tree 5000c684c4cc30b22c8f9fc349aea2a9b56ddd41
parent d6f60079258fa385b583dac9e770afd2ea3c9aeb
author Alex Deymo <deymo@google.com> 1444677764 -0700
committer Alex Deymo <deymo@google.com> 1444857072 +0000

Base the update complete marker on persisted data.

The update complete marker was stored in /var/run, a fixed volatile
location. The marker would signal that an update was already applied
even after an update_engine crash and subsequent restart.

This location, while quite standard on the Unix FHS, is not
available in Android. This patch achieves the same goal by storing the
boot_id in the persisted prefs directory.

Bug: 24868648
Test: Unittests. Restarted update_engine after an update, keeps saying NEED_REBOOT.

Change-Id: I4dc2cbaeaeb0fd3197fa89168deaa042cb776d61