MacPorts Trac source browser is broken

[Joshua Root]

<https://trac.macports.org/browser> just gives a page saying "Trac
Error". Links from wiki pages to source browser pages (revisions,
changelogs and so on) have "Couldn't open Subversion repository
/var/svn/macports: SubversionException: (&#34;Can't open file
'/var/svn/macports/format': Permission denied&#34" as their title text.

- Josh