if err := Mkdir(dirPath, perm); err != nil {
		if osIsExist(err) {
			return nil
		}
		return err
	}

	return nil
}

// The buffer must be at least a block long.
// refer https://github.com/golang/go/issues/24015
const blockSize = 8 << 10 // 8192

// By default at least 128 entries in single getdents call (1MiB buffer)
var (
	direntPool = sync.Pool{

}

func (c *closeNotifier) Close() error {
	if c.done != nil {
		xioutil.SafeClose(c.done)
		c.done = nil
	}
	return c.rc.Close()
}

// keepHTTPReqResponseAlive can be used to avoid timeouts with long storage
// operations, such as bitrot verification or data usage scanning.
// Every 10 seconds a space character is sent.
// keepHTTPReqResponseAlive will wait for the returned body to be read before starting the ticker.

type Author struct {
	gorm.Model
}

type Book struct {
	gorm.Model
	Author   Author
	AuthorID uint
}

func (Book) TableName() string {
	return "my_schema.a_very_very_very_very_very_very_very_very_long_table_name"
}

func TestParseConstraintNameWithSchemaQualifiedLongTableName(t *testing.T) {
	s, err := schema.Parse(
		&Book{},
		&sync.Map{},
		schema.NamingStrategy{IdentifierMaxLength: 64},
	)

	if err != nil && !errors.Is(err, errNoSuchPolicy) {
		return err
	}

	return nil
}

// DeleteUser - deletes a user from storage and cache. This only used with
// long-term users and service accounts, not STS.
func (store *IAMStoreSys) DeleteUser(ctx context.Context, accessKey string, userType IAMUserType) error {
	if accessKey == "" {
		return errInvalidArgument
	}

	defaultProxyAdminPort = 15000
)

func ZtunnelConfig(ctx cli.Context) *cobra.Command {
	configCmd := &cobra.Command{
		Use:   "ztunnel-config",
		Short: "Update or retrieve current Ztunnel configuration.",
		Long:  "A group of commands used to update or retrieve Ztunnel configuration from a Ztunnel instance.",
		Example: `  # Retrieve summary about workload configuration
  istioctl x ztunnel-config workload

// errTooManyOpenFiles - too many open files.
var errTooManyOpenFiles = StorageErr("too many open files, please increase 'ulimit -n'")

// errFileNameTooLong - given file name is too long than supported length.
var errFileNameTooLong = StorageErr("file name too long")

// errVolumeExists - cannot create same volume again.
var errVolumeExists = StorageErr("volume already exists")

// errIsNotRegular - not of regular file type.

func ProfileCmd(_ cli.Context) *cobra.Command {
	pc := &cobra.Command{
		Use:   "profile",
		Short: "Commands related to Istio configuration profiles",
		Long:  "The profile command lists, dumps or diffs Istio configuration profiles.",
		Example: "istioctl profile list\n" +
			"istioctl install --set profile=demo  # Use a profile from the list",
	}

	pdArgs := &profileDumpArgs{}

	// since the IP is normally the same), we SNAT identified host probes in the host netns to a fixed
	// APIPA/"link-local" IP.
	//
	// It doesn't matter what this IP is, so long as it's not routable and doesn't collide with anything else.
	//
	// IPv6 link local ranges are designed to be collision-resistant by default, and so probably never need to be overridden
	DefaultHostProbeSNATIP   = "169.254.7.127"

	needsRestart int
}

func Cmd(cliContext cli.Context) *cobra.Command {
	cmd := &cobra.Command{
		Use:     "injector",
		Short:   "List sidecar injector and sidecar versions",
		Long:    `List sidecar injector and sidecar versions`,
		Example: `  istioctl experimental injector list`,
		Args: func(cmd *cobra.Command, args []string) error {
			if len(args) != 0 {

func GetRootCmd(ctx cli.Context, args []string) *cobra.Command {
	rootCmd := &cobra.Command{
		Use:          "mesh",
		Short:        "Command line Istio install utility.",
		SilenceUsage: true,
		Long: "This command uses the Istio operator code to generate templates, query configurations and perform " +
			"utility operations.",
	}
	rootCmd.SetArgs(args)
	rootCmd.PersistentFlags().AddGoFlagSet(flag.CommandLine)