A basic service module with 'ensure' idempotence semantics. Playbook updated to use service

module vs command module for restarting.  May be some bugs and requires the service to implement 'status' -- and probably some better error handling (i.e. return JSON with "failed" element if failed).

Improvements welcome.
This commit is contained in:
Michael DeHaan 2012-02-25 20:27:11 -05:00
parent 3c3111c1f3
commit d308254eae
3 changed files with 87 additions and 2 deletions

View file

@ -21,7 +21,7 @@
handlers: handlers:
- do: - do:
- restart apache - restart apache
- command /sbin/service httpd restart - service name=httpd ensure=restarted
- do: - do:
- quack like a duck - quack like a duck
- command /bin/true - command /bin/true

View file

@ -21,7 +21,6 @@
import ansible.runner import ansible.runner
import ansible.constants as C import ansible.constants as C
import json
import yaml import yaml
import shlex import shlex

86
library/service Executable file
View file

@ -0,0 +1,86 @@
#!/usr/bin/python
try:
import json
except ImportError:
import simplejson as json
import os
import sys
import shlex
import subprocess
# ===========================================
# convert arguments of form ensure=running name=foo
# to a dictionary
# FIXME: make more idiomatic
args = " ".join(sys.argv[1:])
items = shlex.split(args)
params = {}
for x in items:
(k, v) = x.split("=")
params[k] = v
name = params['name']
ensure = params.get('ensure','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 ensure == "started":
changed = True
elif running and ensure == "stopped":
changed = True
elif ensure == "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 ensure == 'started':
rc = _run("/sbin/service %s start" % name)
elif ensure == 'stopped':
rc = _run("/sbin/service %s stop" % name)
elif ensure == '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
})
sys.exit(1)
# ===============================================
# success
print json.dumps({
"changed" : changed
})