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For debugging purposes, we like to see the kernel command line that a particular kernel is using. We have all the tools to do this already, but not easy to leverage (you have to manually extract/etc...). So add a "dump_config" helper to help people out. Further, the existing argc processing is incomplete and not terribly friendly. Add some useful error messages explaining why we quit. BUG=None TEST=`./sign_official_build.sh dump_config <bin>` works TEST=`./sign_official_build.sh verify <bin>` works TEST=`./sign_official_build.sh` shows usage TEST=`./sign_official_build.sh recovery <bin>` shows usage TEST=`./sign_official_build.sh recovery <bin> / /tmp/foo` tries to sign BRANCH=None Change-Id: I9f94250b8c299783bdcba704733974c6a5491101 Reviewed-on: https://gerrit.chromium.org/gerrit/39603 Reviewed-by: Paul Taysom <taysom@chromium.org> Commit-Ready: Mike Frysinger <vapier@chromium.org> Tested-by: Mike Frysinger <vapier@chromium.org>