core: Implement support for built in synced folders and add required logic for NFS

lib/vagrant-lxc/action.rb

@@ -15,9 +15,10 @@ require 'vagrant-lxc/action/forward_ports'
 require 'vagrant-lxc/action/handle_box_metadata'
 require 'vagrant-lxc/action/is_running'
 require 'vagrant-lxc/action/message'
+require 'vagrant-lxc/action/prepare_nfs_settings'
+require 'vagrant-lxc/action/prepare_nfs_valid_ids'
 require 'vagrant-lxc/action/remove_temporary_files'
 require 'vagrant-lxc/action/setup_package_files'
-require 'vagrant-lxc/action/share_folders'
 require 'vagrant-lxc/action/warn_networks'
 
 unless Vagrant::Backports.vagrant_1_3_or_later?
@@ -59,7 +60,15 @@ module Vagrant
           b.use Builtin::Provision
           b.use Builtin::EnvSet, :port_collision_repair => true
           b.use Builtin::HandleForwardedPortCollisions
+          if Vagrant::Backports.vagrant_1_4_or_later?
+            b.use PrepareNFSValidIds
+            b.use Builtin::SyncedFolderCleanup
+            b.use Builtin::SyncedFolders
+            b.use PrepareNFSSettings
+          else
+            require 'vagrant-lxc/action/share_folders'
             b.use ShareFolders
+          end
           b.use Builtin::SetHostname
           b.use WarnNetworks
           b.use ForwardPorts

lib/vagrant-lxc/action/prepare_nfs_settings.rb

@@ -0,0 +1,64 @@
+module Vagrant
+  module LXC
+    module Action
+      class PrepareNFSSettings
+        include Vagrant::Util::Retryable
+
+        def initialize(app, env)
+          @app = app
+          @logger = Log4r::Logger.new("vagrant::action::vm::nfs")
+        end
+
+        def call(env)
+          @machine = env[:machine]
+
+          @app.call(env)
+
+          # if using_nfs? # TODO: && !privileged_container?
+          #   raise Errors::NfsWithoutPrivilegedError
+          # end
+
+          if using_nfs?
+            @logger.info("Using NFS, preparing NFS settings by reading host IP and machine IP")
+            add_ips_to_env!(env)
+          end
+        end
+
+        # We're using NFS if we have any synced folder with NFS configured. If
+        # we are not using NFS we don't need to do the extra work to
+        # populate these fields in the environment.
+        def using_nfs?
+          @machine.config.vm.synced_folders.any? { |_, opts| opts[:type] == :nfs }
+        end
+
+        # TODO:
+        # def privileged_container?
+        #   @machine.provider.driver.privileged?(@machine.id)
+        # end
+
+        # Extracts the proper host and guest IPs for NFS mounts and stores them
+        # in the environment for the SyncedFolder action to use them in
+        # mounting.
+        #
+        # The ! indicates that this method modifies its argument.
+        def add_ips_to_env!(env)
+          provider = @machine.provider
+
+          host_ip    = read_host_ip
+          machine_ip = provider.ssh_info[:host]
+
+          raise Vagrant::Errors::NFSNoHostonlyNetwork if !host_ip || !machine_ip
+
+          env[:nfs_host_ip]    = host_ip
+          env[:nfs_machine_ip] = machine_ip
+        end
+
+        def read_host_ip
+          @machine.communicate.execute 'echo $SSH_CLIENT' do |buffer, output|
+            return output.chomp.split(' ')[0] if buffer == :stdout
+          end
+        end
+      end
+    end
+  end
+end

lib/vagrant-lxc/action/prepare_nfs_valid_ids.rb

@@ -0,0 +1,19 @@
+module Vagrant
+  module LXC
+    module Action
+      class PrepareNFSValidIds
+        def initialize(app, env)
+          @app = app
+          @logger = Log4r::Logger.new("vagrant::action::vm::nfs")
+        end
+
+        def call(env)
+          machine = env[:machine]
+          env[:nfs_valid_ids] = machine.provider.driver.all_containers
+
+          @app.call(env)
+        end
+      end
+    end
+  end
+end

lib/vagrant-lxc/driver.rb

@@ -31,6 +31,10 @@ module Vagrant
         raise ContainerNotFound if @container_name && ! @cli.list.include?(@container_name)
       end
 
+      def all_containers
+        @cli.list
+      end
+
       def base_path
         Pathname.new("#{CONTAINERS_PATH}/#{@container_name}")
       end
@@ -68,10 +72,14 @@ module Vagrant
             end
           end
 
-          @customizations << ['mount.entry', "#{folder[:hostpath]} #{guestpath} none bind 0 0"]
+          share_folder(folder[:hostpath], guestpath)
         end
       end
 
+      def share_folder(host_path, guest_path)
+        @customizations << ['mount.entry', "#{host_path} #{guest_path} none bind 0 0"]
+      end
+
       def start(customizations)
         @logger.info('Starting container...')