[Project-managers] Git and github

[Matthew Saltzman]

I don't think we can force all projects to move, but it looks like
SubGit is a fairly effective mirroring technology.  It looks like there
will be some issues, and yes, whichever repo is your primary, the other
one will be somewhat limited.  Projects that we can move by TLC action
or in collaboration with PMs, we can consider switching to Git as the
primary repo.

I'm not an experienced Git user (yet!), so I'm still trying to get my
head around SubGit, but we should be able to play with it on a couple of
repos pretty soon.  Anyone want to suggest a couple of guinea pig repos?

On Tue, 2014-05-13 at 20:43 +0200, Tobias Achterberg wrote: 
> Just my 2 cents:
> 
> In my view, git is very much superior to svn, mostly because of its ability to 
> work with branches and to do offline development. This is particularly true for 
> projects that have multiple developers. Yes, it is different and switching from 
> svn to git will cost you two or three weeks of rewiring your brain, but it is 
> definitely worth it.
> 
> Using svn-git mirroring will most likely severely cripple many of the git 
> benefits. There is (as far as I know) just no way of mapping git branch/merge 
> histories to svn, and one would always need to rebase (i.e., linearize) the git 
> history before one can apply it to svn. Pretty painful.
> 
> So, my suggestion would be to switch completely to git. We did this a few years 
> ago with CPLEX and everybody there feels that this was a very good move as it 
> dramatically improved the way code development and version control is used.
> After I joined Gurobi, switching from svn to git was basically the first thing 
> that we did, and again people start to like it. In both cases switching and 
> learning to master git was not that painful.
> 
> But if you want to keep svn for whatever reason, I guess you should then stay 
> with it and not try to get into the git world on some crippled mirroring path.
> 
> 
> Cheers,
> 
> Tobias
> 
> 
> On 05/13/14 16:51, Ted Ralphs wrote:
> > Dear project managers,
> >
> > Recently, there have been a number of requests to support git an an alternative
> > to subversion and, in particular, to allow projects to be hosted and managed on
> > github. As such, I have established a github organization for COIN-OR
> >
> > https://github.com/coin-or
> >
> > and we are currently hosting a few projects there as a test. We have been
> > discussing this on the TLC and the board and our current thought is that all
> > projects would continue to have a presence on TRAC and would probably have their
> > repos mirrored onto COIN (this is easy with git). We now have the capability of
> > hosting projects with git on the COIN server using TRAC, i.e., you can add a git
> > repo and browse the source just as you can with subversion.
> >
> > For a number of reasons, it would probably be good for COIN to have a bigger
> > presence on github---this is the current GOTO host for open source projects
> > these days and it has a lot of nice features. However, I realize not everyone
> > wants to switch to git. We are considering setting up two-way mirroring between
> > subversion and git using a package called subgit that seems to do a pretty good
> > job of this. There are some interesting challenges in doing the
> > mapping---philosphically, git and subversion are very different--but it does a
> > pretty good job of it.
> >
> > So, the questions are:
> >
> > 1. How many of you would be interested in switching to managing your project
> > with git if you had the chance?
> >
> > 2. Would you object to the mirroring of your project to github for any reason?
> >
> > I'd appreciate your feedback when you get the chance. It will be difficult to
> > make this work without support from project managers.
> >
> > Cheers,
> >
> > Ted
> > --
> > Dr. Ted Ralphs
> > Associate Professor, Lehigh University
> > (610) 628-1280
> > ted 'at' lehigh 'dot' edu
> > coral.ie.lehigh.edu/~ted <http://coral.ie.lehigh.edu/~ted>
> >
> >
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> > Project-managers at list.coin-or.org
> > http://list.coin-or.org/mailman/listinfo/project-managers
> >
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-- 
Matthew Saltzman
Clemson University Math Sciences
mjs AT clemson DOT edu