[llvm-dev] Enable Contributions Through Pull-request For LLVM

[Brian Cain via llvm-dev]

Mehdi and team, thanks for taking the time to make process improvements
like this one. I hope we are able to find compromise or alleviate concerns
raised in this thread because I think it's a significant step forward to
switch to PRs. I look forward to having a streamlined way to stage my
patches for review and pre merge test.

I'd like to request that if we end up moving to PRs that we consider a long
term roadmap that allows for devs to summon pre merge test easily if not
automatically. And it would be ideal if I could maximize the scope of tests
(even if that means my commit would be optimistically included in a batch
for in-depth tests, even if maximal testing is opt-in).

Independent testing of my commit puts me at ease about submitting content
upstream and I suspect I'm not alone.  Reducing the likelihood of post
merge buildbot fallout means I would have to babysit my commits less (when
is it safe to log off and assume my commit has run the gauntlet?). Also I
really hate being responsible for a regression. Seems like some bots easily
catch "simple" things that are also pretty easy to forget to check.

Anyways, thanks again to the team for the tireless effort to make progress
here.  It's really appreciated!


On Wed, Nov 6, 2019, 11:32 PM Mehdi AMINI via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
>
> Now that we're on GitHub, we can discuss about pull-requests.
> I'd like to propose to enable pull-request on GitHub, as a first step as
> an experimental channel alongside the existing methods for contributing to
> LLVM.
> This would allow to find workflow issues and address them, and also LLVM
> contributors in general to start getting familiar with pull-requests
> without committing to switching to pull-requests immediately. The community
> should evaluate after a few months what would the next steps be.
>
> GitHub pull-requests is the natural way to contribute to project hosted on
> GitHub: this feature is so core to GitHub that there is no option to
> disable it!
>
> The current proposal is to allow to integrate contributions to the LLVM
> project directly from pull-requests. In particular the exact setup would be
> the following:
>
>   - Contributors should use their own fork and push a branch in their fork.
>   - Reviews can be performed on GitHub. The canonical tools are still the
> mailing-list and Phabricator: a reviewer can request the review to move to
> Phabricator.
>   - The only option available will be to “squash and merge”. This mode of
> review matches the closest our current workflow (both phabricator and
> mailing-list): conceptually independent contributions belongs to separate
> review threads, and thus separate pull-requests.
> This also allow the round of reviews to not force-push the original branch
> and accumulate commits: this keeps the contextual history of comments and
> allow to visualize the incremental diff across revision of the
> pull-request.
>   - Upon “merge” of a pull-request: *history is linear* and a single
> commit lands in master after review is completed.
>
> As an alternative staging proposal: we could enable pull-requests only for
> a small subset of sub-projects in LLVM (i.e. not LLVM/clang to begin with
> for example) in the repo. In this case, we would propose to begin with the
> MLIR project (as soon as it gets integrated in the monorepo). This would be
> a good candidate to be the guinea pig for this process since it does not
> yet have a wide established community of contributors, and the current
> contributors are already exclusively using pull-requests
> <https://github.com/tensorflow/mlir/pulls>.
>
> Here is a more complete doc on the topic:
> https://docs.google.com/document/d/1DSHQrfydSjoqU9zEnj3rIcds6YN59Jxc37MdiggOyaI
>
> Cheers,
>
> --
> Mehdi
>
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> llvm-dev at lists.llvm.org
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