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golang template - how are the semantics for default

9/27/2018

Looking at helm charts, there is often something like:

{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}

I could not find anything about the default function(?) in the template docs:

What is the semantics of it? Are there any kind of arguments possible?

-- ProfHase85

go

kubernetes-helm

9/27/2018

It comes from the library sprig, which is used by Helm. Quoting the docs:

default "foo" .Bar

In the above, if .Bar evaluates to a non-empty value, it will be used. But if it is empty, foo will be returned instead.

-- bereal

Source: StackOverflow