tree 0caf7040e82af7f40c5d79e195f5dfff24eaea7b
parent 3c242c5ddb8b867b916875c8e05c260a9d8571b6
author Tao Bao <tbao@google.com> 1426188757 -0700
committer Tao Bao <tbao@google.com> 1426193224 -0700

Restrict the verification in block-based incremental OTAs

BlockImageDiff has three versions. Only the incremental OTAs generated
with the latest version (3) can be re-applied to the system that's
already on the target build. Otherwise, operations like move will make
unconditional changes and damage the system. During the verification
phase, abort the OTA update if BlockImageDiff is less than 3 and it
doesn't match the checksum of the source build.

Change-Id: I3a776495b69e1d174fcb01b10e40c0e912914fd8