register-referentie/infra/helm/big-reference/templates/_helpers.tpl

{{/*
One pod spec for every workload, Deployment and Job alike. The chart is
values-driven on purpose: `.Values.workloads` is a near-literal transcription of
infra/docker-compose.yml, so the two stacks can be diffed by eye instead of by
archaeology. Adding a service is a values edit, not a template edit.

Called as: include "big.podspec" (dict "root" $ "name" $name "w" $w)
*/}}
{{- define "big.podspec" -}}
{{- $root := .root -}}
{{- $name := .name -}}
{{- $w := .w -}}
{{- with $root.Values.imagePullSecrets }}
imagePullSecrets:
{{- toYaml . | nindent 2 }}
{{- end }}
{{- with $w.waitFor }}
initContainers:
  - name: wait-for-deps
    image: {{ $root.Values.images.busybox }}
    command:
      - sh
      - -c
      - |
        for t in {{ join " " . }}; do
          echo "waiting for $t"
          until nc -z "${t%:*}" "${t#*:}"; do sleep 2; done
        done
{{- end }}
containers:
  - name: {{ $name }}
    image: {{ include "big.image" (dict "root" $root "name" $name "w" $w) }}
    # Only this repo's images get the configured policy: their `dev` tag is mutable.
    # Upstream tags are pinned, so IfNotPresent keeps them out of pod-template diffs —
    # which matters because a changed template makes a Job unpatchable (immutable).
    imagePullPolicy: {{ if $w.own }}{{ $root.Values.images.pullPolicy }}{{ else }}IfNotPresent{{ end }}
    {{- if $w.command }}
    {{- fail (printf "workload %s: use `args`, not `command` — compose's `command:` replaces CMD, but Kubernetes' `command:` replaces the image ENTRYPOINT (postgres would run as root, keycloak would exec `start-dev`)" $name) }}
    {{- end }}
    {{- with $w.args }}
    args:
{{- toYaml . | nindent 6 }}
    {{- end }}
    {{- with $w.envFrom }}
    envFrom:
    {{- range . }}
      - configMapRef:
          # optional: an env group whose feature is disabled (e.g. otel) simply
          # isn't rendered, and the pod must still start.
          name: {{ printf "%s-env" . }}
          optional: true
    {{- end }}
    {{- end }}
    {{- with $w.env }}
    env:
{{- include "big.env" (list $root .) | nindent 6 }}
    {{- end }}
    {{- with $w.ports }}
    ports:
    {{- range . }}
      - name: {{ .name }}
        containerPort: {{ .targetPort | default .port }}
    {{- end }}
    {{- end }}
    {{- with $w.probe }}
    readinessProbe:
{{- toYaml . | nindent 6 }}
    {{- end }}
    {{- with $w.resources }}
    resources:
{{- toYaml . | nindent 6 }}
    {{- end }}
    {{- if or $w.files $w.data }}
    volumeMounts:
    {{- range $w.files }}
      - name: {{ .configMap }}
        mountPath: {{ .mountPath }}
        {{- with .subPath }}
        subPath: {{ . }}
        {{- end }}
        readOnly: true
    {{- end }}
    {{- with $w.data }}
      - name: data
        mountPath: {{ .mountPath }}
    {{- end }}
    {{- end }}
{{- if or $w.files $w.data }}
volumes:
{{- range $w.files }}
  - name: {{ .configMap }}
    configMap:
      name: {{ .configMap }}
      {{- with .defaultMode }}
      defaultMode: {{ . }}
      {{- end }}
{{- end }}
{{- with $w.data }}
  - name: data
    {{- if $root.Values.persistence.storageClass }}
    persistentVolumeClaim:
      claimName: {{ $name }}-data
    {{- else }}
    # No StorageClass configured: the databases are emptyDir, so the stack needs
    # no CSI driver to come up. Data then lives as long as the pod does — see
    # docs/runbooks/kubernetes-talos.md for switching on local-path.
    emptyDir: {}
    {{- end }}
{{- end }}
{{- end }}
{{- end -}}

{{/* Image ref: `own: true` workloads are built from this repo, everything else is upstream. */}}
{{- define "big.image" -}}
{{- $root := .root -}}
{{- $w := .w -}}
{{- if $w.own -}}
{{- $ref := printf "%s/%s:%s" $root.Values.images.repositoryPrefix .name $root.Values.images.tag -}}
{{- with $root.Values.images.registry }}{{ printf "%s/%s" . $ref }}{{ else }}{{ $ref }}{{ end }}
{{- else -}}
{{- $w.image -}}
{{- end -}}
{{- end -}}

{{/*
Env list from a map. Every value is run through `tpl`, so values.yaml can name
cluster-internal hosts ({{ .Release.Namespace }}) and the node address
({{ .Values.host }}) without the chart hard-coding either.
*/}}
{{- define "big.env" -}}
{{- $root := index . 0 -}}
{{- range $k, $v := index . 1 }}
- name: {{ $k }}
  value: {{ tpl (toString $v) $root | quote }}
{{- end }}
{{- end -}}

{{- define "big.labels" -}}
app.kubernetes.io/name: {{ .name }}
app.kubernetes.io/instance: {{ .root.Release.Name }}
app.kubernetes.io/managed-by: Helm
{{- end -}}