Update to latest cadvisor - cleanup mesos/rkt

Change-Id: Ib5ae0cb13b93f8c87bb74e3ba33040df5f3d6a6f

vendor/github.com/google/cadvisor/container/docker/plugin.go

@@ -0,0 +1,77 @@
+// Copyright 2019 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 docker
+
+import (
+	"time"
+
+	"github.com/google/cadvisor/container"
+	"github.com/google/cadvisor/fs"
+	info "github.com/google/cadvisor/info/v1"
+	"github.com/google/cadvisor/watcher"
+	"golang.org/x/net/context"
+	"k8s.io/klog"
+)
+
+const dockerClientTimeout = 10 * time.Second
+
+// NewPlugin returns an implementation of container.Plugin suitable for passing to container.RegisterPlugin()
+func NewPlugin() container.Plugin {
+	return &plugin{}
+}
+
+type plugin struct{}
+
+func (p *plugin) InitializeFSContext(context *fs.Context) error {
+	SetTimeout(dockerClientTimeout)
+	// Try to connect to docker indefinitely on startup.
+	dockerStatus := retryDockerStatus()
+	context.Docker = fs.DockerContext{
+		Root:         RootDir(),
+		Driver:       dockerStatus.Driver,
+		DriverStatus: dockerStatus.DriverStatus,
+	}
+	return nil
+}
+
+func (p *plugin) Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics container.MetricSet) (watcher.ContainerWatcher, error) {
+	err := Register(factory, fsInfo, includedMetrics)
+	return nil, err
+}
+
+func retryDockerStatus() info.DockerStatus {
+	startupTimeout := dockerClientTimeout
+	maxTimeout := 4 * startupTimeout
+	for {
+		ctx, _ := context.WithTimeout(context.Background(), startupTimeout)
+		dockerStatus, err := StatusWithContext(ctx)
+		if err == nil {
+			return dockerStatus
+		}
+
+		switch err {
+		case context.DeadlineExceeded:
+			klog.Warningf("Timeout trying to communicate with docker during initialization, will retry")
+		default:
+			klog.V(5).Infof("Docker not connected: %v", err)
+			return info.DockerStatus{}
+		}
+
+		startupTimeout = 2 * startupTimeout
+		if startupTimeout > maxTimeout {
+			startupTimeout = maxTimeout
+		}
+	}
+}