b64821d543
After helping someone on IRC he was interested to have this debug module in upstream. This module simply 'prints' a message, and can be ordered to fail if needed. It helps to troubleshoot or understand inventory/facts issues and/or experiment with statements and conditions using only_if.
Here is a small example playbook:
```yaml
- hosts: all
tasks:
- local_action: debug msg="System $inventory_hostname has uuid ${ansible_product_uuid}"
- local_action: debug msg="System $inventory_hostname lacks a gateway" fail=yes
only_if: "is_unset('$ansible_default_ipv4.gateway')"
- local_action: debug msg="System $inventory_hostname has gateway ${ansible_default_ipv4.gateway}"
only_if: "is_set('$ansible_default_ipv4.gateway')"
```
outputting:
```
[root@moria ansible]# ansible-playbook -v -l localhost:x220 test6.yml
PLAY [all] *********************
GATHERING FACTS *********************
ok: [localhost]
ok: [x220]
TASK: [debug msg="System $inventory_hostname has uuid $ansible_product_uuid"] *********************
ok: [localhost] => {"msg": "System localhost has uuid d125a48c-364f-4e65-b225-fed42ed61fac"}
ok: [x220] => {"msg": "System x220 has uuid d125a48c-364f-4e65-b225-fed42ed61fac"}
TASK: [debug msg="System $inventory_hostname lacks a gateway" fail=yes] *********************
failed: [localhost] => {"failed": true, "msg": "System localhost lacks a gateway", "rc": 1}
ok: [x220] => {"msg": "System x220 has gateway 192.168.1.1"}
PLAY RECAP *********************
localhost : ok=2 changed=0 unreachable=0 failed=1
x220 : ok=3 changed=0 unreachable=0 failed=0
```
I had some other plans for the module, like displaying host inventory and complete inventory to help understand inventory and facts modules, but that would require an action-plugin for transfering inventory information etc... And I am not sure this is wanted/best done in a module.
81 lines
2.8 KiB
Python
81 lines
2.8 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright 2012 Dag Wieers <dag@wieers.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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DOCUMENTATION = '''
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---
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module: debug
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short_description: Print statements during execution
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description:
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- This module prints statements during execution and can be useful
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for debugging variables or expressions without necessarily halting
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the playbook. Useful for debugging together with the only_if directive.
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In order to see the debug message, you need to run ansible in verbose
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mode (using the -v option).
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version_added: "0.8"
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options:
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msg:
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description:
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- The customized message that is printed. If ommited, prints a generic
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message.
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required: false
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default: "Hello world!"
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rc:
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description:
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- The return code of the module. If fail=yes, this will default to 1.
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required: false
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default: 0
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fail:
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description:
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- A boolean that indicates whether the debug module should fail or not.
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required: false
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default: "no"
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examples:
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- code:
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- local_action: debug msg="System $inventory_hostname has uuid $ansible_product_uuid"
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- local_action: debug msg="System $inventory_hostname lacks a gateway" fail=yes
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only_if: "is_unset('${ansible_default_ipv4.gateway}')"
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- local_action: debug msg="System $inventory_hostname has gateway ${ansible_default_ipv4.gateway}"
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only_if: "is_set('${ansible_default_ipv4.gateway}')"
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description: "Example that prints the loopback address and gateway for each host"
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author: Dag Wieers
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'''
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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fail = dict(default='no', choices=BOOLEANS),
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msg = dict(default='Hello world!'),
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rc = dict(default=0),
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)
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)
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if module.params['fail'] in BOOLEANS_TRUE and module.params['rc'] == 0:
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module.params['rc'] = 1
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if module.params['fail'] in BOOLEANS_TRUE:
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module.fail_json(rc=module.params['rc'], msg=module.params['msg'])
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else:
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module.exit_json(msg=module.params['msg'])
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# this is magic, see lib/ansible/module_common.py
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#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
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main()
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