Prevent uninitialized variable in factory_WriteGBB

client/site_tests/factory_WriteGBB/factory_WriteGBB.py

 # 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.
 
 import glob, os
 
 from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
 from autotest_lib.client.common_lib import gbb_util
 
 
 class factory_WriteGBB(test.test):
     version = 2
 
     def run_once(self, shared_dict={}):
         # More convenient to set the CWD to hardware_Components since a lot of
         # values in the component list are based on that directory.
         os.chdir(os.path.join(self.bindir, '../hardware_Components'))
 
         # If found the HwQual ID in shared_dict, identify the component files.
         if 'part_id_hwqual' in shared_dict:
             id = shared_dict['part_id_hwqual'].replace(' ', '_')
             component_file = 'data_*/components_%s' % id
+        else:
+            raise error.TestError(
+                    'You need to run this test from factory UI, and have ' +
+                    'successfully completed the HWQual-ID matching test ')
 
         component_files = glob.glob(component_file)
         if len(component_files) != 1:
             raise error.TestError(
                 'Unable to find the component file: %s' % component_file)
         component_file = component_files[0]
         components = eval(utils.read_file(component_file))
 
         gbb = gbb_util.GBBUtility(temp_dir=self.resultsdir,
                                   keep_temp_files=True)
         gbb.set_bmpfv(utils.read_file(components['data_bitmap_fv'][0]))
         gbb.set_hwid(components['part_id_hwqual'][0])
         gbb.set_recoverykey(utils.read_file(components['key_recovery'][0]))
         gbb.set_rootkey(utils.read_file(components['key_root'][0]))
         gbb.commit()