[Debian-science-sagemath] Sage 7.6 testing migration blocked by giac

[Tobias Hansen]

On 06/20/2017 01:05 PM, Tobias Hansen wrote:
> On 06/20/2017 11:55 AM, Ximin Luo wrote:
>> Tobias Hansen:
>>> On 06/20/2017 10:56 AM, Ximin Luo wrote:
>>>> Tobias Hansen:
>>>>> Hi,
>>>>>
>>>>> dependencies of sage 7.6 have now started to migrate to testing, but
>>>>> sage 7.6 can't migrate because giac is blocked due to missing builds on
>>>>> armel, armhf and mipsel due to #855078. That means until giac can
>>>>> migrate, we have a broken sage 7.4 in testing.
>>>>>
>>>>> Ximin, did you see that there are new comments on #855078? Maybe they help?
>>>>>
>>>> Hi, I took a look and the build failures look unrelated to #855078. This bug is a segfault on non-x86 64-bit arches, the build failures we're seeing seem like build rule issues, and fixable. I'll take a look later today.
>>>>
>>>>> Also, any ideas how we can prevent such incomplete migrations that break
>>>>> the old sage version in the future?
>>>>>
>>>> I actually was not expecting giac to built on armhf/mipsel and was surprised that it did before. But if it's too hard to fix, the easy way to force the migration (for this and future packages) is to upload a version that only declares Architecture: amd64 i386.
>>>>
>>> I meant more generally. This can happen every time we upload a new bunch
>>> of packages for a new Sage version to unstable. If we don't get
>>> everything to migrate to testing together it can easily break Sage in
>>> testing.
>>>
>> In those situations, if we control the package, we could do similar to what we did in brial (0.8.5-4) and add a Breaks: sagemath (<= XXX) to prevent testing migration, until the newer version of sagemath and all its dependencies are ready to go in.
>>
>> X
> If that works, we should start doing this routinely. But are you sure it
> really works? brial 0.8.5-4 and sagemath 7.4-6 migrated to testing
> together, but that was because this sagemath version was uploaded after
> brial and depended on the brial version.

No that doesn't make sense. Seems like it was the Breaks that caused
them to migrate together.