mitchellh/vagrant — pull request #1801 by davegudge (2013-06-06 11:12:48+00:00)
Title: Defining the group of a shared folder

*Symtom*: The group ID for groups that are not backed by a user account (e.g. admin) cannot be obtained from the id command.

*Consequence*: The shared folder group can only be set to a group where by a user account of the same name exists.

*Solution*: Correcting the method to define the group ID by looking up the group ID via the group name.