rbd: return group not found error for Get,Delete RPC calls

We should return NotFound status if the group doesn't exists
for ControllerGetVolumeGroup RPC call.
And, an empty/OK response for DeleteVolumeGroup if the group
doesn't exists

Signed-off-by: Nikhil-Ladha <nikhilladha1999@gmail.com>

internal/csi-addons/rbd/volumegroup.go

@@ -18,10 +18,12 @@ package rbd
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"slices"
 
 	"github.com/ceph/ceph-csi/internal/rbd"
+	"github.com/ceph/ceph-csi/internal/rbd/group"
 	"github.com/ceph/ceph-csi/internal/rbd/types"
 	"github.com/ceph/ceph-csi/internal/util/log"
 
@@ -192,9 +194,15 @@ func (vs *VolumeGroupServer) DeleteVolumeGroup(
 	// resolve the volume group
 	vg, err := mgr.GetVolumeGroupByID(ctx, req.GetVolumeGroupId())
 	if err != nil {
+		if errors.Is(err, group.ErrRBDGroupNotFound) {
+			log.DebugLog(ctx, "VolumeGroup %q doesn't exists", req.GetVolumeGroupId())
+
+			return &volumegroup.DeleteVolumeGroupResponse{}, nil
+		}
+
 		return nil, status.Errorf(
-			codes.NotFound,
+			codes.Internal,
-			"could not find volume group %q: %s",
+			"could not fetch volume group %q: %s",
 			req.GetVolumeGroupId(),
 			err.Error())
 	}

internal/rbd/group/util.go

@@ -145,6 +145,12 @@ func (cvg *commonVolumeGroup) getVolumeGroupAttributes(ctx context.Context) (*jo
 		attrs = &journal.VolumeGroupAttributes{}
 	}
 
+	if attrs.GroupName == "" || attrs.CreationTime == nil {
+		log.ErrorLog(ctx, "volume group with id %v not found", cvg.id)
+
+		return nil, ErrRBDGroupNotFound
+	}
+
 	cvg.requestName = attrs.RequestName
 	cvg.name = attrs.GroupName
 	cvg.creationTime = attrs.CreationTime

internal/rbd/group/volume_group.go

@@ -22,6 +22,7 @@ import (
 	"fmt"
 
 	"github.com/ceph/go-ceph/rados"
+	librados "github.com/ceph/go-ceph/rados"
 	librbd "github.com/ceph/go-ceph/rbd"
 	"github.com/container-storage-interface/spec/lib/go/csi"
 	"github.com/csi-addons/spec/lib/go/volumegroup"
@@ -31,7 +32,10 @@ import (
 	"github.com/ceph/ceph-csi/internal/util/log"
 )
 
-var ErrRBDGroupNotConnected = errors.New("RBD group is not connected")
+var (
+	ErrRBDGroupNotConnected = fmt.Errorf("%w: RBD group is not connected", librados.ErrNotConnected)
+	ErrRBDGroupNotFound     = fmt.Errorf("%w: RBD group not found", librbd.ErrNotFound)
+)
 
 // volumeGroup handles all requests for 'rbd group' operations.
 type volumeGroup struct {