Function normalizeTaggedDigestedNamed

libimage/normalize.go:162–181

normalizeTaggedDigestedNamed strips the tag off the specified named reference iff it is tagged and digested. Note that the tag is entirely ignored to match Docker behavior.

(named reference.Named)

// reference iff it is tagged and digested. Note that the tag is entirely
// ignored to match Docker behavior.
func normalizeTaggedDigestedNamed(named reference.Named) (reference.Named, error) {
	_, isTagged := named.(reference.NamedTagged)
	if !isTagged {
		return named, nil
	}
	digested, isDigested := named.(reference.Digested)
	if !isDigested {
		return named, nil
	}

	// Now strip off the tag.
	newNamed := reference.TrimNamed(named)
	// And re-add the digest.
	newNamed, err := reference.WithDigest(newNamed, digested.Digest())
	if err != nil {
		return named, err
	}
	logrus.Debugf("Stripped off tag from tagged and digested reference %q", named.String())
	return newNamed, nil
}