Add service option to avoid failure on missing service

This adds a must_exist option to the service module, which gives callers the
ability to be tolerant to services that do not exist. This allows for
opportunistic manipulation of a list of services if they happen to exist on the
host. While failed_when could be used, it's difficult to track all the
different error strings that might come from various service tools regarding a
missing service.
This commit is contained in:
Jesse Keating 2015-02-05 15:23:35 -08:00 committed by Matt Clay
parent af689dece3
commit 17aabee6df

View file

@ -72,6 +72,14 @@ options:
description:
- Additional arguments provided on the command line
aliases: [ 'args' ]
must_exist:
required: false
default: true
version_added: "1.9"
description:
- Avoid a module failure if the named service does not exist. Useful
for opportunistically starting/stopping/restarting a list of
potential services.
'''
EXAMPLES = '''
@ -95,6 +103,9 @@ EXAMPLES = '''
# Example action to restart network service for interface eth0
- service: name=network state=restarted args=eth0
# Example action to restart nova-compute if it exists
- service: name=nova-compute state=restarted must_exist=no
'''
import platform
@ -469,7 +480,11 @@ class LinuxService(Service):
self.enable_cmd = location['chkconfig']
if self.enable_cmd is None:
self.module.fail_json(msg="no service or tool found for: %s" % self.name)
if self.module.params['must_exist']:
self.module.fail_json(msg="no service or tool found for: %s" % self.name)
else:
# exiting without change on non-existent service
self.module.exit_json(changed=False, exists=False)
# If no service control tool selected yet, try to see if 'service' is available
if self.svc_cmd is None and location.get('service', False):
@ -477,7 +492,11 @@ class LinuxService(Service):
# couldn't find anything yet
if self.svc_cmd is None and not self.svc_initscript:
self.module.fail_json(msg='cannot find \'service\' binary or init script for service, possible typo in service name?, aborting')
if self.module.params['must_exist']:
self.module.fail_json(msg='cannot find \'service\' binary or init script for service, possible typo in service name?, aborting')
else:
# exiting without change on non-existent service
self.module.exit_json(changed=False, exists=False)
if location.get('initctl', False):
self.svc_initctl = location['initctl']
@ -1398,6 +1417,7 @@ def main():
enabled = dict(type='bool'),
runlevel = dict(required=False, default='default'),
arguments = dict(aliases=['args'], default=''),
must_exist = dict(type='bool', default=True),
),
supports_check_mode=True
)