[s3ql] Can I get the sha256 value for a file stored with s3ql without downloading it?

[Andrei]

Hi,

Can I get the sha256 value for a file stored with s3ql without downloading
it? (Maybe with one of the utilities functions or maybe by connecting to
the sqlite db?)


Thanks,

Andrei

[Nikolaus Rath]

Post by Andrei
Hi,
Can I get the sha256 value for a file stored with s3ql without downloading
it? (Maybe with one of the utilities functions or maybe by connecting to
the sqlite db?)

Nope. S3QL only stores SHA values per block. To look at those, you could
use the sqlite CLI to look at the database. There is no convenient
utility for that.


Best,
-Nikolaus

[Andrei]

Thanks. May be a good idea for a feature. We could then check whether our
local files have not been corrupted, without downloading the files from
where they are stored on s3ql (and incur download/transfer fees).

[Nikolaus Rath]

Post by Andrei
Thanks. May be a good idea for a feature. We could then check whether our
local files have not been corrupted, without downloading the files from
where they are stored on s3ql (and incur download/transfer fees).

For that purpose, you could also just run sha256sum > SHA256SUM before copying the files
:-).

Best,
-Nikolaus

[William Blunn]

It's fundamentally impossible.

s3ql provides a filesystem with POSIX semantics --- it is not an object
store.

I can open a file, seek to any offset, and write one byte. If there was a
byte at that offset that was different to what I just wrote, or I wrote off
the end of the file, then the digest of the file will then change in a way
which can only be found by digesting the whole file.

Regards,

Bill

Post by Andrei
Thanks. May be a good idea for a feature. We could then check whether our
local files have not been corrupted, without downloading the files from
where they are stored on s3ql (and incur download/transfer fees).
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