Dear Alexis, thanks for your analysis.
I am on my way to repack sagetex
Cheers,
Jerome
On 02/02/2019 18:36, Alexis Murzeau wrote:
> On Fri, 1 Feb 2019 20:45:08 +0100 Paul Gevers <elbrus@debian.org> wrote:
>> reassign 921120 src:sagetex 3.2+ds-1
>> retitle 921120 sagetex (autopkgtest) depends misses python-tk
>> affects 921120 src:sagemath
>> thanks
>>
>> Hi Tobias, sagemath maintainers
>>
>> On 01-02-2019 20:35, Tobias Hansen wrote:
>>> I guess the solution is to add python-tk to Depends: in the sagetex autopkgtest control file.
>>
>> I think so too, thus reassigning. Mind you, I haven't checked if sagetex
>> needs the python-tk regular dependency even.
>>
>> Paul
>>
>
> Hi,
>
> I didn't know about sagetex before but checked what's wrong to unblock
> sphinx migration.
>
> I found that sagetex might require python-tk as a backend when using
> \sageplot in latex.
> Autopkgtest fail when testing that line [0]:
> ```
> \sageplot[width=.75\textwidth]{p, axes=False}
> ```
>
> So this is not really a test-only dependency, but also a sagetex itself one.
>
> Actually, I found in [1] that matplotlib can use many different
> backends. There are rendering backends and interactive backends. Cairo
> is a rendering backend for example, and TK is an interactive one.
> The default used backend is choosen according to different things
> (configuration file, environment variable, python function call).
>
> Actually, sagetex is using the default backend which is TkAgg and so
> require python-tk when doing `\sageplot`.
>
> => the minimal solution is to add a dependency on python-tk in sagetex.
>
> But I don't think sagetex require an interactive backend, but just
> something that can generate a pdf, eps of image file is enough.
> So a rendering backend could be enough for sagetex.
> Also, sagetex should not depend on user configuration of matplotlib.
>
> => So in the long run, I think sagetex should:
> - Depend on a specific rendering backend like cairo that does all
> required formats (eps, pdf, png and formats provided by users)
> - Use matplotlib.use('cairo') (or another backend) so only a known
> working backend is used and not whatever the user configured.
>
> According to [1], cairo is the only one to support multiple formats
> including eps, pdf and png.
>
> But switching now from the default python-tk to cairo might be a too big
> change now that the soft freeze is near and that it blocks other
> packages from migrating ...
>
> So I suggest to just add a dependency on python-tk in sagetex for buster
> and implement the other solution with longer thinking of impacts later.
>
> [0] https://salsa.debian.org/tex-team/sagetex/blob/master/example.tex#L97
> [1] https://matplotlib.org/faq/usage_faq.html#what-is-a-backend
>
--
Jerome BENOIT | calculus+at-rezozer^dot*net
https://qa.debian.org/developer.php?login=calculus@rezozer.net
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