Testing the existence of helm element defined in values.yaml

Question

I am new in helm and currently come up with a situation where I need to test the existence of 2 parameters defined in values.yaml and if present, use the value of the same in sample.yaml.

Note - This is sure that one of them will be present.

For example:

I am testing for these 2 values:

1 - {{ .Values.probes.xyz.readiness.initialDelaySeconds }}
2 - {{ .Values.readiness.xyz.initialDelaySeconds }}

And inside sample.yaml, I have to implement one of the above parameter based on existence:

initialDelaySeconds: <one of the above values needs to be implemented based on the existence>

I understand it's a simple if else condition, but I am unable to implement. Any help would be appreciated.

Answer 1

For logic where you want to use some value if it's set and some other value if not, the Helm default function is usually a good match.

{{- $v1 := .Values.probes.xyz.readiness.initialDelaySeconds }}
{{- $v2 := .Values.readiness.xyz.initialDelaySeconds }}
initialDelaySeconds: {{ $v1 | default $v2 }}

If you have multiple settings like this, you can also do things like merge the two values-item dictionaries together.

{{- $readiness := merge dict .Values.probes.xyz.readiness .Values.readiness.xyz }}
initialDelaySeconds: {{ $readiness.initialDelaySeconds }}