Allow and skip empty loop

[Adrian Sevcenco]

Hi! I would like to have an task that would delete groups
ONLY if the variable have a content ...

so i have an delete_users_groups.yml:
---
delete_groups:

delete_users:

####
and an users_task.yml with

- name: Delete groups on nodes
ansible.builtin.group:
name: "{{ group_del_name }}"
state: absent
loop_control:
loop_var: group_del_name
loop: "{{ delete_groups }}"

and a playbook with:

---
- hosts: "{{ target | default('all') }}"
gather_facts: False
vars_files:
- "{{ playbook_dir }}/../additions/users/user_group_info.yml"
- "{{ playbook_dir }}/../additions/users/delete_users_groups.yml"

tasks:
- include_tasks: tasks/users_task.yml


The error that i receive is:
Invalid data passed to 'loop', it requires a list, got this instead: None. Hint: If you passed a list/dict of just one element, try adding wantlist=True to your lookup invocation or use q/query instead of lookup.

i tried to add wantlist = True and i got
template error while templating string: expected token 'end of print statement', got '='. String: {{ delete_groups, wantlist=True }}

Any idea how can the loop pe skiped if the target of the loop is empty?

Thanks a lot!
Adrian

[Chiku]

Writing delete_groups: like that it mean empty string type.

So you need to write like delete_groups: [] as empty list type.

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[Vladimir Botka]

On Wed, 3 Apr 2024 12:11:34 +0300
Adrian Sevcenco <adria...@gmail.com> wrote:

> delete_groups:
>
> loop: "{{ delete_groups }}"

>
> The error that i receive is:
> Invalid data passed to 'loop', it requires a list, got this instead: None.

Use the filter *default*

loop: "{{ delete_groups | default([], true) }}"

See:
https://jinja.palletsprojects.com/en/3.1.x/templates/#jinja-filters.default

Optionally, use the module *ansible.utils.validate*
See:
https://docs.ansible.com/ansible/latest/collections/ansible/utils/validate_module.html


--
Vladimir Botka