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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
11
12def emit_event(event_name):
13    """Fails if the emit command fails.
14
15    @param service_name: name of the service.
16    """
17    utils.system('initctl emit %s' % event_name)
18
19
20def ensure_running(service_name):
21    """Fails if |service_name| is not running.
22
23    @param service_name: name of the service.
24    """
25    cmd = 'initctl status %s | grep start/running' % service_name
26    utils.system(cmd)
27
28
29def has_service(service_name):
30    """Returns true if |service_name| is installed on the system.
31
32    @param service_name: name of the service.
33    """
34    return os.path.exists('/etc/init/' + service_name + '.conf')
35
36
37def is_running(service_name):
38    """
39    Returns true if |service_name| is running.
40
41    @param service_name: name of service
42    """
43    return utils.system_output('status %s' % service_name).find('start/running') != -1
44
45def restart_job(service_name):
46    """
47    Restarts an upstart job if it's running.
48    If it's not running, start it.
49
50    @param service_name: name of service
51    """
52
53    if is_running(service_name):
54        utils.system_output('restart %s' % service_name)
55    else:
56        utils.system_output('start %s' % service_name)
57
58def stop_job(service_name):
59    """
60    Stops an upstart job.
61    Fails if the stop command fails.
62
63    @param service_name: name of service
64    """
65
66    utils.system('stop %s' % service_name)
67