Add support for cgroupv2

Add support for cgroupv2 so it works with Docker Desktop 4.3 and newer.

Fixes #270

pkg/cluster/cluster.go

@@ -294,7 +294,13 @@ func (c *Cluster) createMachineRunArgs(machine *Machine, name string, i int) []s
 		"--tmpfs", "/run",
 		"--tmpfs", "/run/lock",
 		"--tmpfs", "/tmp:exec,mode=777",
-		"-v", "/sys/fs/cgroup:/sys/fs/cgroup:ro",
+	}
+	if docker.CgroupVersion() == "2" {
+		runArgs = append(runArgs, "--cgroupns", "host",
+			"-v", "/sys/fs/cgroup:/sys/fs/cgroup:rw")
+
+	} else {
+		runArgs = append(runArgs, "-v", "/sys/fs/cgroup:/sys/fs/cgroup:ro")
 	}
 
 	for _, volume := range machine.spec.Volumes {

pkg/docker/info.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2022 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 docker
+
+import (
+	"fmt"
+
+	"github.com/weaveworks/footloose/pkg/exec"
+)
+
+// Info return system-wide information
+func Info(format string) ([]string, error) {
+	cmd := exec.Command("docker", "info",
+		"-f", // format
+		fmt.Sprintf("%s", format),
+	)
+	return exec.CombinedOutputLines(cmd)
+}
+
+// InfoObject is similar to Inspect but deserializes the JSON output to a struct.
+func CgroupVersion() string {
+	res, err := Info("{{.CgroupVersion}}")
+	if err != nil || len(res) == 0 {
+		return ""
+	}
+	return res[0]
+}