Fix for recognizing serial numbers

rootfs/etc/s6-overlay/scripts/01-vdlm2dec

@@ -59,22 +59,7 @@ if [[ -z "${SERIAL}" ]]; then
 	exit 1
 fi
 
-RTL_TEST_OUTPUT=$(timeout 1s rtl_test -d 0 2>&1 | grep -P '^\s+\d+:\s+\S+?,\s+\S+?,\s+SN:\s+\S+?\s*$' || true)
-
-IFS=$'\n'
-for RTL_TEST_OUTPUT_LINE in $RTL_TEST_OUTPUT; do
-	# Unset variables in case any regexes fail
-	unset RTL_DEVICE_ID RTL_DEVICE_MAKE RTL_DEVICE_MODEL RTL_DEVICE_SERIAL
-
-	# Pull variables from output via regex
-	RTL_DEVICE_NUMBER=$(echo "$RTL_TEST_OUTPUT_LINE" | grep -oP '^\s+\K\d+(?=:\s+\S+?,\s+\S+?,\s+SN:\s+\S+?\s*$)')
-	RTL_DEVICE_SERIAL=$(echo "$RTL_TEST_OUTPUT_LINE" | grep -oP '^\s+\d+:\s+\S+?,\s+\S+?,\s+SN:\s+\K\S+?(?=\s*$)')
-
-	# See if we've found the device we're looking for
-	if [[ -n "$SERIAL" && "$SERIAL" == "$RTL_DEVICE_SERIAL" ]]; then
-		OUTPUT_DEVICE_ID="$RTL_DEVICE_NUMBER"
-	fi
-done
+OUTPUT_DEVICE_ID="$(timeout 1s rtl_test -d $((RANDOM+99)) 2>&1 | grep -P -e "SN: $SERIAL" | sed -n 's/^\s*\([0-9]\+\):.*$/\1/p')"
 
 if [[ -z "${OUTPUT_DEVICE_ID}" ]]; then
 	echo "Could not find device ID for serial '$SERIAL'"