Make emptyDir volumes work for non-root UIDs

pkg/volume/empty_dir/chcon_runner_linux.go

@@ -0,0 +1,34 @@
+// +build linux
+
+/*
+Copyright 2014 The Kubernetes Authors All rights reserved.
+
+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 empty_dir
+
+import (
+	"github.com/docker/libcontainer/selinux"
+)
+
+type realChconRunner struct{}
+
+func (_ *realChconRunner) SetContext(dir, context string) error {
+	// If SELinux is not enabled, return an empty string
+	if !selinux.SelinuxEnabled() {
+		return nil
+	}
+
+	return selinux.Setfilecon(dir, context)
+}