[llvm-dev] [RFC] One or many git repositories?

Justin Bogner via llvm-dev llvm-dev at lists.llvm.org
Wed Jul 27 12:23:55 PDT 2016

Jonathan Roelofs <jonathan at codesourcery.com> writes:
> On 7/27/16 12:30 PM, Justin Bogner via llvm-dev wrote:
>> Justin Lebar via llvm-dev <llvm-dev at lists.llvm.org> writes:
>>> Maybe I am wrong.  But I don't think we're going to get to the bottom
>>> of it without actually engaging with people who are actually affected
>>> in the way you posit.
>> Well, I'm one of those people. I'm still convinced that, for me,
>> switching to a monorepo is a few weeks or maybe a couple of months of
>> disruption to my life[1] and we end up in a state that isn't any better,
>> just arbitrarily different.
>> [1]: re-cloning tens of repos across a few machines and migrating
>>      branches from them, adjusting my workflow to deal with the new
>>      layout, blowing away all of my existing build trees, arguing about
>>      how to handle legacy branches that now need to merge between a
>>      multi-repo layout and a monorepo layout, asking people to update
>>      bot configs, figuring out how the downstream clones of
>>      clang-without-llvm that I have to deal with will work, etc).
> Would this be mitigated for you if the existing git mirrors continued
> to work as-is, with their history at some point coming from the
> monorepo instead of from git-svn?
> (i.e. use a monorepo, but re-construct the commits to the individual
> git repositories with some cron job, or hooks, or otherwise)

That will make migrating less urgent, which is good. However, you
wouldn't actually be able to commit from those repos - any commits will
have the wrong hashes. I suspect I'd need to migrate away from them

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