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Adding converted blog posts from old blog.
author Brian Neal <bgneal@gmail.com>
date Thu, 30 Jan 2014 21:45:03 -0600
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1 Upgrading Trac on Windows Gotcha - Part 2
2 #########################################
3
4 :date: 2012-03-21 20:10
5 :tags: Python, Trac, Subversion, Windows
6 :slug: upgrading-trac-on-windows-gotcha-part-2
7 :author: Brian Neal
8
9 I have `previously reported`_ on some problems I had when upgrading our Trac_
10 install at work. Today I attempted another upgrade to Subversion_ 1.7.4 and Trac
11 0.12.3 on Windows. I upgraded to Python_ 2.7.2 along the way. I ran into another
12 problem with the Python bindings to Subversion which took a while to figure out.
13 I had no problems upgrading Subversion, but Trac could not see our repository.
14 The symptoms were that the Trac "timeline" and "browse source" features were
15 missing.
16
17 Following the `Trac troubleshooting advice`_, I opened an interactive Python
18 session and tried this:
19
20 ::
21
22 E:\Trac_Data>python
23 Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win
24 32
25 Type "help", "copyright", "credits" or "license" for more information.
26 >>> from svn import client
27 Traceback (most recent call last):
28 File "<stdin>", line 1, in <module>
29 File "C:\Python27\lib\site-packages\svn\client.py", line 26, in <module>
30 from libsvn.client import *
31 File "C:\Python27\lib\site-packages\libsvn\client.py", line 25, in <module>
32 _client = swig_import_helper()
33 File "C:\Python27\lib\site-packages\libsvn\client.py", line 21, in swig_import
34 _helper
35 _mod = imp.load_module('_client', fp, pathname, description)
36 ImportError: DLL load failed: The operating system cannot run %1
37
38 After some head scratching and googling I finally found the problem. I had used
39 the Windows .msi installer, `graciously provided by Alagazam`_, aka David Darj,
40 to install Subversion. This placed the Subversion binaries and DLL's in
41 ``C:\Program Files\Subversion\bin``. I then unzipped the Python 2.7 bindings to
42 the ``C:\Python27\Lib\site-packages`` folder. The bindings depend on the DLL's
43 in the ``Subversion\bin`` folder. But unfortunately for me, there were already
44 two older versions of the DLL's, ``libeay32.dll`` and ``ssleay32.dll`` on my
45 path. So when the bindings went looking for those two DLL's, instead of finding
46 them in ``Subversion\bin``, it found the older versions somewhere else.
47
48 To fix this, you can either rearrange your path, or copy those two DLL's to your
49 ``Python27\Lib\site-packages\libsvn`` folder. In the future, I am going to just
50 copy all the DLL's from ``Subversion\bin`` to the ``libsvn`` folder.
51
52 I examined the pre-built Subversion packages from Bitnami_ and CollabNet_. They
53 had packaged all of the Subversion DLL's with the Python bindings together in
54 the same directory, so this seems reasonable. Later, on the Subversion users'
55 mailing list, Alagazam gave the nod to this approach.
56
57 A big thank you to Alagazam for the help and for the Windows binaries. And of
58 course thanks to the Apache_, Subversion_, Trac_, & Python_ teams for making
59 great tools.
60
61 .. _previously reported: /2011/09/12/upgrading-trac-on-windows-gotchas
62 .. _Trac: http://trac.edgewall.org/
63 .. _Subversion: http://subversion.apache.org/
64 .. _Trac troubleshooting advice: http://trac.edgewall.org/wiki/TracSubversion#Checklist
65 .. _graciously provided by Alagazam: http://sourceforge.net/projects/win32svn/
66 .. _Bitnami: http://bitnami.org/
67 .. _CollabNet: http://www.collab.net/
68 .. _Python: http://www.python.org/
69 .. _Apache: http://subversion.apache.org/