# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header:
#
# xnu.eclass is based on kswap.sh v1.0.0b5 2003/06/09 1125 -7 gmt 
# written by jean-pierre mouilleseaux
# http://opendarwin.org/~jpm/naughty/darwin/kswap.sh
# jpm@opendarwin.org
#
# this eclass provides the functions to simplify booting from an
# alternative mach_kernel without having to overwrite the currently
# booted kernel (which is very bad, mmk?)

ECLASS=xnu
INHERITED="$INHERITED $ECLASS"
EXPORT_FUNCTIONS src_unpack src_compile src_install pkg_postrm

# to prevent errors if theres no sources in /usr/src
# we set KV and re-set it later on as well.
[ -z "${KV}" ] && KV=${PV}

HOMEPAGE="http://www.opendarwin.org/ http://www.gentoo.org/" 
LICENSE="GPL-2"
IUSE=""
#SLOT="${KV}"
SLOT="0"

DEPEND="=sys-darwin/bootstrap_cmds-44
		=sys-darwin/Libstreams-23
		=sys-darwin/cctools-495.8
		=sys-darwin/kext_tools-42
		"


##
# Variables and Constants
#=================================================================

# Grab kernel version from KV
KV_MAJOR=$(echo ${KV} | cut -d. -f1)
KV_MINOR=$(echo ${KV} | cut -d. -f2)
KV_PATCH=$(echo ${KV} | cut -d. -f3)
KV_PATCH=${KV_PATCH/[-_]*/}

RKV_MAJOR=$(uname -v | cut -d - -f2 | cut -d . -f1)
RKV_MINOR=$(uname -v | cut -d - -f2 | cut -d . -f2)
RKV_PATCH=$(uname -v | cut -d - -f2 | cut -d . -f1)

RKV=${RKV_MAJOR}"."${RKV_MINOR}"."${RKV_PATCH}

KERNEL_STABLE="mach_kernel"
KERNEL_DEV="mach_kernel-${KV}"

KERNEL=""

#powerpc
BOOTFILE_BASE=""

#x86
DEFAULT_TABLE="/private/Drivers/i386/System.config/Default.table"

PERMS=""
PERMS_644='-rw-r--r--'

COMMA=","
SLASH="/"

##
# Custom functions
#=================================================================
kernel_check() {

	# make sure kernel of interest exists
	if [ ! -f ${SLASH}${KERNEL} ]; then
		echo "error:" ${SLASH}${KERNEL} "does not exist"
		exit 1
	fi
	
	# verify kernel file is owned by root
	if [ ! -O ${SLASH}${KERNEL} ]; then
		echo "error:" ${SLASH}${KERNEL} "is not owned by root"
		echo "setting ownership to root..."
		chown root ${SLASH}${KERNEL}
	fi
	
	# check kernel file permissions
	if [ `ls -l ${SLASH}${KERNEL} | awk '{print $1}'` != ${PERMS_644} ]; then
		echo "error:" ${SLASH}${KERNEL} "does not have the proper permissions of 644"
		echo "setting permissions to 644"
		chmod 644 ${SLASH}${KERNEL}
	fi
}

#
# function to tell OF which kernel to boot on powerpc
#
set_bootfile() {
	BOOTFILE_BASE=`nvram boot-device | awk -F , '{print $1}' | awk '{print $2}'`
	
	if [ ! BOOTFILE_BASE ] ; then
		echo "error: bootfile_base = <null>"
		exit 1
	fi;
	
	nvram boot-file=${BOOTFILE_BASE}${COMMA}${KERNEL}
	nvram -p | grep boot-file
	einfo "========================================================================"
	echo
	einfo "active kernel upon reboot: ${KERNEL}"
	echo
	einfo "If you have problems booting, reset your pram by holding down"
	einfo "command-option-p-r through 3 boot chimes, this will revert to the default"
	einfo "kernel."
	echo
	einfo "========================================================================"
	
}

#
# default boot action for i386
#
set_defaulttable() {
	KERNEL=`echo ${KERNEL} | sed "s/^\///"`
	`cp ${DEFAULT_TABLE} ${DEFAULT_TABLE}.old`
	`sed "s/^\"Kernel\" = \"[a-z_0-9A-Z.\-]*\"/\"Kernel\" = \"${KERNEL}\"/" ${DEFAULT_TABLE} > ${DEFAULT_TABLE}.new`
	`mv ${DEFAULT_TABLE}.new ${DEFAULT_TABLE}`
}

##
# install gentoo xnu
##
gentookernel () {	
	KERNEL=${KERNEL_DEV}

	kernel_check
	
	if [ `uname -p` == "powerpc" ]; then
		set_bootfile
	elif [ `uname -p` == "i386" ]; then
		set_defaulttable
	else
		echo "error: xnu will currently only run on powerpc and x86 hardware."
		exit 1
	fi;	
}

##
# install default xnu
##
defaultkernel () {	
	KERNEL=${KERNEL_STABLE}
	
	einfo "========================================================================"
	echo
	einfo " Reverting back to stable kernel"
	echo
	einfo "========================================================================"	

	kernel_check
	
	if [ `uname -p` == "powerpc" ]; then
		set_bootfile
	elif [ `uname -p` == "i386" ]; then
		set_defaulttable
	fi
}

##
# install xnu sources
##
xnusources() {	
	cd ${S}
	dodir /usr/src
	einfo ">>> Copying sources..."
	cp -R ${S} ${D}/usr/src/xnu-${PV}
	#if [ ! -h ${D}/usr/src/xnu ]
	#then
	#	ln -sf ${D}/usr/src/xnu-${KV} ${D}/usr/src/xnu
	#fi
}

##
# common functions
#=================================================================

xnu_src_unpack() {
	
	cd ${WORKDIR}
	unpack xnu-${PV}.tar.gz
	
	cd ${S}/makedefs
	sed -i -e 's:^export RELPATH = .*:export RELPATH = /usr/bin/relpath:' MakeInc.cmd
	sed -i -e 's:^SEG_HACK = .*:SEG_HACK = /usr/bin/seg_hack:' MakeInc.cmd
	sed -i -e 's:^DECOMMENT = .*:DECOMMENT = /usr/bin/decomment:' MakeInc.cmd
	
	cd ${S}/libsa/conf
	sed -i -e 's|/usr/local/lib|/usr/lib|g' Makefile.template

	cd ${S}/config
	sed -i -e 's|/usr/local/bin|/usr/bin|g' Makefile
}

xnu_src_compile() {
	cd ${S}
	emake installhdrs RC_OS=macos || die "xnu headers failed"
	emake RC_OS=macos || die "xnu build failed"
}

xnu_src_install() {
	cd ${S}/BUILD/obj/RELEASE_PPC/
	# this can overwrite the running kernel..BAD IDEA, needs to be fixed
	cp mach_kernel /mach_kernel-${KV}
	if [ ${PV} == ${RKV} ]; then
		einfo "Apple...we have a problem....Installing Gentoo xnu kernel"
		einfo "Moooooo.....Roooooooaaaaaaar"
		gentookernel
	else
		KERNEL=${KERNEL_DEV}
		kernel_check
		NVCOMMAND=`nvram boot-device | awk -F , '{print $1}' | awk '{print $2}'`
		einfo "You are running a different version of xnu than this one,"
		einfo "this is NOT reccomended. If you really want to boot this kernel type"
		echo
		einfo "	nvram boot-file=${NVCOMMAND}${COMMA}${KERNEL}"
		echo
		einfo "and reboot... then start praying to his royal steveness"
	fi
	xnusources
}

xnu_pkg_postrm() {
	defaultkernel
	# we should probably clean up /usr/include and the System.Framework in the future
	rm -rf /usr/src/xnu-${PV}
}