[cfe-dev] [lldb-dev] [GitHub] RFC: Enforcing no merge commit policy

[Eric Christopher via cfe-dev]

Honestly I'm looking forward to GitHub's interface here.

On Tue, Mar 19, 2019, 1:25 PM James Y Knight via lldb-dev <
lldb-dev at lists.llvm.org> wrote:

> I think we definitely will want to support github PRs, at the very least
> as an _option_, even if we continue running/preferring phabricator.
>
> Github PRs are how everyone who is not already super-involved in the llvm
> project is going to want to contribute changes, and we ought to be as
> welcoming as possible to such users.
>
> On Tue, Mar 19, 2019 at 3:15 PM Roman Lebedev via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> On Tue, Mar 19, 2019 at 10:00 PM Tom Stellard via cfe-dev
>> <cfe-dev at lists.llvm.org> wrote:
>> >
>> > Hi,
>> >
>> > I would like to follow up on the previous thread[1], where there was a
>> consensus
>> > to disallow merge commits in the llvm github repository, and start a
>> discussion
>> > about how we should enforce this policy.
>> >
>> > Unfortunately, GitHub does not provide a convenient way to fully
>> enforce this policy.
>> > We can enforce it for pull requests, but not for direct pushes to the
>> master branch,
>> > so we will have to come up with our own solution if we want to
>> completely prevent
>> > merge commits.  I've spent some time looking into this and here are a
>> few
>> > options that I've come up with (If you are a GitHub expert and have
>> other
>> > suggestions, please let us know):
>> >
>> > 1. Have either a status check or use the "Rebase and Merge" policy for
>> pull requests
>> > to disallow merge commits.  Disable direct pushes to the master branch
>> and update the
>> > git-llvm script to create a pull request when a developer does `git
>> llvm push` and
>> > then have it automatically merged if there are no merge commits.
>> >
>> > 2. Enforce no merge commits for pull requests, but sill allow
>> developers to push directly
>> > to master without checking for merge requests.  This is essentially a
>> best effort
>> > approach where we avoid having to implement our own custom work-flow
>> for committing,
>> > while accepting the possibility that someone might accidentally push a
>> merge commit.
>> >
>> > 3. Disable direct pushes to master, don't update the git-llvm script
>> and require all
>> > developers to use pull requests, where this policy will be enforced.
>> >
>> > Which option do you prefer?
>> All these options include at least partial usage of/switch to github pr's.
>> I don't think that was discussed before. (FWIW i'm opposed to that.)
>>
>> Is there a fourth option - ask github whether they could make an exception
>> for LLVM to use server-side hooks? They are available in github
>> enterprise.
>>
>> > -Tom
>> Roman.
>>
>> > [1] http://lists.llvm.org/pipermail/llvm-dev/2019-January/129723.html
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