sign_official_build: support new firmware updater repacking method

To prevent hard-coding the procedure to repack a firmware updater, this CL
supports using new "--sb_repack" mode supported by updater so that signer does
not need to care about how the updater is packed anymore.

BUG=chromium-os:20027
TEST=./sign_official_build.sh ssd \
     ~/trunk/src/build/images/x86-zgb/latest/chromiumos_image.bin \
     ../../tests/devkeys \
     ~/trunk/src/build/images/x86-zgb/latest/chromiumos_new_image.bin
     # success

Change-Id: I035dfaa86b05b85748e69ec039769b0c08d33f64
Reviewed-on: http://gerrit.chromium.org/gerrit/7311
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
1 file changed