app-with-overlay.yml

#! If you want to customize any aspect of the configuration that is not explicitly exposed via app.make(...),
#! you can use [overlay feature](https://github.com/k14s/ytt/blob/master/docs/lang-ref-ytt-overlay.md).
#! For example, below we have `updates()` to force SSL redirection for this particular app.

#@ load("@ytt:template", "template")
#@ load("@ytt:overlay", "overlay")
#@ load("@ytt:library", "library")

#@ def config(port=80):
name: hello
port: #@ port
#@overlay/replace
container:
  image: hashicorp/http-echo
  args:
  - #@ "-listen=:" + str(port)
  - -text="hello!"
#@ end

#@ def updates():
#@overlay/match by=overlay.subset({"kind":"Ingress"})
---
metadata:
  #@overlay/match missing_ok=True
  annotations:
    #@overlay/match missing_ok=True
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
#@ end

#@ app = library.get("github.com/vmware-tanzu/carvel-ytt-library-for-kubernetes/app").with_data_values(config())

--- #@ template.replace(overlay.apply(app.eval(), updates()))