References of type `env` not working as expected

[bdnf]

Describe the bug/feature

1. Secrets of type env are not visible after jsonnet files are compiled.
2. When default value for env ref type is not set but the $KAPITAN_VAR_some_variable is set, then kapitan compile fails with:

   Could not find ref backend for tag: ?{env:some_variable}
   Compile error: failed to compile target: microservice

To Reproduce Steps to reproduce the behavior:

1. Assuming simple folder structure:

   ├── components
   |   └── test-component.jsonnet
   └── inventory
   └── classes
   |       └── base.yml
   └── targets
           └── microserviceyml

2. Contents of components/test-component.jsonnet:

   
   local kap = import 'lib/kapitan.libjsonnet';
   local inventory = kap.inventory();

local TOPIC = inventory.parameters.arguments.topic; local database = std.asciiLower(inventory.parameters.arguments.mysql);

{ 'job': { apiVersion: 'batch/v1', kind: 'Job', metadata: { labels: { database: database, topic: std.asciiLower(TOPIC), deployment_name: inventory.parameters.deployment_name, }, name: database + '-' + std.asciiLower(TOPIC), }, spec: {} } }

3. Contents of *inventory/classes/base.yaml*:
```yaml
parameters:
  arguments:
    mysql: ?{env:database}
    topic: ?{env:topic}

  kapitan:
    compile:
      - output_path: ./${arguments:topic}/
        input_type: jsonnet
        output_type: json
        prune: True
        input_paths:
          - components/test-component.jsonnet

4. Contents of inventory/targets/microservice.yaml:

   
   classes:
   - base

parameters: deployment_name: dev target_namespace: default

commit_tag: 1223456789

kapitan: vars: target: microservice

5. Set the reference of type **env*:
```bash
export KAPITAN_VAR_database="sql.server:port/test_db"
export KAPITAN_VAR_topic="starting_offsets.TIER1"
# set defaults
echo -n "some-db-name" | kapitan refs  --write env:database -t  microservice -f -
echo -n "some-topic-name" | kapitan refs  --write env:topic -t  microservice -f -

6. Output is:

   kapitan compile -t microservice 
   Compiled microservice (0.04s)

And generated file is:

{
  "apiVersion": "batch/v1",
  "kind": "Job",
  "metadata": {
    "labels": {
      "database": "?{env:database:e1220f11}",
      "deployment_name": "dev",
      "topic": "?{env:topic:19fc3d6e}"
    },
    "name": "?{env:database:e1220f11}-?{env:topic:19fc3d6e}"
  }
}

Expected behavior Compiled successfully and compiled file to be compiled/microservice/job.json with contents:

{
  "apiVersion": "batch/v1",
  "kind": "Job",
  "metadata": {
    "labels": {
      "database": "sql.server:port/test_db",
      "deployment_name": "dev",
      "topic": "starting_offsets.TIER1"
    },
    "name": "sql.server:port/test_db-starting_offsets.TIER1"
  }
}

Possible Bug

• kapitan --version: 0.29.5
• python --version: Python 3.7.11
• pip3 --version: pip 21.2.2 from /opt/venv/lib/python3.7/site-packages/pip (python 3.7)
• pyenv

[Zeratyl06]

Try kapitan compile --reveal

[github-actions[bot]]

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