[Debian-science-sagemath] GAP: issue related to compressed manual.six: PATCHES

[Ximin Luo]

Bill Allombert:
> On Fri, Dec 02, 2016 at 05:39:24AM +0000, Jerome BENOIT wrote:
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>> Hello All,
>>
>> finally I figured out a way to implement compression (gz) with the help
>> of the zlib library rather than through gzip pipes. So snow Sage no more
>> emits failures concerning GAP. Please find in attachment a patch that replaces
>> gzip pipes with zlib high level functions, as well concomitant patches.
>> I have also attached an updated d/p/series files: note that the patch
>> d/p/fix-compressed-six-files is no more necessary and that some autoconf
>> scripts have to be regenerated (I followed the hint given by dpkg-builpackage).
>>
>> The material could not be deposited at Alioth as there is no GAP repository there.
>> On the other hand, I have just uploaded the source ball, the debian stuff
>> and the debballs at the Sage repository deb-sci-sage (see the Debain Sage page
>> [1] for more inrmation); therefore it can be easily tested within a schroot environment.
>>
>> At last, as the main patch, namely fix-zlib-stringfile,  slightly improves
>> the GAP kernel itself, it must also be applied to the libGAP package:
>> I will do if it is effectively applied to GAP.
> 
> I am sorry, but I cannot apply that to gap. We are already during the
> freeze.  This is too intrusive and does not solve any issue with gap.
> 
> However you can send this upstream.
> 
> But more importantly, this does not fix the underlying Sage bug that it
> messes with signal of subprocesses. There are other uses of pipes in
> GAP, and there are other software in Sage that use pipes+gzip (PARI/GP
> at least).  So this patch is fixing the symptom and not the problem.
> Using pipes is perfectly legitimate and has to be supported by Sage.
> 
> This bug should be reassigned to sage.
> 

Hi all,

Sorry I only just briefly scanned through the thread now. However I found this post relating to gzip, pipes and python:

https://blog.nelhage.com/2010/02/a-very-subtle-bug/

which summarises the bug report here: https://bugs.python.org/issue1652

I hope this helps. If not, sorry for the noise. I will try to debug this myself on Thursday or Friday.

X

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