On 10/10/2019 03:50 PM, Mehdi AMINI wrote:
> 
> 
> On Thu, Oct 10, 2019 at 1:14 PM Jordan Rupprecht <ruppre...@google.com 
> <mailto:ruppre...@google.com>> wrote:
> 
> 
> 
>     On Thu, Oct 10, 2019 at 12:29 PM Tom Stellard via llvm-dev 
> <llvm-...@lists.llvm.org <mailto:llvm-...@lists.llvm.org>> wrote:
> 
>         On 10/10/2019 11:40 AM, Mehdi AMINI wrote:
>         >
>         >
>         > On Thu, Oct 10, 2019 at 10:59 AM Tom Stellard <tstel...@redhat.com 
> <mailto:tstel...@redhat.com> <mailto:tstel...@redhat.com 
> <mailto:tstel...@redhat.com>>> wrote:
>         >
>         >     On 10/09/2019 11:05 PM, Mehdi AMINI wrote:
>         >     >
>         >     >
>         >     > On Wed, Oct 9, 2019 at 10:16 PM Tom Stellard via cfe-dev 
> <cfe-...@lists.llvm.org <mailto:cfe-...@lists.llvm.org> 
> <mailto:cfe-...@lists.llvm.org <mailto:cfe-...@lists.llvm.org>> 
> <mailto:cfe-...@lists.llvm.org <mailto:cfe-...@lists.llvm.org> 
> <mailto:cfe-...@lists.llvm.org <mailto:cfe-...@lists.llvm.org>>>> wrote:
>         >     >
>         >     >     Hi,
>         >     >
>         >     >     We're less than 2 weeks away from the developer meeting, 
> so I wanted to
>         >     >     give an update on the GitHub migration and what's 
> (hopefully) going to
>         >     >     happen during the developer meeting.
>         >     >
>         >     >     Everyone who has added their information to the 
> github-usernames.txt
>         >     >     file in SVN before today should have received an invite 
> to become a collaborator
>         >     >     on the llvm-project repository.  If you did not receive 
> an invite and think
>         >     >     you should have, please contact me off-list.  I will 
> continue to monitor the
>         >     >     file for new updates and periodically send out new 
> batches of invites.
>         >     >
>         >     >     There is still some ongoing work to get the buildbots 
> ready and the mailing lists
>         >     >     ready, but we are optimistic that the work will be done 
> in time.
>         >     >
>         >     >     The team at GitHub has finished implementing the "Require 
> Linear History"
>         >     >     branch protection that we requested.  The feature is in 
> beta and currently
>         >     >     enabled in the llvm-project repository.  This means that 
> we will have the
>         >     >     option to commit directly via git, in addition to using 
> the git-llvm script.
>         >     >     A patch that updates git-llvm to push to git instead of 
> svn can be found here:
>         >     >     https://reviews.llvm.org/D67772.  You should be able to 
> test it out on your
>         >     >     own fork of the llvm-project repository.
>         >     >
>         >     >     The current plan is to begin the final migration steps on 
> the evening (PDT)
>         >     >     of October 21.  Here is what will happen:
>         >     >
>         >     >     1. Make SVN read-only.
>         >     >     2. Turn-off the SVN->git update process.
>         >     >     3. Commit the new git-llvm script directly to github.
>         >     >     4. Grant all contributors write access to the repository.
>         >     >
>         >     >
>         >     > Is the repo configured to forbid contributors to create new 
> branches? I'm worried about the "jungle" it can become quickly if we leave 
> open the possibility to create branches "at will" in the repo, I rather leave 
> this to maintainers.
>         >     >
>         >
>         >     I haven't been able to find a way to restrict branch creation 
> for committers,
>         >     I'm not sure if this is even possible.
>         >
>         >
>         > I think you can just go to the branch settings, add a new branch 
> protection rule, match on everything but master, and check "Restrict who can 
> push to matching branches".
>         >
> 
>         I tried this, and the branch protections only come into effect after 
> a branch
>         has been creating, so this doesn't prevent new branches.  It's 
> actually worse
>         than doing nothing, because once the branch is created the branch 
> protection
>         prevents you from deleting it.
> 
> 
> Ah, interesting :)
> Since for now `git-llvm` is necessary to push to the repo, I guess creating a 
> branch won't even really be possible? So when adding the support for branch 
> creation to `git-llvm` we could print a disclaimer about it or something?
> 

With my latest changes in https://reviews.llvm.org/D67772 it is actually 
possible
to create a new branch with git-llvm, so we could print a disclaimer or block 
this,
however we still can't stop people from creating a new branch using the
normal git command.

-Tom

> 
> 
>         -Tom
> 
> 
>     FWIW, we're interested in periodically (weekly) tagging 
> well-tested/stable revisions, but via a branch instead of just a tag so we 
> can include which cherrypicks (e.g. reverts or fixes) are needed. We do this 
> with the current svn repo so we'd just be porting existing functionality to 
> github.
> 
> 
> I would likely include this in the general category of "project maintainer" 
> created branch?
> The main difference with SVN, is that on GitHub a fork is "cheap" and 
> everyone can have their own. Also compared to SVN you don't really know ahead 
> of time when you type `git clone` or `git pull` that you may pull a lot of 
> noise.
> I'm not against branches for the sake of it, I just have some bad memories 
> from a repo where every developer was pushing their work in progress branches 
> all the time and they never got deleted: to the point where some git CLI 
> auto-completion was unusable (there were >10k branches and probably as many 
> tags).
>  
> 
> 
>     (Also, I'm not sure this announcement thread with all the *-dev lists is 
> the best place to discuss branching policy, but I wanted to get this bit in 
> since y'all brought it up :) )
> 
> 
> (we discussed branches in past GitHub migration thread, we just never had a 
> dedicated email thread to user-branches, as it didn't seem like there was a 
> strong need for it)
>  
> 
>      
> 
> 
>         > 
>         >
>         >     We could try to enforce this rule in the git-llvm script, but 
> this would
>         >     mean making use of the script mandatory, which was our original 
> plan, but
>         >     that was based on the assumption that the "Require Linear 
> History"
>         >     protection would not be ready in time.
>         >
>         >     Generally, would it be better if we kept use of the script 
> mandatory so that
>         >     we can handle this and other potential restrictions in the 
> future?
>         >
>         >     - Tom
>         >     >
>         >     >
>         >     >     5. Email lists announcing that the migration is complete.
>         >     >
>         >     >     Once the migration is complete, if you run into any 
> issues, please file
>         >     >     a bug, and mark it as a blocker for the github metabug 
> PR39393.
>         >     >
>         >     >     If you have any questions or think I am missing 
> something, please
>         >     >     let me know.
>         >     >
>         >     >
>         >     > This is fantastic! Thank you so much for doing this work Tom 
> :)
>         >     >
>         >     > --
>         >     > Mehdi
>         >     >
>         >     >
>         >
> 
>         _______________________________________________
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>         llvm-...@lists.llvm.org <mailto:llvm-...@lists.llvm.org>
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> 

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