It advertises different boxes with appropriate constraints to the network and permits the creation of persitent boxes by storing them on files. The implementation is suitable for usage on any conventional file system.
Permissions and other metadata are mapped to those of the native file system employed.
Box information for boxes using files created by means of make(2) is kept on auxiliary files.
/b/fs/*/lib as /lib.
/b/fs/usr as /usr.
/b/fs as /.
The implementation does not handle link(2) requests.