And this is all I wanted:
# ansible-playbook -l offline -i hosts.cfg test.yml
./test.yml:
- hosts: all
pre_tasks:
# Test if there was a previous source installation of KMS
- name: Test if there was a KMS source installation running before
stat:
path: ~/.kms_installed_from_source
register: kms_trace
vars:
kms_installed_from_source: '{{ true if (kms_trace.stat.exists) else false
}}'
tasks:
- name: Copy config file, when kms_installed_from_source is defined
tags: copy
template:
src: templates/test.j2
dest: test.cfg
when: kms_installed_from_source
- name: Copy config file, when kms_installed_from_source is not defined
tags: copy
template:
src: templates/test.j2
dest: test.cfg
when: not kms_installed_from_source
- name: Print
debug:
msg:
- 'Status of "kms_installed_from_source": {{ kms_installed_from_source}}'
./templates/test.j2:
{% if kms_installed_from_source %}
kms_installed_from_source is defined
{% else %}
kms_installed_from_source is not defined
{% endif %}
Works
Neil Young schrieb am Mittwoch, 5. Januar 2022 um 19:43:17 UTC+1:
> Well it is easier as I thought. Should have tried by myself before having
> asked here. Sharing the result. Still need to derive the var from the file
> stat, but hoping it is possible:
>
> test.yml:
>
> # ansible-playbook -l offline -i hosts.cfg test.yml
>
> - hosts: all
>
> vars:
> test: true
>
> tasks:
>
> - name: Copy config file, when test is defined
> tags: copy
> template:
> src: templates/test.j2
> dest: test.cfg
> when: test
>
> - name: Copy config file, when test is not defined
> tags: copy
> template:
> src: templates/test.j2
> dest: test.cfg
> when: not test
>
>
> templates/test.j2:
>
> {% if test %}
> Test is defined
> {% else %}
> Test is not defined
> {% endif %}
>
>
> A run with test=true skips the second copy task (as desired) and produces
> a file, which states "Test is defined" (as desired). The other way around
> with test=false
>
>
>
>
> decades software schrieb am Mittwoch, 5. Januar 2022 um 19:22:43 UTC+1:
>
>> Exactly. Thanks
>>
>>
>> Am 05.01.2022 um 19:21 schrieb Wei-Yen Tan <[email protected]>:
>>
>> Can't see why you can't just run it before the template task. But your
>> choice really.
>>
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> ------------------------------
>> *From:* [email protected] <[email protected]> on
>> behalf of decades software <[email protected]>
>> *Sent:* Thursday, January 6, 2022 7:14:58 AM
>> *To:* [email protected] <[email protected]>
>> *Subject:* Re: [ansible-project] Variable state depending on existence
>> of a file on host system - possible?
>>
>> It is a grown project, I can't change everything just because of this.
>>
>> Anyway, if it is not possible, then ok. I can live with the glitch
>>
>>
>> Am 05.01.2022 um 19:13 schrieb Wei-Yen Tan <[email protected]>:
>>
>> Why put in a jinja file? Run the assertion first in the role task /fail
>> exit etc. Then run the template task
>>
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> ------------------------------
>> *From:* [email protected] <[email protected]> on
>> behalf of decades software <[email protected]>
>> *Sent:* Thursday, January 6, 2022 7:11:11 AM
>> *To:* [email protected] <[email protected]>
>> *Subject:* Re: [ansible-project] Variable state depending on existence
>> of a file on host system - possible?
>>
>> Looks pretty verbose. I have some doubts to be able to use this in a .j2
>> file.
>>
>> Am 05.01.2022 um 19:08 schrieb Wei-Yen Tan <[email protected]>:
>>
>> It is the example. Register
>>
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> ------------------------------
>> *From:* [email protected] <[email protected]> on
>> behalf of decades software <[email protected]>
>> *Sent:* Thursday, January 6, 2022 7:06:59 AM
>> *To:* [email protected] <[email protected]>
>> *Subject:* Re: [ansible-project] Variable state depending on existence
>> of a file on host system - possible?
>>
>> Well, yes. I know, how to stat a file. I don't know how to create a
>> variable from that with the same scope as a variable defined in
>> default.yml.
>>
>> I thought I was precise enough. Never mind. Disregard my question. Will
>> find it out.
>>
>>
>> Am 05.01.2022 um 18:34 schrieb Wei-Yen Tan <[email protected]>:
>>
>> Use stat module to get your required facts. Bring it into assert or fail
>>
>>
>> https://docs.ansible.com/ansible/latest/collections/ansible/builtin/stat_module.html
>>
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> ------------------------------
>> *From:* 'Neil Young' via Ansible Project <[email protected]>
>> *Sent:* Thursday, January 6, 2022 6:26:54 AM
>> *To:* [email protected] <[email protected]>
>> *Subject:* Re: [ansible-project] Variable state depending on existence
>> of a file on host system - possible?
>>
>> It is not the problem of existence. The var exists all the time. It is
>> about the wrong state
>>
>> Von meinem iPad gesendet
>>
>> Am 05.01.2022 um 18:18 schrieb Wei-Yen Tan <[email protected]>:
>>
>>
>> You could use the assert task to check that the variable exist before
>> starting the run
>>
>> Get Outlook for iOS <https://aka.ms/o0ukef>
>> ------------------------------
>> *From:* 'Neil Young' via Ansible Project <[email protected]>
>> *Sent:* Thursday, January 6, 2022 6:16:28 AM
>> *To:* Ansible Project <[email protected]>
>> *Subject:* [ansible-project] Variable state depending on existence of a
>> file on host system - possible?
>>
>> I'm currently having a var in my ./vars/default.yml, which is used at
>> several points in my playbook for branching installation operations.
>>
>> boolean_var: true
>>
>> Depending on this I'm performing (or not) install steps
>>
>> ....
>> when: not boolean_var
>>
>> So far so good. I'm also using this var in some j2 templates like so:
>>
>> {% if boolean_var %}
>> ...
>> {% endif %}
>>
>> My problem is, that I mostly forget to set this variable to a proper
>> state, which reflects the real status on the host system, so I have to
>> abort an update.
>> I would rather like to derive it from a pre_task, checking the existence
>> of a particular file on the host before starting all operations.
>>
>> Is there a way to define a variable with the same scope (playbook and
>> templates) at runtime?
>>
>>
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