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1 Upgrading Trac on Windows Gotcha - Part 2
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2 #########################################
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3
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4 :date: 2012-03-21 20:10
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5 :tags: Python, Trac, Subversion, Windows
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6 :slug: upgrading-trac-on-windows-gotcha-part-2
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7 :author: Brian Neal
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8
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9 I have `previously reported`_ on some problems I had when upgrading our Trac_
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10 install at work. Today I attempted another upgrade to Subversion_ 1.7.4 and Trac
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11 0.12.3 on Windows. I upgraded to Python_ 2.7.2 along the way. I ran into another
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12 problem with the Python bindings to Subversion which took a while to figure out.
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13 I had no problems upgrading Subversion, but Trac could not see our repository.
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14 The symptoms were that the Trac "timeline" and "browse source" features were
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15 missing.
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16
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17 Following the `Trac troubleshooting advice`_, I opened an interactive Python
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18 session and tried this:
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19
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20 ::
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21
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22 E:\Trac_Data>python
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23 Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win
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24 32
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25 Type "help", "copyright", "credits" or "license" for more information.
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26 >>> from svn import client
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27 Traceback (most recent call last):
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28 File "<stdin>", line 1, in <module>
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29 File "C:\Python27\lib\site-packages\svn\client.py", line 26, in <module>
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30 from libsvn.client import *
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31 File "C:\Python27\lib\site-packages\libsvn\client.py", line 25, in <module>
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32 _client = swig_import_helper()
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33 File "C:\Python27\lib\site-packages\libsvn\client.py", line 21, in swig_import
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34 _helper
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35 _mod = imp.load_module('_client', fp, pathname, description)
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36 ImportError: DLL load failed: The operating system cannot run %1
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37
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38 After some head scratching and googling I finally found the problem. I had used
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39 the Windows .msi installer, `graciously provided by Alagazam`_, aka David Darj,
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40 to install Subversion. This placed the Subversion binaries and DLL's in
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41 ``C:\Program Files\Subversion\bin``. I then unzipped the Python 2.7 bindings to
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42 the ``C:\Python27\Lib\site-packages`` folder. The bindings depend on the DLL's
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43 in the ``Subversion\bin`` folder. But unfortunately for me, there were already
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44 two older versions of the DLL's, ``libeay32.dll`` and ``ssleay32.dll`` on my
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45 path. So when the bindings went looking for those two DLL's, instead of finding
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46 them in ``Subversion\bin``, it found the older versions somewhere else.
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47
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48 To fix this, you can either rearrange your path, or copy those two DLL's to your
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49 ``Python27\Lib\site-packages\libsvn`` folder. In the future, I am going to just
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50 copy all the DLL's from ``Subversion\bin`` to the ``libsvn`` folder.
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51
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52 I examined the pre-built Subversion packages from Bitnami_ and CollabNet_. They
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53 had packaged all of the Subversion DLL's with the Python bindings together in
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54 the same directory, so this seems reasonable. Later, on the Subversion users'
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55 mailing list, Alagazam gave the nod to this approach.
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56
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57 A big thank you to Alagazam for the help and for the Windows binaries. And of
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58 course thanks to the Apache_, Subversion_, Trac_, & Python_ teams for making
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59 great tools.
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60
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61 .. _previously reported: /2011/09/12/upgrading-trac-on-windows-gotchas
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62 .. _Trac: http://trac.edgewall.org/
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63 .. _Subversion: http://subversion.apache.org/
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64 .. _Trac troubleshooting advice: http://trac.edgewall.org/wiki/TracSubversion#Checklist
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65 .. _graciously provided by Alagazam: http://sourceforge.net/projects/win32svn/
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66 .. _Bitnami: http://bitnami.org/
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67 .. _CollabNet: http://www.collab.net/
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68 .. _Python: http://www.python.org/
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69 .. _Apache: http://subversion.apache.org/
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