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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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