I'm trying to iterate over a list in a helm template, and add a suffix to each member. I currently have this block of code that does exactly that:
{{- range $host := .Values.ingress.hosts }}
{{- $subdomain := initial (initial (splitList "." $host)) | join "." }}
{{- $topLevelDomain := last (splitList "." $host) }}
{{- $secondLevelDomain := last (initial (splitList "." $host)) }}
- host: {{- printf " %s-%s.%s.%s" $subdomain $environment $secondLevelDomain $topLevelDomain | trimSuffix "-" }}
{{- end }}Since I need to do the exact same manipulation twice in the same file, I want to create a new list, called $host-with-env, that will contain the suffix I'm looking for. That way I can only perform this operation once.
Problem is - I've no idea how to create an empty list in helm - so I can't append items from the existing list into the new one.
Any idea how can I achieve this?
I'm also fine with altering the existing list but every manipulation I apply to the list seems to apply to the scope of the foreach I apply to it. Any ideas how to go about this?
It might not be quite clear what result are you trying to achieve, it will be helpful to add your input, like your values.yaml and the desired output. However, I added an example that answers your question.
Inspired by this answer, you can use dictionary.
This code will add suffix to all .Values.ingress.hosts and put them into $hostsWithEnv dictionary into a list, which can be accessed by myhosts key
values.yaml
ingress:
hosts:
- one
- twoconfigmap.yaml
{{- $hostsWithEnv := dict "myhosts" (list) -}}
{{- range $host := .Values.ingress.hosts -}}
{{- $var := printf "%s.domain.com" $host | append $hostsWithEnv.myhosts | set $hostsWithEnv "myhosts" -}}
{{- end }}
apiVersion: v1
kind: ConfigMap
metadata:
name: my-configmap
data:
{{- range $hostsWithEnv.myhosts}}
- host: {{- printf " %s" . | trimSuffix "-" }}
{{- end }}output
$ helm install --debug --dry-run .
[debug] Created tunnel using local port: '62742'
...
# Source: mychart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: my-configmap
data:
- host: one.domain.com
- host: two.domain.com