trac and mercurial integration using in-process hook

[Jan Capek]

Hi,

I am not sure whether this is more of a devel question or user support 
question.

My question is on integrating an existing trac hack to adjust trac tickets 
referenced by a particular changeset (the hook is based on 
http://trac-hacks.org/browser/timingandestimationplugin/branches/trac0.10/scripts/trac-post-commit.py 
and in fact uses it as submodule)

I would like to use the this as a commit/incoming in-process python hook 
(see the code 
at the bottom). However, I ran into module import problems since 
mercurial seems to redefine the 'import' built-in function. The trace is 
attached below. This issue seems to be similar to 
http://www.selenic.com/mercurial/bts/issue605

Could the actual problem be in the following dependency which seems to be 
circular: ????