I'm having the following secret definition:
apiVersion: v1
kind: Secret
metadata:
name: "{{ .Release.Name }}-psql"
type: Opaque
stringData:
{{ if not .Release.IsUpgrade }}
dbReplPassword: {{ (randAlphaNum 23) | quote }}
{{ else }}
dbReplPassword: {{ index (lookup "v1" "Secret" .Release.Namespace "{{ .Release.Name }}-psql").data "dbReplPassword" | b64dec | quote }}
{{ end }}On initial installation of my helm chart, everything works smoothly. But when I upgrade my helm chart, it shows me the following error:
pgsql.yaml:11:21: executing "helm-chart/templates/pgsql.yaml" at <index (lookup "v1" "Secret" .Release.Namespace "{{ .Release.Name }}-psql").data "dbReplPassword">: error calling index: index of untyped nil
I guess the problem is the "{{ .Release.Name }}-psql" part of the lookup function, but I've no idea how I can fix this issue. Is anyone having any idea how I can fix it?
You can't nest Helm templates like this. The standard Go text/template language includes a printf function that you can use to construct a string from parameters, so use this instead:
... (lookup "v1" "Secret" .Release.Namespace (printf "%s-psql" .Release.Name)) ...It could be clearer to break up this complex expression into multiple variables:
{{- $secretName := printf "%s-psql" .Release.Name }}
{{- $secret := lookup "v1" "Secret" .Release.Namespace $secretName }}
dbReplPassword: {{ $secret.data.dbReplPassword | b64dec | quote }}