Adding utility for creating resource containers.

Allows creating and running in resource-only containers.

pkg/util/resource_container_linux.go

@@ -0,0 +1,41 @@
+// +build linux
+
+/*
+Copyright 2015 Google Inc. 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 util
+
+import (
+	"os"
+
+	"github.com/docker/libcontainer/cgroups/fs"
+	"github.com/docker/libcontainer/configs"
+)
+
+// Creates resource-only containerName if it does not already exist and moves
+// the current process to it.
+//
+// containerName must be an absolute container name.
+func RunInResourceContainer(containerName string) error {
+	manager := fs.Manager{
+		Cgroups: &configs.Cgroup{
+			Name:            containerName,
+			AllowAllDevices: true,
+		},
+	}
+
+	return manager.Apply(os.Getpid())
+}

pkg/util/resource_container_unsupported.go

@@ -0,0 +1,27 @@
+// +build !linux
+
+/*
+Copyright 2015 Google Inc. 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 util
+
+import (
+	"errors"
+)
+
+func RunInResourceContainer(containerName string) error {
+	return errors.New("resource-only containers unsupported in this platform")
+}