[RFC-0002] Implement Flux OCI support for Helm

[stefanprodan]

Implement Flux OCI support for Helm according to RFC-0002 specifications.

For e2e testing we can use: https://github.com/users/stefanprodan/packages/container/package/charts%2Fpodinfo

[pembunuhraja85]

Hello

[adim]

I have an issue pulling charts from GCP Artifact Registry.
I deployed the chart according to: https://cloud.google.com/artifact-registry/docs/helm/store-helm-charts

Name:         hello-chart
Namespace:    flux-system
Labels:       kustomize.toolkit.fluxcd.io/name=infrastructure
              kustomize.toolkit.fluxcd.io/namespace=flux-system
Annotations:  <none>
API Version:  source.toolkit.fluxcd.io/v1beta2
Kind:         HelmRepository
Metadata:
  Creation Timestamp:  2022-06-09T14:43:23Z
  Finalizers:
    finalizers.fluxcd.io
  Generation:  1
  Managed Fields:
    API Version:  source.toolkit.fluxcd.io/v1beta2
    Fields Type:  FieldsV1
    fieldsV1:
      f:metadata:
        f:labels:
          f:kustomize.toolkit.fluxcd.io/name:
          f:kustomize.toolkit.fluxcd.io/namespace:
      f:spec:
        f:interval:
        f:type:
        f:url:
    Manager:      kustomize-controller
    Operation:    Apply
    Time:         2022-06-09T14:43:23Z
    API Version:  source.toolkit.fluxcd.io/v1beta2
    Fields Type:  FieldsV1
    fieldsV1:
      f:metadata:
        f:finalizers:
          .:
          v:"finalizers.fluxcd.io":
    Manager:      source-controller
    Operation:    Update
    Time:         2022-06-09T14:43:23Z
    API Version:  source.toolkit.fluxcd.io/v1beta2
    Fields Type:  FieldsV1
    fieldsV1:
      f:status:
        f:conditions:
        f:observedGeneration:
    Manager:         source-controller
    Operation:       Update
    Subresource:     status
    Time:            2022-06-09T14:43:24Z
  Resource Version:  2140070
  UID:               16023207-4bff-494a-a2a5-157a3f014ccf
Spec:
  Interval:  5m
  Timeout:   60s
  URL:       oci://us-central1-docker.pkg.dev/adim-project/quickstart-helm-repo/hello-chart
Status:
  Conditions:
    Last Transition Time:  2022-06-09T14:43:43Z
    Message:               failed to construct Helm client: scheme "oci" not supported
    Observed Generation:   1
    Reason:                Failed
    Status:                True
    Type:                  Stalled
    Last Transition Time:  2022-06-09T14:43:43Z
    Message:               failed to construct Helm client: scheme "oci" not supported
    Observed Generation:   1
    Reason:                Failed
    Status:                False
    Type:                  Ready
    Last Transition Time:  2022-06-09T14:43:43Z
    Message:               failed to construct Helm client: scheme "oci" not supported
    Observed Generation:   1
    Reason:                Failed
    Status:                True
    Type:                  FetchFailed
  Observed Generation:     1
Events:
  Type     Reason     Age    From               Message
  ----     ------     ----   ----               -------
  Normal   Succeeded  4m46s  source-controller  Helm repository is ready
  Warning  Failed     4m27s  source-controller  failed to construct Helm client: scheme "oci" not supported

Flux version:

flux: v0.31.1
helm-controller: v0.21.0
kustomize-controller: v0.25.0
notification-controller: v0.23.5
source-controller: v0.24.4

Any idea?

[souleb]

Did you follow the guide here: https://fluxcd.io/docs/guides/helmreleases/#helm-oci-repository?

You need spec.type set for an OCI Helmrepository.