Dynamically insert entry into /etc/network/interfaces file for Ubuntu

lib/vagrant/actions/vm/network.rb

@@ -7,7 +7,12 @@ module Vagrant
         end
 
         def after_boot
+          if enable_network?
+            logger.info "Enabling host only network..."
 
+            runner.system.prepare_host_only_network
+            runner.system.enable_host_only_network(runner.env.config.vm.network_options)
+          end
         end
 
         def enable_network?
@@ -17,7 +22,7 @@ module Vagrant
         # Enables and assigns the host only network to the proper
         # adapter on the VM, and saves the adapter.
         def assign_network
-          logger.info "Enabling host only network..."
+          logger.info "Preparing host only network..."
 
           network_options = runner.env.config.vm.network_options
           adapter = runner.vm.network_adapters[network_options[:adapter]]

lib/vagrant/actions/vm/reload.rb

@@ -3,7 +3,7 @@ module Vagrant
     module VM
       class Reload < Base
         def prepare
-          steps = [Customize, ForwardPorts, SharedFolders, Boot]
+          steps = [Customize, ForwardPorts, SharedFolders, Network, Boot]
           steps.unshift(Halt) if @runner.vm.running?
           steps << Provision if !@runner.env.config.vm.provisioner.nil?
 
@@ -14,4 +14,4 @@ module Vagrant
       end
     end
   end
-end
+end

lib/vagrant/actions/vm/shared_folders.rb

@@ -38,6 +38,10 @@ module Vagrant
           end
 
           @runner.reload!
+
+          # Sleep to allow VirtualBox to clean things up. There seems
+          # to be no clean API call to do this.
+          sleep 1
         end
 
         def create_metadata

lib/vagrant/systems/base.rb

@@ -55,6 +55,10 @@ module Vagrant
       #   wants the folder mounted.
       def mount_shared_folder(ssh, name, guestpath); end
 
+      # 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
+
       # Setup the system by adding a new host only network. This
       # method should configure and bring up the interface for the
       # given options.

lib/vagrant/systems/linux.rb

@@ -69,6 +69,26 @@ module Vagrant
         ssh.exec!("sudo rm #{config.vm.rsync_crontab_entry_file}", :error_check => false)
       end
 
+      def prepare_host_only_network
+        # TODO: Verify ubuntu here, otherwise error and tell user to
+        # implement this manually or to use ubuntu.
+
+        # Remove any previous host only network additions to the
+        # interface file.
+        vm.ssh.execute do |ssh|
+          ssh.exec!("sudo su -c \"sed -e '/^#VAGRANT-BEGIN/,/^#VAGRANT-END/ d' /etc/network/interfaces > /etc/network/interfaces\"")
+        end
+      end
+
+      def enable_host_only_network(net_options)
+        entry = TemplateRenderer.render('network_entry', :net_options => net_options)
+        vm.ssh.upload!(StringIO.new(entry), "/tmp/vagrant-network-entry")
+
+        vm.ssh.execute do |ssh|
+          ssh.exec!("sudo su -c 'cat /tmp/vagrant-network-entry >> /etc/network/interfaces'")
+        end
+      end
+
       #-------------------------------------------------------------------
       # "Private" methods which assist above methods
       #-------------------------------------------------------------------

templates/network_entry.erb

@@ -0,0 +1,8 @@
+#VAGRANT-BEGIN
+# The contents below are automatically generated by Vagrant.
+# Please do not modify any of these contents.
+auto eth<%= net_options[:adapter] %>
+iface eth<%= net_options[:adapter] %> inet static
+      address <%= net_options[:ip] %>
+      netmask <%= net_options[:netmask] %>
+#VAGRANT-END

test/vagrant/actions/vm/network_test.rb

@@ -23,6 +23,25 @@ class NetworkTest < Test::Unit::TestCase
     end
   end
 
+  context "after boot" do
+    setup do
+      @action.stubs(:enable_network?).returns(true)
+    end
+
+    should "prepare the host only network, then enable them" do
+      run_seq = sequence("run")
+      @runner.system.expects(:prepare_host_only_network).once.in_sequence(run_seq)
+      @runner.system.expects(:enable_host_only_network).once.in_sequence(run_seq)
+      @action.after_boot
+    end
+
+    should "do nothing if network is not enabled" do
+      @action.stubs(:enable_network?).returns(false)
+      @runner.system.expects(:prepare_host_only_network).never
+      @action.after_boot
+    end
+  end
+
   context "checking if network is enabled" do
     should "return true if the network options are set" do
       @runner.env.config.vm.network("foo")

test/vagrant/actions/vm/reload_test.rb

@@ -7,7 +7,7 @@ class ReloadActionTest < Test::Unit::TestCase
 
   context "sub-actions" do
     setup do
-      @default_order = [Vagrant::Actions::VM::Customize, Vagrant::Actions::VM::ForwardPorts, Vagrant::Actions::VM::SharedFolders, Vagrant::Actions::VM::Boot]
+      @default_order = [Vagrant::Actions::VM::Customize, Vagrant::Actions::VM::ForwardPorts, Vagrant::Actions::VM::SharedFolders, Vagrant::Actions::VM::Network, Vagrant::Actions::VM::Boot]
       @vm.stubs(:running?).returns(false)
     end