[LLVMdev] Howdy + GIT

[Bruce Hoult]

Once you enforce a linear master branch by requiring only "git merge
--no-ff", it's easy enough for a commit hook to add a monotonic tag to each
commit. They're very lightweight.

Yes, someone needs to write the five lines of code to do that, but that's
what you get when you use a SCM construction kit instead of a
one-size-fits-all solution.

Incidentally, about splitting submodules out. NOOOOOOOOOO!

I checked out out the all in one https://github.com/chapuni/llvm-project.git
repository. It took 2 minutes (to New Zealand) and the resulting .git
directory is 581 MB. For the entire history of everything! That's utterly
trivial. Less than a dollar worth of fast SSD, or maybe three cents of
spinning rust.

Why would you want to split that up and lose atomic commits and bisect
across different parts?

On Sat, Jan 17, 2015 at 3:31 PM, Tim Northover <t.p.northover at gmail.com>
wrote:

> > Even though git could be used in the same way as svn, why migrate just to
> > re-create the current workflow? Doesn't make too much sense to me. A
> > migration to git would have to include some other benefit, not just be
> > change for the sake of it.
>
> I think our routine workflow suffers quite a bit from the svn
> emphasis. Sending text patches is all very well from a portability
> point, but it makes applying someone else's commits rather annoying
> (particularly for commit, but even for testing):
>
> 1. Download the patch.
> 2. Remember where you put it (~/Downloads, ~, ~/Documents -- depends
> on exactly what program downloaded it) and what the name of the file
> was.
> 3. Either look or randomly guess what -pN you need to apply it.
> 4. Check things.
> 5. Open the blasted file again to recover the commit message
> (frequently weirdly indented because that's what "git show" produces).
> Or make one up.
> 6. Commit with that via copy/paste.
> 7. Hope you didn't forget to "git/svn add" the new test before committing.
>
> This is all you can do in svn (as far as I'm aware), but it's
> something git has solutions for. Some unified "git fetch" available
> for this would be very useful for example, even if we do decide a
> world without monotonic numbers is too scary for us.
>
> Tim.
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