pre-revprop-change
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## Name

pre-revprop-change — Notification of a revision property change attempt.

## Description

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 nonzero exit value, no change to the property will be made, and anything printed to `stderr` is marshalled back to the client.

## Input parameter(s)

The command-line arguments passed to the hook program, in order, are:

1. Repository path

2. Revision whose property is about to be modified

3. Authenticated username attempting the property change

4. Name of the property changed

5. Change description: `A` (added), `D` (deleted), or `M` (modified)

Additionally, Subversion passes the intended new value of the property to the hook program via standard input.

## Common uses

Access control; change validation and control

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