summaryrefslogtreecommitdiff
path: root/system/systemd.py
blob: d835b85ff13c1d6ea2d8ccbbe921543e3c6f96f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2016, 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: systemd
author:
    - "Ansible Core Team"
version_added: "2.2"
short_description:  Manage services.
description:
    - Controls systemd services on remote hosts.
options:
    name:
        required: true
        description:
            - Name of the service.
        aliases: ['unit', 'service']
    state:
        required: false
        default: null
        choices: [ 'started', 'stopped', '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 always reload.
    enabled:
        required: false
        choices: [ "yes", "no" ]
        default: null
        description:
            - Whether the service should start on boot. B(At least one of state and enabled are required.)
    masked:
        required: false
        choices: [ "yes", "no" ]
        default: null
        description:
            - Whether the unit should be masked or not, a masked unit is impossible to start.
    daemon_reload:
        required: false
        default: no
        choices: [ "yes", "no" ]
        description:
            - run daemon-reload before doing any other operations, to make sure systemd has read any changes.
        aliases: ['daemon-reload']
    user:
        required: false
        default: no
        choices: [ "yes", "no" ]
        description:
            - run systemctl talking to the service manager of the calling user, rather than the service manager
              of the system.
notes:
    - One option other than name is required.
requirements:
    - A system managed by systemd
'''

EXAMPLES = '''
# Example action to start service httpd, if not running
- systemd: state=started name=httpd

# Example action to stop service cron on debian, if running
- systemd: name=cron state=stopped

# Example action to restart service cron on centos, in all cases, also issue daemon-reload to pick up config changes
- systemd:
    state: restarted
    daemon_reload: yes
    name: crond

# Example action to reload service httpd, in all cases
- systemd:
    name: httpd
    state: reloaded

# Example action to enable service httpd and ensure it is not masked
- systemd:
    name: httpd
    enabled: yes
    masked: no

# Example action to enable a timer for dnf-automatic
- systemd:
    name: dnf-automatic.timer
    state: started
    enabled: True
'''

RETURN = '''
status:
    description: A dictionary with the key=value pairs returned from `systemctl show`
    returned: success
    type: complex
    sample: {
            "ActiveEnterTimestamp": "Sun 2016-05-15 18:28:49 EDT",
            "ActiveEnterTimestampMonotonic": "8135942",
            "ActiveExitTimestampMonotonic": "0",
            "ActiveState": "active",
            "After": "auditd.service systemd-user-sessions.service time-sync.target systemd-journald.socket basic.target system.slice",
            "AllowIsolate": "no",
            "Before": "shutdown.target multi-user.target",
            "BlockIOAccounting": "no",
            "BlockIOWeight": "1000",
            "CPUAccounting": "no",
            "CPUSchedulingPolicy": "0",
            "CPUSchedulingPriority": "0",
            "CPUSchedulingResetOnFork": "no",
            "CPUShares": "1024",
            "CanIsolate": "no",
            "CanReload": "yes",
            "CanStart": "yes",
            "CanStop": "yes",
            "CapabilityBoundingSet": "18446744073709551615",
            "ConditionResult": "yes",
            "ConditionTimestamp": "Sun 2016-05-15 18:28:49 EDT",
            "ConditionTimestampMonotonic": "7902742",
            "Conflicts": "shutdown.target",
            "ControlGroup": "/system.slice/crond.service",
            "ControlPID": "0",
            "DefaultDependencies": "yes",
            "Delegate": "no",
            "Description": "Command Scheduler",
            "DevicePolicy": "auto",
            "EnvironmentFile": "/etc/sysconfig/crond (ignore_errors=no)",
            "ExecMainCode": "0",
            "ExecMainExitTimestampMonotonic": "0",
            "ExecMainPID": "595",
            "ExecMainStartTimestamp": "Sun 2016-05-15 18:28:49 EDT",
            "ExecMainStartTimestampMonotonic": "8134990",
            "ExecMainStatus": "0",
            "ExecReload": "{ path=/bin/kill ; argv[]=/bin/kill -HUP $MAINPID ; ignore_errors=no ; start_time=[n/a] ; stop_time=[n/a] ; pid=0 ; code=(null) ; status=0/0 }",
            "ExecStart": "{ path=/usr/sbin/crond ; argv[]=/usr/sbin/crond -n $CRONDARGS ; ignore_errors=no ; start_time=[n/a] ; stop_time=[n/a] ; pid=0 ; code=(null) ; status=0/0 }",
            "FragmentPath": "/usr/lib/systemd/system/crond.service",
            "GuessMainPID": "yes",
            "IOScheduling": "0",
            "Id": "crond.service",
            "IgnoreOnIsolate": "no",
            "IgnoreOnSnapshot": "no",
            "IgnoreSIGPIPE": "yes",
            "InactiveEnterTimestampMonotonic": "0",
            "InactiveExitTimestamp": "Sun 2016-05-15 18:28:49 EDT",
            "InactiveExitTimestampMonotonic": "8135942",
            "JobTimeoutUSec": "0",
            "KillMode": "process",
            "KillSignal": "15",
            "LimitAS": "18446744073709551615",
            "LimitCORE": "18446744073709551615",
            "LimitCPU": "18446744073709551615",
            "LimitDATA": "18446744073709551615",
            "LimitFSIZE": "18446744073709551615",
            "LimitLOCKS": "18446744073709551615",
            "LimitMEMLOCK": "65536",
            "LimitMSGQUEUE": "819200",
            "LimitNICE": "0",
            "LimitNOFILE": "4096",
            "LimitNPROC": "3902",
            "LimitRSS": "18446744073709551615",
            "LimitRTPRIO": "0",
            "LimitRTTIME": "18446744073709551615",
            "LimitSIGPENDING": "3902",
            "LimitSTACK": "18446744073709551615",
            "LoadState": "loaded",
            "MainPID": "595",
            "MemoryAccounting": "no",
            "MemoryLimit": "18446744073709551615",
            "MountFlags": "0",
            "Names": "crond.service",
            "NeedDaemonReload": "no",
            "Nice": "0",
            "NoNewPrivileges": "no",
            "NonBlocking": "no",
            "NotifyAccess": "none",
            "OOMScoreAdjust": "0",
            "OnFailureIsolate": "no",
            "PermissionsStartOnly": "no",
            "PrivateNetwork": "no",
            "PrivateTmp": "no",
            "RefuseManualStart": "no",
            "RefuseManualStop": "no",
            "RemainAfterExit": "no",
            "Requires": "basic.target",
            "Restart": "no",
            "RestartUSec": "100ms",
            "Result": "success",
            "RootDirectoryStartOnly": "no",
            "SameProcessGroup": "no",
            "SecureBits": "0",
            "SendSIGHUP": "no",
            "SendSIGKILL": "yes",
            "Slice": "system.slice",
            "StandardError": "inherit",
            "StandardInput": "null",
            "StandardOutput": "journal",
            "StartLimitAction": "none",
            "StartLimitBurst": "5",
            "StartLimitInterval": "10000000",
            "StatusErrno": "0",
            "StopWhenUnneeded": "no",
            "SubState": "running",
            "SyslogLevelPrefix": "yes",
            "SyslogPriority": "30",
            "TTYReset": "no",
            "TTYVHangup": "no",
            "TTYVTDisallocate": "no",
            "TimeoutStartUSec": "1min 30s",
            "TimeoutStopUSec": "1min 30s",
            "TimerSlackNSec": "50000",
            "Transient": "no",
            "Type": "simple",
            "UMask": "0022",
            "UnitFileState": "enabled",
            "WantedBy": "multi-user.target",
            "Wants": "system.slice",
            "WatchdogTimestampMonotonic": "0",
            "WatchdogUSec": "0",
        }
'''

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.service import sysv_exists, sysv_is_enabled, fail_if_missing
from ansible.module_utils._text import to_native

# ===========================================
# Main control flow

def main():
    # initialize
    module = AnsibleModule(
        argument_spec = dict(
                name = dict(required=True, type='str', aliases=['unit', 'service']),
                state = dict(choices=[ 'started', 'stopped', 'restarted', 'reloaded'], type='str'),
                enabled = dict(type='bool'),
                masked = dict(type='bool'),
                daemon_reload= dict(type='bool', default=False, aliases=['daemon-reload']),
                user= dict(type='bool', default=False),
            ),
            supports_check_mode=True,
            required_one_of=[['state', 'enabled', 'masked', 'daemon_reload']],
        )

    systemctl = module.get_bin_path('systemctl')
    if module.params['user']:
        systemctl = systemctl + " --user"
    unit = module.params['name']
    rc = 0
    out = err = ''
    result = {
        'name':  unit,
        'changed': False,
        'status': {},
        'warnings': [],
    }

    # Run daemon-reload first, if requested
    if module.params['daemon_reload']:
        (rc, out, err) = module.run_command("%s daemon-reload" % (systemctl))
        if rc != 0:
            module.fail_json(msg='failure %d during daemon-reload: %s' % (rc, err))

    found = False
    is_initd = sysv_exists(unit)
    is_systemd = False

    # check service data, cannot error out on rc as it changes across versions, assume not found
    (rc, out, err) = module.run_command("%s show '%s'" % (systemctl, unit))
    if rc == 0:
        # load return of systemctl show into dictionary for easy access and return
        multival = []
        if out:
            k = None
            for line in to_native(out).split('\n'): # systemd can have multiline values delimited with {}
                if line.strip():
                    if k is None:
                        if '=' in line:
                            k,v = line.split('=', 1)
                            if v.lstrip().startswith('{'):
                                if not v.rstrip().endswith('}'):
                                    multival.append(line)
                                    continue
                            result['status'][k] = v.strip()
                            k = None
                    else:
                        if line.rstrip().endswith('}'):
                            result['status'][k] = '\n'.join(multival).strip()
                            multival = []
                            k = None
                        else:
                            multival.append(line)

            is_systemd = 'LoadState' in result['status'] and result['status']['LoadState'] != 'not-found'

            # Check for loading error
            if is_systemd and 'LoadError' in result['status']:
                module.fail_json(msg="Error loading unit file '%s': %s" % (unit, result['status']['LoadError']))

    # Does service exist?
    found = is_systemd or is_initd
    if is_initd and not is_systemd:
        result['warnings'].append('The service (%s) is actually an init script but the system is managed by systemd' % unit)

    # mask/unmask the service, if requested, can operate on services before they are installed
    if module.params['masked'] is not None:
        # state is not masked unless systemd affirms otherwise
        masked = ('LoadState' in result['status'] and result['status']['LoadState'] == 'masked')

        if masked != module.params['masked']:
            result['changed'] = True
            if module.params['masked']:
                action = 'mask'
            else:
                action = 'unmask'

            if not module.check_mode:
                (rc, out, err) = module.run_command("%s %s '%s'" % (systemctl, action, unit))
                if rc != 0:
                    # some versions of system CAN mask/unmask non existing services, we only fail on missing if they don't
                    fail_if_missing(module, found, unit, "cannot %s" % (action))
                    module.fail_json(msg="Unable to %s service %s: %s" % (action, unit, err))


    # Enable/disable service startup at boot if requested
    if module.params['enabled'] is not None:

        if module.params['enabled']:
            action = 'enable'
        else:
            action = 'disable'

        fail_if_missing(module, found, unit, "cannot %s" % (action))

        # do we need to enable the service?
        enabled = False
        (rc, out, err) = module.run_command("%s is-enabled '%s'" % (systemctl, unit))

        # check systemctl result or if it is a init script
        if rc == 0:
            enabled = True
        elif rc == 1:
            # if both init script and unit file exist stdout should have enabled/disabled, otherwise use rc entries
            if is_initd and (not out.startswith('disabled') or sysv_is_enabled(unit)):
                enabled = True

        # default to current state
        result['enabled'] = enabled

        # Change enable/disable if needed
        if enabled != module.params['enabled']:
            result['changed'] = True
            if not module.check_mode:
                (rc, out, err) = module.run_command("%s %s '%s'" % (systemctl, action, unit))
                if rc != 0:
                    module.fail_json(msg="Unable to %s service %s: %s" % (action, unit, out + err))

            result['enabled'] = not enabled

    # set service state if requested
    if module.params['state'] is not None:
        fail_if_missing(module, found, unit, "cannot check nor set state")

        # default to desired state
        result['state'] = module.params['state']

        # What is current service state?
        if 'ActiveState' in result['status']:
            action = None
            if module.params['state'] == 'started':
                if result['status']['ActiveState'] != 'active':
                    action = 'start'
            elif module.params['state'] == 'stopped':
                if result['status']['ActiveState'] == 'active':
                    action = 'stop'
            else:
                action = module.params['state'][:-2] # remove 'ed' from restarted/reloaded
                result['state'] = 'started'

            if action:
                result['changed'] = True
                if not module.check_mode:
                    (rc, out, err) = module.run_command("%s %s '%s'" % (systemctl, action, unit))
                    if rc != 0:
                        module.fail_json(msg="Unable to %s service %s: %s" % (action, unit, err))
        else:
            # this should not happen?
            module.fail_json(msg="Service is in unknown state", status=result['status'])


    module.exit_json(**result)

if __name__ == '__main__':
    main()