I upgraded a test server to FreeBSD 6.3 (released a few days ago) and all was working well apart from my TurboGears app. I run a TurboGears instance behind mod_wsgi and it wouldn't start. Here is the error I got in http_errors.log
[Sat Jan 19 11:32:42 2008] [error] [client 207.155.93.149] mod_wsgi (pid=1292): Exception occurred within WSGI script '/home/m/release1.0/apache/turbogears.wsgi'.
[Sat Jan 19 11:32:42 2008] [error] [client 207.155.93.149] Traceback (most recent call last):
[Sat Jan 19 11:32:42 2008] [error] [client 207.155.93.149] File "/home/m/release1.0/apache/turbogears.wsgi", line 67, in <module>
[Sat Jan 19 11:32:42 2008] [error] [client 207.155.93.149] import turbogears
[Sat Jan 19 11:32:42 2008] [error] [client 207.155.93.149] ImportError: No module named turbogears
That's odd. I've not uninstalled TurboGears and my background processes that #import TurboGears still work. Infact if I go to the python command line and type #import TurboGears it all works... bugger.
To complicate matters (in this case) I use a workingenv to contain a very specific version of TurboGears and all of it's dependencies. In order for the wsgi script to access the sandbox environment I use an excellent script which tweaks the runtime environment to include the paths in a working env. My first though is that something here had gone wrong. So I turned to prints and some basic error capture.
# Load all distributions into the working set.
from pkg_resources import working_set, Environment
env = Environment(root)
env.scan()
distributions, errors = working_set.find_plugins(env)
for dist in distributions:
working_set.add(dist)
Printing out errors revealed:
errors:
{Amara 1.2.0.2 (/usr/home/m/tgenv1_0_32/lib/python2.5/Amara-1.2.0.2-py2.5.egg):
DistributionNotFound(Requirement.parse('4Suite-XML>=1.0.2'),),
TGCaptcha 0.11 (/usr/home/m/tgenv1_0_32/lib/python2.5/TGCaptcha-0.11-py2.5.egg):
DistributionNotFound(Requirement.parse('pycrypto>=2.0.1'),)}
Well I hadn't uninstalled those packages and I'm pretty sure that freebsd-update hadn't uninstalled them so where the hell have they gone! Looking in the workingenv sandbox package directory
ls -la /usr/home/m/tgenv1_0_32/lib/python2.5
4Suite_XML-1.0.2-py2.5-freebsd-6.2-RELEASE-i386.egg
Amara-1.2.0.2-py2.5.egg
BeautifulSoup-3.0.5-py2.5.egg
Cheetah-2.0.1-py2.5-freebsd-6.2-RELEASE-i386.egg
Cheetah-2.0rc8-py2.5-freebsd-6.2-RELEASE-i386.egg
CherryPy-2.2.1-py2.5.egg
...
PasteScript-1.3.6-py2.5.egg
PyProtocols-1.0a0dev_r2302-py2.5-freebsd-6.2-RELEASE-i386.egg
Routes-1.7.1-py2.5.egg
RuleDispatch-0.5a0.dev_r2306-py2.5-freebsd-6.2-RELEASE-i386.egg
SQLAlchemy-0.3.10-py2.5.egg
...
moved_aside_site.py
psycopg2-2.0.6-py2.5-freebsd-6.2-RELEASE-i386.egg
pycrypto-2.0.1-py2.5-freebsd-6.2-RELEASE-i386.egg
python_dateutil-1.3-py2.5.egg
...
setuptools.pth
simplejson-1.7.3-py2.5-freebsd-6.2-RELEASE-i386.egg
...
BUGGER, there are packages in there with the OS version number in that need to be updated:
easy_install -U amara
easy_install -U pycrypto
easy_install -U psycopg2
...
fixed all the problems and finally the site is up again 
So I've fixed the problem but I don't know why my other processes and the python command line worked. If anyone knows, I love to know too. Cheers.
