rsync - Jul 2014 - [Bug 10748] New: 3.1.0 and 3.1.1 create all dirs on target even with --prune-empty-dirs

https://bugzilla.samba.org/show_bug.cgi?id=10748

           Summary: 3.1.0 and 3.1.1 create all dirs on target even with
                    --prune-empty-dirs
           Product: rsync
           Version: 3.1.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: samba at tlinx.org
         QAContact: rsync-qa at samba.org


I'm doing an rsync from a snapshot to an empty "diffdir"
**minus** the basedir, as in "--compare-dest" in below
args... :

<rsync command>  arglist = qw( --8-bit-output --acls 
 --archive --hard-links --human-readable --no-inc-recursive 
 --one-file-system --prune-empty-dirs --whole-file --xattrs ), 
 "--compare-dest=$base_lvh->fs_mp/.") <snapshotdir>
<diffdir>

Unfortunately, it's creating *ALL* of the dirs on the source,
changed or not.

After the above was run, the "diffdir" contained 560515 dirs,
of which 386220 were empty. Deleting them freed up almost
300MB on a 600MB "diff".  *ouch*.

This breaks (I'm working on a hack-around) my snapshot
script as it does a "du" of the source and expects
that the copied files should fit in a sized-to-fit
volume that is 125% of the original sources (but doesn't
when a bunch are dirs).

Anyway... only 31% of the directories it copied were
needed -- 69% of the directories were empty.  

What happened?  It didn't used to create such an excess...

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https://bugzilla.samba.org/show_bug.cgi?id=10748

--- Comment #1 from walter <wa at wlkl.ch> ---
5 years later, I detect the same problem - which is critical for me.

why has nothing happened on that bug?

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https://bugzilla.samba.org/show_bug.cgi?id=10748

--- Comment #2 from Kevin Korb <rsync at sanitarium.net> ---
--prune-empty-dirs only affects the file list that rsync is working from.  That
means it handles dirs that are either really empty on the source or anything
that has been emptied via --exclude or --filter.  Options that modify the way
rsync stores stuff but not the list of stuff it is processing are not affected
by --prune-empty-dirs.  That would apply to the 3 --*-dest options.  As long as
there are files on the source that haven't been excluded or filtered they
are
still in the listing that rsync is processing so the directory is not empty.

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