Method AddLink

object.go:758–800

AddLink will add a link to another object if it's not deleted and not another link name is the name of this link object obj is what is being linked too

(name string, obj *ObjectInfo)

// name is the name of this link object
// obj is what is being linked too
func (obs *obs) AddLink(name string, obj *ObjectInfo) (*ObjectInfo, error) {
	if name == "" {
		return nil, ErrNameRequired
	}

	// TODO Handle stale info

	if obj == nil || obj.Name == "" {
		return nil, ErrObjectRequired
	}
	if obj.Deleted {
		return nil, ErrNoLinkToDeleted
	}
	if obj.isLink() {
		return nil, ErrNoLinkToLink
	}

	// If object with link's name is found, error.
	// If link with link's name is found, that's okay to overwrite.
	// If there was an error that was not ErrObjectNotFound, error.
	einfo, err := obs.GetInfo(name, GetObjectInfoShowDeleted())
	if einfo != nil {
		if !einfo.isLink() {
			return nil, ErrObjectAlreadyExists
		}
	} else if err != ErrObjectNotFound {
		return nil, err
	}

	// create the meta for the link
	meta := &ObjectMeta{
		Name: name,
		Opts: &ObjectMetaOptions{Link: &ObjectLink{Bucket: obj.Bucket, Name: obj.Name}},
	}
	info := &ObjectInfo{Bucket: obs.name, NUID: nuid.Next(), ModTime: time.Now().UTC(), ObjectMeta: *meta}

	// put the link object
	if err = publishMeta(info, obs.js); err != nil {
		return nil, err
	}

	return info, nil
}

// AddBucketLink will add a link to another object store.
func (ob *obs) AddBucketLink(name string, bucket ObjectStore) (*ObjectInfo, error) {