validation misses nested values

[AFriemann]

missing values like {{ foo.bar }} will be missed during validation if foo is defined.

leaving it undefined only recognizes the top level variable as missing

01_configmaps.yaml.j2: ✗
- undefined variable: aws

[AFriemann]

possible solution via jinja2schema

https://stackoverflow.com/questions/42589514/how-to-get-nested-undeclared-variables-in-python-jinja2

Stack Overflow

how to get nested undeclared variables in python jinja2

I have an xml template and I'm loadind data into it using jinja2 template engine. I'm trying to validate that all the variables in the template are supplied:

from jinja2 import Environment,

[AFriemann]

the merged PR now raises a proper error when nested values are missing but validation still can't detect them properly.

[sl4vr]

@AFriemann, the easiest way to check for existence of nested variables is dry-run of rendering. But here we need to choose:

1. Fail on first undefined nested variable during render, means that if we find undefined, we will interrupt validation.
2. Fail on first undefined nested variable in every template, means that we still can validate other templates.
3. Evaluate expression that should raise undefined error to empty string, log error into standard output and proceed.

I've already made a Proof of Concept for third option: https://github.com/ClarkSource/k8t/pull/69