core: Introduce a synced folder plugin for vagrant 1.4+

lib/vagrant-backports/utils.rb

@@ -5,6 +5,10 @@ module Vagrant
         Gem::Version.new(Vagrant::VERSION) >= Gem::Version.new('1.3.0')
       end
 
+      def vagrant_1_4_or_later?
+        Gem::Version.new(Vagrant::VERSION) >= Gem::Version.new('1.4.0')
+      end
+
       def vagrant_1_5_or_later?
         Gem::Version.new(Vagrant::VERSION) >= Gem::Version.new('1.5.0')
       end

lib/vagrant-lxc/plugin.rb

@@ -23,6 +23,13 @@ module Vagrant
         require File.expand_path("../config", __FILE__)
         Config
       end
+
+      if Vagrant::Backports.vagrant_1_4_or_later?
+        synced_folder(:lxc) do
+          require File.expand_path("../synced_folder", __FILE__)
+          SyncedFolder
+        end
+      end
     end
   end
 end

lib/vagrant-lxc/synced_folder.rb

@@ -0,0 +1,37 @@
+module Vagrant
+  module LXC
+    class SyncedFolder < Vagrant.plugin("2", :synced_folder)
+      def usable?(machine)
+        # These synced folders only work if the provider is LXC
+        machine.provider_name == :lxc
+      end
+
+      def prepare(machine, folders, _opts)
+        machine.ui.output(I18n.t("vagrant.actions.vm.share_folders.mounting"))
+
+        folders.each do |id, data|
+          host_path  = Pathname.new(File.expand_path(data[:hostpath], machine.env.root_path))
+          guest_path = data[:guestpath]
+
+          if !host_path.directory? && data[:create]
+            # Host path doesn't exist, so let's create it.
+            @logger.debug("Host path doesn't exist, creating: #{host_path}")
+
+            begin
+              host_path.mkpath
+            rescue Errno::EACCES
+              raise Vagrant::Errors::SharedFolderCreateFailed,
+                :path => hostpath.to_s
+            end
+          end
+
+          machine.provider.driver.share_folder(host_path, guest_path)
+          # Guest path specified, so mount the folder to specified point
+          machine.ui.detail(I18n.t("vagrant.actions.vm.share_folders.mounting_entry",
+                                guestpath: data[:guestpath],
+                                hostpath:  data[:hostpath]))
+        end
+      end
+    end
+  end
+end