tree 17b081ae2d76669eaec8659a48a43d3c45cdb45b
parent dca771d0d82480f60419da97e5de4f3c2bc10387
author Hung-Te Lin <hungte@chromium.org> 1486722141 +0800
committer chrome-bot <chrome-bot@chromium.org> 1486744368 -0800

vpd_get_value: Allow ignoring cache by environment VPD_IGNORE_CACHE.

Some programs may want to read current VPD values, or from the
dump_vpd_log cache files (usually for testing, or factory provisioning).

Add two environment variables to control how vpd_get_value retrieves VPD
values:

 VPD_IGNORE_CACHE: Ignore any caches (read directly by 'vpd -g').
 VPD_IGNORE_SYS_CACHE: Ignore cache from /sys/firmware.

BRANCH=None
BUG=None
TEST=vpd_get_value customization_id # A-B
     vpd -s customization_id=C-D
     vpd_get_value customization_id # A-B
     VPD_IGNORE_CACHE=1 vpd_get_value customization_id # C-D
     VPD_IGNORE_SYS_CACH=1 vpd_get_value customization_id # A-B
     dump_vpd_log --force
     VPD_IGNORE_CACHE=1 vpd_get_value customization_id # C-D
     VPD_IGNORE_SYS_CACH=1 vpd_get_value customization_id # C-D

Change-Id: Id2e1be9596cdff1ff8b4810d89d2b1f91e29ba87
Reviewed-on: https://chromium-review.googlesource.com/440713
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Ting Shen <phoenixshen@chromium.org>