Confirmation on destructive commands

command/node_drain.go

@@ -27,6 +27,9 @@ Node Drain Options:
 
   -enable
     Enable draining for the specified node.
+
+  -yes
+    Automatic yes to prompts.
 `
 	return strings.TrimSpace(helpText)
 }
@@ -36,12 +39,13 @@ func (c *NodeDrainCommand) Synopsis() string {
 }
 
 func (c *NodeDrainCommand) Run(args []string) int {
-	var enable, disable bool
+	var enable, disable, autoYes bool
 
 	flags := c.Meta.FlagSet("node-drain", FlagSetClient)
 	flags.Usage = func() { c.Ui.Output(c.Help()) }
 	flags.BoolVar(&enable, "enable", false, "Enable drain mode")
 	flags.BoolVar(&disable, "disable", false, "Disable drain mode")
+	flags.BoolVar(&autoYes, "yes", false, "Automatic yes to prompts.")
 
 	if err := flags.Parse(args); err != nil {
 		return 1
@@ -108,13 +112,41 @@ func (c *NodeDrainCommand) Run(args []string) int {
 		c.Ui.Output(fmt.Sprintf("Prefix matched multiple nodes\n\n%s", formatList(out)))
 		return 0
 	}
+
 	// Prefix lookup matched a single node
 	node, _, err := client.Nodes().Info(nodes[0].ID, nil)
 	if err != nil {
 		c.Ui.Error(fmt.Sprintf("Error toggling drain mode: %s", err))
 		return 1
 	}
 
+	// Confirm drain if the node was a prefix match.
+	if nodeID != node.ID && !autoYes {
+		verb := "enable"
+		if disable {
+			verb = "disable"
+		}
+		question := fmt.Sprintf("Are you sure you want to %s drain mode for node %q? [y/N]", verb, node.ID)
+		answer, err := c.Ui.Ask(question)
+		if err != nil {
+			c.Ui.Error(fmt.Sprintf("Failed to parse answer: %v", err))
+			return 1
+		}
+
+		if answer == "" || strings.ToLower(answer)[0] == 'n' {
+			// No case
+			c.Ui.Output("Canceling drain toggle")
+			return 0
+		} else if strings.ToLower(answer)[0] == 'y' {
+			// Non exact match yes
+			c.Ui.Output("For confirmation, an exact ‘y’ is required.")
+			return 0
+		} else if answer != "y" {
+			c.Ui.Output("No confirmation detected. For confirmation, an exact 'y' is required.")
+			return 1
+		}
+	}
+
 	// Toggle node draining
 	if _, err := client.Nodes().ToggleDrain(node.ID, enable, nil); err != nil {
 		c.Ui.Error(fmt.Sprintf("Error toggling drain mode: %s", err))

command/stop.go

@@ -31,6 +31,9 @@ Stop Options:
     to the screen, which can be used to call up a monitor later if
     needed using the eval-monitor command.
 
+  -yes
+    Automatic yes to prompts.
+
   -verbose
     Display full information.
 `
@@ -42,12 +45,13 @@ func (c *StopCommand) Synopsis() string {
 }
 
 func (c *StopCommand) Run(args []string) int {
-	var detach, verbose bool
+	var detach, verbose, autoYes bool
 
 	flags := c.Meta.FlagSet("stop", FlagSetClient)
 	flags.Usage = func() { c.Ui.Output(c.Help()) }
 	flags.BoolVar(&detach, "detach", false, "")
 	flags.BoolVar(&verbose, "verbose", false, "")
+	flags.BoolVar(&autoYes, "yes", false, "")
 
 	if err := flags.Parse(args); err != nil {
 		return 1
@@ -104,6 +108,29 @@ func (c *StopCommand) Run(args []string) int {
 		return 1
 	}
 
+	// Confirm the stop if the job was a prefix match.
+	if jobID != job.ID && !autoYes {
+		question := fmt.Sprintf("Are you sure you want to stop job %q? [y/N]", job.ID)
+		answer, err := c.Ui.Ask(question)
+		if err != nil {
+			c.Ui.Error(fmt.Sprintf("Failed to parse answer: %v", err))
+			return 1
+		}
+
+		if answer == "" || strings.ToLower(answer)[0] == 'n' {
+			// No case
+			c.Ui.Output("Cancelling job stop")
+			return 0
+		} else if strings.ToLower(answer)[0] == 'y' {
+			// Non exact match yes
+			c.Ui.Output("For confirmation, an exact ‘y’ is required.")
+			return 0
+		} else if answer != "y" {
+			c.Ui.Output("No confirmation detected. For confirmation, an exact 'y' is required.")
+			return 1
+		}
+	}
+
 	// Invoke the stop
 	evalID, _, err := client.Jobs().Deregister(job.ID, nil)
 	if err != nil {

commands.go

@@ -18,6 +18,7 @@ func Commands(metaPtr *command.Meta) map[string]cli.CommandFactory {
 	meta := *metaPtr
 	if meta.Ui == nil {
 		meta.Ui = &cli.BasicUi{
+			Reader:      os.Stdin,
 			Writer:      os.Stdout,
 			ErrorWriter: os.Stderr,
 		}