ansible/service

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#!/usr/bin/python
# (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/>.
try:
import json
except ImportError:
import simplejson as json
import sys
import shlex
import subprocess
import os.path
import syslog
# TODO: switch to fail_json and other helper functions
# like other modules are using
# ===========================================
SERVICE = None
CHKCONFIG = None
def fail_json(d):
print json.dumps(d)
sys.exit(1)
def _find_binaries():
# list of possible paths for service/chkconfig binaries
# with the most probable first
global CHKCONFIG
global SERVICE
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:
fail_json(dict(failed=True, msg='unable to find chkconfig or update-rc.d binary'))
if location.get('service', None):
SERVICE = location['service']
else:
fail_json(dict(failed=True, msg='unable to find service binary'))
if location.get('initctl', None):
INITCTL = location['initctl']
else:
INITCTL = None
def _get_service_status(name):
rc, status_stdout, status_stderr = _run("%s %s status" % (SERVICE, name))
status = status_stdout + status_stderr
# set the running state to None because we don't know it yet
running = None
# Check if we got upstart on the system and then the job state
if INITCTL != 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
cleaned_status_stdout = status_stdout.lower().replace(name.lower(),'')
if cleaned_status_stdout.find("stop") != -1:
running = False
elif cleaned_status_stdout.find("run") != -1 and cleaned_status_stdout.find("not") != -1:
running = False
elif cleaned_status_stdout.find("run") != -1 and cleaned_status_stdout.find("not") == -1:
running = True
elif cleaned_status_stdout.find("start") != -1 and cleaned_status_stdout.find("not") == -1:
running = True
elif 'could not access pid file' in cleaned_status_stdout:
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.lower() in ['on', 'true', 'yes', 'enable']:
rc, stdout, stderr = _run("%s %s %s" % (CHKCONFIG, name, valid_argument['on']))
elif enable.lower() in ['off', 'false', 'no', 'disable']:
rc, stdout, stderr = _run("%s %s %s" % (CHKCONFIG, name, valid_argument['off']))
return rc, stdout, stderr
argfile = sys.argv[1]
args = open(argfile, 'r').read()
items = shlex.split(args)
syslog.openlog('ansible-%s' % os.path.basename(__file__))
syslog.syslog(syslog.LOG_NOTICE, 'Invoked with %s' % args)
if not len(items):
fail_json(dict(failed=True, msg='this module requires arguments (-a)'))
params = {}
for arg in items:
if "=" not in arg:
fail_json(dict(failed=True, msg='expected key=value format arguments'))
(name, value) = arg.split("=")
params[name] = value
name = params.get('name', None)
if name is None:
fail_json(dict(failed=True, msg='missing name'))
state = params.get('state', None)
list_items = params.get('list', None)
enable = params.get('enabled', params.get('enable', None))
# running and started are the same
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if state and state.lower() not in [ 'running', 'started', 'stopped', 'restarted','reloaded' ]:
fail_json(dict(failed=True, msg='invalid value for state'))
if list_items and list_items.lower() not in [ 'status' ]:
fail_json(dict(failed=True, msg='invalid value for list'))
if enable and enable.lower() not in [ 'on', 'off', 'true', 'false', 'yes', 'no', 'enable', 'disable' ]:
fail_json(dict(failed=True, msg='invalid value for enable'))
# ===========================================
# find binaries locations on minion
_find_binaries()
# ===========================================
# get service status
running = _get_service_status(name)
if state or enable:
rc = 0
out = ''
err = ''
changed = False
if enable:
rc_enable, out_enable, err_enable = _do_enable(name, enable)
rc += rc_enable
out += out_enable
err += err_enable
if state and running == None:
print json.dumps({
"failed" : True,
"msg" : "failed determining the current service state => state stays unchanged",
})
print >> sys.stderr, out + err
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
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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))
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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:
print json.dumps({
"failed" : 1,
"rc" : rc,
})
print >> sys.stderr, out + err
sys.exit(1)
# ===============================================
# success
result = {"changed": changed}
rc, stdout, stderr = _run("%s %s status" % (SERVICE, name))
if list_items and list_items in [ 'status' ]:
result['status'] = stdout
print json.dumps(result)
elif list_items is not None:
# solo list=status mode, don't change anything, just return
# suitable for /usr/bin/ansible usage or API, playbooks
# not so much
print json.dumps({
"status" : status
})
else:
print json.dumps(dict(failed=True, msg="expected state or list parameters"))
sys.exit(0)