package image import ( "strings" "github.com/containers/image/docker/reference" "github.com/pkg/errors" ) // imageParts describes the parts of an image's name type imageParts struct { unnormalizedRef reference.Named // WARNING: Did not go through docker.io[/library] normalization hasRegistry bool } // Registries must contain a ":" or a "." or be localhost; this helper exists for users of reference.Parse. // For inputs that should use the docker.io[/library] normalization, use reference.ParseNormalizedNamed instead. func isRegistry(name string) bool { return strings.ContainsAny(name, ".:") || name == "localhost" } // GetImageBaseName uses decompose and string splits to obtain the base // name of an image. Doing this here because it beats changing the // imageParts struct names to be exported as well. func GetImageBaseName(input string) (string, error) { decomposedImage, err := decompose(input) if err != nil { return "", err } splitImageName := strings.Split(decomposedImage.unnormalizedRef.Name(), "/") return splitImageName[len(splitImageName)-1], nil } // decompose breaks an input name into an imageParts description func decompose(input string) (imageParts, error) { imgRef, err := reference.Parse(input) if err != nil { return imageParts{}, err } unnormalizedNamed := imgRef.(reference.Named) // ip.unnormalizedRef, because it uses reference.Parse and not reference.ParseNormalizedNamed, // does not use the standard heuristics for domains vs. namespaces/repos, so we need to check // explicitly. hasRegistry := isRegistry(reference.Domain(unnormalizedNamed)) return imageParts{ unnormalizedRef: unnormalizedNamed, hasRegistry: hasRegistry, }, nil } // suspiciousRefNameTagValuesForSearch returns a "tag" value used in a previous implementation. // This exists only to preserve existing behavior in heuristic code; it’s dubious that that behavior is correct, // gespecially for the tag value. func (ip *imageParts) suspiciousRefNameTagValuesForSearch() (string, string, string) { registry := reference.Domain(ip.unnormalizedRef) imageName := reference.Path(ip.unnormalizedRef) // ip.unnormalizedRef, because it uses reference.Parse and not reference.ParseNormalizedNamed, // does not use the standard heuristics for domains vs. namespaces/repos. if registry != "" && !isRegistry(registry) { imageName = registry + "/" + imageName registry = "" } var tag string if tagged, isTagged := ip.unnormalizedRef.(reference.NamedTagged); isTagged { tag = tagged.Tag() } else if _, hasDigest := ip.unnormalizedRef.(reference.Digested); hasDigest { tag = "none" } else { tag = "latest" } return registry, imageName, tag } // referenceWithRegistry returns a (normalized) reference.Named composed of ip (with !ip.hasRegistry) // qualified with registry. func (ip *imageParts) referenceWithRegistry(registry string) (reference.Named, error) { if ip.hasRegistry { return nil, errors.Errorf("internal error: referenceWithRegistry called on imageParts with a registry (%#v)", *ip) } // We could build a reference.WithName+WithTag/WithDigest here, but we need to round-trip via a string // and a ParseNormalizedNamed anyway to get the right normalization of docker.io/library, so // just use a string directly. qualified := registry + "/" + ip.unnormalizedRef.String() ref, err := reference.ParseNormalizedNamed(qualified) if err != nil { return nil, errors.Wrapf(err, "error normalizing registry+unqualified reference %#v", qualified) } return ref, nil } // normalizedReference returns a (normalized) reference for ip (with ip.hasRegistry) func (ip *imageParts) normalizedReference() (reference.Named, error) { if !ip.hasRegistry { return nil, errors.Errorf("internal error: normalizedReference called on imageParts without a registry (%#v)", *ip) } // We need to round-trip via a string to get the right normalization of docker.io/library s := ip.unnormalizedRef.String() ref, err := reference.ParseNormalizedNamed(s) if err != nil { // Should never happen return nil, errors.Wrapf(err, "error normalizing qualified reference %#v", s) } return ref, nil }