synced_folders/smb: test for admin privileges

plugins/synced_folders/smb/errors.rb

@@ -21,6 +21,10 @@ module VagrantPlugins
       class WindowsHostRequired < SMBError
         error_key(:windows_host_required)
       end
+
+      class WindowsAdminRequired < SMBError
+        error_key(:windows_admin_required)
+      end
     end
   end
 end

plugins/synced_folders/smb/synced_folder.rb

@@ -20,6 +20,11 @@ module VagrantPlugins
           return false
         end
 
+        if !Vagrant::Util::Platform.windows_admin?
+          raise Errors::WindowsAdminRequired if raise_error
+          return false
+        end
+
         true
       end
 

templates/locales/synced_folder_smb.yml

@@ -37,6 +37,11 @@ en:
         Error:
 
         %{stderr}
+      windows_admin_required: |-
+        SMB shared folders require running Vagrant with administrative
+        privileges. This is a limitation of Windows, since creating new
+        network shares requires admin privileges. Please try again in a
+        console with proper permissions or use another synced folder type.
       windows_host_required: |-
         SMB shared folders are only available when Vagrant is running
         on Windows. The guest machine can be running non-Windows. Please use