Better debugging on searching for capabilities

lib/vagrant/action/builtin/nfs.rb

@@ -79,7 +79,7 @@ module Vagrant
 
             # Mount them!
             env[:machine].guest.capability(
-              :mount_nfs, env[:nfs_host_ip], mount_folders)
+              :mount_nfs_folder, env[:nfs_host_ip], mount_folders)
           end
         end
 

lib/vagrant/guest.rb

@@ -146,9 +146,15 @@ module Vagrant
     # @param [Symbol] cap_name
     # @return [Module]
     def capability_module(cap_name)
+      @logger.debug("Searching for cap: #{cap_name}")
       @chain.each do |guest_name, guest|
+        @logger.debug("Checking in: #{guest_name}")
         caps = @capabilities[guest_name]
-        return caps[cap_name] if caps && caps.has_key?(cap_name)
+
+        if caps && caps.has_key?(cap_name)
+          @logger.debug("Found cap: #{cap_name} in #{guest_name}")
+          return caps[cap_name]
+        end
       end
 
       nil

plugins/guests/linux/cap/mount_nfs.rb

@@ -1,8 +1,12 @@
+require "vagrant/util/retryable"
+
 module VagrantPlugins
   module GuestLinux
     module Cap
       class MountNFS
-        def self.mount_nfs(machine, ip, folders)
+        extend Vagrant::Util::Retryable
+
+        def self.mount_nfs_folder(machine, ip, folders)
           folders.each do |name, opts|
             # Expand the guest path so we can handle things like "~/vagrant"
             expanded_guest_path = machine.guest.capability(