Multi-level hierarchical configuration

[edeandrea]

It would be nice to be able to have multi-level hierarchical configuration.

TL;DR

If I have something like this in application.properties:

%knative.quarkus.config.profile.parent=prod
%knative.quarkus.kubernetes.deployment-target=knative

%knative-17.quarkus.config.profile.parent=knative
%knative-17.quarkus.docker.dockerfile-jvm-path=src/main/docker/Dockerfile.jvm17

%knative-openshift.quarkus.config.profile.parent=knative
%knative-openshift.quarkus.container-image.builder=openshift

%knative-openshift-17.quarkus.config.profile.parent=knative-openshift
%knative-openshift-17.quarkus.openshift.jvm-dockerfile=src/main/docker/Dockerfile.jvm17
%knative-openshift-17.quarkus.openshift.base-jvm-image=registry.access.redhat.com/ubi8/openjdk-17:1.11

This essentially sets up a profile hierarchy

                     prod
                        |
                  knative
                 /          \
      knative-17      knative-openshift
                                    |
                      knative-openshift-17

When I do something like ./mvnw package -Dquarkus.profile=knative-openshift-17 I would have expected the quarkus.kubernetes.deployment-target=knative to be "inherited" by the knative-openshift-17 profile, but it isn't.

Instead, I have to do this, where I end up duplicating a lot of properties:

# KNative
%knative.quarkus.config.profile.parent=prod
%knative.quarkus.kubernetes.deployment-target=knative

%knative-17.quarkus.config.profile.parent=prod
%knative-17.quarkus.kubernetes.deployment-target=knative
%knative-17.quarkus.docker.dockerfile-jvm-path=src/main/docker/Dockerfile.jvm17

# KNative on OpenShift
%knative-openshift.quarkus.config.profile.parent=prod
%knative-openshift.quarkus.container-image.builder=openshift
%knative-openshift.quarkus.kubernetes.deployment-target=knative

%knative-openshift-17.quarkus.config.profile.parent=prod
%knative-openshift-17.quarkus.container-image.builder=openshift
%knative-openshift-17.quarkus.kubernetes.deployment-target=knative
%knative-openshift-17.quarkus.docker.dockerfile-jvm-path=src/main/docker/Dockerfile.jvm17
%knative-openshift-17.quarkus.openshift.jvm-dockerfile=src/main/docker/Dockerfile.jvm17
%knative-openshift-17.quarkus.openshift.base-jvm-image=registry.access.redhat.com/ubi8/openjdk-17:1.11

Full details

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