bin/gt in gaptool-client-0.7.4 vs bin/gt in gaptool-client-0.7.5

@@ -10,9 +10,14 @@
 ENV['SSH_AUTH_SOCK'] = ''
 
 OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE unless ENV['GT_SSL_VERIFY_NONE'].nil?
 
 # Make API accessable to client
+%w(GT_USER GT_KEY GT_URL).each do |k|
+  if ENV[k].nil?
+    abort("Missing environment variable #{k}")
+  end
+end
 $api = GTAPI::GaptoolServer.new(ENV['GT_USER'], ENV['GT_KEY'], ENV['GT_URL'], ENV['GT_AWS_ZONE'])
 
 # Run client
 require File.expand_path(File.dirname(__FILE__) + "/../lib/gaptool-client.rb")