Check whether the file exists before cleaning it up.

build/android/emulator.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.
 
 """Provides an interface to start and stop Android emulator.
 
 Assumes system environment ANDROID_NDK_ROOT has been set.
 
   Emulator: The class provides the methods to launch/shutdown the emulator with
@@ skipping 128 matching lines @@
   def _AggressiveImageCleanup(self):
     """Aggressive cleanup of emulator images.
 
     Experimentally it looks like our current emulator use on the bot
     leaves image files around in /tmp/android-$USER.  If a "random"
     name gets reused, we choke with a 'File exists' error.
     TODO(jrg): is there a less hacky way to accomplish the same goal?
     """
     logging.info('Aggressive Image Cleanup')
     emulator_imagedir = '/tmp/android-%s' % os.environ['USER']
+    if not os.path.exists(emulator_imagedir):
+      return
     for image in os.listdir(emulator_imagedir):
       full_name = os.path.join(emulator_imagedir, image)
       if 'emulator' in full_name:
         logging.info('Deleting emulator image %s', full_name)
         os.unlink(full_name)
 
   def _ConfirmLaunch(self, wait_for_boot=False):
     """Confirm the emulator launched properly.
 
     Loop on a wait-for-device with a very small timeout.  On each
@@ skipping 51 matching lines @@
     """Install a handler to kill the emulator when we exit unexpectedly."""
     for sig in self._SIGNALS:
       signal.signal(sig, self._ShutdownOnSignal)
 
 def main(argv):
   Emulator().launch()
 
 
 if __name__ == '__main__':
   main(sys.argv)