=""
        name="plaintext"
        uncomp="cat"
    else
	break
    fi

    echo -n "Applying ${patch} (${name})... "
    if $uncomp ${patchdir}/${patch}${ext} | patch -p1 -s -N -E -d $sourcedir
    then
        echo "done."
    else
        echo "failed.  Clean up yourself."
        break
    fi
    if [ "`find $sourcedir/ '(' -name '*.rej' -o -name '.*.rej' ')' -print`" ]
    then
        echo "Aborting.  Reject files found."
        break
    fi
    # Remove backup files
    find $sourcedir/ '(' -name '*.orig' -o -name '.*.orig' ')' -exec rm -f {} \;
done
