[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Eero]

Can't you read Vej?

People have to use "a workaround" which isn't explained anywhere in the
documentation if a backup gets corrupted. It isn't even obvious from the
error message that an earlier backup got corrupted.

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Title:
  Backup fails every time after one incremental file is possibly
  corrupted

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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Vej]

Hello!

There is obviously nothing we can do about packages which got corrupted
on the backup media or during transfers.

So what exactly is this bugreport asking for?

Best Regards

Vej

** Changed in: deja-dup (Ubuntu)
   Status: Confirmed => Incomplete

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Title:
  Backup fails every time after one incremental file is possibly
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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Alessander Botti Benevides]

Thanks Naël, your suggestion on Comment #6 worked for me on Ubuntu
17.10.

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Title:
  Backup fails every time after one incremental file is possibly
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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: deja-dup (Ubuntu)
   Status: New => Confirmed

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Title:
  Backup fails every time after one incremental file is possibly
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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Nathanaël Naeri]

Thanks for this log. It shows that your current backup chain started on
Oct 10, contains the offending incremental backup (Dec 19 to Dec 20),
and has later incremental backups (three more on Dec 20, one on Dec 21,
one on Dec 22, one on Dec 30). You can see for yourself under "primary
backup chain" (you also have 9 older backup chains).

So your backups are apparently still performed, despite the error
message (!?!).

As far as I understand, the SHA1 hash mismatch means that the indicated
file (first volume of Dec 19 to Dec 20 incremental backup) is different
from when it was created and its SHA1 hash was written in the
accompanying .manifest file (a text file that stores the hashes of each
volume at creation time). Is it conceivable that the transfer of this
file to your backup location failed somehow? Or that it was modified
afterwards?

I think the easiest way for you to get rid of this issue is to delete
(or rather, move away) the tail of your current backup chain, starting
at the offending file, and launch an incremental backup to cover the Dec
19 to today period.

That won't tell us how this file got corrupted however, but I for one am
not able to help further.

You may also want to delete (or rather move away) Déjà-Dup's cache
directory (~/.cache/deja-dup) in case something weird creeped into it
and is causing a problem. It will be recreated with fresh information
downloaded from the backup location (manifest and signature files).

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Title:
  Backup fails every time after one incremental file is possibly
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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Eero]

The only error message that shows up is the one I already posted here.

DUPLICITY: ERROR 21
DUPLICITY: . Invalid data - SHA1 hash mismatch for file:
DUPLICITY: .  
duplicity-inc.20161219T001458Z.to.20161220T001456Z.vol1.difftar.gpg
DUPLICITY: .  Calculated hash: 3dde403f81e36268ce9b7f53478d9dd8301a439c
DUPLICITY: .  Manifest hash: b46782fb799c7c5a543ac88d9bfb7cc1df25d38c
DUPLICITY: . 

** Attachment added: "deja-dup.txt"
   
https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/1651396/+attachment/4798131/+files/deja-dup.txt

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Title:
  Backup fails every time after one incremental file is possibly
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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Nathanaël Naeri]

To create a new full backup, simply backup to a new location, or move
the files in the current location to some other place. Déjà Dup will
detect the absence of previous backups and start a new full backup.

The backup location is the directory that stores the duplicity files
that Déjà Dup produces (compressed and possibly encrypted
duplicity-... files). For
instance ftp://user@server:port/path/to/backup/location.

You may also want to run the incremental backup that fails, from the
command line, with verbose output, to try and understand what leads to
that failure, and help triage this bug, because right now we
unfortunately don't know enough to reproduce or fix it:

  $ DEJA_DUP_DEBUG=1 deja-dup --backup

As Aaron said Déjà Dup is a good balance between ease of use and
reliability. Since it is a front-end to duplicity, I would recommend
using duplicity directly for more reliability (see manpage for usage).
You would then avoid all the potential front-end bugs.

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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Eero]

> Have you tried to verify your backup or do a new full backup?

http://lmgtfy.com/?q=deja+dup+new+full+backup

Shows basically nothing... Where's the option for that? Maybe you should
tell me something concrete instead of pasting smart ass links?

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[Bug 1651396] Re: Backup fails every time after one incremental file is possibly corrupted

[Aaron Whitehouse]

Have you tried to verify your backup or do a new full backup?

> Can someone recommend a better backup software for personal use?
http://lmgtfy.com/?q=personal+backup+software+linux

There is a reason, though, that Deja Dup (which you are already using)
is the default in Ubuntu -- it is a pretty good balance of ease of use
and reliability.

Kind regards,

Aaron

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