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+#!/bin/sh

+

+# PRE-REVPROP-CHANGE HOOK

+#

+# The pre-revprop-change hook is invoked before a revision property

+# is added, modified or deleted.  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)

+#   [5] ACTION       (the property is being 'A'dded, 'M'odified, or 'D'eleted)

+#

+#   [STDIN] PROPVAL  ** the new 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.

+#

+# The hook program typically does not inherit the environment of

+# its parent process.  For example, a common problem is for the

+# PATH environment variable to not be set to its usual value, so

+# that subprograms fail to launch unless invoked via absolute path.

+# If you're having unexpected problems with a hook program, the

+# culprit may be unusual (or missing) environment variables.

+# 

+# Here is an example hook script, for a Unix /bin/sh interpreter.

+# For more examples and pre-written hooks, see those in

+# the Subversion repository at

+# http://svn.apache.org/repos/asf/subversion/trunk/tools/hook-scripts/ and

+# http://svn.apache.org/repos/asf/subversion/trunk/contrib/hook-scripts/

+

+

+REPOS="$1"

+REV="$2"

+USER="$3"

+PROPNAME="$4"

+ACTION="$5"

+

+if [ "$ACTION" = "M" -a "$PROPNAME" = "svn:log" ]; then exit 0; fi

+

+echo "Changing revision properties other than svn:log is prohibited" >&2

+exit 1