Commits on Mar 25, 2021

1. grml-live: fix falldown from c78f58b. …

   While deleting the bind-mount destination of mirror directories is fine
   in theory, we ended up deleting empty base directories as well.
   
   This is obviously bad, so let's avoid removing base directories by:
     - keeping a copy of all base directories (this should be updated
       periodically, but updates to base directories happen so rarely that
       it hardly matters)
     - wrapping the functionality of rmdir -p in a new function that makes
       sure to stop on base directories, no matter whether empty or not.
   
   Since we use that functionality for directories in a chroot (from the
   outside), additional code to handle chroots is necessary.
   
   With that, base directories should now be correctly protected from
   removal.

   

   Ionic committed Mar 25, 2021
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