Re: Corrupted output on errors

On 20/11/2021 14:31, Denis Corbin wrote:
> Hi John,
> 

[...]

>>
>> Now that this is cleared up, I can see the errors:
>>
>> Restoration of FSA for /bakfs/other-backups/dar/ada/var/log/sysstat aborted: Skipping backward is not possible on a pipe
>> Error while restoring data: Error while reading FSA from archive: Reached end of file before all data could be read
>> Final memory cleanup...
>> Error while restoring data: Error while reading FSA from archive: Reached end of file before all data could be read
>>
>> It then exits with error 5.
>>
>> This archive was generated by dar 2.6.13 on a Raspberry Pi running ext4 and unpacked
>> by 2.7.2 on x86_64 running ZFS.
> 
> This error can come from a corrupted transfer between hosts or from dar
> itself (bug). Could you thus:
> - check that the backup testing (dar -t <backup>) succeeds with dar
> 2.6.13 on Raspberry?
> - make a sha1 sum of the dar backup on Raspberry?
> - check this sha1 sum against the dar backup on the x86_64
> - test the backup on x86_64 (dar -t <backup>) using dar 2.7.2 ?
> 
> This should clarify whether the problem comes from dar or not.
> 
>>
>> The extraction command was:
>>
>> dar --dirty-behavior no-warn --sequential-read -w -x - -R /bakfs/other-backups/dar/ada
>>
>> And it was generated with:
>>
>> Running dar -q -c - --aux /var/local/dar/1637242636 -A \
>> /var/local/dar/1637182897 -R /baksnap --empty-dir \
>> --retry-on-change 0 -P run -P tmp -P proc -P sys -P dev \
>> -P var/tmp -P var/cache/apt/archives -P media -P mnt \
>> -P cdrom -P var/cache/apt -P var/lib/mlocate -P var/lib/apt/lists \
>> -P var/log/journal -P var/spool/nncp -P var/local/dar \
>> -P var/cache/apt -P mythmount -P */no-backup -P home/*/.cache \
>> -P var/log/*log
> 
> Thanks for that, I have no Rapberry board to test with, but I will check
> this configuration between a 32 bits and 64 bits Debian OS.

no problem found between 32 and 64 bits OS.

I just noted that you were using --sequential-read mode, could you test
the restoration in normal mode to see if the problem could be linked to
that feature (the problem could be triggered by the failure to skip
backward)

And thus, I would need more info about the context that lead dar to try
skipping backward: could you provide a few couples of line of output
that showed just before?

Thanks,
Denis

[...]

> 
> Cheers,
> Denis
> 
>