The root of the problem is a bit complicated, and rooted in the fact that
historically jinja2 could only return strings. So we have code that
attempts to safely convert string representations of python datastructures
into actual python data structures.
What appears to be your problem is a bunch of added whitespace caused by
the jinja2 templating. The following seems to resolve the problem:
users: >-
{%- set cusers = ['user1', 'user2'] -%}
{%- if ansible_distribution == "RedHat" -%}
{{ cusers.append('redhat_user') }}
{%- else -%}
{{ cusers.append('other_user') }}
{%- endif -%}
{{ cusers | list }}
Notice the use of {%- and -%} which informs jinja2 to strip whitespace.
See http://jinja.pocoo.org/docs/dev/templates/
> You can also strip whitespace in templates by hand. If you add a minus
sign (-) to the start or end of a block (e.g. a For tag), a comment, or a
variable expression, the whitespaces before or after that block will be
removed
On Wed, May 8, 2019 at 3:43 PM Adam E <[email protected]> wrote:
> thanks for the reply, I had also thought of that solution and it's
> perfectly viable for my example (thanks). however was looking for
> something that doesn't use multiple variables and avoids repetition. My
> example was just a simple one, in some cases I have more complex jinja
> statements and the crux of what I was after was how to nicely do complex
> multiline jinja statements that use lists.
>
> On Wednesday, May 8, 2019 at 1:11:43 PM UTC-7, Kai Stian Olstad wrote:
>>
>> On 03.05.2019 22:15, Adam E wrote:
>> > Hi there, I have some logic that I want to apply when creating
>> assigning a
>> > list to a variable.
>> >
>> > See my sample playbook below, Ideally i'd like a nice clean way to have
>> a
>> > logic based list. the "users" approach works, however it's always
>> > interpreted as a string. The only solution I can think of to fix this
>> one
>> > is to store it as a string and then split it later. But I would like
>> to
>> > know if it's possible to return a list somehow. Maybe there's a
>> different
>> > syntax that i'm not aware of. Can anyone offer a better way to do
>> > something like below?
>> >
>> > - hosts: localhost
>> > connection: local
>> > vars:
>> > # THIS does not work as it's interpreted as a string, would have
>> to
>> > split in a new var?
>> > # is there anything I can do here to keep a similar syntax but
>> return a
>> > list?
>> > users: >-
>> > {% set cusers = ['user1', 'user2'] %}
>> > {% if ansible_distribution == "RedHat" %}
>> > {{ cusers.append('redhat_user') }}
>> > {% else %}
>> > {{ cusers.append('other_user') }}
>> > {% endif %}
>> > {{ cusers | list }}
>> > # THIS works but a little ugly with the newline
>> > users2: "{% set cusers = ['user1', 'users2'] %}\
>> > {% if ansible_distribution == 'RedHat' %}\
>> > {{ cusers.append('redhat_user') }}\
>> > {% else %}\
>> > {{ cusers.append('other_user') }}\
>> > {% endif %}\
>> > {{ cusers }}"
>>
>> Something like this should work
>>
>> vars:
>> cuser: ['user1', 'user2']
>> users: "{{ cuser + ['redhat_user'] if ansible_distribution ==
>> 'RedHat' else cuser + ['other_user'] }}"
>>
>> --
>> Kai Stian Olstad
>>
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Matt Martz
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sivel.net
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