tree 837337ecd52c40811f5af4ee8b2e41bab8766f13
parent f42d9f1871a077288a4ccb6fc9dd933cc147adf4
author Daniel Rosenberg <drosen@google.com> 1562970144 -0700
committer android-build-team Robot <android-build-team-robot@google.com> 1563245715 +0000

installd: Account for empty  obb contents on migration

We need /data/media/obb on devices with old kernels. Since that folder
is present, we should check if there are contents there before migrating
data.

This also fixes the check for if the kernel supports the unshared_obb
option. If it does, it only does the migration if there is data to
migrate.

Test: Boot with GSI over P, boot normal Q, with and without data at
      /data/media/obb. With data, it should migrate. Without data it
      shoud skip the migration. On GSI on P it should skip the
      migration.
Bug: 136199978
Change-Id: I41b0ec7a8a6b57b2ea6a530630d56c00f758009a
(cherry picked from commit c0439c785eafbbc1e2e88b94e15bae6e92e6c51b)