kustomize-libsonnet

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kustomize-libsonnet

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A jsonnet library that implements most of the kustomize operations

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# Kubernetes kustomize operations in jsonnet

This repo contains [`kustomize.libsonnet`](https://github.com/anguslees/kustomize-libsonnet/blob/master/kustomize.libsonnet) - a jsonnet library that re-implements the core transformation operations of the Kubernetes [kustomize](https://kustomize.io/) tool.

There are two major differences from the real `kustomize` tool:
- The "overlay" file is described in jsonnet syntax, rather than `kustomize.yaml`.  Jsonnet is significantly more powerful, so you can trivially implement (and share) new transformations using this approach.
- The file I/O directives of `kustomize` are not implemented.  Jsonnet is a sand-boxed language, which is good for security, and a library cannot implement "new" ways to read files.  `kubecfg` already supports importing content from YAML/JSON files, and from remote URLs.

See [`example.jsonnet`](https://github.com/anguslees/kustomize-libsonnet/blob/master/example.jsonnet) for one way to apply these transformations to existing YAML manifest files.  The example uses the [`kubecfg`](https://github.com/ksonnet/kubecfg) tool (to parse the input YAML files), although `kustomize.libsonnet` itself should also work in other jsonnet environments.  It can also be combined with other jsonnet libraries, such as [kube.libsonnet](https://github.com/bitnami-labs/kube-libsonnet) and [k.libsonnet](https://github.com/ksonnet/ksonnet-lib).

Note that (just like regular `kustomize`) projects using `kustomize.libsonnet` can "stack": **Team A** can import some upstream JSON/YAML (or jsonnet!) manifests, and apply a `kustomize.libsonnet` "overlay" to modify it for their particular needs.  **Team B** can import the `kustomize.libsonnet` from team A and then apply _another_ `kustomize.libsonnet` overlay with _their_ additional needs, and so on.

kustomize-libsonnet

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