kubectl源码分析之create deployment

type DeploymentOpts struct {//option结构体
  CreateSubcommandOptions *CreateSubcommandOptions
}

//创建create deployment命令
func NewCmdCreateDeployment(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
  options := &DeploymentOpts{//初始化结构体
    CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
  }

  cmd := &cobra.Command{//创建cobra命令
    Use:                   "deployment NAME --image=image [--dry-run]",
    DisableFlagsInUseLine: true,
    Aliases:               []string{"deploy"},
    Short:                 i18n.T("Create a deployment with the specified name."),
    Long:                  deploymentLong,
    Example:               deploymentExample,
    Run: func(cmd *cobra.Command, args []string) {
      cmdutil.CheckErr(options.Complete(f, cmd, args))//准备运行
      cmdutil.CheckErr(options.Run())//运行命令
    },
  }

  options.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, "")//设置generator选项
  cmd.Flags().StringSlice("image", []string{}, "Image name to run.")//设置image选项
  cmd.MarkFlagRequired("image")//必须
  return cmd
}

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

  clientset, err := f.KubernetesClientSet()//获取clientset
  if err != nil {
    return err
  }

  generatorName := cmdutil.GetFlagString(cmd, "generator")//后去generator 名称

  if len(generatorName) == 0 {//如果generator名称为空
    generatorName = generateversioned.DeploymentBasicAppsV1GeneratorName//设置默认的generator名称
    generatorNameTemp, err := generateversioned.FallbackGeneratorNameIfNecessary(generatorName, clientset.Discovery(), o.CreateSubcommandOptions.ErrOut)//回退generator，如果有必要
    if err != nil {
      return err
    }
    if generatorNameTemp != generatorName {如果generator不相同则发警告
      cmdutil.Warning(o.CreateSubcommandOptions.ErrOut, generatorName, generatorNameTemp)
    } else {
      generatorName = generatorNameTemp
    }
  }

  imageNames := cmdutil.GetFlagStringSlice(cmd, "image")//获取image选项
  generator, ok := generatorFromName(generatorName, imageNames, name)//根据generator名称生成generator
  if !ok {
    return errUnsupportedGenerator(cmd, generatorName)
  }

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

func generatorFromName(
  generatorName string,
  imageNames []string,
  deploymentName string,
) (generate.StructuredGenerator, bool) {

  switch generatorName {//判断generator名称生成相应generator
  case generateversioned.DeploymentBasicAppsV1GeneratorName:
    generator := &generateversioned.DeploymentBasicAppsGeneratorV1{
      BaseDeploymentGenerator: generateversioned.BaseDeploymentGenerator{
        Name:   deploymentName,
        Images: imageNames,
      },
    }
    return generator, true

  case generateversioned.DeploymentBasicAppsV1Beta1GeneratorName:
    generator := &generateversioned.DeploymentBasicAppsGeneratorV1Beta1{
      BaseDeploymentGenerator: generateversioned.BaseDeploymentGenerator{
        Name:   deploymentName,
        Images: imageNames,
      },
    }
    return generator, true

  case generateversioned.DeploymentBasicV1Beta1GeneratorName:
    generator := &generateversioned.DeploymentBasicGeneratorV1{
      BaseDeploymentGenerator: generateversioned.BaseDeploymentGenerator{
        Name:   deploymentName,
        Images: imageNames,
      },
    }
    return generator, true
  }

  return nil, false
}