Make cardreader mis-matched a special case to prompt error.

client/site_tests/hardware_Components/hardware_Components.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, hashlib, logging, os, pprint, re
 from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
 from autotest_lib.client.common_lib import flashrom_util
 from autotest_lib.client.common_lib import site_vblock
 
@@ skipping 275 matching lines @@
     def pformat(self, obj):
         return "\n" + self._pp.pformat(obj) + "\n"
 
 
     def initialize(self):
         self._pp = pprint.PrettyPrinter()
 
 
     def run_once(self, approved_dbs='approved_components', ignored_cids=[]):
         self._ignored = ignored_cids
-        all_failures = ''
+        only_cardreader_failed = False
+        all_failures = 'The following components are not matched.\n'
         os.chdir(self.bindir)
 
         # approved_dbs supports shell-like filename expansion.
         for db in glob.iglob(approved_dbs):
             self._system = {}
             self._failures = {}
 
             if not os.path.exists(db):
                 raise error.TestError('Unable to find approved db: %s' % db)
 
@@ skipping 11 matching lines @@
 
             for cid in self._check_existence_cids:
                 self.check_approved_part_id_existence(cid, type='others')
 
             logging.debug('System: %s', self.pformat(self._system))
 
             outdb = os.path.join(self.resultsdir, 'system_components')
             utils.open_write_close(outdb, self.pformat(self._system))
 
             if self._failures:
-                all_failures += 'Approved DB: %s' % db
+                if self._failures.keys() == ['part_id_cardreader']:
+                    only_cardreader_failed = True
+                all_failures += 'For DB %s:' % db
                 all_failures += self.pformat(self._failures)
             else:
                 # If one of DBs is matched, record the hwqual_id and exit.
                 self.write_test_keyval(
                     {'hwqual_id': self._approved['part_id_hwqual'][0]})
                 return
 
+        if only_cardreader_failed:
+            all_failures = ('You may forget to insert an SD card.\n' +
+                            all_failures)
+
         raise error.TestFail(all_failures)