Mercurial (hg) is the default. It was chosen for a distributed SCM (DSCM) solution and is recommended for projects/consolidations currently using a distributed development model and/or TeamWare.
 
Subversion (SVN) is provided for exceptions. It was chosen for a centralized solution for individual projects and consolidations that have a requirement to use SVN or centralized source code management.

Background information:

See the OpenSolaris SCM Project History page for information about the process utilized to evaluate and choose SCM solutions for the site.
See the requirements document for detail about OpenSolaris development requirements.

See the specifications about this work for implementation information:
SCM implementation specification
SCM console specification

Help/Getting Started

General Subversion support is available on the website. A Beta testing period for Mercurial support started on October 18th.

In addition to the Subversion and Mercurial websites:

OpenSolaris SVN help page
OpenSolaris Mercurial help page

Binaries and Source Available
Binaries and source for Subversion and Mercurial can be found on the SCM Downloads page.  The tarballs will be updated and maintained over time to ensure up-to-date versions are available.

Timeline
The target for starting a Mercurial Beta is 10/18/06.  At that time, a Mercurial help page and an ON Consolidation test repository will be available.

Check the SCM milestones for other milestones and information.

Tools
Some consolidations and projects have tools that have knowledge of the underlying SCM system.

The SCM Migration Project is working to make these tools understand Mercurial and possibly SVN as well. It is also looking at additional tools that might be helpful to teams moving to Mercurial. Get involved. If you do, the work will go faster.
http://opensolaris.org/os/community/tools/scm/

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