Access IP address using VM provider API, the same way as `vagrant ssh…

…` does.

Calling a code within guest VM can give different results, i.e. issues with `docker0` interface registered as a first network adapter.

lib/command.rb

@@ -7,7 +7,7 @@ def self.synopsis
 
       def execute
         with_target_vms(nil, {:single_target=>true}) do |machine|
-          ip = machine.guest.capability(:read_ip_address)
+          ip = machine.provider.capability(:public_address)
           message = ENV['TEAMCITY_VERSION'] ? "##teamcity[setParameter name='env.VAGRANT_GUESTIP' value='#{ip}']" : ip
           @env.ui.info(message)
         end

vagrant-guestip.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = 'vagrant-guestip'
-  spec.version       = '0.2'
+  spec.version       = '0.3.pre1'
   spec.authors       = ['Michael Kuzmin']
   spec.email         = ['[email protected]']
   spec.summary       = 'Vagrant plugin for obtaining IP address of a guest machine'