kubectl源码分析之create rolebinding

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type RoleBindingOpts struct {//rolebinding结构体
  CreateSubcommandOptions *CreateSubcommandOptions
}

//创建rolebinding命令
func NewCmdCreateRoleBinding(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
  o := &RoleBindingOpts{//初始化结构体
    CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
  }

  cmd := &cobra.Command{//创建cobra命令
    Use:                   "rolebinding NAME --clusterrole=NAME|--role=NAME [--user=username] [--group=groupname] [--serviceaccount=namespace:serviceaccountname] [--dry-run]",
    DisableFlagsInUseLine: true,
    Short:                 i18n.T("Create a RoleBinding for a particular Role or ClusterRole"),
    Long:                  roleBindingLong,
    Example:               roleBindingExample,
    Run: func(cmd *cobra.Command, args []string) {
      cmdutil.CheckErr(o.Complete(f, cmd, args))//准备运行
      cmdutil.CheckErr(o.Run())//运行
    },
  }

  o.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)//设置print选项

  cmdutil.AddApplyAnnotationFlags(cmd)//设置save-config选项
  cmdutil.AddValidateFlags(cmd)//设置validate选项
  cmdutil.AddGeneratorFlags(cmd, generateversioned.RoleBindingV1GeneratorName)//设置generator选项
  cmd.Flags().String("clusterrole", "", i18n.T("ClusterRole this RoleBinding should reference"))//设置clusterrole选项
  cmd.Flags().String("role", "", i18n.T("Role this RoleBinding should reference"))//设置role选项
  cmd.Flags().StringArray("user", []string{}, "Usernames to bind to the role")//设置user选项
  cmd.Flags().StringArray("group", []string{}, "Groups to bind to the role")//设置group选项
  cmd.Flags().StringArray("serviceaccount", []string{}, "Service accounts to bind to the role, in the format <namespace>:<name>")//设置serviceaccount选项
  return cmd
}

//准备方法
func (o *RoleBindingOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
  name, err := NameFromCommandArgs(cmd, args)//获取名称
  if err != nil {
    return err
  }

  var generator generate.StructuredGenerator
  switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
  case generateversioned.RoleBindingV1GeneratorName://获取generator name并判断
    generator = &generateversioned.RoleBindingGeneratorV1{//构造generator对象
      Name:            name,
      ClusterRole:     cmdutil.GetFlagString(cmd, "clusterrole"),
      Role:            cmdutil.GetFlagString(cmd, "role"),
      Users:           cmdutil.GetFlagStringArray(cmd, "user"),
      Groups:          cmdutil.GetFlagStringArray(cmd, "group"),
      ServiceAccounts: cmdutil.GetFlagStringArray(cmd, "serviceaccount"),
    }
  default:
    return errUnsupportedGenerator(cmd, generatorName)
  }

  return o.CreateSubcommandOptions.Complete(f, cmd, args, generator)//运行createSubCommandOption的complete方法
}

// Run calls the CreateSubcommandOptions.Run in RoleBindingOpts instance
func (o *RoleBindingOpts) Run() error {//运行命令
  return o.CreateSubcommandOptions.Run()//运行createSubCommandOption的run方法
}