tree c13477abb72557fb53eeb2ac80b211923784d34a
parent 135197526b9c0f5a9acac57a05129339f311bbca
author Alex Deymo <deymo@google.com> 1470184022 -0700
committer Alex Deymo <deymo@google.com> 1470801324 +0000

Report the progress of the update when sideloading.

update_engine_sideload now accepts a file descriptor number via a new
--status_fd flag. When applying the update, it will report back to
recovery via this file descriptor the progress of the update in the
format expected by recovery.

This patch also initializes the Subprocess singleton used during the
update.

Bug: 27178350
TEST=Executed update_engine_sideload from recovery and watched message updates.

Change-Id: I40f5452c9220530651e8cd6cde681e39dd0a6aad