Get the name of the Helm subchart in the umbrella chart

Question

I have a subchart in the chart dependencies defined as:

dependencies:
  - condition: myTestSubchart.enabled
    name: my-test-subchart
    repository: oci://harbor.test.com/helm
    version: 0.1.0
    alias: myTestSubchart

The alias is defined as we cannot reference on the names with dashes in the yaml. However, using alias, we do not get the correct name of the subchart.

For example {{ template "my-test-subchart.name" .Subcharts.myTestSubchart }} will produce myTestSubchart instead of my-test-subchart, I understand this is because of the alias of the dependent subchart.

The template is default one:

{{/*
Expand the name of the chart.
*/}}
{{- define "my-test-subchart.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
{{- end }}

But I need to have an alias, because of the yaml convention.

One of the solution I do not like very much is to override the name back in the values.yaml of the umbrella chart like this:

myTestSubchart:
  nameOverride: my-test-subchart

This will produce expected my-test-subchart from {{ template "my-test-subchart.name" .Subcharts.myTestSubchart }}.

However, it is hardcoded in the values of the umbrella chart.

Is there any solution for that without overriding values?

Answer 1

I was looking for the same. The following works for me:

The alias is defined as we cannot reference on the names with dashes in the yaml.

One can use the sprig template functions for this, which are part of helm templates.

Remove the alias. Instead of:

{{ template "my-test-subchart.name" .Subcharts.myTestSubchart }}

use:

{{ include "my-test-subchart.name" (get .Subcharts "my-test-subchart") }}

This should give you the name from the chart definition.