+# cache .deb packages on the host via a mount trick
+if config['apt_package_cache']:
+ aptcachedir = cachedir + '/apt/archives'
+ vagrantfile += """
+ config.vm.synced_folder "{0}", "/var/cache/apt/archives",
+ owner: 'root', group: 'root', create: true
+""".format(aptcachedir)
+