I wanted to edit a log comment in the repository browser and received an error message that no pre-revprop-change hook exists for the repository. Besides having a scary name, what is a pre-revprop-change hook, and how do I create it?
Basically it's a script that is launched before unversioned property is modified on the repository, so that you can manage more precisely what's happening on your repository.
There are templates in the SVN distrib for different hooks, located in the /hooks subdirectory (*.tmpl that you have to edit and rename depending on your OS, to activate).