1 # Copyright 2016 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 """Utilities used with Brillo hosts.""" 6 7 import contextlib 8 import logging 9 10 import common 11 from autotest_lib.client.bin import utils 12 13 14 _RUN_BACKGROUND_TEMPLATE = '( %(cmd)s ) </dev/null >/dev/null 2>&1 & echo -n $!' 15 16 _WAIT_CMD_TEMPLATE = """\ 17 to=%(timeout)d; \ 18 while test ${to} -ne 0; do \ 19 test $(ps %(pid)d | wc -l) -gt 1 || break; \ 20 sleep 1; \ 21 to=$((to - 1)); \ 22 done; \ 23 test ${to} -ne 0 -o $(ps %(pid)d | wc -l) -eq 1 \ 24 """ 25 26 27 def run_in_background(host, cmd): 28 """Runs a command in the background on the DUT. 29 30 @param host: A host object representing the DUT. 31 @param cmd: The command to run. 32 33 @return The background process ID (integer). 34 """ 35 background_cmd = _RUN_BACKGROUND_TEMPLATE % {'cmd': cmd} 36 return int(host.run_output(background_cmd).strip()) 37 38 39 def wait_for_process(host, pid, timeout=-1): 40 """Waits for a process on the DUT to terminate. 41 42 @param host: A host object representing the DUT. 43 @param pid: The process ID (integer). 44 @param timeout: Number of seconds to wait; default is wait forever. 45 46 @return True if process terminated within the alotted time, False otherwise. 47 """ 48 wait_cmd = _WAIT_CMD_TEMPLATE % {'pid': pid, 'timeout': timeout} 49 return host.run(wait_cmd, ignore_status=True).exit_status == 0 50 51 52 @contextlib.contextmanager 53 def connect_to_ssid(host, ssid, passphrase): 54 """Connects to a given ssid. 55 56 @param host: A host object representing the DUT. 57 @param ssid: A string representing the ssid to connect to. If ssid is None, 58 assume that host is already connected to wifi. 59 @param passphrase: A string representing the passphrase to the ssid. 60 Defaults to None. 61 """ 62 try: 63 if ssid is None: 64 # No ssid is passed. It is assumed that the host is already 65 # connected to wifi. 66 logging.warning('This test assumes that the device is connected to ' 67 'wifi. If it is not, this test will fail.') 68 yield 69 else: 70 logging.info('Connecting to ssid %s', ssid) 71 # Update the weaved init.rc to stop privet. This sets up shill in 72 # client mode allowing it to connect to wifi. 73 host.remount() 74 host.run('sed \'s/service weaved \/system\/bin\/weaved/' 75 'service weaved \/system\/bin\/weaved --disable_privet/\' ' 76 '-i /system/etc/init/weaved.rc') 77 host.reboot() 78 utils.poll_for_condition( 79 lambda: 'running' in host.run('getprop init.svc.shill' 80 ).stdout, 81 sleep_interval=1, timeout=300, 82 desc='shill was not started by init') 83 logging.info('Connecting to wifi') 84 wifi_cmd = ('shill_setup_wifi --ssid=%s ' 85 '--wait-for-online-seconds=%i' % (ssid, 300)) 86 if passphrase: 87 wifi_cmd += ' --passphrase=%s' % passphrase 88 host.run(wifi_cmd) 89 yield 90 finally: 91 if ssid: 92 # If we connected to a ssid, disconnect. 93 host.remount() 94 host.run('sed \'s/service weaved \/system\/bin\/weaved ' 95 '--disable_privet/service weaved \/system\/bin\/weaved/\' ' 96 '-i /system/etc/init/weaved.rc') 97 host.run('stop weaved') 98 host.run('start weaved') 99
