The official Apache Subversion FAQ entry applies to your case as far as I see ATM.
The new approach that allows you to filter repository history supposedly should help:
You can replicate the repository with svnsync
tool after configuring path-based authorization rules that deny read access to any paths that need to be filtered out from repository history.
Unlike svndumpfilter
, svnsync
will automatically translate copy operations with an unreadable source path into normal additions, which is useful if history involving copy operations needs to be filtered.
Also check this answer: https://stackoverflow.com/a/13720677/761095.