[Duplicity-talk] gpg backup corruption

[Nicolas Aspert]

Hello

I have been experiencing some kind of gpg corruption when performing 
incremental backups. Duplicity now dies with this message each time:

Warning, found incomplete backup sets, probably left from aborted session
Traceback (most recent call last):
  File "/usr/bin/duplicity", line 482, in ?
    with_tempdir(main)
  File "/usr/bin/duplicity", line 477, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 470, in main
    incremental_backup(sig_chain)
  File "/usr/bin/duplicity", line 203, in incremental_backup
    bytes_written = write_multivol("inc", tarblock_iter, globals.backend)
  File "/usr/bin/duplicity", line 102, in write_multivol
    globals.gpg_profile,globals.volsize)
  File "/usr/lib64/python2.4/site-packages/duplicity/gpg.py", line 213, 
in GPGWriteFile
    data = block_iter.next(bytes_to_go).data
  File "/usr/lib64/python2.4/site-packages/duplicity/diffdir.py", line 
407, in next
    result = self.process(self.input_iter.next(), size)
  File "/usr/lib64/python2.4/site-packages/duplicity/diffdir.py", line 
261, in get_delta_iter_w_sig
    for new_path, sig_path in collated:
  File "/usr/lib64/python2.4/site-packages/duplicity/diffdir.py", line 
173, in collate2iters
    for relem2 in riter2: yield (None, relem2)
  File "/usr/lib64/python2.4/site-packages/duplicity/diffdir.py", line 
234, in combine_path_iters
    refresh_triple_list(triple_list)
  File "/usr/lib64/python2.4/site-packages/duplicity/diffdir.py", line 
222, in refresh_triple_list
    new_triple = get_triple(old_triple[1])
  File "/usr/lib64/python2.4/site-packages/duplicity/diffdir.py", line 
211, in get_triple
    try: path = path_iter_list[iter_index].next()
  File "/usr/lib64/python2.4/site-packages/duplicity/diffdir.py", line 
156, in sigtar2path_iter
    sigtarobj.close()
  File "/usr/lib64/python2.4/site-packages/duplicity/dup_temp.py", line 
107, in close
    assert not self.fileobj.close()
  File "/usr/lib64/python2.4/site-packages/duplicity/gpg.py", line 139, 
in close
    self.gpg_process.wait()
  File "/usr/lib/python2.4/site-packages/GnuPGInterface.py", line 639, 
in wait
    raise IOError, "GnuPG exited non-zero, with code %d" % (e << 8)
IOError: GnuPG exited non-zero, with code 131072

When running with debug output, it always spits a "invalid packet 
(ctb=14)" before crashing.

I am not sure whether this can be fixed, but I'd like to see the 
possibility to ignore the faulty incremental backup (or remove it) to 
try to recover things. Unless I have missed something, it seems to me 
the only possibility is to perform a full backup again...

Best regards
Nicolas