Switch to new vendor directory layout
Fixes #113 Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>
This commit is contained in:
Marcos Lilljedahl
parent
bc6adb7e4d
commit
d5742209d3
806 changed files with 2 additions and 7 deletions
476
vendor/github.com/opencontainers/runc/libcontainer/process_linux.go
generated
vendored
Normal file
476
vendor/github.com/opencontainers/runc/libcontainer/process_linux.go
generated
vendored
Normal file
|
|
@ -0,0 +1,476 @@
|
|||
// +build linux
|
||||
|
||||
package libcontainer
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"os"
|
||||
"os/exec"
|
||||
"path/filepath"
|
||||
"strconv"
|
||||
"syscall"
|
||||
|
||||
"github.com/opencontainers/runc/libcontainer/cgroups"
|
||||
"github.com/opencontainers/runc/libcontainer/configs"
|
||||
"github.com/opencontainers/runc/libcontainer/system"
|
||||
"github.com/opencontainers/runc/libcontainer/utils"
|
||||
)
|
||||
|
||||
type parentProcess interface {
|
||||
// pid returns the pid for the running process.
|
||||
pid() int
|
||||
|
||||
// start starts the process execution.
|
||||
start() error
|
||||
|
||||
// send a SIGKILL to the process and wait for the exit.
|
||||
terminate() error
|
||||
|
||||
// wait waits on the process returning the process state.
|
||||
wait() (*os.ProcessState, error)
|
||||
|
||||
// startTime return's the process start time.
|
||||
startTime() (string, error)
|
||||
|
||||
signal(os.Signal) error
|
||||
|
||||
externalDescriptors() []string
|
||||
|
||||
setExternalDescriptors(fds []string)
|
||||
}
|
||||
|
||||
type setnsProcess struct {
|
||||
cmd *exec.Cmd
|
||||
parentPipe *os.File
|
||||
childPipe *os.File
|
||||
cgroupPaths map[string]string
|
||||
config *initConfig
|
||||
fds []string
|
||||
process *Process
|
||||
bootstrapData io.Reader
|
||||
}
|
||||
|
||||
func (p *setnsProcess) startTime() (string, error) {
|
||||
return system.GetProcessStartTime(p.pid())
|
||||
}
|
||||
|
||||
func (p *setnsProcess) signal(sig os.Signal) error {
|
||||
s, ok := sig.(syscall.Signal)
|
||||
if !ok {
|
||||
return errors.New("os: unsupported signal type")
|
||||
}
|
||||
return syscall.Kill(p.pid(), s)
|
||||
}
|
||||
|
||||
func (p *setnsProcess) start() (err error) {
|
||||
defer p.parentPipe.Close()
|
||||
err = p.cmd.Start()
|
||||
p.childPipe.Close()
|
||||
if err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
if p.bootstrapData != nil {
|
||||
if _, err := io.Copy(p.parentPipe, p.bootstrapData); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
}
|
||||
if err = p.execSetns(); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
if len(p.cgroupPaths) > 0 {
|
||||
if err := cgroups.EnterPid(p.cgroupPaths, p.pid()); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
}
|
||||
if err := utils.WriteJSON(p.parentPipe, p.config); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
// set oom_score_adj
|
||||
if err := setOomScoreAdj(p.config.Config.OomScoreAdj, p.pid()); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
|
||||
if err := syscall.Shutdown(int(p.parentPipe.Fd()), syscall.SHUT_WR); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
// wait for the child process to fully complete and receive an error message
|
||||
// if one was encoutered
|
||||
var ierr *genericError
|
||||
if err := json.NewDecoder(p.parentPipe).Decode(&ierr); err != nil && err != io.EOF {
|
||||
return newSystemError(err)
|
||||
}
|
||||
// Must be done after Shutdown so the child will exit and we can wait for it.
|
||||
if ierr != nil {
|
||||
p.wait()
|
||||
return newSystemError(ierr)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// execSetns runs the process that executes C code to perform the setns calls
|
||||
// because setns support requires the C process to fork off a child and perform the setns
|
||||
// before the go runtime boots, we wait on the process to die and receive the child's pid
|
||||
// over the provided pipe.
|
||||
func (p *setnsProcess) execSetns() error {
|
||||
status, err := p.cmd.Process.Wait()
|
||||
if err != nil {
|
||||
p.cmd.Wait()
|
||||
return newSystemError(err)
|
||||
}
|
||||
if !status.Success() {
|
||||
p.cmd.Wait()
|
||||
return newSystemError(&exec.ExitError{ProcessState: status})
|
||||
}
|
||||
var pid *pid
|
||||
if err := json.NewDecoder(p.parentPipe).Decode(&pid); err != nil {
|
||||
p.cmd.Wait()
|
||||
return newSystemError(err)
|
||||
}
|
||||
process, err := os.FindProcess(pid.Pid)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
p.cmd.Process = process
|
||||
p.process.ops = p
|
||||
return nil
|
||||
}
|
||||
|
||||
// terminate sends a SIGKILL to the forked process for the setns routine then waits to
|
||||
// avoid the process becomming a zombie.
|
||||
func (p *setnsProcess) terminate() error {
|
||||
if p.cmd.Process == nil {
|
||||
return nil
|
||||
}
|
||||
err := p.cmd.Process.Kill()
|
||||
if _, werr := p.wait(); err == nil {
|
||||
err = werr
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
func (p *setnsProcess) wait() (*os.ProcessState, error) {
|
||||
err := p.cmd.Wait()
|
||||
|
||||
// Return actual ProcessState even on Wait error
|
||||
return p.cmd.ProcessState, err
|
||||
}
|
||||
|
||||
func (p *setnsProcess) pid() int {
|
||||
return p.cmd.Process.Pid
|
||||
}
|
||||
|
||||
func (p *setnsProcess) externalDescriptors() []string {
|
||||
return p.fds
|
||||
}
|
||||
|
||||
func (p *setnsProcess) setExternalDescriptors(newFds []string) {
|
||||
p.fds = newFds
|
||||
}
|
||||
|
||||
type initProcess struct {
|
||||
cmd *exec.Cmd
|
||||
parentPipe *os.File
|
||||
childPipe *os.File
|
||||
config *initConfig
|
||||
manager cgroups.Manager
|
||||
container *linuxContainer
|
||||
fds []string
|
||||
process *Process
|
||||
bootstrapData io.Reader
|
||||
sharePidns bool
|
||||
}
|
||||
|
||||
func (p *initProcess) pid() int {
|
||||
return p.cmd.Process.Pid
|
||||
}
|
||||
|
||||
func (p *initProcess) externalDescriptors() []string {
|
||||
return p.fds
|
||||
}
|
||||
|
||||
// execSetns runs the process that executes C code to perform the setns calls
|
||||
// because setns support requires the C process to fork off a child and perform the setns
|
||||
// before the go runtime boots, we wait on the process to die and receive the child's pid
|
||||
// over the provided pipe.
|
||||
// This is called by initProcess.start function
|
||||
func (p *initProcess) execSetns() error {
|
||||
status, err := p.cmd.Process.Wait()
|
||||
if err != nil {
|
||||
p.cmd.Wait()
|
||||
return err
|
||||
}
|
||||
if !status.Success() {
|
||||
p.cmd.Wait()
|
||||
return &exec.ExitError{ProcessState: status}
|
||||
}
|
||||
var pid *pid
|
||||
if err := json.NewDecoder(p.parentPipe).Decode(&pid); err != nil {
|
||||
p.cmd.Wait()
|
||||
return err
|
||||
}
|
||||
process, err := os.FindProcess(pid.Pid)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
p.cmd.Process = process
|
||||
return nil
|
||||
}
|
||||
|
||||
func (p *initProcess) start() error {
|
||||
defer p.parentPipe.Close()
|
||||
err := p.cmd.Start()
|
||||
p.process.ops = p
|
||||
p.childPipe.Close()
|
||||
if err != nil {
|
||||
p.process.ops = nil
|
||||
return newSystemError(err)
|
||||
}
|
||||
if _, err := io.Copy(p.parentPipe, p.bootstrapData); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := p.execSetns(); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
// Save the standard descriptor names before the container process
|
||||
// can potentially move them (e.g., via dup2()). If we don't do this now,
|
||||
// we won't know at checkpoint time which file descriptor to look up.
|
||||
fds, err := getPipeFds(p.pid())
|
||||
if err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
p.setExternalDescriptors(fds)
|
||||
// Do this before syncing with child so that no children
|
||||
// can escape the cgroup
|
||||
if err := p.manager.Apply(p.pid()); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
defer func() {
|
||||
if err != nil {
|
||||
// TODO: should not be the responsibility to call here
|
||||
p.manager.Destroy()
|
||||
}
|
||||
}()
|
||||
if err := p.createNetworkInterfaces(); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
if err := p.sendConfig(); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
var (
|
||||
procSync syncT
|
||||
sentRun bool
|
||||
sentResume bool
|
||||
ierr *genericError
|
||||
)
|
||||
|
||||
dec := json.NewDecoder(p.parentPipe)
|
||||
loop:
|
||||
for {
|
||||
if err := dec.Decode(&procSync); err != nil {
|
||||
if err == io.EOF {
|
||||
break loop
|
||||
}
|
||||
return newSystemError(err)
|
||||
}
|
||||
switch procSync.Type {
|
||||
case procReady:
|
||||
if err := p.manager.Set(p.config.Config); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
// set oom_score_adj
|
||||
if err := setOomScoreAdj(p.config.Config.OomScoreAdj, p.pid()); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
// call prestart hooks
|
||||
if !p.config.Config.Namespaces.Contains(configs.NEWNS) {
|
||||
if p.config.Config.Hooks != nil {
|
||||
s := configs.HookState{
|
||||
Version: p.container.config.Version,
|
||||
ID: p.container.id,
|
||||
Pid: p.pid(),
|
||||
Root: p.config.Config.Rootfs,
|
||||
}
|
||||
for _, hook := range p.config.Config.Hooks.Prestart {
|
||||
if err := hook.Run(s); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
// Sync with child.
|
||||
if err := utils.WriteJSON(p.parentPipe, syncT{procRun}); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
sentRun = true
|
||||
case procHooks:
|
||||
if p.config.Config.Hooks != nil {
|
||||
s := configs.HookState{
|
||||
Version: p.container.config.Version,
|
||||
ID: p.container.id,
|
||||
Pid: p.pid(),
|
||||
Root: p.config.Config.Rootfs,
|
||||
}
|
||||
for _, hook := range p.config.Config.Hooks.Prestart {
|
||||
if err := hook.Run(s); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
}
|
||||
}
|
||||
// Sync with child.
|
||||
if err := utils.WriteJSON(p.parentPipe, syncT{procResume}); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
sentResume = true
|
||||
case procError:
|
||||
// wait for the child process to fully complete and receive an error message
|
||||
// if one was encoutered
|
||||
if err := dec.Decode(&ierr); err != nil && err != io.EOF {
|
||||
return newSystemError(err)
|
||||
}
|
||||
if ierr != nil {
|
||||
break loop
|
||||
}
|
||||
// Programmer error.
|
||||
panic("No error following JSON procError payload.")
|
||||
default:
|
||||
return newSystemError(fmt.Errorf("invalid JSON synchronisation payload from child"))
|
||||
}
|
||||
}
|
||||
if !sentRun {
|
||||
return newSystemError(fmt.Errorf("could not synchronise with container process"))
|
||||
}
|
||||
if p.config.Config.Namespaces.Contains(configs.NEWNS) && !sentResume {
|
||||
return newSystemError(fmt.Errorf("could not synchronise after executing prestart hooks with container process"))
|
||||
}
|
||||
if err := syscall.Shutdown(int(p.parentPipe.Fd()), syscall.SHUT_WR); err != nil {
|
||||
return newSystemError(err)
|
||||
}
|
||||
// Must be done after Shutdown so the child will exit and we can wait for it.
|
||||
if ierr != nil {
|
||||
p.wait()
|
||||
return newSystemError(ierr)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (p *initProcess) wait() (*os.ProcessState, error) {
|
||||
err := p.cmd.Wait()
|
||||
if err != nil {
|
||||
return p.cmd.ProcessState, err
|
||||
}
|
||||
// we should kill all processes in cgroup when init is died if we use host PID namespace
|
||||
if p.sharePidns {
|
||||
killCgroupProcesses(p.manager)
|
||||
}
|
||||
return p.cmd.ProcessState, nil
|
||||
}
|
||||
|
||||
func (p *initProcess) terminate() error {
|
||||
if p.cmd.Process == nil {
|
||||
return nil
|
||||
}
|
||||
err := p.cmd.Process.Kill()
|
||||
if _, werr := p.wait(); err == nil {
|
||||
err = werr
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
func (p *initProcess) startTime() (string, error) {
|
||||
return system.GetProcessStartTime(p.pid())
|
||||
}
|
||||
|
||||
func (p *initProcess) sendConfig() error {
|
||||
// send the config to the container's init process, we don't use JSON Encode
|
||||
// here because there might be a problem in JSON decoder in some cases, see:
|
||||
// https://github.com/docker/docker/issues/14203#issuecomment-174177790
|
||||
return utils.WriteJSON(p.parentPipe, p.config)
|
||||
}
|
||||
|
||||
func (p *initProcess) createNetworkInterfaces() error {
|
||||
for _, config := range p.config.Config.Networks {
|
||||
strategy, err := getStrategy(config.Type)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
n := &network{
|
||||
Network: *config,
|
||||
}
|
||||
if err := strategy.create(n, p.pid()); err != nil {
|
||||
return err
|
||||
}
|
||||
p.config.Networks = append(p.config.Networks, n)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (p *initProcess) signal(sig os.Signal) error {
|
||||
s, ok := sig.(syscall.Signal)
|
||||
if !ok {
|
||||
return errors.New("os: unsupported signal type")
|
||||
}
|
||||
return syscall.Kill(p.pid(), s)
|
||||
}
|
||||
|
||||
func (p *initProcess) setExternalDescriptors(newFds []string) {
|
||||
p.fds = newFds
|
||||
}
|
||||
|
||||
func getPipeFds(pid int) ([]string, error) {
|
||||
fds := make([]string, 3)
|
||||
|
||||
dirPath := filepath.Join("/proc", strconv.Itoa(pid), "/fd")
|
||||
for i := 0; i < 3; i++ {
|
||||
f := filepath.Join(dirPath, strconv.Itoa(i))
|
||||
target, err := os.Readlink(f)
|
||||
if err != nil {
|
||||
return fds, err
|
||||
}
|
||||
fds[i] = target
|
||||
}
|
||||
return fds, nil
|
||||
}
|
||||
|
||||
// InitializeIO creates pipes for use with the process's STDIO
|
||||
// and returns the opposite side for each
|
||||
func (p *Process) InitializeIO(rootuid int) (i *IO, err error) {
|
||||
var fds []uintptr
|
||||
i = &IO{}
|
||||
// cleanup in case of an error
|
||||
defer func() {
|
||||
if err != nil {
|
||||
for _, fd := range fds {
|
||||
syscall.Close(int(fd))
|
||||
}
|
||||
}
|
||||
}()
|
||||
// STDIN
|
||||
r, w, err := os.Pipe()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fds = append(fds, r.Fd(), w.Fd())
|
||||
p.Stdin, i.Stdin = r, w
|
||||
// STDOUT
|
||||
if r, w, err = os.Pipe(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fds = append(fds, r.Fd(), w.Fd())
|
||||
p.Stdout, i.Stdout = w, r
|
||||
// STDERR
|
||||
if r, w, err = os.Pipe(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fds = append(fds, r.Fd(), w.Fd())
|
||||
p.Stderr, i.Stderr = w, r
|
||||
// change ownership of the pipes incase we are in a user namespace
|
||||
for _, fd := range fds {
|
||||
if err := syscall.Fchown(int(fd), rootuid, rootuid); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
return i, nil
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue