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+Upgrading Trac on Windows Gotchas
+#################################
+
+:date: 2011-09-12 22:15
+:tags: Python, Trac, Subversion, Windows
+:slug: upgrading-trac-on-windows-gotchas
+:author: Brian Neal
+
+At work, we are outfitted with Windows servers. Despite this obstacle, I managed
+to install Trac_ and Subversion_ a few years ago. During a break in the action,
+we decided to update Subversion (SVN) and Trac. Since we are on Windows, this
+means we have to rely on the `kindness of strangers`_ for Subversion binaries. I
+ran into a couple of gotchas I'd like to document here to help anyone else who
+runs into these.
+
+I managed to get Subversion and Trac up and running without any real problems.
+However when Trac needed to access SVN to display changesets or a timeline, for
+example, I got an error:
+
+``tracerror: unsupported version control system "svn" no module named _fs``
+
+After some googling, I finally found that this issue is `documented on the Trac
+wiki`_, but it was kind of hard to find. To fix this problem, you have to rename
+the Python SVN binding's DLLs to ``*.pyd``. Specifically, change the 
+``libsvn/*.dll`` files to ``libsvn/*.pyd``, but don't change the name of 
+``libsvn_swig_py-1.dll``. I'd really like to hear an explanation of why one
+needs to do this. Why doesn't the Python-Windows build process do this for you?
+
+The second problem I ran into dealt with mod_wsgi_ on Windows. Originally, a few
+years ago, I setup Trac to run under mod_python_. mod_python has long been
+out of favor, so I decided to cut over to mod_wsgi. On my Linux boxes, I always
+run mod_wsgi in daemon mode. When I tried to configure this on Windows, Apache
+complained about an unknown directive ``WSGIDaemonProcess``. It turns out that
+`this mode is not supported on Windows`_. You'll have to use the embedded mode on
+Windows. 
+
+.. _Trac: http://trac.edgewall.org/
+.. _Subversion: http://subversion.apache.org/
+.. _kindness of strangers: http://sourceforge.net/projects/win32svn/
+.. _documented on the Trac wiki: http://trac.edgewall.org/wiki/TracSubversion
+.. _mod_wsgi: http://code.google.com/p/modwsgi/
+.. _mod_python: http://www.modpython.org/
+.. _this mode is not supported on Windows: http://code.google.com/p/modwsgi/wiki/ConfigurationDirectives#WSGIDaemonProcess