func (daemon *Daemon) initCgroupsPath(path string) error {
if path == "/" || path == "." {
return nil
}
daemon.initCgroupsPath(filepath.Dir(path))
_, root, err := cgroups.FindCgroupMountpointAndRoot("cpu")
if err != nil {
return err
}
path = filepath.Join(root, path)
sysinfo := sysinfo.New(false)
if err := os.MkdirAll(path, 0755); err != nil && !os.IsExist(err) {
return err
}
if sysinfo.CPURealtimePeriod && daemon.configStore.CPURealtimePeriod != 0 {
if err := ioutil.WriteFile(filepath.Join(path, "cpu.rt_period_us"), []byte(strconv.FormatInt(daemon.configStore.CPURealtimePeriod, 10)), 0700); err != nil {
return err
}
}
if sysinfo.CPURealtimeRuntime && daemon.configStore.CPURealtimeRuntime != 0 {
if err := ioutil.WriteFile(filepath.Join(path, "cpu.rt_runtime_us"), []byte(strconv.FormatInt(daemon.configStore.CPURealtimeRuntime, 10)), 0700); err != nil {
return err
}
}
return nil
}
func (raw *data) path(subsystem string) (string, error) {
mnt, root, err := cgroups.FindCgroupMountpointAndRoot(subsystem)
// If we didn't mount the subsystem, there is no point we make the path.
if err != nil {
return "", err
}
// If the cgroup name/path is absolute do not look relative to the cgroup of the init process.
if filepath.IsAbs(raw.cgroup) {
return filepath.Join(raw.root, filepath.Base(mnt), raw.cgroup), nil
}
parent, err := raw.parent(subsystem, mnt, root)
if err != nil {
return "", err
}
return filepath.Join(parent, raw.cgroup), nil
}
func (raw *cgroupData) path(subsystem string) (string, error) {
mnt, root, err := cgroups.FindCgroupMountpointAndRoot(subsystem)
// If we didn't mount the subsystem, there is no point we make the path.
if err != nil {
return "", err
}
// If the cgroup name/path is absolute do not look relative to the cgroup of the init process.
if filepath.IsAbs(raw.innerPath) {
// Sometimes subsystems can be mounted togethger as 'cpu,cpuacct'.
return filepath.Join(raw.root, filepath.Base(mnt), raw.innerPath), nil
}
parentPath, err := raw.parentPath(subsystem, mnt, root)
if err != nil {
return "", err
}
return filepath.Join(parentPath, raw.innerPath), nil
}
// getCgroupPath gets the file path to the "devices" subsystem of the desired cgroup.
// cgroupPath is the path in the cgroup hierarchy.
func getCgroupPath(cgroupPath string) (string, error) {
cgroupPath = libcontainerutils.CleanPath(cgroupPath)
mnt, root, err := libcontainercgroups.FindCgroupMountpointAndRoot("devices")
// If we didn't mount the subsystem, there is no point we make the path.
if err != nil {
return "", err
}
// If the cgroup name/path is absolute do not look relative to the cgroup of the init process.
if filepath.IsAbs(cgroupPath) {
// Sometimes subsystems can be mounted togethger as 'cpu,cpuacct'.
return filepath.Join(root, mnt, cgroupPath), nil
}
parentPath, err := getCgroupParentPath(mnt, root)
if err != nil {
return "", err
}
return filepath.Join(parentPath, cgroupPath), nil
}
func (daemon *Daemon) initCgroupsPath(path string) error {
if path == "/" || path == "." {
return nil
}
if daemon.configStore.CPURealtimePeriod == 0 && daemon.configStore.CPURealtimeRuntime == 0 {
return nil
}
// Recursively create cgroup to ensure that the system and all parent cgroups have values set
// for the period and runtime as this limits what the children can be set to.
daemon.initCgroupsPath(filepath.Dir(path))
_, root, err := cgroups.FindCgroupMountpointAndRoot("cpu")
if err != nil {
return err
}
path = filepath.Join(root, path)
sysinfo := sysinfo.New(true)
if sysinfo.CPURealtimePeriod && daemon.configStore.CPURealtimePeriod != 0 {
if err := os.MkdirAll(path, 0755); err != nil && !os.IsExist(err) {
return err
}
if err := ioutil.WriteFile(filepath.Join(path, "cpu.rt_period_us"), []byte(strconv.FormatInt(daemon.configStore.CPURealtimePeriod, 10)), 0700); err != nil {
return err
}
}
if sysinfo.CPURealtimeRuntime && daemon.configStore.CPURealtimeRuntime != 0 {
if err := os.MkdirAll(path, 0755); err != nil && !os.IsExist(err) {
return err
}
if err := ioutil.WriteFile(filepath.Join(path, "cpu.rt_runtime_us"), []byte(strconv.FormatInt(daemon.configStore.CPURealtimeRuntime, 10)), 0700); err != nil {
return err
}
}
return nil
}