Method ImageInCache

src/cmd/linuxkit/cache/write.go:385–420

(ref *reference.Spec, trustedRef, architecture string)

}

func (p *Provider) ImageInCache(ref *reference.Spec, trustedRef, architecture string) (bool, error) {
	img, err := p.findImage(ref.String(), imagespec.Platform{OS: linux, Architecture: architecture})
	if err != nil {
		return false, err
	}
	// findImage only checks if we had the pointer to it; it does not check if it is complete.
	// We need to do that next.

	// check that all of the layers exist
	layers, err := img.Layers()
	if err != nil {
		return false, fmt.Errorf("layers not found: %v", err)
	}
	for _, layer := range layers {
		dig, err := layer.Digest()
		if err != nil {
			return false, fmt.Errorf("unable to get digest of layer: %v", err)
		}
		var rc io.ReadCloser
		if rc, err = p.cache.Blob(dig); err != nil {
			return false, fmt.Errorf("layer %s not found: %v", dig, err)
		}
		_ = rc.Close()
	}
	// check that the config exists
	config, err := img.ConfigName()
	if err != nil {
		return false, fmt.Errorf("unable to get config: %v", err)
	}
	var rc io.ReadCloser
	if rc, err = p.cache.Blob(config); err != nil {
		return false, fmt.Errorf("config %s not found: %v", config, err)
	}
	_ = rc.Close()
	return true, nil
}

// ImageInRegistry takes an image name and checks that the image manifest or index to which it refers
// exists in the registry.