CODEWITHSUNDEEP
variablesansibleescaping
NB art
NB art

Reputation: 75

Ansible Variable Within square brackets and single quotes [' ']

Hi Guys would anyone be able to advise how I can format a variable within square brackets and single quotes.

Im using inventory groups but wish to have a single var that I can change and be referenced ie

_devices:
   - webservers

and I would like the var _devices to be used within the following

`groups[' ']`

so I just have a single entry to change and not the whole play. Struggling to escape "{{ _devices }}" with [' ']

ie

groups['"{{_ devices }}"']

{% for host in groups['webservers'] %}
{{ hostvars[host][‘ansible_host’] }}
{% endfor %}

Upvotes: 0

Views: 3882

Answers (1)

mdaniel
mdaniel

Reputation: 33231

You are conflating a string literal with a variable reference; anytime one finds themselves trying to use nested jinja2 mustaches, it's a bug

Your talk of [] means you are expecting devices to in fact be a list of group names, in which case you'll want the | extract filter to apply [groups[g_name] for g_name in devices] (regrettably jinja2 does not understand list comprehensions like that). Then, because each extract run will itself be a list[str], meaning the output will be list[list[str]], but you want just list[str], you'll apply the |flatten to fold them up to one list

- debug:
    msg: >-
      all hosts in devices are: {{ devices | map("extract", groups) | flatten | list }}
  vars:
    devices:
    - webservers

Upvotes: 1

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