[llvm-dev] Renaming The Default Branch

Mon Nov 16 18:00:23 PST 2020

This timing actually is likely to be more convenient for my downstreams, as most of the devs will be away.That way we can ‘ease’ into our transition with a limited number of devs being affected by it…

That said, from a downstream-perspective, it looks like we’ll still be keeping ‘master’ updated for a while, right?
> We will lock the master branch and change it to be readonly (with the exception of llvmbot)

Is that what I should take from that?

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Stephen Hines via llvm-dev
Sent: Monday, November 16, 2020 5:14 PM
To: Mehdi AMINI <joker.eph at gmail.com>
Cc: llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Renaming The Default Branch

I'm very supportive of this switch, but I do think that the timing leaves a bit to be desired. Many people will be taking time off for the holidays at the end of the year, and forcing a change to be complete by week 1 of the new year (since January 7 is part of our first work-week in 2021), might make things more difficult than they should be. This is also problematic because lots of organizations might be subject to production freezes during this time, so they won't be able to do as much testing as they would want before having to switch over. Could we perhaps push back the end date by 2-4 weeks to ensure that nobody has to work through the holidays and/or have an extra stressful first work-week of 2021?

Thanks,
Steve

On Fri, Nov 13, 2020 at 5:10 PM Mehdi AMINI via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:

On Fri, Nov 13, 2020 at 4:53 PM James Y Knight via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
I notice that on https://github.com/github/renaming it says:

"""If you haven’t renamed your default branch yet, consider waiting until later this year<https://github.com/github/renaming#later-this-year>. We’re investing in tools to make renaming the default branch of an existing repository a seamless experience for both maintainers and contributors."""

Is that not relevant/not useful for us to wait for that?

They expand on this at the end of the document: https://github.com/github/renaming#later-this-year-seamless-move-for-existing-repositories-
None of the items seemed particularly helpful. The main feature I'd have wanted would have a server side mirroring of main to master, but we can emulate this with a github action (as Mike plans to do).

--
Mehdi

On Fri, Nov 13, 2020, 6:57 PM Mike Edwards via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
Hi Everyone,
Many tech communities, including GitHub<https://github.com/github/renaming> and Git<https://sfconservancy.org/news/2020/jun/23/gitbranchname/>, have moved away from term “master branch” and replaced it with “main branch” in an
effort to remove unnecessary references to slavery and use more inclusive terms.  This was also discussed on the LLVM-dev mailing list<https://lists.llvm.org/pipermail/llvm-dev/2020-June/142445.html>
and there was strong consensus from LLVM Developers’ that the LLVM Project should also rename our master branch as well. Now that
an industry standard name has been selected by GitHub, the LLVM Project can begin the renaming process of the default branch to “main”.

This change will occur at **06:00GMT on Monday December 7, 2020** (time is **GMT**, please adjust for your local timezone).

To make this as easy as possible we plan to do the following prior to November 20, 2020:
* Create a new branch named 'test-main' on the llvm-project repository
    * This branch will be read-only except for the llvmbot account
    * Setup a GitHub action to mirror commits from 'master' to ‘test-main' automatically
    * Allow the configuration to soak for a few days to ensure everything works
* Create a new branch named “main” on the llvm-project repository
    * This branch will be readonly initially
    * Reuse the previous Github Action to mirror master to main
    * This configuration will stay in place until cutover takes place on Dec. 7

On December 7, 2020:
* We will lock the master branch and change it to be readonly (with the exception of llvmbot)
* Switch the GitHub action to mirror commits from the new main branch back to the old master branch
* Make a few test commits to ensure the GitHub action is functioning as expected
* Open the main branch to commits from community members
* In parallel we will begin to work through the rest of the llvm organization repositories to update branch names as well
* We will update the developer policy to reflect the change in workflow

On January 7, 2021:
* We will remove the ‘master’ branch from all repositories in the llvm organization

As we work towards December 7, 2020 we are going to set up a test of this system on a fork of the llvm-project
in order to simulate the cutover. If we encounter any issues we will update the community on llvm-dev.
We expect the llvm-project repository to be unavailable to developers for approximately 1 hour while the
switch is made. Lockout will occur promptly at 06:00GMT on the 7th. Certainly if we finish sooner, we will
update llvm-dev to let everyone know the repository is available for use once again.

We know this has been a long process and we want to thank everyone for their patience.  We look forward to getting
the project completed soon.

Respectfully,

Mike Edwards
On Behalf Of the LLVM Foundation
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