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#!/bin/bash
# $Id$

gen_minkernpackage() {
	print_info 1 ''
	print_info 1 "Creating minimal kernel package in '${MINKERNPACKAGE}'..."
	rm -rf "${TEMP}/minkernpackage" > /dev/null 2>&1
	mkdir "${TEMP}/minkernpackage" || gen_die 'Could not make a directory for the kernel package!'
	if [ "${KERNCACHE}" != "" ]
	then
		/bin/tar -x -C ${TEMP}/minkernpackage -f ${KERNCACHE} kernel-${ARCH}-${KV}
		mv minkernpackage/{kernel-${ARCH}-${KV},kernel-${KNAME}-${ARCH}-${KV}}
		/bin/tar -x -C ${TEMP}/minkernpackage -f ${KERNCACHE} config-${ARCH}-${KV}
		mv minkernpackage/{config-${ARCH}-${KV},config-${KNAME}-${ARCH}-${KV}}
		if isTrue "${GENZIMAGE}"
		then
			/bin/tar -x -C ${TEMP}/minkernpackage -f ${KERNCACHE} kernelz-${ARCH}-${KV}
			mv minkernpackage/{kernelz-${ARCH}-${KV},kernelz-${KNAME}-${ARCH}-${KV}}
		fi
		if [ ! -f minkernpackage/kernel-${KNAME}-${ARCH}-${KV} \
			-o ! -f minkernpackage/config-${KNAME}-${ARCH}-${KV} ];
		then
			gen_die "Cannot locate kernel binary"
		fi
	else
		local tmp_kernel_binary=$(find_kernel_binary ${KERNEL_BINARY})
		local tmp_kernel_binary2=$(find_kernel_binary ${KERNEL_BINARY_2})
		if [ -z "${tmp_kernel_binary}" ]
		then
			gen_die "Cannot locate kernel binary"
		fi
		cd "${KERNEL_OUTPUTDIR}"
		cp "${tmp_kernel_binary}" "${TEMP}/minkernpackage/kernel-${KNAME}-${ARCH}-${KV}" || gen_die 'Could not the copy kernel for the min kernel package!'
		cp ".config" "${TEMP}/minkernpackage/config-${KNAME}-${ARCH}-${KV}" || gen_die 'Could not the copy kernel config for the min kernel package!'
		if isTrue "${GENZIMAGE}"
		then
			cp "${tmp_kernel_binary2}" "${TEMP}/minkernpackage/kernelz-${KNAME}-${ARCH}-${KV}" || gen_die "Could not copy the kernelz for the min kernel package"
		fi
	fi

	if ! isTrue "${INTEGRATED_INITRAMFS}"
	then
		isTrue "${BUILD_RAMDISK}" && { cp "${TMPDIR}/initramfs-${KV}" "${TEMP}/minkernpackage/initramfs-${KNAME}-${ARCH}-${KV}" || gen_die 'Could not copy the initramfs for the kernel package!'; }
	fi

	if [ "${KERNCACHE}" != "" ]
	then
		/bin/tar -x -C ${TEMP}/minkernpackage -f ${KERNCACHE} System.map-${ARCH}-${KV}
		mv minkernpackage/{System.map-${ARCH}-${KV},System.map-${KNAME}-${ARCH}-${KV}} ||
			gen_die 'Could not copy System.map from kerncache for the kernel package!'
	else
		cp "${KERNEL_OUTPUTDIR}/System.map" "${TEMP}/minkernpackage/System.map-${KNAME}-${ARCH}-${KV}" || gen_die 'Could not copy System.map for the kernel package!';
	fi

	cd "${TEMP}/minkernpackage"
	/bin/tar -jcpf ${MINKERNPACKAGE} * || gen_die 'Could not compress the kernel package!'

	cd "${TEMP}"
	isTrue "${CMD_DEBUGCLEANUP}" && rm -rf "${TEMP}/minkernpackage" > /dev/null
	return 0
}

gen_modulespackage() {
	print_info 1 ''
	print_info 1 "Creating modules package in '${MODULESPACKAGE}'..."
	rm -rf "${TEMP}/modulespackage" > /dev/null 2>&1
	mkdir "${TEMP}/modulespackage" || gen_die 'Could not make a directory for the kernel package!'

	if [ -d ${INSTALL_MOD_PATH}/lib/modules/${KV} ]
	then
		mkdir -p ${TEMP}/modulespackage/lib/modules
		cp -r "${INSTALL_MOD_PATH}/lib/modules/${KV}" "${TEMP}/modulespackage/lib/modules"
		cd "${TEMP}/modulespackage"
		/bin/tar -jcpf ${MODULESPACKAGE} * || gen_die 'Could not compress the modules package!'
	else
		print_info 1 "Could not create modules package, '${INSTALL_MOD_PATH}/lib/modules/${KV}' was not found"
	fi

	cd "${TEMP}"
	isTrue "${CMD_DEBUGCLEANUP}" && rm -rf "${TEMP}/modulespackage" > /dev/null
	return 0
}

gen_kerncache()
{
	print_info 1 ''
	print_info 1 "Creating kernel cache in '${KERNCACHE}'..."
	rm -rf "${TEMP}/kerncache" > /dev/null 2>&1
	mkdir "${TEMP}/kerncache" || gen_die 'Could not make a directory for the kernel cache!'

	local tmp_kernel_binary=$(find_kernel_binary ${KERNEL_BINARY})
	local tmp_kernel_binary2=$(find_kernel_binary ${KERNEL_BINARY_2})
	if [ -z "${tmp_kernel_binary}" ]
	then
		gen_die "Cannot locate kernel binary"
	fi

	cd "${KERNEL_OUTPUTDIR}"
	cp "${tmp_kernel_binary}" "${TEMP}/kerncache/kernel-${ARCH}-${KV}" || gen_die 'Could not the copy kernel for the kernel package!'
	cp "${KERNEL_OUTPUTDIR}/.config" "${TEMP}/kerncache/config-${ARCH}-${KV}"

	if [[ "$(file --brief --mime-type "${KERNEL_CONFIG}")" == application/x-gzip ]]; then
		# Support --kernel-config=/proc/config.gz, mainly
		zcat "${KERNEL_CONFIG}" > "${TEMP}/kerncache/config-${ARCH}-${KV}.orig"
	else
		cp "${KERNEL_CONFIG}" "${TEMP}/kerncache/config-${ARCH}-${KV}.orig"
	fi
	cp "${KERNEL_OUTPUTDIR}/System.map" "${TEMP}/kerncache/System.map-${ARCH}-${KV}"
	if isTrue "${GENZIMAGE}"
	then
		cp "${tmp_kernel_binary2}" "${TEMP}/kerncache/kernelz-${ARCH}-${KV}" || gen_die "Could not copy the kernelz for the kernel package"
	fi

	echo "VERSION = ${VER}" > "${TEMP}/kerncache/kerncache.config"
	echo "PATCHLEVEL = ${PAT}" >> "${TEMP}/kerncache/kerncache.config"
	echo "SUBLEVEL = ${SUB}" >> "${TEMP}/kerncache/kerncache.config"
	echo "EXTRAVERSION = ${EXV}" >> "${TEMP}/kerncache/kerncache.config"

	mkdir -p "${TEMP}/kerncache/lib/modules/"

	if [ -d ${INSTALL_MOD_PATH}/lib/modules/${KV} ]
	then
		cp -r "${INSTALL_MOD_PATH}/lib/modules/${KV}" "${TEMP}/kerncache/lib/modules"
	fi

	cd "${TEMP}/kerncache"
	/bin/tar -jcpf ${KERNCACHE} * || gen_die 'Could not compress the kernel package!'

	cd "${TEMP}"
	isTrue "${CMD_DEBUGCLEANUP}" && rm -rf "${TEMP}/kerncache" > /dev/null
	return 0
}

gen_kerncache_extract_kernel()
{
	/bin/tar -xf ${KERNCACHE} -C ${TEMP}
	copy_image_with_preserve "kernel" \
		"${TEMP}/kernel-${ARCH}-${KV}" \
		"kernel-${KNAME}-${ARCH}-${KV}"

	if isTrue "${GENZIMAGE}"
	then
		copy_image_with_preserve "kernelz" \
			"${TEMP}/kernelz-${ARCH}-${KV}" \
			"kernelz-${KNAME}-${ARCH}-${KV}"
	fi

	copy_image_with_preserve "System.map" \
		"${TEMP}/System.map-${ARCH}-${KV}" \
		"System.map-${KNAME}-${ARCH}-${KV}"
}

gen_kerncache_extract_modules()
{
	if [ -e "${KERNCACHE}" ]
	then
		print_info 1 'Extracting kerncache kernel modules'
		if [ "${INSTALL_MOD_PATH}" != '' ]
		then
			/bin/tar -xf ${KERNCACHE} --strip-components 1 -C ${INSTALL_MOD_PATH}/lib
		else
			/bin/tar -xf ${KERNCACHE} --strip-components 1 -C /lib
		fi
	fi
}

gen_kerncache_extract_config()
{
	if [ -e "${KERNCACHE}" ]
	then
		print_info 1 'Extracting kerncache config to /etc/kernels'
		mkdir -p /etc/kernels
		/bin/tar -xf ${KERNCACHE} -C /etc/kernels config-${ARCH}-${KV}
		mv /etc/kernels/config-${ARCH}-${KV} /etc/kernels/kernel-config-${ARCH}-${KV}
	fi
}

gen_kerncache_is_valid()
{
	KERNCACHE_IS_VALID="no"

	if [ -e "${KERNCACHE}" ]
	then
		if ! isTrue "${KERNEL_SOURCES}"
		then
			BUILD_KERNEL="no"
			# Can make this more secure ....

			/bin/tar -xf ${KERNCACHE} -C ${TEMP}
			if [ -e ${TEMP}/config-${ARCH}-${KV} -a -e ${TEMP}/kernel-${ARCH}-${KV} ]
			then
				print_info 1 'Valid kernel cache found; no sources will be used'
				KERNCACHE_IS_VALID="yes"
			fi
		else
			KERNEL_CONFIG="/${KERNEL_OUTPUTDIR}/.config"
			if [ "${CMD_KERNEL_CONFIG}" != '' ]
			then
				KERNEL_CONFIG="${CMD_KERNEL_CONFIG}"
			fi

			/bin/tar -xf ${KERNCACHE} -C ${TEMP}
			if [ -e ${TEMP}/config-${ARCH}-${KV} -a -e ${KERNEL_CONFIG} ]
			then

				if [ -e ${TEMP}/config-${ARCH}-${KV}.orig ]
				then
					test1=$(grep -v "^#" ${TEMP}/config-${ARCH}-${KV}.orig | md5sum | cut -d " " -f 1)
				else
					test1=$(grep -v "^#" ${TEMP}/config-${ARCH}-${KV} | md5sum | cut -d " " -f 1)
				fi

				if [[ "$(file --brief --mime-type "${KERNEL_CONFIG}")" == application/x-gzip ]]; then
					# Support --kernel-config=/proc/config.gz, mainly
					local CONFGREP=zgrep
				else
					local CONFGREP=grep
				fi
				test2=$("${CONFGREP}" -v "^#" ${KERNEL_CONFIG} | md5sum | cut -d " " -f 1)

				if [ "${test1}" == "${test2}" ]
				then
					echo
					print_info 1 "No kernel configuration change, skipping kernel build..."
					echo
					KERNCACHE_IS_VALID="yes"
				fi
			fi
		fi
	fi
	export KERNCACHE_IS_VALID
	return 1
}