From c4fd5979a14ebbd37fe0357177f983e5ccfb0cc4 Mon Sep 17 00:00:00 2001
From: "Mark J. Titorenko" <mark.titorenko@alces-software.com>
Date: Thu, 2 Jan 2014 13:54:40 +0000
Subject: Bail out with a useful error message if dependencies for example
 script can't be loaded.

---
 bin/net-dhcp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/bin/net-dhcp b/bin/net-dhcp
index 9dacf29..29f5911 100755
--- a/bin/net-dhcp
+++ b/bin/net-dhcp
@@ -3,10 +3,17 @@
 # 4 de octubre de 2007
 #
 
-require 'dhcp'
-require 'net/dhcp'
-require 'socket'
-require 'pcaplet'
+begin
+  require 'dhcp'
+  require 'net/dhcp'
+  require 'socket'
+  require 'pcaplet'
+rescue LoadError
+  STDERR.puts "Unable to load a required library.  Please ensure you have installed the following gems:"
+  STDERR.puts "  dhcp, ipaddress, ruby-pcap"
+  STDERR.puts "\nError was: #{$!.message}"
+  exit 1
+end
 
 server_thread = Thread.new do
   s = "Packets received by the filter:\n"
-- 
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