can't use range inside library chart defined template in helm

[mkopecny-cen88446]

Hello,

I have pretty much the same issue as described here: https://stackoverflow.com/questions/77352107/cant-use-range-inside-library-chart-defined-template-in-helm

I have created a simple library chart following the documentation here: https://helm.sh/docs/topics/library_charts/#create-a-simple-library-chart

_configmap.yaml:

{{- define "linux-shared.configmap.tpl" -}}
{{- range $i, $v := .Values.configMaps }}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ default ( list ( include "linux-shared.fullname" $ ) $i | join  "-" ) $v.name | trunc 63 | trimSuffix "-" }}
  labels:
    {{- include "linux-shared.labels" $ | nindent 4 }}
{{- if $v.data }}
data:
  {{- range $k, $v := $v.data }}
  {{ $k | quote }}: {{ $v | quote }}
  {{- end }}
{{- end }}
{{- if $v.binaryData }}
binaryData:
  {{- range $k, $v := $v.binaryData }}
  {{ $k | quote }}: {{ $v | quote }}
  {{- end }}
{{- end }}
{{- end }}
{{- end }}
{{- define "linux-shared.configmap" -}}
{{- include "linux-shared.util.merge" (append . "linux-shared.configmap.tpl") -}}
{{- end -}}

I want to create multiple ConfigMaps based on list variable in values.yaml:

configMaps:
   - name: "1"
     mountPath: /some/path
     data:
       foo: "bar"
       blb: "kkk"
     binaryData:
       file: "AgAJU7..."
   - name: "2"
     data:
       foo: "bar"
     binaryData:
       file: "AgAJU7..."

In a chart I include this library in configmap.yaml:

{{- include "linux-shared.configmap" (list . "linux-httpd.configmap") -}}
{{- define "linux-httpd.configmap" -}}
pepa: ahoj
{{- end -}}

I would expect 2 ConfigMap objects to be created but only the first one is. On other hand if I change configmap.yaml to:

{{- include "linux-shared.configmap.tpl" . -}}

then it works as expected. But I would also like to use the "merge" functionality mentioned in documentation. Would appreciate any help. Thank you.

helm version: version.BuildInfo{Version:"v3.15.0-rc.2", GitCommit:"c4e37b39dbb341cb3f716220df9f9d306d123a58", GitTreeState:"clean", GoVersion:"go1.22.3"}

_util.tpl:

{{- /*
linux-shared.util.merge will merge two YAML templates and output the result.
This takes an array of three values:
- the top context
- the template name of the overrides (destination)
- the template name of the base (source)
*/}}
{{- define "linux-shared.util.merge" -}}
{{- $top := first . -}}
{{- $overrides := fromYaml (include (index . 1) $top) | default (dict ) -}}
{{- $tpl := fromYaml (include (index . 2) $top) | default (dict ) -}}
{{- toYaml (merge $overrides $tpl) -}}
{{- end -}}

[kfox1111]

the macro is assuming '.' has Values at the range, but then your passing a list: (list $ "linux-httpd.configmap") which has no .Values, so range is probably skipping over it?

[mkopecny-cen88446]

the macro is assuming '.' has Values at the range, but then your passing a list: (list $ "linux-httpd.configmap") which has no .Values, so range is probably skipping over it?

No idea to be honest. I just followed documentation. The first item from range is rendered properly thought.

[Yagya-omnius]

in values.yaml, you can define as

configmapvalues:
  DATABASE_HOST: postgres-omnius
  DATABASE_PORT: 5432

in configmap.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Chart.Name }}-config
data:
  {{- range $key, $val := .Values.configmapvalues }}
  {{ $key }}: {{ $val | quote }}
  {{- end }}