"DiffDirException: Bad tarinfo name" on diff. backup

[Moritz Maisel]

After running for weeks without problems, differntial backup now fails reproducible with the following traceback (also included the last 5 lines of log-data):

---->8----*snip*----
tarfile: Bad Checksum
Removing still remembered temporary file /tmp/duplicity-ZDESlF-tempdir/mkstemp-UP21kB-1
Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1239, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1232, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1214, in main
    incremental_backup(sig_chain)
  File "/usr/bin/duplicity", line 478, in incremental_backup
    bytes_written = dummy_backup(tarblock_iter)
  File "/usr/bin/duplicity", line 160, in dummy_backup
    while tarblock_iter.next():
  File "/usr/lib/python2.6/dist-packages/duplicity/diffdir.py", line 505, in next
    result = self.process(self.input_iter.next(), size)
  File "/usr/lib/python2.6/dist-packages/duplicity/diffdir.py", line 187, in get_delta_iter
    for new_path, sig_path in collated:
  File "/usr/lib/python2.6/dist-packages/duplicity/diffdir.py", line 275, in collate2iters
    relem2 = riter2.next()
  File "/usr/lib/python2.6/dist-packages/duplicity/diffdir.py", line 344, in combine_path_iters
    refresh_triple_list(triple_list)
  File "/usr/lib/python2.6/dist-packages/duplicity/diffdir.py", line 330, in refresh_triple_list
    new_triple = get_triple(old_triple[1])
  File "/usr/lib/python2.6/dist-packages/duplicity/diffdir.py", line 316, in get_triple
    path = path_iter_list[iter_index].next()
  File "/usr/lib/python2.6/dist-packages/duplicity/diffdir.py", line 236, in sigtar2path_iter
    raise DiffDirException("Bad tarinfo name %s" % (tarinfo.name,))
DiffDirException: Bad tarinfo name .<email address hidden>/.system/20000000000000000000000000000000000000000000000000000
---->8----*snip*----

(Note: I replaced mail and im IDs due to privacy concerns. If you need "real" data I can provide that via PM.)

To me it looks like duplicity is expecting some file named ".<email address hidden>/.system/20000000000000000000000000000000000000000000000000000" which does not exist.

System-info:
duplicity 0.6.08
Ubuntu karmic
Python 2.6.4
Target filesystem is FTP

[Stefan Strasser (strada)]

I've seen the same error after working for several days - without actually mentioning a specific file. Cleanup and purge didn't help (did not show any errors).

I increased the verbosity and in my case it turned out to be a file somewhere deep below the following path:
/root/.cache/duplicity/7fdd4daf0969a512e2d6b6d043941dbd/...

Guessing that this directory is only needed as cache for speed up the backup-process I just deleted it and re-ran the backup. Now it worked again.

According to [1] it could be a problem related to very long path-file-names.

duplicity 0.6.08b
Ubuntu lucid
Python 2.6.5
Target system accessed by sFTP

[1] http://blog.gmane.org/gmane.comp.sysutils.backup.duplicity.general/month=20030801