From e92c5371ad121e65fefd2a5ed3c1830c5b2a8ca3 Mon Sep 17 00:00:00 2001
From: Christopher Peplin <cpeplin@ford.com>
Date: Mon, 2 Apr 2012 11:48:56 -0400
Subject: [PATCH] Error out if no Arduino TTY device is detected when
 uploading.

---
 arduino-mk/Arduino.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arduino-mk/Arduino.mk b/arduino-mk/Arduino.mk
index 2d39095..fdfa93a 100644
--- a/arduino-mk/Arduino.mk
+++ b/arduino-mk/Arduino.mk
@@ -478,6 +478,9 @@ raw_upload:	$(TARGET_HEX)
 # stdin/out appears to work but generates a spurious error on MacOS at
 # least. Perhaps it would be better to just do it in perl ?
 reset:		
+		@if [ -z "$(ARD_PORT)" ]; then \
+			echo "No Arduino-compatible TTY device found -- exiting"; exit 2; \
+			fi
 		for STTYF in 'stty -F' 'stty --file' 'stty -f' 'stty <' ; \
 		  do $$STTYF /dev/tty >/dev/null 2>/dev/null && break ; \
 		done ;\