Summary:
See PHI24. If you create a hosted Mercurial repository and switch it to observed, you can end up with a hook installed that runs on pulls and complains.
Instead, just bail out if we're running on a pull.
The corresponding Git hook doesn't run on pulls, so there's no issue in Git.
Test Plan: Executed the hook in an observed Mercurial repository, got a clean exit.
Reviewers: chad
Reviewed By: chad
Differential Revision: https://secure.phabricator.com/D18307
03423c632c