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1# Copyright (c) 2011 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"""Provides utility methods for interacting with upstart"""
6
7import os
8
9from autotest_lib.client.common_lib import utils
10
11def ensure_running(service_name):
12    """Fails if |service_name| is not running.
13
14    @param service_name: name of the service.
15    """
16    cmd = 'initctl status %s | grep start/running' % service_name
17    utils.system(cmd)
18
19
20def has_service(service_name):
21    """Returns true if |service_name| is installed on the system.
22
23    @param service_name: name of the service.
24    """
25    return os.path.exists('/etc/init/' + service_name + '.conf')
26
27
28def is_running(service_name):
29    """
30    Returns true if |service_name| is running.
31
32    @param service_name: name of service
33    """
34    return utils.system_output('status %s' % service_name).find('start/running') != -1
35
36def restart_job(service_name):
37    """
38    Restarts an upstart job if it's running.
39    If it's not running, start it.
40
41    @param service_name: name of service
42    """
43
44    if is_running(service_name):
45        utils.system_output('restart %s' % service_name)
46    else:
47        utils.system_output('start %s' % service_name)
48
49def stop_job(service_name):
50   """
51   Stops an upstart job.
52   Fails if the stop command fails.
53
54   @param service_name: name of service
55   """
56
57   utils.system('stop %s' % service_name)
58