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ansible/service
Stephen Fromm 32cb95e424 Add pattern option to service module 
Adds ability to check service status based on pattern.  The pattern
is a simple string.  If a pattern is provided, the output of ps is
checked first.
2012-08-17 14:00:01 -07:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
import platform
SERVICE = None
CHKCONFIG = None
INITCTL = None
PS_OPTIONS = 'auxww'
def _find_binaries(m):
# list of possible paths for service/chkconfig binaries
# with the most probable first
global SERVICE
global CHKCONFIG
global INITCTL
paths = ['/sbin', '/usr/sbin', '/bin', '/usr/bin']
binaries = [ 'service', 'chkconfig', 'update-rc.d', 'initctl']
location = dict()
for binary in binaries:
location[binary] = None
for binary in binaries:
for path in paths:
if os.path.exists(path + '/' + binary):
location[binary] = path + '/' + binary
break
if location.get('chkconfig', None):
CHKCONFIG = location['chkconfig']
elif location.get('update-rc.d', None):
CHKCONFIG = location['update-rc.d']
else:
m.fail_json(msg='unable to find chkconfig or update-rc.d binary')
if location.get('service', None):
SERVICE = location['service']
else:
m.fail_json(msg='unable to find service binary')
if location.get('initctl', None):
INITCTL = location['initctl']
else:
INITCTL = None
def _get_service_status(name, pattern):
rc, status_stdout, status_stderr = _run("%s %s status" % (SERVICE, name))
# set the running state to None because we don't know it yet
running = None
# If pattern is provided, search for that
# before checking initctl, service output, and other tricks
if pattern is not None:
psbin = '/bin/ps'
if not os.path.exists(psbin):
if os.path.exists('/usr/bin/ps'):
psbin = '/usr/bin/ps'
else:
psbin = None
if psbin is not None:
(rc, psout, pserr) = _run('%s %s' % (psbin, PS_OPTIONS))
# If rc is 0, set running as appropriate
# If ps command fails, fall back to other means.
if rc == 0:
if pattern in psout:
running = True
else:
running = False
# Check if we got upstart on the system and then the job state
if INITCTL != None and running is None:
# check the job status by upstart response
initctl_rc, initctl_status_stdout, initctl_status_stderr = _run("%s status %s" % (INITCTL, name))
if initctl_status_stdout.find("stop/waiting") != -1:
running = False
elif initctl_status_stdout.find("start/running") != -1:
running = True
# if the job status is still not known check it by response code
if running == None:
if rc == 3:
running = False
elif rc == 0:
running = True
# if the job status is still not known check it by status output keywords
if running == None:
# first tranform the status output that could irritate keyword matching
cleanout = status_stdout.lower().replace(name.lower(), '')
if "stop" in cleanout:
running = False
elif "run" in cleanout and "not" in cleanout:
running = False
elif "run" in cleanout and "not" not in cleanout:
running = True
elif "start" in cleanout and "not" not in cleanout:
running = True
elif 'could not access pid file' in cleanout:
running = False
elif 'is dead and pid file exists' in cleanout:
running = False
# if the job status is still not known check it by special conditions
if running == None:
if name == 'iptables' and status_stdout.find("ACCEPT") != -1:
# iptables status command output is lame
# TODO: lookup if we can use a return code for this instead?
running = True
return running
def _run(cmd):
# returns (rc, stdout, stderr) from shell command
process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
stdout, stderr = process.communicate()
return (process.returncode, stdout, stderr)
def _do_enable(name, enable):
# we change argument depending on real binary used
# update-rc.d wants enable/disable while
# chkconfig wants on/off
valid_argument = dict({'on' : 'on', 'off' : 'off'})
if CHKCONFIG.endswith("update-rc.d"):
valid_argument['on'] = "enable"
valid_argument['off'] = "disable"
if enable is not None:
if enable:
rc, stdout, stderr = _run("%s %s %s" % (CHKCONFIG, name, valid_argument['on']))
else:
rc, stdout, stderr = _run("%s %s %s" % (CHKCONFIG, name, valid_argument['off']))
return rc, stdout, stderr
def main():
module = AnsibleModule(
argument_spec = dict(
name = dict(required=True),
state = dict(choices=['running', 'started', 'stopped', 'restarted', 'reloaded']),
pattern = dict(required=False, default=None),
enabled = dict(choices=BOOLEANS)
)
)
name = module.params['name']
state = module.params['state']
pattern = module.params['pattern']
enable = module.boolean(module.params.get('enabled', None))
# Set PS options here if 'ps auxww' will not work on
# target platform
if platform.system() == 'SunOS':
global PS_OPTIONS
PS_OPTIONS = '-ef'
# ===========================================
# find binaries locations on minion
_find_binaries(module)
# ===========================================
# get service status
running = _get_service_status(name, pattern)
# ===========================================
# Some common variables
changed = False
rc = 0
err = ''
out = ''
if module.params['enabled']:
rc_enable, out_enable, err_enable = _do_enable(name, enable)
rc += rc_enable
out += out_enable
err += err_enable
if state and running == None:
module.fail_json(msg="failed determining the current service state => state stays unchanged", changed=False)
elif state:
# a state change command has been requested
# ===========================================
# determine if we are going to change anything
if not running and state in ["started", "running"]:
changed = True
elif running and state in ["stopped","reloaded"]:
changed = True
elif state == "restarted":
changed = True
# ===========================================
# run change commands if we need to
if changed:
if state in ['started', 'running']:
rc_state, stdout, stderr = _run("%s %s start" % (SERVICE, name))
elif state == 'stopped':
rc_state, stdout, stderr = _run("%s %s stop" % (SERVICE, name))
elif state == 'reloaded':
rc_state, stdout, stderr = _run("%s %s reload" % (SERVICE, name))
elif state == 'restarted':
rc1, stdout1, stderr1 = _run("%s %s stop" % (SERVICE, name))
rc2, stdout2, stderr2 = _run("%s %s start" % (SERVICE, name))
rc_state = rc + rc1 + rc2
stdout = stdout1 + stdout2
stderr = stderr1 + stderr2
out += stdout
err += stderr
rc = rc + rc_state
if rc != 0:
module.fail_json(msg=err)
result = {"changed": changed}
if module.params['enabled']:
result['enabled'] = module.params['enabled']
if state:
result['state'] = state
rc, stdout, stderr = _run("%s %s status" % (SERVICE, name))
module.exit_json(**result)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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