[Borgbackup] "borg check" without reading every byte

[John Goerzen]

So I did an experiment:

rm data/21/219999
borg check -v --archives-only

This did not flag any errors.  Now it's possible that the segment I
deleted was not holding metadata, and therefore never visited.  However,
I find it odd that it didn't at least notice it was missing.  It would
be nice to check that without reading every single bit of data to
recheck CRCs, I guess.

John

On 12/15/2016 01:54 PM, Marian Beermann wrote:
> On 15.12.2016 20:35, John Goerzen wrote:
>> Yes, I read that, but the documentation also says this:
>>
>> For the repository check, "For all objects stored in the segments, all
>> metadata... and all data is read."
>>
>> Although now that I reread the description of the archive check, perhaps
>> there is a case where it does not have to reread all data.  I'll see if
>> I can validate this.
> Archives check only works with metadata.
>
>> Second, the consistency and correctness of the
>> archive metadata is verified:
> Cheers, Marian
>
>> Thanks,
>>
>> John
>>
>>
>> On 12/15/2016 01:06 PM, Marian Beermann wrote:
>>> Hi John
>>>
>>> from the check help page:
>>>
>>>   --repository-only     only perform repository checks
>>>   --archives-only       only perform archives checks
>>>
>>> Cheers, Marian
>>>
>>> On 15.12.2016 19:38, John Goerzen wrote:
>>>> Hi folks,
>>>>
>>>> I have a question about borg check.  I'm anticipating storing a backup
>>>> on a remote host to which I do not have the ability to install borg
>>>> (think sshfs or webdav or so).  From the manpage description, it looks
>>>> as if borg check will read every bit of data in the repo at least
>>>> twice.  Is there a way for it to check the consistency of the metadata
>>>> trees without checking the CRC of every segment or reading every bit of
>>>> file data?
>>>>
>>>> (I am pondering a move from obnam, which does have this feature)
>>>>
>>>> Thanks,
>>>>
>>>> John
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