Re: [Duplicity-talk] Re: Duplicity using more space than needed?

[Kenneth Loafman]

Thanks for the testcase.  I'm going to add it to the tests in the 
repository, once I get this fixed.

Both duplicity and rdiff use librsync for deltas, so the problem has to 
be in that we handle the parameters or the calls differently than rdiff.

...Ken

Fabiano Bonin wrote:
> Look at this test case. I think it reproduces the problem.
>
> First, run the script 'testcase_script.sh' attached to this message.
> It will create the following files in /var/tmp/testcase:
>
> snapshot1 (48MB)
> snapshot2 (48MB)
> snapshot1.sig (287KB)
> snapshot2.delta (20MB)
>
> Comment: for each block of 5000 bytes of snapshot1, i changed the last
> 25 bytes in snapshot2. All bytes where generated randomly.
>
> snapshot2.delta is the uncompressed rdiff delta file between snapshot1
> and snapshot2.
>
> Then, run the following commands:
>
> ==============================
> export PASSPHRASE=testcase
>
> rm /var/tmp/testcase_source/* -rf
> rm /var/tmp/testcase_destination/* -rf
>
> cp snapshot1 /var/tmp/testcase_source/snapshot
>
> duplicity /var/tmp/testcase_source file:///var/tmp/testcase_destination
>
> du --max-depth 1 -h /var/tmp/testcase_destination
>     
> rm -f /var/tmp/testcase_source/snapshot
>
> cp snapshot2 /var/tmp/testcase_source/snapshot
>
> duplicity /var/tmp/testcase_source file:///var/tmp/testcase_destination
>
> du --max-depth 1 -h /var/tmp/testcase_destination
> ==============================
>
> Here, in the second pass, the destination size change is 47.9MB. The
> last 'du' command will show the folder /var/tmp/testcase_destination
> with 97MB.
>
> Regards,
>
> Fabiano.
>
>
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