I have labels as multiline string in _helpers.tpl
as below. How can i convert this into comma separated list.
_helpers.tpl:-
{{- define "mongo.selectorLabels" -}}
app: {{ include "mongo.name" . }}
release: {{ .Release.Name }}
{{- end }}
Expecting:
teplates/yaml:-
env:
- name: MONGO_SIDECAR_POD_LABELS
value: "{{- include "mongo.sidecar.pod.labels" . }}"
value: "app=mongo,release=dev"
Pseudo code i am trying.
_helpers.tpl:-
{{- define "mongo.sidecar.pod.labels" -}}
{{- $list := list -}}
{{- range $k, $v := ( include "mongo.selectorLabels" ) -}}
{{- $list = append $list (printf "%s=\"%s\"" $k $v) -}}
{{- end -}}
{{ join ", " $list }}
{{- end -}}
CodePudding user response:
The Helm include
extension function always returns a string; so you can't use range
to iterate over it as you've shown. However, Helm also includes an undocumented fromYaml
extension function that can convert a YAML-format string back to object form. So if you include
the helper template, then invoke fromYaml
to parse the string result, you can range
over the result:
{{- range $k, $v := include "mongo.selectorLabels" | fromYaml -}}
CodePudding user response:
I am able convert the values into =
separated key-value pairs. How can we join these with ,
and merge as single line.
{{- define "mongo.sidecar.pod.labels" -}}
{{ $lines := splitList "\n" ( include "mongo.selectorLabels" .| nindent 1) -}}
{{- range $lines }}
{{- if not (. | trim | empty) -}}
{{- $kv := . | splitn ":" 2 -}}
{{ printf "%s=%s" $kv._0 ($kv._1 | trim) }}
{{ end -}}
{{- end -}}
{{- end -}}
Output with the above code:-
env:
- name: MONGO_SIDECAR_POD_LABELS
value: " app=mongo
release=v1
"