kubernetes/cmd/kubeadm/app/cmd/phases/init/showjoincommand.go

var initDoneTempl …

// NewShowJoinCommandPhase creates a kubeadm workflow phase that implements showing the join command.
func NewShowJoinCommandPhase() workflow.Phase { … }

// showJoinCommand prints the join command after all the phases in init have finished
func showJoinCommand(c workflow.RunData) error { … }

func printJoinCommand(out io.Writer, adminKubeConfigPath, token string, i InitData) error { … }