Function newImageSource

storage/storage_src.go:63–96

newImageSource sets up an image for reading.

(sys *types.SystemContext, imageRef storageReference)

// newImageSource sets up an image for reading.
func newImageSource(sys *types.SystemContext, imageRef storageReference) (*storageImageSource, error) {
	// First, locate the image.
	img, err := imageRef.resolveImage(sys)
	if err != nil {
		return nil, err
	}

	// Build the reader object.
	image := &storageImageSource{
		PropertyMethodsInitialize: impl.PropertyMethods(impl.Properties{
			HasThreadSafeGetBlob: true,
		}),
		NoGetBlobAtInitialize: stubs.NoGetBlobAt(imageRef),

		imageRef:      imageRef,
		systemContext: sys,
		image:         img,
		metadata: storageImageMetadata{
			SignatureSizes:  []int{},
			SignaturesSizes: make(map[digest.Digest][]int),
		},
		getBlobMutexProtected: getBlobMutexProtected{
			digestToLayerID: make(map[digest.Digest]string),
			layerPosition:   make(map[digest.Digest]int),
		},
	}
	image.Compat = impl.AddCompat(image)
	if img.Metadata != "" {
		if err := json.Unmarshal([]byte(img.Metadata), &image.metadata); err != nil {
			return nil, fmt.Errorf("decoding metadata for source image: %w", err)
		}
	}
	return image, nil
}

// Reference returns the image reference that we used to find this image.
func (s *storageImageSource) Reference() types.ImageReference {