Add a version label (#613)

* Add a version label to the spilo pods (which might break / complicate inplace upgrades)

* Add comment

Author: eberlep

api/v1/postgres_types.go

@@ -62,6 +62,8 @@ const (
 	StandbyMethod = "streaming_host"
 	// PartitionIDLabelName Name of the managed-by label
 	PartitionIDLabelName string = "postgres.database.fits.cloud/partition-id"
+	// PostgresVersionLabelName Name of the version label
+	PostgresVersionLabelName string = "postgres.database.fits.cloud/version"
 
 	ApplicationLabelName             = "application"
 	ApplicationLabelValue            = "spilo"
@@ -679,6 +681,8 @@ func (p *Postgres) ToUnstructuredZalandoPostgresql(z *zalando.Postgresql, c *cor
 	// Add the newly introduced label only here, not in  p.ToZalandoPostgresqlMatchingLabels() (so that the selectors using  p.ToZalandoPostgresqlMatchingLabels() will still work until all postgres resources have that new label)
 	// TODO once all the custom resources have that new label, move this part to p.ToZalandoPostgresqlMatchingLabels()
 	z.Labels[PartitionIDLabelName] = p.Spec.PartitionID
+	// Add the additional version label to the custom resource
+	z.Labels[PostgresVersionLabelName] = p.Spec.Version
 
 	if image != "" {
 		z.Spec.DockerImage = image

main.go

@@ -254,6 +254,7 @@ func main() {
 		pgParamBlockList[blockedParam] = true
 	}
 
+	// be careful changing this value if you also set the pg.PostgresVersionLabelName inherited_label
 	viper.SetDefault(majorVersionUpgradeModeFlg, "manual")
 	majorVersionUpgradeMode = viper.GetString(majorVersionUpgradeModeFlg)
 

pkg/operatormanager/operatormanager.go

@@ -417,7 +417,7 @@ func (m *OperatorManager) editConfigMap(cm *corev1.ConfigMap, namespace string,
 	// set the reference to our custom pod environment secret
 	cm.Data["pod_environment_secret"] = PodEnvSecretName
 	// set the list of inherited labels that will be passed on to the pods
-	s := []string{pg.TenantLabelName, pg.ProjectIDLabelName, pg.UIDLabelName, pg.NameLabelName, pg.PartitionIDLabelName}
+	s := []string{pg.TenantLabelName, pg.ProjectIDLabelName, pg.UIDLabelName, pg.NameLabelName, pg.PartitionIDLabelName, pg.PostgresVersionLabelName}
 	// TODO maybe use a precompiled string here
 	cm.Data["inherited_labels"] = strings.Join(s, ",")