Ansible Jinja2 string comparison

Question

I am getting value of variable "env" in Jinja2 template file using a variable defined in group_vars like:

env: "{{ defined_variable.split('-')[0] }}"

env possible three values could be abc, def, xyz.

On the basis of this value I want to use server URL, whose possible values I have defined inside defaults/main.yml as:

server_abc: https://xxxx.xxx.com
server_def: https://xxxxx.xxx.com
server_xyz: https://xxxx.xxx.com

In Jinja2 template, I am trying to do:

{% if 'abc'  == "{{env}}" %}
serverURL: '{{ server_abc }}'
{% elif 'def'  == "{{env}}" %}
serverURL: '{{ server_def}}'
{% elif 'xyz' == "{{env}}" %}
 serverURL: '{{ server_xyz }}'
{% else %}
ServerURL: 'server Url not found'
{% endif %}

However it is always ending up defining ServerURL = "server URL not found" even if env comes with value of abc, def or xyz.

If I try to replace env in Jinja2 template (hardcoded) like below condition does satisfy to true:

     {% if 'abc'  == "abc" %}
     serverURL: '{{ server_abc }}' 

So that implies me syntax is true but the value of "{{env}}" at run time is not evaluated.

Any suggestion what can I do to solve this?

Answer 1

You don't need quotes and braces to refer to variables inside expressions. The correct syntax is:

{% if 'abc' == env %}
serverURL: '{{ server_abc }}'
{% elif 'def' == env %}
serverURL: '{{ server_def }}'
{% elif 'xyz' == env %}
serverURL: '{{ server_xyz }}'
{% else %}
ServerURL: 'server URL not found'
{% endif %}

Otherwise you compare two strings, for example abc and {{env}} and you always get a negative result.