feat(zfspv): adding backup and restore support (#162)

This commit adds support for Backup and Restore controller, which will be watching for
the events. The velero plugin will create a Backup CR to create a backup
with the remote location information, the controller will send the data
to that remote location.

In the same way, the velero plugin will create a Restore CR to restore the
volume from the the remote location and the restore controller will restore
the data.

Steps to use velero plugin for ZFS-LocalPV are :

1. install velero

2. add openebs plugin

velero plugin add openebs/velero-plugin:latest

3. Create the volumesnapshot location :

for full backup :-

```yaml
apiVersion: velero.io/v1
kind: VolumeSnapshotLocation
metadata:
  name: default
  namespace: velero
spec:
  provider: openebs.io/zfspv-blockstore
  config:
    bucket: velero
    prefix: zfs
    namespace: openebs
    provider: aws
    region: minio
    s3ForcePathStyle: "true"
    s3Url: http://minio.velero.svc:9000
```

for incremental backup :-

```yaml
apiVersion: velero.io/v1
kind: VolumeSnapshotLocation
metadata:
  name: default
  namespace: velero
spec:
  provider: openebs.io/zfspv-blockstore
  config:
    bucket: velero
    prefix: zfs
    backup: incremental
    namespace: openebs
    provider: aws
    region: minio
    s3ForcePathStyle: "true"
    s3Url: http://minio.velero.svc:9000
```

4. Create backup

velero backup create my-backup --snapshot-volumes --include-namespaces=velero-ns --volume-snapshot-locations=aws-cloud-default --storage-location=default

5. Create Schedule

velero create schedule newschedule  --schedule="*/1 * * * *" --snapshot-volumes --include-namespaces=velero-ns --volume-snapshot-locations=aws-local-default --storage-location=default

6. Restore from backup

velero restore create --from-backup my-backup --restore-volumes=true --namespace-mappings velero-ns:ns1



Signed-off-by: Pawan <pawan@mayadata.io>

pkg/zfs/volume.go

@@ -19,6 +19,8 @@ import (
 	"strconv"
 
 	apis "github.com/openebs/zfs-localpv/pkg/apis/openebs.io/zfs/v1"
+	"github.com/openebs/zfs-localpv/pkg/builder/bkpbuilder"
+	"github.com/openebs/zfs-localpv/pkg/builder/restorebuilder"
 	"github.com/openebs/zfs-localpv/pkg/builder/snapbuilder"
 	"github.com/openebs/zfs-localpv/pkg/builder/volbuilder"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -45,6 +47,8 @@ const (
 	ZFSTopologyKey string = "openebs.io/nodename"
 	// ZFSStatusPending shows object has not handled yet
 	ZFSStatusPending string = "Pending"
+	// ZFSStatusFailed shows object operation has failed
+	ZFSStatusFailed string = "Failed"
 	// ZFSStatusReady shows object has been processed
 	ZFSStatusReady string = "Ready"
 )
@@ -63,7 +67,7 @@ var (
 func init() {
 
 	OpenEBSNamespace = os.Getenv(OpenEBSNamespaceKey)
-	if OpenEBSNamespace == "" {
+	if OpenEBSNamespace == "" && os.Getenv("OPENEBS_NODE_DRIVER") != "" {
 		klog.Fatalf("OPENEBS_NAMESPACE environment variable not set")
 	}
 	NodeID = os.Getenv("OPENEBS_NODE_ID")
@@ -256,3 +260,44 @@ func RemoveSnapFinalizer(snap *apis.ZFSSnapshot) error {
 	_, err := snapbuilder.NewKubeclient().WithNamespace(OpenEBSNamespace).Update(snap)
 	return err
 }
+
+// RemoveBkpFinalizer removes finalizer from ZFSBackup CR
+func RemoveBkpFinalizer(bkp *apis.ZFSBackup) error {
+	bkp.Finalizers = nil
+
+	_, err := bkpbuilder.NewKubeclient().WithNamespace(OpenEBSNamespace).Update(bkp)
+	return err
+}
+
+// UpdateBkpInfo updates the backup info with the status
+func UpdateBkpInfo(bkp *apis.ZFSBackup, status apis.ZFSBackupStatus) error {
+	finalizers := []string{ZFSFinalizer}
+	newBkp, err := bkpbuilder.BuildFrom(bkp).WithFinalizer(finalizers).Build()
+
+	// set the status
+	newBkp.Status = status
+
+	if err != nil {
+		klog.Errorf("Update backup failed %s err: %s", bkp.Spec.VolumeName, err.Error())
+		return err
+	}
+
+	_, err = bkpbuilder.NewKubeclient().WithNamespace(OpenEBSNamespace).Update(newBkp)
+	return err
+}
+
+// UpdateRestoreInfo updates the rstr info with the status
+func UpdateRestoreInfo(rstr *apis.ZFSRestore, status apis.ZFSRestoreStatus) error {
+	newRstr, err := restorebuilder.BuildFrom(rstr).Build()
+
+	// set the status
+	newRstr.Status = status
+
+	if err != nil {
+		klog.Errorf("Update snapshot failed %s err: %s", rstr.Spec.VolumeName, err.Error())
+		return err
+	}
+
+	_, err = restorebuilder.NewKubeclient().WithNamespace(OpenEBSNamespace).Update(newRstr)
+	return err
+}