bug#29363: Single test failure building Guix

[Rutger Helling <rhelling@mykolab.com>]

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Hi Marius, 

your patch did the trick, thanks! 

I'm indeed on Btrfs (with LUKS), no SSD though. 

On 2017-11-21 01:31, Marius Bakke wrote:

> Hi Rutger,
> 
> Rutger Helling <rhelling@mykolab.com> writes:
> 
>> when building Guix with 'guix build guix' I keep running into a single 
>> test failure. I've attached the test-suite.log.
> 
> Is this a Btrfs system by any chance, possibly on an SSD?
> 
>> test-name: dead path can be explicitly collected
>> location: /tmp/guix-build-guix-0.13.0-10.0b4c385.drv-0/source/tests/store.scm:178
>> source:
>> + (test-assert
>> +   "dead path can be explicitly collected"
>> +   (let ((p (add-text-to-store
>> +              %store
>> +              "random-text"
>> +              (random-text)
>> +              '())))
>> +     (let-values
>> +       (((paths freed) (delete-paths %store (list p))))
>> +       (and (equal? paths (list p))
>> +            (> freed 0)
>> +            (not (file-exists? p))))))
>> actual-value: #f
>> result: FAIL
> 
> I can reproduce this error on two different systems that have
> Btrfs+LUKS+SSD, and the problem is that freed == 0.
> 
> I suspect it's related to Btrfs' "lazy" reporting of disk space, but
> haven't dug very far.
> 
> Until we figure out what's going on, I suggest applying the patch
> below.  Can you confirm that it works on your system?
> 
> Ludo, WDYT?

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