#!/bin/sh

# This code is covered by the GNU General Public License (GPLv2 or higher)

set -e

. /usr/share/debconf/confmodule

log() {
	logger -t flash-kernel-installer "$@"
}

error() {
	log "error: $@"
	db_progress STOP
	exit 1
}

findfs () {
	mount | grep "on /target${1%/} " | cut -d' ' -f1
}

# Are we writing to flash or constructing an image on disk?
write_to_flash() {
	case "$machine" in
		"Buffalo Linkstation Pro/Live" | "Buffalo/Revogear Kurobox Pro" | "GLAN Tank" | "HP Media Vault mv2120" | "Marvell DB-MV88F6781-BP Development Board")
			return 1
		;;
		*)
			return 0
		;;
	esac
}

machine=$(grep "^Hardware" /proc/cpuinfo | sed 's/Hardware\s*:\s*//')

if write_to_flash; then
	db_progress START 0 3 flash-kernel-installer/progress
else
	db_progress START 0 3 flash-kernel-installer/progress_disk
fi
db_progress INFO flash-kernel-installer/prepare

# Stop fsck from prompting the user for input since most users don't
# have a serial console.
sed -i "s/^FSCKFIX=no$/FSCKFIX=yes/" /target/etc/default/rcS || true

if ! apt-install flash-kernel; then
	error "apt-install flash-kernel failed"
fi

# Set up flash-kernel to run on kernel upgrades.
if ! grep -q flash-kernel /target/etc/kernel-img.conf; then
	echo "postinst_hook = flash-kernel" >> \
		/target/etc/kernel-img.conf
fi

# Temporarily move flash-kernel out of the way so update-initramfs
# won't call flash-kernel; otherwise we'd call it twice.
mv /target/usr/sbin/flash-kernel /target/tmp/flash-kernel.$$

db_progress STEP 1

case "$machine" in
	"Buffalo Linkstation Pro/Live" | "Buffalo/Revogear Kurobox Pro")
		in-target update-initramfs -u || true
		if ! apt-install uboot-mkimage; then
			error "apt-install uboot-mkimage failed"
		fi
	;;
	"D-Link DNS-323")
		in-target update-initramfs -u || true
		if ! apt-install uboot-mkimage; then
			error "apt-install uboot-mkimage failed"
		fi
	;;
	"Freescale MX51 Babbage Board")
		if ! anna-install redboot-tools-udeb; then
			error "anna-install redboot-tools-udeb failed"
		fi
		if ! apt-install redboot-tools; then
			error "apt-install redboot-tools failed"
		fi
		# hardcoded defaults
		fis_dev="/dev/mmcblk0"
		fis_offset_hex="0x40000"
		fis_size_hex="0x1F000"
		# create flash-kernel.conf
		echo "fis_dev=${fis_dev}" > /target/etc/flash-kernel.conf
		echo "fis_offset_hex=${fis_offset_hex}" >> /target/etc/flash-kernel.conf
		echo "fis_size_hex=${fis_size_hex}" >> /target/etc/flash-kernel.conf
		# find fis configuration
		ofst=$(LC_ALL=C fis -d "$fis_dev" -o $fis_offset_hex list | sed -rn "s/^[[:space:]]*RedBoot config: addr = (0x[0-9a-f]{8}), size = 0x[0-9a-f]{8}, entry = 0x[0-9a-f]{8}, length = 0x[0-9a-f]{8}, cksum = 0x[0-9a-f]{8}\$/\1/p")
		if [ -z "$ofst" ]; then
			error "could not find fis configuration on $fis_dev"
		fi
		# required to assemble redboot script
		initrd_names="initrd initramfs"
		for name in $initrd_names; do
			if fis -d "$fis_dev" -o $fis_offset_hex list | grep -q "^[[:space:]]*$name:"; then
		        initrd_name=$name
		    fi
		done
		if [ -z "$initrd_name" ];then
		    error "no fis partition with valid name for initramfs found"
		fi
		kernel_names="vmlinuz kernel"
		for name in $kernel_names; do
			if fis -d "$fis_dev" -o $fis_offset_hex list | grep -q "^[[:space:]]*$name:"; then
		        kernel_name=$name
		    fi
		done
		if [ -z "$kernel_name" ];then
		    error "no fis partition with valid name for kernel found"
		fi
		load_initrd="fis load $initrd_name"
		load_kernel="fis load $kernel_name"
		# find target UUID
		rootfs="$(findfs /)"
		uuid="$(block-attr --uuid "$rootfs")"
		# assemble cmdline
		cmdline="\"root=UUID=$uuid ro quiet splash\""
		script="$load_initrd\\$load_kernel\\exec -r 0x1000000 -s 0x00940000 -c $cmdline\\"
		fconfig -w -s -d "$fis_dev" -o $ofst -n boot_script_data -x "$script"
		in-target update-initramfs -u || true
	;;
	"GLAN Tank")
		in-target update-initramfs -u || true
	;;
	"HP Media Vault mv2120")
		if ! apt-install mv2120-utils; then
			# mv2120-utils includes some initramfs-tools scripts
			# that would be nice to have but which are not
			# essential.
			log "apt-install mv2120-utils failed"
		fi
		in-target update-initramfs -u || true
		if ! apt-install uboot-mkimage; then
			error "apt-install uboot-mkimage failed"
		fi
		# The firmware loads /boot/uImage from the first partition
		# but uImage will be in / if a separate boot partition is
		# used.  In this case, create a /boot/boot -> /boot symlink.
		# Note that a partman check will make sure that /boot (if
		# it exists) or / (if there's no separate /boot) are on the
		# first partition.
		rootfs=$(findfs /)
		bootfs=$(findfs /boot)
		if [ "$rootfs" != "$bootfs" ]; then
			if [ ! -e /target/boot/boot ]; then
				ln -s . /target/boot/boot
			fi
		fi
	;;
	"Linksys NSLU2")
		if ! apt-install ixp4xx-firmware; then
			# not fatal, firmware can be provided other ways
			# and is not always needed
			log "apt-install ixp4xx-firmware failed"
		fi
		# nslu2-utils will call update-initramfs -u to include the
		# firmware and to run the hook from flash-kernel
		if ! apt-install nslu2-utils; then
			error "apt-install nslu2-utils failed"
		fi
		if ! apt-install apex-nslu2; then
			error "apt-install apex-nslu2 failed"
		fi
	;;
	"Marvell DB-MV88F6781-BP Development Board")
		in-target update-initramfs -u || true
		if ! apt-install uboot-mkimage; then
			error "apt-install uboot-mkimage failed"
		fi

		# Add the rootfs to the flash-kernel.conf file
		rootfs=$(findfs /)
		uuid="$(block-attr --uuid "$rootfs")"
		echo "rootfs='root=UUID=$uuid'" > /target/etc/flash-kernel.conf
	;;
	"OMAP3 Beagle Board")
		if ! apt-install uboot-mkimage; then
			error "apt-install uboot-mkimage failed"
		fi
		if ! apt-install uboot-envtools; then
			error "apt-install uboot-envtools failed"
		fi
		rootfs=$(findfs /)
		uuid="$(block-attr --uuid "$rootfs")"
		cmdline="root=UUID=$uuid ro quiet splash vram=12M omapfb.mode=dvi:1280x720MR-16@60 fixrtc"
		bootcmd="nand read 80000000 280000 400000;nand read 81600000 680000 1000000;bootm 80000000 81600000"
		# create a default config for uboot-envtools
		echo "/dev/mtd2 0x0000 0x20000 0x20000" > /target/etc/fw_env.config
		# set proper NAND boot defaults
		in-target fw_setenv bootcmd "${bootcmd}"
		in-target fw_setenv bootargs "${cmdline}"
		in-target fw_setenv bootdelay 3
    ;;
	"Thecus N2100" | "Thecus N4100")
		in-target update-initramfs -u || true
	;;
	"QNAP TS-109/TS-209" | "QNAP TS-409")
		in-target update-initramfs -u || true
		if ! apt-install uboot-mkimage; then
			error "apt-install uboot-mkimage failed"
		fi
	;;
esac

db_progress STEP 1
if write_to_flash; then
	db_progress INFO flash-kernel-installer/flashing
else
	db_progress INFO flash-kernel-installer/generating_image
fi

mv /target/tmp/flash-kernel.$$ /target/usr/sbin/flash-kernel

# We need the udev /dev which has the MTD devices
mount -o bind /dev /target/dev
if ! in-target flash-kernel; then
	umount /target/dev || true
	error "flash-kernel failed"
fi
umount /target/dev || true

db_progress STEP 1
db_progress STOP