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

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

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

Status in Duplicity:
  In Progress
Status in duplicity package in Ubuntu:
  New

Bug description:
  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

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