#!/bin/sh
#
# Author: Yuri <nE0sIghT> Konotopov
# License: GNU GPL v3 or any later version
#

source /lib/gentoo/functions.sh

set -eo pipefail

VORTEX_CACHE_DIR="/var/cache/vortex-build"

if [ "$EUID" -ne 0 ]; then
    exec sudo "${0}" "$@"
fi

MENUCONFIG=0
while [[ $# != 0 ]]; do
	case $1 in
		-m|--menuconfig)
			VORTEX_BUILD_DIR="$(mktemp -d)"
			VORTEX_CONFIG="vortex-$(date "+%s")"

			mkdir -p "${VORTEX_CACHE_DIR}"

			cp -r /usr/src/linux/. "${VORTEX_BUILD_DIR}"

			pushd "${VORTEX_BUILD_DIR}" > /dev/null

			make mrproper
			zcat /proc/config.gz > .config
			make menuconfig
			cp .config "${VORTEX_CACHE_DIR}/${VORTEX_CONFIG}"

			popd > /dev/null

			rm -r "${VORTEX_BUILD_DIR}"

			export VORTEX_MENUCONFIG="${VORTEX_CONFIG}"
		;;
		--) shift; break;;
		*)
			ewarn Unknown option provided: "${1}"
		;;
	esac

	shift
done

MODULES_DIR="/lib/modules/$(uname -r)"
TIMESTAMP="$(date "+%s")"

if test -e "${MODULES_DIR}"; then
	ebegin "Backing up ${MODULES_DIR}"
	mv "${MODULES_DIR}" "${MODULES_DIR}.${TIMESTAMP}"
	eend $?
fi

ebegin "Building kernel"
emerge -1v gentoo-kernel
eend $?

ebegin "Rebuilding modules"
if ! emerge @module-rebuild; then
	eend 1

	if test -e "${MODULES_DIR}.${TIMESTAMP}"; then
		ebegin "Reverting backup ${MODULES_DIR}"
		mv "${MODULES_DIR}.${TIMESTAMP}" "${${MODULES_DIR}}"
		eend $?
	fi

	exit 1
fi

if test -e "${MODULES_DIR}.${TIMESTAMP}"; then
	ebegin "Dropping modules backup ${MODULES_DIR}"
	rm -r "${MODULES_DIR}.${TIMESTAMP}"
	eend $?
fi