103 lines
2.2 KiB
Go
103 lines
2.2 KiB
Go
// +build systemd
|
|
|
|
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 := unifiedMountPoint()
|
|
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 {
|
|
return filepath.Join(slice, unitName(name))
|
|
}
|
|
}
|
|
|
|
func NewSystemd(root string) (*SystemdController, error) {
|
|
conn, err := systemdDbus.New()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &SystemdController{
|
|
root: root,
|
|
conn: conn,
|
|
}, nil
|
|
}
|
|
|
|
type SystemdController struct {
|
|
mu sync.Mutex
|
|
conn *systemdDbus.Conn
|
|
root string
|
|
}
|
|
|
|
func (s *SystemdController) Name() Name {
|
|
return SystemdDbus
|
|
}
|
|
|
|
func (s *SystemdController) Create(path string, resources *specs.LinuxResources) error {
|
|
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),
|
|
}
|
|
_, err := s.conn.StartTransientUnit(name, "replace", properties, nil)
|
|
return err
|
|
}
|
|
|
|
func (s *SystemdController) Delete(path string) error {
|
|
_, name := splitName(path)
|
|
_, err := s.conn.StopUnit(name, "replace", nil)
|
|
return err
|
|
}
|
|
|
|
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
|
|
}
|