Expose virtual size of VM images

With this change, we can do this:

  # kubectl get vmimages
  NAME          DISPLAY-NAME                                         SIZE          VIRTUALSIZE   AGE
  image-26r4s   sles15-sp5-minimal-vm.x86_64-kvm-and-xen-qu1.qcow2   267845632     25769803776   6m36s
  image-bgnhb   sle-micro.x86_64-5.5.0-default-qcow-gm.qcow2         1001652224    21474836480   20m
  image-nmmvj   sle-15-sp5-full-x86_64-gm-media1.iso                 14548992000   14548992000   19m

This in turn means we can update the UI to take image virtual size into
account when creating VMs.

Note that this requires the following Longhorn PRs, which have been
backported to longhorn 1.5.5 and 1.6.2:

- longhorn/backing-image-manager#208
- longhorn/longhorn-manager#2680
- longhorn/longhorn#8267

Related issue: harvester#4905

Signed-off-by: Tim Serong <tserong@suse.com>

api/openapi-spec/swagger.json

@@ -9547,6 +9547,10 @@
           },
           "storageClassName": {
             "type": "string"
+          },
+          "virtualSize": {
+            "type": "integer",
+            "format": "int64"
           }
         }
       },

deploy/charts/harvester-crd/templates/harvesterhci.io_virtualmachineimages.yaml

@@ -26,6 +26,9 @@ spec:
     - jsonPath: .status.size
       name: SIZE
       type: integer
+    - jsonPath: .status.virtualSize
+      name: VIRTUALSIZE
+      type: integer
     - jsonPath: .metadata.creationTimestamp
       name: AGE
       type: date
@@ -123,6 +126,9 @@ spec:
                 type: integer
               storageClassName:
                 type: string
+              virtualSize:
+                format: int64
+                type: integer
             type: object
         required:
         - spec

pkg/apis/harvesterhci.io/v1beta1/image.go

@@ -17,6 +17,7 @@ var (
 // +kubebuilder:resource:shortName=vmimage;vmimages,scope=Namespaced
 // +kubebuilder:printcolumn:name="DISPLAY-NAME",type=string,JSONPath=`.spec.displayName`
 // +kubebuilder:printcolumn:name="SIZE",type=integer,JSONPath=`.status.size`
+// +kubebuilder:printcolumn:name="VIRTUALSIZE",type=integer,JSONPath=`.status.virtualSize`
 // +kubebuilder:printcolumn:name="AGE",type="date",JSONPath=`.metadata.creationTimestamp`
 
 type VirtualMachineImage struct {
@@ -80,6 +81,9 @@ type VirtualMachineImageStatus struct {
 	// +optional
 	Size int64 `json:"size,omitempty"`
 
+	// +optional
+	VirtualSize int64 `json:"virtualSize,omitempty"`
+
 	// +optional
 	StorageClassName string `json:"storageClassName,omitempty"`
 

pkg/controller/master/image/backing_image_controller.go

@@ -37,7 +37,26 @@ func (h *backingImageHandler) OnChanged(_ string, backingImage *lhv1beta2.Backin
 	} else if err != nil {
 		return nil, err
 	}
-	if !harvesterv1beta1.ImageInitialized.IsTrue(vmImage) || !harvesterv1beta1.ImageImported.IsUnknown(vmImage) {
+	// There are two states that we care about here:
+	// - ImageInitialized
+	// - ImageImported
+	// If ImageInitialized isn't yet true, it means there's no backing
+	// image or storage class, so we've got nothing to work with yet and
+	// should return immediately.
+	if !harvesterv1beta1.ImageInitialized.IsTrue(vmImage) {
+		return nil, nil
+	}
+	// If ImageImported is not unknown, it means the backing image has
+	// been imported, and we think we know everything about it, i.e. we've
+	// now been through a series of progress updates during image download,
+	// and those are finally done, so let's not worry about further updates.
+	// The problem with this logic is that when we add new fields (e.g.
+	// VirtualSize), existing images won't pick up those newly added fields
+	// if we return here immediately.  So, now there's an additional check
+	// for that new field.  Another, simpler, alternative would be to just
+	// drop the ImageImported.IsUnknown check entirely, and let the following
+	// loop run through on every OnChanged event.
+	if !harvesterv1beta1.ImageImported.IsUnknown(vmImage) && vmImage.Status.VirtualSize == backingImage.Status.VirtualSize {
 		return nil, nil
 	}
 	toUpdate := vmImage.DeepCopy()
@@ -46,11 +65,16 @@ func (h *backingImageHandler) OnChanged(_ string, backingImage *lhv1beta2.Backin
 			toUpdate = handleFail(toUpdate, condition.Cond(harvesterv1beta1.ImageImported), fmt.Errorf(status.Message))
 			toUpdate.Status.Progress = status.Progress
 		} else if status.State == lhv1beta2.BackingImageStateReady || status.State == lhv1beta2.BackingImageStateReadyForTransfer {
-			harvesterv1beta1.ImageImported.True(toUpdate)
-			harvesterv1beta1.ImageImported.Reason(toUpdate, "Imported")
-			harvesterv1beta1.ImageImported.Message(toUpdate, status.Message)
 			toUpdate.Status.Progress = status.Progress
 			toUpdate.Status.Size = backingImage.Status.Size
+			toUpdate.Status.VirtualSize = backingImage.Status.VirtualSize
+			if toUpdate.Status.VirtualSize > 0 {
+				// We can't set ImageImported to True until we know the VirtualSize,
+				// which may happen one update after the image becomes ready.
+				harvesterv1beta1.ImageImported.True(toUpdate)
+				harvesterv1beta1.ImageImported.Reason(toUpdate, "Imported")
+				harvesterv1beta1.ImageImported.Message(toUpdate, status.Message)
+			}
 		} else if status.Progress != toUpdate.Status.Progress {
 			harvesterv1beta1.ImageImported.Unknown(toUpdate)
 			harvesterv1beta1.ImageImported.Reason(toUpdate, "Importing")