It took me a while to understand how to insert variables into a JINJA set statement. I read this tutorial which was helpful but still didn’t get me what I wanted. I wanted to be able to set a variable within a {% set %} parameter, something like this:

{% set variable = salt['vault'].read_secret('super/secret/path/{{ variable }}/more/secret/path/{{ another_variable}}', 'username') %}

Except that didn’t work. It simply rendered the brackets instead of inserting the variable.

I finally came across this stackoverflow page which outlined what I needed to do – a lot like in C, I needed to quote things I wanted to be taken literally, then add a + sign to insert the variable, then another + sign for the rest of the parameter. The correct syntax is as follows:

{% set variable = salt['vault'].read_secret('super/secret/path/' + variable + '/more/secret/path/' + another_variable', 'username') %}

This worked beautifully.