159 lines
4.0 KiB
Go
159 lines
4.0 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 cgroup1
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import (
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"context"
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"path/filepath"
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"strings"
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"sync"
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systemdDbus "github.com/coreos/go-systemd/v22/dbus"
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"github.com/godbus/dbus/v5"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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const (
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SystemdDbus Name = "systemd"
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defaultSlice = "system.slice"
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)
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var (
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canDelegate bool
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once sync.Once
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)
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func Systemd() ([]Subsystem, error) {
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root, err := v1MountPoint()
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if err != nil {
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return nil, err
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}
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defaultSubsystems, err := defaults(root)
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if err != nil {
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return nil, err
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}
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s, err := NewSystemd(root)
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if err != nil {
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return nil, err
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}
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// make sure the systemd controller is added first
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return append([]Subsystem{s}, defaultSubsystems...), nil
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}
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func Slice(slice, name string) Path {
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if slice == "" {
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slice = defaultSlice
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}
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return func(subsystem Name) (string, error) {
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return filepath.Join(slice, name), nil
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}
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}
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func NewSystemd(root string) (*SystemdController, error) {
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return &SystemdController{
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root: root,
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}, nil
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}
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type SystemdController struct {
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mu sync.Mutex
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root string
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}
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func (s *SystemdController) Name() Name {
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return SystemdDbus
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}
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func (s *SystemdController) Create(path string, _ *specs.LinuxResources) error {
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ctx := context.TODO()
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conn, err := systemdDbus.NewWithContext(ctx)
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if err != nil {
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return err
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}
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defer conn.Close()
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slice, name := splitName(path)
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// We need to see if systemd can handle the delegate property
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// Systemd will return an error if it cannot handle delegate regardless
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// of its bool setting.
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checkDelegate := func() {
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canDelegate = true
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dlSlice := newProperty("Delegate", true)
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if _, err := conn.StartTransientUnitContext(ctx, slice, "testdelegate", []systemdDbus.Property{dlSlice}, nil); err != nil {
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if dbusError, ok := err.(dbus.Error); ok {
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// Starting with systemd v237, Delegate is not even a property of slices anymore,
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// so the D-Bus call fails with "InvalidArgs" error.
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if strings.Contains(dbusError.Name, "org.freedesktop.DBus.Error.PropertyReadOnly") || strings.Contains(dbusError.Name, "org.freedesktop.DBus.Error.InvalidArgs") {
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canDelegate = false
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}
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}
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}
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_, _ = conn.StopUnitContext(ctx, slice, "testDelegate", nil)
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}
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once.Do(checkDelegate)
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properties := []systemdDbus.Property{
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systemdDbus.PropDescription("cgroup " + name),
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systemdDbus.PropWants(slice),
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newProperty("DefaultDependencies", false),
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newProperty("MemoryAccounting", true),
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newProperty("CPUAccounting", true),
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newProperty("BlockIOAccounting", true),
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}
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// If we can delegate, we add the property back in
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if canDelegate {
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properties = append(properties, newProperty("Delegate", true))
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}
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ch := make(chan string)
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_, err = conn.StartTransientUnitContext(ctx, name, "replace", properties, ch)
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if err != nil {
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return err
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}
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<-ch
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return nil
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}
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func (s *SystemdController) Delete(path string) error {
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ctx := context.TODO()
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conn, err := systemdDbus.NewWithContext(ctx)
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if err != nil {
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return err
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}
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defer conn.Close()
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_, name := splitName(path)
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ch := make(chan string)
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_, err = conn.StopUnitContext(ctx, name, "replace", ch)
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if err != nil {
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return err
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}
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<-ch
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return nil
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}
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func newProperty(name string, units interface{}) systemdDbus.Property {
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return systemdDbus.Property{
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Name: name,
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Value: dbus.MakeVariant(units),
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}
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}
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func splitName(path string) (slice string, unit string) {
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slice, unit = filepath.Split(path)
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return strings.TrimSuffix(slice, "/"), unit
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}
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