update_engine: Enterprise channel downgrade
Powerwash and roll back when an enrolled user downgrades the channel:
- If the admin downgrades channel, check for ChannelDowngradebehavior
policy.
- If the user downgrades the channel, powerwash based on given boolean.
Add the "rollback" flag to the powerwash file to try to preserve some
data.
Note that this change is not affecting users yet: The
ChannelDowngradeBehavior policy is not available in DPanel and the UI
does not support chosing powerwash on channel downgrade for enrolled
users.
BUG=chromium:1122531
TEST=FEATURES=test emerge-amd64-generic update_engine
TEST=Set policy with YAPS and test on device
Change-Id: I2f02a6e752eed083b57484766f8e7ecc2eed7aca
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/system/update_engine/+/2397890
Tested-by: Miriam Polzer <mpolzer@google.com>
Commit-Queue: Miriam Polzer <mpolzer@google.com>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Jae Hoon Kim <kimjae@chromium.org>
diff --git a/update_manager/policy.h b/update_manager/policy.h
index 9194c38..4b3bfc7 100644
--- a/update_manager/policy.h
+++ b/update_manager/policy.h
@@ -58,6 +58,9 @@
// (e.g. no device policy is available yet), in this case no version
// roll-forward should happen.
int rollback_allowed_milestones;
+ // Whether a rollback with data save should be initiated on channel
+ // downgrade (e.g. beta to stable).
+ bool rollback_on_channel_downgrade{false};
// A target channel, if so imposed by policy; otherwise, an empty string.
std::string target_channel;
// Specifies if the channel hint, e.g. LTS (Long Term Support) updates.