Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/k8s.io/client-go/discovery/helper.go b/vendor/k8s.io/client-go/discovery/helper.go
new file mode 100644
index 0000000..3bfe514
--- /dev/null
+++ b/vendor/k8s.io/client-go/discovery/helper.go
@@ -0,0 +1,125 @@
+/*
+Copyright 2016 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 discovery
+
+import (
+ "fmt"
+
+ metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+ "k8s.io/apimachinery/pkg/runtime/schema"
+ "k8s.io/apimachinery/pkg/util/sets"
+ apimachineryversion "k8s.io/apimachinery/pkg/version"
+)
+
+// MatchesServerVersion queries the server to compares the build version
+// (git hash) of the client with the server's build version. It returns an error
+// if it failed to contact the server or if the versions are not an exact match.
+func MatchesServerVersion(clientVersion apimachineryversion.Info, client DiscoveryInterface) error {
+ sVer, err := client.ServerVersion()
+ if err != nil {
+ return fmt.Errorf("couldn't read version from server: %v", err)
+ }
+ // GitVersion includes GitCommit and GitTreeState, but best to be safe?
+ if clientVersion.GitVersion != sVer.GitVersion || clientVersion.GitCommit != sVer.GitCommit || clientVersion.GitTreeState != sVer.GitTreeState {
+ return fmt.Errorf("server version (%#v) differs from client version (%#v)", sVer, clientVersion)
+ }
+
+ return nil
+}
+
+// ServerSupportsVersion returns an error if the server doesn't have the required version
+func ServerSupportsVersion(client DiscoveryInterface, requiredGV schema.GroupVersion) error {
+ groups, err := client.ServerGroups()
+ if err != nil {
+ // This is almost always a connection error, and higher level code should treat this as a generic error,
+ // not a negotiation specific error.
+ return err
+ }
+ versions := metav1.ExtractGroupVersions(groups)
+ serverVersions := sets.String{}
+ for _, v := range versions {
+ serverVersions.Insert(v)
+ }
+
+ if serverVersions.Has(requiredGV.String()) {
+ return nil
+ }
+
+ // If the server supports no versions, then we should pretend it has the version because of old servers.
+ // This can happen because discovery fails due to 403 Forbidden errors
+ if len(serverVersions) == 0 {
+ return nil
+ }
+
+ return fmt.Errorf("server does not support API version %q", requiredGV)
+}
+
+// GroupVersionResources converts APIResourceLists to the GroupVersionResources.
+func GroupVersionResources(rls []*metav1.APIResourceList) (map[schema.GroupVersionResource]struct{}, error) {
+ gvrs := map[schema.GroupVersionResource]struct{}{}
+ for _, rl := range rls {
+ gv, err := schema.ParseGroupVersion(rl.GroupVersion)
+ if err != nil {
+ return nil, err
+ }
+ for i := range rl.APIResources {
+ gvrs[schema.GroupVersionResource{Group: gv.Group, Version: gv.Version, Resource: rl.APIResources[i].Name}] = struct{}{}
+ }
+ }
+ return gvrs, nil
+}
+
+// FilteredBy filters by the given predicate. Empty APIResourceLists are dropped.
+func FilteredBy(pred ResourcePredicate, rls []*metav1.APIResourceList) []*metav1.APIResourceList {
+ result := []*metav1.APIResourceList{}
+ for _, rl := range rls {
+ filtered := *rl
+ filtered.APIResources = nil
+ for i := range rl.APIResources {
+ if pred.Match(rl.GroupVersion, &rl.APIResources[i]) {
+ filtered.APIResources = append(filtered.APIResources, rl.APIResources[i])
+ }
+ }
+ if filtered.APIResources != nil {
+ result = append(result, &filtered)
+ }
+ }
+ return result
+}
+
+// ResourcePredicate has a method to check if a resource matches a given condition.
+type ResourcePredicate interface {
+ Match(groupVersion string, r *metav1.APIResource) bool
+}
+
+// ResourcePredicateFunc returns true if it matches a resource based on a custom condition.
+type ResourcePredicateFunc func(groupVersion string, r *metav1.APIResource) bool
+
+// Match is a wrapper around ResourcePredicateFunc.
+func (fn ResourcePredicateFunc) Match(groupVersion string, r *metav1.APIResource) bool {
+ return fn(groupVersion, r)
+}
+
+// SupportsAllVerbs is a predicate matching a resource iff all given verbs are supported.
+type SupportsAllVerbs struct {
+ Verbs []string
+}
+
+// Match checks if a resource contains all the given verbs.
+func (p SupportsAllVerbs) Match(groupVersion string, r *metav1.APIResource) bool {
+ return sets.NewString([]string(r.Verbs)...).HasAll(p.Verbs...)
+}