Jsonnet Transformations

Kasane uses Jsonnet to transform objects in its pipeline. You can use jsonnet to define new objects, but more commonly you’d use it to make paches to vendored dependencies. This example shows how to modify a vendored dependency.

$ cat Kasanefile
layers:
- https://raw.githubusercontent.com/google/kasane/master/examples/02-jsonnet-transformations/object.yaml
- patch.jsonnet

$ kasane update

$ kasane show
kind: VendoredObject
config:
  defaultFlag: 42
  otherFlag: don't change
metadata:
  name: PreconfiguredObject

Jsonnet files receive the array with all the previous layers concatenated as a function input named layers and must return an array with the results. It might be a completely different set of objects but it still must be an array.