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homeserver/ansible_collections/community/general/plugins/modules/system/nosh.py
mg c648a48c4c systemd: sanoid (#346) 
Co-authored-by: Michael Grote <michael.grote@posteo.de>
Reviewed-on: mg/ansible#346
Co-authored-by: mg <michael.grote@posteo.de>
Co-committed-by: mg <michael.grote@posteo.de>
2022-04-03 11:04:27 +02:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2017, Thomas Caravia <taca@kadisius.eu>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = '''
---
module: nosh
author:
- "Thomas Caravia (@tacatac)"
short_description: Manage services with nosh
description:
- Control running and enabled state for system-wide or user services.
- BSD and Linux systems are supported.
options:
name:
type: str
required: true
description:
- Name of the service to manage.
state:
type: str
required: false
choices: [ started, stopped, reset, restarted, reloaded ]
description:
- C(started)/C(stopped) are idempotent actions that will not run
commands unless necessary.
C(restarted) will always bounce the service.
C(reloaded) will send a SIGHUP or start the service.
C(reset) will start or stop the service according to whether it is
enabled or not.
enabled:
required: false
type: bool
description:
- Enable or disable the service, independently of C(*.preset) file
preference or running state. Mutually exclusive with I(preset). Will take
effect prior to I(state=reset).
preset:
required: false
type: bool
description:
- Enable or disable the service according to local preferences in C(*.preset) files.
Mutually exclusive with I(enabled). Only has an effect if set to true. Will take
effect prior to I(state=reset).
user:
required: false
default: 'no'
type: bool
description:
- Run system-control talking to the calling user's service manager, rather than
the system-wide service manager.
requirements:
- A system with an active nosh service manager, see Notes for further information.
notes:
- Information on the nosh utilities suite may be found at U(https://jdebp.eu/Softwares/nosh/).
'''
EXAMPLES = '''
- name: Start dnscache if not running
community.general.nosh: name=dnscache state=started
- name: Stop mpd, if running
community.general.nosh: name=mpd state=stopped
- name: Restart unbound or start it if not already running
community.general.nosh:
name: unbound
state: restarted
- name: Reload fail2ban or start it if not already running
community.general.nosh:
name: fail2ban
state: reloaded
- name: Disable nsd
community.general.nosh: name=nsd enabled=no
- name: For package installers, set nginx running state according to local enable settings, preset and reset
community.general.nosh: name=nginx preset=True state=reset
- name: Reboot the host if nosh is the system manager, would need a "wait_for*" task at least, not recommended as-is
community.general.nosh: name=reboot state=started
- name: Using conditionals with the module facts
tasks:
- name: Obtain information on tinydns service
community.general.nosh: name=tinydns
register: result
- name: Fail if service not loaded
ansible.builtin.fail: msg="The {{ result.name }} service is not loaded"
when: not result.status
- name: Fail if service is running
ansible.builtin.fail: msg="The {{ result.name }} service is running"
when: result.status and result.status['DaemontoolsEncoreState'] == "running"
'''
RETURN = '''
name:
description: name used to find the service
returned: success
type: str
sample: "sshd"
service_path:
description: resolved path for the service
returned: success
type: str
sample: "/var/sv/sshd"
enabled:
description: whether the service is enabled at system bootstrap
returned: success
type: bool
sample: True
preset:
description: whether the enabled status reflects the one set in the relevant C(*.preset) file
returned: success
type: bool
sample: 'False'
state:
description: service process run state, C(None) if the service is not loaded and will not be started
returned: if state option is used
type: str
sample: "reloaded"
status:
description: a dictionary with the key=value pairs returned by `system-control show-json` or C(None) if the service is not loaded
returned: success
type: complex
contains:
After:
description: [] # FIXME
returned: success
type: list
sample: ["/etc/service-bundles/targets/basic","../sshdgenkeys", "log"]
Before:
description: [] # FIXME
returned: success
type: list
sample: ["/etc/service-bundles/targets/shutdown"]
Conflicts:
description: [] # FIXME
returned: success
type: list
sample: '[]'
DaemontoolsEncoreState:
description: [] # FIXME
returned: success
type: str
sample: "running"
DaemontoolsState:
description: [] # FIXME
returned: success
type: str
sample: "up"
Enabled:
description: [] # FIXME
returned: success
type: bool
sample: True
LogService:
description: [] # FIXME
returned: success
type: str
sample: "../cyclog@sshd"
MainPID:
description: [] # FIXME
returned: success
type: int
sample: 661
Paused:
description: [] # FIXME
returned: success
type: bool
sample: 'False'
ReadyAfterRun:
description: [] # FIXME
returned: success
type: bool
sample: 'False'
RemainAfterExit:
description: [] # FIXME
returned: success
type: bool
sample: 'False'
Required-By:
description: [] # FIXME
returned: success
type: list
sample: '[]'
RestartExitStatusCode:
description: [] # FIXME
returned: success
type: int
sample: '0'
RestartExitStatusNumber:
description: [] # FIXME
returned: success
type: int
sample: '0'
RestartTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 4611686019935648081
RestartUTCTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 1508260140
RunExitStatusCode:
description: [] # FIXME
returned: success
type: int
sample: '0'
RunExitStatusNumber:
description: [] # FIXME
returned: success
type: int
sample: '0'
RunTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 4611686019935648081
RunUTCTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 1508260140
StartExitStatusCode:
description: [] # FIXME
returned: success
type: int
sample: 1
StartExitStatusNumber:
description: [] # FIXME
returned: success
type: int
sample: '0'
StartTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 4611686019935648081
StartUTCTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 1508260140
StopExitStatusCode:
description: [] # FIXME
returned: success
type: int
sample: '0'
StopExitStatusNumber:
description: [] # FIXME
returned: success
type: int
sample: '0'
StopTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 4611686019935648081
StopUTCTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 1508260140
Stopped-By:
description: [] # FIXME
returned: success
type: list
sample: ["/etc/service-bundles/targets/shutdown"]
Timestamp:
description: [] # FIXME
returned: success
type: int
sample: 4611686019935648081
UTCTimestamp:
description: [] # FIXME
returned: success
type: int
sample: 1508260140
Want:
description: [] # FIXME
returned: success
type: str
sample: "nothing"
Wanted-By:
description: [] # FIXME
returned: success
type: list
sample: ["/etc/service-bundles/targets/server","/etc/service-bundles/targets/sockets"]
Wants:
description: [] # FIXME
returned: success
type: list
sample: ["/etc/service-bundles/targets/basic","../sshdgenkeys"]
user:
description: whether the user-level service manager is called
returned: success
type: bool
sample: False
'''
import json
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.service import fail_if_missing
from ansible.module_utils.common.text.converters import to_native
def run_sys_ctl(module, args):
sys_ctl = [module.get_bin_path('system-control', required=True)]
if module.params['user']:
sys_ctl = sys_ctl + ['--user']
return module.run_command(sys_ctl + args)
def get_service_path(module, service):
(rc, out, err) = run_sys_ctl(module, ['find', service])
# fail if service not found
if rc != 0:
fail_if_missing(module, False, service, msg='host')
else:
return to_native(out).strip()
def service_is_enabled(module, service_path):
(rc, out, err) = run_sys_ctl(module, ['is-enabled', service_path])
return rc == 0
def service_is_preset_enabled(module, service_path):
(rc, out, err) = run_sys_ctl(module, ['preset', '--dry-run', service_path])
return to_native(out).strip().startswith("enable")
def service_is_loaded(module, service_path):
(rc, out, err) = run_sys_ctl(module, ['is-loaded', service_path])
return rc == 0
def get_service_status(module, service_path):
(rc, out, err) = run_sys_ctl(module, ['show-json', service_path])
# will fail if not service is not loaded
if err is not None and err:
module.fail_json(msg=err)
else:
json_out = json.loads(to_native(out).strip())
status = json_out[service_path] # descend past service path header
return status
def service_is_running(service_status):
return service_status['DaemontoolsEncoreState'] in set(['starting', 'started', 'running'])
def handle_enabled(module, result, service_path):
"""Enable or disable a service as needed.
- 'preset' will set the enabled state according to available preset file settings.
- 'enabled' will set the enabled state explicitly, independently of preset settings.
These options are set to "mutually exclusive" but the explicit 'enabled' option will
have priority if the check is bypassed.
"""
# computed prior in control flow
preset = result['preset']
enabled = result['enabled']
# preset, effect only if option set to true (no reverse preset)
if module.params['preset']:
action = 'preset'
# run preset if needed
if preset != module.params['preset']:
result['changed'] = True
if not module.check_mode:
(rc, out, err) = run_sys_ctl(module, [action, service_path])
if rc != 0:
module.fail_json(msg="Unable to %s service %s: %s" % (action, service_path, out + err))
result['preset'] = not preset
result['enabled'] = not enabled
# enabled/disabled state
if module.params['enabled'] is not None:
if module.params['enabled']:
action = 'enable'
else:
action = 'disable'
# change enable/disable if needed
if enabled != module.params['enabled']:
result['changed'] = True
if not module.check_mode:
(rc, out, err) = run_sys_ctl(module, [action, service_path])
if rc != 0:
module.fail_json(msg="Unable to %s service %s: %s" % (action, service_path, out + err))
result['enabled'] = not enabled
result['preset'] = not preset
def handle_state(module, result, service_path):
"""Set service running state as needed.
Takes into account the fact that a service may not be loaded (no supervise directory) in
which case it is 'stopped' as far as the service manager is concerned. No status information
can be obtained and the service can only be 'started'.
"""
# default to desired state, no action
result['state'] = module.params['state']
state = module.params['state']
action = None
# computed prior in control flow, possibly modified by handle_enabled()
enabled = result['enabled']
# service not loaded -> not started by manager, no status information
if not service_is_loaded(module, service_path):
if state in ['started', 'restarted', 'reloaded']:
action = 'start'
result['state'] = 'started'
elif state == 'reset':
if enabled:
action = 'start'
result['state'] = 'started'
else:
result['state'] = None
else:
result['state'] = None
# service is loaded
else:
# get status information
result['status'] = get_service_status(module, service_path)
running = service_is_running(result['status'])
if state == 'started':
if not running:
action = 'start'
elif state == 'stopped':
if running:
action = 'stop'
# reset = start/stop according to enabled status
elif state == 'reset':
if enabled is not running:
if running:
action = 'stop'
result['state'] = 'stopped'
else:
action = 'start'
result['state'] = 'started'
# start if not running, 'service' module constraint
elif state == 'restarted':
if not running:
action = 'start'
result['state'] = 'started'
else:
action = 'condrestart'
# start if not running, 'service' module constraint
elif state == 'reloaded':
if not running:
action = 'start'
result['state'] = 'started'
else:
action = 'hangup'
# change state as needed
if action:
result['changed'] = True
if not module.check_mode:
(rc, out, err) = run_sys_ctl(module, [action, service_path])
if rc != 0:
module.fail_json(msg="Unable to %s service %s: %s" % (action, service_path, err))
# ===========================================
# Main control flow
def main():
module = AnsibleModule(
argument_spec=dict(
name=dict(type='str', required=True),
state=dict(type='str', choices=['started', 'stopped', 'reset', 'restarted', 'reloaded']),
enabled=dict(type='bool'),
preset=dict(type='bool'),
user=dict(type='bool', default=False),
),
supports_check_mode=True,
mutually_exclusive=[['enabled', 'preset']],
)
service = module.params['name']
rc = 0
out = err = ''
result = {
'name': service,
'changed': False,
'status': None,
}
# check service can be found (or fail) and get path
service_path = get_service_path(module, service)
# get preliminary service facts
result['service_path'] = service_path
result['user'] = module.params['user']
result['enabled'] = service_is_enabled(module, service_path)
result['preset'] = result['enabled'] is service_is_preset_enabled(module, service_path)
# set enabled state, service need not be loaded
if module.params['enabled'] is not None or module.params['preset']:
handle_enabled(module, result, service_path)
# set service running state
if module.params['state'] is not None:
handle_state(module, result, service_path)
# get final service status if possible
if service_is_loaded(module, service_path):
result['status'] = get_service_status(module, service_path)
module.exit_json(**result)
if __name__ == '__main__':
main()
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