Insert Environment Variable using Jinja in SaltStack - jinja2

Question

I am trying to read a JSON file inside a folder. using import_json.
Here is my code
{% set instance_id = grains['INSTANCE_ID'] %}
INSTANCE_ID Env Var:
environ.setenv:
- name: INSTANCE_ID
- value: {{ grains['INSTANCE_ID'] }}
- update_minion: True
{% import_json "/tmp/$INSTANCE_ID/conf.json" as config_properties %}
But I am getting this error
Data failed to compile:
Rendering SLS 'base:cloud.steps.conf' failed: Jinja error: /tmp/$INSTANCE_ID/conf.json.
Although when I insert the INSTANCE_ID manually it works as expected.
What I want is to be able to insert either $INSTANCE_ID or directly the grain value {{ grains['INSTANCE_ID'] }}
Can someone please help me with this?
Thanks.

Answer 1

{% import_json "/tmp/$INSTANCE_ID/conf.json" as config_properties %}
I imagine you are trying to evaluate the variable $INSTANCE_ID in the above statement. Jinja template evaluates the variables in expression statements.
In this case, the variable is set in the first line, using set
{% set instance_id = grains['INSTANCE_ID'] %}
So, you can use it in expression along with string appends, like
{% import_json "/tmp/" ~ instance_id ~ "/conf.json" as config_properties %}
The above statement should resolve your error.
Also, I would suggest using a variable to evaluate the value of the string expression above, like
{% set conf_json_path = "/tmp/" ~ instance_id ~ "/conf.json" %}
and use it like this
{% import_json conf_json_path as config_properties %}
Hope this help!
In case, you wish to use grains dictionary directly, you can use the value like so
{% set conf_json_path = "/tmp/" ~ grains['INSTANCE_ID'] ~ "/conf.json" %}