tree 6310389d540a3bd86a3810c0d128e3880b9f0864
parent d3865d1bc4298739652ee101d1b625fb12361f9b
author Tianjie <xunchang@google.com> 1591307839 -0700
committer Tianjie <xunchang@google.com> 1592260855 -0700

Implement PartitionUpdateGenerator for partial updates

Implement the logic in PartitionUpdateGenerator. Here's the summary,
1. finds the a/b partitions (both static & dynamic) on the device

For partitions not included in the payload:
2. calculates the partition hash for filesystem verification
3. generates one SOURCE_COPY operation for each static partition

The order of the partitions are sorted. So the update will resume from
the correct operation in case it's interruptted.

Bug: 157778739
Test: run a partial OTA with boot & system_ext
Change-Id: I5683b85e3c6dab813a33d5144aceb996fd8163d4