tree 553152099b2590b263619a16773c7d076f35eee6
parent 6cf8e675a37c3b61cea0d313f8006068a1b3190a
author Amin Hassani <ahassani@chromium.org> 1552944046 -0700
committer chrome-bot <chrome-bot@chromium.org> 1553797012 -0700

update_engine: Add support for DLC packages.

The update_engine can handle downloading multipe apckages per an App
ID. Currently each DLC is tied to an AppID and currently we have only
one image per DLC. This basically restricts our ability to support
multiple images per DLC in the future and if not fixed now, it would be
near impossible to add it in the future.

Currently, in order to find the location of a DLC module, the
location (dlc-id) is inferred from the paritition name structured like
dlc_<dlc-id>. In order to handled multiple packages for each DLC, we can
add another argument dlc-package in the partition name which allows us
to identify different packages. The new format for the partition name is
as follows:
dlc/<dlc-id>/<dlc-package>

BUG=chromium:908994
TEST=unittest
CQ-DEPEND=CL:1532852, CL:1532770, CL:1532851, CL:1531833, CL:1531834

Change-Id: Ie9d03e23b5a44a963ab9a088e66f3d6bbbb9d664
Reviewed-on: https://chromium-review.googlesource.com/1532771
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Xiaochu Liu <xiaochu@chromium.org>