Comment 0 for bug 1091269

I have found a bug similar to #613244.

It seems that some files are corrupted when the backup is interrupted and resumed when using --no-encryption option.

The make-ctrl-c-test.sh test fails if I add the --no-encryption option to duplicity. Without this option it works fine.

I have added an option to make-ctrl-c-test.sh test to run it with or without encryption (patch attached).

I have seen this bug in the current duplicity quantal version (0.6.19-0ubuntu2) and in the last bazaar revision (897).

I also attached a patch that seems to fix this issue. I don't know anything about duplicity internals, so I don't know if this patch is correct or it will break something. Actually, I have ran the run-test script and it fails in test_GzipWriteFile test. But hopefully this can help you to fix the problem.

These are the final log lines of the make-ctrl-c-test.sh script, with and without encryption.

make-ctrl-c-test.sh with encryption:
...
Restoring backups...
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Mon Dec 17 14:07:59 2012
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Mon Dec 17 14:08:13 2012
Diff between /lib and /tmp/restore1
Diff between /tmp/restore1 and /tmp/restore2

make-ctrl-c-test.sh with --no-encryption and without fix applied:
...
Restoring backups...
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Mon Dec 17 14:08:55 2012
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Mon Dec 17 14:09:16 2012
Diff between /lib and /tmp/restore1
Diff between /tmp/restore1 and /tmp/restore2
Files /tmp/restore1/modules/3.5.0-19-generic/kernel/drivers/infiniband/hw/qib/ib_qib.ko and /tmp/restore2/modules/3.5.0-19-generic/kernel/drivers/infiniband/hw/qib/ib_qib.ko differ

make-ctrl-c-test.sh with --no-encryption and fix applied:
...
Restoring backups...
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Mon Dec 17 14:19:43 2012
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Mon Dec 17 14:20:14 2012
Diff between /lib and /tmp/restore1
Diff between /tmp/restore1 and /tmp/restore2

The test_GzipWriteFile fails with this error:
======================================================================
FAIL: test_GzipWriteFile (__main__.GPGTest)
Test GzipWriteFile
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/gpgtest.py", line 135, in test_GzipWriteFile
    assert size - 64 * 1024 <= os.stat("testfiles/output/gzwrite.gz").st_size <= size + 64 * 1024
AssertionError

----------------------------------------------------------------------
Ran 8 tests in 1.326s

FAILED (failures=1)
Test failed