Disable incremental install with isolated processes for Android L+

build/android/incremental_install/installer.py

 #!/usr/bin/env python
 #
 # Copyright 2015 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.
 
 """Install *_incremental.apk targets as well as their dependent files."""
 
 import argparse
 import glob
@@ skipping 103 matching lines @@
         device_dex_dir = posixpath.join(device_incremental_dir, 'dex')
         # Ensure no two files have the same name.
         transformed_names = _TransformDexPaths(dex_files)
         for src_path, dest_name in zip(dex_files, transformed_names):
           shutil.copyfile(src_path, os.path.join(temp_dir, dest_name))
         device.PushChangedFiles([(temp_dir, device_dex_dir)],
                                 delete_device_stale=True)
       push_dex_timer.Stop(log=False)
 
   def check_selinux():
-    # Samsung started using SELinux before Marshmallow. There may be even more
-    # cases where this is required...
-    has_selinux = (device.build_version_sdk >= version_codes.MARSHMALLOW or
-                   device.GetProp('selinux.policy_version'))
+    # Marshmallow has no filesystem access whatsoever. It might be possible to
+    # get things working on Lollipop, but attempts so far have failed.
+    # http://crbug.com/558818
+    has_selinux = device.build_version_sdk >= version_codes.LOLLIPOP
     if has_selinux and apk.HasIsolatedProcesses():
-      raise Exception('Cannot use incremental installs on versions of Android '
-                      'where isoloated processes cannot access the filesystem '
-                      '(this includes Android M+, and Samsung L+) without '
+      raise Exception('Cannot use incremental installs on Android L+ without '
                       'first disabling isoloated processes.\n'
                       'To do so, use GN arg:\n'
                       '    disable_incremental_isolated_processes=true')
 
   cache_path = '%s/files-cache.json' % device_incremental_dir
   def restore_cache():
     if not enable_device_cache:
       logging.info('Ignoring device cache')
       return
     # Delete the cached file so that any exceptions cause the next attempt
@@ skipping 116 matching lines @@
   if args.uninstall:
     Uninstall(device, apk.GetPackageName())
   else:
     Install(device, apk, split_globs=args.splits, lib_dir=args.lib_dir,
             dex_files=args.dex_files, enable_device_cache=args.cache,
             use_concurrency=args.threading)
 
 
 if __name__ == '__main__':
   sys.exit(main())