[rdiff-backup-users] Delete Enough To Finish

[Bob Fischer]

I saw the Delete Enough To Finish page listed on the Wiki.  It seems
this feature could be implemented as follows.

Rdiff-backup will work and work, filling up the hard drive. 
Rdiff-backup will catch not-enough-space errors using a try...catch type
block.  When such an error occurs, it will do the following:
 1. Delete ONE increment, using the already-build increment deletion
feature.
 2. Try again
 3. If still not enough space, delete another increment, etc...

The increment deletion would be configured to not delete too much; for
example, to leave at least two increments, or at least 1 week, etc.  If
there is not enough space and no more increments can be deleted, then
rdiff-backup can declare the hard drive to be full.

Is there any reason this could not be implemented?

-- Bob