ed47d6ba76
The rpc only reports one field, i.e. the cgroup driver, to kubelet. Containerd determines the effective cgroup driver by looking at all runtime handlers, starting from the default runtime handler (the rest in alphabetical order), and returning the cgroup driver setting of the first runtime handler that supports one. If no runtime handler supports cgroup driver (i.e. has a config option for it) containerd falls back to auto-detection, returning systemd if systemd is running and cgroupfs otherwise. This patch implements the CRI server side of Kubernetes KEP-4033: https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/4033-group-driver-detection-over-cri Signed-off-by: Markus Lehtonen <markus.lehtonen@intel.com>
100 lines
2.7 KiB
Go
100 lines
2.7 KiB
Go
/*
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Copyright The containerd 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 fs2
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"github.com/opencontainers/runc/libcontainer/configs"
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"github.com/opencontainers/runc/libcontainer/utils"
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)
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const UnifiedMountpoint = "/sys/fs/cgroup"
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func defaultDirPath(c *configs.Cgroup) (string, error) {
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if (c.Name != "" || c.Parent != "") && c.Path != "" {
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return "", fmt.Errorf("cgroup: either Path or Name and Parent should be used, got %+v", c)
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}
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return _defaultDirPath(UnifiedMountpoint, c.Path, c.Parent, c.Name)
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}
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func _defaultDirPath(root, cgPath, cgParent, cgName string) (string, error) {
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if (cgName != "" || cgParent != "") && cgPath != "" {
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return "", errors.New("cgroup: either Path or Name and Parent should be used")
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}
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// XXX: Do not remove CleanPath. Path safety is important! -- cyphar
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innerPath := utils.CleanPath(cgPath)
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if innerPath == "" {
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cgParent := utils.CleanPath(cgParent)
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cgName := utils.CleanPath(cgName)
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innerPath = filepath.Join(cgParent, cgName)
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}
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if filepath.IsAbs(innerPath) {
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return filepath.Join(root, innerPath), nil
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}
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ownCgroup, err := parseCgroupFile("/proc/self/cgroup")
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if err != nil {
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return "", err
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}
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// The current user scope most probably has tasks in it already,
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// making it impossible to enable controllers for its sub-cgroup.
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// A parent cgroup (with no tasks in it) is what we need.
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ownCgroup = filepath.Dir(ownCgroup)
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return filepath.Join(root, ownCgroup, innerPath), nil
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}
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// parseCgroupFile parses /proc/PID/cgroup file and return string
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func parseCgroupFile(path string) (string, error) {
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f, err := os.Open(path)
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if err != nil {
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return "", err
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}
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defer f.Close()
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return parseCgroupFromReader(f)
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}
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func parseCgroupFromReader(r io.Reader) (string, error) {
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s := bufio.NewScanner(r)
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for s.Scan() {
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var (
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text = s.Text()
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parts = strings.SplitN(text, ":", 3)
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)
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if len(parts) < 3 {
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return "", fmt.Errorf("invalid cgroup entry: %q", text)
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}
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// text is like "0::/user.slice/user-1001.slice/session-1.scope"
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if parts[0] == "0" && parts[1] == "" {
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return parts[2], nil
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}
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}
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if err := s.Err(); err != nil {
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return "", err
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}
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return "", errors.New("cgroup path not found")
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}
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