Method addReferenceIfRefSpecMatches

remote.go:764–810

(rs config.RefSpec,
	remoteRefs storer.ReferenceStorer, localRef *plumbing.Reference,
	req *packp.ReferenceUpdateRequest, forceWithLease *ForceWithLease)

}

func (r *Remote) addReferenceIfRefSpecMatches(rs config.RefSpec,
	remoteRefs storer.ReferenceStorer, localRef *plumbing.Reference,
	req *packp.ReferenceUpdateRequest, forceWithLease *ForceWithLease) error {

	if localRef.Type() != plumbing.HashReference {
		return nil
	}

	if !rs.Match(localRef.Name()) {
		return nil
	}

	cmd := &packp.Command{
		Name: rs.Dst(localRef.Name()),
		Old:  plumbing.ZeroHash,
		New:  localRef.Hash(),
	}

	remoteRef, err := remoteRefs.Reference(cmd.Name)
	if err == nil {
		if remoteRef.Type() != plumbing.HashReference {
			// TODO: check actual git behavior here
			return nil
		}

		cmd.Old = remoteRef.Hash()
	} else if err != plumbing.ErrReferenceNotFound {
		return err
	}

	if cmd.Old == cmd.New {
		return nil
	}

	if forceWithLease != nil {
		if err = r.checkForceWithLease(localRef, cmd, forceWithLease); err != nil {
			return err
		}
	} else if !rs.IsForceUpdate() {
		if err := checkFastForwardUpdate(r.s, remoteRefs, cmd); err != nil {
			return err
		}
	}

	req.Commands = append(req.Commands, cmd)
	return nil
}

func (r *Remote) checkForceWithLease(localRef *plumbing.Reference, cmd *packp.Command, forceWithLease *ForceWithLease) error {
	remotePrefix := fmt.Sprintf("refs/remotes/%s/", r.Config().Name)