Using varsFrom

[artem-nefedov]

Is it possible to use varsFrom to pass non-string variables (object, list, bool, etc.)? And if yes, how you should format the values in a Secret/ConfigMap?

[chanwit]

It accepts value in JSON format (that's why a string is also valid). You can use JSON to encode any values you want.

https://github.com/weaveworks/tf-controller/blob/fd0dcd3cc716962ea281b617aac7b0fe083ee607/runner/server.go#L332-L337

and they all are written down into generated.auto.tfvars.json file:

https://github.com/weaveworks/tf-controller/blob/fd0dcd3cc716962ea281b617aac7b0fe083ee607/runner/server.go#L404-L405

[artem-nefedov]

Sorry, some things are still not clear to me, hope you can elaborate.

1. If ConfigMap has foo: "123" in data, will it be passed as a string, or as a number? And is there any way to force the type?
2. If ConfigMap has bar: '{"aaa": "bbb"}' in data, will that be passed as a literal string, or as an object? Once again, can I force the type?

[chanwit]

1. A number. You would try `foo: ""123"".
2. Yes, it becomes an object.

JSON supports three types, string, number, and boolean. To force the type of a value to a string, you would try escaping double quotes for it.

[BuckinghamIO]

I've tested this multiple times and passing something like

bar: '{"aaa": "bbb"}'

Still results in tf-controller treaing it as a string and then resulting in it complaining that the value isn't a object that terraform expects.