ansible/library/service

#!/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 os
import sys
import shlex
import subprocess

# ===========================================
# convert arguments of form a=b c=d
# to a dictionary
# FIXME: make more idiomatic


if len(sys.argv) == 1:
    print json.dumps({
        "failed" : True,
        "msg"    : "the command module requires arguments (-a)"
    })
    sys.exit(1)

argfile = sys.argv[1]
if not os.path.exists(argfile):
    print json.dumps({
        "failed" : True,
        "msg"    : "Argument file not found"
    })
    sys.exit(1)

args = open(argfile, 'r').read()
itmes = shlex.split(args)

if not len(items):
    print json.dumps({
        "failed" : True,
        "msg"    : "the command module requires arguments (-a)"
    })
    sys.exit(1)


params = {}
for x in items:
    (k, v) = x.split("=")
    params[k] = v

name = params['name']
state = params.get('state','running')

# ===========================================
# get service status

status = os.popen("/sbin/service %s status" % name).read()

# ===========================================
# determine if we are going to change anything

running = False
if status.find("not running") != -1:
    running = False
elif status.find("running") != -1:
    running = True
elif name == 'iptables' and status.find("ACCEPT") != -1:
    # iptables status command output is lame
    # TODO: lookup if we can use a return code for this instead?
    running = True

changed = False
if not running and state == "started":
    changed = True
elif running and state == "stopped":
    changed = True
elif state == "restarted":
    changed = True

# ===========================================
# run change commands if we need to

def _run(cmd):
    return subprocess.call(cmd, 
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE, shell=True)


rc = 0
if changed:
    if state == 'started':
        rc = _run("/sbin/service %s start" %  name)
    elif state == 'stopped':
        rc = _run("/sbin/service %s stop" % name)
    elif state == 'restarted':
        rc1 = _run("/sbin/service %s stop" % name)
        rc2 = _run("/sbin/service %s start" % name)
        rc  = rc1 and rc2

if rc != 0:
    # yeah, should probably include output of failure...
    print json.dumps({
        "failed" : 1,
        "rc"     : rc
    })
    sys.exit(1)

# ===============================================
# success

print json.dumps({
   "changed" : changed
})