Public bug reported:

Ubuntu 14.04.4 LTS
duplicity 0.6.23-1ubuntu4.1
python2.7 2.7.6-8ubuntu0.2

Backup command used:
duplicity --exclude-filelist "/root/.duplicity_excludes" --full-if-older-than 
7D --log-file "/var/log/duplicity" --no-encryption --volsize 100 / "$S3BUCKET"

Backups have been running fine for several months, but since last night
it started giving following error:

---

Reading filelist /root/.duplicity_excludes

Sorting filelist /root/.duplicity_excludes

Local and Remote metadata are synchronized, no sync needed.

Last full backup date: Sun Aug  7 23:30:02 2016

Traceback (most recent call last):

  File "/usr/bin/duplicity", line 1494, in <module>

    with_tempdir(main)

  File "/usr/bin/duplicity", line 1488, in with_tempdir

    fn()

  File "/usr/bin/duplicity", line 1337, in main

    do_backup(action)

  File "/usr/bin/duplicity", line 1470, in do_backup

    incremental_backup(sig_chain)

  File "/usr/bin/duplicity", line 637, in incremental_backup

    globals.backend)

  File "/usr/bin/duplicity", line 405, in write_multivol

    at_end = gpg.GzipWriteFile(tarblock_iter, tdp.name, globals.volsize)

  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 383, in
GzipWriteFile

    new_block = block_iter.next()

  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line
518, in next

    result = self.process(self.input_iter.next())

  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line
213, in get_delta_iter

    (new_path, sig_path, sigTarFile))

  File "/usr/lib/python2.7/dist-packages/duplicity/robust.py", line 37,
in check_common_error

    return function(*args)

  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line
134, in get_delta_path

    delta_path.setfileobj(librsync.DeltaFile(old_sigfp, newfp))

  File "/usr/lib/python2.7/dist-packages/duplicity/librsync.py", line
150, in __init__

    self.maker = _librsync.new_deltamaker(sig_string)

OverflowError: size does not fit in an int

** Affects: duplicity (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: Python Roundup #23306
   http://bugs.python.org/issue23306

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https://bugs.launchpad.net/bugs/1612554

Title:
  duplicity backup fails with OverflowError: size does not fit in an int

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