Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/k8s.io/apimachinery/pkg/types/nodename.go b/vendor/k8s.io/apimachinery/pkg/types/nodename.go
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+/*
+Copyright 2015 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 types
+
+// NodeName is a type that holds a api.Node's Name identifier.
+// Being a type captures intent and helps make sure that the node name
+// is not confused with similar concepts (the hostname, the cloud provider id,
+// the cloud provider name etc)
+//
+// To clarify the various types:
+//
+// * Node.Name is the Name field of the Node in the API. This should be stored in a NodeName.
+// Unfortunately, because Name is part of ObjectMeta, we can't store it as a NodeName at the API level.
+//
+// * Hostname is the hostname of the local machine (from uname -n).
+// However, some components allow the user to pass in a --hostname-override flag,
+// which will override this in most places. In the absence of anything more meaningful,
+// kubelet will use Hostname as the Node.Name when it creates the Node.
+//
+// * The cloudproviders have the own names: GCE has InstanceName, AWS has InstanceId.
+//
+// For GCE, InstanceName is the Name of an Instance object in the GCE API. On GCE, Instance.Name becomes the
+// Hostname, and thus it makes sense also to use it as the Node.Name. But that is GCE specific, and it is up
+// to the cloudprovider how to do this mapping.
+//
+// For AWS, the InstanceID is not yet suitable for use as a Node.Name, so we actually use the
+// PrivateDnsName for the Node.Name. And this is _not_ always the same as the hostname: if
+// we are using a custom DHCP domain it won't be.
+type NodeName string