Per directory read/write permissions in Mercurial

I would like to convert my Subversion repository to Mercurial. I have a pretty big web project divided into many different folders. In Subversion I was able to set per directory permissions for a repository. For example, I could say that a new developer could only read and write a subset of all the project's directories, using Subversion's path-based authorization. I could "hide" certain directories containing sensitive parts of the code from the deve开发者_如何学JAVAloper, so that he wouldn't be able to see their contents, nor commit any changes to them.

Is it possible to have a similar setup in a single Mercurial repository?

You might try the ACL extension which is provided with Mercurial.