+ # umount vboxsf mounts, no retry, just don't stack them :)
+ local mount errors out rc=0
+ show "Unmounting vboxsf file systems"; busy
+ awk '$3 == "vboxsf" {print $2}' /proc/mounts | while read mount; do
+ if ! umount "$mount"; then
+ rc=$?
+ fi
+ done
+ if [ $rc = 0 ]; then
+ ok
+ else
+ fail
+ fi
+
+ # NOTE: rmmod will say module in use if there are remaining mounts