Revert "Switch to new vendor directory layout"
This reverts commit d5742209d3.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Michael Crosby
378
vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go
generated
vendored
378
vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go
generated
vendored
@@ -1,378 +0,0 @@
|
||||
// +build linux
|
||||
|
||||
package cgroups
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"fmt"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"strconv"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"github.com/docker/go-units"
|
||||
)
|
||||
|
||||
const cgroupNamePrefix = "name="
|
||||
|
||||
// https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt
|
||||
func FindCgroupMountpoint(subsystem string) (string, error) {
|
||||
// We are not using mount.GetMounts() because it's super-inefficient,
|
||||
// parsing it directly sped up x10 times because of not using Sscanf.
|
||||
// It was one of two major performance drawbacks in container start.
|
||||
f, err := os.Open("/proc/self/mountinfo")
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
scanner := bufio.NewScanner(f)
|
||||
for scanner.Scan() {
|
||||
txt := scanner.Text()
|
||||
fields := strings.Split(txt, " ")
|
||||
for _, opt := range strings.Split(fields[len(fields)-1], ",") {
|
||||
if opt == subsystem {
|
||||
return fields[4], nil
|
||||
}
|
||||
}
|
||||
}
|
||||
if err := scanner.Err(); err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return "", NewNotFoundError(subsystem)
|
||||
}
|
||||
|
||||
func FindCgroupMountpointAndRoot(subsystem string) (string, string, error) {
|
||||
f, err := os.Open("/proc/self/mountinfo")
|
||||
if err != nil {
|
||||
return "", "", err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
scanner := bufio.NewScanner(f)
|
||||
for scanner.Scan() {
|
||||
txt := scanner.Text()
|
||||
fields := strings.Split(txt, " ")
|
||||
for _, opt := range strings.Split(fields[len(fields)-1], ",") {
|
||||
if opt == subsystem {
|
||||
return fields[4], fields[3], nil
|
||||
}
|
||||
}
|
||||
}
|
||||
if err := scanner.Err(); err != nil {
|
||||
return "", "", err
|
||||
}
|
||||
|
||||
return "", "", NewNotFoundError(subsystem)
|
||||
}
|
||||
|
||||
func FindCgroupMountpointDir() (string, error) {
|
||||
f, err := os.Open("/proc/self/mountinfo")
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
scanner := bufio.NewScanner(f)
|
||||
for scanner.Scan() {
|
||||
text := scanner.Text()
|
||||
fields := strings.Split(text, " ")
|
||||
// Safe as mountinfo encodes mountpoints with spaces as \040.
|
||||
index := strings.Index(text, " - ")
|
||||
postSeparatorFields := strings.Fields(text[index+3:])
|
||||
numPostFields := len(postSeparatorFields)
|
||||
|
||||
// This is an error as we can't detect if the mount is for "cgroup"
|
||||
if numPostFields == 0 {
|
||||
return "", fmt.Errorf("Found no fields post '-' in %q", text)
|
||||
}
|
||||
|
||||
if postSeparatorFields[0] == "cgroup" {
|
||||
// Check that the mount is properly formated.
|
||||
if numPostFields < 3 {
|
||||
return "", fmt.Errorf("Error found less than 3 fields post '-' in %q", text)
|
||||
}
|
||||
|
||||
return filepath.Dir(fields[4]), nil
|
||||
}
|
||||
}
|
||||
if err := scanner.Err(); err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return "", NewNotFoundError("cgroup")
|
||||
}
|
||||
|
||||
type Mount struct {
|
||||
Mountpoint string
|
||||
Root string
|
||||
Subsystems []string
|
||||
}
|
||||
|
||||
func (m Mount) GetThisCgroupDir(cgroups map[string]string) (string, error) {
|
||||
if len(m.Subsystems) == 0 {
|
||||
return "", fmt.Errorf("no subsystem for mount")
|
||||
}
|
||||
|
||||
return getControllerPath(m.Subsystems[0], cgroups)
|
||||
}
|
||||
|
||||
func getCgroupMountsHelper(ss map[string]bool, mi io.Reader) ([]Mount, error) {
|
||||
res := make([]Mount, 0, len(ss))
|
||||
scanner := bufio.NewScanner(mi)
|
||||
for scanner.Scan() {
|
||||
txt := scanner.Text()
|
||||
sepIdx := strings.Index(txt, " - ")
|
||||
if sepIdx == -1 {
|
||||
return nil, fmt.Errorf("invalid mountinfo format")
|
||||
}
|
||||
if txt[sepIdx+3:sepIdx+9] != "cgroup" {
|
||||
continue
|
||||
}
|
||||
fields := strings.Split(txt, " ")
|
||||
m := Mount{
|
||||
Mountpoint: fields[4],
|
||||
Root: fields[3],
|
||||
}
|
||||
for _, opt := range strings.Split(fields[len(fields)-1], ",") {
|
||||
if strings.HasPrefix(opt, cgroupNamePrefix) {
|
||||
m.Subsystems = append(m.Subsystems, opt[len(cgroupNamePrefix):])
|
||||
}
|
||||
if ss[opt] {
|
||||
m.Subsystems = append(m.Subsystems, opt)
|
||||
}
|
||||
}
|
||||
res = append(res, m)
|
||||
}
|
||||
if err := scanner.Err(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return res, nil
|
||||
}
|
||||
|
||||
func GetCgroupMounts() ([]Mount, error) {
|
||||
f, err := os.Open("/proc/self/mountinfo")
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
all, err := GetAllSubsystems()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
allMap := make(map[string]bool)
|
||||
for _, s := range all {
|
||||
allMap[s] = true
|
||||
}
|
||||
return getCgroupMountsHelper(allMap, f)
|
||||
}
|
||||
|
||||
// Returns all the cgroup subsystems supported by the kernel
|
||||
func GetAllSubsystems() ([]string, error) {
|
||||
f, err := os.Open("/proc/cgroups")
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
subsystems := []string{}
|
||||
|
||||
s := bufio.NewScanner(f)
|
||||
for s.Scan() {
|
||||
if err := s.Err(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
text := s.Text()
|
||||
if text[0] != '#' {
|
||||
parts := strings.Fields(text)
|
||||
if len(parts) >= 4 && parts[3] != "0" {
|
||||
subsystems = append(subsystems, parts[0])
|
||||
}
|
||||
}
|
||||
}
|
||||
return subsystems, nil
|
||||
}
|
||||
|
||||
// Returns the relative path to the cgroup docker is running in.
|
||||
func GetThisCgroupDir(subsystem string) (string, error) {
|
||||
cgroups, err := ParseCgroupFile("/proc/self/cgroup")
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return getControllerPath(subsystem, cgroups)
|
||||
}
|
||||
|
||||
func GetInitCgroupDir(subsystem string) (string, error) {
|
||||
|
||||
cgroups, err := ParseCgroupFile("/proc/1/cgroup")
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return getControllerPath(subsystem, cgroups)
|
||||
}
|
||||
|
||||
func readProcsFile(dir string) ([]int, error) {
|
||||
f, err := os.Open(filepath.Join(dir, "cgroup.procs"))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
var (
|
||||
s = bufio.NewScanner(f)
|
||||
out = []int{}
|
||||
)
|
||||
|
||||
for s.Scan() {
|
||||
if t := s.Text(); t != "" {
|
||||
pid, err := strconv.Atoi(t)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
out = append(out, pid)
|
||||
}
|
||||
}
|
||||
return out, nil
|
||||
}
|
||||
|
||||
func ParseCgroupFile(path string) (map[string]string, error) {
|
||||
f, err := os.Open(path)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer f.Close()
|
||||
|
||||
s := bufio.NewScanner(f)
|
||||
cgroups := make(map[string]string)
|
||||
|
||||
for s.Scan() {
|
||||
if err := s.Err(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
text := s.Text()
|
||||
parts := strings.Split(text, ":")
|
||||
|
||||
for _, subs := range strings.Split(parts[1], ",") {
|
||||
cgroups[subs] = parts[2]
|
||||
}
|
||||
}
|
||||
return cgroups, nil
|
||||
}
|
||||
|
||||
func getControllerPath(subsystem string, cgroups map[string]string) (string, error) {
|
||||
|
||||
if p, ok := cgroups[subsystem]; ok {
|
||||
return p, nil
|
||||
}
|
||||
|
||||
if p, ok := cgroups[cgroupNamePrefix+subsystem]; ok {
|
||||
return p, nil
|
||||
}
|
||||
|
||||
return "", NewNotFoundError(subsystem)
|
||||
}
|
||||
|
||||
func PathExists(path string) bool {
|
||||
if _, err := os.Stat(path); err != nil {
|
||||
return false
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func EnterPid(cgroupPaths map[string]string, pid int) error {
|
||||
for _, path := range cgroupPaths {
|
||||
if PathExists(path) {
|
||||
if err := ioutil.WriteFile(filepath.Join(path, "cgroup.procs"),
|
||||
[]byte(strconv.Itoa(pid)), 0700); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// RemovePaths iterates over the provided paths removing them.
|
||||
// We trying to remove all paths five times with increasing delay between tries.
|
||||
// If after all there are not removed cgroups - appropriate error will be
|
||||
// returned.
|
||||
func RemovePaths(paths map[string]string) (err error) {
|
||||
delay := 10 * time.Millisecond
|
||||
for i := 0; i < 5; i++ {
|
||||
if i != 0 {
|
||||
time.Sleep(delay)
|
||||
delay *= 2
|
||||
}
|
||||
for s, p := range paths {
|
||||
os.RemoveAll(p)
|
||||
// TODO: here probably should be logging
|
||||
_, err := os.Stat(p)
|
||||
// We need this strange way of checking cgroups existence because
|
||||
// RemoveAll almost always returns error, even on already removed
|
||||
// cgroups
|
||||
if os.IsNotExist(err) {
|
||||
delete(paths, s)
|
||||
}
|
||||
}
|
||||
if len(paths) == 0 {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return fmt.Errorf("Failed to remove paths: %s", paths)
|
||||
}
|
||||
|
||||
func GetHugePageSize() ([]string, error) {
|
||||
var pageSizes []string
|
||||
sizeList := []string{"B", "kB", "MB", "GB", "TB", "PB"}
|
||||
files, err := ioutil.ReadDir("/sys/kernel/mm/hugepages")
|
||||
if err != nil {
|
||||
return pageSizes, err
|
||||
}
|
||||
for _, st := range files {
|
||||
nameArray := strings.Split(st.Name(), "-")
|
||||
pageSize, err := units.RAMInBytes(nameArray[1])
|
||||
if err != nil {
|
||||
return []string{}, err
|
||||
}
|
||||
sizeString := units.CustomSize("%g%s", float64(pageSize), 1024.0, sizeList)
|
||||
pageSizes = append(pageSizes, sizeString)
|
||||
}
|
||||
|
||||
return pageSizes, nil
|
||||
}
|
||||
|
||||
// GetPids returns all pids, that were added to cgroup at path.
|
||||
func GetPids(path string) ([]int, error) {
|
||||
return readProcsFile(path)
|
||||
}
|
||||
|
||||
// GetAllPids returns all pids, that were added to cgroup at path and to all its
|
||||
// subcgroups.
|
||||
func GetAllPids(path string) ([]int, error) {
|
||||
var pids []int
|
||||
// collect pids from all sub-cgroups
|
||||
err := filepath.Walk(path, func(p string, info os.FileInfo, iErr error) error {
|
||||
dir, file := filepath.Split(p)
|
||||
if file != "cgroup.procs" {
|
||||
return nil
|
||||
}
|
||||
if iErr != nil {
|
||||
return iErr
|
||||
}
|
||||
cPids, err := readProcsFile(dir)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
pids = append(pids, cPids...)
|
||||
return nil
|
||||
})
|
||||
return pids, err
|
||||
}
|
||||
Reference in New Issue
Block a user