initial work on single-container postgresql app (#758)

* initial work on single-container postgresql app

* update

* some more polish

* use new common version for postgresql

* fix a mistake

* moar fixup

* whoops

* fixes

* more fixing

* add pre-upgrade backup hook

* also add backup storage to questions.yaml

charts/stable/postgresql/templates/backup-postgres-config.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: "postgres-backup-hook-config-map"
+  annotations:
+    rollme: {{ randAlphaNum 5 | quote }}
+data:
+  entrypoint.sh: |-
+    #!/bin/sh
+    cmd="/docker-entrypoint.sh postgres"
+    eval "${cmd}" & disown;
+    until pg_isready; do
+      sleep 5;
+    done;
+    pg_dump -U $POSTGRES_USER -d {{ .Values.postgresqlDatabase }} > /backups/$BACKUP_NAME;

charts/stable/postgresql/templates/common.yaml

@@ -0,0 +1,2 @@
+
+{{ include "common.all" . }}

charts/stable/postgresql/templates/secret.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ include "common.names.fullname" . }}
+  labels:
+    {{- include "common.labels" . | nindent 4 }}
+  annotations:
+  {{- with .Values.annotations }}
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+type: Opaque
+data:
+  postgresql-password: {{ ( .Values.postgresqlPassword | default "empty" ) | b64enc | quote }}

charts/stable/postgresql/templates/upgrade-backup-postgres-hook.yaml

@@ -0,0 +1,58 @@
+{{- if .Values.ixChartContext -}}
+{{- if .Values.ixChartContext.isUpgrade -}}
+{{- $upgradeDict := .Values.ixChartContext.upgradeMetadata -}}
+{{ $values := (. | mustDeepCopy) }}
+---
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: "pre-upgrade-hook2"
+  annotations:
+    "helm.sh/hook": pre-upgrade
+    "helm.sh/hook-weight": "1"
+    "helm.sh/hook-delete-policy": hook-succeeded
+    rollme: {{ randAlphaNum 5 | quote }}
+spec:
+  template:
+    metadata:
+      name: "pre-upgrade-hook2"
+    spec:
+      restartPolicy: Never
+      containers:
+      - name: {{ .Chart.Name }}-postgres-backup
+        image: {{ printf "%v:%v" .Values.image.repository .Values.image.tag}}
+        imagePullPolicy: {{ .Values.image.pullPolicy }}
+        env:
+          - name: BACKUP_NAME
+            value: {{- printf "postgres-backup-from-%s-to-%s-revision-%d" $upgradeDict.oldChartVersion $upgradeDict.newChartVersion (int64 $upgradeDict.preUpgradeRevision) -}}
+          - name: PGDATA
+            value: {{ .Values.pgdatapath | quote }}
+          - name: POSTGRES_USER
+            value: {{ .Values.postgresqlUsername | quote  }}
+          - name: POSTGRES_DB
+            value: {{ .Values.postgresqlDatabase | quote  }}
+          - name: POSTGRES_PASSWORD
+            valueFrom:
+              secretKeyRef:
+                name: {{ ( .Values.existingSecret | default ( include "common.names.fullname" . ) ) | quote }}
+                key: "postgresql-password"
+        command:
+          - "/bin/backup_entrypoint.sh"
+        volumeMounts:
+          - name: backup-script-configmap
+            mountPath: /bin/backup_entrypoint.sh
+            readOnly: true
+            subPath: entrypoint.sh
+        {{- with (include "common.controller.volumeMounts" . | trim) }}
+          {{ nindent 4 . }}
+        {{- end }}
+      volumes:
+          - name: backup-script-configmap
+          configMap:
+            defaultMode: 0700
+            name: "postgres-backup-hook-config-map"
+      {{- with (include "common.controller.volumes" . | trim) }}
+        {{- nindent 2 . }}
+      {{- end }}
+{{- end -}}
+{{- end -}}