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Since Subversion aims to be the successor to CVS, it only makes sense to provide tools to help that migration. Subversion has a script that migrates data from a CVS repository to a Subversion repository. Yes, you can take your CVS history with you into the brave new world.
The tool is called cvs2svn.py, and it's a python script that lives within Subversion's source tree in the tools subdirectory. In order to run this program, you need a number of external things:
Make sure you have python 2.0 or later installed. You can get the latest from http://www.python.org/.
This is a python module for parsing RCS files, and is part of the ViewCVS project. It's needed to read your CVS repository. For convenience, a copy is provided in the same directory as cvs2svn.py, although a more recent version may be available from the ViewCVS project— http://viewcvs.sf.net/.. Simply drop this module into a place where python can find it, somewhere like /usr/local/lib/python2.2/.
The SWIG-generated python bindings to the Subversion libraries must be installed. In particular, cvs2svn.py needs to make calls into libsvn_fs so it can commit data into a Subversion repository. (See the section called “Using Languages Other than C and C++”.)