If qualified components not specified, use the one based on board name.

mod_image_for_test.sh

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 # Script to modify a keyfob-based chromeos system image for testability.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
@@ skipping 10 matching lines @@
 DEFINE_string board "$DEFAULT_BOARD" "Board for which the image was built" b
 DEFINE_boolean factory $FLAGS_FALSE \
     "Modify the image for manufacturing testing" f
 DEFINE_boolean factory_install $FLAGS_FALSE \
     "Modify the image for factory install shim"
 DEFINE_string image "" "Location of the rootfs raw image file" i
 DEFINE_boolean installmask $FLAGS_TRUE \
     "Use INSTALL_MASK to shrink the resulting image." m
 DEFINE_integer jobs -1 \
     "How many packages to build in parallel at maximum." j
-DEFINE_string qualdb "/tmp/run_remote_tests.*" \
-    "Location of qualified component file" d
+DEFINE_string qualdb "" "Location of qualified component file" d
 DEFINE_boolean yes $FLAGS_FALSE "Answer yes to all prompts" y
 DEFINE_string build_root "/build" \
     "The root location for board sysroots."
 
 
 # Parse command line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 EMERGE_CMD="emerge"
@@ skipping 143 matching lines @@
   # Run test setup script to modify the image
   sudo GCLIENT_ROOT="${GCLIENT_ROOT}" ROOT_FS_DIR="${ROOT_FS_DIR}" \
       STATEFUL_DIR="${STATEFUL_DIR}" "${MOD_TEST_ROOT}/test_setup.sh"
 
   if [ ${FLAGS_factory} -eq ${FLAGS_TRUE} ]; then
     install_autotest
 
     MOD_FACTORY_ROOT="${GCLIENT_ROOT}/src/scripts/mod_for_factory_scripts"
     # Run factory setup script to modify the image
     sudo GCLIENT_ROOT="${GCLIENT_ROOT}" ROOT_FS_DIR="${ROOT_FS_DIR}" \
-        QUALDB="${FLAGS_qualdb}" \
+        QUALDB="${FLAGS_qualdb}" BOARD=${FLAGS_board} \
         "${MOD_FACTORY_ROOT}/factory_setup.sh"
   fi
 fi
 
 # Let's have a look at the image just in case..
 if [ "${VERIFY}" = "true" ]; then
   pushd "${ROOT_FS_DIR}"
   bash
   popd
 fi
 
 cleanup
 
 print_time_elapsed
 
 trap - EXIT