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cmd.go
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cmd.go
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package util
import (
"errors"
"fmt"
"io"
"path/filepath"
"regexp"
"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")
var commaSepVarsPattern = regexp.MustCompile(".*=.*,.*=.*")
// ReplaceCommandName recursively processes the examples in a given command to change a hardcoded
// command name (like 'kubectl' to the appropriate target name). It returns c.
func ReplaceCommandName(from, to string, c *cobra.Command) *cobra.Command {
c.Example = strings.Replace(c.Example, from, to, -1)
for _, sub := range c.Commands() {
ReplaceCommandName(from, to, sub)
}
return c
}
// 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 unversioned.GroupResource, resourceString string, mapper meta.RESTMapper) (unversioned.GroupResource, string, error) {
if mapper == nil {
return unversioned.GroupResource{}, "", errors.New("mapper cannot be nil")
}
var name string
parts := strings.Split(resourceString, "/")
switch len(parts) {
case 1:
name = parts[0]
case 2:
name = parts[1]
// Allow specifying the group the same way kubectl does, as "resource.group.name"
groupResource := unversioned.ParseGroupResource(parts[0])
// normalize resource case
groupResource.Resource = strings.ToLower(groupResource.Resource)
gvr, err := mapper.ResourceFor(groupResource.WithVersion(""))
if err != nil {
return unversioned.GroupResource{}, "", err
}
return gvr.GroupResource(), name, nil
default:
return unversioned.GroupResource{}, "", 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.Empty() {
actualOutputVersion = externalVersion
}
}
convertedObject, err := kapi.Scheme.ConvertToVersion(obj, actualOutputVersion)
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
// TODO: move this function into the core factory PrintObjects method
// TODO: print-objects should have preferred output versions
func convertItemsForDisplayFromDefaultCommand(cmd *cobra.Command, objs []runtime.Object) ([]runtime.Object, error) {
requested := kcmdutil.GetFlagString(cmd, "output-version")
version, err := unversioned.ParseGroupVersion(requested)
if err != nil {
return nil, err
}
return convertItemsForDisplay(objs, version)
}
// VersionedPrintObject handles printing an object in the appropriate version by looking at 'output-version'
// on the command
func VersionedPrintObject(fn func(*cobra.Command, meta.RESTMapper, runtime.Object, io.Writer) error, c *cobra.Command, mapper meta.RESTMapper, out io.Writer) func(runtime.Object) error {
return func(obj runtime.Object) error {
// TODO: fold into the core printer functionality (preferred output version)
if list, ok := obj.(*kapi.List); ok {
var err error
if list.Items, err = convertItemsForDisplayFromDefaultCommand(c, list.Items); err != nil {
return err
}
} else {
result, err := convertItemsForDisplayFromDefaultCommand(c, []runtime.Object{obj})
if err != nil {
return err
}
obj = result[0]
}
return fn(c, mapper, obj, out)
}
}
func WarnAboutCommaSeparation(errout io.Writer, values []string, flag string) {
for _, value := range values {
if commaSepVarsPattern.MatchString(value) {
fmt.Fprintf(errout, "warning: %s no longer accepts comma-separated lists of values. %q will be treated as a single key-value pair.\n", flag, value)
}
}
}