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#!/bin/sh
# PRE-REVPROP-CHANGE HOOK
#
# The pre-revprop-change hook is invoked before a revision property
# is modified. Subversion runs this hook by invoking a program
# (script, executable, binary, etc.) named 'pre-revprop-change' (for which
# this file is a template), with the following ordered arguments:
#
# [1] REPOS-PATH (the path to this repository)
# [2] REVISION (the revision being tweaked)
# [3] USER (the username of the person tweaking the property)
# [4] PROPNAME (the property being set on the revision)
#
# [STDIN] PROPVAL ** the property value is passed via STDIN.
#
# If the hook program exits with success, the propchange happens; but
# if it exits with failure (non-zero), the propchange doesn't happen.
# The hook program can use the 'svnlook' utility to examine the
# existing value of the revision property.
#
# WARNING: unlike other hooks, this hook MUST exist for revision
# properties to be changed. If the hook does not exist, Subversion
# will behave as if the hook were present, but failed. The reason
# for this is that revision properties are UNVERSIONED, meaning that
# a successful propchange is destructive; the old value is gone
# forever. We recommend the hook back up the old value somewhere.
#
# On a Unix system, the normal procedure is to have 'pre-revprop-change'
# invoke other programs to do the real work, though it may do the
# work itself too.
#
# Note that 'pre-revprop-change' must be executable by the user(s) who will
# invoke it (typically the user httpd runs as), and that user must
# have filesystem-level permission to access the repository.
#
# On a Windows system, you should name the hook program
# 'pre-revprop-change.bat' or 'pre-revprop-change.exe',
# but the basic idea is the same.
#
# Here is an example hook script, for a Unix /bin/sh interpreter:
REPOS="$1"
REV="$2"
USER="$3"
PROPNAME="$4"
if [ "$PROPNAME" = "svn:log" ]; then exit 0; fi
exit 1
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