On Tue, Oct 19, 2010 at 11:59 AM, Steve Langasek steve.langasek@linaro.org wrote:

Hi Xianghua,

On Tue, Oct 19, 2010 at 11:24:16AM -0500, Xianghua Xiao wrote:

...

I'm new here and have a dumb question: why is linaro using bzr while nearly the whole linux-related projects are either using or switching to git?

This is a frequently repeated idea, but I think it's an exaggeration.  It's true that git is popular, but both CVS and subversion are still widely used for many projects, and both bzr and mercurial are continuing to grow in use. Proponents of git tend to repeat this idea that "everyone will soon be using git".  Many of these proponents are kernel developers; from their perspective, it often seems that everyone is *already* using git.  :)

And unfortunately there isn't much survey data to tell us what the real market share (or mind share) of the different VCSes is; but at least one attempt at finding data shows that bzr usage is growing much faster than git usage:

http://bazaarvcs.wordpress.com/2010/02/15/bazaar-adoption-growing-strongly/

Now, to answer your real question. :)  Linaro uses bzr in large part because Linaro uses Launchpad, and Launchpad integrates with bzr (and it does not integrate with git).  Some of us on the Linaro team also have a personal preference for bzr, so this works out nicely for us - but it's not something that we're religious about.  For collaborating with certain upstream projects, such as the kernel and u-boot, it's clear that using git is the appropriate choice; that's why we have git.linaro.org.  For new work in Linaro, such as our platform and infrastructure tools, bzr is the better choice because of the integration with Launchpad.

Cheers,

Steve Langasek                   Give me a lever long enough and a Free OS Debian Developer                   to set it on, and I can move the world. Ubuntu Developer                                    http://www.debian.org/ slangasek@ubuntu.com                                     vorlon@debian.org

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Steve, Thanks for the reply. I do think git is outreaching to non-kernel-uboot world, in that meego, openembedded,android,etc,etc are all using git for a large number of packages. Anyway guess I will learn yet another SCM tool.

Xianghua

On Tue, 19 Oct 2010, Steve Langasek wrote:

Now, to answer your real question. :) Linaro uses bzr in large part because Linaro uses Launchpad, and Launchpad integrates with bzr (and it does not integrate with git). Some of us on the Linaro team also have a personal preference for bzr, so this works out nicely for us - but it's not something that we're religious about. For collaborating with certain upstream projects, such as the kernel and u-boot, it's clear that using git is the appropriate choice; that's why we have git.linaro.org. For new work in Linaro, such as our platform and infrastructure tools, bzr is the better choice because of the integration with Launchpad.

I can't resist... but to say that I'm looking forward to the work being done on the git-bzr interface for Git to interact with bzr repos directly.

Nicolas (a happy Git user and developer.) Pitre