create: do not calculate image size

calculating the image size can be an expensive operation.  Avoid doing
it when creating a new container since the size is not needed.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

cmd/podman/shared/create.go

@@ -101,7 +101,7 @@ func CreateContainer(ctx context.Context, c *GenericCLIResults, runtime *libpod.
 		if err != nil {
 			return nil, nil, err
 		}
-		imageData, err = newImage.Inspect(ctx)
+		imageData, err = newImage.InspectNoSize(ctx)
 		if err != nil {
 			return nil, nil, err
 		}

libpod/image/image.go

@@ -916,12 +916,7 @@ func (i *Image) imageInspectInfo(ctx context.Context) (*types.ImageInspectInfo,
 	return i.inspectInfo, nil
 }
 
-// Inspect returns an image's inspect data
-func (i *Image) Inspect(ctx context.Context) (*inspect.ImageData, error) {
-	span, _ := opentracing.StartSpanFromContext(ctx, "imageInspect")
-	span.SetTag("type", "image")
-	defer span.Finish()
-
+func (i *Image) inspect(ctx context.Context, calculateSize bool) (*inspect.ImageData, error) {
 	ociv1Img, err := i.ociv1Image(ctx)
 	if err != nil {
 		ociv1Img = &ociv1.Image{}
@@ -936,8 +931,10 @@ func (i *Image) Inspect(ctx context.Context) (*inspect.ImageData, error) {
 	}
 
 	size := int64(-1)
-	if usize, err := i.Size(ctx); err == nil {
-		size = int64(*usize)
+	if calculateSize {
+		if usize, err := i.Size(ctx); err == nil {
+			size = int64(*usize)
+		}
 	}
 
 	repoTags, err := i.RepoTags()
@@ -1002,6 +999,26 @@ func (i *Image) Inspect(ctx context.Context) (*inspect.ImageData, error) {
 	return data, nil
 }
 
+// Inspect returns an image's inspect data
+func (i *Image) Inspect(ctx context.Context) (*inspect.ImageData, error) {
+	span, _ := opentracing.StartSpanFromContext(ctx, "imageInspect")
+
+	span.SetTag("type", "image")
+	defer span.Finish()
+
+	return i.inspect(ctx, true)
+}
+
+// InspectNoSize returns an image's inspect data without calculating the size for the image
+func (i *Image) InspectNoSize(ctx context.Context) (*inspect.ImageData, error) {
+	span, _ := opentracing.StartSpanFromContext(ctx, "imageInspectNoSize")
+
+	span.SetTag("type", "image")
+	defer span.Finish()
+
+	return i.inspect(ctx, false)
+}
+
 // Import imports and image into the store and returns an image
 func (ir *Runtime) Import(ctx context.Context, path, reference string, writer io.Writer, signingOptions SigningOptions, imageConfig ociv1.Image) (*Image, error) {
 	src, err := tarball.Transport.ParseReference(path)

libpod/runtime_pod_infra_linux.go

@@ -147,7 +147,7 @@ func (r *Runtime) createInfraContainer(ctx context.Context, p *Pod) (*Container,
 		return nil, err
 	}
 
-	data, err := newImage.Inspect(ctx)
+	data, err := newImage.InspectNoSize(ctx)
 	if err != nil {
 		return nil, err
 	}