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ansible/system/svc.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# (c) 2015, Brian Coca <bcoca@ansible.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: svc
author: "Brian Coca (@bcoca)"
version_added: "1.9"
short_description: Manage daemontools services.
description:
- Controls daemontools services on remote hosts using the svc utility.
options:
name:
required: true
description:
- Name of the service to manage.
state:
required: false
choices: [ started, stopped, restarted, reloaded, once ]
description:
- C(Started)/C(stopped) are idempotent actions that will not run
commands unless necessary. C(restarted) will always bounce the
svc (svc -t) and C(killed) will always bounce the svc (svc -k).
C(reloaded) will send a sigusr1 (svc -1).
C(once) will run a normally downed svc once (svc -o), not really
an idempotent operation.
downed:
required: false
choices: [ "yes", "no" ]
default: no
description:
- Should a 'down' file exist or not, if it exists it disables auto startup.
defaults to no. Downed does not imply stopped.
enabled:
required: false
choices: [ "yes", "no" ]
description:
- Wheater the service is enabled or not, if disabled it also implies stopped.
Make note that a service can be enabled and downed (no auto restart).
service_dir:
required: false
default: /service
description:
- directory svscan watches for services
service_src:
required: false
description:
- directory where services are defined, the source of symlinks to service_dir.
'''
EXAMPLES = '''
# Example action to start svc dnscache, if not running
- svc: name=dnscache state=started
# Example action to stop svc dnscache, if running
- svc: name=dnscache state=stopped
# Example action to kill svc dnscache, in all cases
- svc : name=dnscache state=killed
# Example action to restart svc dnscache, in all cases
- svc : name=dnscache state=restarted
# Example action to reload svc dnscache, in all cases
- svc: name=dnscache state=reloaded
# Example using alt svc directory location
- svc: name=dnscache state=reloaded service_dir=/var/service
'''
import platform
import shlex
from ansible.module_utils.pycompat24 import get_exception
from ansible.module_utils.basic import *
def _load_dist_subclass(cls, *args, **kwargs):
'''
Used for derivative implementations
'''
subclass = None
distro = kwargs['module'].params['distro']
# get the most specific superclass for this platform
if distro is not None:
for sc in cls.__subclasses__():
if sc.distro is not None and sc.distro == distro:
subclass = sc
if subclass is None:
subclass = cls
return super(cls, subclass).__new__(subclass)
class Svc(object):
"""
Main class that handles daemontools, can be subclassed and overriden in case
we want to use a 'derivative' like encore, s6, etc
"""
#def __new__(cls, *args, **kwargs):
# return _load_dist_subclass(cls, args, kwargs)
def __init__(self, module):
self.extra_paths = [ '/command', '/usr/local/bin' ]
self.report_vars = ['state', 'enabled', 'downed', 'svc_full', 'src_full', 'pid', 'duration', 'full_state']
self.module = module
self.name = module.params['name']
self.service_dir = module.params['service_dir']
self.service_src = module.params['service_src']
self.enabled = None
self.downed = None
self.full_state = None
self.state = None
self.pid = None
self.duration = None
self.svc_cmd = module.get_bin_path('svc', opt_dirs=self.extra_paths)
self.svstat_cmd = module.get_bin_path('svstat', opt_dirs=self.extra_paths)
self.svc_full = '/'.join([ self.service_dir, self.name ])
self.src_full = '/'.join([ self.service_src, self.name ])
self.enabled = os.path.lexists(self.svc_full)
if self.enabled:
self.downed = os.path.lexists('%s/down' % self.svc_full)
self.get_status()
else:
self.downed = os.path.lexists('%s/down' % self.src_full)
self.state = 'stopped'
def enable(self):
if os.path.exists(self.src_full):
try:
os.symlink(self.src_full, self.svc_full)
except OSError:
e = get_exception()
self.module.fail_json(path=self.src_full, msg='Error while linking: %s' % str(e))
else:
self.module.fail_json(msg="Could not find source for service to enable (%s)." % self.src_full)
def disable(self):
try:
os.unlink(self.svc_full)
except OSError:
e = get_exception()
self.module.fail_json(path=self.svc_full, msg='Error while unlinking: %s' % str(e))
self.execute_command([self.svc_cmd,'-dx',self.src_full])
src_log = '%s/log' % self.src_full
if os.path.exists(src_log):
self.execute_command([self.svc_cmd,'-dx',src_log])
def get_status(self):
(rc, out, err) = self.execute_command([self.svstat_cmd, self.svc_full])
if err is not None and err:
self.full_state = self.state = err
else:
self.full_state = out
m = re.search('\(pid (\d+)\)', out)
if m:
self.pid = m.group(1)
m = re.search('(\d+) seconds', out)
if m:
self.duration = m.group(1)
if re.search(' up ', out):
self.state = 'start'
elif re.search(' down ', out):
self.state = 'stopp'
else:
self.state = 'unknown'
return
if re.search(' want ', out):
self.state += 'ing'
else:
self.state += 'ed'
def start(self):
return self.execute_command([self.svc_cmd, '-u', self.svc_full])
def stopp(self):
return self.stop()
def stop(self):
return self.execute_command([self.svc_cmd, '-d', self.svc_full])
def once(self):
return self.execute_command([self.svc_cmd, '-o', self.svc_full])
def reload(self):
return self.execute_command([self.svc_cmd, '-1', self.svc_full])
def restart(self):
return self.execute_command([self.svc_cmd, '-t', self.svc_full])
def kill(self):
return self.execute_command([self.svc_cmd, '-k', self.svc_full])
def execute_command(self, cmd):
try:
(rc, out, err) = self.module.run_command(' '.join(cmd))
except Exception:
e = get_exception()
self.module.fail_json(msg="failed to execute: %s" % str(e))
return (rc, out, err)
def report(self):
self.get_status()
states = {}
for k in self.report_vars:
states[k] = self.__dict__[k]
return states
# ===========================================
# Main control flow
def main():
module = AnsibleModule(
argument_spec = dict(
name = dict(required=True),
state = dict(choices=['started', 'stopped', 'restarted', 'killed', 'reloaded', 'once']),
enabled = dict(required=False, type='bool'),
downed = dict(required=False, type='bool'),
dist = dict(required=False, default='daemontools'),
service_dir = dict(required=False, default='/service'),
service_src = dict(required=False, default='/etc/service'),
),
supports_check_mode=True,
)
module.run_command_environ_update = dict(LANG='C', LC_ALL='C', LC_MESSAGES='C', LC_CTYPE='C')
state = module.params['state']
enabled = module.params['enabled']
downed = module.params['downed']
svc = Svc(module)
changed = False
orig_state = svc.report()
if enabled is not None and enabled != svc.enabled:
changed = True
if not module.check_mode:
try:
if enabled:
svc.enable()
else:
svc.disable()
except (OSError, IOError):
e = get_exception()
module.fail_json(msg="Could change service link: %s" % str(e))
if state is not None and state != svc.state:
changed = True
if not module.check_mode:
getattr(svc,state[:-2])()
if downed is not None and downed != svc.downed:
changed = True
if not module.check_mode:
d_file = "%s/down" % svc.svc_full
try:
if downed:
open(d_file, "a").close()
else:
os.unlink(d_file)
except (OSError, IOError):
e = get_exception()
module.fail_json(msg="Could change downed file: %s " % (str(e)))
module.exit_json(changed=changed, svc=svc.report())
main()
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