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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] REV          (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.

#

# The default working directory for the invocation is undefined, so

# the program should set one explicitly if it cares.

#

# 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 runs in an empty environment, unless the server is

# explicitly configured otherwise.  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.

#

# CAUTION:

# For security reasons, you MUST always properly quote arguments when

# you use them, as those arguments could contain whitespace or other

# problematic characters. Additionally, you should delimit the list

# of options with "--" before passing the arguments, so malicious

# clients cannot bootleg unexpected options to the commands your

# script aims to execute.

# For similar reasons, you should also add a trailing @ to URLs which

# are passed to SVN commands accepting URLs with peg revisions.

#

# 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