refactor to overlay info

internal/app/wwctl/overlay/info/root.go

@@ -0,0 +1,38 @@
+package info
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/warewulf/warewulf/internal/pkg/overlay"
+)
+
+var (
+	baseCmd = &cobra.Command{
+		Use:     "info [flags] OVERLAY_NAME FILE_PATH",
+		Short:   "Show variables for a template file in an overlay",
+		Long:    "This command will show the variables for a given template file in a given\n" + "overlay.",
+		Aliases: []string{"vars", "tags", "information"},
+		Args:    cobra.ExactArgs(2),
+		RunE:    CobraRunE,
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			if len(args) == 0 {
+				return overlay.FindOverlays(), cobra.ShellCompDirectiveNoFileComp
+			} else if len(args) == 1 {
+				ov, err := overlay.Get(args[0])
+				if err != nil {
+					return nil, cobra.ShellCompDirectiveError
+				}
+				files, err := ov.GetFiles()
+				if err != nil {
+					return nil, cobra.ShellCompDirectiveError
+				}
+				return files, cobra.ShellCompDirectiveNoFileComp
+			}
+			return nil, cobra.ShellCompDirectiveNoFileComp
+		},
+	}
+)
+
+// GetCommand returns the root cobra.Command for this application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}