Add imageParts.referenceWithRegistry

This is the primary goal of decompose()+assemble(), to support
qualifying an image name.

Does not have any users yet, so does not change behavior.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/libpod/image/parts.go b/libpod/image/parts.go
index b7c5d1252..8d059e35b 100644
--- a/libpod/image/parts.go
+++ b/libpod/image/parts.go
@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/containers/image/docker/reference"
+	"github.com/pkg/errors"
 )
 
 // imageParts describes the parts of an image's name
@@ -76,6 +77,23 @@ func decompose(input string) (imageParts, error) {
 	}, 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)