added wwctl container shell

internal/app/wwctl/container/shell/root.go

@@ -0,0 +1,35 @@
+package shell
+
+import (
+	"github.com/hpcng/warewulf/internal/pkg/container"
+	"github.com/spf13/cobra"
+)
+
+var (
+	baseCmd = &cobra.Command{
+		DisableFlagsInUseLine: true,
+		Use:                   "shell [OPTIONS] CONTAINER",
+		Short:                 "Run a shell inside of a Warewulf container",
+		Long:                  "Run a interactive shell inside of a warewulf CONTAINER.\n",
+		RunE:                  CobraRunE,
+		Args:                  cobra.MinimumNArgs(1),
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			if len(args) != 0 {
+				return nil, cobra.ShellCompDirectiveNoFileComp
+			}
+			list, _ := container.ListSources()
+			return list, cobra.ShellCompDirectiveNoFileComp
+		},
+		FParseErrWhitelist: cobra.FParseErrWhitelist{UnknownFlags: true},
+	}
+	binds []string
+)
+
+func init() {
+	baseCmd.PersistentFlags().StringArrayVarP(&binds, "bind", "b", []string{}, "Bind a local path into the container (must exist)")
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}