Add SeaweedFS update hook

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

packages/system/seaweedfs/templates/hook.yaml

@@ -0,0 +1,84 @@
+{{- $shouldRunUpdateHook := true }}
+{{- $configMap := lookup "v1" "ConfigMap" .Release.Namespace "seaweedfs-deployed-version" }}
+{{- if $configMap }}
+  {{- $deployedVersion := dig "data" "version" "0" $configMap }}
+  {{- if ge $deployedVersion "1" }}
+    {{- $shouldRunUpdateHook = false }}
+  {{- end }}
+{{- end }}
+
+{{- if $shouldRunUpdateHook }}
+---
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: seaweedfs-hook
+  annotations:
+    helm.sh/hook: pre-upgrade
+    helm.sh/hook-weight: "1"
+    helm.sh/hook-delete-policy: hook-succeeded,before-hook-creation
+spec:
+  template:
+    metadata:
+      labels:
+        policy.cozystack.io/allow-to-apiserver: "true"
+    spec:
+      serviceAccountName: seaweedfs-hook
+      containers:
+        - name: kubectl
+          image: bitnami/kubectl:latest
+          command:
+          - sh
+          args:
+            - -exc
+            - |-
+              kubectl --namespace={{ .Release.Namespace }} delete --cascade=orphan --ignore-not-found \
+                sts/seaweedfs-filer sts/seaweedfs-master sts/seaweedfs-volume deploy/seaweedfs-objectstorage-provisioner
+      restartPolicy: Never
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  annotations:
+    helm.sh/hook: pre-upgrade
+    helm.sh/hook-weight: "1"
+    helm.sh/hook-delete-policy: hook-succeeded,before-hook-creation
+  name: seaweedfs-hook
+rules:
+- apiGroups:
+  - "apps"
+  resources:
+  - statefulsets
+  - deployments
+  verbs:
+  - get
+  - list
+  - watch
+  - delete
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: seaweedfs-hook
+  annotations:
+    helm.sh/hook: pre-upgrade
+    helm.sh/hook-weight: "1"
+    helm.sh/hook-delete-policy: hook-succeeded,before-hook-creation
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: seaweedfs-hook
+subjects:
+  - kind: ServiceAccount
+    name: seaweedfs-hook
+    namespace: {{ .Release.Namespace | quote }}
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: seaweedfs-hook
+  annotations:
+    helm.sh/hook: pre-upgrade
+    helm.sh/hook-weight: "1"
+    helm.sh/hook-delete-policy: hook-succeeded,before-hook-creation
+{{- end }}

packages/system/seaweedfs/templates/version.yaml

@@ -0,0 +1,6 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: seaweedfs-deployed-version
+data:
+  version: "1"