#!/bin/sh

usage()
{
	echo "Usage: new-kernel linux-2.4.2-pre2 linux-2.4.3-pre3 linux-2.4.3 patch.gz cvs-dir"
	exit 1
}

wantdir()
{
	if [ x$1 = x ]
	then
		usage
	fi
	if [ ! -d $1 ]
	then
		echo "directory $1 does not exist"
		usage
	fi
}

wantfile()
{
	if [ x$1 = x ]
	then
		usage
	fi
	if [ ! -f $1 ]
	then
		echo "file $1 does not exist"
		usage
	fi
}

doit()
{
	echo $* 1>&2
	$* || {
		echo oops
		exit 1 
	}
}


CURRENT_KERNEL=$1
NEXT_KERNEL=$2
BASE_KERNEL=$3
PATCH_FILE=$4
CVS_DIR=$5

TEMP_PATCH=$(mktemp /tmp/patch-XXXXXX)
MY_DIFF="$CURRENT_KERNEL"--"$NEXT_KERNEL"

wantdir $CURRENT_KERNEL
wantdir $BASE_KERNEL
wantdir $CVS_DIR
wantfile $PATCH_FILE

doit rm -rf $NEXT_KERNEL
doit cp -a $BASE_KERNEL $NEXT_KERNEL
doit rm -f $TEMP_PATCH
doit gunzip < $PATCH_FILE > $TEMP_PATCH
cd $NEXT_KERNEL
doit patch -p1 --dry-run -i $TEMP_PATCH
doit patch -p1 -s -i $TEMP_PATCH
echo cd ..
cd ..

echo diff -uNrp $CURRENT_KERNEL $NEXT_KERNEL
diff -uNrp $CURRENT_KERNEL $NEXT_KERNEL > $MY_DIFF

echo cd $CVS_DIR
cd $CVS_DIR
doit patch -p1 --dry-run -s -i ../$MY_DIFF
doit patch -p1 -s -i ../$MY_DIFF
cvs-take-patch ../$MY_DIFF
cvs commit -m "'doing $NEXT_KERNEL'"
cvs update -ko -d -P

TAG=$(echo $NEXT_KERNEL | sed -e 's@\.@_@g')
cvs tag $TAG
rm -f $TEMP_PATCH