@echo off
set SVNLOOK="C:\Program Files\VisualSVN\bin\svnlook.exe"
setlocal
set REPOS=%1
set TXN=%2
rem check that logmessage contains at least 10 characters
%SVNLOOK% log "%REPOS%" -t "%TXN%" | findstr ".........." > nul
if %errorlevel% gtr 0 goto err
exit 0
:err
echo Empty log message not allowed. Commit aborted! 1>&2
exit 1

@ECHO OFF 
set repos=%1 
set rev=%2 
set user=%3 
set propname=%4 
set action=%5 
  
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: Only allow changes to svn:log. The author, date and other revision 
:: properties cannot be changed 
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
if /I not '%propname%'=='svn:log' goto ERROR_PROPNAME 
  
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: Only allow modifications to svn:log (no addition/overwrite or deletion) 
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
if /I not '%action%'=='M' goto ERROR_ACTION 
  
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: Make sure that the new svn:log message contains some text. 
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
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 properties are not allowed. >&2 
goto ERROR_EXIT 
  
:ERROR_PROPNAME 
echo Only changes to svn:log revision properties 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