tree 1f70cfce9819476bb1065bda730833b89502d62d
parent 13e0dd63e68f2003b46d413d499760b5a7631a03
author Alex Deymo <deymo@chromium.org> 1435377426 -0700
committer ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> 1435806178 +0000

update_engine: Expose the update_engine.conf in the FilesystemInterface.

The old image contains a /etc/update_engine.conf file that states the
payload version supported by that image. Currently we read this file
directly from the mounted filesystem and parse its contents. To stop
mounting the filesystem we need to retrieve the information on this file
somehow.

This patch extends the FilesystemInterface with a method to load the
update_engine.conf settings from the filesystem and implemets it using
ext2fs on ext2 filesystems.

CQ-DEPED=CL:282380
BUG=chromium:305832
TEST=Added new unittests with and without this file.

Change-Id: I41b41e8aac58c645fb40aabfe340cde8821e405a
Reviewed-on: https://chromium-review.googlesource.com/282381
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
Trybot-Ready: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>