_cleanup()
{
cd /
- umount $SCRATCH_MNT 2>/dev/null
+ _scratch_unmount 2>/dev/null
umount $imgs.loop 2>/dev/null
[ -d $imgs.loop ] && rmdir $imgs.loop
umount $imgs.source_dir 2>/dev/null
echo
echo === populating scratch device
_populate_scratch
-umount $SCRATCH_MNT 2>/dev/null
+_scratch_unmount 2>/dev/null
echo
echo === copying scratch device to single target