Halt works with new machine.

This required some modifications to the linux guest implementation. And
the other guests will have to be modified as well. This is because
`channel` is now `communicate`.

lib/vagrant/plugin/v1/communicator.rb

@@ -83,6 +83,15 @@ module Vagrant
         # @see #execute
         def sudo(command, opts=nil)
         end
+
+        # Executes a command and returns true if the command succeeded,
+        # and false otherwise. By default, this executes as a normal user,
+        # and it is up to the communicator implementation if they expose an
+        # option for running tests as an administrator.
+        #
+        # @see #execute
+        def test(command, opts=nil)
+        end
       end
     end
   end

plugins/communicators/ssh/communicator.rb

@@ -85,6 +85,11 @@ module VagrantPlugins
         end
       end
 
+      def test(command, opts=nil)
+        opts = { :error_check => false }.merge(opts || {})
+        execute(command, opts) == 0
+      end
+
       def upload(from, to)
         @logger.debug("Uploading: #{from} to #{to}")
 

plugins/guests/linux/guest.rb

@@ -16,23 +16,25 @@ module VagrantPlugins
       end
 
       def distro_dispatch
-        if @vm.channel.test("cat /etc/debian_version")
-          return :debian if @vm.channel.test("cat /proc/version | grep 'Debian'")
-          return :ubuntu if @vm.channel.test("cat /proc/version | grep 'Ubuntu'")
-        end
+        @vm.communicate.tap do |comm|
+          if comm.test("cat /etc/debian_version") == 0
+            return :debian if comm.test("cat /proc/version | grep 'Debian'") == 0
+            return :ubuntu if comm.test("cat /proc/version | grep 'Ubuntu'") == 0
+          end
 
-        return :gentoo if @vm.channel.test("cat /etc/gentoo-release")
-        return :fedora if @vm.channel.test("grep 'Fedora release 16' /etc/redhat-release")
-        return :redhat if @vm.channel.test("cat /etc/redhat-release")
-        return :suse if @vm.channel.test("cat /etc/SuSE-release")
-        return :arch if @vm.channel.test("cat /etc/arch-release")
+          return :gentoo if comm.test("cat /etc/gentoo-release") == 0
+          return :fedora if comm.test("grep 'Fedora release 16' /etc/redhat-release") == 0
+          return :redhat if comm.test("cat /etc/redhat-release") == 0
+          return :suse if comm.test("cat /etc/SuSE-release") == 0
+          return :arch if comm.test("cat /etc/arch-release") == 0
+        end
 
         # Can't detect the distro, assume vanilla linux
         nil
       end
 
       def halt
-        @vm.channel.sudo("shutdown -h now")
+        @vm.communicate.sudo("shutdown -h now")
 
         # Wait until the VM's state is actually powered off. If this doesn't
         # occur within a reasonable amount of time (15 seconds by default),

plugins/providers/virtualbox/action/halt.rb

@@ -17,9 +17,9 @@ module VagrantPlugins
             end
 
             # If we're not powered off now, then force it
-            if env[:machine].state != :poweroff
+            if env[:machine].provider.state != :poweroff
               env[:ui].info I18n.t("vagrant.actions.vm.halt.force")
-              env[:machine].driver.halt
+              env[:machine].provider.halt
             end
 
             # Sleep for a second to verify that the VM properly