in helm: want to catch errors from getHostByName to define actions

[ns-kvaradhan]

I am following up form a request to the helm guys in helm/helm#9737
Here, I am using

rbi-env [ingress✗]➜ helm version
version.BuildInfo{Version:"v3.5.4", GitCommit:"1b5edb69df3d3a08df77c9902dc17af864ff05d1", GitTreeState:"dirty", GoVersion:"go1.16.3"}

I would like to use the following:

  {{- if getHostByName .Values.hostName }}
  annotations:
    kubernetes.io/ingress.global-static-ip-name: {{ .Values.hostName | quote }}
  {{- end }}

Which works when .Values.hostname is resolvable, but throws up an error, when it fails:

foo [ingress✗]➜ helm template bar --set hostName=asd.ldsjf.com
Error: template: bar/templates/ingress.yaml:1:9: executing "bar/templates/ingress.yaml" at <getHostByName .Values.hostName>: error calling getHostByName: invalid argument to Intn

Use --debug flag to render out invalid YAML

I see this comment in the sprig code:

sprig/network.go

Lines 9 to 10 in 3ac42c7

	addrs, _ := net.LookupHost(name)
	//TODO: add error handing when release v3 comes out

Any chance I can get a fix for me to try this out?

Thanks,

Kannan

[riccardo32]

We also have a use case that it should not stop/exit when/if Host is not resolvable.
Achieved by returning nil

addrs, err := net.LookupHost(name) if err != nil { return "", nil }

[ns-kvaradhan]

There is actually a Rhttps://github.com//issues/302 #279 that has the fixes for this issue.

[riccardo32]

Created PR for this - #319