[Android] Make gyp/apk_install.py resilient to user actions

build/android/gyp/apk_install.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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.
 
 """Installs an APK.
 
 """
 
 import optparse
 import os
+import re
 import subprocess
 import sys
 
 from util import build_utils
 from util import md5_check
 
 BUILD_ANDROID_DIR = os.path.join(os.path.dirname(__file__), '..')
 sys.path.append(BUILD_ANDROID_DIR)
 
 from pylib import android_commands
+from pylib.utils import apk_helper
+
+
+def GetMetadata(apk_package):
+  """Gets the metadata on the device for the apk_package apk."""
+  adb = android_commands.AndroidCommands()
+  output = adb.RunShellCommand('ls -l /data/app/')
+  # Matches lines like:
+  # -rw-r--r-- system   system    7376582 2013-04-19 16:34 org.chromium.chrome.testshell.apk
+  # -rw-r--r-- system   system    7376582 2013-04-19 16:34 org.chromium.chrome.testshell-1.apk
+  apk_matcher = lambda s: re.match('.*%s(-[0-9]*)?.apk$' % apk_package, s)
+  matches = filter(apk_matcher, output)
+  return matches[0] if matches else None
+
+
+def HasInstallMetadataChanged(apk_package, metadata_path):
+  """Checks if the metadata on the device for apk_package has changed."""
+  if not os.path.exists(metadata_path):
+    return True
+
+  with open(metadata_path, 'r') as expected_file:
+    return expected_file.read() != GetMetadata(apk_package)
+
+
+def RecordInstallMetadata(apk_package, metadata_path):
+  """Records the metadata from the device for apk_package."""
+  metadata = GetMetadata(apk_package)
+  if not metadata:
+    raise 'APK install failed unexpectedly.'
+
+  with open(metadata_path, 'w') as outfile:
+    outfile.write(metadata)
+
 
 def main(argv):
   parser = optparse.OptionParser()
   parser.add_option('--android-sdk-tools',
       help='Path to Android SDK tools.')
   parser.add_option('--apk-path',
       help='Path to .apk to install.')
   parser.add_option('--install-record',
       help='Path to install record (touched only when APK is installed).')
   parser.add_option('--stamp',
       help='Path to touch on success.')
   options, _ = parser.parse_args()
 
   # TODO(cjhopman): Should this install to all devices/be configurable?
   install_cmd = [
       os.path.join(options.android_sdk_tools, 'adb'),
       'install', '-r',
       options.apk_path]
 
+  serial_number = android_commands.AndroidCommands().Adb().GetSerialNumber()
+  apk_package = apk_helper.GetPackageName(options.apk_path)
+
+  metadata_path = '%s.%s.device.time.stamp' % (options.apk_path, serial_number)
+
+  # If the APK on the device does not match the one that was last installed by
+  # the build, then the APK has to be installed (regardless of the md5 record).
+  force_install = HasInstallMetadataChanged(apk_package, metadata_path)
+
   def Install():
-      build_utils.CheckCallDie(install_cmd)
-      build_utils.Touch(options.install_record)
+    build_utils.CheckCallDie(install_cmd)
+    RecordInstallMetadata(apk_package, metadata_path)
+    build_utils.Touch(options.install_record)
 
-  serial_number = android_commands.AndroidCommands().Adb().GetSerialNumber()
+
   record_path = '%s.%s.md5.stamp' % (options.apk_path, serial_number)
   md5_check.CallAndRecordIfStale(
       Install,
       record_path=record_path,
       input_paths=[options.apk_path],
-      input_strings=install_cmd)
+      input_strings=install_cmd,
+      force=force_install)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))