From 24bd7151e24d88e3457fedb32f784c696c839c68 Mon Sep 17 00:00:00 2001
From: Alex Bligh <alex@alex.org.uk>
Date: Fri, 10 Apr 2015 14:59:57 +0100
Subject: [PATCH] Error if neither -iface or -name is specified

This prevents a nil pointer dereference if (e.g.) weaver is
invoked with no arguments.

Signed-off-by: Alex Bligh <alex@alex.org.uk>
---
 weaver/main.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/weaver/main.go b/weaver/main.go
index eb8fc476..c1a26221 100644
--- a/weaver/main.go
+++ b/weaver/main.go
@@ -92,6 +92,9 @@ func main() {
 	}
 
 	if routerName == "" {
+		if iface == nil {
+			log.Fatal("Either an interface must be specified with -iface or a name with -name")
+		}
 		routerName = iface.HardwareAddr.String()
 	}