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Making a Trac install work on Apache 2.2/Python 2.6/win32

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I recently upgraded the systems to Python 2.6, and the worst part of that was getting Trac to work again.

This guide assumes you have a working install of Trac on Python 2.5/mod_python/Apache2.2 already, as described in the Trac install guide, and that Python 2.6 is installed.

What needs to be done:

  • Install Python 2.6 and Trac for 2.6
  • Build a new version of mod_python
  • Build a new version of libsvn
  • Replace Apache DLLs

Required software

You’ll need Visual C++ 2008 Express Edition or any retail version of VS 2008.

Preparing

Install Python 2.6 and Trac on 2.6 (using “ easy_install trac” is recommended)

You’ll probably also want to easy_install Pygments for source highlighting.

Building mod_python for 2.6

This guide to mod_python covers the creation and installation of a compatible version of the module.

At this point, you should be able to restart Apache and load up your “old” Trac on Python 2.6, but with the error message that “svn” support is not installed.

A pre-built version of this can be found here:  mod_python-3.3.2-dev-20080819.win32-py2.6.exe

Building svn/libsvn for Python 2.6

Follow my previous guide to compile and install Python SVN bindings.

At this point, if you restart Apache, your Trac will most likely throw an exception about “_mod” being undefined.

Replacing Apache DLLs to make libsvn work

There’s a slight difference between libapr-1.dll as supplied with Apache 2.2 and the one we built together with libsvn, so the fix is to replace the one in your Apache2.2\bin folder with the one you built yourself, and copying all the libsvn*.dll files you built in the previous step to the same folder.

Restarting Apache now should make Trac work fully, with Subversion support.

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Compiling Subversion Python bindings on Windows

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I tried finding good instructions on building the Python SVN bindings (for use with Trac), but the included readme file is based on Visual C++ 5.0/6.0 (which I remember using back in ’98), and leaves out a few crucial steps.

So, this how-to will explain the process of building SVN bindings for Python 2.6 on Windows.

What you’ll need:

  • Visual C++ 2008 Express Edition (Visual Studio 2008 will also work, but will base this on free downloads)
  • Swig (I used swigwin-1.3.39 specifically, but any newer version should do)
  • Subversion source – grab both the source file subversion-1.6.0.zip and the dependencies subversion-deps-1.6.0.zip

Preparing

Start with installing VC++ 2008 Express and Python if you haven’t already, then create a folder to store the source trees (I used C:\Temp – and will use that folder in the instructions here for simplicity). Unpack Swig to C:\Temp\swig, and subversion-1.6.0.zip and subversion-deps-1.6.0.zip to C:\Temp (which should create the folder “C:\Temp\subversion-1.6.0″).

Make sure you have C:\Python26 in your path.
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