# Copyright 1999-2003 Gentoo Technologies, Inc.
# Distributed under the terms of the GNU General Public License v2
# $Header: 

IUSE="build supermount xfs acpi nforce2 bootsplash swapprefetch freqscal grsec"

ETYPE="sources"
inherit kernel || die

# OKV=original kernel version, KV=patched kernel version.
OKV="2.4.21"
KV="2.4.21-ck${PR/r/}"
S=${WORKDIR}/linux-${KV}
EXTRAVERSION="-ck${PR/r/}"

DESCRIPTION="Full sources for the Con Kolivas's high performance kernel and its optional features"
HOMEPAGE="http://members.optusnet.com.au/ckolivas/kernel"

### Below is a list of all the available patches:

## Main CK performance patch (O(1)B,PE,LL,CKVM,RL2,VH,ST,DT123)
MAIN_PATCH="linux-${KV}.patch.bz2"

## Extra features:
# Supermount-NG v1.2.7:
# USE=supermount (local)
SM_PATCH="1050_SM1.2.7_0305310109_${KV}.patch.bz2"
# XFS file system:
# USE=xfs (global)
XFS_PATCH="1060_XFS_0305311351_${KV}.patch.bz2"
# ACPI 20030522:
# USE=acpi (global - should use "acpi4linux"?)
ACPI_PATCH="1070_ACPI_0305311044_${KV}.patch.bz2"
# Nvidia Nforce2 update:
# USE=nforce2 (local)
NF2_PATCH="1080_NF2_0305311048_${KV}.patch.bz2"
# Bootsplash:
# USE=bootsplash (local)
BS_PATCH="1090_BS_0306020027_${KV}.patch.bz2"

## Misc other patches:
# Swap prefetching:
# USE=swapprefetch (local)
SP_PATCH="1011_SP_0306102217_${KV}.diff.bz2"
# CPU Frequency scaling for supported laptops:
# USE=freqscal (local)
CFS_PATCH="1100_CFS_0305311539_${KV}.patch.bz2"
# Grsec 1.9.9h (depends on 1010 and 1060):
# USE=grsec (local)
GRS_PATCH="1161_GRS1.9.9h_0306081216_${KV}.patch.bz2"


### Create the SRC_URI from USE flags.
CK_URL="http://members.optusnet.com.au/ckolivas/kernel"
SRC_URI="http://www.kernel.org/pub/linux/kernel/v2.4/linux-${OKV}.tar.bz2 \
		${CK_URL}/${MAIN_PATCH} \
		supermount? ( ${CK_URL}/${SM_PATCH} ) \
		xfs? ( ${CK_URL}/${XFS_PATCH} ) \
		grsec? ( ${CK_URL}/${XFS_PATCH} ) \
		acpi? ( ${CK_URL}/${ACPI_PATCH} ) \
		nforce2? ( ${CK_URL}/${NF2_PATCH} ) \
		bootsplash? ( ${CK_URL}/${BS_PATCH} ) \
		swapprefetch? ( ${CK_URL}/${SP_PATCH} ) \
		freqscal? ( ${CK_URL}/${CFS_PATCH} ) \
		grsec? ( ${CK_URL}/${GRS_PATCH} ) "

KEYWORDS="~x86 -ppc"
SLOT="${KV}"

src_unpack() {
	
	# Symlink optional patches, taking the dependencies into account.
	[ -n "`use supermount`" ] && ( ln -s ${DISTDIR}/${SM_PATCH} || die )
	[ -n "`use xfs`" -o -n "`use grsec`" ] && ( ln -s ${DISTDIR}/${XFS_PATCH} || die )
	[ -n "`use acpi`" ] && ( ln -s ${DISTDIR}/${ACPI_PATCH} || die )
	[ -n "`use nforce2`" ] && ( ln -s ${DISTDIR}/${NF2_PATCH} || die )
	[ -n "`use bootsplah`" ] && ( ln -s ${DISTDIR}/${BS_PATCH} || die )
	[ -n "`use swapprefetch`" ] && ( ln -s ${DISTDIR}/${SP_PATCH} || die )
	[ -n "`use freqscal`" ] && ( ln -s ${DISTDIR}/${CFS_PATCH} || die )
	[ -n "`use grsec`" ] && ( ln -s ${DISTDIR}/${GRS_PATCH} || die )

	# Unpack the vanilla sources
	unpack linux-${OKV}.tar.bz2
	
	# Apply the main patch 
	einfo "Apply patch ${MAIN_PATCH}"
	bzcat ${DISTDIR}/${MAIN_PATCH} | patch -p0 || die "Patching with ${MAIN_PATCH} failed."	
		  
	# Apply the extra symlinked patches. (-p1)
	cd linux-${OKV}
	for PATCH in ../1*
	do
		einfo "Apply patch ${PATCH/\.\.\//}"
		bzcat ${PATCH} | patch -p1 || die "Patching with ${PATCH/\.\.\//} failed."
	done
	cd ..

	# Rename the kernel
	mv linux-${OKV} linux-${KV} || die
	
	# Do the usual cleanups
	cd linux-${KV}
	kernel_universal_unpack
}