Cute

A small cue-lang utility.

Features

HTTP server for cue files

https://cuelang.org/docs/concepts/packages/#instances

All cue files with the same package can be evaluated within the context of a certain directory. Within this context, only the files belonging to that package in that directory and its ancestor directories within the module are combined. This is called an instance of a package.

The module root is marked by the presence of a cue.mod directory, initialized by cue mod init <mymodule>.

Running the cute command at a cue module root starts an HTTP server. The server evaluates an instance of cue corresponding to the request path and returns the object in YAML, ready to be piped into kubectl. The cue module root can also be specified in the CUE_DIR environment variable.

cd sample
cute

Example:

$ cd sample
$ tree .
.
├── config.cue
├── cue.mod
│   ├── module.cue
│   ├── pkg
│   └── usr
├── myapp
│   └── config.cue
└── namespace.cue

$ cue export ./myapp/ -e  'secret["my-app-config"]' --out yaml
apiVersion: v1
kind: Secret
data:
  foo: SGVsbG8gV29ybGQh
metadata:
  name: my-app-config
  namespace: default
  
$ cute &

$ curl http://localhost:8080/myapp
secret:
  my-app-config:
    apiVersion: v1
    kind: Secret
    data:
      foo: SGVsbG8gV29ybGQh
    metadata:
      name: my-app-config
      namespace: default

$ curl http://localhost:8080/myapp/secret/my-app-config
apiVersion: v1
kind: Secret
data:
  foo: SGVsbG8gV29ybGQh
metadata:
  name: my-app-config
  namespace: default

Use query parameters to inject tagged values (-t flags).

$ curl "http://localhost:8080/myapp/secret/my-app-config?namespace=prod"
apiVersion: v1
kind: Secret
data:
  foo: SGVsbG8gV29ybGQh
metadata:
  name: my-app-config
  namespace: prod

Base64 decode Kubernetes Secret data

$ cd sample/myapp
$ cue eval -e 'secret["my-app-config"]' | cute
{
        apiVersion: "v1"
        kind:       "Secret"
        metadata: {
                name:      "my-app-config"
                namespace: "default"
        }
        _data: {
                foo: 'Hello World!'
        }
}

Path and cue package can be specified with -l and -p flags.

$ cue eval -e 'secret["my-app-config"]' | cute -l secret -l "my-app-config" -p "mycluster"
package mycluster

secret: "my-app-config": {
        apiVersion: "v1"
        kind:       "Secret"
        metadata: {
                name:      "my-app-config"
                namespace: "default"
        }
        _data: {
                foo: 'Hello World!'
        }
}