udev: Fix renaming bridged interfaces

Since using random interface names is always trouble, we will order all
slave interfaces and number them in order as they appear in the SLAVES
variable.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

config/udev/network-hotplug-rename

@@ -58,18 +58,25 @@ for zone in ${ZONES}; do
 	address="${zone}_MACADDR"
 	device="${zone}_DEV"
 	mode="${zone}_MODE"
+	slaves="${zone}_SLAVES"
 
-	# Skip if address or device is unset
-	[ -n "${!address}" -a -n "${!device}" ] || continue
-
-	# Compare MAC addresses
-	[ "${ADDRESS}" = "${!address,,}" ] || continue
+	# Return DEV when the address matches
+	if [ "${!address,,}" = "${ADDRESS,,}" ]; then
+		echo "${!device}"
+		exit 0
+	fi
 
 	# If a matching interface has been found we will
 	# print the name to which udev will rename it.
 	case "${!mode}" in
 		bridge)
-			echo "${!device%0}phys0"
+			counter=0
+			for slave in ${!slaves}; do
+				if [ "${slave,,}" = "${ADDRESS,,}" ]; then
+					echo "${!device}p${counter}"
+				fi
+				(( counter += 1 ))
+			done
 			;;
 
 		macvtap)
@@ -81,13 +88,7 @@ for zone in ${ZONES}; do
 				echo "${!device%0}phys0"
 			fi
 			;;
-
-		*)
-			echo "${!device}"
-			;;
 	esac
-
-	exit 0
 done
 
 # If we get here we have not found a matching device,