add restic integration for doing pod volume backups/restores

Signed-off-by: Steve Kriss <steve@heptio.com>

pkg/install/deployment.go

@@ -1,3 +1,19 @@
+/*
+Copyright 2018 the Heptio Ark 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 install
 
 import (
@@ -8,27 +24,44 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
-type deploymentOption func(*deploymentConfig)
+type podTemplateOption func(*podTemplateConfig)
 
-type deploymentConfig struct {
+type podTemplateConfig struct {
 	image                    string
 	withoutCredentialsVolume bool
+	envVars                  []corev1.EnvVar
 }
 
-func WithImage(image string) deploymentOption {
-	return func(c *deploymentConfig) {
+func WithImage(image string) podTemplateOption {
+	return func(c *podTemplateConfig) {
 		c.image = image
 	}
 }
 
-func WithoutCredentialsVolume() deploymentOption {
-	return func(c *deploymentConfig) {
+func WithoutCredentialsVolume() podTemplateOption {
+	return func(c *podTemplateConfig) {
 		c.withoutCredentialsVolume = true
 	}
 }
 
-func Deployment(namespace string, opts ...deploymentOption) *appsv1beta1.Deployment {
-	c := &deploymentConfig{
+func WithEnvFromSecretKey(varName, secret, key string) podTemplateOption {
+	return func(c *podTemplateConfig) {
+		c.envVars = append(c.envVars, corev1.EnvVar{
+			Name: varName,
+			ValueFrom: &corev1.EnvVarSource{
+				SecretKeyRef: &corev1.SecretKeySelector{
+					LocalObjectReference: corev1.LocalObjectReference{
+						Name: secret,
+					},
+					Key: key,
+				},
+			},
+		})
+	}
+}
+
+func Deployment(namespace string, opts ...podTemplateOption) *appsv1beta1.Deployment {
+	c := &podTemplateConfig{
 		image: "gcr.io/heptio-images/ark:latest",
 	}