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package image
import (
"fmt"
"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
registry string
name string
tag string
isTagged bool
hasRegistry bool
}
// Registries must contain a ":" or a "." or be localhost
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.name, "/")
return splitImageName[len(splitImageName)-1], nil
}
// decompose breaks an input name into an imageParts description
func decompose(input string) (imageParts, error) {
var (
parts imageParts
hasRegistry bool
tag string
)
imgRef, err := reference.Parse(input)
if err != nil {
return parts, err
}
unnormalizedNamed := imgRef.(reference.Named)
ntag, isTagged := imgRef.(reference.NamedTagged)
if !isTagged {
tag = "latest"
if _, hasDigest := imgRef.(reference.Digested); hasDigest {
tag = "none"
}
} else {
tag = ntag.Tag()
}
registry := reference.Domain(unnormalizedNamed)
imageName := reference.Path(unnormalizedNamed)
// Is this a registry or a repo?
if isRegistry(registry) {
hasRegistry = true
} else {
if registry != "" {
imageName = registry + "/" + imageName
registry = ""
}
}
return imageParts{
unnormalizedRef: unnormalizedNamed,
registry: registry,
hasRegistry: hasRegistry,
name: imageName,
tag: tag,
isTagged: isTagged,
}, nil
}
// 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
}
// assemble concatenates an image's parts into a string
func (ip *imageParts) assemble() string {
spec := fmt.Sprintf("%s:%s", ip.name, ip.tag)
if ip.registry != "" {
spec = fmt.Sprintf("%s/%s", ip.registry, spec)
}
return spec
}
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