tree b0da76132e89183f0e1e5b20ae80c08a3dc2901a
parent 2e4dd9ab2635f6a22df407ae1ee4dc16e0601102
author Tao Bao <tbao@google.com> 1432242589 -0700
committer Tao Bao <tbao@google.com> 1436906210 -0700

Assert the stash size when generating OTAs.

With block-based OTA v2 and v3, it requires stash space on the /cache
partition to back up blocks during an update. We need to ensure that
it doesn't exceed the partition size. Since there might be other files
on /cache as well, we use cache_size * threshold as the maximum allowed
size. The threshold defaults to 0.8, which can be overridden by command
line option '--stash_threshold'.

Change-Id: I5c2e353ea4716328d6cdc6a7f758520de8d88b8e
(cherry picked from commit 23ac4042128e47f6fe1ef176e7cb96f907d8e149)