remove unused rest/versions.go

staging/src/k8s.io/client-go/rest/versions.go

-/*
-Copyright 2014 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package rest
-
-import (
-	"encoding/json"
-	"fmt"
-	"net/http"
-	"path"
-
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-)
-
-const (
-	legacyAPIPath  = "/api"
-	defaultAPIPath = "/apis"
-)
-
-// TODO: Is this obsoleted by the discovery client?
-
-// ServerAPIVersions returns the GroupVersions supported by the API server.
-// It creates a RESTClient based on the passed in config, but it doesn't rely
-// on the Version and Codec of the config, because it uses AbsPath and
-// takes the raw response.
-func ServerAPIVersions(c *Config) (groupVersions []string, err error) {
-	transport, err := TransportFor(c)
-	if err != nil {
-		return nil, err
-	}
-	client := http.Client{Transport: transport}
-
-	configCopy := *c
-	configCopy.GroupVersion = nil
-	configCopy.APIPath = ""
-	baseURL, _, err := defaultServerUrlFor(&configCopy)
-	if err != nil {
-		return nil, err
-	}
-	// Get the groupVersions exposed at /api
-	originalPath := baseURL.Path
-	baseURL.Path = path.Join(originalPath, legacyAPIPath)
-	resp, err := client.Get(baseURL.String())
-	if err != nil {
-		return nil, err
-	}
-	var v metav1.APIVersions
-	defer resp.Body.Close()
-	err = json.NewDecoder(resp.Body).Decode(&v)
-	if err != nil {
-		return nil, fmt.Errorf("unexpected error: %v", err)
-	}
-
-	groupVersions = append(groupVersions, v.Versions...)
-	// Get the groupVersions exposed at /apis
-	baseURL.Path = path.Join(originalPath, defaultAPIPath)
-	resp2, err := client.Get(baseURL.String())
-	if err != nil {
-		return nil, err
-	}
-	var apiGroupList metav1.APIGroupList
-	defer resp2.Body.Close()
-	err = json.NewDecoder(resp2.Body).Decode(&apiGroupList)
-	if err != nil {
-		return nil, fmt.Errorf("unexpected error: %v", err)
-	}
-
-	for _, g := range apiGroupList.Groups {
-		for _, gv := range g.Versions {
-			groupVersions = append(groupVersions, gv.GroupVersion)
-		}
-	}
-
-	return groupVersions, nil
-}