pull in containers/image deps

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

vendor/github.com/containers/image/transports/transports.go

@@ -0,0 +1,55 @@
+package transports
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/containers/image/directory"
+	"github.com/containers/image/docker"
+	"github.com/containers/image/oci"
+	"github.com/containers/image/openshift"
+	"github.com/containers/image/types"
+)
+
+// KnownTransports is a registry of known ImageTransport instances.
+var KnownTransports map[string]types.ImageTransport
+
+func init() {
+	KnownTransports = make(map[string]types.ImageTransport)
+	for _, t := range []types.ImageTransport{
+		directory.Transport,
+		docker.Transport,
+		oci.Transport,
+		openshift.Transport,
+	} {
+		name := t.Name()
+		if _, ok := KnownTransports[name]; ok {
+			panic(fmt.Sprintf("Duplicate image transport name %s", name))
+		}
+		KnownTransports[name] = t
+	}
+}
+
+// ParseImageName converts a URL-like image name to a types.ImageReference.
+func ParseImageName(imgName string) (types.ImageReference, error) {
+	parts := strings.SplitN(imgName, ":", 2)
+	if len(parts) != 2 {
+		return nil, fmt.Errorf(`Invalid image name "%s", expected colon-separated transport:reference`, imgName)
+	}
+	transport, ok := KnownTransports[parts[0]]
+	if !ok {
+		return nil, fmt.Errorf(`Invalid image name "%s", unknown transport "%s"`, imgName, parts[0])
+	}
+	return transport.ParseReference(parts[1])
+}
+
+// ImageName converts a types.ImageReference into an URL-like image name, which MUST be such that
+// ParseImageName(ImageName(reference)) returns an equivalent reference.
+//
+// This is the generally recommended way to refer to images in the UI.
+//
+// NOTE: The returned string is not promised to be equal to the original input to ParseImageName;
+// e.g. default attribute values omitted by the user may be filled in in the return value, or vice versa.
+func ImageName(ref types.ImageReference) string {
+	return ref.Transport().Name() + ":" + ref.StringWithinTransport()
+}