104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
// +build systemd
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package cgroups
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import (
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"fmt"
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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/dbus"
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"github.com/godbus/dbus"
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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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func Systemd() ([]Subsystem, error) {
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root, err := unifiedMountPoint()
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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 {
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return filepath.Join(slice, unitName(name))
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}
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}
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func NewSystemd(root string) (*SystemdController, error) {
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conn, err := systemdDbus.New()
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if err != nil {
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return nil, err
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}
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return &SystemdController{
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root: root,
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conn: conn,
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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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conn *systemdDbus.Conn
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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, resources *specs.LinuxResources) error {
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slice, name := splitName(path)
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properties := []systemdDbus.Property{
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systemdDbus.PropDescription(fmt.Sprintf("cgroup %s", name)),
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systemdDbus.PropWants(slice),
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newProperty("DefaultDependencies", false),
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newProperty("Delegate", true),
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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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_, err := s.conn.StartTransientUnit(name, "replace", properties, nil)
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return err
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}
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func (s *SystemdController) Delete(path string) error {
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_, name := splitName(path)
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_, err := s.conn.StopUnit(name, "replace", nil)
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return err
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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 unitName(name string) string {
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return fmt.Sprintf("%s.slice", name)
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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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