On 03/18/2011 10:40 AM, Vincent Massol wrote:
> Hi everyone,
>
> I'd like test the waters and see what you'd feel about moving XWiki's source 
> to GitHub.
>
> Pros:
> * Use Git instead of Subversion. Which means a better SCM especially wrt 
> branching / diagnosins bugs (bissect) just to name 2

Offline commits, and offline (and faster and more powerful) access to 
the full commit history are very important in my opinion.

> * More contributors since it's easy to fork/branch and we can see 
> contributor's patches (pull requests) and apply them way more easily than 
> with subversion

+ more visibility/recognition for the contributors, since they are 
preserved as the authors.

> * More collaboration in general between committers and contributors
> * A better SCM web site (check github.com - offers graphs/stats, views of 
> forked/branched repos, etc)

I wouldn't call it a better SCM site, since other tools offer nice views 
of the repository. But it is a better source *collaboration* site since 
it shows forks/branches/pulls very nicely.

> * Good buzz for us (tech marketing)
> * GitHub provides SVN integration (see 
> https://github.com/blog/644-subversion-write-support) which means we can 
> continue using SVN tools such as svnsearch, ohloh, our IDE integrations, etc

svnsearch won't be that needed since git/github offer many of those 
tools natively, but the graphs from svnsearch are easier to obtain and 
show live.

IDE integrations should work just as well (if not better) with Git.

> * Less admin work and less maintenance since this is handled by GitHub itself
> * Good uptime on GitHub (probably at least as good as ours if not better)
> * Improved developer spirit since most devs wants to start using Git

+1, I've been doing this for a couple of years already and I'm happy 
with the experience.

* POM changes for the new repository configuration.

> Cons:
> * Have to learn a new SCM/new tools
> * No integration of users with xwiki.org

Do you mean that access rights should be defined in xwiki.org as it is 
now, with the CommittersGroup? I guess that's not possible.

> * Import/reorg work to be done obviously

I already started doing that, I should find some time to finish 
importing applications and plugins. Before doing the final switch I 
should re-synchronize with the svn repository.

Should the contrib repository be imported as well?

One problem is that the default size limit is for 300M of data, and 
we're already approaching that limit (thanks to the early non-maven days 
when we bundled all the jars in our repo). I think that if we request 
it, we'll be granted more space for free, as an open source project.

> * Reliance on an external provider (but seen the other OSS projects there I'm 
> not worried and there's no lock in since your have the repos spread on all 
> users' machines)

Yep, a lot of big names are moving there.

> IMO the pros heavily outweight the cons.
>
> WDYT?

+1.

And replying to your other mail, +1 for doing it after the 3.0 release, 
but as soon as possible after that, so that we can get familiar with it 
and iron out any quirks before the 3.1M1 release.

We should write a GitApp, similar to the SvnApp, which works directly 
with a git repository.

-- 
Sergiu Dumitriu
http://purl.org/net/sergiu/
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