Support per-partition timestamps
update_engine is heading toward supporting partial updates, which an OTA
update can update just a subset of all partitions. In this context, a
single max_timestamp in OTA manifest is insufficient for checking
potential downgrades, as different partitions can have different
timestamps. This CL adds per-partition timestamp support on
update_engine side. update_engine will accept a payload with
per-partition timestamps and reject the update if any partition has an
older timestamp.
Changes made:
1. Add new version field to PartitionUpdate protobuf message.
2. Add new methods to HardwareInterface for fetching/checking
timestamp of each partition.
3. Update delta_performer to invoke new APIs in 2 properly.
4. Add relevant testcases.
Test: unittest
Bug: 162553432
Change-Id: I767343e003fd35ce0d22197b15040488cf30be30
diff --git a/update_metadata.proto b/update_metadata.proto
index e6a067e..f79e38b 100644
--- a/update_metadata.proto
+++ b/update_metadata.proto
@@ -288,6 +288,11 @@
// The number of FEC roots.
optional uint32 fec_roots = 16 [default = 2];
+
+ // Per-partition version used for downgrade detection, added
+ // as an effort to support partial updates. For most partitions,
+ // this is the build timestamp.
+ optional string version = 17;
}
message DynamicPartitionGroup {