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ansible/library/service
Daniel Hokka Zakrisson 20775c0b73 Fix service module for varnish initscript in EPEL 
It outputs 'dead but pid file exists'.
2012-10-31 12:31:08 +01:00

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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/>.
DOCUMENTATION = '''
---
module: service
author: Michael DeHaan
version_added: 0.1
short_description: Manage services.
description:
- Controls services on remote hosts.
options:
name:
required: true
description:
- Name of the service.
state:
required: false
choices: [ started, stopped, restarted, reloaded ]
description:
- I(started), I(stopped), I(reloaded), I(restarted).
I(Started)/I(stopped) are idempotent actions that will not run
commands unless necessary. I(restarted) will always bounce the
service. I(reloaded) will always reload.
pattern:
required: false
version_added: "0.7"
description:
- If the service does not respond to the status command, name a
substring to look for as would be found in the output of the I(ps)
command as a stand-in for a status result. If the string is found,
the service will be assumed to be running.
enabled:
required: false
choices: [ "yes", "no" ]
description:
- Whether the service should start on boot.
examples:
- code: "service: name=httpd state=started"
description: Example action from Ansible Playbooks
- code: "service: name=httpd state=stopped"
description: Example action from Ansible Playbooks
- code: "service: name=httpd state=restarted"
description: Example action from Ansible Playbooks
- code: "service: name=httpd state=reloaded"
description: Example action from Ansible Playbooks
- code: "service: name=foo pattern=/usr/bin/foo state=started"
description: Example action from Ansible Playbooks
'''
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', 'systemctl']
location = dict()
for binary in binaries:
location[binary] = None
for binary in binaries:
location[binary] = m.get_bin_path(binary)
if location.get('systemctl', None):
CHKCONFIG = location['systemctl']
elif 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:
running = False
lines = psout.split("\n")
for line in lines:
if pattern in line and not "pattern=" in line:
# so as to not confuse ./hacking/test-module
running = True
break
# 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
if rc == 2:
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
elif 'dead but subsys locked' in cleanout:
running = False
elif 'dead but 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
# also, systemctl needs the arguments reversed
if enable:
on_off = "on"
enable_disable = "enable"
else:
on_off = "off"
enable_disable = "disable"
if CHKCONFIG.endswith("update-rc.d"):
args = (CHKCONFIG, name, enable_disable)
elif CHKCONFIG.endswith("systemctl"):
args = (CHKCONFIG, enable_disable, name + ".service")
else:
args = (CHKCONFIG, name, on_off)
if enable is not None:
rc, stdout, stderr = _run("%s %s %s" % args)
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))
if rc1 != 0 and rc2 == 0:
rc_state = rc + rc2
stdout = stdout2
stderr = stderr2
else:
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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