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- package cgroups
- import (
- "fmt"
- "path/filepath"
- "strings"
- "sync"
- systemdDbus "github.com/coreos/go-systemd/dbus"
- "github.com/godbus/dbus"
- specs "github.com/opencontainers/runtime-spec/specs-go"
- )
- const (
- SystemdDbus Name = "systemd"
- defaultSlice = "system.slice"
- )
- func Systemd() ([]Subsystem, error) {
- root, err := v1MountPoint()
- if err != nil {
- return nil, err
- }
- defaultSubsystems, err := defaults(root)
- if err != nil {
- return nil, err
- }
- s, err := NewSystemd(root)
- if err != nil {
- return nil, err
- }
- // make sure the systemd controller is added first
- return append([]Subsystem{s}, defaultSubsystems...), nil
- }
- func Slice(slice, name string) Path {
- if slice == "" {
- slice = defaultSlice
- }
- return func(subsystem Name) (string, error) {
- return filepath.Join(slice, unitName(name)), nil
- }
- }
- func NewSystemd(root string) (*SystemdController, error) {
- return &SystemdController{
- root: root,
- }, nil
- }
- type SystemdController struct {
- mu sync.Mutex
- root string
- }
- func (s *SystemdController) Name() Name {
- return SystemdDbus
- }
- func (s *SystemdController) Create(path string, resources *specs.LinuxResources) error {
- conn, err := systemdDbus.New()
- if err != nil {
- return err
- }
- defer conn.Close()
- slice, name := splitName(path)
- properties := []systemdDbus.Property{
- systemdDbus.PropDescription(fmt.Sprintf("cgroup %s", name)),
- systemdDbus.PropWants(slice),
- newProperty("DefaultDependencies", false),
- newProperty("Delegate", true),
- newProperty("MemoryAccounting", true),
- newProperty("CPUAccounting", true),
- newProperty("BlockIOAccounting", true),
- }
- ch := make(chan string)
- _, err = conn.StartTransientUnit(name, "replace", properties, ch)
- if err != nil {
- return err
- }
- <-ch
- return nil
- }
- func (s *SystemdController) Delete(path string) error {
- conn, err := systemdDbus.New()
- if err != nil {
- return err
- }
- defer conn.Close()
- _, name := splitName(path)
- ch := make(chan string)
- _, err = conn.StopUnit(name, "replace", ch)
- if err != nil {
- return err
- }
- <-ch
- return nil
- }
- func newProperty(name string, units interface{}) systemdDbus.Property {
- return systemdDbus.Property{
- Name: name,
- Value: dbus.MakeVariant(units),
- }
- }
- func unitName(name string) string {
- return fmt.Sprintf("%s.slice", name)
- }
- func splitName(path string) (slice string, unit string) {
- slice, unit = filepath.Split(path)
- return strings.TrimSuffix(slice, "/"), unit
- }
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