Otherwise the applypatch executable will fail to back up the source
file to /cache when patching the recovery image.
Bug: 74198354
Test: run applypatch from boot to recovery
(cherry picked from commit b4e3a370bf)
Change-Id: I37b7fd88d66ab49ef953d4b7dca22577bd1472e1
This class allows us to set the following locations dynamically:
cache_temp_source, last_command_file, stash_directory_base.
In the updater's main function, we reset the values of these variables
to their default locations in /cache; while we can set them to temp
files in unit tests or host simulation.
Test: unit tests pass
Change-Id: I528652650caa41373617ab055d41b1f1a4ec0f87