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detect_linux.go
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detect_linux.go
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//go:build linux
/*
Copyright 2022 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 detect
import (
"runtime"
"golang.org/x/sys/unix"
)
// cgroupVersion returns cgroup version as set on the linux OS host machine (where minikube runs).
// Possible options are: "v1", "v2" or "" (unknown).
// ref: https://kubernetes.io/docs/concepts/architecture/cgroups/#check-cgroup-version
// ref: https://man7.org/linux/man-pages/man7/cgroups.7.html
func cgroupVersion() string {
if runtime.GOOS != "linux" {
return ""
}
// check '/sys/fs/cgroup' or '/sys/fs/cgroup/unified' type
var stat unix.Statfs_t
if err := unix.Statfs("/sys/fs/cgroup", &stat); err != nil {
return ""
}
// fallback, but could be misleading
if stat.Type != unix.TMPFS_MAGIC && stat.Type != unix.CGROUP_SUPER_MAGIC && stat.Type != unix.CGROUP2_SUPER_MAGIC {
if err := unix.Statfs("/sys/fs/cgroup/unified", &stat); err != nil {
return ""
}
}
switch stat.Type {
case unix.TMPFS_MAGIC, unix.CGROUP_SUPER_MAGIC: // tmpfs, cgroupfs
return "v1"
case unix.CGROUP2_SUPER_MAGIC: // cgroup2fs
return "v2"
default:
return ""
}
}