Raise an error message if host only networking is not supported

lib/vagrant/systems/base.rb

@@ -15,6 +15,10 @@ module Vagrant
     # required by systems can and will change at any time. Any
     # changes will be noted on release notes.**
     class Base
+      class BaseError < Errors::VagrantError
+        error_namespace("vagrant.systems.base")
+      end
+
       include Vagrant::Util
 
       # The VM which this system is tied to.
@@ -64,7 +68,9 @@ module Vagrant
 
       # Prepares the system for host only networks. This is called
       # once prior to any `enable_host_only_network` calls.
-      def prepare_host_only_network; end
+      def prepare_host_only_network
+        raise BaseError, :_key => :unsupported_host_only
+      end
 
       # Setup the system by adding a new host only network. This
       # method should configure and bring up the interface for the

templates/locales/en.yml

@@ -460,6 +460,16 @@ en:
         running_puppetd: "Running Puppet agent..."
 
     systems:
+      base:
+        unsupported_host_only: |-
+          Host only networking is very distro-specific. Vagrant has support for many
+          distros built-in: Debian, Ubuntu, Gentoo, and RedHat. The distro of your VM
+          couldn't be detected, or isn't supported for host only networking.
+
+          Most of the time this is simply due to the fact that no one has contributed
+          back the SSH commands necessary to set this up. Please report a bug and this
+          will be fixed for your distro.
+
       linux:
         attempting_halt: "Attempting graceful shutdown of linux..."
         mount_fail: "Failed to mount shared folders. `vboxsf` was not available."
@@ -469,5 +479,6 @@ en:
           that the NFS client software is properly installed, and consult any resources
           specific to the linux distro you're using for more information on how to
           do this.
+
       solaris:
         attempting_halt: "Attempting graceful shutdown of solaris..."

test/vagrant/systems/base_test.rb

@@ -0,0 +1,18 @@
+require "test_helper"
+
+class BaseSystemTest < Test::Unit::TestCase
+  setup do
+    @klass = Vagrant::Systems::Base
+
+    @vm = mock("vm")
+    @instance = @klass.new(@vm)
+  end
+
+  should "provide access to the VM" do
+    assert_equal @vm, @instance.vm
+  end
+
+  should "error on preparing host only network" do
+    assert_raises(@klass::BaseError) { @instance.prepare_host_only_network }
+  end
+end