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https://github.com/optim-enterprises-bv/kubernetes.git
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95 lines
2.9 KiB
Go
95 lines
2.9 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"path/filepath"
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libcontainerutils "k8s.io/kubernetes/third_party/forked/libcontainer/utils"
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libcontainercgroups "github.com/opencontainers/cgroups"
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)
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const (
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// CgroupRoot is the base path where cgroups are mounted
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CgroupRoot = "/sys/fs/cgroup"
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)
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// GetPids gets pids of the desired cgroup
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// Forked from opencontainers/runc/libcontainer/cgroup/fs.Manager.GetPids()
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func GetPids(cgroupPath string) ([]int, error) {
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dir := ""
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if libcontainercgroups.IsCgroup2UnifiedMode() {
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path, err := filepath.Rel("/", cgroupPath)
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if err != nil {
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return nil, err
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}
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dir = filepath.Join(CgroupRoot, path)
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} else {
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var err error
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dir, err = getCgroupV1Path(cgroupPath)
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if err != nil {
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return nil, err
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}
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}
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return libcontainercgroups.GetPids(dir)
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}
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// getCgroupV1Path gets the file path to the "devices" subsystem of the desired cgroup.
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// cgroupPath is the path in the cgroup hierarchy.
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func getCgroupV1Path(cgroupPath string) (string, error) {
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cgroupPath = libcontainerutils.CleanPath(cgroupPath)
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mnt, root, err := libcontainercgroups.FindCgroupMountpointAndRoot(cgroupPath, "devices")
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// If we didn't mount the subsystem, there is no point we make the path.
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if err != nil {
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return "", err
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}
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// If the cgroup name/path is absolute do not look relative to the cgroup of the init process.
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if filepath.IsAbs(cgroupPath) {
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// Sometimes subsystems can be mounted together as 'cpu,cpuacct'.
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return filepath.Join(root, mnt, cgroupPath), nil
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}
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parentPath, err := getCgroupV1ParentPath(mnt, root)
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if err != nil {
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return "", err
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}
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return filepath.Join(parentPath, cgroupPath), nil
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}
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// getCgroupV1ParentPath gets the parent filepath to this cgroup, for resolving relative cgroup paths.
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func getCgroupV1ParentPath(mountpoint, root string) (string, error) {
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// Use GetThisCgroupDir instead of GetInitCgroupDir, because the creating
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// process could in container and shared pid namespace with host, and
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// /proc/1/cgroup could point to whole other world of cgroups.
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initPath, err := libcontainercgroups.GetOwnCgroup("devices")
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if err != nil {
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return "", err
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}
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// This is needed for nested containers, because in /proc/self/cgroup we
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// see paths from host, which don't exist in container.
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relDir, err := filepath.Rel(root, initPath)
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if err != nil {
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return "", err
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}
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return filepath.Join(mountpoint, relDir), nil
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}
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