"--crd-source-kind" flag doesn't work as intended

[acnodal-tc]

I'd like to use a CRD as a source, but the --crd-source-kind flag doesn't seem to do anything.

For example, I modified crd-manifest.yaml to change the name of the sample custom resource from "DNSEndpoint" to "XDNSEndpoint" and created a resource using that CRD. Then I ran:

$ build/external-dns --kubeconfig="$KUBECONFIG" --provider inmemory --source crd --crd-source-kind="XDNSEndpoint"

What happened:

INFO[0000] Using kubeConfig                             
INFO[0000] Created Kubernetes client https://192.168.254.10:16443 
DEBU[0000] groupVersion externaldns.k8s.io/v1alpha1     
ERRO[0005] no kind "XDNSEndpointList" is registered for version "externaldns.k8s.io/v1alpha1" in scheme "pkg/runtime/scheme.go:100"

What you expected to happen: external-dns lists XDNSEndpoint resources and uses them as DNSEndpoint sources.

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?: Slack discussion thread: https://kubernetes.slack.com/archives/C771MKDKQ/p1631820191048300

Environment:

• External-DNS version (use external-dns --version): external-dns-helm-chart-1.2.0-33-g8cc95229-dirty
• DNS provider:
• Others:

[ghost]

Working on a dynamic go-client crd source, seems to work but I need to figure out what tests to write: https://github.com/acnodal/external-dns/blob/dynamic-crd/source/crd.go

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