Function ReadBlob

core/content/helpers.go:98–124

ReadBlob retrieves the entire contents of the blob from the provider. Avoid using this for large blobs, such as layers.

(ctx context.Context, provider Provider, desc ocispec.Descriptor)

//
// Avoid using this for large blobs, such as layers.
func ReadBlob(ctx context.Context, provider Provider, desc ocispec.Descriptor) ([]byte, error) {
	useData, err := useDescriptorData(desc)
	if err != nil {
		return nil, err
	}
	if useData {
		return desc.Data, nil
	}

	ra, err := provider.ReaderAt(ctx, desc)
	if err != nil {
		return nil, err
	}
	defer ra.Close()

	p := make([]byte, ra.Size())

	n, err := ra.ReadAt(p, 0)
	if err == io.EOF {
		if int64(n) != ra.Size() {
			err = io.ErrUnexpectedEOF
		} else {
			err = nil
		}
	}
	return p, err
}

// WriteBlob writes data with the expected digest into the content store. If
// expected already exists, the method returns immediately and the reader will