Add EnsureContainer utilities

Signed-off-by: Arnob kumar saha <[email protected]>

util/container.go

@@ -0,0 +1,50 @@
+/*
+Copyright AppsCode Inc. and Contributors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	core_util "kmodules.xyz/client-go/core/v1"
+	ofstv2 "kmodules.xyz/offshoot-api/api/v2"
+
+	core "k8s.io/api/core/v1"
+)
+
+// EnsureContainerExists ensures that given container either exits by default or
+// it will create the container, then insert it to the podTemplate and return a pointer of that container
+func EnsureContainerExists(podTemplate *ofstv2.PodTemplateSpec, containerName string) *core.Container {
+	container := core_util.GetContainerByName(podTemplate.Spec.Containers, containerName)
+	if container == nil {
+		container = &core.Container{
+			Name: containerName,
+		}
+	}
+	podTemplate.Spec.Containers = core_util.UpsertContainer(podTemplate.Spec.Containers, *container)
+	return core_util.GetContainerByName(podTemplate.Spec.Containers, containerName)
+}
+
+// EnsureInitContainerExists ensures that given initContainer either exits by default or
+// it will create the initContainer, then insert it to the podTemplate and return a pointer of that initContainer
+func EnsureInitContainerExists(podTemplate *ofstv2.PodTemplateSpec, containerName string) *core.Container {
+	container := core_util.GetContainerByName(podTemplate.Spec.InitContainers, containerName)
+	if container == nil {
+		container = &core.Container{
+			Name: containerName,
+		}
+	}
+	podTemplate.Spec.InitContainers = core_util.UpsertContainer(podTemplate.Spec.InitContainers, *container)
+	return core_util.GetContainerByName(podTemplate.Spec.InitContainers, containerName)
+}