GAMMA/PyGamma Version Management

GAMMA and PyGamma necessarily share the same version number, although they follow very different release strategies. This document describes how we manage versioning and releasing GAMMA and PyGamma.


All parts of GAMMA/PyGamma (Makefiles, Python code, etc.) get their version number from one source – the file [browser:trunk/VERSION gamma/VERSION].

PyGamma Drives the Versioning…

The Vespa project is really only interested in PyGamma since that's what Vespa needs to run. PyGamma is GAMMA plus a wrapper and an installer, so it's possible for PyGamma to change while GAMMA remains the same. (This was the case for the 4.2.1 release.) In this case, the GAMMA version number changes even though nothing has changed about GAMMA.

…But GAMMA Drives PyGamma

Despite the fact that PyGamma drives the versioning, we can still use version numbers to mark significant changes in GAMMA. PyGamma can't exist without GAMMA, so any significant change to GAMMA would result in a new version of PyGamma anyway.

This combination allows us to release new PyGamma versions without waiting for a change to GAMMA, while ensuring that changes to GAMMA are reflected in PyGamma.

GAMMA Releases

Currently and for the foreseeable future, the only way to get GAMMA is via SVN. That being the case, anyone who gets GAMMA and has questions about it can always report the SVN version to us. We don't really have GAMMA releases. Changes are applied continuously to trunk.

PyGamma Releases

PyGamma releases are more formal since we provide prebuilt binaries for them.

PyGamma gets its version number from GAMMA (specifically, from the file gamma/VERSION. When we release a new version of PyGamma, we're also "releasing" a new version of GAMMA, since the two share their version file.

When we release a new version of PyGamma, all of the prebuilt binaries we provide have to be rebuilt even if GAMMA hasn't changed. Rebuilding the binaries is necessary because they embed the GAMMA version number.

How to Release a New Version of PyGamma

  1. Update gamma/VERSION and gamma/NEWS. Update VERSION before you build since the version number gets embedded in the build output.
  2. Build a wheel for each of [PyGammaHowToBuildWheelsForWindows Windows], [PyGammaHowToBuildWheelsForOsx OS X], and [PyGammaHowToBuildWheelsForLinux Linux].
  3. Commit the VERSION file and NEWS files.
  4. Create an SVN tag for the release with a command like this:
     svn copy           \
            -m "TAG COMMENT GOES HERE."

    For example:

     svn copy           \
            -m "Tagging for 4.2.1 release."
  5. Let PyPI know that the package has changed –
     python register 
  6. [PyGammaHowToUploadWheels Upload the wheel files].
  7. You might want to announce the new version on the Vespa MRSHub Forum.