tree 5f5b5293b83c59e676b3cb6a55af5aa6906b3289
parent 30b09d0c5a6ddf86a65615f46e809d53d570f4b2
author Kelvin Zhang <zhangkelvin@google.com> 1603820665 -0400
committer Kelvin Zhang <zhangkelvin@google.com> 1604931109 +0000

Handle resume of VABC updates by emitting labels

To support resuming an update with Virtual AB Compression, we emit
labels in between operations. Before writing any data to CowWriter, we
emit label 0. After writing all SOURCE_COPY, we emit label 1. Each time
we finished writing an InstallOp, we emit a label incremented by 1. When
resuming, we pass the label to CowWriter.

Test: treehugger
Change-Id: I126efc406286a30a6090a9ce14c65a7d273aee56