Introduce VolumeSnapshot APIs (#772)

api/api-rules/violation_exceptions.list

@@ -1,5 +1,6 @@
 API rule violation: names_match,github.com/appscode/go/encoding/json/types,IntHash,generation
 API rule violation: names_match,github.com/appscode/go/encoding/json/types,IntHash,hash
+API rule violation: names_match,github.com/appscode/stash/apis/stash/v1beta1,BackupTarget,VolumeSnapshotClassName
 API rule violation: names_match,k8s.io/api/core/v1,AzureDiskVolumeSource,DataDiskURI
 API rule violation: names_match,k8s.io/api/core/v1,ContainerStatus,LastTerminationState
 API rule violation: names_match,k8s.io/api/core/v1,DaemonEndpoint,Port

api/crds/v1beta1/backupconfiguration.yaml

@@ -326,6 +326,11 @@ spec:
               type: string
         spec:
           properties:
+            driver:
+              description: Driver indicates the name of the agent to use to backup
+                the target. Supported values are "Restic", "VolumeSnapshotter". Default
+                value is "Restic".
+              type: string
             paused:
               description: Indicates that the BackupConfiguration is paused from taking
                 backup. Default value is 'false'
@@ -1672,6 +1677,12 @@ spec:
                       type: string
                     name:
                       type: string
+                snapshotClassName:
+                  description: Name of the VolumeSnapshotClass used by the VolumeSnapshot.
+                    If not specified, a default snapshot class will be used if it
+                    is available. Use this field only if the "driver" field is set
+                    to "volumeSnapshotter".
+                  type: string
                 volumeMounts:
                   description: VolumeMounts specifies the volumes to mount inside
                     stash sidecar/init container Specify the volumes that contains
@@ -1763,8 +1774,6 @@ spec:
 
                     This format is intended to make it difficult to use these numbers without writing some sort of special handling code in the hopes that that will cause implementors to also use a fixed point implementation.
                   type: string
-          required:
-          - repository
   version: v1beta1
   versions:
   - name: v1beta1

apis/stash/v1beta1/backup_configuration_types.go

@@ -25,15 +25,21 @@ type BackupConfiguration struct {
 }
 
 type BackupConfigurationSpec struct {
+	Schedule string `json:"schedule,omitempty"`
+	// Driver indicates the name of the agent to use to backup the target.
+	// Supported values are "Restic", "VolumeSnapshotter".
+	// Default value is "Restic".
+	// +optional
+	Driver Snapshotter `json:"driver,omitempty"`
 	// Repository refer to the Repository crd that holds backend information
-	Repository core.LocalObjectReference `json:"repository"`
-	Schedule   string                    `json:"schedule,omitempty"`
+	// +optional
+	Repository core.LocalObjectReference `json:"repository,omitempty"`
 	// Task specify the Task crd that specifies the steps to take backup
 	// +optional
 	Task TaskRef `json:"task,omitempty"`
 	// Target specify the backup target
 	// +optional
-	Target *Target `json:"target,omitempty"`
+	Target *BackupTarget `json:"target,omitempty"`
 	// RetentionPolicy indicates the policy to follow to clean old backup snapshots
 	RetentionPolicy v1alpha1.RetentionPolicy `json:"retentionPolicy,omitempty"`
 	// Indicates that the BackupConfiguration is paused from taking backup. Default value is 'false'
@@ -62,3 +68,10 @@ type BackupConfigurationList struct {
 	metav1.ListMeta `json:"metadata,omitempty"`
 	Items           []BackupConfiguration `json:"items,omitempty"`
 }
+
+type Snapshotter string
+
+const (
+	ResticSnapshotter Snapshotter = "Restic"
+	VolumeSnapshotter Snapshotter = "VolumeSnapshotter"
+)