tree 904b1a546cbcd8393a95dacfe394eb5adfcab087
parent 23ba59e60ffe386e1f7a35883355aefa6fa9089d
author xunchang <xunchang@google.com> 1556213856 -0700
committer Tianjie Xu <xunchang@google.com> 1556311490 -0700

Set the block device to be writable before writing verity data

The block device is set to be writable when the delta performer opens
the partition to perfrom writes. But if the update interrupts and the
device reboots during the verity data calculation, update engine will
consider the write actions done on resumes and skip setting the writable
flag. As a result, the resumed update will fail to write the hashtree
with EPERM.

A possible fix is to explicltly set the flag when the FilesystemVerifierAction
wants to write verity data.

Bug: 131232680
Test: Interrupt the update during verity writing, reboot and check the
update resumes correctly

Change-Id: I1007414139e4ae5be3fc60ec73b18264d4baa60e