trac.web.modpython_frontend Application error

[David H.]

After updateing my trac from 0.11.7 to 1.0.1 and genshi to 0.6 trac comes up no more. I receive a "500 Internal Server Error". For security reason I had to blank out server names. As I cannot find anything to be incorrect I think it's a bug in in the combination of versions and "trac.web.modpython_frontend".

I did:

:~# apache2 -v
Server version: Apache/2.2.14 (Ubuntu)
Server built:   Nov  6 2012 20:40:54
:~#python --version
Python 2.6.5
:~#easy_install Trac==1.0.1
:~#easy_install Genshi

The "500 Internal Server Error":

:~#tail -f /var/log/apache2/ssl_error.log
[Fri Feb 15 08:24:57 2013] [error] mod_python (pid=24880, interpreter='***', phase='PythonHandler', handler='trac.web.modpython_frontend'): Application error
[Fri Feb 15 08:24:57 2013] [error] ServerName: '***'
[Fri Feb 15 08:24:57 2013] [error] DocumentRoot: '/var/www'
[Fri Feb 15 08:24:57 2013] [error] URI: '/trac/os/'
[Fri Feb 15 08:24:57 2013] [error] Location: '/trac/os'
[Fri Feb 15 08:24:57 2013] [error] Directory: None
[Fri Feb 15 08:24:57 2013] [error] Filename: '/var/home/database/trac/os/wiki/'
[Fri Feb 15 08:24:57 2013] [error] PathInfo: ''
[Fri Feb 15 08:24:57 2013] [error] Traceback (most recent call last):
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/lib/python2.6/dist-packages/mod_python/importer.py", line 1537, in HandlerDispatch\n    default=default_handler, arg=req, silent=hlist.silent)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/lib/python2.6/dist-packages/mod_python/importer.py", line 1229, in _process_target\n    result = _execute_target(config, req, object, arg)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/lib/python2.6/dist-packages/mod_python/importer.py", line 1128, in _execute_target\n    result = object(arg)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/web/modpython_frontend.py", line 148, in handler\n    gateway.run(dispatch_request)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/web/wsgi.py", line 91, in run\n    response = application(self.environ, self._start_response)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/web/main.py", line 438, in dispatch_request\n    env = open_environment(env_path, use_cache=not run_once)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/env.py", line 842, in open_environment\n    env = env_cache.setdefault(env_path, open_environment(env_path))
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/env.py", line 846, in open_environment\n    env = Environment(env_path)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/core.py", line 124, in __call__\n    self.__init__(*args, **kwargs)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/env.py", line 284, in __init__\n    self.setup_config()
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/env.py", line 611, in setup_config\n    load_components(self, plugins_dir and (plugins_dir,))
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/loader.py", line 114, in load_components\n    loadfunc(env, search_path, auto_enable=plugins_dir)
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg/trac/loader.py", line 90, in _load_py_files\n    module = imp.load_source(plugin_name, plugin_file)
[Fri Feb 15 08:24:57 2013] [error]   File "/var/home/database/trac/os/wiki/plugins/setup.py", line 29, in <module>\n    install_requires = [ 'Trac >= 0.11' ]
[Fri Feb 15 08:24:57 2013] [error]   File "/usr/lib/python2.6/distutils/core.py", line 140, in setup\n    raise SystemExit, gen_usage(dist.script_name) + "\\nerror: %s" % msg
[Fri Feb 15 08:24:57 2013] [error] SystemExit: usage: mod_python [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]\n   or: mod_python --help [cmd1 cmd2 ...]\n   or: mod_python --help-commands\n   or: mod_python cmd --help\n\nerror: no commands supplied

So I checked Genshi integration and that alls paths are correct:

Python 2.6.5 (r265:79063, Oct  1 2012, 22:04:36) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import genshi
>>> import sys
>>> sys.path
['', '/usr/local/lib/python2.6/dist-packages/TracWysiwyg-0.11.0.4-py2.6.egg', '/usr/local/lib/python2.6/dist-packages/TracWikiToPdfPlugin-2.3.1dev-py2.6.egg', '/usr/local/lib/python2.6/dist-packages/Genshi-0.6-py2.6.egg', '/usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/lib/python2.6/dist-packages', '/usr/lib/pymodules/python2.6', '/usr/lib/pymodules/python2.6/gtk-2.0', '/usr/local/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages']
>>> 

Then I checked that all *.eggs are available:

:~# ls -la /usr/local/lib/python2.6/dist-packages/
total 472
drwxrwsr-x 9 root staff   4096 2013-02-13 14:47 .
drwxrwsr-x 4 root staff   4096 2012-11-08 13:56 ..
-rw-r--r-- 1 root staff    305 2013-02-13 10:07 easy-install.pth
drwxr-sr-x 4 root staff   4096 2013-02-13 10:07 Genshi-0.6-py2.6.egg
drwxr-sr-x 2 root staff   4096 2011-09-14 16:03 pywbem
-rw-r--r-- 1 root staff    299 2011-09-14 16:03 pywbem-0.7.0.egg-info
-rw-r--r-- 1 root staff     33 2012-06-18 13:04 setuptools.pth
drwxr-sr-x 5 root staff   4096 2013-02-13 10:07 Trac-1.0.1-py2.6.egg
drwxr-sr-x 4 root staff   4096 2012-06-18 13:04 TracWikiToPdfPlugin-2.3.1dev-py2.6.egg
drwxr-sr-x 4 root staff   4096 2011-08-25 17:43 TracWysiwyg-0.11.0.3-py2.6.egg
drwxr-sr-x 4 root staff   4096 2012-06-19 12:00 TracWysiwyg-0.11.0.4-py2.6.egg

I tried to reinstall all the packages:

:~# easy_install Trac
Searching for Trac
Best match: Trac 1.0.1
Processing Trac-1.0.1-py2.6.egg
Trac 1.0.1 is already the active version in easy-install.pth
Installing trac-admin script to /usr/local/bin
Installing tracd script to /usr/local/bin
Using /usr/local/lib/python2.6/dist-packages/Trac-1.0.1-py2.6.egg
Processing dependencies for Trac
Finished processing dependencies for Trac

:~#easy_install Genshi
Searching for Genshi
Best match: Genshi 0.6
Processing Genshi-0.6-py2.6.egg
Genshi 0.6 is already the active version in easy-install.pth
Using /usr/local/lib/python2.6/dist-packages/Genshi-0.6-py2.6.egg
Processing dependencies for Genshi
Finished processing dependencies for Genshi

[Christian Boos]

From that line:

 "/var/home/database/trac/os/wiki/plugins/setup.py", line 29, in <module>\n
 install_requires = [ 'Trac >= 0.11' ]

1. try without that plugin (TracWysiwyg it seems), see if it then works
2. nevertheless, I think that such a requre "Trac ≥ 0.11" should pass…

[Remy Blank]

This looks like a version mixup. Please make sure you have removed all traces of the 0.11.x install.

Also, this is an InstallationIssue. You will get more help on the MailingList and IrcChannel.

[David H.]

try without that plugin (TracWysiwyg? it seems), see if it then works

Thanks! I didn't had an eye on this. Awfully it did not help. The error remains the same.

After torturing g00gle for hours it seems to be easyer setting up a stable 0.11.7 on a new system then try to find the reason for this error. But nevertheless trac is great. Thanks

[anonymous]

Maybe it's a chance to go one step back. So how can I safely remove the installation of trac 1.0.1?

[David H.]

This is no version mixup as I found out. If I try to resync my env I got:

Failed to open environment. [Errno 2] No such file or directory: '/var/home/database/trac/os/VERSION'

Correct path should be the following. This path is wrong after updating trac from 0.11.7 to 1.0.1. Before I updated the path was:

/var/home/database/trac/os/wiki/VERSION

This is the only thing wrong. So I try to fixed that somehow. Any help is appreciated.

[David H.]

Got it working now. Here are the few steps from all the ones I've testet that worked: 00 making a backup of your env 01 remove/deinstall/purge everything concerning trac 1.0.1 an 0.11.7 using easy_install -m apt-get remove purge etc. 02 apt-get install sqlite3 03 easy_install trac=1.0.1 04 creating a completely new environment with the "initenv" command using a different folder 05 copying all the folders and files from beneath …/wiki/ to the new environment ../wiki/ starting with 06 giving correct permissions to the /path/to/your/env