[bitnami/external-dns] unsupported protocol scheme "oci"

[oliveirajoaop]

Name and Version

bitnami/external-dns

What architecture are you using?

amd64

What steps will reproduce the bug?

1 - Successfully deployed bitnami/external-dns version 8.5.1 to eks version 1.30.6 with flux 2.4.0
2 - Update external dns from version 8.5.1 to 8.6.0, 8.6.1 or 8.7.0

Are you using any custom parameters or values?

No

What is the expected behavior?

The update should run with no errors.

What do you see instead?

Updating the helm-release to version 8.6.0, 8.6.1 or 8.7.0 will result in error with the message:
chart pull error: failed to download chart for remote reference: Get "oci://registry-1.docker.io/bitnamicharts/external-dns:8.6.0": unsupported protocol scheme "oci" and chart pull error.

Additional information

Helm Repo

apiVersion: source.toolkit.fluxcd.io/v1beta2
kind: HelmRepository
metadata:
  name: bitnami
  namespace: flux-system
spec:
  interval: 10m
  url: https://charts.bitnami.com/bitnami

Helm release

---
apiVersion: helm.toolkit.fluxcd.io/v2
kind: HelmRelease
metadata:
  name: external-dns
  namespace: external-dns
spec:
  releaseName: external-dns
  chart:
    spec:
      chart: external-dns
      sourceRef:
        kind: HelmRepository
        name: bitnami
        namespace: flux-system
      version: 8.6.0 (8.6.1 or 8.7.0)
  interval: 1m

[oliveirajoaop]

Managed to solve the issue the right way with the OCI Repo

[carrodher]

As reported in helm/helm#13466, this problem stems from how the helm ... --repo ... command handles an index.yaml file containing OCI URLs.

Why is this issue appearing now?

Historically, Bitnami Helm charts were accessed by adding the Bitnami repository to the Helm CLI:

$ helm repo add bitnami https://charts.bitnami.com/bitnami

or by directly installing/pulling a specific Helm chart using the --repo flag:

$ helm pull --repo https://charts.bitnami.com/bitnami foo

In April 2023, Bitnami introduced support for the OCI format, recommending OCI-based installation as the primary method going forward. For example:

helm pull oci://registry-1.docker.io/bitnamicharts/external-dns --version 8.6.0

As detailed in our recent announcement and #30110, the traditional method is now being deprecated. Consequently, the index.yaml served at https://charts.bitnami.com/bitnami now uses OCI URLs, exposing the above mentioned issue in the Helm CLI's handling of these URLs.