[ ! -e /etc/fw_env.config ] && exit 0

BOARD_CFG=/etc/board.json
[ ! -e "$BOARD_CFG" ] && exit 0

. /lib/functions/system.sh
. /lib/upgrade/common.sh
. /usr/share/libubox/jshn.sh

[ "$(rootfs_type)" = "tmpfs" ] && exit 0

# Some devices make it hard or impossible to acquire a usable ethaddr / MAC address
# of the device. Some store it in weird places, some ship with only the common
# Realtek dummy ethaddr, and some are outright broken. Often the MAC address
# isn't printed on the case label either.
#
# For these devices, we generate a random ethaddr in /etc/board.d/02_network,
# which is saved in /etc/board.json.
#
# Here we take this random ethaddr and store it in the U-Boot environment,
# so that it survives sysupgrades and factory resets.

store_board_ethaddr() {
	local board_ethaddr
	json_init
	json_load_file "$BOARD_CFG"
	json_select network_device
	json_select eth0
	json_get_var board_ethaddr macaddr
	json_cleanup
	[ -n "$board_ethaddr" ] && fw_setenv ethaddr "$board_ethaddr"
}

case "$(board_name)" in
# F1100W-4SX-4XGT and its variants ship with the dummy ethaddr in the u-boot
# environment, and the real ethaddr stored in RUNTIME/RUNTIME2 JFFS2 partitions,
# which would be annoying to deal with. Also ethaddr isn't printed on the case.
#
# F5800W-12S+ same as F1100W, except the MAC address ends with :10, not :00.
#
# TL-ST1008F v2 ships with the dummy ethaddr because it's sold as unmanaged.
#
# We store the random ethaddr if the currently stored ethaddr is empty or dummy.
hasivo,f1100w-4sx-4xgt|\
hasivo,f1100w-4sx-4xgt-512mb|\
hasivo,f5800w-12s-plus|\
hasivo,s1300wp-8xgt-4s-plus|\
tplink,tl-st1008f-v2)
	env_ethaddr=$(macaddr_canonicalize "$(fw_printenv -n ethaddr 2>/dev/null)")
	ethaddr_prefix=$(echo "$env_ethaddr" | cut -d: -f1-5)

	if [ -z "$env_ethaddr" ] || [ "$ethaddr_prefix" = "00:e0:4c:00:00" ]; then
		store_board_ethaddr
	fi
	;;
# This device ships with an empty environment (invalid CRC). If it is still in
# that state, we don't want to modify it, because that would write the defaults
# of the userspace U-Boot tools (which differ from the ones in the bootloader).
# Thus, we don't do anything here if the ethaddr variable is empty.
zyxel,xgs1010-12-a1|\
zyxel,xgs1010-12-b1)
	env_ethaddr=$(macaddr_canonicalize "$(fw_printenv -n ethaddr 2>/dev/null)")

	if [ "$env_ethaddr" = "00:e0:4c:00:00:00" ]; then
		store_board_ethaddr
	fi
	;;
esac

exit 0
