how can I lock a branch in a Kallithea Hg repository?

[Todd Morgan]

Evening folks,
    I have a requirement to lock a branch in some of my mercurial
repositories - so that only a very small set of users can actually push to
the branch (eg the "develop" branch if using the git-flow model -
http://nvie.com/posts/a-successful-git-branching-model/ ).

Is this something that can be achieved in Kallithea? - without resorting to
forking the repository and having a separate integration repository?

Thanks
     Todd
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