Hello,

Tanguy Le Carrour <tanguy@bioneland.org> ezt írta (időpont: 2019. nov. 13.,
Sze 9:03):

> Hi Marius, hi Gábor!
>
> Le 11/04, Gábor Boskovits a écrit :
> > Tanguy Le Carrour <tanguy@bioneland.org> ezt írta (időpont: 2019. nov.
> 4., H, 11:50):
> > > Le 11/04, Gábor Boskovits a écrit :
> > > > Tanguy Le Carrour <tanguy@bioneland.org> ezt írta (időpont: 2019.
> nov. 4.,
> > > > > `./pre-inst-env guix build --rounds=2 python@3.8` always fails
> with:
> > > > > """
> > > > > output ‘/gnu/store/…-python-3.8.0’ of
> ‘/gnu/store/…-python-3.8.0.drv’
> > > > > differs from previous round
> > > > > """
> > > […]
> > > First time I hear of diffoscope! I had a look at the output (html
> > > attached), but couldn't make sense of it!
> > Nice, one thing that looks problematic is that there seems to be a
> mismatch
> > in the hash.
> >  At one line you can see the shabang modified to a different path...
> > I don't yet know the reason of that, but it quite suspicious...
> > One thing, when dealing with things like like this, one should first fix
> > the readable differences,
> > and only then dig deeper, as fixing those often cascade, and fix more
> than
> > anticipated.
>
> Sorry it took me so long, but I finally had some time yesterday evening to
> go
> through the report!
>
> I found 4 types of errors:
>
>  1. `stat` reporting a different "Birth" for folders, which I assume are
>     perfectly normal.
>
This is fine, you can use the option to ignore directory metadata from
diffoscope output, so that this won't pollute the output.

>  2. different paths for `python3.8` in the shebang of some scripts.
>  3. different paths in prefix for `python3.8` (some origin as above).
>
3 and 2 should be investigated. Do you get these diffs even with grafts
disabled?

>  4. everything else is "Max report size reached"!
>
Should not be a problem, it shows the diff is too big. You have diffoscope
options to increase that, but as problems are fixed the output should
return to the normal range.

>
> I don't really know where to go from here? Am I supposed to investigate
> errors of type 4?!
>
> Regards,
>
> --
> Tanguy
>
Best regards,
g_bor

>