func (bdc *cache) RecordKnownLocation(transport types.ImageTransport, scope types.BICTransportScope, blobDigest digest.Digest, location types.BICLocationReference) {
	_ = bdc.update(func(tx *bolt.Tx) error {
		b, err := tx.CreateBucketIfNotExists(knownLocationsBucket)
		if err != nil {
			return err
		}
		b, err = b.CreateBucketIfNotExists([]byte(transport.Name()))
		if err != nil {
			return err
		}
		b, err = b.CreateBucketIfNotExists([]byte(scope.Opaque))
		if err != nil {
			return err
		}
		b, err = b.CreateBucketIfNotExists([]byte(blobDigest.String()))
		if err != nil {
			return err
		}
		value, err := time.Now().MarshalBinary()
		if err != nil {
			return err
		}
		if err := b.Put([]byte(location.Opaque), value); err != nil { // Possibly overwriting an older entry.
			return err
		}
		return nil
	}) // FIXME? Log error (but throttle the log volume on repeated accesses)?
}
func (bdc *cache) RecordKnownLocation(transport types.ImageTransport, scope types.BICTransportScope, blobDigest digest.Digest, location types.BICLocationReference) {
	_ = bdc.update(func(tx *bolt.Tx) error {
		b, err := tx.CreateBucketIfNotExists(knownLocationsBucket)
		if err != nil {
			return err
		}
		b, err = b.CreateBucketIfNotExists([]byte(transport.Name()))
		if err != nil {
			return err
		}
		b, err = b.CreateBucketIfNotExists([]byte(scope.Opaque))
		if err != nil {
			return err
		}
		b, err = b.CreateBucketIfNotExists([]byte(blobDigest.String()))
		if err != nil {
			return err
		}
		value, err := time.Now().MarshalBinary()
		if err != nil {
			return err
		}
		if err := b.Put([]byte(location.Opaque), value); err != nil { // Possibly overwriting an older entry.
			return err
		}
		return nil
	}) // FIXME? Log error (but throttle the log volume on repeated accesses)?
}
// RecordKnownLocation records that a blob with the specified digest exists within the specified (transport, scope) scope,
// and can be reused given the opaque location data.