Ingress Hostname Regexp Matching

[bechampion]

What would you like to be added: I've added a new argument that does a regexp match on the source/ingress.go list of ingress hosts appended to the main list. This allow you to run regexp on the ingresses host that users add to their ingresses

Why is this needed:

Unless you split your dns configuration (on gcp for example) in multiple zones , there's is currently no way to limit the hosts that users configure on their ingresses , overwriting being the most common scenario . domain-filtering is only applying to the domain configuration lookup (but in some cases there's only one domain)

fqdn-templates is a good option , but unfortunately an Ingress object is passed to the Execute function on the template , instead of hosts , that means that you would potentially need to range inside the template to verify the hosts are matching what you want , it would be crazy.

My solution is a simple regexp match against the hosts listed on the ingress , this is a super basic example but if you are up for it , ill write tests and maybe split the code in some methods

This is fully working in this branch: https://github.com/bechampion/external-dns/tree/IngressHostRegex

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[aslafy-z]

/remove-lifecycle stale

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/lifecycle rotten

[aslafy-z]

/remove-lifecycle rotten

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/lifecycle stale

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/lifecycle rotten

[aslafy-z]

/remove-lifecycle rotten

[k8s-triage-robot]

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/lifecycle stale

[aslafy-z]

/remove-lifecycle stale

[k8s-triage-robot]

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/lifecycle stale

[aslafy-z]

/remove-lifecycle stale

[k8s-triage-robot]

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/lifecycle stale

[aslafy-z]

/remove-lifecycle stale

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/lifecycle stale

[aslafy-z]

/remove-lifecycle stale This is still something desired.

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/lifecycle stale

[aslafy-z]

This feature is still desired

[aslafy-z]

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

[k8s-triage-robot]

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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