Rewrite pipe (remove one stage) and remove reference to wlan0

client/site_tests/network_WiFiCaps/network_WiFiCaps.py

 # 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.
 
 import logging, os, re, string
 
 from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
 
 class network_WiFiCaps(test.test):
@@ skipping 20 matching lines @@
                 continue
         return results
 
 
     def __run_iwcap(self, phy, caps):
         dir = os.path.join(self.autodir, 'deps', 'iwcap', 'iwcap')
         iwcap = utils.run(dir + ' ' + phy + ' ' + string.join(caps))
         return self.__parse_iwcap(iwcap.stdout)
 
     def run_once(self):
-        phy = utils.system_output("iw list | grep Wiphy |"
-                                  " awk {'NR==1; print $2'}")
+        phy = utils.system_output("iw list | awk '/^WiPhy/ {print $2}'")
         if not phy or 'phy' not in phy:
-            raise error.TestFail('Physical interface for wlan0 not found')
+            raise error.TestFail('WiFi Physical interface not found')
 
         requiredCaps = {
             'sta'    : 'true',        # station mode
 
             '24ghz'  : 'true',        # 2.4GHz band
             '11b'    : 'true',
             '11g'    : 'true',
 
             '5ghz'   : 'true',        # 5GHz band
             '11a'    : 'true',
 
             '11n'    : 'true',        # 802.11n (both bands)
             'ht40'   : 'true',        # HT40
             'sgi40'  : 'true',        # Short GI in HT40
         }
 
         dep = 'iwcap'
         dep_dir = os.path.join(self.autodir, 'deps', dep)
         self.job.install_pkg(dep, 'dep', dep_dir)
 
         results = self.__run_iwcap(phy, requiredCaps.keys())
         for cap in requiredCaps:
             if not cap in results:
                 raise error.TestFail('Internal error, ' +
                     'capability "%s" not handled' % cap)
             if results[cap] != requiredCaps[cap]:
                 raise error.TestFail('Requirement not met: ' +
                     'cap "%s" is "%s" but expected "%s"'
                     % (cap, results[cap], requiredCaps[cap]))