tree d9d1bce05926d1562f1d97bd3b0056063666498a
parent 7fd9b8b7f36a84dafc9150a45ccd20bf11dae9f5
author Yifan Hong <elsk@google.com> 1582064354 -0800
committer Yifan Hong <elsk@google.com> 1583270389 -0800

libsnapshot: RemoveUpdateState on rollback.

If rollback is detected in ProcessUpdateState, call
RemoveUpdateState and return UpdateState::Cancelled. Now that
update_engine is reponsible for initiating the merge, it can react to
this state and clean up markers appropriately.

Test: libsnapshot_test
Test: apply OTA, manually rollback (by setting the active slot), then
  inspect /metadata/ota as well as /data/misc/update_engine/prefs.

Bug: 147696014

Change-Id: Ibfee11fb50e4f4fb7c6cf02b4921b35e77b8f5a5