Array in YAML causes Kubernetes charm failed deployment

[Tom Barber]

I've been testing K8S charms and specifically, one image I use uses square bracket arrays in the pod spec environment variables:

    druid_extensions_loadList: '["postgresql-metadata-storage"]'

This causes the deployment to fail with:

    parsing unit spec for dc4: error unmarshaling JSON: json: cannot unmarshal array into Go struct field EnvVar.value of type string

But is valid Kubernetes deployment YAML. I don't want to fork the upstream containers for a reason that is Juju related.

More details can be found here: https://discourse.jujucharms.com/t/square-brackets-in-env-vars/2024

[Richard Harding (rharding)]

Thanks, this is an issue because the upstream container expects the [] values and so it can't be easily worked around without changing the upstream container.

[Ian Booth (wallyworld)]

It's not an upstream container issue, it's an issue with how Juju processes the pod spec YAML.
We'll do a Juju fix.