Convert between "ImagesLock" and kbld's "Config" files

imglock.sh

#!/usr/bin/env bash

KIND=$(yq --raw-output '.kind' <(cat $1))

case ${KIND} in
  "Config")
read -r -d '' TEMPLATE <<'EOF'
#@ load("@ytt:data", "data")
---
apiVersion: imgpkg.k14s.io/v1alpha1
kind: ImagesLock
spec:
  images:
  #@ for/end override in data.values.overrides:
  - url: #@ override.newImage
    name: #@ override.image.split(":")[0]
    tag: #@ override.image.split(":")[1]
    metadata: ""

EOF
    ;;
  "ImagesLock")
read -r -d '' TEMPLATE <<'EOF'
#@ load("@ytt:data", "data")
---
apiVersion: kbld.k14s.io/v1alpha1
kind: Config
overrides:
#@ for/end img in data.values.spec.images:
- image: #@ "{}:{}".format(img.name, img.tag)
  newImage: #@ img.url
  preresolved: true
EOF
    ;;
  *)
    echo "File $1 is an unexpected kind, "${KIND}" (expected one of 'Config', 'ImageLock')."
esac

ytt -f values.yml=<(echo -e "#@data/values\n---\n"; cat $1) -f template.yml=<(echo "${TEMPLATE}")