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#!/bin/sh -efu

iftab='/etc/iftab'
rules='/etc/udev/rules.d/70-persistent-net.rules'
udevadm=/sbin/udevadm

[ -x "$udevadm" ] &&
iftab_lines="$(grep -cs '^[[:space:]]*[^[:space:]#]' "$iftab")" ||
	exit 0

>>"$rules"
rules_old_lines="$(grep -cs '^SUBSYSTEM==' "$rules")" ||:

sed -n 's/^[[:space:]]*\([^[:space:]#*]\+\)[[:space:]]\+\(mac\|SYSFS{address}\)[[:space:]]\+\(\([[:xdigit:]][[:xdigit:]]:\)\{5\}[[:xdigit:]][[:xdigit:]]\)\([[:space:]].*\|$\)/\1 \3/p' -- "$iftab" |
sort -u |
while read -r iface mac; do
	touch -d '1 second ago' "$rules"
	t="$(stat -c %Y "$rules")"
	$udevadm trigger --subsystem-match=net --attr-match=address="$mac"
	for i in `seq 1 10`; do
		[ "$t" = "$(stat -c %Y "$rules")" ] || break
		sleep 0.05
	done
	sed -i "/ATTR{address}==\"$mac\"/s/NAME=\"[^\"]\+\"/NAME=\"$iface\"/" "$rules"
done

rules_new_lines="$(grep -cs '^SUBSYSTEM==' "$rules")" ||:
rules_added="$(($rules_new_lines-$rules_old_lines))"

rules_added_suff=
[ $rules_added = 1 ] || rules_added_suff=s
iftab_lines_suff=
[ $iftab_lines = 1 ] || iftab_lines_suff=s

echo >&2 "Added $rules_added new rule$rules_added_suff to $rules based on $iftab_lines line$iftab_lines_suff from $iftab"
[ "$rules_added" = "$iftab_lines" ] ||
	echo >&2 "WARNING: Automatic $iftab -> $rules conversion failed"