Helm default value throws error converting YAML to JSON - kubernetes

Question

I have a basic kubernetes helm template like below
apiVersion: v1
kind: ConfigMap
metadata:
name: test
namespace: {{ .Release.Namespace }}
labels:
app.kubernetes.io/version: {{ .Chart.AppVersion }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
app.kubernetes.io/instance: {{ .Release.Name }}
data:
config.tpl: |
{{- default ((tpl .Values.configTpl .) | indent 4) (tpl (.Files.Get "files/config.tpl") . | indent 4) -}}
and the values.yml file
configTpl: |
{{ x=8gwifi.org }}
When i apply the helm chart it throw me an error
❯ helm upgrade mychart . --namespace=test --create-namespace --debug
upgrade.go:142: [debug] preparing upgrade for mychart
Error: UPGRADE FAILED: YAML parse error on 8gwifi.org-test/templates/configmap-logfilegen.yaml: error converting YAML to JSON: yaml: line 11: did not find expected comment or line break
helm.go:84: [debug] error converting YAML to JSON: yaml: line 11: did not find expected comment or line break
I tried different configuration
config.tpl: |
{{- default (tpl .Values.configTpl . | indent 4) (tpl (.Files.Get "files/config.tpl") . | indent 4) -}}
still resulting in same error, Is there a way to specify a config value if none is passed then used the hardcoded one
I'm sure it's an YAML syntx issue couldn't figure it out checked all cases
Based on David suggestion
Template debug is showing this
data:
config.tpl: |-
x := 8gwifi.org
y := "functions"
I can cleary see y is not indent and throwing YAML syntax error, not sure how to fix this
This is the updated definition
data:
config.tpl: |-
{{ (tpl .Values.configTpl . | indent 4) | default (tpl (.Files.Get "files/config.tpl") . | indent 4) -}}
values.yml
configTpl: |
x := "8gwifi.org"
y := "function"

Answer 1

You're hitting problems with whitespace in the first line of the block scalar. You should check two things:
The template block containing indent must not itself be indented, it must start at the first column of its line; and
The template block containing indent must not have a - inside the opening curly braces.
{{- $configTpl := .Values.configTpl | default (.Files.Get "tiles/config.tpl") }}
config.tpl: |
{{ tpl $configTpl . | indent 4 }}
The templating language isn't really aware of YAML syntax as it runs. If you have spaces in front of the indent line, they will get emitted, and then indent adds its own leading space, resulting in the last output you get where the first line is indented extra. The - whitespace control marker will also consume the preceding newline, resulting in the first line of the output being on the same line as the YAML block scalar marker.