#!/bin/bash
# $Id$

source /etc/installer.conf
source ${INSTALLER_DIR}/include/hwdetection.sh

: ${INSTALL_ROOT="/mnt/magellan"}

create_device_map()
{
	local chroot

	[[ ! -z ${INSTALL_ROOT} ]] && chroot=chrooted

	# create device.map
	${chroot} grub --batch --no-floppy --no-config-file --device-map=/boot/grub/device.map </dev/null
}

install_grub()
{
	local chroot
	local grub_disk

	if [[ -z ${PARTITION_DISK_BOOT} ]]
	then
		grub_disk="${PARTITION_DISK_ROOT}"
	else
		grub_disk="${PARTITION_DISK_BOOT}"
	fi

	[[ ! -z ${INSTALL_ROOT} ]] && chroot=chrooted

	# update grub
	${chroot} grub --batch --no-floppy << EOF
root $(convert_device ${grub_disk})
setup $(convert_device ${grub_disk} | sed "s:,[0-9]::")
quit
EOF

	return 0
}

convert_device()
{
	local device="$1"
	local root_part=

	# extract device type (block) and major number for root drive
	local major_minor=$(ls -Ll ${device} | awk '{if ($6 < 64) printf("%c%d0", $1, $5); else printf("%c%d1", $1, $5)}')

	# find the matching BIOS device
	for bios_drive in $(grep -v '^#' ${INSTALL_ROOT}/boot/grub/device.map | awk '{print $2}')
	do
		bios_major_minor=$(ls -Ll ${bios_drive} 2>/dev/null | awk '{if ($6 < 64) printf("%c%d0", $1, $5); else printf("%c%d1", $1, $5)}')

		if [[ ${major_minor} = ${bios_major_minor} ]]
		then
			# we found it
			root_drive=$(grep ${bios_drive} ${INSTALL_ROOT}/boot/grub/device.map | awk '{print $1}')
			root_part=$(ls -Ll ${device} | awk '{print $6}')
			root_part=$(( ${root_part} % 16 - 1 ))
			break
		fi
	done

	drive=$(echo ${root_drive} | sed "s:)$:,${root_part}):")
	echo ${drive}
}

add_grub_conf()
{
	echo "$@" >> ${INSTALL_ROOT}/boot/grub/grub.conf
}

create_grub_conf()
{
	local splashimage
	local grub_disk

	if [[ -z ${PARTITION_DISK_BOOT} ]]
	then
		grub_disk="${PARTITION_DISK_ROOT}"
	else
		grub_disk="${PARTITION_DISK_BOOT}"
	fi

	# create an empty one
	:> ${INSTALL_ROOT}/boot/grub/grub.conf

	add_grub_conf "default 0"
	add_grub_conf "timeout 10"
	add_grub_conf ""

	# our splashimage
	splashimage="magellan.xpm.gz"

	# forcefully use gfxsplash
	[[ ! -f ${INSTALL_ROOT}/boot/${splashimage} ]] && cp ${INSTALLER_DIR}/data/magellan-black2.xpm.gz ${INSTALL_ROOT}/boot/${splashimage}

	if [[ -f ${INSTALL_ROOT}/boot/${splashimage} ]]
	then
		add_grub_conf "# splash image"
		add_grub_conf "splashimage $(convert_device ${grub_disk})/boot/${splashimage}"
		add_grub_conf "foreground FFFFFF"
		add_grub_conf "background 253861"

		add_grub_conf ""
	else
		add_grub_conf "# some pretty colors"
		add_grub_conf "color cyan/blue white/blue"
		add_grub_conf ""
	fi

	add_grub_conf "title Magellan-Linux $(< ${INSTALL_ROOT}/etc/mageversion) ($(readlink ${INSTALL_ROOT}/boot/vmlinuz | sed s:kernel-::))"
	add_grub_conf "root $(convert_device ${grub_disk})"
	add_grub_conf "kernel /boot/$(readlink ${INSTALL_ROOT}/boot/vmlinuz) root=UUID=$(get_uuid ${PARTITION_DISK_ROOT})"
	add_grub_conf "initrd /boot/$(readlink ${INSTALL_ROOT}/boot/initrd)"

	# add an empty line as spacer between other boot entries
	add_grub_conf ""
}

install_bootloader()
{
	create_device_map >> ${INSTALLER_LOG} 2>&1
	echo 25
	create_grub_conf >> ${INSTALLER_LOG} 2>&1
	echo 50
	install_grub >> ${INSTALLER_LOG} 2>&1
	echo 100
}