tree cbfc96b00a64d97e1f1379d901dc0152a4d05183
parent 4b3cdce702fefa7eac0626f57d09ff018127c191
author Tao Bao <tbao@google.com> 1456432180 -0800
committer Tao Bao <tbao@google.com> 1456961612 -0800

recovery: Handle devices without /cache partition.

Since we may not have /cache partition on A/B devices, let recovery
handle /cache related operations gracefully if /cache doesn't exist.

(1) Disable the wipe for /cache partition.

(2) Skip wiping /cache while wiping /data (i.e. factory reset).

(3) Disable logging-related features, until we figure out better
ways / places to store recovery logs (mainly for factory resets on A/B
devices).

Bug: 27176738
Change-Id: I7b14e53ce18960fe801ddfc15380dac6ceef1198