Fix the windows auto update scripts.

bootstrap/win/win_tools.bat

 @echo off
 :: Copyright (c) 2009 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
 
 :: This script will try to find if svn and python are accessible and it not,
 :: it will try to download it and 'install' it in depot_tools.
 
-SETLOCAL
+:: Sadly, we can't use SETLOCAL here otherwise it ERRORLEVEL is not correctly
+:: returned.
 
-set ROOT_URL=http://src.chromium.org/svn/trunk/tools
-set ROOT_DIR=%~dp0..\..
+set WIN_TOOLS_ROOT_URL=http://src.chromium.org/svn/trunk/tools
+set WIN_TOOLS_ROOT_DIR=%~dp0..\..
 
+:SVN_CHECK
 :: If the batch file exists, skip the svn check.
-if exist "%ROOT_DIR%\svn.bat" goto :PYTHON
+if exist "%WIN_TOOLS_ROOT_DIR%\svn.bat" goto :PYTHON_CHECK
 call svn --version 2>nul 1>nul
-if errorlevel 1 call :C_SVN
-
-:PYTHON
-:: If the batch file exists, skip the python check.
-if exist "%ROOT_DIR%\python.bat" goto :EOF
-call python --version 2>nul 1>nul
-if errorlevel 1 call :C_PYTHON
-
-:: We are done.
-goto :EOF
+if errorlevel 1 goto :SVN_INSTALL
+goto :PYTHON_CHECK
 
 
-:C_SVN
+:SVN_INSTALL
 echo Installing subversion ...
 :: svn is not accessible; check it out and create 'proxy' files.
-call "%~dp0wget" -q %ROOT_URL%/third_party/svn.7z -O "%~dp0svn.7z"
+if exist "%~dp0svn.7z" del "%~dp0svn.7z"
+call "%~dp0wget" -q %WIN_TOOLS_ROOT_URL%/third_party/svn_win_client.7z -O "%~dp0svn.7z"
 if errorlevel 1 goto :SVN_FAIL
-call "%~dp07za" x "%~dp0svn.7z" %ROOT_DIR%
+echo call "%~dp07za" x -y "%~dp0svn.7z" -o"%WIN_TOOLS_ROOT_DIR%" 1>nul
+call "%~dp07za" x -y "%~dp0svn.7z" -o"%WIN_TOOLS_ROOT_DIR%" 1>nul
 if errorlevel 1 goto :SVN_FAIL
+if not exist "%WIN_TOOLS_ROOT_DIR%\svn\." goto :SVN_FAIL
 del "%~dp0svn.7z"
 :: Create the batch file.
-copy "%~dp0svn.bat" "%ROOT_DIR%"
-goto :EOF
+call copy /y "%~dp0svn.bat" "%WIN_TOOLS_ROOT_DIR%\svn.bat" 1>nul
+goto :PYTHON_CHECK
 
 
 :SVN_FAIL
-echo Failed to checkout svn automatically.
+echo ... Failed to checkout svn automatically.
 echo Please visit http://subversion.tigris.org to download the latest subversion client
 echo before continuing.
-echo You can also get the "prebacked" version used at %ROOT_URL%/third_party/
-:: Still try python.
-goto :C_PYTHON
+echo You can also get the "prebacked" version used at %WIN_TOOLS_ROOT_URL%/third_party/
+set ERRORLEVEL=1
+goto :END
 
 
-:C_PYTHON
+:PYTHON_CHECK
+:: If the batch file exists, skip the python check.
+set ERRORLEVEL=0
+if exist "%WIN_TOOLS_ROOT_DIR%\python.bat" goto :END
+call python --version 2>nul 1>nul
+if errorlevel 1 goto :PYTHON_INSTALL
+
+:: We are done.
+set ERRORLEVEL=0
+goto :END
+
+
+:PYTHON_INSTALL
 echo Installing python ...
-call svn co %ROOT_URL%/third_party/python "%ROOT_DIR%\python"
+call svn co -q %WIN_TOOLS_ROOT_URL%/third_party/python "%WIN_TOOLS_ROOT_DIR%\python"
 if errorlevel 1 goto :PYTHON_FAIL
 :: Create the batch file.
-copy "%~dp0python.bat" "%ROOT_DIR%"
-goto :EOF
+call copy /y "%~dp0python.bat" "%WIN_TOOLS_ROOT_DIR%\python.bat" 1>nul
+set ERRORLEVEL=0
+goto :END
 
 
 :PYTHON_FAIL
-echo Failed to checkout python automatically.
+echo ... Failed to checkout python automatically.
 echo Please visit http://python.org to download the latest python 2.x client before
 echo continuing.
-echo You can also get the "prebacked" version used at %ROOT_URL%/third_party/
-goto :EOF
+echo You can also get the "prebacked" version used at %WIN_TOOLS_ROOT_URL%/third_party/
+set ERRORLEVEL=1
+goto :END
+
+
+:returncode
+set WIN_TOOLS_ROOT_URL=
+set WIN_TOOLS_ROOT_DIR=
+exit /b %ERRORLEVEL%
+
+:END
+call :returncode %ERRORLEVEL%