# kernel26 global smage functions
# $Header: /magellan-cvs/smage/include/kernel26.sminc,v 1.25 2008/05/24 09:33:17 niro Exp $

# needed extra vars:
#   ${KERNEL_TYPE}:   needed, 'sources' or 'image'
#   ${BRANCH}:        needed, style branch of the kernel
#   ${KERNEL_CONFIG}: optional, needed if you want to override the default
#                     searchpath ${SOURCEDIR}/${PNAME}/config-${PVER}-${BRANCH}-${PBUILD}
#
#   ${PSUBVER}:       optional, only needed for 2.6.x.x naming scheme
#   ${EXTRAVERSION}:  optinal, extra version for the kernel name
#                     default setting is ${PSUBVER}-${BRANCH}-${PBUILD}
#   ${KERNEL_IMAGE_PATH}: override the default KERNEL_IMAGE_PATH (to build xen images for e.g.)

# remove me when all distris support this:
if [[ ${USE_KERNEL_ARCH_EXTENSION} = true ]]
then
	KERNEL_ARCH_EXTENSION="-${ARCH}"
else
	KERNEL_ARCH_EXTENSION=""
fi

# some sane defaults
: ${SRCFILE="linux-${PVER/${PSUBVER}/}.tar.bz2"}
: ${SRCDIR="${BUILDDIR}/linux-${PVER}-${BRANCH}-${PBUILD}"}

: ${SRC_URI=(
	http://www.kernel.org/pub/linux/kernel/v${PVER:0:3}/${SRCFILE}
	mirror://kernel26-${BRANCH}/${SRCFILE}
	mirror://kernel26-${BRANCH}/config-${PVER}-${BRANCH}-${PBUILD}-i686
	mirror://kernel26-${BRANCH}/config-${PVER}-${BRANCH}-${PBUILD}-x86_64
)}

: ${DEPEND=">= sys-apps/module-init-tools-3.2
	>= sys-fs/udev-115
	>= sys-apps/hotplug-20040401
	>= sys-apps/mkinitrd-5.0.8
	>= sys-apps/initscripts-0.4.3"}

: ${PROVIDE="virtual/kernel"}

EXTRAVERSION="${PSUBVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}"
KERNEL_CONFIG="${SOURCEDIR}/${PNAME}/config-${PVER}-${BRANCH}-${PBUILD}-${ARCH}"

# special vars for mage file only
KPVER="${PVER}"
KPBUILD="${PBUILD}"
KBRANCH="${BRANCH}"
SPECIAL_VARS="${SPECIAL_VARS} KPVER KPBUILD KBRANCH"

kernel26_src_prepare()
{
	munpack ${SRCFILE} || die
	mv ${BUILDDIR}/linux-${PVER/${PSUBVER}/} ${SRCDIR} || die

	# fix permissions
	chown -R 0:0 ${SRCDIR} || die
	chmod -R a+r-w+X,u+w ${SRCDIR} || die

	cd ${SRCDIR}

	# fixes INSTALL_PATH to /boot and EXTRAVERSION
	sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' \
		-e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
}

kernel26_src_compile()
{
	cd ${SRCDIR}

	make mrproper || die

	# inject our kernel config
	cp ${KERNEL_CONFIG} ${SRCDIR}/.config || die
	make oldconfig || die

	case ${KERNEL_TYPE} in
		image)
			mmake ARCH=${ARCH/i*86/x86} || die
			;;

		sources)
			make clean || die

			# needed to compile other programs like iptables
			make ARCH=${ARCH/i*86/x86} prepare || die
			# needed to cover >=2.6.14 builds
			# but deprecated with >=2.6.21, prepare cover all targets there
			[[ $(echo ${PVER} | sed "s:\.::g") < 2621 ]] && { make ARCH=${ARCH/i*86/x86} prepare-all || die; }
			make ARCH=${ARCH/i*86/x86} scripts || die

			# at least alsa-drivers needs this one ...
			touch include/linux/autoconf.h || die
			;;
	esac
}

kernel26_image_src_install()
{
	cd ${SRCDIR}

	# needed directories
	install -d ${BINDIR}/boot || die

	# install modules
	make INSTALL_MOD_PATH=${BINDIR} modules_install || die

	# install kernelimage
	if [[ -z ${KERNEL_IMAGE_PATH} ]]
	then
		local my_arch="${ARCH}"
		[[ ${my_arch} = i*86 ]] && my_arch=i386
		install -m 0644 -o root -g root \
			arch/${my_arch}/boot/bzImage \
			${BINDIR}/boot/kernel-${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION} \
			|| die
	else
		install -m 0644 -o root -g root \
			${KERNEL_IMAGE_PATH} \
			${BINDIR}/boot/kernel-${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION} \
			|| die
	fi

	# install System.map
	install -m 0644 -o root -g root \
		System.map \
		${BINDIR}/boot/System.map-${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION} \
		|| die

	# install kernel description
	echo "
KRNVER=${BRANCH}-${PVER}-${ARCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}
KRNLIB=${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}
KRNIMG=kernel-${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}
KRNINITRD=
" > ${BINDIR}/boot/kernelversion || die

	# install kernel-config from srcdir
	install -m 0644 -o root -g root \
		.config \
		${BINDIR}/boot/config-${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION} \
		|| die

	# fix build symlink
	if [ -L ${BINDIR}/lib/modules/${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}/build ]
	then
		echo "fixing build symlink"
		rm ${BINDIR}/lib/modules/${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}/build || die
		ln -snf /usr/src/linux-${PVER}-${BRANCH}-${PBUILD} \
			${BINDIR}/lib/modules/${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}/build \
			|| die
	fi

	# and fixing source symlink
	if [ -L ${BINDIR}/lib/modules/${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}/source ]
	then
		echo "fixing source symlink"
		rm ${BINDIR}/lib/modules/${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}/source || die
		ln -snf /usr/src/linux-${PVER}-${BRANCH}-${PBUILD} \
			${BINDIR}/lib/modules/${PVER}-${BRANCH}-${PBUILD}${KERNEL_ARCH_EXTENSION}/source \
			|| die
	fi
}

kernel26_sources_src_install()
{
	cd ${BUILDDIR}

	echo "Creating linux-${PVER}-${BRANCH}-${PBUILD} sources tarball ... "
	tar cvjf ${BUILDDIR}/linux-${PVER}-${BRANCH}-${PBUILD}.tar.bz2 $(basename ${SRCDIR}) || die

	echo "Moving linux-${PVER}-${BRANCH}-${PBUILD} tarball to \${BINDIR}/usr/src ... "
	install -d ${BINDIR}/usr/src || die
	mv ${BUILDDIR}/linux-${PVER}-${BRANCH}-${PBUILD}.tar.bz2 ${BINDIR}/usr/src || die
}

# installs module-sources path/to/SRCDIR to MODDIR/MODNAME
# kernel26_external_modules_install path/to/SRCDIR DESTDIRNAME
kernel26_external_modules_install()
{
	cd ${BUILDDIR}

	local modsrc="$1"
	local moddest="$2"
	local moddir="${BUILDDIR}/kernel-modules-${PVER}-${BRANCH}-${PBUILD}"

	echo "Installing ${modsrc} to ${moddir}/${moddest} ..."
	install -d ${moddir} || die
	mv ${modsrc} ${moddir}/${moddest} || die
}

kernel26_external_modules_tarball()
{
	cd ${BUILDDIR}

	echo "Creating kernel-modules-${PVER}-${BRANCH}-${PBUILD} sources tarball ... "
	tar cvjf ${BUILDDIR}/kernel-modules-${PVER}-${BRANCH}-${PBUILD}.tar.bz2 \
		kernel-modules-${PVER}-${BRANCH}-${PBUILD} || die

	echo "Moving kernel-modules-${PVER}-${BRANCH}-${PBUILD} tarball to \${BINDIR}/usr/src ... "
	install -d ${BINDIR}/usr/src || die
	mv ${BUILDDIR}/kernel-modules-${PVER}-${BRANCH}-${PBUILD}.tar.bz2 ${BINDIR}/usr/src || die
}

kernel26_src_install()
{
	case ${KERNEL_TYPE} in
		image)
			kernel26_image_src_install || die
			;;

		sources)
			kernel26_sources_src_install || die
			;;
	esac
}

kernel_major_version()
{
	local ksrc="$@"
	local kv

	if [[ -z ${ksrc} ]]
	then
		kv="$(uname -r|cut -d. -f1-2)"
	else
		local version
		local patchlevel

		# get version from makefile
		version=$(grep "^VERSION[[:space:]]*=[[:space:]]*[[:digit:]]" ${ksrc}/Makefile | sed "s/^.*=[[:space:]]*\([[:digit:]]\+\)/\1/g")
		# get patchlevel from makefile
		patchlevel=$(grep "^PATCHLEVEL[[:space:]]*=[[:space:]]*[[:digit:]]" ${ksrc}/Makefile | sed "s/^.*=[[:space:]]*\([[:digit:]]\+\)/\1/g")
		# kernelversion
		kv="${version}.${patchlevel}"
	fi

	echo "${kv}"
}

mod_suffix()
{
	local ksrc="$@"
	local mod_suffix

	if [[ $(kernel_major_version ${ksrc}) = 2.6 ]]
	then
		mod_suffix="ko"
	else
		mod_suffix="o"
	fi

	echo ${mod_suffix}
}

kernel26_image_preinstall()
{
	if [[ -z ${MROOT} ]] || [[ ${MROOT} = / ]]
	then
		mount /boot &> /dev/null
	fi
}

kernel26_image_preremove()
{
	if [[ -z ${MROOT} ]] || [[ ${MROOT} = / ]]
	then
		mount /boot &> /dev/null
	fi
}

kernel26_image_postinstall()
{
	[ ! -d ${MROOT}/sys ] && install -d ${MROOT}/sys

	# fixes a small glitch in <=mage-0.3.6-r15 with symlinks
	[ -f ${MROOT}/usr/src/linux-${KPVER}-${KBRANCH}-${KPBUILD} ] && \
		rm ${MROOT}/usr/src/linux-${KPVER}-${KBRANCH}-${KPBUILD}

	[ -x ${MROOT}/sbin/depmod ] &&
		${MROOT}/sbin/depmod -ae \
			-F /boot/System.map-${KPVER}-${KBRANCH}-${KPBUILD} \
			${KPVER}-${KBRANCH}-${KPBUILD}

	# do not run this if ${MROOT} is set !
	if [[ -z ${MROOT} ]] || [[ ${MROOT} = / ]]
	then
		new-kernel-pkg -v --mkinitrd --make-default --install ${KPVER}-${KBRANCH}-${KPBUILD}
	fi

	# symlink actual kernel to /boot/vmlinuz etc...
	ln -snf kernel-${KPVER}-${KBRANCH}-${KPBUILD} ${MROOT}/boot/vmlinuz
	ln -snf System.map-${KPVER}-${KBRANCH}-${KPBUILD} ${MROOT}/boot/System.map
	ln -snf config-${KPVER}-${KBRANCH}-${KPBUILD} ${MROOT}/boot/config
	[[ -f ${MROOT}/boot/initrd-${KPVER}-${KBRANCH}-${KPBUILD}.img ]] &&
		ln -snf initrd-${KPVER}-${KBRANCH}-${KPBUILD}.img ${MROOT}/boot/initrd
}

kernel26_sources_postinstall()
{
	if [ ! -d ${MROOT}/usr/src/linux-${KPVER}-${KBRANCH}-${KPBUILD} ]
	then
		echo "Unpacking linux-${KPVER}-${KBRANCH}-${KPBUILD} source tarball ... "
		tar xvjf ${MROOT}/usr/src/linux-${KPVER}-${KBRANCH}-${KPBUILD}.tar.bz2 -C ${MROOT}/usr/src
	fi

	if [ ! -d ${MROOT}/usr/src/kernel-modules-${KPVER}-${KBRANCH}-${KPBUILD} ] &&
		[ -f ${MROOT}/usr/src/kernel-modules-${KPVER}-${KBRANCH}-${KPBUILD}.tar.bz2 ]
	then
		echo "Unpacking kernel-modules-${KPVER}-${KBRANCH}-${KPBUILD} source tarball ... "
		tar xvjf ${MROOT}/usr/src/kernel-modules-${KPVER}-${KBRANCH}-${KPBUILD}.tar.bz2 -C ${MROOT}/usr/src
	fi

	# if not exist create linux symlink
	if [ ! -h ${MROOT}/usr/src/linux ]
	then
		echo "Creating linux -> linux-${KPVER}-${KBRANCH}-${KPBUILD} symlink ... "
		[ ! -d ${MROOT}/usr/src ] && install ${MROOT}/usr/src
		ln -snf ${MROOT}/usr/src/linux-${KPVER}-${KBRANCH}-${KPBUILD} \
			${MROOT}/usr/src/linux || die
	fi

	# if not exist create kernel-modules symlink
	if [ ! -h ${MROOT}/usr/src/kernel-modules ]
	then
		echo "Creating kernel-modules -> kernel-modules-${KPVER}-${KBRANCH}-${KPBUILD} symlink ... "
		[ ! -d ${MROOT}/usr/src ] && install ${MROOT}/usr/src
		ln -snf ${MROOT}/usr/src/kernel-modules-${KPVER}-${KBRANCH}-${KPBUILD} \
			${MROOT}/usr/src/kernel-modules || die
	fi
}

export_inherits kernel26 src_prepare src_compile src_install

# export pre/postinstall functions depending on KERNEL_TYPE
case ${KERNEL_TYPE} in
	image)
		export_inherits kernel26_image preinstall preremove postinstall
		SPECIAL_FUNCTIONS="${SPECIAL_FUNCTIONS} kernel26_image_preinstall kernel26_image_preremove kernel26_image_postinstall"
		;;
	sources)
		export_inherits kernel26_sources postinstall
		SPECIAL_FUNCTIONS="${SPECIAL_FUNCTIONS} kernel26_sources_postinstall"
		;;
esac