Extend support to fluxcd HelmRelease

[gberche-orange]

Thanks for contributing this great plugin ! It would be awesome to be able to leverage helm values completion while authoring helm release using the fluxcd HelmRelease custom resources

The associated feature request in jetbrains kubernetes plugin is tracked at https://youtrack.jetbrains.com/issue/IDEA-300867/Kubernetes-fluxcd-support-with-helm-chart-values-completion

[fstaudt]

Hello @gberche-orange ,

support for fluxcd HelmRelease CRD would make sense in the plugin.
There are however several features in the backlog that I want to treat in priority.
I'll keep this item in the backlog but I don't plan to work on it in the next 3 months.

While checking Flux CD documentation, I noticed that HelmRelease CRD doesn't contain all information required to retrieve the Helm chart: it only contains a reference to the HelmRepository CRD (assuming it is not a GitRepository or a Bucket).
It may be challenging to download the chart locally and extract the JSON schema from it (which is a pre-requisite to provide values completion).

[gberche-orange]

thanks @fstaudt for considering this idea !

it only contains a reference to the HelmRepository CRD (assuming it is not a GitRepository or a Bucket).
It may be challenging to download the chart locally and extract the JSON schema from it (which is a pre-requisite to provide values completion).

This makes me think of the current K8S api current completion in intellij which uses the active cluster to fetch the CRDs through K8S api
https://www.jetbrains.com/help/idea/2022.3/kubernetes.html#crd

I wonder whether the plugin could just try to download the helmchart tgz on the remo cluster using the K8S api.
Looking at https://devops.stackexchange.com/questions/4344/original-helm-chart-gone-how-can-i-find-get-it-from-the-cluster this might be possible by launching a new pod in the remote cluster and run helm fetch command from these, and kubectl cp back the tgz locally.

This would avoid requiring the plugin to deference the HelmRelease CR, extract the helm repository url and then fetching the helm chart tgz from these, supporting through an http proxy if the helm repository isn't directly reacheable from the current desktop.

[gberche-orange]

Another good first step might to leave it to the user to clone the helm chart repo, generate the json schema from it using the plugin (same as currently if I understood it well), and then just enjoy completion in the flux HelmRelease CRD