[Debian-science-sagemath] charpoly

[Jerome BENOIT]

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On 19/11/16 18:37, Jerome BENOIT wrote:
> Hello,
> 
> On 19/11/16 17:43, Bill Allombert wrote:
>> On Sat, Nov 19, 2016 at 05:18:37AM +0000, Jerome BENOIT wrote:
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>>> Hello Forum,
>>>
>>> as a matter of fact, discarding the patch <GAP>/debian/patches/fix-compressed-six-files
>>> fixes the doctests failures related to gap (and libgap).
>>>
>>> I have just uploaded un unpatched version of gap at the deb-sci-sage repository:
>>> please double check !
> 
>> Hello Jerome,
>> If I remove fix-compressed-six-files and rebuild the packages, then GAP
>> is unable to read compressed old-style .six files.
> 
>> For example install gap-alnuth and do
>> ?FieldByMatrices
> 
> Indeed, I can reproduce this issue on two distinct schroots, one with the patch applied and one without it.

> 
> 
>> With the patch fix-compressed-six-files applied, I get
>> gap> ?FieldByMatrices
>> Help: several entries match this topic - type ?2 to get match [2]
> 
>> [1] Alnuth: FieldByMatrices
>> [2] Alnuth: FieldByMatricesNC
> 
>> With the patch removed fix-compressed-six-files, I get
> 
>> gap> ?FieldByMatrices
>> Help: no matching entry found
>> Help: 'FieldByMatrices' is currently undocumented.
>>       For details, try ?Undocumented Variables
> 
>> which is wrong.

What I meant is that I can reproduce this results.

> 
>> New-style .six files start by a comment lines so are not affected by the
>> upstream gap bug (which cause the first line to be lost, because rewind
>> does not work on pipe).
> 
First the issue on Sage also occurs for the new format (#SIXFORMAT ....).
In fact, it occurs only when the manual.six is compressed: if, for debugging purpose,
each installed compressed manual.six is uncompressed, the doctests involving compressed manual.six
become successful.

So the issue seems also related to the patch fix-gzip-stringfile which was integrated in the last version of GAP.
In the header of the patch, we read: `We use pipes for reading gzipped files'.
What leads me to the question: why we do not use zlib instead ?

I have also noticed that Sage[Math] works in GAP `-p' mode, what is a bit confusing for me now. 


>> So it seems to me you need to apply fix-compressed-six-files to libgap
>> also.
> 
> The path fix-compressed-six-files does not affect libgap since it patchs only a GAP Include file,
> more precisely <GAP>/lib/helpbase.gi , while libgap deals with none of them.
> libgap only deals with the file in <GAP>/src  [1,2]
> Second, the patches that deal with the material in <GAP>/src are applied [3].
> 
> [1] http://sources.debian.net/src/libgap-sage/4.8.6%2B3%2B20160327g69a66f0%2Bdsx-1/debian/get-orig-source.sh/
> [2] http://sources.debian.net/src/libgap-sage/4.8.6%2B3%2B20160327g69a66f0%2Bdsx-1/debian/rules/
> [3] http://sources.debian.net/src/libgap-sage/4.8.6%2B3%2B20160327g69a66f0%2Bdsx-1/debian/patches/series/ (the two first ones)
> 
> So now, I think that the patch fix-compressed-six-files might be improved.
> 
> But before, we must find a way to reproduce in `pure' GAP the issue effectively observed within Sage.
> 
> Thanks,
> Jerome

Thanks,
Jerome


> 
> 
> 
>> Cheers,
>> Bill.
> 
> 
> 
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