cvs-buildpackage - 5.26+nmu1 main

This package provides the capability to inject or import Debian
source packages into a CVS repository, build a Debian package from
the CVS repository, and helps in integrating upstream changes into
the repository.
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The import or inject process takes a dsc (Debian source control)
file, and imports it into CVS. The module path can maintains
distribution and section information; for example, one may inject
hemm/hemm/devel/make into the repository.
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The build process works analogously to dpkg-buildpackage, and can be
used from within the checked out source tree, or with additional
information, can be used from anywhere. In the latter case, you can
build any previous version of the package, as long as the
corresponding orig.tar.gz file is still around. The build script
checks out the relevant version from the CVS repository, and runs
dpkg-buildpackage to create the Debian package.
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Combined, these utilities provide an infrastructure to facilitate the
use of CVS by Debian maintainers. This allows one to keep separate
CVS branches of a package for stable, unstable, and possibly
experimental distributions, along with the other benefits of a
version control system.
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This can be used to generate a unified CVS source tree, for example.