#! /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.

# 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.gz 
    if [ ! -r $patchdir/$patch ]
    then
        break
    fi

    echo -n "Applying $patch... "
    if gunzip -dc $patchdir/$patch | 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
