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[Andreas <question264755@xxxxxxxxxxxxxxxxxxxxx>]

New question #264755 on Duplicity:
https://answers.launchpad.net/duplicity/+question/264755

I have created a full backup (approx. 262GB) using version 0.6.23. Backup destination was a folder on an external USB drive. During backup, the power supply of the USB drive was interrupted and the backup stopped.

Repeating the last (full) backup command line I was happy that it found the latest volume and appeared to take the appropriate actions, here's part of the out (luckily, I had saved all logs, both of the first and the second run):

[...]
Found primary backup chain with matching signature chain:
-------------------------
Chain start time: Sun Apr  5 18:05:44 2015
Chain end time: Sun Apr  5 18:05:44 2015
Number of contained backup sets: 1
Total number of contained volumes: 2338
 Type of backup set:                            Time:      Num volumes:
                Full         Sun Apr  5 18:05:44 2015              2338
-------------------------
No orphaned or incomplete backup sets found.
PASSPHRASE variable not set, asking user.
PASSPHRASE variable not set, asking user.
RESTART: Volumes 2338 to 2338 failed to upload before termination.
         Restarting backup at volume 2338.
Deleting /tmp/duplicity-IFJ44h-tempdir/mktemp-NtXX3H-2
Restarting after volume 2337, file andreas_home/Documents/05 Bilder/Jahresringe/2009/2009_03_10/IMG_6333.JPG, block 48
A .
A andreas_home
A andreas_home/Documents
A andreas_home/Documents/00 to do
A andreas_home/Documents/00 to do/2013-04-02 to do.xls
A andreas_home/Documents/00 to do/2015-03-23 Matschbirne Fotos
A andreas_home/Documents/00 t
[...]

I did "check" the archive using the "--list-current-files" option and it looked fine. So I proceeded to do the repartitioning job that I intended to do and now I am facing the restore process. I would like to mention that I had successfully tested the backup/restore process with a some 5GB big folder containing plenty of files.

Now when trying to do the full restore I get hash mismatches. Looking through existing reports I found there are tons of these bug reports, mainly back in the older versions, but if I had known I would have refrained from using duplicity and rather done a simple copy/paste backup. aaargh.

I get this kind of errors:

[...]
Writing 10 Aqua/80 Dienstleister/Hampe/Hahnauslaufkorrekturen Feb2008/NichtOkay1.JPG of type reg
Deleting /tmp/duplicity-r6cAfi-tempdir/mktemp-kVpriE-8
Processed volume 7 of 8661
Invalid data - SHA1 hash mismatch for file:
 duplicity-full.20150405T160544Z.vol4824.difftar.gpg
 Calculated hash: a229d6d62c6c0cb74eb523a32cf560583eb917db
 Manifest hash: b90a7f7e93407f3db6833869d75e8a049161932f

...which causes the process to stop.

question 1) what is the command-line option to skip the problematic volume/file and carry on? --force and --ignore-errors won't do the job.

For now, I only found descriptions of how to manually extract the surviving files, but I have to admit I am not looking forward to do this with 500'000 files manually.

I have 8661 volume files, each having a size of 26.3MB (5631 volumes) or 26.2MB (3030 volumes). The very last volume #8661 has got only 26.1MB size. So it looks to me as those files were "complete".

question 2) any hints what is going wrong and how to do a clean restore?


Many thanks in advance,
Andreas.


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