Darwin guest: mount_vmware_shared_folder cap for use with vmware_fusion provider

- It's not clear whether it's possible to mount individual shares
  using 'mount -t vmhgfs', as the vagrant-vmware-fusion provider now does
  for Linux guests. Any mount from '.host', even if not a valid share
  name, succeeds and mounts _all_ shares in their respective directories
  at the root of the mountpoint. Instead, we symlink each directory from
  its place in '/Volumes/VMware Shared Folders'

plugins/guests/darwin/cap/mount_vmware_shared_folder.rb

@@ -0,0 +1,36 @@
+module VagrantPlugins
+  module GuestDarwin
+    module Cap
+      class MountVmwareSharedFolder
+
+        # we seem to be unable to ask 'mount -t vmhgfs' to mount the roots
+        # of specific shares, so instead we symlink from what is already
+        # mounted by the guest tools 
+        # (ie. the behaviour of the VMware_fusion provider prior to 0.8.x)
+
+        def self.mount_vmware_shared_folder(machine, name, guestpath, options)
+          machine.communicate.tap do |comm|
+            # clear prior symlink
+            if comm.test("sudo test -L \"#{guestpath}\"")
+              comm.sudo("rm \"#{guestpath}\"")
+            end
+
+            # clear prior directory if exists
+            if comm.test("sudo test -d \"#{guestpath}\"")
+              comm.sudo("rm -Rf \"#{guestpath}\"")
+            end
+
+            # create intermediate directories if needed
+            intermediate_dir = File.dirname(guestpath)
+            if !comm.test("sudo test -d \"#{intermediate_dir}\"")
+              comm.sudo("mkdir -p \"#{intermediate_dir}\"")
+            end
+
+            # finally make the symlink
+            comm.sudo("ln -s \"/Volumes/VMware Shared Folders/#{name}\" \"#{guestpath}\"")
+          end
+        end
+      end
+    end
+  end
+end

plugins/guests/darwin/plugin.rb

@@ -31,6 +31,11 @@ module VagrantPlugins
         Cap::MountNFSFolder
       end
 
+      guest_capability("darwin", "mount_vmware_shared_folder") do
+        require_relative "cap/mount_vmware_shared_folder"
+        Cap::MountVmwareSharedFolder
+      end
+
       guest_capability("darwin", "shell_expand_guest_path") do
         require_relative "cap/shell_expand_guest_path"
         Cap::ShellExpandGuestPath