[eigen] git

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We're considering moving to Git (or another DVCS).

The motivation is that lately there's been an increasing number of
people doing experiments around Eigen, and so far we haven't found a
way of making Eigen's SVN really friendly to that. There are 2 types
of problems:
a) one only asks for a KDE SVN account if one knows one'll keep
contributing in the future. But many people just want to be able to do
experiments with Eigen, code a potential new module, without making
that kind of commitment right away.
b) SVN is not as friendly as a DCVS for doing experiments and letting
other people use the code without commiting to the central repository.

We created the unsupported/ directory where we can add stuff without
being worried about maintainance, but that didn't solve the above

I don't know much about Git or DVCS's in general but my impression is
that it makes it easier to create your own branch of Eigen and then
let other people use it. I also believe that git is far more clever
than SVN at merging different branches. I would be interested in links
explaining how this is the case... or proving me wrong.

All this means moving out of the KDE tree (even if KDE moves to git in
the future that wouldn't solve a)).
But at the moment we have KDE trunk that relies on Eigen trunk. So in
order to keep things convenient for KDE, we could, in the short term,
keep a copy of eigen in kdesupport, where it is now, and update it
from time to time by re-syncing with the git repo (any pointer
appreciated as to best practice to do that).
As soon as Eigen 2.1 is released and distros have packages, we'll tell
people to use that. As, in the future, KDE will track eigen
development less closely, we'll be able to remove the copy in

I absolutely want to preserve 100% of the SVN commit history across
this change. I was told this is possible and a friend offered to do
the move for us.

a) Git or Mercurial or another DVCS? Here like elsewhere, I expect git
to be the most popular, but I don't have any opinions of my own as I'm
very ignorant in these matters. From IRC and mail I received several
"votes" for git and 1 for mercurial.
b) Where to look for hosting? I heard that github is nice and offers
useful features. The alternative would be tuxfamily which offers plain
git repos, but certainly not with the same fancy features.
c) Any good git tutorial you'd especially recommend? especially
regarding dealing with different branches ?


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