From 1b64520816d91bd3252ae41b566a3eda15c946ba Mon Sep 17 00:00:00 2001
From: Steve Kemp <steve@steve.org.uk>
Date: Fri, 23 Nov 2012 13:49:07 +0000
Subject:   Ensure we have a sane argument to our constructor.

---
 lib/custodian/util/ping.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/custodian/util/ping.rb b/lib/custodian/util/ping.rb
index 86fa2ab..9abc746 100644
--- a/lib/custodian/util/ping.rb
+++ b/lib/custodian/util/ping.rb
@@ -25,6 +25,10 @@ module Custodian
       # Save the hostname away, resolve it if possible.
       #
       def initialize( hostname )
+
+        raise ArgumentError, "Hostname must not be nil" if ( hostname.nil? )
+        raise ArgumentError, "Hostname must be a String" unless  hostname.kind_of?( String )
+
         @hostname = hostname
         @resolved = Custodian::Util::DNS.hostname_to_ip( hostname )
       end
-- 
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