A custom slimmed down version of VolumeSource

Slim down VolumeSource by removing deprecated and "removed"
fields from the struct. This will slim down our nested
use of ExtraMounts

Also, adds ConvertVolumeSource function to the storage module
which converts from VolumeSource to a corev1.VolumeSource

Author: dprince

modules/storage/storage.go

@@ -13,6 +13,7 @@ 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
 
@@ -40,6 +41,74 @@ 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"`
+	// photonPersistentDisk represents a PhotonController persistent disk attached and mounted on kubelets host machine
+	PhotonPersistentDisk *corev1.PhotonPersistentDiskVolumeSource `json:"photonPersistentDisk,omitempty" protobuf:"bytes,23,opt,name=photonPersistentDisk"`
+	// projected items for all in one resources secrets, configmaps, and downward API
+	Projected *corev1.ProjectedVolumeSource `json:"projected,omitempty" protobuf:"bytes,26,opt,name=projected"`
+	// 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"`
+	// ephemeral represents a volume that is handled by a cluster storage driver.
+	// The volume's lifecycle is tied to the pod that defines it - it will be created before the pod starts,
+	// and deleted when the pod is removed.
+	//
+	// +optional
+	Ephemeral *corev1.EphemeralVolumeSource `json:"ephemeral,omitempty" protobuf:"bytes,29,opt,name=ephemeral"`
+}
+
+// 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 +119,7 @@ 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 +151,25 @@ func (v *VolMounts) Propagate(svc []PropagationType) []VolMounts {
 
 	return vl
 }
+
+// ConvertVolumeSource function to convert from a VolumeSource to a corev1.VolumeSource
+func ConvertVolumeSource(v *VolumeSource) corev1.VolumeSource {
+	return corev1.VolumeSource{
+		HostPath:              v.HostPath,
+		EmptyDir:              v.EmptyDir,
+		Secret:                v.Secret,
+		NFS:                   v.NFS,
+		ISCSI:                 v.ISCSI,
+		PersistentVolumeClaim: v.PersistentVolumeClaim,
+		CephFS:                v.CephFS,
+		DownwardAPI:           v.DownwardAPI,
+		FC:                    v.FC,
+		ConfigMap:             v.ConfigMap,
+		PhotonPersistentDisk:  v.PhotonPersistentDisk,
+		Projected:             v.Projected,
+		ScaleIO:               v.ScaleIO,
+		StorageOS:             v.StorageOS,
+		CSI:                   v.CSI,
+		Ephemeral:             v.Ephemeral,
+	}
+}