pre-revprop-change — Notification of a revision property change attempt.
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.
doesn't exist, isn't executable, or returns a nonzero exit
value, no change to the property will be made, and anything
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 property change
Name of the property changed
Additionally, Subversion passes the intended new value of the property to the hook program via standard input.