Rework the vboot_reference make system.

tests/common.sh

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Determine script directory.
-if [[ $0 == '/'* ]]; 
+if [[ $0 == '/'* ]];
 then
   SCRIPT_DIR="`dirname $0`"
 elif [[ $0 == './'* ]];
 then
   SCRIPT_DIR="`pwd`"
 else
   SCRIPT_DIR="`pwd`"/"`dirname $0`"
 fi
 
-UTIL_DIR=`dirname ${SCRIPT_DIR}`/utility
-TEST_DIR=${SCRIPT_DIR}
+ROOT_DIR="$(dirname ${SCRIPT_DIR})"
+BUILD_DIR="${ROOT_DIR}/build"
+UTIL_DIR="${BUILD_DIR}/utility"
+TEST_DIR="${BUILD_DIR}/tests"
 TESTKEY_DIR=${SCRIPT_DIR}/testkeys
 TESTCASE_DIR=${SCRIPT_DIR}/testcases
+TESTKEY_SCRATCH_DIR=${TEST_DIR}/testkeys
+
+if [ ! -d ${TESTKEY_SCRATCH_DIR} ]; then
+    mkdir ${TESTKEY_SCRATCH_DIR}
+fi
 
 # Color output encodings.
 COL_RED='\E[31;1m'
 COL_GREEN='\E[32;1m'
 COL_YELLOW='\E[33;1m'
 COL_BLUE='\E[34;1m'
 COL_STOP='\E[0;m'
 
 hash_algos=( sha1 sha256 sha512 )
 key_lengths=( 1024 2048 4096 8192 ) 
 
 function happy {
   echo -e "${COL_GREEN}$*${COL_STOP}" 1>&2
 }
 
 function warning {
   echo -e "${COL_YELLOW}WARNING: $*${COL_STOP}" 1>&2
 }
 
 function error {
   echo -e "${COL_RED}ERROR: $*${COL_STOP}" 1>&2
   exit 1
 }
 
 function check_test_keys {
   [ -d ${TESTKEY_DIR} ] || \
     error "You must run gen_test_keys.sh to generate test keys first."
 }