A custom slimmed down version of VolumeSource

modules/storage/storage.go

@@ -13,10 +13,14 @@ 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.
 */
+// +kubebuilder:object:generate:=true
 
 package storage
 
 import (
+	"encoding/json"
+	"fmt"
+
 	corev1 "k8s.io/api/core/v1"
 )
 
@@ -40,6 +44,64 @@ const (
 	Compute PropagationType = "Compute"
 )
 
+// VolumeSource our slimmed down version of the VolumeSource struct with deprecated and "removed" fields removed to save space
+type VolumeSource struct {
+	HostPath *corev1.HostPathVolumeSource `json:"hostPath,omitempty" protobuf:"bytes,1,opt,name=hostPath"`
+	// emptyDir represents a temporary directory that shares a pod's lifetime.
+	// More info: https://kubernetes.io/docs/concepts/storage/volumes#emptydir
+	// +optional
+	EmptyDir *corev1.EmptyDirVolumeSource `json:"emptyDir,omitempty" protobuf:"bytes,2,opt,name=emptyDir"`
+	// secret represents a secret that should populate this volume.
+	// More info: https://kubernetes.io/docs/concepts/storage/volumes#secret
+	// +optional
+	Secret *corev1.SecretVolumeSource `json:"secret,omitempty" protobuf:"bytes,6,opt,name=secret"`
+	// nfs represents an NFS mount on the host that shares a pod's lifetime
+	// More info: https://kubernetes.io/docs/concepts/storage/volumes#nfs
+	// +optional
+	NFS *corev1.NFSVolumeSource `json:"nfs,omitempty" protobuf:"bytes,7,opt,name=nfs"`
+	// iscsi represents an ISCSI Disk resource that is attached to a
+	// kubelet's host machine and then exposed to the pod.
+	// More info: https://examples.k8s.io/volumes/iscsi/README.md
+	// +optional
+	ISCSI *corev1.ISCSIVolumeSource `json:"iscsi,omitempty" protobuf:"bytes,8,opt,name=iscsi"`
+	// persistentVolumeClaimVolumeSource represents a reference to a
+	// PersistentVolumeClaim in the same namespace.
+	// More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#persistentvolumeclaims
+	// +optional
+	PersistentVolumeClaim *corev1.PersistentVolumeClaimVolumeSource `json:"persistentVolumeClaim,omitempty" protobuf:"bytes,10,opt,name=persistentVolumeClaim"`
+	// cephFS represents a Ceph FS mount on the host that shares a pod's lifetime
+	// +optional
+	CephFS *corev1.CephFSVolumeSource `json:"cephfs,omitempty" protobuf:"bytes,14,opt,name=cephfs"`
+	// downwardAPI represents downward API about the pod that should populate this volume
+	// +optional
+	DownwardAPI *corev1.DownwardAPIVolumeSource `json:"downwardAPI,omitempty" protobuf:"bytes,16,opt,name=downwardAPI"`
+	// fc represents a Fibre Channel resource that is attached to a kubelet's host machine and then exposed to the pod.
+	// +optional
+	FC *corev1.FCVolumeSource `json:"fc,omitempty" protobuf:"bytes,17,opt,name=fc"`
+	// configMap represents a configMap that should populate this volume
+	// +optional
+	ConfigMap *corev1.ConfigMapVolumeSource `json:"configMap,omitempty" protobuf:"bytes,19,opt,name=configMap"`
+	// scaleIO represents a ScaleIO persistent volume attached and mounted on Kubernetes nodes.
+	// +optional
+	ScaleIO *corev1.ScaleIOVolumeSource `json:"scaleIO,omitempty" protobuf:"bytes,25,opt,name=scaleIO"`
+	// storageOS represents a StorageOS volume attached and mounted on Kubernetes nodes.
+	// +optional
+	StorageOS *corev1.StorageOSVolumeSource `json:"storageos,omitempty" protobuf:"bytes,27,opt,name=storageos"`
+	// csi (Container Storage Interface) represents ephemeral storage that is handled by certain external CSI drivers (Beta feature).
+	// +optional
+	CSI *corev1.CSIVolumeSource `json:"csi,omitempty" protobuf:"bytes,28,opt,name=csi"`
+}
+
+// Volume our slimmed down version of Volume
+type Volume struct {
+	// +kubebuilder:validation:Required
+	// Name of the volume
+	Name string `json:"name"`
+	// +kubebuilder:validation:Required
+	// VolumeSource defines the source of a volume to be mounted
+	VolumeSource VolumeSource `json:"volumeSource"`
+}
+
 // VolMounts is the data structure used to expose Volumes and Mounts that can
 // be added to a pod according to the defined Propagation policy
 type VolMounts struct {
@@ -50,7 +112,7 @@ type VolMounts struct {
 	// +kubebuilder:validation:Optional
 	ExtraVolType ExtraVolType `json:"extraVolType,omitempty"`
 	// +kubebuilder:validation:Required
-	Volumes []corev1.Volume `json:"volumes"`
+	Volumes []Volume `json:"volumes"`
 	// +kubebuilder:validation:Required
 	Mounts []corev1.VolumeMount `json:"mounts"`
 }
@@ -82,3 +144,20 @@ func (v *VolMounts) Propagate(svc []PropagationType) []VolMounts {
 
 	return vl
 }
+
+// ToCoreVolumeSource - convert VolumeSource to corev1.VolumeSource
+func (s *VolumeSource) ToCoreVolumeSource() (*corev1.VolumeSource, error) {
+	coreVolumeSource := &corev1.VolumeSource{}
+
+	coreVolumeBytes, err := json.Marshal(s)
+	if err != nil {
+		return nil, fmt.Errorf("error marshalling VolumeSource: %w", err)
+	}
+
+	err = json.Unmarshal(coreVolumeBytes, coreVolumeSource)
+	if err != nil {
+		return nil, fmt.Errorf("error unmarshalling VolumeSource: %w", err)
+	}
+
+	return coreVolumeSource, nil
+}