pre-revprop-change — Notification of a revision property change attempt.
The pre-revprop-change hook is run immediately prior to the modification of a revision property when performed outside the scope of a normal commit. Unlike the other hooks, the default state of this one is to deny the proposed action. The hook must actually exist and return a zero exit value before a revision property modification can happen.
If the pre-revprop-change hook doesn't exist, isn't executable, or returns a non-zero exit value, no change to the property will be made, and anything printed to stderr is marshalled back to the client.
The command-line arguments passed to the hook program, in order, are:
revision whose property is about to be modified
authenticated username attempting the propchange
name of the property changed
D (deleted), or
Additionally, Subversion passes to the hook program via standard input the proposed value of the property.