Android emulator image cleanup.

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 96 matching lines @@
     """Return our device name."""
     port = _GetAvailablePort()
     return ('emulator-%d' % port, port)
 
   def Launch(self):
     """Launches the emulator and waits for package manager to startup.
 
     If fails, an exception will be raised.
     """
     _KillAllEmulators()  # just to be sure
+    self._AggressiveImageCleanup()
     (self.device, port) = self._DeviceName()
     emulator_command = [
         self.emulator,
         # Speed up emulator launch by 40%.  Really.
         '-no-boot-anim',
         # The default /data size is 64M.
         # That's not enough for 4 unit test bundles and their data.
         '-partition-size', '256',
         # ALWAYS wipe the data.  We've seen cases where an emulator
         # gets 'stuck' if we don't do this (every thousand runs or
         # so).
         '-wipe-data',
         # Use a familiar name and port.
         '-avd', 'buildbot',
         '-port', str(port)]
     logging.info('Emulator launch command: %s', ' '.join(emulator_command))
     self.popen = subprocess.Popen(args=emulator_command,
                                   stderr=subprocess.STDOUT)
     self._InstallKillHandler()
     self._ConfirmLaunch()
 
+  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']
+    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
     timeout, check the emulator process is still alive.
     After confirming a wait-for-device can be successful, make sure
     it returns the right answer.
     """
     a = android_commands.AndroidCommands(self.device, False)
     seconds_waited = 0
@@ skipping 45 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)