update_engine: added CanRollback dbus method
Added a method to the update engine to check if a rollback
partition is available and can be booted from.
update_engine_client is also updated to call the function
when --can_rollback paramater is specified
BUG=chromium:343301
TEST=Ran "update_engine_client --can_rollback" and unit tests
Change-Id: If3fcb29a0067069a22812f60e9b67c6fdbbd18bd
Reviewed-on: https://chromium-review.googlesource.com/187157
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/dbus_service.h b/dbus_service.h
index 5d0f500..32bb599 100644
--- a/dbus_service.h
+++ b/dbus_service.h
@@ -62,6 +62,13 @@
gboolean powerwash,
GError **error);
+// Checks if the system rollback is available by verifying if the secondary
+// system partition is valid and bootable.
+gboolean update_engine_service_can_rollback(
+ UpdateEngineService* self,
+ gboolean* out_can_rollback,
+ GError **error);
+
gboolean update_engine_service_reset_status(UpdateEngineService* self,
GError **error);