tree 7756315c8535a652bf2f9a9758d10e6d68cbda5f
parent 2e1de4f9f0457cd6117ddb22ffef72c8e2fbd4f3
author Alex Deymo <deymo@google.com> 1463015629 -0700
committer Alex Deymo <deymo@google.com> 1463103826 -0700

Truncate source partitions to a multiple of 4 KiB.

When flashing partitions that aren't a multiple of 4 KiB using fastboot,
the last block of these partitions would not be padded with zeros. Full
and incremental paylaods will pad with zeros and write them on the new
target partitions, but the first incremental package after flashing a
device would fail.

This patch truncates the source partitions that aren't multiple of 4
KiB, discarding the data on the last partial 4 KiB block.

Bug: 28626303
TEST=`brillo_update_payload generate ..` a null-incremental payload;
boot.img includes mostly SOURCE_COPY and one REPLACE operation at the
end.

(cherry picked from commit a479a4d0039308fcfdda21f2a8ec8d040fd716f2)

Change-Id: I415f8d315d95f6fc9d7e76783fe0487cd19feba5