update_engine: Add fds for the source partitions.
Add new fds for the source partition, one for the rootfs and another for
the kernel. These are opened if we have a delta update with minor
version 2.
This change also adds support for changing the minor versions in tests.
There is a new private member, supported_minor_version_, which defaults
to kSupportedMinorPayloadVersion. It is set in the unit tests with calls
to SetSupportedVersion.
BUG=chromium:463573
TEST=`FEATURES=test emerge-link update_engine`
Change-Id: Ib988c91eb450b2499c615ae65b271691dfd9c651
Reviewed-on: https://chromium-review.googlesource.com/260950
Trybot-Ready: Allie Wood <alliewood@chromium.org>
Tested-by: Allie Wood <alliewood@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Allie Wood <alliewood@chromium.org>
10 files changed