func checkSeal(cmd *seal.Command, c *gcli.Context) error {
cmd.Format = c.String(formatFlag)
if len(cmd.Format) > 0 {
valid := false
for _, name := range codec.Names() {
if name == cmd.Format {
valid = true
break
}
}
if !valid {
return fmt.Errorf("Invalid seal format '%s', must be one of %s", cmd.Format, strings.Join(codec.Names(), ", "))
}
}
if err := cli.CheckCommonFlagsAndInit(cmd, c); err != nil {
return err
}
return nil
}
