If there is only one bridgable interface, just use that [GH-655]

CHANGELOG.md

@@ -13,6 +13,8 @@
     the behavior seems different/wrong.
   - Give a nice error if `:vagrant` is used as a JSON key, since Vagrant
     uses this. [GH-661]
+  - If there is only one bridgable interface, use that without asking
+    the user. [GH-655]
 
 ## 0.9.1 (January 18, 2012)
 

lib/vagrant/action/vm/network.rb

@@ -314,7 +314,13 @@ module Vagrant
         def bridged_adapter(config)
           bridgedifs = @env[:vm].driver.read_bridged_interfaces
 
-          # Output all the interfaces that are available as choices
+          chosen_bridge = nil
+          if bridgedifs.length == 1
+            # One bridgable interface? Just use it.
+            chosen_bridge = bridgedifs[0][:name]
+          else
+            # More than one bridgable interface requires a user decision, so
+            # show options to choose from.
             @env[:ui].info I18n.t("vagrant.actions.vm.bridged_networking.available",
                                   :prefix => false)
             bridgedifs.each_index do |index|
@@ -332,11 +338,16 @@ module Vagrant
               choice = choice.to_i
             end
 
+            chosen_bridge = bridgedifs[choice - 1][:name]
+          end
+
+          @logger.info("Bridging adapter #{config[:adapter]} to #{bridge}")
+
           # Given the choice we can now define the adapter we're using
           return {
             :adapter     => config[:adapter],
             :type        => :bridged,
-            :bridge      => bridgedifs[choice - 1][:name],
+            :bridge      => chosen_bridge,
             :mac_address => config[:mac]
           }
         end