Add label app.kubernetes.io/part-of when enabling add-ons

[roar-skinderviken]

Summary

When running e.g.
microk8s enable ingress
13 resources will be added to the cluster. Trying to track down these resources is cumbersome, and would be a lot easier with label app.kubernetes.io/part-of, e.g.:

metadata:
  labels:
    app.kubernetes.io/part-of: ingress

Why is this important?

When using Flux and adding e.g. cloudnative-pg, some ingress resources need to be patched in order to expose Postgres. This is usually done with Kustomize. This is only possible (as far as I know) when having all YAML-files for e.g. ingress in the Flux infra-repo.

Can be solved like this in utils.sh, but this solution requires yq (I find jq below /snap/microk8s/current/user/bin/, but not yq).

    # extract the part-of label value
    local part_of_label=${manifest%%/*}

    # insert label app.kubernetes.io/part-of for all resources
    yq eval ".metadata.labels[\"app.kubernetes.io/part-of\"] = \"$part_of_label\"" -i "${tmp_manifest}"

before this line

    "$SNAP/kubectl" "--kubeconfig=$SNAP_DATA/credentials/client.config" "$action" -f "${tmp_manifest}"

I tried to solve this using sed , but I couldn't figure out how to handle existing metadata/labels.