Why would I need write access to the sagemath repo?

I would have thought that I'd "somehow" (no idea how) take over the branch 
and modify it.  Or are pull requests directly tied to a specific user?  In 
other words, what is the replacement for the following?

Alice:
git trac create "make sage even better"
...
git commit -m "initial attempt"
git trac push

Bob:
git trac checkout 34923
...editing...
git commit -m "improved attempt"
git trac push


Martin
On Wednesday, 8 February 2023 at 12:07:59 UTC+1 tobias...@gmail.com wrote:

> You need to use upstream (the official sage repo) instead of origin (your 
> fork) to fetch the PR: git fetch upstream 
> pull/PULL-REQUEST-ID/head:LOCAL-BRANCH-NAME see 
> https://github.com/sagemath/trac-to-github/blob/master/docs/Migration-Trac-to-Github.md#for-reviewing-a-change
>
> If you don't have an "update branch" button, then this means you currently 
> don't have write access to the sagemath repo and thus cannot modify PRs (we 
> still have to sort out all the permission stuff...). I've clicked the 
> button for you now.
>  
> On Wednesday, 8 February 2023 at 19:01:01 UTC+8 Martin R wrote:
>
>> Interesting, because the PR page is still the same.for me.
>>
>> I feel so stupid, I'm sorry, I need more help.  In particular, I get:
>>
>> martin@convex63:~/sage$ LANG=en git fetch origin pull/34974/head  
>> fatal: couldn't find remote ref pull/34974/head
>>
>> (Note that this is not *my* pull request, but somebody else's, who is 
>> trying to provide a fix for my (easy) ticket, I want to serve as reviewer.  
>> I do *not* want to give positive review to the pull request as it is 
>> currently.)
>>
>> I cloned sage according to "Otherwise, start afresh:" at 
>> https://github.com/sagemath/trac-to-github/blob/master/docs/Migration-Trac-to-Github.md
>>
>> I have:
>>
>> martin@convex63:~/sage$ git remote -v 
>> origin  g...@github.com:mantepse/sage.git (fetch) 
>> origin  g...@github.com:mantepse/sage.git (push) 
>> trac    https://github.com/sagemath/sagetrac-mirror.git (fetch) 
>> trac    https://github.com/sagemath/sagetrac-mirror.git (push) 
>> upstream        g...@github.com:sagemath/sage.git (fetch) 
>> upstream        g...@github.com:sagemath/sage.git (push)
>>
>> It is not clear to me what I should be doing to
>>
>> 1.) try the PR
>> 2.) enable the linting, building and doc checks.
>>
>> Please excuse me :-(
>>
>> Martin
>>
>> On Wednesday, 8 February 2023 at 11:37:57 UTC+1 dim...@gmail.com wrote:
>>
>>> On Wed, Feb 8, 2023 at 10:23 AM 'Martin R' via sage-devel 
>>> <sage-...@googlegroups.com> wrote: 
>>> > 
>>> > Since the failures are 
>>> > 
>>> > sage -t --random-seed=130442615951932153031063473470828108756 
>>> sage/schemes/elliptic_curves/ell_curve_isogeny.py # 1 doctest failed 
>>> > sage -t --random-seed=130442615951932153031063473470828108756 
>>> sage/schemes/elliptic_curves/ell_number_field.py # 2 doctests failed 
>>> > 
>>> > I assume that the PR is based on an old branch, but the PR page does 
>>> not contain "update branch".. It does contain "Merging is blocked", but I 
>>> don't really understand what this means. 
>>>
>>> I just did 
>>> git fetch origin pull/34974/head 
>>> (with origin being the main new GitHub repo for sage) 
>>> to see the git log, and magically on 
>>> https://github.com/sagemath/sage/pull/34974 
>>> there is now 
>>>
>>> This branch is out-of-date with the base branch 
>>> Merge the latest changes from develop into this branch. 
>>>
>>> and "Update branch" button just above "Merge is blocked" 
>>> (which is just a reflection of the fact that develop branch is 
>>> protected, you can't push/merge there (I can, as Admin, though)) 
>>>
>>> Perhaps that was due to the base branch being so old, that no branch 
>>> info on that was computed by GitHub ahead of my fetch. 
>>>
>>>
>>>
>>> > 
>>> > Martin 
>>> > On Wednesday, 8 February 2023 at 10:42:24 UTC+1 dim...@gmail.com 
>>> wrote: 
>>> >> 
>>> >> 
>>> >> 
>>> >> On Wed, 8 Feb 2023, 08:41 'Martin R' via sage-devel, <
>>> sage-...@googlegroups.com> wrote: 
>>> >>> 
>>> >>> I cannot see any "update branch" button on 
>>> https://github.com/sagemath/sage/pull/34974 
>>> >>> 
>>> >>> Where should I look for it? 
>>> >> 
>>> >> 
>>> >> This button is somewhere near the ticket status at the bottom - if 
>>> your base is indeed outdated. 
>>> >> 
>>> >> But check the commits on the branch. 
>>> >> I went on the merging spree last night, to gauge the performance of 
>>> the CI a bit. 
>>> >> 
>>> >>> 
>>> >>> Martin 
>>> >>> 
>>> >>> On Wednesday, 8 February 2023 at 00:32:49 UTC+1 dim...@gmail.com 
>>> wrote: 
>>> >>>> 
>>> >>>> On Tue, Feb 7, 2023 at 10:42 PM David Roe <roed...@gmail.com> 
>>> wrote: 
>>> >>>> > 
>>> >>>> > Thanks Dima! 
>>> >>>> > 
>>> >>>> > There is now an "Update branch" button at the bottom of each PR, 
>>> which you can press if you're the originator of the PR and it will merge in 
>>> develop 
>>> >>>> 
>>> >>>> (there is an option to rebase rather than to merge on this button - 
>>> >>>> although automatic rebase is less guaranteed) 
>>> >>>> 
>>> >>>> I was impatient and I pressed this for a number of PRs myself :-) 
>>> >>>> I see now CI passing for quite a number, looks quite good. 
>>> >>>> 
>>> >>>> Dima 
>>> >>>> 
>>> >>>> > David 
>>> >>>> > 
>>> >>>> > On Tue, Feb 7, 2023 at 8:18 PM Dima Pasechnik <dim...@gmail.com> 
>>> wrote: 
>>> >>>> >> 
>>> >>>> >> done 
>>> >>>> >> 
>>> >>>> >> On Tue, Feb 7, 2023 at 6:54 PM John Cremona <john.c...@gmail.com> 
>>> wrote: 
>>> >>>> >> > 
>>> >>>> >> > Strong yes from me. 
>>> >>>> >> > 
>>> >>>> >> > #34987 concerns a 3-line doctest where only the first has a 
>>> #long time tag thought the other lines depend on the first having been run, 
>>> so causes a failure when tested without --long. The fix adds two # long 
>>> time tags 
>>> >>>> >> > #34964 trims some whitespace and changes "" to r""" in a few 
>>> necessary places. 
>>> >>>> >> > 
>>> >>>> >> > On Tue, 7 Feb 2023 at 18:18, David Roe <roed...@gmail.com> 
>>> wrote: 
>>> >>>> >> >> 
>>> >>>> >> >> Hi all, 
>>> >>>> >> >> Currently, almost all of the PRs on github aren't passing CI, 
>>> and thus have red Xs. The problem can be resolved by merging #34964 and 
>>> #34987. Several of us at Sage Days 117 propose to merge these two PRs into 
>>> the develop branch on Github tonight, to help improve the reviewing process 
>>> for everyone here, as well as for people who are getting used to the new 
>>> Github workflow. We don't anticipate this becoming a regular occurrence 
>>> (it's mainly a consequence of the slightly different testing process on 
>>> trac and github). 
>>> >>>> >> >> 
>>> >>>> >> >> If we hear no objections, we'll proceed in an hour and a half 
>>> (8:45pm CET, 2:45pm EST, 11:45am PST). 
>>> >>>> >> >> David 
>>> >>>> >> >> 
>>> >>>> >> >> -- 
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>>>  
>>>
>>> >>>> >> > 
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>>>  
>>>
>>> >>>> >> 
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>>>  
>>>
>>> >>>> > 
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>>>
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>>>
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>>>  
>>>
>>>
>>

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