make subwcrev process more reliable

SubWCRev.bat

@@ -1,34 +1,43 @@
 @echo off
 
-set TEMPFILE="%TEMP%-%RANDOM%-%RANDOM%-%RANDOM%-%RANDOM%"
+set TEMPFILE="%TEMP%\BIZBUILD-SVN-%RANDOM%-%RANDOM%-%RANDOM%-%RANDOM%"
 set SVNREV="%~1properties\svnrev.cs"
 
-rem generate a wvnrev with sed using no revision number, in case svn isnt available
-@"%~1..\sed.exe" s/\$WCREV\$/0/ < "%~1properties\svnrev_template" > %TEMPFILE%
-
 rem try generating svnrev from svn now. this will fail if svn is nonexistent, so...
-@"%~1..\SubWCRev.exe" "%~1\.." "%~1properties\svnrev_template" %TEMPFILE% > nul
+"%~1..\SubWCRev.exe" "%~1\.." "%~1properties\svnrev_template" %TEMPFILE% > nul
+
+rem generate a svnrev with sed using no revision number, in case svn isnt available
+if not exist %TEMPFILE% (
+    "%~1..\sed.exe" s/\$WCREV\$/0/ < "%~1properties\svnrev_template" > %TEMPFILE%
+)
 
 rem ... ignore the error
 SET ERRORLEVEL=0
 
+
+
 rem if we didnt even have a svnrev, then go ahead and copy it
 if not exist %SVNREV% (
-   @copy /y %TEMPFILE% %SVNREV%
+   copy /y %TEMPFILE% %SVNREV%
 ) else if exist %TEMPFILE% (
   rem check to see whether its any different, so we dont touch unchanged files
   fc /b %TEMPFILE% %SVNREV% > nul
-  if %ERRORLEVEL% neq 0 (
-    echo Updated svnrev file
-	@copy /y %TEMPFILE% %SVNREV%
-  ) else (
+  if ERRORLEVEL 0 (
     echo Not touching unchanged svnrev file
   )
+  if ERRORLEVEL 1 (
+    echo Updated svnrev file
+    @copy /y %TEMPFILE% %SVNREV%
+  )
+  if ERRORLEVEL 2 (
+    echo Updated svnrev file
+    @copy /y %TEMPFILE% %SVNREV%
+  )
 ) else (
   echo Ran into a weird error writing subwcrev output to tempfile: %TEMPFILE%
 )
 
-del %TEMPFILE%
+rem del %TEMPFILE%
 
 rem always let build proceed
 SET ERRORLEVEL=0