SVNで既にコミットされているバージョンのコメントには、「管理者にpre-revprop-changeフックを作成してください」というメッセージが表示されます.

@ECHO OFF    
:: Set all parameters. Even though most are not used, in case you want to add    
:: changes that allow, for example, editing of the author or addition of log messages.    
set repository=%1    
set revision=%2    
set userName=%3    
set propertyName=%4    
set action=%5    
    
:: Only allow the log message to be changed, but not author, etc.    
if /I not "%propertyName%" == "svn:log" goto ERROR_PROPNAME    
    
:: Only allow modification of a log message, not addition or deletion.    
if /I not "%action%" == "M" goto ERROR_ACTION        
:: Make sure that the new svn:log message is not empty.    
set bIsEmpty=true    
for /f "tokens=*" %%g in ('find /V ""') do (    
set bIsEmpty=false    
)    
if "%bIsEmpty%" == "true" goto ERROR_EMPTY    
   
goto :eof    
    
:ERROR_EMPTY    
echo Empty svn:log messages are not allowed. >&2    
goto ERROR_EXIT    
   
:ERROR_PROPNAME    
echo Only changes to svn:log messages are allowed. >&2    
goto ERROR_EXIT    
    
:ERROR_ACTION    
echo Only modifications to svn:log revision properties are allowed. >&2    
goto ERROR_EXIT    
   
:ERROR_EXIT    
exit /b 1