This trac plugin adds a link to the repository in the source browser.

For an example of how it works, go to the following link and then
click on "Repo" in the context navigation:

http://zoo.weinigel.se/trac/public/browser/trac/repolink/trunk

To activate the link you have to tell the plugin where the repository
resides, for example, if the repository is reachable via http:

[trac]
repository_url=http://svn.edgewall.com/repos/trac/