Make more tests pass on Windows.

tests/local_rietveld.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Setups a local Rietveld instance to test against a live server for
 integration tests.
 
 It makes sure Google AppEngine SDK is found, download Rietveld and Django code
 if necessary and starts the server on a free inbound TCP port.
@@ skipping 53 matching lines @@
     if not os.path.isfile(self.dev_app):
       raise Failure('Install google_appengine sdk in %s' % self.sdk_path)
 
     # Second, checkout rietveld if not available.
     if not os.path.isdir(self.rietveld):
       print('Checking out rietveld...')
       try:
         subprocess2.check_call(
             ['svn', 'co', '-q', 'http://rietveld.googlecode.com/svn/trunk@681',
              self.rietveld])
-      except subprocess2.CalledProcessError:
-        raise Failure('Failed to checkout rietveld')
+      except (OSError, subprocess2.CalledProcessError), e:
+        raise Failure('Failed to checkout rietveld\n%s' % e)
     else:
       print('Syncing rietveld...')
       try:
         subprocess2.check_call(
             ['svn', 'up', '-q', '-r', '681'], cwd=self.rietveld)
-      except subprocess2.CalledProcessError:
-        raise Failure('Failed to checkout rietveld')
+      except (OSError, subprocess2.CalledProcessError), e:
+        raise Failure('Failed to sync rietveld\n%s' % e)
 
   def start_server(self, verbose=False):
     self.install_prerequisites()
     self.port = find_free_port()
     if verbose:
       pipe = None
     else:
       pipe = subprocess2.VOID
     cmd = [
+        sys.executable,
         self.dev_app,
         '--skip_sdk_update_check',
         '.',
         '--port=%d' % self.port,
         '--datastore_path=' + os.path.join(self.rietveld, 'tmp.db'),
         '-c']
     self.test_server = subprocess2.Popen(
         cmd, stdout=pipe, stderr=pipe, cwd=self.rietveld)
     # Loop until port 127.0.0.1:port opens or the process dies.
     while not test_port(self.port):
@@ skipping 23 matching lines @@
     instance.start_server(verbose=options.verbose)
     print 'Local rietveld instance started on port %d' % instance.port
     while True:
       time.sleep(0.1)
   finally:
     instance.stop_server()
 
 
 if __name__ == '__main__':
   main()