tree 567e91f75a1e80f9c9f63810b95c5a6059869fdd
parent 9614350fdecd73ded555d6ea06097c70416575af
author Marton Hunyady <hunyadym@chromium.org> 1529073877 +0200
committer chrome-bot <chrome-bot@chromium.org> 1529529828 -0700

update_engine: Allow rollback to kiosk-specified target version

The RollbackToTargetVersion policy can now allow rolling back to
the target version specified by the kiosk app manifest if the
AllowKioskAppControlChromeVersion is set to true.

To use this, the following policies must be set:
- AutoUpdateDisabled = True
- AllowKioskAppControlChromeVersion = True
- RollbackToTargetVersion = ROLLBACK_WITH_FULL_POWERWASH
- TargetVersionPrefix = not set

And the kiosk app has to specify in the manifest.json:
- required_platform_version = 10718

This setup will now initiate a rollback.

BUG=chromium:853161
TEST='cros_run_unit_tests --board=caroline --packages update_engine'

Change-Id: I870e2e2ddc1c915e5599b28944a07ff55e711d5b
Reviewed-on: https://chromium-review.googlesource.com/1102509
Commit-Ready: Marton Hunyady <hunyadym@chromium.org>
Tested-by: Marton Hunyady <hunyadym@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>