Fix missing confirmation for reset

The reset command is considered dangerous,
because it can destroy the whole cluster, hence
we should ask for confirmation first.

Signed-off-by: Christian Rebischke <chris@shibumi.dev>

pkg/cmd/reset.go

@@ -17,17 +17,19 @@ limitations under the License.
 package cmd
 
 import (
+	"fmt"
+
 	"github.com/MakeNowJust/heredoc/v2"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
-
 	"k8c.io/kubeone/pkg/state"
 	"k8c.io/kubeone/pkg/tasks"
 )
 
 type resetOpts struct {
 	globalOptions
+	AutoApprove    bool `longflag:"auto-approve" shortflag:"y"`
 	DestroyWorkers bool `longflag:"destroy-workers"`
 	RemoveBinaries bool `longflag:"remove-binaries"`
 }
@@ -68,6 +70,13 @@ func resetCmd(rootFlags *pflag.FlagSet) *cobra.Command {
 		},
 	}
 
+	cmd.Flags().BoolVarP(
+		&opts.AutoApprove,
+		longFlagName(opts, "AutoApprove"),
+		shortFlagName(opts, "AutoApprove"),
+		false,
+		"auto approve reset")
+
 	cmd.Flags().BoolVar(
 		&opts.DestroyWorkers,
 		longFlagName(opts, "DestroyWorkers"),
@@ -90,5 +99,23 @@ func runReset(opts *resetOpts) error {
 		return errors.Wrap(err, "failed to initialize State")
 	}
 
+	fmt.Println("The following nodes will be resetted: ")
+	for _, node := range s.Cluster.ControlPlane.Hosts {
+		fmt.Printf("\t+ reset control plane node %q (%s)\n", node.Hostname, node.PrivateAddress)
+	}
+	for _, node := range s.Cluster.StaticWorkers.Hosts {
+		fmt.Printf("\t+ reset static worker nodes %q (%s)\n", node.Hostname, node.PrivateAddress)
+	}
+
+	confirm, err := confirmApply(opts.AutoApprove)
+	if err != nil {
+		return err
+	}
+
+	if !confirm {
+		s.Logger.Println("Operation canceled.")
+		return nil
+	}
+
 	return errors.Wrap(tasks.WithReset(nil).Run(s), "failed to reset the cluster")
 }