formating variables with dots and slash in name

[prune998]

Hi all,

I'm trying to use Dasel to select (filter) one annotation out of a kubectl get commands. The annotation is not always present in all the objects, so I thought I would solve the issue by using a --format option, but so far I failed.

Kubectl command is:

kubectl get ingress -A -o json

which returns a json with:

{
    "apiVersion": "v1",
    "items": [
        {
            "apiVersion": "networking.k8s.io/v1",
            "kind": "Ingress",
            "metadata": {
                "annotations": {
                    "example": "value",
                    "kubectl.kubernetes.io/last-applied-configuration": "{\"escaped\":\"jsonValues\"}"
...

I first tried to only use a select:

k get ing -A -o json | dasel -p json select -m  -s 'items.[*].metadata.annotations.kubectl\.kubernetes\.io/last-applied-configuration'

Error: could not query multiple node: could not find multiple value: no value found for selector: .kubectl.kubernetes.io/last-applied-configuration

Using --null only prints null.

Using format I tried different variations of:

k get ing -A -o json | dasel -p json select -m  -s 'items.[*].metadata.annotations' --format '{{ if .kubectl\.kubernetes\.io\/last-applied-configuration }}{{ select ".kubectl.kubernetes.io/last-applied-configuration" }}{{ else }}-{{ end}}'

But they all fail on the if because it contains . or \ or " ...
Any way of achieving this ?

Thanks

[TomWright]

You've got the right idea, but with the golang templating you need to use the index function to access map keys: https://pkg.go.dev/text/template#hdr-Functions

index
Returns the result of indexing its first argument by the
following arguments. Thus "index x 1 2 3" is, in Go syntax,
x[1][2][3]. Each indexed item must be a map, slice, or array.

For context, the format string is a plain golang text/template and is processed outside of the normal dasel selector syntax. You could probably use the select func in the condition to use dasel syntax but in the meantime here's what I came up with:

$ echo '{
    "apiVersion": "v1",
    "items": [
        {
            "apiVersion": "networking.k8s.io/v1",
            "kind": "Ingress",
            "metadata": {
                "annotations": {
                    "example": "value",
                    "kubectl.kubernetes.io/last-applied-configuration": "{\"escaped\":\"jsonValues\"}"
                }
            }
        },
        {
            "apiVersion": "networking.k8s.io/v1",
            "kind": "Ingress",
            "metadata": {
                "annotations": {
                    "example": "value"
                }
            }
        }
    ]
}' | dasel -p json -m -s 'items.[*].metadata.annotations' --format '{{ if index . "kubectl.kubernetes.io/last-applied-configuration" }}{{ toJson . }}{{ else }}-{{ end}}'
{"example":"value","kubectl.kubernetes.io/last-applied-configuration":"{\"escaped\":\"jsonValues\"}"}
-

https://dasel.tomwright.me/s/3b29e743-00f1-48f3-b3e6-884289502168

If you want pretty JSON there is a toPrettyJson func you could use instead.

I can see the value in checking the presence of keys so perhaps that will come in the future.