Summary: Fixes T10941. This avoids a confusing dead end when configuring Subversion hosting, where `svnserve` will fail to execute hooks if the CWD isn't readable by the vcs-user.
Test Plan:
- Updated and committed in a hosted SVN repository.
- Ran some git operations, too.
- @dpotter confirmed this locally in T10941.
Reviewers: chad
Reviewed By: chad
Subscribers: dpotter
Maniphest Tasks: T10941
Differential Revision: https://secure.phabricator.com/D15879