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package cgroups
import (
"fmt"
"io/ioutil"
"path/filepath"
"strings"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
type cpusetHandler struct{}
func cpusetCopyFileFromParent(dir, file string, cgroupv2 bool) ([]byte, error) {
if dir == cgroupRoot {
return nil, fmt.Errorf("could not find parent to initialize cpuset %s", file)
}
path := filepath.Join(dir, file)
parentPath := path
if cgroupv2 {
parentPath = fmt.Sprintf("%s.effective", parentPath)
}
data, err := ioutil.ReadFile(parentPath)
if err != nil {
return nil, errors.Wrapf(err, "open %s", path)
}
if strings.Trim(string(data), "\n") != "" {
return data, nil
}
data, err = cpusetCopyFileFromParent(filepath.Dir(dir), file, cgroupv2)
if err != nil {
return nil, err
}
if err := ioutil.WriteFile(path, data, 0o644); err != nil {
return nil, errors.Wrapf(err, "write %s", path)
}
return data, nil
}
func cpusetCopyFromParent(path string, cgroupv2 bool) error {
for _, file := range []string{"cpuset.cpus", "cpuset.mems"} {
if _, err := cpusetCopyFileFromParent(path, file, cgroupv2); err != nil {
return err
}
}
return nil
}
func getCpusetHandler() *cpusetHandler {
return &cpusetHandler{}
}
// Apply set the specified constraints
func (c *cpusetHandler) Apply(ctr *CgroupControl, res *spec.LinuxResources) error {
if res.CPU == nil {
return nil
}
return fmt.Errorf("cpuset apply not implemented yet")
}
// Create the cgroup
func (c *cpusetHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
path := filepath.Join(cgroupRoot, ctr.path)
return true, cpusetCopyFromParent(path, true)
}
created, err := ctr.createCgroupDirectory(CPUset)
if !created || err != nil {
return created, err
}
return true, cpusetCopyFromParent(ctr.getCgroupv1Path(CPUset), false)
}
// Destroy the cgroup
func (c *cpusetHandler) Destroy(ctr *CgroupControl) error {
return rmDirRecursively(ctr.getCgroupv1Path(CPUset))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *cpusetHandler) Stat(ctr *CgroupControl, m *Metrics) error {
return nil
}
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