Subversion Autodeploy post-commit Hook

Since the apache user is non-interactive, it's difficult to get a post-commit hook to trigger an svn update elsewhere on the system. You can either temporarily make the apache user interactive, or perform the checkout in the hook one time. For the latter option, empty the deployment directory and update the post-commit hook with this command...
svn checkout file:///path/to/svn/project/ /path/to/project/dev/deployment --non-interactive
Now make a trivial change and perform a commit. Check that the project has been deployed. Change the post-commit hook to this...
svn update /path/to/project/dev/deployment --non-interactive