Working through node and group configuration via CLI

internal/app/wwctl/group/delete/main.go

@@ -1,8 +1,61 @@
 package delete
 
-import "github.com/spf13/cobra"
+import (
+	"fmt"
+	"github.com/hpcng/warewulf/internal/pkg/node"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"github.com/manifoldco/promptui"
+	"github.com/spf13/cobra"
+	"os"
+)
 
 func CobraRunE(cmd *cobra.Command, args []string) error {
+	var count int
+	var numNodes int
+
+	nodeDB, err := node.New()
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "Failed to open node database: %s\n", err)
+		os.Exit(1)
+	}
+
+	nodes, err := nodeDB. FindAllNodes()
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "Could not load all nodes: %s\n", err)
+		os.Exit(1)
+	}
+
+	for _, g := range args {
+		err := nodeDB.DelGroup(g)
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "%s\n", err)
+		} else {
+			for _, n := range nodes {
+				if n.GroupName == g {
+					numNodes ++
+				}
+			}
+			count ++
+		}
+	}
+
+	if count > 0 {
+		q := fmt.Sprintf("Are you sure you want to delete %d group(s) (%d nodes)", count, numNodes)
+
+		prompt := promptui.Prompt{
+			Label:     q,
+			IsConfirm: true,
+		}
+
+		result, _ := prompt.Run()
+
+		if result == "y" || result == "yes" {
+			nodeDB.Persist()
+		}
+
+	} else {
+		wwlog.Printf(wwlog.INFO, "No groups found\n")
+	}
 
 	return nil
 }

internal/app/wwctl/group/delete/root.go

@@ -4,7 +4,7 @@ import "github.com/spf13/cobra"
 
 var (
 	baseCmd = &cobra.Command{
-		Use:                "del",
+		Use:                "delete",
 		Short:              "Add a new node group",
 		Long:               "Add a new node group ",
 		RunE:				CobraRunE,