Comment 14 for bug 1612554

Re-ran the incremental backup, but it fails with the same error while adding /var/log/lastlog, which is a sparse file with a reported size of 36Gb, but actually only 56k on disk. Can this be the cause?

---

(duplicity-venv) # ls -l /var/log/lastlog
-rw-rw-r-- 1 root utmp 367219431264 Aug 23 09:57 /var/log/lastlog

# du -k /var/log/lastlog
56 /var/log/lastlog

---

Selecting /var/log/lastlog
Comparing var/log/lastlog and var/log/lastlog
Getting delta of (var/log/lastlog reg) and (var/log/lastlog reg)
Releasing lockfile /root/.cache/duplicity/d485e8d753a7b2ad7aafce096f9fbb92/lockfile.lock
Removing still remembered temporary file /tmp/duplicity-0VnewC-tempdir/mktemp-MvQFNN-128
Removing still remembered temporary file /tmp/duplicity-0VnewC-tempdir/mkstemp-Lc2BZc-1
Traceback (most recent call last):
  File "/opt/duplicity-venv/bin/duplicity", line 1546, in <module>
    with_tempdir(main)
  File "/opt/duplicity-venv/bin/duplicity", line 1540, in with_tempdir
    fn()
  File "/opt/duplicity-venv/bin/duplicity", line 1391, in main
    do_backup(action)
  File "/opt/duplicity-venv/bin/duplicity", line 1522, in do_backup
    incremental_backup(sig_chain)
  File "/opt/duplicity-venv/bin/duplicity", line 671, in incremental_backup
    globals.backend)
  File "/opt/duplicity-venv/bin/duplicity", line 434, in write_multivol
    at_end = gpg.GzipWriteFile(tarblock_iter, tdp.name, globals.volsize)
  File "/opt/duplicity-venv/lib/python2.7/site-packages/duplicity/gpg.py", line 401, in GzipWriteFile
    new_block = block_iter.next()
  File "/opt/duplicity-venv/lib/python2.7/site-packages/duplicity/diffdir.py", line 523, in next
    result = self.process(self.input_iter.next())
  File "/opt/duplicity-venv/lib/python2.7/site-packages/duplicity/diffdir.py", line 218, in get_delta_iter
    (new_path, sig_path, sigTarFile))
  File "/opt/duplicity-venv/lib/python2.7/site-packages/duplicity/robust.py", line 38, in check_common_error
    return function(*args)
  File "/opt/duplicity-venv/lib/python2.7/site-packages/duplicity/diffdir.py", line 139, in get_delta_path
    delta_path.setfileobj(librsync.DeltaFile(old_sigfp, newfp))
  File "/opt/duplicity-venv/lib/python2.7/site-packages/duplicity/librsync.py", line 154, in __init__
    self.maker = _librsync.new_deltamaker(sig_string)
OverflowError: size does not fit in an int