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Merge pull request #48572 from alexandercampbell/kubectl-follow-options-pattern-in-version

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Automatic merge from submit-queue

cmd/version: refactor to use the -Options pattern

Refactor `kubectl version` to use the prescribed pattern in [kubectl-conventions.md](49d65710b3/contributors/devel/kubectl-conventions.md (command-implementation-conventions)).

```release-note
NONE
```

/assign @mengqiy
This commit is contained in:
Kubernetes Submit Queue 2017-07-14 10:49:11 -07:00 committed by GitHub
commit fd619b04b2
1 changed files with 77 additions and 52 deletions
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129
pkg/kubectl/cmd/version.go
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@ -37,6 +37,14 @@ type Version struct {
ServerVersion *apimachineryversion.Info `json:"serverVersion,omitempty" yaml:"serverVersion,omitempty"`
}
// VersionOptions: describe the options available to users of the "kubectl
// version" command.
type VersionOptions struct {
clientOnly bool
short bool
output string
}
var (
versionExample = templates.Examples(i18n.T(`
# Print the client and server versions for the current context
@ -50,66 +58,19 @@ func NewCmdVersion(f cmdutil.Factory, out io.Writer) *cobra.Command {
Long: "Print the client and server version information for the current context",
Example: versionExample,
Run: func(cmd *cobra.Command, args []string) {
err := RunVersion(f, out, cmd)
cmdutil.CheckErr(err)
options := new(VersionOptions)
cmdutil.CheckErr(options.Complete(cmd))
cmdutil.CheckErr(options.Validate())
cmdutil.CheckErr(options.Run(f, out))
},
}
cmd.Flags().BoolP("client", "c", false, "Client version only (no server required).")
cmd.Flags().BoolP("short", "", false, "Print just the version number.")
cmd.Flags().String("output", "", "output format, options available are yaml and json")
cmd.Flags().String("output", "", "one of 'yaml' or 'json'")
cmd.Flags().MarkShorthandDeprecated("client", "please use --client instead.")
return cmd
}
func RunVersion(f cmdutil.Factory, out io.Writer, cmd *cobra.Command) error {
var serverVersion *apimachineryversion.Info = nil
var serverErr error = nil
vo := Version{nil, nil}
clientVersion := version.Get()
vo.ClientVersion = &clientVersion
if !cmdutil.GetFlagBool(cmd, "client") {
serverVersion, serverErr = retrieveServerVersion(f)
vo.ServerVersion = serverVersion
}
switch of := cmdutil.GetFlagString(cmd, "output"); of {
case "":
if cmdutil.GetFlagBool(cmd, "short") {
fmt.Fprintf(out, "Client Version: %s\n", clientVersion.GitVersion)
if serverVersion != nil {
fmt.Fprintf(out, "Server Version: %s\n", serverVersion.GitVersion)
}
} else {
fmt.Fprintf(out, "Client Version: %s\n", fmt.Sprintf("%#v", clientVersion))
if serverVersion != nil {
fmt.Fprintf(out, "Server Version: %s\n", fmt.Sprintf("%#v", *serverVersion))
}
}
case "yaml":
y, err := yaml.Marshal(&vo)
if err != nil {
return err
}
fmt.Fprintln(out, string(y))
case "json":
y, err := json.Marshal(&vo)
if err != nil {
return err
}
fmt.Fprintln(out, string(y))
default:
return errors.New("invalid output format: " + of)
}
return serverErr
}
func retrieveServerVersion(f cmdutil.Factory) (*apimachineryversion.Info, error) {
discoveryClient, err := f.DiscoveryClient()
if err != nil {
@ -120,3 +81,67 @@ func retrieveServerVersion(f cmdutil.Factory) (*apimachineryversion.Info, error)
discoveryClient.Invalidate()
return discoveryClient.ServerVersion()
}
func (o *VersionOptions) Run(f cmdutil.Factory, out io.Writer) error {
var (
serverVersion *apimachineryversion.Info
serverErr error
versionInfo Version
)
clientVersion := version.Get()
versionInfo.ClientVersion = &clientVersion
if !o.clientOnly {
serverVersion, serverErr = retrieveServerVersion(f)
versionInfo.ServerVersion = serverVersion
}
switch o.output {
case "":
if o.short {
fmt.Fprintf(out, "Client Version: %s\n", clientVersion.GitVersion)
if serverVersion != nil {
fmt.Fprintf(out, "Server Version: %s\n", serverVersion.GitVersion)
}
} else {
fmt.Fprintf(out, "Client Version: %s\n", fmt.Sprintf("%#v", clientVersion))
if serverVersion != nil {
fmt.Fprintf(out, "Server Version: %s\n", fmt.Sprintf("%#v", *serverVersion))
}
}
case "yaml":
marshalled, err := yaml.Marshal(&versionInfo)
if err != nil {
return err
}
fmt.Fprintln(out, string(marshalled))
case "json":
marshalled, err := json.Marshal(&versionInfo)
if err != nil {
return err
}
fmt.Fprintln(out, string(marshalled))
default:
// There is a bug in the program if we hit this case.
// However, we follow a policy of never panicking.
return fmt.Errorf("VersionOptions were not validated: --output=%q should have been rejected", o.output)
}
return serverErr
}
func (o *VersionOptions) Complete(cmd *cobra.Command) error {
o.clientOnly = cmdutil.GetFlagBool(cmd, "client")
o.short = cmdutil.GetFlagBool(cmd, "short")
o.output = cmdutil.GetFlagString(cmd, "output")
return nil
}
func (o *VersionOptions) Validate() error {
if o.output != "" && o.output != "yaml" && o.output != "json" {
return errors.New(`--output must be 'yaml' or 'json'`)
}
return nil
}