#!/bin/bash
# $Id$

gen_minkernpackage() {
	print_info 1 'Creating minimal kernel package'
	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 -xj -C ${TEMP}/minkernpackage -f ${KERNCACHE} kernel-${ARCH}-${KV}
		/bin/tar -xj -C ${TEMP}/minkernpackage -f ${KERNCACHE} config-${ARCH}-${KV}
		if isTrue "${GENZIMAGE}"
		then
			/bin/tar -xj -C ${TEMP}/minkernpackage -f ${KERNCACHE} kernelz-${ARCH}-${KV}
		fi
	else
		local tmp_kernel_binary=$(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 "${KERNEL_DIR}"
		cp "${tmp_kernel_binary}" "${TEMP}/minkernpackage/kernel-${KV}" || gen_die 'Could not the copy kernel for the min kernel package!'
		cp ".config" "${TEMP}/minkernpackage/config-${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-${KV}" || gen_die "Could not copy the kernelz for the min kernel package"
		fi
	fi

	if ! isTrue "${INTEGRATED_INITRAMFS}"
	then
		[ "${BUILD_RAMDISK}" != '0' ] && { cp "${TMPDIR}/initramfs-${KV}" "${TEMP}/minkernpackage/initramfs-${ARCH}-${KV}" || gen_die 'Could not copy the initramfs for the kernel package!'; }
	fi

	if [ "${KERNCACHE}" != "" ]
	then
		/bin/tar -xj -C ${TEMP}/minkernpackage -f ${KERNCACHE} System.map-${ARCH}-${KV}
	else
		cp "${KERNEL_DIR}/System.map" "${TEMP}/minkernpackage/System.map-${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}" && rm -rf "${TEMP}/minkernpackage" > /dev/null 2>&1
}

gen_modulespackage() {
	print_info 1 'Creating modules package'
	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 a modules package ${INSTALL_MOD_PATH}/lib/modules/${KV} was not found"
	fi
	cd "${TEMP}" && rm -rf "${TEMP}/modulespackage" > /dev/null 2>&1
}
gen_kerncache()
{
	print_info 1 'Creating kernel cache'
	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 "${KERNEL_DIR}"
	cp "${tmp_kernel_binary}" "${TEMP}/kerncache/kernel-${ARCH}-${KV}" || gen_die 'Could not the copy kernel for the kernel package!'
	cp "${KERNEL_DIR}/.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 "${KERNEL_DIR}/System.map" "${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}" && rm -rf "${TEMP}/kerncache" > /dev/null 2>&1
}

gen_kerncache_extract_kernel()
{
	/bin/tar -f ${KERNCACHE} -C ${TEMP} -xj
	copy_image_with_preserve "kernel" \
		"${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 -xjf ${KERNCACHE} -C ${INSTALL_MOD_PATH} lib
		else
        		/bin/tar -xjf ${KERNCACHE} -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 -xjf ${KERNCACHE} -C /etc/kernels config-${ARCH}-${KV}
		mv /etc/kernels/config-${ARCH}-${KV} /etc/kernels/kernel-config-${ARCH}-${KV}
	fi
}

gen_kerncache_is_valid()
{
	KERNCACHE_IS_VALID=0
	if [ "${NO_KERNEL_SOURCES}" = '1' ]
	then

		BUILD_KERNEL=0
		# Can make this more secure ....

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

			/bin/tar -xj -f ${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=1
				fi
			fi
		fi
	fi
	export KERNCACHE_IS_VALID
	return 1
}