feat(helm): improve checks on storage drivers configuration and high …

…availability

helm/kube-image-keeper/templates/checks.tpl

@@ -0,0 +1,33 @@
+# High availability
+# =================
+{{ if and
+  (eq (include "kube-image-keeper.registry-stateless-mode" .) "false")
+  (gt (int .Values.registry.replicas) 1)
+  (ne .Values.registry.persistence.accessModes "ReadWriteMany")
+}}
+  {{ fail "Registry needs a configured S3/GCS/Azure storage driver or a PVC which supports ReadWriteMany to enable HA mode (>1 replicas), please enable minio, configure an external storage driver or provide a supported PVC." }}
+{{ end }}
+
+# Multiple storage
+# ================
+{{ $enabledOptions := list }}
+
+{{ if .Values.registry.persistence.enabled }}
+  {{ $enabledOptions = append $enabledOptions "registry.persistence.enabled" }}
+{{ end }}
+{{ if .Values.minio.enabled }}
+  {{ $enabledOptions = append $enabledOptions "minio.enabled" }}
+{{ end }}
+{{ if .Values.registry.persistence.s3 }}
+  {{ $enabledOptions = append $enabledOptions "registry.persistence.s3" }}
+{{ end }}
+{{ if .Values.registry.persistence.gcs }}
+  {{ $enabledOptions = append $enabledOptions "registry.persistence.gcs" }}
+{{ end }}
+{{ if .Values.registry.persistence.azure }}
+  {{ $enabledOptions = append $enabledOptions "registry.persistence.azure" }}
+{{ end }}
+
+{{ if gt (len $enabledOptions) 1 }}
+  {{ fail (printf "Multiple storage options enabled: %v. Please enable only one." $enabledOptions) }}
+{{ end }}

helm/kube-image-keeper/templates/registry-statefulset.yaml

@@ -1,9 +1,4 @@
 {{- if eq (include "kube-image-keeper.registry-stateless-mode" .) "false" }}
-
-{{- if and (gt (int .Values.registry.replicas) 1) (ne .Values.registry.persistence.accessModes "ReadWriteMany") -}}
-{{ fail "registry needs a configured S3 endpoint or a PVC which supports ReadWriteMany to enable HA mode (>1 replicas), please enable minio or configure an external S3 endpoint" }}
-{{- end }}
-
 apiVersion: apps/v1
 kind: StatefulSet
 metadata: