compat: remove deprecated VirtualSize

Since compat version 1.43 the VirtualSize field in the
GET /images/{name}/json, GET /images/json, and
GET /system/df responses is deprecated and will no
longer be included in API v1.44. Use the Size field
instead, which contains the same information.

Signed-off-by: Nicola Sella <nsella@redhat.com>

pkg/api/handlers/compat/images.go

@@ -19,6 +19,7 @@ import (
 	"github.com/containers/podman/v5/libpod"
 	"github.com/containers/podman/v5/pkg/api/handlers"
 	"github.com/containers/podman/v5/pkg/api/handlers/utils"
+	"github.com/containers/podman/v5/pkg/api/handlers/utils/apiutil"
 	api "github.com/containers/podman/v5/pkg/api/types"
 	"github.com/containers/podman/v5/pkg/auth"
 	"github.com/containers/podman/v5/pkg/domain/entities"
@@ -340,7 +341,7 @@ func GetImage(w http.ResponseWriter, r *http.Request) {
 		utils.Error(w, http.StatusNotFound, fmt.Errorf("failed to find image %s: %s", name, errMsg))
 		return
 	}
-	inspect, err := imageDataToImageInspect(r.Context(), newImage)
+	inspect, err := imageDataToImageInspect(r.Context(), newImage, r)
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("failed to convert ImageData to ImageInspect '%s': %w", name, err))
 		return
@@ -348,7 +349,7 @@ func GetImage(w http.ResponseWriter, r *http.Request) {
 	utils.WriteResponse(w, http.StatusOK, inspect)
 }
 
-func imageDataToImageInspect(ctx context.Context, l *libimage.Image) (*handlers.ImageInspect, error) {
+func imageDataToImageInspect(ctx context.Context, l *libimage.Image, r *http.Request) (*handlers.ImageInspect, error) {
 	options := &libimage.InspectOptions{WithParent: true, WithSize: true}
 	info, err := l.Inspect(ctx, options)
 	if err != nil {
@@ -407,8 +408,13 @@ func imageDataToImageInspect(ctx context.Context, l *libimage.Image) (*handlers.
 		RootFS:          rootfs,
 		Size:            info.Size,
 		Variant:         "",
-		VirtualSize:     info.VirtualSize,
 	}
+
+	if _, err := apiutil.SupportedVersion(r, "<1.44.0"); err == nil {
+		//nolint:staticcheck // Deprecated field
+		dockerImageInspect.VirtualSize = info.VirtualSize
+	}
+
 	return &handlers.ImageInspect{InspectResponse: dockerImageInspect}, nil
 }
 
@@ -482,6 +488,13 @@ func GetImages(w http.ResponseWriter, r *http.Request) {
 			if !query.SharedSize {
 				s.SharedSize = -1
 			}
+			// VirtualSize is deprecated in version 1.43 and removed in version 1.44
+			// See https://docs.docker.com/reference/api/engine/version-history/#v143-api-changes
+			if _, err := apiutil.SupportedVersion(r, "<1.44.0"); err == nil {
+				s.VirtualSize = s.Size
+			} else {
+				s.VirtualSize = 0
+			}
 		}
 	}
 	utils.WriteResponse(w, http.StatusOK, summaries)

pkg/api/handlers/compat/system.go

@@ -9,6 +9,7 @@ import (
 	"github.com/containers/podman/v5/libpod"
 	"github.com/containers/podman/v5/pkg/api/handlers"
 	"github.com/containers/podman/v5/pkg/api/handlers/utils"
+	"github.com/containers/podman/v5/pkg/api/handlers/utils/apiutil"
 	api "github.com/containers/podman/v5/pkg/api/types"
 	"github.com/containers/podman/v5/pkg/domain/entities"
 	"github.com/containers/podman/v5/pkg/domain/infra/abi"
@@ -41,8 +42,12 @@ func GetDiskUsage(w http.ResponseWriter, r *http.Request) {
 			RepoTags:    []string{o.Tag},
 			SharedSize:  o.SharedSize,
 			Size:        o.Size,
-			VirtualSize: o.Size - o.UniqueSize,
 		}
+
+		if _, err := apiutil.SupportedVersion(r, "<1.44.0"); err == nil {
+			t.VirtualSize = o.Size - o.UniqueSize //nolint:staticcheck // Deprecated field
+		}
+
 		imgs[i] = &t
 	}
 

pkg/domain/entities/types/images.go

@@ -16,7 +16,7 @@ type ImageSummary struct {
 	Created     int64
 	Size        int64
 	SharedSize  int
-	VirtualSize int64
+	VirtualSize int64 `json:",omitempty"`
 	Labels      map[string]string
 	Containers  int
 	ReadOnly    bool `json:",omitempty"`

test/apiv2/10-images.at

@@ -42,6 +42,14 @@ t GET images/json?filter=$IMAGE 200 \
   length=1 \
   .[0].Names[0]=$IMAGE
 
+# Test VirtualSize field is present in API v1.43 (backward compatibility)
+t GET /v1.43/images/json 200 \
+  .[0].VirtualSize~[0-9]\\+
+
+# Test VirtualSize field is no longer present in API v1.44+ (deprecated since API v1.43)
+t GET /v1.44/images/json 200 \
+  .[0].VirtualSize=null
+
 # Negative test case
 t GET images/json?filter=nonesuch 200 length=0
 
@@ -50,6 +58,14 @@ t GET images/$iid/json 200 \
   .Id=sha256:$iid \
   .RepoTags[0]=$IMAGE
 
+# Test VirtualSize field is present in API v1.43 for single image inspect (backward compatibility)
+t GET /v1.43/images/$iid/json 200 \
+  .VirtualSize~[0-9]\\+
+
+# Test VirtualSize field is no longer present in API v1.44+ for single image inspect (deprecated since API v1.43)
+t GET /v1.44/images/$iid/json 200 \
+  .VirtualSize=null
+
 t POST "images/create?fromImage=alpine" 200 .error~null .status~".*Download complete.*"
 t POST "libpod/images/pull?reference=alpine&compatMode=true" 200 .error~null .status~".*Download complete.*"
 

test/apiv2/45-system.at

@@ -38,6 +38,27 @@ cid=$(jq -r '.Id' <<<"$output")
 t GET system/df 200 '.LayersSize=12180391'
 t GET libpod/system/df 200 '.ImagesSize=12180391'
 
+# VirtualSize was computed (somehow) in v1.43 so we need to
+# build an image to test that the value is returned
+# in API <= v1.43.
+IIDFILE=$(mktemp)
+podman build --iidfile $IIDFILE -<< EOF
+FROM $IMAGE
+RUN :
+EOF
+
+# Test VirtualSize field is present in API v1.43 for system/df (backward compatibility)
+t GET /v1.43/system/df 200 \
+    .Images[0].Size~[0-9]\\+ \
+    .Images[0].VirtualSize~[0-9]\\+
+
+# Test VirtualSize field is no longer present in API v1.44+ for system/df (deprecated since API v1.43)
+t GET /v1.44/system/df 200 \
+    .Images[0].Size~[0-9]\\+ \
+    .Images[0].VirtualSize=null
+
+podman rmi -f $(< $IIDFILE)
+
 # Verify that one container references the volume
 t GET system/df 200 '.Volumes[0].UsageData.RefCount=1'
 
@@ -91,3 +112,5 @@ t POST 'libpod/system/prune?volumes=true&filters={"label":["testlabel1"]}' param
 t POST 'libpod/system/prune?volumes=true' params='' 200 .VolumePruneReports[0].Id=foo1
 
 # TODO add other system prune tests for pods / images
+
+# vim: filetype=sh