package cmd import ( "context" "fmt" "os" "os/signal" "github.com/spf13/cobra" ) var rootCmd = &cobra.Command{ Use: "constellation", Short: "Manage your Constellation cluster", Long: "Manage your Constellation cluster.", PersistentPreRun: preRunRoot, } // Execute starts the CLI. func Execute() error { ctx, cancel := signalContext(context.Background(), os.Interrupt) defer cancel() return rootCmd.ExecuteContext(ctx) } // signalContext returns a context that is canceled on the handed signal. // The signal isn't watched after its first occurrence. Call the cancel // function to ensure the internal goroutine is stopped and the signal isn't // watched any longer. func signalContext(ctx context.Context, sig os.Signal) (context.Context, context.CancelFunc) { sigCtx, stop := signal.NotifyContext(ctx, sig) done := make(chan struct{}, 1) stopDone := make(chan struct{}, 1) go func() { defer func() { stopDone <- struct{}{} }() defer stop() select { case <-sigCtx.Done(): fmt.Println(" Signal caught. Press ctrl+c again to terminate the program immediately.") case <-done: } }() cancelFunc := func() { done <- struct{}{} <-stopDone } return sigCtx, cancelFunc } func init() { cobra.EnableCommandSorting = false // Set output of cmd.Print to stdout. (By default, it's stderr.) rootCmd.SetOut(os.Stdout) rootCmd.PersistentFlags().String("dev-config", "", "use settings from a development config") must(rootCmd.MarkPersistentFlagFilename("dev-config", "json")) rootCmd.AddCommand(newCreateCmd()) rootCmd.AddCommand(newInitCmd()) rootCmd.AddCommand(newVerifyCmd()) rootCmd.AddCommand(newRecoverCmd()) rootCmd.AddCommand(newTerminateCmd()) rootCmd.AddCommand(newVersionCmd()) } func preRunRoot(cmd *cobra.Command, args []string) { cmd.SilenceUsage = true } func must(err error) { if err != nil { panic(err) } }