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cmd.go
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cmd.go
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package util
import (
"errors"
"fmt"
"io"
"path/filepath"
"strings"
"github.com/spf13/cobra"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/meta"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/apimachinery/registered"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/runtime"
)
// ErrExit is a marker interface for cli commands indicating that the response has been processed
var ErrExit = fmt.Errorf("exit directly")
func DefaultSubCommandRun(out io.Writer) func(c *cobra.Command, args []string) {
return func(c *cobra.Command, args []string) {
c.SetOutput(out)
if len(args) > 0 {
kcmdutil.CheckErr(kcmdutil.UsageError(c, fmt.Sprintf(`unknown command "%s"`, strings.Join(args, " "))))
}
c.Help()
}
}
// GetDisplayFilename returns the absolute path of the filename as long as there was no error, otherwise it returns the filename as-is
func GetDisplayFilename(filename string) string {
if absName, err := filepath.Abs(filename); err == nil {
return absName
}
return filename
}
// ResolveResource returns the resource type and name of the resourceString.
// If the resource string has no specified type, defaultResource will be returned.
func ResolveResource(defaultResource, resourceString string, mapper meta.RESTMapper) (string, string, error) {
if mapper == nil {
return "", "", errors.New("mapper cannot be nil")
}
var name string
parts := strings.Split(resourceString, "/")
switch len(parts) {
case 1:
name = parts[0]
case 2:
partialResource := unversioned.GroupVersionResource{Resource: parts[0]}
gvrs, err := mapper.ResourcesFor(partialResource)
if err != nil {
return "", "", err
}
if len(gvrs) == 0 {
return gvrs[0].Resource, parts[1], nil
}
groupResource := gvrs[0].GroupResource()
for _, gvr := range gvrs[1:] {
if groupResource != gvr.GroupResource() {
return "", "", &meta.AmbiguousResourceError{PartialResource: partialResource, MatchingResources: gvrs}
}
}
return gvrs[0].Resource, parts[1], nil
default:
return "", "", fmt.Errorf("invalid resource format: %s", resourceString)
}
return defaultResource, name, nil
}
// ConvertItemsForDisplay returns a new list that contains parallel elements that have been converted to the most preferred external version
func ConvertItemsForDisplay(objs []runtime.Object, preferredVersions ...unversioned.GroupVersion) ([]runtime.Object, error) {
ret := []runtime.Object{}
for i := range objs {
obj := objs[i]
kind, err := kapi.Scheme.ObjectKind(obj)
if err != nil {
return nil, err
}
groupMeta, err := registered.Group(kind.Group)
if err != nil {
return nil, err
}
requestedVersion := unversioned.GroupVersion{}
for _, preferredVersion := range preferredVersions {
if preferredVersion.Group == kind.Group {
requestedVersion = preferredVersion
break
}
}
actualOutputVersion := unversioned.GroupVersion{}
for _, externalVersion := range groupMeta.GroupVersions {
if externalVersion == requestedVersion {
actualOutputVersion = externalVersion
break
}
if actualOutputVersion.IsEmpty() {
actualOutputVersion = externalVersion
}
}
convertedObject, err := kapi.Scheme.ConvertToVersion(obj, actualOutputVersion.String())
if err != nil {
return nil, err
}
ret = append(ret, convertedObject)
}
return ret, nil
}
// ConvertItemsForDisplayFromDefaultCommand returns a new list that contains parallel elements that have been converted to the most preferred external version
func ConvertItemsForDisplayFromDefaultCommand(cmd *cobra.Command, objs []runtime.Object) ([]runtime.Object, error) {
requestedOutputVersionString := kcmdutil.GetFlagString(cmd, "output-version")
requestedOutputVersion, err := unversioned.ParseGroupVersion(requestedOutputVersionString)
if err != nil {
return nil, err
}
return ConvertItemsForDisplay(objs, requestedOutputVersion)
}