#! /bin/sh -e
# Make sure that /etc/network/devnames is up to date, using sysfs. In
# hotplug land, we may not get a chance to update it otherwise.

if [ ! -d /sys/class/net ] || ! type lspci >/dev/null 2>&1; then
	exit
fi

for dev in $(grep : /proc/net/dev | sort | cut -d: -f1); do
	if grep "^$dev:" /etc/network/devnames >/dev/null 2>&1; then
		continue
	fi
	if [ ! -f "/sys/class/net/$dev/device/vendor" ] || \
	   [ ! -f "/sys/class/net/$dev/device/device" ]; then
		continue
	fi

	vendor="$(sed 's/^0x//' "/sys/class/net/$dev/device/vendor")"
	device="$(sed 's/^0x//' "/sys/class/net/$dev/device/device")"
	# 'tail -n 1' because for some reason lspci outputs two
	# Device: lines.
	vendorname="$(lspci -d "$vendor:$device" -m -v | grep ^Vendor: | tail -n 1 | sed 's/^Vendor:[[:space:]]*//; s/,/\\,/g')"
	devicename="$(lspci -d "$vendor:$device" -m -v | grep ^Device: | tail -n 1 | sed 's/^Device:[[:space:]]*//; s/,/\\,/g')"
	if [ "$vendorname" ] || [ "$devicename" ]; then
		echo "$dev:$vendorname $devicename" >> /etc/network/devnames
	fi
done
