Do not map dynamic partitions on VABC devices

With VABC, we no longer need to map all partitions before
reading/writing, so don't try to map them.
1. modify GetPartitionDevice to return empty path for target partitions
on VABC
2. Add a separate GetMountableTargetDevice for obtaining a mountable
device path, specifically for postinstall

Test: treehugger
Change-Id: Ib1f608914fc49c677ce7389140ca79b028171191

1 files changed, 6 insertions, 0 deletions

diff --git a/common/dynamic_partition_control_interface.h b/common/dynamic_partition_control_interface.h
index 1362c19e..855d6e82 100644
--- a/common/dynamic_partition_control_interface.h
+++ b/common/dynamic_partition_control_interface.h
@@ -36,6 +36,12 @@ class ISnapshotWriter;
 
 namespace chromeos_update_engine {
 
+struct PartitionDevice {
+  std::string rw_device_path;
+  std::string mountable_device_path;
+  bool is_dynamic;
+};
+
 struct FeatureFlag {
   enum class Value { NONE = 0, RETROFIT, LAUNCH };
   constexpr explicit FeatureFlag(Value value) : value_(value) {}